Flow Safe F8000 Series - Page 27

INSTALLATION, OPERATION, &
MAINTENANCE MANUAL
TITLE: F7000 / 8000 Series Rev. V
Pilot-Operated Safety Relief Valve Page 27 of 41
5.2.2 Testing of Complete Assembly
CAUTION: Extreme care must be taken when testing or servicing a pressure relief valve used in gas
or incompressible fluid service. The service medium may be volatile and under high
pressure.
CAUTION: Performance of the procedure below will cause the main valve to open, unless inlet
pressure is closed off by a block valve or the system is depressurized.
If a portion of the relief valve’s system or a test tank large enough to mount the main valve inlet is available
for test, set pressure can be checked on the complete relief valve assembly. The main valve outlet will
need to be open and accessible in order to verify flow from the main piston, or alternate methods will need
to be used to detect pilot set point per Section 6.4, step (B)(4). Refer to the detailed pilot testing
instructions in Section 5.3, 5.4, 5.5, or 5.6 for making adjustments.
1) First, leak testing of main valve components should be performed per Section 6.0.
2) Slowly increase system or test tank pressure to set point. See 5.1 for set pressure definition.
3) Verify that the main piston starts to open or pilot starts to exhaust at set point, as applicable.
a) The F100, F300, and F500 will start exhausting dome pressure at approximately 95% to 98%
of set pressure for ASME VIII applications, and at set pressure for DOT applications. Pilot flow
will be audible on gas flow, and result in a small trickle in liquid service. Flow will increase
significantly once the main piston opens.
b) The F200 pilot pops open at set pressure along with the main piston. Remain clear of main
valve outlet during testing, as piston will pop open.
PILOT VALVE TEST ARRANGEMENT
F300 PILOT SHOWN
OPTIONAL PILOT EXHAUST DETECTION
PORT ON F300 FOR FIELD USE
(1/8” NPT FITTING REQUIRED)
PILOT VALVE
ASSEMBLY
INLET
PRESSURE GAGE
DOME
PRESSURE GAGE
PRESSURE
SOURCE
MAIN VALVE
MOUNTING FACE
MAIN VALVE
FEED PORT,
1/4” NPT
PILOT
EXHAUST
PORT,
1/4” NPT
TEST PLATE
ASSEMBLY