INSTALLATION, OPERATION, &
MAINTENANCE MANUAL
TITLE: F7000 / 8000 Series Rev. V
Pilot-Operated Safety Relief Valve Page 23 of 41
25) Install vent / bug screen into the bonnet, and the inlet screen into the body.
26) Assemble the face seals to the external mounting face of the pilot body. The ‘IM’ style body has an
additional face seal at the inlet port.
27) The pilot valve is now completely assembled and ready to be set per Section 5.0.
28) If applicable, install lockwire and lead seal between PA screw cap, bonnet, and proportional band
screw. Repair tag may be attached to wire.
4.5 F500 PILOT VALVE (See Illustrations on Page 25)
A. F500 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 below.
5) Replacement soft goods are listed in Section 8.0 of this manual.
B. F500 Assembly
NOTE: Exercise care in handling softgoods, nozzles, and other sealing surfaces.
1) Confirm pressure setting and associated parts required.
2) Place the valve body in a vise.
3) Install pipe plug into the valve body.
4) Install backflow preventer (BFP) O-ring onto BFP piston.
5) Assemble BFP jam nut and seal onto BFP nozzle. For modified nozzle design with 00-2313-xx
O-ring on leading edge, install O-ring with light coat of lubricant to hold it in place in its gland.
6) Place BFP piston with O-ring into end of nozzle. Install BFP assembly into valve body until very
tight (conventional chamfered nozzle) or snug (O-ring-tipped nozzle), then tighten BFP jam nut so
as to crush the Teflon seal.
7) If the pilot includes the optional Set Point Indicator (SPI), install it as follows:
a) Lightly lubricate all O-ring seals.
b) Install SPI seat onto SPI pin.
c) Tighten SPI pin into SPI piston.
d) Install one SPI seal onto SPI piston.
e) Insert SPI pin and piston assembly completely into port in pilot body.
f) Install SPI pin seal, the other SPI seal, and SPI bushing seal onto SPI bushing.
g) Install the SPI bushing into the pilot body with the SPI pin protruding through it. Tighten the
bushing securely into the pilot body.
8) Lightly lubricate one O-ring seat and install onto seat retainer.
9) Install seat and seat retainer into pilot body from bottom.
10) Lightly lubricate feedback piston seal and install onto feedback piston.
11) Install feedback piston into body from top.
12) Install lower seat onto bottom of feedback piston and tighten securely with 7/16” hex driver.
13) Lightly lubricate the other O-ring seat and install into retainer.
14) Apply small amount of Loctite to threads of spindle. Install retainer securely onto spindle using
3/16” Allen wrench in bottom of spindle and a wrench on the OD flats of the retainer.
15) Install the spindle assembly up through the bottom of the pilot body. The spindle should slide freely
up and down through the feedback piston.
16) Place spindle spring onto top of feedback piston.
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