5
2”
8.3
4.8
3”
16.8
9.7
4”
22.1
12.8
6”
43.4
25.1
8”
72.7
42.0
10”
120.1
69.4
12”
179.9
104.0
VAREC
SERIES 2010B/2020B/3500B PRESSURE AND VACUUM RELIEF VALVE
INSTRUCTION, OPERATION AND MAINTENANCE MANUAL
3. To replace pressure seat ring perform the
following:
a For Model 2010B, remove weatherhood,
screen, spacer ring, pallet assembly and
guide posts. For Model 2020B, remove
pressure cover, spacer (high setting),
gaskets, pallet assembly, outlet adapter,
and guide posts.
b. Remove seat ring and O-Ring from valve
body. Clean body, outlet adapter mating
surfaces and O-Ring Groove.
c. Install new O-Ring into groove; insure
that the O-Ring stays properly in groove
while installing seat ring.
d. Install new seat ring carefully to avoid
distortion. Reassemble guide posts
(2010B) or outlet adapter (2020B) to
secure seat. Ensure that seat is flush
and level with valve body.
e. Reassemble guide posts (2020B).
f. Place pallet assembly on valve body
seat. Ensure pallet assembly moves
freely within guide posts and rest flat
on seat ring.
g. Reassemble remaining parts in reverse
order.
CAUTION
The end of the pallet stem must engage the stem
guide in the weatherhood and/or the stem guide
chamber in the cover(s) for proper seating and
valve operation.
4. To replace vacuum seat ring perform the
following:
a. Remove vacuum cover, spacer (high
setting), gaskets, pallet assembly,
screen retainer, screen and guide posts.
b. Remove seat ring and O-Ring from valve
body. Clean body mating surface and
O-Ring groove.
5. 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 weatherhood and/or cover(s)
is removed and reinstalled, the end of the
pallet stem must engage the stem guide in the
weatherhood and/or the stem guide chamber
in the cover(s) for proper seating and valve
operation.
c. Install new O-Ring into groove; insure
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 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 assembly moves freely
within guide posts and rests flat on seat
ring.
g. Reassemble spacer, cover and gaskets.
CAUTION
The end of the pallet stem must engage the stem
guide chamber in the cover for proper seating and
valve operation.
CALIBRATION
To verify setting, calculate the total necessary weight using the table below. Check this value
against the actual weight of the pallet assembly (including loading weights). Adjust loading
weights as required.
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%