Bettis Installation Operation Double Acting Manuals & Guides

Installation, Operation and Maintenance Manual

GVO-LP-DA Linear Valve Operator

E-90090001 Rev. A

May 2014

Installation, Operation and Maintenance Manual

E-90090001 Rev A

Table of Contents

Section 1: Safety Warning

Section 2: Introduction

2.1 General Service Information .......................................................................... 2

2.2 Denition of Terms ........................................................................................ 2

2.3 Scope ........................................................................................................... 3

2.4 Model Identication ...................................................................................... 3

Section 3: Storage Instructions

Section 4: Operation

Table of Contents

May 2014

Section 5: Preparation

Section 6: Installation

6.1 Notes .......................................................................................................... 10

6.2 Lifting ......................................................................................................... 11

6.3 Procedures of Installation ............................................................................ 12

Section 7: Maintenance

7.1 Regular Maintenance .................................................................................. 15

7.2 Disassembly ................................................................................................ 15

7.3 Inspection and Cleaning .............................................................................. 17

7.4 Reassembly ................................................................................................. 18

Section 8: Operator End Stop Adjustment

8.1 End Stop Adjustment Conditions ................................................................. 21

Section 9: Testing and Troubleshooting

9.1 Testing ........................................................................................................ 23

9.2 Troubleshooting .......................................................................................... 23

Section 10: Document Revision

Table of Contents

Appendix A: List of Tables

Appendix B: List of Figures

I

Section 1: Safety Warning

May 2014

Installation, Operation and Maintenance Manual

Section 1: Safety Warning

All personnel involved should read and understand all applicable sections of this manual
before attempting to install, operate, service or perform maintenance on any operators.
Adhere to any tags, warning labels or instructions present on the operator.

These may provide information more specic and signicant regarding the operator than

this general manual can.

It is the responsibility of the user to ensure proper safety, always take necessary
precautions and utilize proper personal protective equipment when dealing with

compressed air, compressed hydraulic uid, pinch points and electricity.

It is necessary to rig and lift valve and operator separately. Service personnel need to
ensure the lifting capacity of the crane/hoist/rigging is appropriate for the desired load.

Before attempting to install or service, block power gas supply and depressurize system.
Isolate the power gas from controls if operator is supplied with control system.

In most applications, caustic gases and uids may be contained in the operators and valves.
In order to prevent personnel injury, all poisonous or ammable gases must be vented and

all liquids have to be stored in a safe location. Discharge at sonic velocity may occur when
venting or releasing pressure; service personnel must utilize proper hearing protection.

E-90090001 Rev A

The following are general instructions since there are variations of linear operators and valves.
It is critical to install the operator properly so that performance and safety are guaranteed.
Any technicians using the following instructions must be trained and knowledgeable regarding
valve operators and valves.

CAUTION: DISASSEMBLE OPERATOR CAREFULLY

It is required to go through the above instructions which will help to prevent personnel
injury, property damage and damage to operator.

Please refer to the applicable section for details and further information.

1

Safety Warning

Installation, Operation and Maintenance Manual

E-90090001 Rev A

Section 2: Introduction

2.1 General Service Information

This Installation, Operation and Maintenance (IOM) manual is for GVO Series Pneumatic
Double Acting Linear Valve Operators. Failure to comply with installation, operation and
maintenance instructions will void the warranty and may result in severe injury and/or
property damage.

2.2 Definition of Terms

The abbreviations included in this IOM manual are listed in the table below:

Table 1. Definition of Terms

Section 2: Introduction

May 2014

Abbreviated
Ter m

IOM Installation, Operation and Maintenance
GVO Gate Valve Operator Series
LP Low Pressure Pneumatic
DA Double Acting
TDM Tandem Power Cylinder
ID Inside Diameter [inch]
OD Outside Diameter [inch]
BCD Bolt Circle Diameter
MOT Maximum Operator Travel
MVT Maximum Valve Stem Travel
MAWP Maximum Allowable Working Pressure

Definition

WARNING

If not observed, user incurs a high risk of severe damage to operator and/or fatal injury to
personnel.

CAUTION

If not observed, user may incur damage to operator and/or injury to personnel.

Introduction

NOTE:

Advisory and information comments provided to assist maintenance personnel to carry out
maintenance procedures.

2

Section 2: Introduction

May 2014

2.3 Scope

This manual is a resource for technicians involved in the installation, operation and maintenance
of Bettis™ Gate Valve Operator (GVO) Series Pneumatic Linear Valve Operators. It serves as a
guide and must be thoroughly understood prior to any work on the operators such as
installation, operation or maintenance. For any questions, please contact the manufacturer.

2.4 Model Identification

The Bettis GVO Pneumatic Series represents a broad range of eld-proven linear valve

operators suitable for automating most types of rising stem valves in safety shutdown and
control applications. Figure 1 shows the typical assembly drawing of GVO-LP-DA operator
with an open pedestal with the key terminology. For a full listing of items, refer to the typical
sectional assembly drawing Figure 7. GVO-LP-DA with Open Pedestal.

Figure 1 Typical Assembly of GVO-LP-DA on Valve

Installation, Operation and Maintenance Manual

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3

Introduction

Installation, Operation and Maintenance Manual

E-90090001 Rev A

The catalog lists standard models intended to cover a wide range of sizes and applications.
Customers can use Figure 2. Linear Valve Operator Model Designation to identify the key
operator characteristics. If not included in the catalog lists, custom designed models are
also available for specialized thrust or stroke requirements or those beyond the scope of
this listing, including linear hydraulic operated operators.

Figure 2 Linear Valve Operator Model Designation

Section 2: Introduction

May 2014

To illustrate, a model number of 16x10x2.50-GVO-LP-DA-MH is an operator with a 16 [inch]
inside diameter cylinder (17), a 10 [inch] maximum stroke (adjustable down to 8 [inch]
stroke), a 2.5 [inch] OD drive rod (1) and is low-pressure pneumatic double acting with a

manual hydraulic override. Operators will also be identied with an individual serial number.

Figure 3. Linear Valve Operator Serial Number shows the form of the Bettis serial number.

Figure 3 Linear Valve Operator Serial Number

For example, a serial number of 00-123456-2.1 represents the rst unit on the second line

of sales order 123456.

Introduction

4

Sections 3: Storage Instructions

May 2014

Installation, Operation and Maintenance Manual

Section 3: Storage Instructions

Proper storage of the operator is required when the operator will not be put into
immediate service.

1. Remove all dirt, dust, grease and contaminants from the exposed drive rod (1)
surface by using a soft cloth dampened with an appropriate oil-based solvent.
Avoid using abrasive material when cleaning rod surfaces.

2. Retract the drive rod (1) into the operator by applying the air supply/Nitrogen
to the port(s) on the cylinder plate (4). Lightly grease portion of drive rod that
remains exposed.

3. The plastic plugs used to plug the pressure ports during assembly should be
removed and replaced with steel plugs. Any controls present should also be
plugged with steel plugs.

NOTE:

A sealant such as pipe dope or Teon tape should be applied to steel plug threads.

E-90090001 Rev A

4. Lightly lubricate all exposed threads and unpainted surfaces
(e.g. bottom of pedestal plate)

5. Cover the operator to prevent accumulation of dirt and debris.

6. In case the operator will be moved and stored again, the storage steps listed above
must be repeated to ensure the proper storage condition.

An indoor environment is the ideal storage condition for the operator.
For additional information on storage, please contact the manufacturer.

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Storage Instructions

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E-90090001 Rev A

Section 4: Operation

The Double Acting operator functions when supply pressure is applied to the piston (11).
To extend the drive rod (1), pressure is applied through ports on the end cap (8) to exert force
on the cap side of the piston (11), pushing the drive rod (1) out of the operator.
To retract the drive rod (1), pressure is applied through ports on the cylinder plate (4) to exert
force on the drive rod side of the piston (11), pulling the drive rod (1) into the operator.
This will push in or pull out the connected valve stem. Upon loss of supply pressure, the
operator will stop wherever it is in its travel position. It has no predetermined failed position
unless there are some control components to command such a position.

Sections 4: Operation

May 2014

Operation

6

Section 5: Preparation

May 2014

Section 5: Preparation

Before beginning to work (installation, operation or maintenance) on an operator, please
be sure to read through all the applicable sections of the manual to ensure that you are
familiar with the expected sequence of events.

5.1 Tools

Listed are the recommended tools and materials that may be required when working on the
operator. Depending upon specic operator/task, additional tools and materials may be
required.

• Vernier/measurement ruler

• A set of SAE combination wrenches and sockets

• A set of SAE hex keys

• Strap or pipe wrench, small to medium sizes

• Large size ring wrench/hammer wrench

• Torque wrench with suitable rating

• Lifting device or a crane, complete with slings, a pair of shackles or clevises

• Air supply or nitrogen not exceeding the MAWP of the operator

• Block and bleed test valve assembly for air supply/Nitrogen

• Anti-seize (lubricant) compound

• Pipe thread sealant (e.g., Teon tape, pipe dope)

• Commercial solvent (e.g., Varsol)

Installation, Operation and Maintenance Manual

E-90090001 Rev A

5.2 Pre-Installation Verification

NOTE:

GVO linear operators shipped mounted to valves have their travel adjusted properly by the
manufacturer and do not require further adjustment. Install valve with GVO linear opera­tor directly in line. GVO linear operators shipped without a valve have their travel adjusted
based on the valve topworks (if available). Verify and ne-tune (if needed) the travel adjust­ment when installing operator on the valve.

Before initial installation of the operator on the valve, there are several critical measurements
and markings to make. These measurements and markings cannot be made after the operator
is installed and are helpful for checking or adjusting travel. Please refer to Figure 4.
Measurement of Travel Adjustment for Valve and Operator when making measurements.

NOTE:

Marks should be made with a marker, wax pen, or other tool that will not damage the seal­ing surfaces of the operator.

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Preparation

Installation, Operation and Maintenance Manual

E-90090001 Rev A

Figure 4 Measurement of Travel Adjustment for Valve and Operator

Section 5: Preparation

May 2014

Preparation

8

Section 5: Preparation

May 2014

1. Drive the valve stem fully into the valve body, ensuring that it is fully retracted

2. Actuate the operator to fully extend the drive rod (1). Mark on the swivel connector

3. Pull the valve stem fully out of the valve body, ensuring that it is fully extended.

4. Actuate the operator to fully retract the drive rod (1). Mark on the drive rod (1)

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(consult valve manufacturer for procedure if required). If so equipped, remove valve
lever, handwheel, gear and/or jam nut/stop nut per valve-manufacturer instructions.
Use a soft mallet if striking the valve stem's threaded end to retract valve stem fully.
Mark on the valve stem where it and the top of the valve ange align.
This is "MARK #1".

Using the Vernier/measurement ruler, measure from the top of the valve ange to

the end of the valve stem. Record this value as "A".

A = ___________

(80) the distance "A" up from the bottom of the adapter plate. This is "MARK #2".

Using the Vernier/measurement ruler, measure from the mark to the bottom of
the stem nut. Record this value as "B".

B = ___________
Also measure from the top of the body of the swivel connector (80) to the bottom
of the cylinder plate (4). Record this value as "X".

X = ___________

Mark on the valve stem a distance "B" down from the top of the valve stem.
This is "MARK #3".

Using the Vernier/measurement ruler, measure from the top of the valve ange to

the top of the valve stem. Record this value as "Y".

Y = ___________

where it and the bottom of the cylinder plate (4) align (do not damage the drive
rod's OD sealing surface). This is "MARK #4".

Using the Vernier/measurement ruler, measure from the top of the body of the
swivel connector (80) to the bottom of the cylinder plate (4). Record value "Z".

Z = ___________

CHECK: Perform the below calculations:

Y - A = Maximum Valve Stem Travel (MVT) = ___________

X - Z = Maximum Operator Travel (MOT) = ___________

If maximum operator travel (MOT) is less than or equal to maximum valve stem travel (MVT),

that means end stop (32) is factory set properly. Further verication is required during the

valve installation.

If MOT is larger than MVT, refer to SECTION 8. (OPERATOR END STOP ADJUSTMENT) for
details on how to adjust the operator travel stop during valve installation.

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Preparation

Installation, Operation and Maintenance Manual

E-90090001 Rev A

Section 6: Installation

6.1 Notes

CAUTION: PINCH POINTS AROUND CONNECTOR

The areas inside the pedestal around the connector are PINCH POINTS for hands and ngers.

CAUTION: REMOVE LINE PRESSURE

Line pressure can cause a valve to open or close unexpectedly. It is recommended for the
installation to be performed on the valve with no pressure in the line.

• GVO linear operators shipped mounted to valves have their travel adjusted prop-

erly by the manufacturer and do not require further adjustment. Install valve with
GVO linear operator directly in line.

• If the valve is not shipped with the operator, the valve might need to be prepared

for installation. Any device that would restrict the free movement of the valve
stem or prevent installation of the operator (e.g., handwheel or stem nut) must be
removed. Consult valve manufacture for instructions.

• When connecting to supply, be sure to use internally clean pipe or tubing, and as-

sure appropriate pressure and ow capacity for the operator. Clean, dry supply gas

will help to ensure trouble-free operation.

• Before beginning installation check valve and operator for compatibility. Verify

connector thread matches valve stem. Verify operator mounting plate/valve gear
ange connection (e.g. bolt pattern, and alignment bosses). Verify mounting hard­ware bolts, studs, lock washers, etc. are the proper amounts, lengths, and sizes.

• Ensure threads and mating surfaces are free of dirt and debris.

Section 6: Installation

May 2014

Installation

10

Section 6: Installation

May 2014

6.2 Lifting

CAUTION: USE PROPER LIFTING EQUIPMENT

The operator's built-in lifting lugs/eyes are designed with the capacity to lift the GVO
operator and the pedestal. Additional lifting support is required to lift the operator with
a valve attached. Always use an appropriately rated crane/hoist and appropriate straps/
chains when raising and lowering the operator.

VERTICAL LIFTING:
Before lifting the operator, make sure that the valve has been disconnected from the
operator. When handling and installing the operator, care must be taken, especially when
rigging and lifting the operator. The operator should only be lifted from the lifting lugs
located on the end cap, shown in Figure 5. Lifting Method.

NOTE:

Operators should be lifted with force acting as vertically as possible. Spreader bars or other
lifting aids may be required to maintain a vertical lift on the lugs or eyebolts. Always lift the
operator with a 60° or greater lifting angle measured from the horizontal plane.

Installation, Operation and Maintenance Manual

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Figure 5 Lifting Method

11

Installation

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6.3 Procedures of Installation

6.3.1 Operator Installation

1. Removal of the window(s) from the operator pedestal is required to provide
access to the connector on closed pedestal operators.

2. Complete measurements in section 5.2 Pre-installation Verication to aid in
assembly of operator to valve and ensure that the end stop is set properly.

3. Disconnect the tubing if applicable, and connect the air supply/Nitrogen
(a block and bleed valve can be used to maintain pressure in the cylinder locking
the drive rod in position). Do not exceed operator MAWP.

4. While extending the drive rod (1), a controlled stroking speed can be used to
travel the operator while screwing/rotating the stem nut section of the connector
onto the valve stem.

6.3.1.1 Operator Installation Conditions:
a. Condition A. Valve Stem Extended/Operator Drive Rod Retracted

b. Condition B. Valve Stem Retracted/Operator Drive Rod Extended

Section 6: Installation

May 2014

CAUTION: CAREFULLY HANDLE VALVE STEM AND NUT

Jamming the stem nut into the top of the valve stem may damage the threads; if damage
occurs repair is required before attempting to screw the stem nut onto the valve stem.

Side loading of the valve stem while lowering the operator onto the valve can cause
damage to the valve or operator. Ensure rigging will allow sufcient control of the
location and speed at which the operator is lowered onto the valve.

LEFT HAND ROTATION of the stem nut is most common. Determine thread rotation before
attempting to screw the stem nut sections onto the valve stem.

Condition A: Valve Stem Extended/Operator Drive Rod Retracted

Method 1:

1. Apply anti-seize to valve stem thread.

2. With the operator's drive rod (1) fully retracted, lower the operator until the
swivel connector (80) contacts the valve stem.

3. Continue to lower the operator as you spin/rotate the operator about the
valve stem to engage the stem nut onto the valve stem. Measurement “B”

taken in section 5.2 Pre-installation Verication will provide the required

engagement of the stem nut onto the valve stem.

Installation

NOTE:

The stem nut may have to be held/restrained by a vise grip/pipe wrench inside the pedes­tal so it will rotate with the operator. The valve stem may not remain in the fully extended
position due to the weight of the operator. Threading the swivel connector (80) onto the
valve stem will bring the valve stem back to the fully extended position.

12

Section 6: Installation

May 2014

Method 2:

NOTE:

The following Method 2 may be used if it is possible to get a hand/wrench into the pedestal
(if so equipped) to turn the stem nut section onto the valve stem. If this is not possible,
then use Method 1 above.

Installation, Operation and Maintenance Manual

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4. Once full engagement is achieved advance the stem nut a half turn (pushing
stem nut down) to ensure operator stroke is controlled by internal stop of
operator and is not limited by valve stroke.

5. At the point the adapter plate is in full contact with the valve gear ange, position
the controls and windows to the required location and install mounting hardware.

6. Slowly extend the drive rod when it is fully extended and verify the connector can

rotate a few degrees. This conrms the valve travel is controlled by the internal

stop of the operator and operator is not jamming the gate in the valve body.

7. If operator end stop needs adjustment please refer to SECTION 8. OPERATOR
END STOP ADJUSTMENT.

8. Once operator travel is conrmed, the set screws (98) can be tightened in the
connector assembly locking into position.

1. Apply anti-seize to valve stem thread.

2. Guide and lower the operator over the valve stem until the stem nut section is
about one inch away.

3. Holding the operator in position slowly extend the drive rod (1) until the stem
nut makes contact with the valve stem.

4. Lower the operator while simultaneously retracting the drive rod (1) as you
thread the connector onto the valve stem. Continue this process until contact

is made between the adapter plate and the valve gear ange.

NOTE:

The valve stem may not remain in the fully extended position due to the weight of the
operator. Threading the connector onto the valve stem will bring the valve stem back
to the fully extended position.

5. Check against Measurement “B” taken in section 5.2 Pre-installation

Verication for the required engagement of the stem nut onto the valve stem.

6. Once full engagement is achieved advance the stem nut a half turn to ensure
operator stroke is controlled by internal stop of operator and is not limited by
valve stroke.

7. When the pedestal plate and the valve gear ange are in contact, make sure
the control assembly/plate is oriented in the required position.
Then install the mounting hardware.

8. Slowly extend the drive rod when it is fully extended and verify the connector can

rotate a few degrees. This conrms the valve travel is controlled by the internal

stop of the operator and operator is not jamming the gate in the valve body.

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Installation

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9. Once operator travel is conrmed the set screws (98) can be tightened in the
connector assembly locking into position.

Condition B: Valve Stem Retracted/Operator Drive Rod Extended

Method 1:

1. Apply anti-seize to valve stem thread.

2. Spin/rotate the operator around the valve stem to engage the valve stem in
the stem nut while slowly lowering the operator. The stem nut may have to
be retained to the operator by a vise grip or pipe wrench.

3. Measurement “B” taken in section 5.2 Pre-installation Verication will provide
the required engagement of the stem nut onto the valve stem. Once full
engagement is achieved advance the stem nut a half a turn to ensure opera­tor stroke is controlled by internal stop of operator and is not limited by valve
stroke.

4. Once full contact is made between the adapter plate and gear ange, posi-
tion the control/windows as required. Install mounting bolts and tie rods.

5. Slowly retract the drive rod, when it is fully retracted verify the connector can

rotate a few degrees. This conrms the valve travel is controlled by the end

stop of the operator and operator is not jamming the gate in the valve body.

6. Once operator travel is conrmed the set screws (98) can be tightened in the
connector assembly locking into position.

Section 6: Installation

May 2014

Method 2:

NOTE:

The following Method 2 may be used if it is possible to get a hand/wrench into the pedestal
(if so equipped) to turn the stem nut section onto the valve stem. If this is not possible, then
use Method 1 above.

1. Apply anti-seize to valve stem thread.

2. Lower the operator onto the valve until the valve stem contacts the stem nut
section of the connector.

3. While slowly lowering the operator screw/rotate the stem nut section to
engage it onto the valve stem until the adapter plate fully contacts the gear

ange.

4. Measurement “B” taken in section 5.2 Pre-installation Verication will provide
the required engagement of the stem nut onto the valve stem. Once full
engagement is achieved, advance the stem nut a half a turn to ensure opera­tor stroke is controlled by internal stop of operator and is not limited by valve
stroke.

5. Slowly retract the drive rod, when it is fully retracted verify the connector can

rotate a few degrees. This conrms the valve travel is controlled by the end

stop of the operator and operator is not jamming the gate in the valve body.

6. Once operator travel is conrmed the set screws (98) can be tightened in the
connector assembly locking into position.

Installation

14

Section 7: Maintenance

May 2014

Section 7: Maintenance

7.1 Regular Maintenance

• If possible, remove line pressure prior to any maintenance.

• Under normal operating conditions, the only servicing required is seal and gasket

replacement.

• In addition to the standard recommended tools and materials (5.1 Tools),

the following tools and materials are recommended for maintenance:

— Dow corning #111 grease or equivalent

— A tube of sealant (e.g., silicone)

— Leak detecting uid (e.g., soapy water)

• Seals, gaskets and other applicable soft parts are available from the manufacturer

as repair kits. Lubricant, sealant and/or other materials are also available from the
manufacturer.

Installation, Operation and Maintenance Manual

E-90090001 Rev A

NOTE:

This product is only intended for use in large-scale xed installations excluded from the

scope of Directive 2011/65/EU on the restriction of the use of certain hazardous substances
in electrical and electronic equipment (RoHS 2).

7.2 Disassembly

NOTE:

Refer to this section only when seals need to be replaced. Refer to SECTION 9.
TESTING AND TROUBLESHOOTING to determine when seals need to be replaced.

All parts described below are indicated by a corresponding number in parenthesis. Please

refer to Figure 7. GVO-LP-DA with Open Pedestal to identify the specied components.

The parts cited are typical to linear operators. A special operator might have different parts
which should be installed in the same manner as they are removed.

Please follow the steps below for DA Operators:

1. Actuate the operator by applying the pressure through the cylinder plate
ports to fully retract the drive rod (1). Refer to Figure 6. Markings for Mainte­nance and mark the following locations:

a. On the drive rod (1), mark where the bottom of the cylinder plate (4) falls.

This is "MARK A" which is current operator stroke (operator stop setting).

b. On the valve stem, mark the bottom of the stem nut. This is "MARK B"

which is the existing valve stem engagement.

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Maintenance

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NOTE:

"MARK A" and "MARK B" is to facilitate re-assembly to match original valve/operator setting.
Marks should be made with a marker, wax pen, or other tool that will not damage the sealing
surfaces of the operator.

Figure 6 Markings for Maintenance

Section 7: Maintenance

May 2014

Maintenance

2. Now, remove pressure from the operator and/or systems.

3. Mark or note the port and tubing locations to facilitate reassembly.

4. Disconnect all tubing from the operator.

5. Loosen set screw (97), (98), and (99) in swivel connector (80).

6. Unthread the stem nut from the valve stem and unthread the swivel connector
(80) from the drive rod (1). This will allow the drive rod and piston to be removed
completely from the operator.

16

Section 7: Maintenance

May 2014

NOTE:

Leave end stop installed in end cap if possible to maintain correct operator travel for
reinstalling on the valve. If you must remove the end stop make a mark to aid in reassembly.

Installation, Operation and Maintenance Manual

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7. Remove end stop cover (33) and end stop cover seal (57) from the top end cap (8).

8. Remove stay rod nuts (91), lift lugs (35), end cap (8), upper cylinder gasket
(46) and/or upper cylinder seal (if supplied).

9. Remove only enough stay rods (23) to allow access for removal of the cylinder
(17) and piston (11).

10. Remove cylinder (17) from the operator. When removing the cylinder, ensure
the cylinder is not tilted and the inside surface of the cylinder is not rubbing
against the piston.

11. Remove the piston (11) with the drive rod (1) attached to it. Ensure that the
drive rod (1) is not rubbing against the cylinder plate (4) when removing it.

12. Remove drive rod hex nut/jacknut (90), piston (11), piston seal (47), piston
wear ring (42) and piston center seal (52). When removing a hex nut, be sure

to x the drive rod by clamping the at surface at its bottom securely with

some mechanical means (e.g., bench vise) to prevent the drive rod turn-

ing with the nut. When removing a jacknut, rst remove all jackscrews then

unthread the jacknut.

13. Remove lower cylinder gasket (46). Lower cylinder seal (if applicable), drive
rod guide (40), drive rod seal (51) and wiper (44) from cylinder plate (4).

NOTE:

Operator seal can be replaced with pedestal and cylinder plate (4) remained on the valve.

7.3 Inspection and Cleaning

All parts indicated are noted in Figure 7. GVO-LP-DA with Open Pedestal. Before starting
the reassembly process, perform the following:

• Thoroughly clean all parts except gaskets with Varsol or equivalent.

• Inspect all parts, checking in particular any parts or features on parts that seal or

rub against another part.

— Check internal surface of the cylinder (17) for scoring, scratches or other

wear.

— Check all metal parts for wear, corrosion and physical damage.

• Ensure cleaned parts are covered if stored outside

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Maintenance

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7.4 Reassembly

NOTE:

Reassemble the unit in the reverse order of disassembly refers to SECTION 7.2
(Disassembly). Be careful to reassemble parts in the same orientation as before.
Extra attention should be paid to the following:
Make sure all operator component parts are cleaned and lubricated (if required) prior to
installing seals

• ATTENTION: Be sure to use only new replacement seals (available as an operator-

specic kit from Emerson).

• Lubricate seals, rods and cylinder bore with a generous amount of the recom-

mended grease.

• Lubricate bushing and guides with a light coating of the recommended grease.

• When installing the drive rod (1) & piston (11) to the cylinder plate (4), make sure

to apply recommended grease/lubricant to the sealing surfaces and around cylin­der plate (4) opening. Please exercise with care to avoid rubbing against the bore
on cylinder plate.

• Lock piston (11) and drive rod (1) into position by installing either a hex nut or a

jacknut (90). Apply thread locking adhesive (e.g., Loctite) to thread(s) of hex nut
or jackscrews.

a. If using a hex nut, be sure to x the drive rod by clamping the at surface

at its bottom securely with some mechanical means. Torque per specica­tions listed in Table 2. Specication of Piston Hex Nut Tightening Torque.

Section 7: Maintenance

May 2014

Table 2. Specification of Piston Hex Nut Tightening Torque

Heavy Hex Nut Size

[-]

1/2 NC 50
5/8 NC 90
3/4 NC 160
7/8 NC 240

1 - 8UN 370
1-1/4 - 8UN 800
1-1/2 - 8UN 1500
1-3/4 - 8UN 2400

Tightening Torque

[ft-lb]

b. If using a jacknut, install nut hand tight. Then install jackscrews in a diago-

nal pattern and torque per specications listed in Table 3. Specication of

Jackscrew in Jacknut Tightening Torque.

Maintenance

18

Section 7: Maintenance

May 2014

Table 3. Specification of Jackscrew in Jacknut Tightening Torque

Installation, Operation and Maintenance Manual

E-90090001 Rev A

Jackscrew Size

[-]

1/2 NC 100
5/8 NC 185
3/4 NC 300
7/8 NC 450

Tightening Torque

[ft-lb]

• When installing the cylinder (17), grease (with recommended grease/lubricant)

the cylinder internal surface prior to install over piston (11). Make sure to install
the gasket prior to lowering the cylinder onto the cylinder plate. Ensure that the
cylinder end is seated properly on cylinder plate (4). Be careful not to damage the
piston seal when passing over the piston (11) (try to maintain as vertical as
possible when lowering down the cylinder).

• When installing the end cap (8), make sure to install the gasket beforehand, apply

grease to the gasket to aid in maintaining the gasket position while lowering the
end cap (8) to position. Make sure gasket is seated properly on the cylinder during
the installation of stay rods .

• Apply anti-seize compound on the threads of stay rod (23) detached. Install stay

rods (23) into cylinder plate (4). Tighten stay rod nuts (91) evenly, progressing
from nut to nut diagonally, not to adjacent nuts, until all nuts are torqued. Table 4.

Specication of Stay Rod Nut Tightening Torque provides the required tightening

torques for the stay rod nuts (91).

Table 4. Specification of Stay Rod Nut Tightening Torque

Stay Rod Nut Size

[-]

3/8 NC 22
1/2 NC 40
5/8 NC 80
3/4 NC 120
7/8 NC 160

1 NC 240
1-1/8 – 8 UN 385
1-1/4 – 8 UN 540
1-3/8 – 8 UN 725

Tightening Torque

[ft-lb]

CAUTION: PROPERLY TIGHTEN STAY ROD NUTS

While tightening stay rod nuts (91), ensure that grooves on cylinder plate (4) and end cap
(8) are lining-up and seating properly with ends of cylinder (17).

19

Maintenance

Installation, Operation and Maintenance Manual

E-90090001 Rev A

• Apply anti-seize to threads and install swivel connector assembly (80) onto drive

rod (1). Ensure that the top of the connector body ts tight against the shoulder

on the drive rod (1) and it cannot be threaded any farther. Secure connector body
with hex socket setscrews (97).

• Refer to SECTION 8. (OPERATOR END STOP ADJUSTMENT) for operator stop adjust-

ment (if needed) and verify operator travel and valve stem engagement refer to

SECTION 5.2 (Preinstallation Verication).

NOTE:

Apply anti-seize and thread stem nut onto valve stem to "MARK B"
(made in SECTION 5.2 Preinstallation Verication).

Secure stem nut with two hex socket set screws (98).

Check operator travel by slowly moving the operator to fully retract drive rod (1).

a. Verify that "MARK A" (outlined in disassembly) aligns with the

bottom of the cylinder plate (4) and;

b. Verify that "MARK B" aligns with the top of the pedestal plate.

If both 'a' and 'b' above are true, this indicates that the adjustment of the travel was not
disturbed during maintenance.

Section 7: Maintenance

May 2014

NOTE:

Perform leak tests upon initial reapplication of supply pressure. Leak test should be
performed with a minimum of (1.2 x Maximum Operator Pressure). With pressure applied

to the operator, apply soapy water or another leak indicating uid to gaskets (46) and end

stop cap (33). Monitor for leaks at a minimum of 10 [minutes]. A leak at the gaskets (46)

may indicate that stay rod nuts (91) must be retightened (refer to Table 4. Specication of

Stay Rod Nut Tightening Torque) or gaskets/seals need to be replaced.

Maintenance

20

Section 8: Operator End Stop Adjustment

May 2014

Installation, Operation and Maintenance Manual

E-90090001 Rev A

Section 8: Operator End Stop Adjustment

NOTE:

GVO linear operators are shipped with their travel adjusted based on the valve topworks (if

available). Adjustment may require if the preinstallation verication (SECTION 5.2) indicate

MOT is larger than MVT.

Typically, valve with operator should have its travel limited by operator stops in order to
avoid/prevent any damage to the valve; preference is MVT is 1/8 inch more than MOT. Refer
to 8.1 End Stop Adjustment Conditions if adjustment is needed.

If the end stop is out of adjustment, the operator will fall into one of two conditions (with
the assumption that valve stem engagement is according to 5.2
(Preinstallation Verication) measurement “B” plus 0.5 to 1 stem pitch):

Condition A: MOT is more than MVT, which means travel stops on valve instead of operator.

Condition B: MOT is less than MVT by more than 1 full pitch of valve stem thread, there is

potential leakage due to under travel of valve.

8.1 End Stop Adjustment Conditions

Condition A: MOT is more than MVT, which means travel stops on valve instead of operator.

NOTE:

In Condition A, the operator travel needs to be decreased to have valve stroke limited by
operator internal stops.

1. Install operator on valve per SECTION 6. INSTALLATION, adjusting the stem
nut as directed.

2. Applying power gas slowly through cylinder plate (4) supply ports to fully
retract the drive rod (1) until the operator stops.

3. Remove the end stop cover (33) and end stop cover seal (57) to access the
end stop (32).

4. The end stop (32) will be loose in the end cap (8).

5. Screw the end stop (32) into the end cap (8) until it stops by contacting the
drive rod (1).

6. Jog the operator to slightly extend the drive rod (1), moving it away from the
end stop (32).

7. Screw the end stop (32) further into the end cap (8) by 1/8 [inch] which is a
one full turn of the end stop.

8. Apply and hold the power gas to move the piston against end stop. Check
that the end stop (32) is jammed and locked in place by the drive rod (1).

21

Operator End Stop Adjustment

Installation, Operation and Maintenance Manual

E-90090001 Rev A

9. Install and tighten the end stop cover (33) to lock-in the travel adjustment.

10. Remove the existing “MARK #4”. Mark on the drive rod (1) where the
bottom of the cylinder plate (4) align. This is the new, correct, “MARK #4”.

Condition B: MOT is less than MVT by more than 1 full pitch of valve stem thread, potential
leakage due to under travel of valve.

NOTE:

In Condition B, the operator travel needs to be increased to maximize valve travel.

1. Install operator on valve per SECTION 6. INSTALLATION, adjusting the stem
nut as directed.

2. If the drive rod (1) is fully retracted, MAKE SURE to pressurize the end cap (8)
side of the operator to allow the piston rod move away from end stop (32).

3. Remove the end stop cover (33) and end stop cover seal (57) to access the
end stop (32).

4. When the end stop (32) is free, unscrew it from the end cap (8) two to four
turns.

5. Applying power gas slowly through cylinder plate (4) supply ports to fully
retract the drive rod (1) until the operator stops.

6. Screw the end stop (32) into the end cap (8) until it stops by contacting the
drive rod (1).

7. Jog the operator to slightly extend the drive rod (1), moving it away from the
end stop (32).

8. Repeat steps 7 to 10 of Condition A above to complete the adjustment.

Section 8: Operator End Stop Adjustment

May 2014

NOTE:

The fully retracted end of the operator travel has now been set.

Operator End Stop Adjustment

22

Section 9: Testing and Troubleshooting

May 2014

Installation, Operation and Maintenance Manual

Section 9: Testing and Troubleshooting

9.1 Testing

System operation should be tested at regular intervals and performance noted to catch any
problems early. Use the following section to trace the source of problems before
proceeding to a major operator overhaul, since the operator itself is generally the least
likely component to malfunction and requires the most time and effort to service.

9.2 Troubleshooting

NOTE:

This section is mainly focused on the most common symptoms and their possible solution for
operator only, the control and control component troubleshooting is not part of the scope.

In general, unsatisfactory operation of the operator is usually due to insufcient supply due

to leakage. Please contact manufacturer for more detailed information regarding to your
requirements.

E-90090001 Rev A

1. NO MOVEMENT, SLOW, JERKY OR PARTIAL STROKE?

— Check for sufcient supply pressure and ow, that is, check upstream

accessories, such as lter, to ensure lter element is not blocked.

— Check to ensure that speed control valve and shutoff valve are not fully closed.

— Check for change in operating conditions, that is, higher line pressure,

different uid, valve packing tightened excessively.

— Check that manual override (if applicable) has not been left in locked

position and is interfering. Ensure that it has been fully disengaged to
allow movement of the operator.

NOTE:

If the problem persists, please continue to the section below.

2. CHECK FOR EXTERNAL LEAKAGE

NOTE:

The assumption below is control components and all joining ttings have been veried and
conrmed that the symptoms (leakage) are not caused by control components and all joining
ttings. The purpose of suggestions below is to identify is there any external leakage from the

operator and the location of leakage. Usually, soapy water is used to facilitate the inspection.

23

Testing and Troubleshooting

Installation, Operation and Maintenance Manual

E-90090001 Rev A

• With pressure applied to the operator, check cylinder ends, end stop, drive rod

and/or manual override (if applicable) with soapy water.

— If leakage is detected around the cylinder ends, verify torque on stay rod

(nuts), tighten if necessary on nuts to see if leakage stopped. If leakage
continues, the gaskets at cylinder ends need be replaced.

NOTE:

Please refer to Table 4. Specication of Stay Rod Nut Tightening Torque to identify the
maximum recommended torque.

— If leakage is around the end stop or manual override (if applicable),

tighten the lock nuts or end stop cover to see if leakage stops. If leakage
continues, the seal needs to be replaced.

— If leakage is around the drive rod, cycle the operator a couple of times, to

see if leakage has stopped. If leakage continues, the seal is likely damaged
and needs to be replaced.

Section 9: Testing and Troubleshooting

May 2014

NOTE:

If the external leakage is not found and the problem persists, please continue section
below to check the internal leakage.

Testing and Troubleshooting

24

Section 9: Testing and Troubleshooting

May 2014

3. CHECK FOR INTERNAL LEAKAGE (BLOW-BY)

• With pressure applied to one side of the operator, check for leakage (blow-by)

from supply port of the opposite side.

— If leakage is found and the operator has not been operated or stroked for a

long period of time, some leakage past piston seals may be observed.
Operating the operator a few times should cause the O-ring to regain
their resiliency and eliminate the problem.

— If leakage persists, then the seals need to be replaced accordingly.

NOTE:

If the problem persists, please continue to the section below.

4. VALVE LEAKAGE OR UNABLE TO CLOSE COMPLETELY

• If leakage is through line valve itself (the valve can’t be closed completely), check

the operator maximum travel (MOT) and valve maximum travel (MVT), refer to

SECTION 5.2 (Pre-installation Verication) and SECTION 8. (OPERATOR END STOP

ADJUSTMENT), if the operator stop adjustment is required, particularly if operator
was recently installed or serviced.

Installation, Operation and Maintenance Manual

E-90090001 Rev A

Please contact manufacturer should problem persist or have any other issues:

Emerson Actuation Technologies

19200 Northwest Freeway

Houston, TX 77065

T [phone]

F [phone]

www.emerson.com

25

Testing and Troubleshooting

Installation, Operation and Maintenance Manual

E-90090001 Rev A

Section 10: Document Revision

Section 10: Document Revision

Table 5. Revision Overview

ECN DATE REV BY * DATE

Released
Reviewed CHECKED P. Lok September 2013

Approved APPROVED P. Lok September 2013

September 2013 A

COMPILED C. Rico September 2013

May 2014

Document Revision

26

Appendix

May 2014

Installation, Operation and Maintenance Manual

Appendix A: List of Tables

Table 1. Denition of Terms ............................................................................................... 2

Table 2. Specication of Piston Hex Nut Tightening Torque .............................................. 18

Table 3. Specication of Jackscrew in Jacknut Tightening Torque ..................................... 19

Table 4. Specication of Stay Rod Nut Tightening Torque .................................................19

Table 5. Revision Overview .............................................................................................. 26

E-90090001 Rev A

27

Appendix

Installation, Operation and Maintenance Manual

E-90090001 Rev A

Appendix B: List of Figures

Figure 1. Typical Assembly of GVO-LP-DA on Valve .............................................................. 3

Figure 2. Linear Valve Operator Model Designation ............................................................. 4

Figure 3. Linear Valve Operator Serial Number .................................................................... 4

Figure 4. Measurement of Travel Adjustment for Valve and Operator ...................................8

Figure 5. Lifting Method .................................................................................................... 11

Figure 6. Markings for Maintenance .................................................................................. 16

Figure 7. GVO-LP-DA with Open Pedestal .......................................................................... 28

Figure 7 GVO-LP-DA with Open Pedestal

Appendix

May 2014

Appendix

An assembly drawing of Bettis™ GVO Series Pneumatic Double Acting (DA) Valve
Operator is shown above.

28

For complete list of sales and manufacturing sites, please visit

www.emerson.com/actuationtechnologieslocations or contact us at
[e-mail]

World Area Confi guration Centers (WACC) offer sales support, service,
inventory and commissioning to our global customers.
Choose the WACC or sales offi ce nearest you:

NORTH & SOUTH AMERICA

19200 Northwest Freeway
Houston TX 77065
USA
T [phone]

Av. Hollingsworth
325 Iporanga Sorocaba
SP 18087-105
Brazil
T [phone]

ASIA PACIFIC

No. 9 Gul Road
#01-02 Singapore 629361
T [phone]

No. 1 Lai Yuan Road
Wuqing Development Area
Tianjin 301700
P. R. China
T [phone]

MIDDLE EAST & AFRICA

P. O. Box 17033
Jebel Ali Free Zone
Dubai
T [phone]

P. O. Box 10305
Jubail 31961
Saudi Arabia
T [phone]

24 Angus Crescent
Longmeadow Business Estate East
P.O. Box 6908 Greenstone
1616 Modderfontein Extension 5
South Africa
T [phone]

EUROPE

Holland Fasor 6
Székesfehérvár 8000
Hungary
T [phone]

Strada Biffi 165
29017 Fiorenzuola d’Arda (PC)
Italy
T [phone]

www.emerson.com/bettis

©2018 Emerson. All rights reserved.

The Emerson logo is a trademark and service mark of Emerson Electric Co.
Bettis

TM

is a mark of one of the Emerson family of companies.

All other marks are property of their respective owners.

The contents of this publication are presented for information purposes
only, and while every effort has been made to ensure their accuracy,
they are not to be construed as warranties or guarantees, express or
implied, regarding the products or services described herein or their use
or applicability. All sales are governed by our terms and conditions, which
are available on request. We reserve the right to modify or improve the
designs or specifications of our products at any time without notice.

World Area Confi guration Centers (WACC) offer sales support, service,
inventory and commissioning to our global customers.
Choose the WACC or sales offi ce nearest you:

NORTH & SOUTH AMERICA

19200 Northwest Freeway
Houston TX 77065
USA
T [phone]

Av. Hollingsworth
325 Iporanga Sorocaba
SP 18087-105
Brazil

MIDDLE EAST & AFRICA

P. O. Box 17033
Jebel Ali Free Zone
Dubai
T [phone]

P. O. Box 10305
Jubail 31961
Saudi Arabia
T [phone]

T [phone]

24 Angus Crescent

ASIA PACIFIC

Longmeadow Business Estate East

P.O. Box 6908 Greenstone
No. 9 Gul Road
#01-02 Singapore 629361
T [phone]

No. 1 Lai Yuan Road

1616 Modderfontein Extension 5

South Africa

T [phone]

EUROPE

Wuqing Development Area
Tianjin 301700
P. R. China
T [phone]

Holland Fasor 6

Székesfehérvár 8000

Hungary

T [phone]

Strada Biffi 165

29017 Fiorenzuola d’Arda (PC)

Italy

T [phone]

For complete list of sales and manufacturing sites, please visit

www.emerson.com/actuationtechnologieslocations or contact us at
[e-mail]

www.emerson.com/bettis

©2018 Emerson. All rights reserved.

The Emerson logo is a trademark and service mark of Emerson Electric Co.

TM

is a mark of one of the Emerson family of companies.

Bettis
All other marks are property of their respective owners.

The contents of this publication are presented for information purposes
only, and while every effort has been made to ensure their accuracy,
they are not to be construed as warranties or guarantees, express or
implied, regarding the products or services described herein or their use
or applicability. All sales are governed by our terms and conditions, which
are available on request. We reserve the right to modify or improve the
designs or specifications of our products at any time without notice.