Pressure Control Valves

CRV08-20 — Cross-Over Relief, Direct-Acting Valve Manifold
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CRV08-20 Valve

SYMBOL:
CRV08-20 Valve symbol

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
flow circuits, requiring low internal leakage.

OPERATION
The CRV08-20 manifold allows flow to pass through the separated 1 to 2 passages at low
pressure loss. If pressure in either passage exceeds the valve setting, flow 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. For example, 6.9 bar/100 psi back-pressure increases the
nominal setting by 6.9 bar/100 psi.
See valve model RV08-20, page 6.010.1 for cartridge specifications.

FEATURES
• Adjustments cannot be backed out of the valve.
• Adjustments prevent 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) maximum
Flow: 22 lpm (6 gpm) maximum; see performance chart for flow handling capacity at max.
   setting for each spring range option. Pressure rise will vary with spring (range) and with
   setting within range due to flow forces. Consult factory for specific flow characteristic values.
Internal Leakage: 0.25 cc per minute (5 drops/minute) max. to 75% of nominal setting
Crack Pressure Defined: bar (psi) evident at 0.95 lpm (0.25 gpm) attained
Reseat Pressure: Nominal 80% of crack pressure
Standard Spring Ranges:

Spring Model Code Spring Ranges
5 3.4 – 34.5 bar (50 – 500 psi)
9 3.4 – 62.0 bar (50 – 900 psi)
18 6.9 – 124 bar (100 – 1800 psi)
33 6.9 – 227.5 bar (100 – 3300 psi)
Temperature: -40° to 100°C (-40° to 212°F) with Buna seals;
   -26° to 204°C (-15° to 400°F) with Fluorocarbon 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; See page 8.650.1
Body Part Number: 7070160

PERFORMANCE:

CRV08-20 Flow-Pressure
  DIMENSIONS:

CRV08-20 Valve Dimensions

MATERIALS:

Cartridges: (2 required) Weight each:
0.23 kg (0.50 lb); Steel with hardened work surfaces. Zinc-plated exposed surfaces; Buna N O-rings and Fluorocarbon back-ups standard. Anodized aluminum knobs and caps.

Standard Ported Body:
Weight: 0.36 kg (0.80 lb); Anodized high-strength 6061 T6 aluminum alloy, rated to 207 bar (3000 psi).

Adjustment Option Details:

See page 6.003.1
Note: European manufactured version
may differ in design/dimensions.
Consult HydraForce Hydraulics Ltd.
  ORDERING CHART:

CRV08-20 Ordering Chart

Selection guide - similar valves.
PDF file of this page. Request a quote.