PRESSURE CONTROLS
PR08-32 Pressure Reducing/Relieving
DESCRIPTION
A screw-in, cartridge-style, direct-acting, spool-type, hydraulic pressure reducing/
relieving valve with internal pilot and internal spring chamber drain, designed to act
as a pressure-regulating device for secondary circuits. It is intended for use in stable
input fl ow circuits.
OPERATION
In its steady state, the PR08-32 allows fl ow to pass bidirectionally from ➁ to ➀, with
the spring chamber constantly drained at
➂.
On attainment of a pre-determined pressure at
➀, the cartridge shifts to block fl ow at
➁, thereby regulating pressure at ➀. In this mode, the valve also will relieve ➀ to ➂ at
a variable value over the set reducing pressure.
Note: Direct-acting PR series valves may not be suitable for some static load
applications. Consult factory.
FEATURES
• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Optional spring ranges to 152 bar (2200 psi).
• Hardened spool and cage for long life.
• Industry common cavity.
• Compact size.
RATINGS
Operating Pressure: 240 bar (3500 psi)
Proof Pressure: 390 bar (5700 psi)
Flow: 11.4 lpm (3 gpm) max.
Internal Leakage
➁ to ➂: 82 cc/minute (5 cu. in/minute) max. at 207 bar (3000 psi)
to 90% of nominal setting
Standard Spring Ranges (Reducing Function):
3.4 to 20.7 bar (50 to 300 psi);
10.4 to 41.4 bar (150 to 600 psi);
20.7 to 82.8 bar (300 to 1200 psi);
34.5 to 151.7 bar (500 to 2200 psi)
Temperature: -40 to 120°C with standard Buna seals
Filtration: See page 9.010.1
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of
7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1
Installation: No restrictions; See page 9.020.1
Cavity: VC08-3; See page 9.108.1
Cavity Tool: CT08-3XX; See page 8.600.1
Seal Kit: SK08-3X-BM; See page 8.650.1
USASI/ISO:
SYMBOLS
PERFORMANCE (Cartridge Only)
6.410.1
207/3000
172/2500
138/2000
103/1500
69/1000
7.5
2
0
Relieving Reducing
FLOW RATE lpm/gpm
PRESSURE RISE bar/psi
w/ Nominal 69 bar/1000 psi Setting
32 cSt/150 ssu oil at 40°C
3.8
1
35/500
11.4
3
11.4
3
3.8
1
7.5
2
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Setting in bar
†
(Blank) for Adjustable, or
Specify, for example:
M25 25 bar
M100 100 bar
Setting in psi
†
(Blank) for Adjustable, or
Specify, for example:
9.0 900 psi
21.0 2100 psi
TO ORDER
MATERIALS
Cartridge: Weight: 0.25 kg. (0.55 lbs.)
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and back-ups
standard. Anodized aluminum
knob.
Standard Ported Body: Weight:
0.27 kg. (0.60 lbs.) Anodized
high-strength 6061 T6 aluminum
alloy, rated to 207 bar (3000 psi).
Ductile iron bodies available;
dimensions may differ.
See page 8.008.1
Porting
Cartridge Only 0
SAE 4 4T
SAE 6 6T
1/4 in. BSP* 2B
3/8 in. BSP* 3B
*BSP Body; U.K. Mfr Only
Seals
Buna N (Std.) N
Fluorocarbon V
Spring Range
3 3.4 to 20.7 bar
(50 to 300 psi)
6 10.4 to 41.4 bar
(150 to 600 psi)
12 20.7 to 82.8 bar
(300 to 1200 psi)
22 34.5 to 151.7 bar
(500 to 2200 psi)
†
Adjustable valves will be preset to
approx. 50% of spring max. potential.
DIMENSIONS
PR08-32__ - __ __ __ - __ - __ __ / __ __ __ __
Ajustment Option
1/4 in. Hex Allen Head A
1-1/2 in. Dia.
Alum. Knobs B
Option A with Cover Cap C
Factory Preset Non-Adjst. F
Factory Preset;
Hidden Adjustment H
Option C w/
Lockwire Holes L
PR08-32
6.410.2
®
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