Cashco 988-MB - Manual

I. DESCRIPTION AND SCOPE
Model 988’s and 989’s are pneumatically actuated, globe-
style control valves. Sizes are 3/4", 1", 1-1/2" and 2". Ma-
te ri als are available in cast carbon steel, Grade WCB (CS);
cast 316L SST, Grade CF3M (SST); and cast CW-12MW,
sim i lar to Hastelloy C (H-C).
Failure position is determined by actuator for:
"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.
These valves are designed for chemical service and most
com mon liquid, gaseous, or steam services.
Models 988 and 989 differ only in the face-to-face di men -
sions of fl anged units; 988’s have a “regular” (“long”) body
pattern, and the 989’s have a “short” body pattern.
INSTALLATION, OPERATION & MAIN TE NANCE MANUAL (IOM) IOM-988/989
12-13
MODELS 988 and 989
GLOBE-STYLE PNEUMATIC CONTROL VALVE BODY
SECTION I
SECTION II
II. REFERENCE
Refer to Technical Bulletin 988-TB or 989-TB for complete
tech ni cal specifi cations coupled with either Cashco Actuator
Model C27 or C53.
www.cashco.com/techbulletins/988.pdf
www.cashco.com/techbulletins/989.pdf
Refer to following Installation, Operation & Main te nance
Manuals (IOM’s) for either actuator and/or devices that
maybe mounted to a Model 988 or 989:
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
ABBREVIATIONS
ATO-FC ............. Air-to-Open, Fail Closed
ATC-FO ............. Air-to-Close, Fail Open
CCW .................. Counter Clockwise
CW ..................... Clockwise
D or DIR ............. Direct Acting
HC ..................... Cast CW-12MW or Wrought Hast C-22
IAS ..................... Instrument Air Supply
LOAD ................. Positioner Output Air Pressure
R or REV ........... Reverse Acting
SIG .................... Output Signal from Instrument
SST.................... Cast or Wrought 316L Stainless Steel
V ........................ Vent
Model 988
with ATC - FO Actuator
Shown with Internal Live-Loaded Packing