Leslie Controls CONTROL VALVES SINGLE PORTED DOS User Manual

12501 Telecom Drive, Tampa Florida 33637

INSTALLATION

V

ALVE POSITION

P

ROBLEM PREVENTING PROCEDURES

OPERATION
MAINTENANCE

R

EPLACING VALVE PLUG STEM PACKING

D

ISMANTLING

TO I

NSTALL A COMPLETE SET OF PACKING

R

EMOVING ACTUATOR FROM VALVE BODY ASSEMBLY

V

ALVES FITTED WITH CAGE TYPE TRIM (O IN CLASS

R

EPLACING SEAT RING(S

TO I

NSTALL SEAT RING(S

I

NSPECTION, CLEANING, REWORKING OR REPLACEMENT OF PARTS

O

RDERING PARTS

C

LEANING

L

APPING IN VALVE PLUG AND SEAT RING(S

C

ONTROL VALVES FITTED WITH CAGE TYPE TRIM

R

EASSEMBLY- SINGLE PORTED CONTROL VALVES

C

AGE TYPE TRIM

A

DJUSTING ACTUATOR SPRING PRELOAD (STARTING PRESSURE

S

INGLE PORTED UNBALANCED CONTROL VALVES

S

INGLE PORTED CONTROL VALVES

A

DJUSTED CONTROL VALVE FOR RATED TRAVEL

S

INGLE PORTED UNBALANCED

S

INGLE PORTED UNBALANCED CONTROL VALVES

ACTUATOR MAINTENANCE REPLACING DIAPHRAGMS, STEM
SEALS, ETC.

R

EASSEMBLY

A

LL ACTUATORS

TO C

NOTE 1: Where noise is a factor follows recommendations for piping and fittings per 5/0.3.1.

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HANGE VALVE ACTION FROM NORMALLY OPEN TO NORMALLY CLOSED OR VICE-VERSA

Installation, Operation

and Maintenance

Rev. 0

CONTROL VALVES

SINGLE PORTED

CLASSES DL, DDL, DOS, DDOS

TABLE OF CONTENTS

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)................................................................................4

)/I

10/1.5.1

NSERTS

)/I

........................................................................................................................................4

(DOS T

...............................................................................................................................................7

.........................................................................................................................................8

YPE CTRIM PARTS) (SEE FIG.

.......................................................................................................................................7

.............................................................................................................4

NSERTS

.............................................................................................................4

............................................................4

)/I

NSERT

..................................................................................5

.....................................................................................5

(DL T

YPE

) ...................................................................5

3)...........................................................................5

)...............................................................6

(DDL, DDOS T

(DL, DOS T

(DL, DOS T

YPES

.......................................................................................6

YPES

) ......................................................................................6

(DDL, DDOS T

YPES

)........................................................6

)..........................................................................6

YPES

) ..................................................7

................8

Illustration Index

Figure 1 - Typical Installation .........................................................................................................................3

Figure 2 - Typical Control Valve Station for Control of Compressible Fluids at 25% or Less of Inlet Pressure

.................................................................................................................................................................3

Figure 3 - Cage Trim (DOS Type) ..................................................................................................................5

Figure 4 - Single Ported Control Valve Body Assmebly (Actuator Removed)...............................................5

Figure 5 - Use of Seat Ring Wrenches to Remove or Install Seat Rings.........................................................6

Figure 6 - Main Body Sub-Assembly..............................................................................................................6

Figure 7 - Alternate Method ............................................................................................................................7

Figure 8 - Direct Acting Diaphragm Actuator...............................................................................................10

Figure 9-Reverse Acting Diaphragm Actuator..............................................................................................10

2

extraordinary loads to the pressure

INSTALLATION

Valve Position

(see Fig. 1)

Install control valve in the highest horizontal line
of piping, in an accessible location and with
arrow on side of valve body in direction of fluid
flow. Control valve may be placed in any
position, but upright is preferable for ease of
maintenance.

Figure 1 - Typical Installation

Problem Preventing Procedures

1. Provide removal space above, below

and around control valve for easy
removal of parts during maintenance.
See proper drawing for dimensions.

2. Blow or flush out pipelines thoroughly

before installing control valve.

3. Protect control valve and the following

equipment with a self-cleaning strainer.

4. Install stop valves and gauges in inlet

and outlet lines to provide means for
checking adjustment and operation of
equipment.

5. Provide proper inlet and outlet drainage

in steam service to prevent water
hammer or possible erosion of
equipment.

6. Adhere to good piping practice. Install

a bypass around the control valve.

Connect operating medium tubing from control
pilot instrument or loading device to diaphragm
chamber connection of control valve or to valve
positioner, if one is in use.

Important: If control valve is fitted with a
Thermo-Isolating bonnet, do not lag or insulate

bonnet or paint it other than dull black, otherwise
its heat emitting efficiency will be impaired and
packing will be submitted to excessive
temperature.

RECOMMENDED PIPING FOR CONTROL
OF COMPRESSIBLE FLUIDS AT VALUES
OF 25% OR LESS OF INLET PRESSURE.

1. Expand outlet pipe to twice control

2. Connect control pipe for control pilot

3. Make control pipe connection at least

NOTE: Where sensing impulse is taken 2’ to 3’
downstream from control valve (expander),
dimension “A” minimum of 6’ to 10’ will
provide lowest noise and velocity factors,
accurate pressure sensing and reasonable bypass
length.

The piping system must be adequately

designed and supported to prevent

valve inlet pipe size. Use tapered
expander.

ahead of outlet stop valve and at least 2’
to 3’ downstream from end of expander.

18” to 24’’ from outlet stop valve, any
elbow or other flow direction out
changing fitting. (see Fig. 2)

Figure 2 - Typical Control Valve Station for

Control of Compressible Fluids at 25% or

CAUTION!

Less of Inlet Pressure

OPERATION

1. Close inlet and outlet stop valves.

2. Check that control valve responds

properly through rated travel in relation
to changes in operating pressure on the

3

diaphragm. Rated travel is shown by
position of travel indicator on valve
stem relative to travel indicator scale on
yoke.

3. Manually operate control valves fitted

with manual operating devices through
rated travel to check freedom of
movement.

4. Place control valve in operation in

accordance with instructions furnished
with control pilot or other operating
device.

MAINTENANCE

(DL, DDL, DOS, DDOS – 600 lbs. or
less)

NOTE: To reduce maintenance time refer to
proper drawing and follow steps shown below
for applicable maintenance operation.

To Renew Valve Plug
Stem Packing
To dismantle Control
Valve – Inspect Parts –
Replace or Regrind
Valve Plug/Seat
Ring(s)
To Reassemble
Control Valve
To Preload Adjusting
Spring Set Rated
Travel
To Replace Diaphragm
and/or Stem Seal
To change Valve
Action Normally Open
to Normally Closed or
Vice Versa

Injury or death can occur due to failure to

completely isolate valve from all sources of

pressure before beginning disassembly. Do not

proceed until valve has been completely isolated

from the process and vented to atmosphere.

WARNING

Maintenance

Maintenance ­Dismantling

Maintenance –
Reassembly
Maintenance –
Reassembly 3 thru 10

Actuator Maintenance

Actuator Maintenance

Replacing Valve plug Stem
Packing

Replace valve plug stem packing if control valve
has been in service beyond normal maintenance
and packing shows signs of wear. Wear will be
indicated by leakage, which cannot be corrected
by minor tightening of packing flange.

Where Leslie BRAIDED TEFLON GRAPHITE
packing is in use, additional packing rings can be
installed to overcome minor leakage without
dismantling the control valve or breaking valve
plug connection.

Dismantling

1. Close inlet and outlet stop valves. Operate

system on bypass, if necessary.

2. Shut off operating medium and relieve

pressure from diaphragm by disconnecting
tubing at diaphragm case.

To Install a Complete Set of
Packing

1. Disassemble control valve as far as

necessary for work required. Remove old
packing. Clean valve plug stem and packing
box thoroughly. Polish valve plug stem with
crocus cloth. Use approved, non-residue
forming solvent for cleaning. Wipe dry with
clean cloth.

2. Insert a new set of packing in packing box in

the order shown on the packing wrapper.
Packing wrapper contains complete
installation instructions on how to install a
set of packing. Each wrapper shows the
order in which the various pieces of packing
are to be inserted in the particular valve in
which they are to be used.

3. After packing is installed, reassemble

packing follower, packing box flange and
bolts/studs to bonnet. Tighten bolts/studs as
shown in instruction on wrapper.

4