cashco 988 Посібник зі встановлення, експлуатації та обслуговування - Сторінка 2
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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.
Drain
Figure 1: Typical Control Valve Station
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
sufficient 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.
2
SECTION III
Drain
4.
For split-ring flanged end connections, install flange
bolting to following torque values.
Recommended Maximum Flange Bolting Torque (ft-lbs.)
Body Size
Body Material
3/4"
1"
CS
1-1/2"
2"
3/4"
1"
SST
1-1/2"
2"
3/4"
1"
HC
1-1/2"
2"
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
acceptable. 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 flow 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
150# Flange
300# Flange
23
28
29
36
43
43
66
33
19
25
24
30
36
36
54
27
26
32
32
40
48
48
72
36
IOM-988/989-BODY