PRESSU
CR08-38 Bi-Directional Relief Valve, Vented
DESCRIPTION
A screw-in, cartridge-style, direct-acting, differential area, poppet-type, bi-directional
relief valve, intended for use as a pressure limiting device in demanding hydraulic
circuits.
OPERATION
The CR08-38 is a direct-acting, dual cross-over relief valve in a single cartridge
format. It blocks flow from 1 to 2 bi-directionally, with the spring chamber constantly
drained at 3.
On attainment of a pre-determined pressure at either 1 or 2, the poppet is forced from
its seat. Back pressure on port 3 will affect the nominal setting on a 2:1 basis.
NOTE: If pressure is applied simultaneously at port 1 and port 2, the pressure is
additive and may cause the valve to shift at a pressure lower than the pre set
pressure setting.
FEATURES
• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Hardened parts for long life.
• Industry common cavity.
RATINGS
Maximum Operating Pressure: 205 bar (3000 psi)
Adjustable Pressure Range: 68–205 bar (1000–3000 psi); Pressure is set at port
2
Proof Pressure: 345 bar (5000 psi)
Reseat Pressure: 80% of Crack; Crack: 0.96 lpm (0.25 gpm)
Maximum Difference for Crack Pressure in Both Directions: 20.7 bar (300 psi)
Flow Range: 30 lpm (8 gpm); See performance chart
Maximum Internal Leakage: When reseat to 75% of crack pressure: 0.4 cc/minute
(8 drops/minute maximum)
Cycle Limitations: Internal seal life is limited to 300,000 cycles in either direction
at maximum setting
Temperature: -40 to 120°C with Buna N 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:
6.230.1
248/3600
221/3200
193/2800
166/2400
138/2000
110/1600
83/1200
55/800
28/400
FLOW RATE lpm/gpm
PRESSURE RISE bar/psi
30.2
8
22.7
6
15.1
4
7.5
2
Flow Characteristic
1
to 2 ——; 2 to 1 - - - -
32 cSt/150 ssu oil at 40°C
2
3
1
HYDRAFORCE
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SYMBOLS
PERFORMANCE
(Cartridge Only)
RE CONTROLS
Blue rectangles are links to other catalog pages.
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:
10.0 1000 psi
23.5 2350 psi
TO ORDERMATERIALS
Porting
Cartridge Only 0
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
30 68 to 205 bar
(1000 to 3000 psi)
†
Adjustable valves will be preset
to approx. 50% of spring max.
potential, unless specifi ed.
DIMENSIONS
CR08-38__ - __ __ __ - __ - __ __ / __ __ __ __
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-Adj. F
Factory Preset;
Hidden Adj. H
Option C w/
Lockwire Holes L
CR08-38
6.230.2
®
HYDRAFORCE
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Cartridge: Weight: 0.14 kg. (0.30 lbs.)
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and TFE 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
Note: Orifi ce Disc should not be used
with this valve.
Blue rectangles are links to other catalog pages.
