Leslie Controls DLOS-2, DDLOS-2 User Manual

12501 Telecom Drive, Tampa Florida 33637

Installation, Operating,

and Maintenance

Instructions Parts List

10/9.5.1.2

Rev. 2

CONTROL VALV

Low Pressure, Single Ported, Cage Trim

Classes DLO-2, DDLO-2 125# & 250# Cast Iron

Classes DLOS-2 & DDLOS-2 150# & 300# Cast Steel

Classes DLOS-2 & DDLOS-2 150# & 300# Stainless Steel

TABLE OF CONTENTS

SECTION I – INSTALLATION .................................................................................................................... 2

SECTION II – OPERATION ......................................................................................................................... 2

SECTION III – MAINTENANCE ................................................................................................................. 3

SECTION IV – PARTS LIST....................................................................................................................... 10

ILLUSTRATION INDEX

DRAWINGS, DIMENSIONS, TYPICAL INSTALLATIONS AND

SCELLANEOUS DATA

Figure 1 - Typical Installation Expand as required for fluid flow………………………………………………2 Figure 2 - Typical Control Valve Station for Control of Compressible Fluids at 25% or Less of Inlet Pressure.

Expand further as required for fluid flow………………………………………………………………….2 Figure 3 - Typical Valve Cutaway………………………………………………………………………………3 Figure 4 - Installation Sequence…………………………………………………………………………………4 Figure 5 - Installation Sequence…………………………………………………………………………………4 Figure 6 - Installation Sequence…………………………………………………………………………………5 Drawing - Diaphragm Control Valve…………………………………………………………………………..11 Drawing - Accessory Mount View……………………………………………………………………………..12 Drawing - Diaphragm Control Valve CLASS D(D)LOS-2, D(D)LOAS-2 and CLASS D(D)LO-2, D(D)LOA-2……………………………………………………………………………14 Drawing - Direct Acting……………………………………………………………………………………….17 Drawing - Reverse Acting……………………………………………………………………………………..18

traordinary loads to the pressure

SECTION I – INSTALLATION

1. VALVE POSITION

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 Expand as required for fluid flow

2. PROBLEM PREVENTING

PROCEDURES

• Provide removal space above, below and

around control valve for easy removal of parts during maintenance. See Dwg. 10/9.4.1 or 10/9.4.3 for dimensions.

• Blow or flush out pipelines thoroughly

before installing control valve.

• Protect control valve and following

equipment with a SELF-CLEANING STRAINER.

• Install stop valves and gauges in inlet and

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

• Provide proper inlet and outlet drainage in

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

• Adhere to good piping practice. Install a

bypass around the control valve.

3. Connect operating medium tubing from

ontrol pilot, instrument or loading device to

c diaphragm chamber connection of control valve or to valve positioner, if one is in use. Maximum allowable operating pressure for diaphragm actuators is 60 psig.

4. Recommended Piping for Control of

ompressible Fluids at Values of 25% or

C Less of Inlet Pressure.

The piping system must be adequately

designed and supported to prevent

Expand outlet pipe to twice control valve inlet pipe size. Use tapered expander.

• Connect control pipe for control pilot ahead

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

• Make control pipe connection at least 18” to

2’ from outlet stop valve, any elbow or other flow direction changing fitting.

Figure 2 - Typical Control Valve Station for Control of Compressible Fluids at 25% or Less of Inlet Pressure. Expand further as required for fluid flow.

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.

CAUTION!

SECTION II – OPERATION

1. Close inlet and outlet stop valves.

2. Check that control valve responds properly

rough rated travel in relation to changes in

th operating pressure on the 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. Return manual operating device to its standby position.

4. Place control valve in operation in

ccordance with instructions furnished with

a control pilot or operating device.

Figure 3 - Typical Valve Cutaway

the valve.

SECTION III –

MAINTENANCE

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

RENEWING VALVE PLUG STEM PACKING (See Fig. 3, Fig. 4 and 5)

Renew 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 at the packing gland. Minor leakage of graphite packing can be corrected by tightening the packing flange.

Over-tightening of the packing flange

adjustments can cause erratic operation of

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.

Shut down inlet and outlet stop valves and check that valve body is not under pressure. Remove nuts and lift packing flange and packing bearing a sufficient height on valve plug stem to apply a split packing ring around diameter of valve plug stem. Lower packing bearing over the new ring, lower packing flange and tighten sufficiently with nuts to stop leakage.

To replace LESLIE “TEFLON” packing set or a complete GRAPHITE 11 packing set, the control valve must be dismantled.

Installation of Stem Packing

Stuffing box interior and valve plug stem must be clean, smooth and free from imperfections that may cause new packing to leak.

CAUTION!

RAIDED PTFE/GRAPHITE TYPE

B PACKING

Figure 4 - Installation Sequence

1. Place metal ring in stuffing box making sure

it bottoms in box followed by spring and second metal ring. Install bottom Teflon adaptor chevron, four Teflon packing chevrons and top Teflon adaptor chevron in accordance with Fig. 6.

2. Install packing follower, packing flange and

uts. Tighten stuffing box nuts until

n follower bottoms on bonnet.

PTFE CHEVRON TYPE PACKING

Figure 5 - Installation Sequence

LAMINATED GRAPHITE PACKING

Packing tools are available from Leslie Controls and should be used to insure proper installation of packing. Packing tool reference numbers are shown on Dwg. 10/0.5.9, which also shows how to make the tools.

Figure 6 - Installation Sequence

INSTALLATION

Place spacers and packing rings over stem and into packing box in order shown on drawing, one at a time, seating each firmly and using care not to tear rings on the stem threads. Adjust packing gland nuts equally-finger tight plus 1/6 turn (one flat of nut).

ADJUSTMENT

During start-up some leakage may be observed. Do not readjust packing-allow at least 15 minutes for pressure/temperature stabilization to occur. If leakage continues adjust a maximum of 1/6 turn at a time. If pressure is raised considerably, the packing may leak slightly. Do not readjust-leakage will stop when new pressure/temperature stabilization is reached.

BREAK-IN

For best results it is recommended that after packing installation and adjustment the valve be fully stroked approximately 20 times to break-in the packing and reduce stem friction.

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.

DISASSEMBLY OF ACTUATOR FROM VALVE BODY ASSEMBLY (See Fig. 6, 6A, 7 and 9 in Appendix)

WARNING

1. Close inlet and outlet stop valve and relieve

all pressure from piping involved. Remove all compression from adjusting spring(s).

2. NORMALLY OPEN VALVES-DLO(S)-2.

Relieve air pressure from diaphragm of actuator. Remove the tubing from upper diaphragm case.

3. NORMALLY CLOSED VALVES-

DDLO(S)-2. Supply sufficient air to the actuator diaphragm to keep valve plug from touching seat while disengaging valve plug stem from actuator stem.

4. Loosen valve stem nut. Use wrench on plug

stem flats and turn valve plug out of actuator stem until stems separate. Remove the tubing from lower diaphragm case.

5. Remove cap screws holding actuator to

onnet and lift off actuator.

DISASSEMBLY VALVE BODY SUBASSEMBLY (VBSA) (See Fig. 6 and 6A in Appendix)

1. Remove actuator from VBSA as previously

described in Disassembly of Actuator from Valve Body Subassembly.

2. Remove bonnet nuts (10). Also bolts (11)

for DLOS only.

3. Lift bonnet assembly including valve plug

(2) from valve body (1).

4. Remove valve plug (2), packing bearing

12) and old packing set (17). Include

( spring (15) for Teflon packing set.

5. Remove bonnet gasket (8), seat retainer (5),

seat ring (4) and seal (3). If necessary, remove seat ring by forcing a wooden dowel into seat bore and lifting.

CLEANING

1. Clean all parts thoroughly. Polish valve

plug stem with crocus cloth. It should be smooth and free of scratches in packing area. Use approved, non-residue forming solvent for cleaning. Wipe dry with clean cloth.

2. Inspect all parts and replace any excessively

orn or damaged part.

3. Install a new packing set of braided Teflon

graphite or Teflon chevron rings as shown on packing installation sketch Fig. 3, 4 or 5. See previous section on renewing valve plug stem packing.

4. The packing bearings have a long wearing

life material which under normal usage should not require replacement, however, if damaged or worn the packing bearing (12) and/or the bonnet (6) must be replaced. (Lower bearing in bonnet is not supplied separately.)

5. The gasket (8) and seal (3) should be

eplaced each time the valve body

r subassembly is disassembled for cleaning.

All LESLIE control valves are made of the finest material obtainable, time-tested and backed by over seventy-five years of know-how. Machining is done by expert craftsmen and each valve is inspected and service tested before shipment to you.

REASSEMBLY VALVE BODY SUBASSEMBLY LAPPING VALVE PLUG AND SEAT

1. Insert raised face of seat ring (4) into seat

retainer cage (5) and place these into bore of valve body bridge.

2. Place new bonnet gasket (8) into body

ecess.

3. With light pressure and turning motion

ssemble valve plug (2) to the bonnet (6) being careful not to damage bearings or packing set (17).

4. Apply very thin film of superfine lapping

compound to the valve plug seating surface.

5. Assemble bonnet (6) complete with valve

plug (2) to valve body (1) applying nuts (10) only finger tight to studs or bolts (11). The bonnet acts as a guide when grinding valve plug.

6. Use wrench on flats of valve plug stem for

rning valve plug (2). Do not bear down on

tu valve plug stem when lapping. Weight of parts is sufficient to cause lapping action.

7. As lapping progresses lift valve plug off seat

occasionally and rotate 45˚ to keep compound evenly distributed. Remove all traces of compound after lapping. Excessive lapping should be avoided.

8. Remove bonnet nuts (10), bonnet assembly,

and all body assembly parts. Then remove all traces of lapping compound from both valve plug (2) and seat ring (4). Check that a fine continuous ring of contact has been made on both seats. The contact ring should be visible but without depth.

9. Apply silicone grease to seat ring seal (3)

nd insert seal into groove of seat ring (4).

10. Insert raised face of seat ring (4) into seat

retainer cage (5) and place these into bore of valve body bridge. Seat ring (4) sealing face must be firmly seated in place.

11. Place the bonnet gasket (8) in body recess

and add the bonnet assembly. Apply nuts (10) to bolts or studs (11) and tighten evenly for metal to metal joint.

12. Place actuator back on bonnet. CAUTION:

For reverse acting actuators only, air pressure must be supplied to the diaphragm chamber sufficient to cause actuator stem to lift its full travel so valve plug threads may later be engaged.

13. Place packing flange (13) with concaved

ide of hole facing down thru window of

+ 14 hidden pages

Leslie Controls DLOS-2, DDLOS-2 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual