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VP531A,C PNEUMATIC TERMINAL UNIT VALVES
INLET TUBE 5/8 OR 7/8 IN. O.D.
(6 OR 22 mm) COPPER TUBE
VP531A,C NPT Threaded Valve
It may be convenient to remove the top and insert assembly
when installing the valve. If so, unscrew the bonnet nut and lift
the assembly out. When installation is complete, replace the
top and insert assembly and tighten the bonnet nut firmly
enough to compress the copper washer seal (35 to 45 ft-lb
torque).
VISE MAY SQUEEZE VALVE SEAT OUT OF
ROUND. IF VISE IS USED, GRIP ONLY THE
HEX NEXT TO PIPE BEING INSERTED.
Typical Operation
An increase in control air pressure to the valve acts to move
the valve stem downward, toward the closed position,
modulating flow through the valve.
95-7251EF–1
BONNET NUT
FLOW
Fig. 2. VP531A,C solder body connection.
EXCESS DOPE
PIPE SIZE
EFFECTIVE LENGTH
MAY BLOCK DISC
OFF VALVE SEAT
1/2 in.
3/4 in.
LOOSE CHIPS
WRONG – TOO
MANY THREADS
WRONG
VISE GRIPS HEX END NEXT TO PIPE
Fig. 3. Proper threaded valve installation practice.
AIR CONNECTION FOR 1/4 IN. O.D. (6mm) PLASTIC TUBING
COVER FASTENER
ADAPTER (OBTAIN
LOCALLY IF NEEDED)
COPPER CONNECTION 5/8 OR 7/8 IN. O.D. (16 OR 22mm)
When connecting the valve into the system, use pipe dope
sparingly and apply to the pipe threads only.
IMPORTANT
Do not allow pipe dope or other foreign material to
enter the piping where it could lodge under the valve
seat and prevent proper closing of the valve.
Use proper piping methods, when installing the valve to
prevent distortion of the valve body. See Fig. 3.
OF THREADS
1/2 in. (13 mm)
9/16 in. (14 mm)
RIGHT
VISE HOLDS PIPE
SECURELY
AGAINST TURNING
PARALLEL-JAW
WRENCH GRIPS HEX
OR FLATS NEXT TO PIPE
2
TERMINAL UNIT
SUPPLY
2 THREADS CLEAN –
MODERATE
AMOUNT OF DOPE
RIGHT – FULL
THREAD (SEE TABLE)
M16447
CONTROL
AIR
PRESSURE
VP531
SYSTEM
SUPPLY
C7992
Fig. 4. Typical operation.
C7988
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