Instructions / Assembly

®
ZURN WILKINS
1747 Commerce Way, Paso Robles, CA 93446 Phone:[phone] Fax:[phone]
5
www.zurn.com
The PV-RLF Pressure Relief Valve may be installed in any
position. The ow direction is shown below. Flow goes from the
narrow side to the wide side of the cast body.
Disassembly
Prior to disassembly, relieve all pressure in pilot system and
then remove the PV-RLF.
1. Secure valve body and turn the adjustment screw all the
way out.
2. Next remove 8 socket head screws around the pilot bell
using a 5/32” hex key. Remove the bell, the spring, and 2
spring discs.
3. Remove the spacer and remove small gasket from the
bottom of the spacer. Use a 12mm socket or adjustable
wrench on the diaphragm and plunger nuts to disassemble
the plunger/diaphragm assembly. Unscrew one end of the
stem.
4. At this point slide the plunger/diaphragm assembly
out of the valve spacer.
5. Use soft jaws or a towel and pliers to clamp the stem.
Be careful not to scratch the stem as this is an o-ring
surface. Use an adjustable wrench on the opposite nut
to remove the remaining plunger/diaphragm assembly.
6. The parts removed from the disassembled diaphragm
and plunger assembly are a plunger, small washer, 2
o-rings, 2 nuts, a medium washer, a large washer,
diaphragm, and lock washer.
7. Use a small pin or pick to carefully remove the o-ring
on the inside through hole of the spacer. Do not scratch
brass surface
8. After complete disassembly thoroughly clean and
inspect all components before reassembly. Replace
parts as necessary after inspection.
9. The pilot seat generally does not need to be removed,
but if after inspection it requires replacement it can be
removed with a 1-1/16” socket.
PV-RLF Valve
Reassembly
Reassembly of the PV-RLF is the reverse of disassembly.
1. Carefully install a new o-ring in the through hole of
the spacer.
2. Place the medium washer (with round outer edge
toward the diaphragm) on the side of the stem with
the chamfered tip.
3. Follow the washer by putting on a new o-ring, new
diaphragm, large washer (with the inner step against the
diaphragm), lock washer, and 5/16” (chamfered side
away from diaphragm) nut then hand tighten.
4. Slide the stem through the spacer with the diaphragm
assembly on the spacer side with a circular groove on
the top surface.
5. On the other side of the stem place the small washer,
o-ring, plunger (with the rubber facing away from the
spacer), and nut.
DIRECTION
OF
FLOW
INLET OUTLET
ITEM
DESCRIPTION
1
1/2" Relief Body
2
O-ring Buna Nitrile, NSF Listed
3
Relief Plunger Assy.
4
Diaphragm O-ring
5
5/16" Flat Washer
6
Relief Pilot Stem
7
O-ring, Buna Nitrile, NSF Listed
8
5/16" Internal Tooth Lock Washer
9
Spring Disc
10
Spring
11
Pilot Bell
12
3x8-16 Jam Hex Nut
ITEM
DESCRIPTION
13
3/8-16 Adjustment Bolt
14
Adjustment Cover
15
5/16-18 Diaphragm Nut
16
Relief Pilot Upper Diaphragm Disc,SS
17
10-32 X 1-1/2" Skt Hd Cap Screw, SS
18
Tag
19
Diaphragm
20
Relief Pilot Lower Diaphragm Washer
21
Relief Pilot Spacer
22
Sensing Hole Gasket
23
O-ring, Buna Nitrile, NSF Listed
24
Relief Pilot Seat
Maintenance (PV-RLF Valve)
6. Use adjustable wrenches to tighten the plunger and
diaphragm nuts, on stem through spacer.
7. Place small gasket on bottom of valve spacer.
8. Install the plunger assembly on to the body with the plunger
sitting on the valve seat. The small rubber gasket on the
plunger side of the spacer must cover the sensing hole on
the pilot body.
9. Place a spring disk on the stem, then the spring, another
spring disk and bell.
10. Insert socket head cap screws into pilot bell holes and
thread into valve body. Place model tag on the four screws
that straddle the body inlet. Tighten all screws in a cross
pattern.
11. Install adjusting screw by hand with jam nut. Set valve once
reinstalled into pilotry system. Refer to "Start-up" section on
page one for proper setting of relief pilot. For further assis-
tance or ordering replacement parts go to www.zurn.com
or call product support 855-663-9876.
Table 1
13
11
10
17
20
7
21
6
23
3
24
2
15
1
5
4
18
12
4
19
16
22
9
15
8
14
9