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INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

IOM-987

12-13

I. DESCRIPTION AND SCOPE

The Model 987 is a pneumatically actuated, sliding

stem globe-style control valve. Available sizes 1/2"

- 1" (DN15 - 25). Internal de sign is a “push down to

close” arrangement.

Failure position is determined by actuator.

"D" = Direct action; on increasing air loading pressure,

the actuator stem extends. Fail-safe position is with

the stem retracted.

"R" = Reverse action; on increasing air loading pres-

sure, the actuator stem retracts. Fail-safe position is

with the stem extended.

This valve is designed to control moderate to severe

corrosive applications but may be applied in general

service applications also.

SECTION II

MODEL 987

GLOBE-STYLE

PNEUMATIC CONTROL VALVE

BODY IOM

SECTION I

ABBREVIATIONS

ATC–FO – Air–to–Close, Fail Open

ATO–FC – Air–to–Open, Fail Close

CCW – Counter Clockwise

CW – Clockwise

D or DIR – Direct Acting

IAS – Instrument Air Supply

LOAD – Positioner Output Air Pressure

R or REV – Reverse Acting

SIG – Output Signal from Instrument

V – Vent

Model 987

with ATO - FC Actuator

II. REFERENCE

Refer to Technical Bulletin 987-TB for complete tech ni-

cal speciﬁ cations of a Model 987 coupled with either

Cashco Actuator Model C27 or C53.

www.cashco.com/techbulletins/987.pdf

Refer to following Installation, Operation & Main te nance

Manuals (IOM’s) for either actuator and/or devices that

maybe mounted to a Model 987:

Actuators: www.cashco.com/IOM/C27-C53.pdf

Positioners:

P/P: www.cashco.com/techbulletins/9540l.pdf

I/P: www.cashco.com/techbulletins/srd991.pdf

I/P: www.cashco.com/iom/PS2iom.pdf

Summary of content (16 pages)

PAGE 1
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL IOM-987 12-13 MODEL 987 GLOBE-STYLE PNEUMATIC CONTROL VALVE BODY IOM SECTION I I. DESCRIPTION AND SCOPE The Model 987 is a pneumatically actuated, sliding stem globe-style control valve. Available sizes 1/2" - 1" (DN15 - 25). Internal design is a “push down to close” arrangement. Failure position is determined by actuator. "D" = Direct action; on increasing air loading pressure, the actuator stem extends. Fail-safe position is with the stem retracted.
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SECTION III III. INSTALLATION practical to the valve body; this is especially important where the reducers are more than one line size larger than the valve body size, which is common in gaseous service. A. Orientation: CAUTION For welded installations, all internal trim parts and seals must be removed from body prior to welding into pipeline. The heat of fusion welding will damage non-metallic parts if not removed. NOTE: This does not apply to units equipped with extended pipe nipples. 1.
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9. Flow Direction: Install so the flow direction matches the arrow marked on the body. 10. For best performance, install in well drained horizontal pipe, properly trapped if a steam service application. Limit of Bonnet Insulation 11. Valves are not to be direct buried underground. 12. Insulation may be applied as indicated in Figure 2. Drainage away from the packing area must be ensured when fully installed, sealed and lagged for outdoors installation. 13.
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8. Confirm the action of controller and positioner – direct or reverse – are producing the desired response in the control unit. Confirm that the control valve “fail” position is as required. 11. Attempt to develop manual control of the loop by opening/closing the manual bypass as required, or by manually controlling mainstream flow as required. 9. Hereafter, the procedure assumes that actual fluid flow may be established. This may not be practical/possible in all cases; if so, vary procedure as required.
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B. Actuator Removal: 1/4"-3/8" (6-8 mm). Again, rotate valve stem (4) CW (viewed from above) to disengage the actuator stem (6) from the valve stem (4) while holding the actuator stem (6). Count and record the number of valve stem revolutions for Step B above. This should allow the stems (6) (4) to fully disengage. 1. Secure the body assembly (BA) in a vise with the actuator assembly (AA) oriented vertically.
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C. Actuator Replacement: 1. Secure body assembly (BA) in a vice with the valve stem (4) oriented vertically. Push plug/stem (4) down until the plug touches the seating surface in the body (1). 2. Secure the actuator assembly (AA) from above. Use matchmarks from B.1. previous to assist with (BA) and (AA) alignment. 3. This procedure assumes that the bonnet (2) has been installed to the body (1), with stem jam nuts (17) on the valve stem (4). 4.
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11. Remove seat ring O-ring seal (5) from seat ring (3). Inspect O-ring (5) for signs of failure to seal, then discard. 12. Remove body (1) from vise and place body (1) and seat ring (3) into a suitable cleaning solvent. 23. See Figure 5. Place a lower adapter packing ring (10.1) over the stem-end (4) and press it into the bonnet (2) packing box using the packing follower (11). Repeat for the three middle packing v-rings (10.2). Press upper adapter ring (10.
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Use the total number of revs engagement recorded in Step V.B.4. as the guide to control engagement of the stems (6) (4). While engaging the stems, rotate yoke nut (15) as able to help stabilize topworks, continue to pressurize the actuator in 2-3 psi (.15-.20 Bar) increments in an alternating sequence with the distance engaged until the total number of revs engaged is reached. 31. Secure “dangling parts” - accessory plate ((AP)) and indicator washer (16) - to actuator stem (6) with stem jam nuts (17). 32.
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indicating washer (16) as the reference point. Adjust indicator plate as needed. 10. Increase pressure in the actuator until the indicating washer (16) is in alignment with the "O" mark on the indicator plate. 11. To limit the up travel at the desired stroke length, rotate the travel stop nut (52) CW and secure to bottom of the attachment hub (4). NOTE: Secure the actuator stem (6) by the flats when rotating the travel stop nut.
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NOTE: The proper calibration of the actuator/ valve unit will occur when at the upper pressure level of bench setting, the valve plug (4) will be in the "C" position. At the lower level of bench set the actuator pressure should be within ± 8% of the lower bench setting for the designed stroke length. 12. Release all pressure from actuator. SECTION VII VII. TROUBLE-SHOOTING GUIDE 1. Valve is "jumpy" in stroking Possible Cause A. B. 2. Excess packing friction. Installed backwards. Remedy A1.
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4. Valve exhibits "excess" seat leakage. Possible Cause Remedy A. Excess pressure drop. A1. Reduce pressure drop conditions. A2. Convert to reduced trim. B. Improper actuator bench setting. B1. B2. C. Metal seat design instead of composition seat design. C. 5. Convert valve to composition seat. D. Excess wear. D1. Oversized valve operating too close to seat, convert to reduced trim. D2. Remove particulate. D3. Possible excess cavitation in liquid service, change operation parameters. D4.
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SECTION VIII VIII. ORDERING INFORMATION NEW REPLACEMENT UNIT vs PARTS "KIT" FOR FIELD REPAIR To obtain a quotation or place an order, please retrieve the Serial Number and Product Code that was stamped on the metal name plate and attached to the unit. This information can also be found on the Bill of Material ("BOM"), a parts list that was provided when unit was originally shipped. (Serial Number typically 6 digits).
PAGE 13
NOTES IOM-987 13
PAGE 14
NOTES 14 IOM-987
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Figure 4 Composition Seat Design Figure 5 Packing Design Figure 3 Representative of 1/2" – 1" Sizes Metal Seat Design. Critical Finish Zone Item No. 1 2 3 4 5 6 7 8 9 10 11 13 14 15 16 17 20 21 23 ‡ IOM-987 Description Body Bonnet Seat Ring Plug & Stem Subassembly Seat Ring O-Ring ‡ Bonnet O-Ring ‡ Bonnet Flange Bonnet Stud Flange Nut Packing ‡ Packing Follower Nut Stud Yoke Nut Indicating Washer Stem Jam Nut Packing Stud Packing Stud Nut Packing Flange Recommended replacement parts.
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Cashco, Inc. P.O. Box 6 Ellsworth, KS 67439-0006 PH (785) 472-4461 Fax. # (785) 472-3539 www.cashco.com email: sales@cashco.com Printed in U.S.A. 987-IOM Cashco GmbH Handwerkerstrasse 15 15366 Hoppegarten, Germany PH +49 3342 4243135 Fax. No. +49 3342 4243136 www.cashco.com Email: germany@cashco.com Cashco do Brasil, Ltda. Al.Venus, 340 Indaiatuba - Sao Paulo, Brazil PH +55 11 99677 7177 Fax. No. www.cashco.com Email: brazil@cashco.