PRESSURE CONTROLS
CRV08-20 Cross-Over Relief, Direct-Acting Poppet
DESCRIPTION
The CRV08-20 cross-port relief uses two RV08-20 cartridges in an in-line plumbed
housing. It is typically used to protect a hydraulic cylinder or motor from load-induced
pressure surges. The cartridges used are screw-in, direct-acting, poppet-type valves,
intended for use in lower fl ow circuits, requiring low internal leakage.
OPERATION
The CRV08-20 manifold allows fl ow to pass through the separated ➀ to ➁ passages
at low pressure loss. If pressure in either passage exceeds the valve setting, fl ow will
cross over to the opposite passage.
Note: Back-pressure at the outlet port of the relief cartridges will increase the nominal
setting of the valve on a 1:1 basis (i.e. 6.9 bar/100 psi back-pressure increases the
nominal setting by 6.9 bar/100 psi).
See catalog page 6.010.1 for cartridge specifi cations.
FEATURES
• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Optional spring ranges to 228 bar (3300 psi).
• Rapid response to pressure changes.
• Compact size.
RATINGS
Operating Pressure: 228 bar (3300 psi)
Flow: The Performance Chart illustrates fl ow handling capacity at max. setting
for each spring range option. Pressure rise will vary with spring (range) and
with setting within range due to fl ow forces. Consult factory for specifi c fl ow
characteristic values.
Internal Leakage: 0.25 cc/minute (5 drops/minute) max. to 75% of nominal setting
Crack Pressure Defi ned: bar (psi) evident at 0.95 lpm (0.25 gpm) attained
Reseat Pressure: Nominal 80% of crack pressure
Standard Spring Ranges:
3.4 to 34.5 bar (50 to 500 psi);
3.4 to 62.0 bar (50 to 900 psi);
6.9 to 124 bar (100 to 1800 psi);
6.9 to 227.5 bar (100 to 3300 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
Seal Kit: SK08-2X-M (for cross-over relief application) (2 required)
Body Part Number: 7070160
USASI/ISO:
SYMBOLS
6.250.1
PERFORMANCE (Cartridge Only)
276/4000
207/3000
138/2000
69/1000
11.4
3
22.7
6
FLOW lpm/gpm
PRESSURE RISE bar/psi
Flow Characteristic
32 cSt/150 ssu oil at 40°C
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Blue rectangles are links to other catalog pages.
DIMENSIONS
MATERIALS
Cartridges: (2 Required) Weight:
0.23 kg. (0.50 lbs.) Steel with hard-
ened work surfaces. Zinc-plated ex-
posed surfaces. Buna N O-rings and
Fluorocarbon back-ups standard.
Anodized aluminum knobs and caps.
Standard Ported Body: Weight:
0.36 kg. (0.80 lbs.) Anodized
high-strength 6061 T6 aluminum
alloy, rated to 207 bar (3000 psi).
TO ORDER
CRV08-20
6.250.2
CRV08-20__ - 6T - __ - __ __ / __ __ __ __ - __ __ / __ __ __ __
__
Adjustment Option
A 1/4 in. Hex Allen Head
B 1-1/2 in. Dia. Alum. Knob
C Option A w/ Cover Cap
F Factory Preset Non-Adj.
H Factory Preset
Hidden Adj.
L Option C w/
Lockwire Holes
Porting
6T SAE 6
Seals
Bidirectional
Pressure:
NC Buna N
VC Fluorocarbon
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
Spring Range
5 3.4 to 34.5 bar
(50 to 500 psi)
9 3.4 to 62.0 bar
(50 to 900 psi)
18 6.9 to 124 bar
(100 to 1800 psi)
33 6.9 to 227.5 bar
(100 to 3300 psi)
Repeat
to supply setting
group if both
valves are not
to be set at the
same pressures.
†
Adjustable valves will be
preset to approx. 50% of
spring max. potential.
®
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Note: European manufactured version
may differ in design/dimensions.
Consult HydraForce Hydraulics Ltd.
