Iii. installation – Cashco 988-MB User Manual
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IOM-988/989-BODY
III. INSTALLATION
A. Orientation:
1. Recommended orientation when installed in a hor i -
zon tal pipe line is with the stem vertical. Valves may
also be installed in vertical pipelines with stems
horizontal.
2. Outdoors, all installations may be oriented any
an gle from horizontal-to-vertical. (Orient actuator
vent cap, if supplied, to not collect rainwater that
might freeze.)
3. Model 988/989 valves with actuators are not rec om -
mend ed for installation with the actuator ori ent ed
down wards.
B. Piping
System:
1. It is recommended that the control valve unit be in-
stalled with a double-block and bypass as in di cat ed
in Figure 1. This arrangement is rec om mend ed
especially where maintenance will be done on the
valve body while still installed in the pipe line.
5. Clean piping of all foreign debris, including chips,
weld scale, weld spatter, oil, grease, sand or dirt
prior to in stall ing the control valve. This is an ab so-
lute re quire ment for valves supplied with com po si-
tion soft seats. System startup strain ers for re mov al
shortly after initial startup are rec om mend ed.
6. Field hydrostatic testing the completed piping
sys tem to 1-1/2 x CWP in psig indicated on the
name plate including the Mod el 988/989 is ac-
ceptable. If hydro test pressure exceeds the 1-1/2
x CWP limit, the 988/989 must be removed for
such testing. Be fore pressurization, the valve plug
should be lifted from the seat if of reverse, ATO-FC
action. Tighten packing as required.
7. In placing thread sealant on pipe ends prior to en-
gage ment, ensure that excess material is re moved
and not allowed to enter the valve upon startup.
8. Flow Direction: Install so the fl ow direction match es
the arrow on the valve body.
9. For best performance, install in well drained
hor i zon tal pipe, properly trapped if a steam service
ap pli ca tion.
10. Valves are not to be direct buried underground.
11. Insulation may be applied as indicated in Figure
2. Drain age away from the packing area must be
en sured when fully in stalled, sealed and lagged for
outdoors in stal la tion.
12. Undue piping stress/strain or bending torques may
not be transmitted through the control valve body.
One pipe (inlet or outlet) should be anchored rig-
id ly for piping that is “hot” or “cold” with respect to
ambient temperature; the re main ing pipe (inlet or
outlet) should be supported and guid ed to ensure
unidirectional expansion/contraction.
SECTION III
2. Pipe unions are recommended for NPT screwed
or sock et welded installations to allow complete
re mov al from sys tem. If removal for maintenance
is by cutting torch for socket welded valves, leave
suffi cient pipe nipple space between the body and
the next piping component up or downstream to
allow socket weld couplings for re in stal la tion.
3. If pipe reducers are located before and/or after the
valve body, keep the reducers as close as prac ti cal
to the valve body; this is especially important where
the re duc ers are more than one line size larger than
the valve body size, which is common in gaseous
service.
Figure 1: Typical Control Valve Station
Recommended Maximum Flange Bolting Torque (ft-lbs.)
Body Size
Body Material
150# Flange
300# Flange
3/4"
CS
23
28
1"
29
36
1-1/2"
43
43
2"
66
33
3/4"
SST
19
25
1"
24
30
1-1/2"
36
36
2"
54
27
3/4"
HC
26
32
1"
32
40
1-1/2"
48
48
2"
72
36
4. For
split-ring
fl anged end connections, install fl ange
bolting to following torque values.