cashco 521 Handbuch für Installation, Betrieb und Wartung - Seite 2
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III. INSTALLATION
A. Orientation
1. Recommended orientation when installed
is in a hor i zon tal pipeline with the stem
vertical. Valves may be installed in a vertical
or hor i zon tal pipeline with the stem between
vertical and horizontal.
2. Outdoors, all installations may be oriented
at any angle from horizontal-to-vertical, as
per A.1. above.
3. Model 521 valves should not be installed
with the stem oriented below horizontal/
down wards.
4. In no case is additional weight to be applied
to the actuator assembly when installed in
an ori en ta tion other than vertical.
The valve/actuator unit should not be used as a
"step" to sup port per son nel. Failure to comply
may cause leak age at the bonnet/body joint,
al low ing pos si ble con tact with harm ful fluids.
B. Piping System
1. It is recommended that the control valve
unit be installed with a double-block and
bypass as indicated in Figure 1. This
arrangement is recommended especially
where main te nance will be done on the valve
body while still installed in the pipeline.
Figure 1: Typical Control Valve Station
2
WARNING
SECTION III
2. If pipe reducers are located before and/or
after the valve body, keep the reducers as
close as practical to the valve body; this is
especially important where the reducers are
more than one line size larger than the valve
body size, which is common in gaseous
ser vice.
3. Clean the piping of all foreign debris,
including chips, weld scale, weld splatter,
oil, grease, sand or dirt prior to installing
the control valve; THIS IS AN ABSOLUTE
REQUIREMENT.
4. Field hydrostatic testing the completed
piping system, including the Model 521,
to 1-1/2 x CWP in di cat ed on Model 521
name plate is ac cept able. If hydro test
pres sure ex ceeds the 1-1/2 x CWP limit,
the 521 must be re moved for such testing.
Before pres sur iza tion, the valve plug should
be lifted from the seat if of re verse, ATO-FC
action.
5. Flow Direction: Install so the flow direction
match es the arrow cast on the valve body.
6. Valves are not to be direct buried
un der ground.
7. Insulation may be applied as indicated in
Fig ure 2. Drainage from the packing area
must be ensured when fully installed, sealed
and lagged for outdoors installation. Vented
pipe plug (12) should not be covered.
8. Undue piping stress/strain or bending
torques may not be transmitted through
the control valve body. One pipe (inlet
or outlet) should be anchored rigidly for
piping that is "hot" or "cold" with respect to
Figure 2: Body Insulation
IOM-521