Cashco C27 - C53 Actuator - Manual

INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM) IOM-C27-C53
12-13
MODELS C27 - C53
SPRING/DIAPHRAGM LINEAR PNEUMATIC ACTUATORS
SECTION I
I. DESCRIPTION AND SCOPE
Actuator models C27 and C53 are multi-spring,
single acting, spring opposed, linear actuators used
with Cashco sliding stem (linear), globe-style control
valves. The “R” denotes“ reverse”acting arrangement;
the “D” denotes “direct” acting arrangement and are
reversible in the fi eld.
“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.
When coupled with a globe-style control valve with
pushdown to close action, a “D”- direct acting actua-
tor will provide valve “fail open” action;“D” = ATC-FO.
When coupled with an “R” - reverse acting actuator,
will provide valve “fail closed” action; “R” = ATO-FC.
Shown w/ATO-FC Action
II. REFERENCES
Refer to the Control Valve Technical Bulletin this
actuator is unitized with for complete tech ni cal
specifi cations.
Refer to following Installation, Operation & Main te-
nance Manuals (IOM’s) for other devices that maybe
mounted to C27-C53 actuators:
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
SECTION II
ABBREVIATIONS
ATO-FC ... Air-to-Open, Fail Close
ATC-FO ... Air-to-Close, Fail Open
CCW ........ Counter Clockwise
CW ........... Clockwise
D or DIR ... Direct Acting
R or REV.. Reverse Acting
IAS ........... Instrument Air Supply
IOM .......... Installation, Operation and Maintenance
Man u al
SIG .......... Output Signal from Instrument
LOAD ....... Positioner Output Air Pressure
V .............. Vent