Flow Safe F7000 SERIES User Manual

INSTALLATION, OPERATION, &
MAINTENANCE MANUAL
TITLE: F7000 / 8000 Series Rev. T
Pilot-Operated Safety Relief Valve Page 22 of 43
B. F300 (Piston-style) 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 plugs into valve body.
4) Install backflow preventer (BFP) O-ring onto BFP piston.
5) Insert BFP piston assembly into valve body.
6) 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.
7) Install backflow preventer 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 seal.
8) Assemble lock nut and proporational band screw seal onto proportional band screw.
9) Install the proportional band screw assembly into the valve body. Screw in clockwise until the
screw bottoms in the body, and then back out CCW 1-1/2 turns (also see Section 6.3 for band
screw adjustment). Tighten lock nut.
10) For the IM-construction pilot valve, insert inlet screen into the valve body.
11) Lightly lubricate lower sleeve seal with Dow Corning Molykote 33 or equivalent and install into
groove of sleeve.
12) Lightly lubricate upper sleeve seal and place onto the top of the sleeve. Install the seat into the
bottom side of the seat retainer nozzle, and assemble on top of the sleeve.
13) Lightly lubricate lower piston seal and install into groove of lower piston. Insert the lower piston
assembly into the sleeve until they are flush at the bottom. Then install the seat retainer / sleeve /
lower piston subassembly into the valve body until it bottoms. Check to ensure that all seals and
O-rings are correctly aligned. The PA screw cap can be used to verify proper fitup. Place the cap
on a flat surface, and then lower the pilot body with subassembly onto the cap and push down until
the assembly snaps into place and is solid.
14) Place the plug seal onto bottom of the sleeve. For IM-construction pilots, install plug O-ring and
backup ring onto the internal plug. For all pilots, screw the internal plug into the body until tight.
Make sure that the plug is very tight.
15) From the top, install spacer pin into the recess in the lower piston previously installed.
16) For high-pressure pilots (1481 - 6000 psig): Lightly lubricate upper piston seals and backup rings,
and assemble to upper piston in the relative position shown in Detail A, Page 20. Assemble the
adapter and adapter seal over the upper piston, making sure that it slides freely over the upper
seal.
17) For low-pressure piston-style pilots (286-1480 psig): Lightly lubricate upper piston seal and install
into groove of upper piston. Assemble diaphragm fastener seal, sense piston, sense piston O-ring,
sense piston backup ring, and diaphragm fastener to upper piston. Apply a small amount of Loctite
onto the fastener threads. Assemble the adapter and adapter seal over the sense piston.
Important: The sense piston backup ring must be on top of the O-ring, on the side nearest to the
spring. Tighten the diaphragm fastener tightly into the upper piston.
18) Install the upper piston assembly into body, making sure that it slides onto spacer pin properly.
19) Assemble diaphragm support ring seal and diaphragm support ring onto valve body.
20) Assemble spring and spring washers onto diaphragm fastener or HP upper piston, as applicable.
21) Install the bonnet over the spring / washers and onto the diaphragm support ring. Align the bonnet
and support ring so that the unthreaded through-holes in the support ring line up with the bolt holes
in the valve body, and the two small through-holes in the bonnet and support ring align and clear
the valve body. The vent / bug screen opening in the bonnet should face away from the main valve
mounting surface.
22) Install the four long bolts through the bonnet / support ring and into the valve body, and tighten.
23) Install the four short bolts through the bonnet and into the diaphragm support ring, and tighten.
24) Assemble the PA screw and lock nut into the top of the bonnet.
25) Attach the cap to the PA screw, but do not tighten.

Flow Safe F7000 SERIES Specifications

General

Brand	Flow Safe
Model	F7000 SERIES
Category	Control Unit
Language	English