VP525A,C PNEUMATIC RADIATOR VALVE
EXCESS DOPE
PIPE SIZE
EFFECTIVE LENGTH
OF THREADS
1/2 in.
1/2 in. (13 mm)
3/4 in.
9/16 in. (14 mm)
2 THREADS CLEAN –
MAY BLOCK DISC
MODERATE
OFF VALVE SEAT
AMOUNT OF DOPE
LOOSE CHIPS
WRONG
– TOO
RIGHT
– FULL
MANY THREADS
THREAD (SEE TABLE)
WRONG
RIGHT
VISE GRIPS HEX END NEXT TO PIPE
M16447
VISE MAY SQUEEZE VALVE SEAT OUT OF
ROUND. IF VISE IS USED, GRIP ONLY THE
HEX NEXT TO PIPE BEING INSERTED.
VISE HOLDS PIPE
SECURELY
AGAINST TURNING
PARALLEL-JAW
WRENCH GRIPS HEX
OR FLATS NEXT TO PIPE
Fig. 5. Proper threaded valve installation practice.
TYPICAL OPERATION
An increase in control air pressure moves the valve stem
toward the closed position, modulating the flow through the
valve.
CONTROL
AIR
PRESSURE
SYSTEM
SUPPLY
C7712
VP525
Fig. 6. Typical operation.
3
95-5544EF–1