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MODEL 987
GLOBE-STYLE
PNEUMATIC CONTROL VALVE
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).
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
pressure, 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.
II. REFERENCE
Refer to Technical Bulletin 987-TB for complete
tech ni cal specifications of a Model 987 coupled with
either Cashco Actuator Model C27 or C53.
www.cashco.com/techbulletin/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
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
BODY IOM
Internal de sign is a "push down to
SECTION II
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
ABBREVIATIONS
IOM-987
12-16
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Related Manuals for cashco 987
Summary of Contents for cashco 987
- Page 1 SECTION II II. REFERENCE ABBREVIATIONS Refer to Technical Bulletin 987-TB for complete tech ni cal specifications of a Model 987 coupled with ATC–FO – Air–to–Close, Fail Open either Cashco Actuator Model C27 or C53. ATO–FC – Air–to–Open, Fail Close www.cashco.com/techbulletin/987.pdf –...
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Page 2: Installation
If hydro test pressure exceeds the 1-1/2 x will be done on the valve body while still CWP limit, the 987 must be removed for such installed in the pipeline. testing. Before pressurization, the valve plug should be lifted from the seat if of ATO-FC 2. - Page 3 IV. STARTUP 6. Adjust the air supply airset (filter-regulator) to the proper level as indicated as follows: A. General: Bench Setting Airset Output 1. Ensure that the Model 987 unit has been psig (Barg) psig (Barg) properly adjusted and calibrated, including the positioner if installed.
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Page 4: Maintenance
4. Valves originally supplied in accordance with Option-55 require special cleaning "For ATO-FC units ONLY, connect a pro ce dures. Refer to Cashco Specification No. temporary air source to the actuator and S-1134 for details. When in compliance pressurize to a level sufficient to initiate with Spec. - Page 5 (Note RP.) nut (15) - from falling. c. S t e p B . S u p p o r t t h e a c t u a t o r as sem bly (AA) from above. Fully IOM-987...
- Page 6 1/4" thick steel 10. Install nuts (21) on studs (20). Use torque bar to remove the seat ring (3) by ro tat ing seat wrench to tighten to 25-30 in-lbs. ring (3) CCW (viewed from above) to re mov al. IOM-987...
- Page 7 29. With hand lift stem (4) up to touch ac tu a tor 22. Install bonnet flange nuts (9) and finger-tight en. stem (6). Rotate valve stem (4) CCW (viewed from above) to en gage w/ ac tu a tor stem (6). IOM-987...
- Page 8 IOM will be in double indicating washer (16) up against stem parentheses; i.e. ((AP)). All item numbers (6). that are with respect to this IOM-987 are not e. Release all pressure from the actuator and un der scored; i.e. (3). repeat Step 4 previous.
- Page 9 15 psig (1.0 Barg). 11. To limit the up travel at the desired stroke Take note of the pressure reading when length, rotate travel stop nut (52) CW and stem travel stops. secure to bottom of attachment hub (4). IOM-987...
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Page 10: Troubleshooting Guide
Excessive cavitation in liquid service. of cavitation. C2. Replace valve with valve equipped for cavitation control. D1. Reduce fl ow rate and/or pressure drop. High outlet velocity. D2. Use multiple valves in series or in parallel. D3. Increase outlet pipe size. IOM-987... - Page 11 Remedy Improper bonnet bolting draw down. Replace bonnet o-ring and draw down bolting evenly. B. Corrosion. Consider use of Model 988 or 989 or 2296. C. Over-temperature. Bring process temperature to 450 F (232 C) or less. ° ° IOM-987...
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Page 12: Section Viii
Cashco, Inc. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Cashco, Inc. product remains solely with the purchaser. - Page 13 Plug & Stem Subassembly Seat Ring O-Ring ‡ Bonnet O-Ring ‡ Bonnet Flange Bonnet Stud Flange Nut Packing ‡ Packing Follower Stud Yoke Nut Indicating Washer Stem Jam Nut Packing Stud Packing Stud Nut Packing Flange ‡ Recommended replacement parts. IOM-987...
- Page 14 ATEX requires that all components and equipment be evaluated. Cashco pressure regulators are considered components. Based on the ATEX Directive, Cashco considers the location where the pressure regulators are installed to be classified Equipment-group II, Category 3 because flammable gases would only be present for a short period of time in the event of a leak.
- Page 15 If the above issues are addressed by selecting options that do not have potential sources of ignition, avoiding options that have not been assessed, and by taking the proper usage issue precautions, then Cashco regulators can be considered to be a mechanical device that does not have its own source of ignition and thus falls outside the scope of the ATEX directive.
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