Cashco 987 - Manual

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