Field Testing Of Posrv Assembly; Field Test Connection; Pilot Valve Tester; Hydrostatic Testing And Gagging - Baker Hughes Consolidated 4900 Series Instruction Manual

XIX. Setting and Testing (Cont.)
F. Field Testing of POSRV Assembly
F.1 Field Test Connection
A 1/4" FNPT field test connection is standard on
all pilot valve types. This allows the stroking of the
valve with an auxiliary media, e.g. air or nitrogen.
An internal check valve is present in the field test
connection isolating the inlet media from the test
media and at the same time, allowing the valve
to open normally in the event of a system over
pressurization during a field test.
F.2 Pilot Valve Tester
The pilot valve test indicator is available for the
modulating and pop action pilot valves. The valve
test indicator measures the set pressure of the pilot,
while maintaining pressure on the main valve dome
area; thereby, allowing only the pilot to actuate. The
system shown in Figure 41 is available for remote or
local testing.
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G. Hydrostatic Testing and Gagging
When hydrostatic tests are required after installation
of a POSRV, remove the POSRV and replace it with
a blind flange. If the hydrostatic test pressure will not
be greater than the set pressure of the POSRV, a
test gag may be used (see Figure 5H). Very little
force, i.e., hand-tight pressure, on the test gag is
sufficient to hold hydrostatic pressures. Too much
force applied to the gag may bend the spindle and
prevent the pilot from performing correctly.
After a hydrostatic test, the gag must be removed
and replaced by the sealing plug furnished for
this purpose.
Consolidated 4900 MPV Series POSRV Manual
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