Flowserve BX 150 User Manual

Valtek Valdisk 150
Control Valves

GENERAL INFORMATION

The following instructions are designed to assist in
unpacking, installing, operating and performing mainte­nance as required on Valdisk 150 butterfly valves.
Product users and maintenance personnel should thor­oughly review this bulletin prior to working on the valve.
Separate maintenance instructions cover additional fea­tures (such as positioners, special accessories, fail­safe systems,etc.)

This publication does not contain information on install­ing, maintaining, troubleshooting, calibrating, and oper­ating Valtek actuators or positioners. Refer to the
appropriate Valtek Installation, Operation, Maintenance
Instructions when this information is required.

To avoid possible injury to personnel or damage
to valve parts, WARNING and CAUTION notes
must be strictly adhered to. Modifying this prod­uct, substituting nonfactory parts, or using
maintenance procedures other than outlined
could drastically affect performance, be hazard­ous to personnel and equipment, and may void
existing warranties.

WARNING: Standard industry safety practices must
be adhered to when working on this, or any other,
process control product. Specifically, personal
protective and lifting devices must be used as war­ranted.

NOTE: Selecting the proper fastener material is the

responsibility of the customer. Typically, the supplier
does not know what the valve service conditions or
environment may be. Valtek‘s standard bolting material
is B7/2H. B8 (stainless steel) is optional for applications
above 800O F and with stainless steel or alloy body
valves. The customer therefore must consider the
material’s resistance to stress corrosion cracking in
addition to general corrosion. As with any mechanical
equipment, periodic inspection and maintenance is
required. For more information about fastener materi­als, contact your local Valtek representative or factory.

Unpacking

1. While unpacking the valve, check the packing list
against the materials received. Lists describing the
valve and accessories are included in each shipping
container.

2. When lifting the valve from the shipping container,
position lifting straps to avoid damage to tubing and
mounted accessories. Most Valdisk 150 valves
may be lifted by the actuator lifting ring. If no lifting
ring is provided, lift the valve using lifting straps or
hook through the yoke legs and outer end of the
body.

3. In the event of shipping damage, contact your ship­per immediately.

4. Should any problem arise, contact your Valtek rep­resentative.

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Installation

TABLE I:

1. Before installing the valve, clean the line of dirt,
scale, welding chips, and other foreign material.
Clean gasket surfaces thoroughly to insure leak­proof joints.

2. Check flow direction to be sure valve is installed
correctly. Fail-closed valves should be installed
with the shaft upstream only in gas service. It
is preferred that liquid service valves be installed
with the shaft downstream regardless of air fail­ure action. However, under certain flow condi­tions the valve can flow shaft upstream. Consult
the factory if the valve must be mounted with the
shaft upstream in liquid service. Fail-open valves
should be installed with the shaft downstream.

3. Fully close the valve before and during the instal­lation process.

WARNING: Keep hands, hair, clothing, etc. away
from the rotating disc and the seat when operat­ing the valve. Failure to do so could cause seri­ous injury.

WARNING: When valve is installed for end-of­line service, retainer ring must be supported by
the mating pipe flange.

CAUTION: Because of Valdisk 150’s self-cen­tering seat, there is no reason to open the
valve at any time during installation. There­fore, the valve should remain closed until the
valve is fully installed.

4. Connect the air supply and instrument signal.
Throttling valves are usually equipped with valve
positioners. Two connections are marked for the
air supply and for the instrument signal. Both
cylinder and positioner are suitable for 150 psi air
supply. An air regulator is not required unless the
supply pressure exceeds 150 psi. An air filter is
recommended unless the supply air is unusually
clean and dry. All connections must be free of
leaks.

NOTE: In some rare cases, the air supply must
be limited to 80 psi rather than 150 psi. In this
case, a sticker found near the upper air port on the
cylinder will indicate this and an air regulator may
need to be installed to insure the supply pressure
does not exceed 80 psi.

5. Make sure proper clearance exists internally in
the mating piping to permit proper disc rotation.

6. Apply the recommended torque values to the line
flange bolting for proper sealing (see Table 1).

Flange Bolting Torques* (Class 150)

Valve Size

(inches)

2, 3, 4 118 160

6, 8 209 282

10, 12 337 455

* For intermediate strength bolting, per ASME/ANSI B16.5 – 1988.

Torque Values

(ft-lbs) (newton-meter)

Quick-check

Prior to start-up, check the control valve by following
these steps.

1. Check for full stroke by making the appropriate in­strument signal change. Observe the disc position
indicator plate mounted on the actuator transfer
case cover plate. The disc should change position
in a smooth, rotary fashion.

2. Check all air connections for leaks. Tighten or re­place any leaking lines.

3. Evenly tighten the packing nuts on the valve to fin­ger tight plus

CAUTION: Do not overtighten packing. This can
cause excessive packing wear and high shaft
friction, which may impede shaft rotation.

After the valve has been in operation for a short time,
check the packing nuts to make sure they are just
over finger-tight (readjust if necessary). If packing
box leaking occurs, tighten the packing nuts only
enough to stop leakage.

4. To observe the valve failure mode in case of air fail­ure, position the valve to mid-stroke and shut off the
air supply or disconnect the instrument signal. By
observing the indicator plate, the disc should either
fail open or closed. If incorrect, refer to the “Revers­ing the Actuator” section in the appropriate Actuator
Maintenance Instructions.

1

/2 to one full turn (Teflon only).

PREVENTIVE MAINTENANCE

At least once every six months, check for proper opera­tion by following the preventative maintenance steps
outlined below. These steps can be performed while the
valve is in line and, in some cases, without interrupting
service. If an internal problem is suspected, refer to the
“Disassembly and Reassembly” section.

1. Look for signs of gasket leakage through the body
and line flanges. Tighten flange bolting if necessary.

2. Note if any corrosive fumes or process drippings
are damaging the valve.

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Packing Retainer

Packing

Shaft

(Item No. 88)

(Item No. 51)

(Item No. 85)

Packing Box Nut

(Item No. 117)

Gland Flange

(Item No. 80)

Packing Box Stud

(Item No. 109)

Packing Follower

(Item No. 87)

Shaft Bearing

(Item No. 83)

Thrust Washer

(Item No. 82)

Taper Pin

(Item No. 52)

Body

(Item No. 1)

Disc

(Item No. 50)

Thrust
Washer

(Item No. 82)

Shaft
Bearing

(Item No. 84)

Disc Stop

Figure 1: Body Assembly

NOTE: Item numbers correspond directly to the valve’s bill of material. Refer to it for specific part numbers.

3. Clean valve and re-paint areas of severe oxidation.

4. Check packing box bolting for proper tightness.
Packing nuts should be slightly over finger-tight;
however, tighten as necessary to prevent stem
leakage.

CAUTION: Do not overtighten packing.

5. If the valve is supplied with a lubricator, check lubri­cant supply and add lubricant if necessary.

6. If possible, stroke the valve and check for smooth,
full-stroke operation by observing the disc position
indicator plate mounted on the transfer case. Un­steady movement of the disc could indicate an inter­nal valve problem (jerky motion is normal whenever
Grafoil packing is used).

7. Check positioner calibration by observing the
gauges and disc position indicator plate. Make sure
positioner is calibrated to the correct range. Refer
to positioner instructions for additional preventative
maintenance.

8. If possible, depressurize the actuator, and remove
the actuator transfer case cover plate, and make
sure the positioner linkage is securely fastened.

CAUTION: Never apply air to the actuator with­out the cover plate installed; otherwise, the un­supported shaft may sustain damage.

9. Be certain all accessories, brackets and bolting are
securely fastened.

10. If possible, remove the air supply and observe the
position indicator plate for correct fail-safe action.

11. Spray soap solution around the cylinder retaining
ring and the adjusting screw to check for air leaks
through the O-rings.

12. Clean any dirt or other foreign material from the
exposed portion of the shaft.

13. If an air filter is supplied, check and replace the
cartridge if necessary.

37-3