RV50-28 Relief, Pilot-Operated w/Reverse Check (RV50-28)

A screw-in, cartridge-style, pilot-operated, two-stage, hydraulic relief valve with reverse flow check valve. It is intended for use as a pressure limiting device in demanding hydraulic circuits which require fast response, low hysteresis, low leak-age, low pressure overshoot and reverse free flow features.

Product Operation

The RV50-28 blocks flow from 1 to 2 until sufficient pressure is present at 1 to force the pilot stage open, allowing the main stage to shift, opening 1 to 2.
The relief flow path is from 1 to 2. Reverse flow, from 2 to 1, occurs when the pressure at 2 is at least 2.1 bar (30 psi) higher than at port 1.

Product Features

 Adjustments cannot be backed out of the valve.
 Hardened spool and cage for long life.
 Fast response.
 Industry common cavity.

Product Ratings

Operating Pressure Range: 344 bar (5000 psi)
Proof Pressure: 621 bar (9000 psi)
Burst Pressure: 241 bar (8000 psi)
Flow: 113.6 lpm (30 gpm) rom port 1 to port 2
Adjustable Pressure Range: 17 bar (250 psi) to 345 bar (5000 psi)
Internal Leakage: 0.5 ml/minute (10 drops/minute) max. to 80% of nominal setting
Crack Pressure Defined: bar (psi) evident at 7.6 lpm (2.0 gpm) attained
Reseat Pressure: Nominal 90% of crack pressure
Check Valve Mode Crack Pressure: 2.1 bar (30 psi)
Approximate Pressure Increment per Adjuster Turn: 99 bar (430 psi)/turn
Response Time: Relief Valve to Check Valve at 24 bar/53 lpm (3500 psi/14 gpm) condition: 0.6 seconds
Response Time: Check Valve to Relief Valve at 24 bar/53 lpm (3500 psi/14 gpm) condition: 0.3 seconds
Operating Temperature: with polyurethane seals: -54 to 107°C (-65 to 225°F)
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

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