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ADJUSTABLE PILOT OPERATED RELIEF VALVE ?POR75-3/4?0 pages
ADJUSTABLE PILOT OPERATED RELIEF VALVE
“POR75-3/4”
POR75-3/4
TANK
PORT
VENT
PORT
PRESSURE
PORT
POR75-3/4
FEATURES:
PRECISION GROUND HEAT TREATED SPOOL that assures long life.
STEEL BALL will not jam, lock or seize and will always open.
OPENING AND CLOSING of this relief valve is very accurate concerning repeatability and is smooth
and surgeless.
HOLES DRILLED CROSS-WISE allow the flow to gradually increase and decrease so that the change
from closed to open is stepless and smooth.
DAMPENING ORIFICE smoothes out pulsations caused by the poppet relief
SPECIFICATIONS:
MATERIALS:
Pressure rating 3000 psi (207 bar).
Rated for 0-30 gpm (0-114 lpm)
Weighs 5 lbs (2.3 kg).
30 Micron filtration recommended
Cast Iron Body
Buna N O’Rings
Heat Treated Steel Spool
POR75-3/4 – GENERAL INFORMATION:
The Brand, adjustable pilot operated relief valve maintains the same cracking pressure at low and high
flows. As the pressure setting is exceeded a poppet type relief opens and allows a small pilot supply of
fluid to escape a chamber at the end of the main spool. The escape of pilot supply causes the main spool to
shift and thus opens a passageway which allows the main volume of pressurized fluid to escape to tank
without passing over the poppet type relief. The higher the pump output the farther the spool shifts over to
enlarge the opening to tank.
DIMENSIONAL DATA (POR75-3/4): inches & [millimeters]
4.56" [115.9]
3.88" [98.4]
1.94" [49.2]
1.88" [47.6]
0.94" [23.8]
RELIEF
ADJUSTMENT
3/4" NPT
TANK PORT
3/4" NPT
PRESSURE PORT
Page F-4
4.48" [113.8]
1.91" [48.4]
2X Ø0.27" [Ø6.8]
1
4"
NPT PORT
IS PLUGGED
1.88" [47.6]
12-13
"
