VP512A UNIT VENTILATOR VALVE
M18805
NEAREST OBSTRUCTION
ALLOW 3-3/8 IN. 9 86 MM) APPROX
FOR REMOVAL OF ACTUATOR
FROM VALVE
H- SWING RADIUS
(TO TOP OF STEM
BUTTON WITH
ACTUATOR REMOVED
AND VALVE CLOSED)
STEM
BUTTON
G
SWING
RADIUS
A
B
C
D
E
3/8
(10)
3-5/8
(92)
7/16
(11)
5-1/8
(130)
F
J
Fig. 2. Approximate dimensions in in. (mm)
1 PULL TAB OUT
TO RELEASE
STEM
2 DO NOT DISTURB
HEX HEAD
SETSCREW
3 LOOSEN
SETSCREWS (2)
ADJUSTMENT
4 LIFT ACTUATOR
NUT
FROM BONNET
M18804
Fig. 3. Actuator removal (when necessary).
CHECKOUT AND TESTING
With a 0 to 30 lb/in
2
(0 to 205 kPa) gage in the branch
line, vary branch line pressure. The difference between
the pressure at which the stem begins to move and the
pressure at full close off indicates the operating range.
The valve begins to close at 3 or 6 lb/in
2
(21 or 40 kPa)
and is fully closed at 8 or 11 lb/in
2
(5 or 76 kPa),
depending on the application.
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