6
2"
8.3
4.8
3"
8.3
4.8
4"
16.8
9.7
6"
22.1
12.8
8"
43.4
25.1
10"
72.7
42.0
12"
120.1
69.4
VAREC
3600B/3650B SerieS preSSure or vacuum relief valveS
INSTRUCTION, OPERATION AND MAINTENANCE MANUAL
CAUTION
The end of the pallet stem must engage the stem
guide chamber in the cover for proper seating and
valve operation.
3. To replace seat ring, proceed as follows:
a. for model 3600B, remove cover, spacer
(high setting), gaskets, pallet assembly,
screen retainer, screen and guide posts.
for model 3650B, remove cover, spacer
(high setting), gaskets, pallet assembly,
guide posts and adapter outlet.
b. remove seat ring and o-ring from valve
body. clean body and adapter mating
surface and o-ring groove.
c. install new o-ring into groove; ensure
that the o-ring stays properly in groove
while installing seat ring.
d. install new seat ring carefully to avoid
distortion. reassemble screen and
retaining ring (model 3600B) or adapter
(model 3650B) to secure seat ring.
ensure that seat is flush and level with
valve body.
e. reassemble guide posts.
f. place pallet assembly on valve body seat.
ensure pallet moves freely within guide
posts and rests flat on seat ring.
g.reassemble spacer, cover and gaskets.
TABLE 5 - MODEL 3600B PALLET LOADING (includes weight of pallet)
Valve size
Ounces of weight required
per ounce of setting
Ounces of weight required
per inch of wc setting
Weight tolerance: + 5%/- 5%
Setting tolerance: + 0%/- 10%
4. Seat ring repair:
a. Seat may be ground or ground and
lapped (in place) to improve seal. use a
lapping plate and medium valve grinding
compound, applying light pressure.
b. finish lapping with a fine compound.
avoid scoring or removing excessive
amounts of material.
c. clean all compound from valve parts.
d. Hand buff seat with a medium grade
'Scotch-Brite’ (#7447) pad and light oil.
CAUTION
Whenever the cover is removed and reinstalled,
the end of the pallet stem must engage the stem
guide chamber in the cover for proper pallet
seating and valve operation.
CALIBRATION (ADJUSTMENT)
To verify the settings, calculate the total
necessary weight using the Tables 5 and 6.
check this value against the actual weight of
the pallet assembly (including loading weights).
adjust loading weights as required.
2. To replace pallet insert proceed as follows:
a. remove cover and then pallet assembly.
b. remove nut from base of pallet stem.
remove retainer plate and insert.
clean all surfaces and threads. install
new insert, handling carefully to avoid
damaging insert or pallet.
c. reassemble pallet and place on seat of
valve body. ensure pallet assembly moves
freely within guide posts and rests flat on
seat ring.
d. reinstall cover.
CAUTION
During periods of freezing weather, extra
maintenance is required for Models 3600B and
3650B. Either remove the pallet or apply generous
portions of silicone grease to the pallet, seat ring
and guide posts. When using silicone grease,
inspect valves at least weekly. This procedure is
not required for the 'All-Weather' Models 3601B
and 3651B.
CAUTION
The end of the pallet stem must engage the stem
guide chamber in the cover for proper seating and
valve operation.
2"
8.3
4.8
3"
16.8
9.7
4"
22.1
12.8
6"
43.4
25.1
8"
72.7
42
10"
120.1
69.4
12"
179.9
104
TABLE 6 - MODEL 3650B PALLET LOADING (includes weight of pallet)
Valve size
Ounces of weight required
per ounce of setting
Ounces of weight required
per inch of wc setting
Weight tolerance: + 5%/- 5%
Setting tolerance: + 0%/- 10%
