PRESSURE CONTROLS
CR10-28 Relief, Bi-Directional
DESCRIPTION
A screw-in, cartridge-style, direct-acting, differential area, poppet-type, bi-directional
relief valve.
OPERATION
The CR10-28 is a direct-acting, dual cross-over relief valve in a single cartridge
format. When pressure at either port exceeds the nominal setting value, fl ow will be
transmitted to the opposite port. Back pressure at either port will affect the nominal
setting of the opposite port on a 1:1 basis.
For correlation purposes, pre-set value will be measured at port
➁. Pressure at port
➀ will not exceed ±150 psi from the port ➁ value.
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: 240 bar (3500 psi)
Adjustable Pressure Range: 14 to 210 bar (200 to 3000 psi); Two springs;
Pressure is set at port
➁
Proof Pressure: 345 bar (5000 psi)
Reseat Pressure: 90% of crack (crack pressure at 0.95 lpm/0.25 gpm)
Maximum Difference for Crack Pressure in Both Directions: 10.5 bar (150 psi)
Flow Range: 60 lpm (16 gpm); see performance chart
Maximum Internal Leakage: when reseat to 80% of crack pressure: 33 ml/minute
(2 cu. in./minute
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: VC10-2; See page 9.110.1
Cavity Tool: CT10-2XX; See page 8.600.1
Seal Kit: SK10-2X-B; See page 8.650.1
USASI/ISO:
SYMBOLS
PERFORMANCE (Cartridge Only)
6.210.1
276/4000
207/3000
138/2000
70/1000
FLOW RATE lpm/gpm
PRESSURE RISE bar/psi
60
16
45
12
30
8
15
4
Flow Characteristic
➀ to ➁ or ➁ to ➀
32 cSt/150 ssu oil at 40°C
2
1
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DIMENSIONS
MATERIALS
Cartridge: Weight: 0.22 kg. (0.5 lbs.)
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and TFE backup
standard. Anodized aluminum knobs.
Standard Ported Body: Weight:
0.16 kg. (0.35 lbs.) Anodized high-
strength 6061 T6 aluminum alloy,
rated to 207 bar (3000 psi). Ductile
iron bodies available; dimensions
may differ. See page 8.010.1
Note: Orifi ce Disc should not be used
with this product.
TO ORDER
CR10-28__ - __ __ __ - __ - __ __ / __ __ __ __
Porting
Cartridge Only 0
SAE 6 6T
SAE 8 8T
3/8 in. BSP* 3B
1/2 in. BSP* 4B
*BSP Body; U.K. Mfr. Only
Seals
N Buna N (Std.)
V Fluorocarbon
Adjustment Option
1/4 in. Hex Allen Head A
1-1/2 in. Dia. Alum. Knob B
Option A w/ Cover Cap C
Factory Preset Non-Adjst. F
Factory Preset
Hidden Adjustment H
Option C
w/Lockwire Holes L
†
Adjustable valves will be
preset to approx. 50% of
spring max. potential.
CR10-28
6.210.2
Spring Range
24 14 to 168 bar
(200 to 2400 psi)
30 160 to 210 bar
(2300 to 3000 psi)
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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
23.5 2350 psi
Blue rectangles are links to other catalog pages.
