INSTALLATION, OPERATION, &
MAINTENANCE MANUAL
TITLE: F7000 / 8000 Series Rev. T
Pilot-Operated Safety Relief Valve Page 17 of 43
4.3 F300 PILOT VALVE, DIAPHRAGM-STYLE (15-500 psig)
(See Illustration below)
A. F300 (Diaphragm-style) Disassembly
CAUTION: It is extremely dangerous to attempt to disassemble any valve while it remains in
service with incoming line pressure.
1) Remove the pilot valve from the main valve, or safely block the incoming pressure before
disassembling the valve and performing maintenance.
2) Unscrew the pressure adjustment (PA) screw cap from the PA screw. Loosen the lock nut.
3) Loosen, but do not remove the PA screw from the bonnet.
4) Further disassembly can proceed in the reverse order from the assembly instructions on Page 18.
5) Replacement soft goods are listed in Section 8.0 of this manual.
F300 PILOT VALVE ASSEMBLY – LP DIAPHRAGM-STYLE (up to 285 psig)
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