A. General Information
1. Before putting the reconditioned valve in service,
it must be set to open at the required set pressure.
Although the valve can be set on the service
installation, it is more convenient to set the valve
and check seat tightness on a test stand.
2. Test Equipment:
The test stand used for testing POSRVs normally
consists of a pressure source supply line with a throttle
valve and receiver that have the following features:
a. Outlet for attaching the valve to be tested
b.
Pressure gauge with a shutoff valve
c.
Drain line with a shutoff valve
d. Adequate receiver volume for the valve to be
tested and to achieve proper operation
3. Test Media:
For best results, valves shall be tested by type, as
follows:
a. Steam valves are tested on saturated steam.
b. Air or gas valves are tested on air or gas at
ambient temperature.
c.
Liquid valves are tested on water at ambient
temperature.
B. With Standard Options
Note: Seal all pipe threads with a non-organic
sealant or Teflon® tape.
B.1 39PV07/37
1.
Attach pilot to main valve using two Socket Head
Cap Screws (Bracket).
2. Install the 3/8” O.D. tubes (Refer to Table 15 for
sizing of tubing) into the fittings for the inlet and
dome ports. Make sure the tube ends are fully
inserted before torquing. Begin torquing the fitting,
about midway down; verify that Swagelok Gap
Inspection Gauge (Swagelok P/N MS-IG-468) will
go. Continue to torque down fitting until Swagelok
Gap Inspection Gauge will not go.
After torquing, remove to assure the ferrule is in good
contact with the tubing. Refer to Table 14 and Figure
63 to determine if ferrule has seated itself properly.
Reinstall the tubing.
Table 14: Ferrule Wall Thickness
Pressure Class
Wall Thickness (min.)
in.
mm
150# to 900#
.035
0.89
1500#
.049
1.24
2500#
.065
1.65
Table 15: Tubing Dimensions
Tubing Diameter
Tubing Length (A)
in.
mm
in.
mm
.250
6.35
.190
4.83
.375
9.53
.250
6.35
.500
12.70
.340
8.64
3. The vent port of the pilot valve is vented to
atmosphere in standard configuration.
4. Final standard configuration for a 39PV07 or
39PV37 without any options is shown in Figure 64.
A
Figure 63: Tubing Dimensions
Figure 64: 39PV07/37
XX. Setting and Testing
76 |
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