Pressure Control Valves

RV52-26 — Relief, Pilot-Operated, High Pressure,
Spool-Type Valve
  Selection guide - similar valves.
  PDF file of this page.
  STP file for RV52-26.
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RV52-26 Valve
U.S. Patent 7,137,406

RV52-26 Valve symbol

A screw-in, cartridge-style, pilot-operated, two-stage, spool-type hydraulic relief valve,
intended for use as a pressure limiting device in demanding hydraulic circuits which
require fast response and low hysteresis at high operating pressures.

The RV52-26 blocks flow from 1 to 2 until sufficient pressure is present at 1 to force the
pilot relief off its seat, allowing the main stage to shift, opening 1 to 2. The cartridge offers
smooth transition in response to load changes in demanding hydraulic circuits
Note: The RV52-26 cannot be used in cross-over relief applications.

• Adjustments cannot be backed out of the valve.
• Adjustment options A, B and C: positive stops prevent springs from going solid.
• Hardened spool and cage for long life.
• Rapid, smooth response to pressure surges.
• Cost-effective cavity.

Operating Pressure: Port 1 - 345 bar (5000 psi); Port 2 - 103.4 bar (1500 psi)
Proof Pressure: 689 bar (10,000 psi)
Burst Pressure: 379 bar (20,000 psi)
Flow: 189 lpm (50 gpm) at max pressure
Internal Leakage: 197 ml/minute (12 cu. in/minute) max. to 85% of nominal setting
Crack Pressure Defined: bar (psi) evident at 7.6 lpm (2.0 gpm) attained
Relief Pressure Range: 41.4 bar (600 psi) to 345 bar (5,000 psi)
Reseat Pressure: Nominal 90% of crack pressure
Standard Spring Range: 41 to 345 bar (600 to 5000 psi). Due to manufacturing tolerances,
it may be possible to adjust the valve either lower or higher than the nominal rating shown.
If the valve is adjusted beyond the recommended maximum pressure range
for the F and H style adjuster options, the valve may not open to relieve system pressure.

Temperature: -54 to 107 °C (-65 to 225 °F) with Polyurethane 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: VC12-2; See page 9.112_2w
Cavity Tool: CT12-2xx; See page 8.600.1
Seal Kit: SK52-2X-B; See page 8.650.1


RV52-26 Flow-Pressure

RV52-26 Valve Dimensions


Cartridge: Weight: 0.35 to 0.40 kg (0.78 to 0.88 lb) depending on adjustment option. Steel with hardened work surfaces. Zinc-plated exposed surfaces. Polyurethane O-rings and back-up standard. Anodized aluminum knobs.

Ported Body:
Weight: 1.81 kg
(4.0 lb) Ductile Iron (code "D") standard, consult factory for weight, dimensions may differ. Rated to 345 bar (5000 psi);
See page 8.012_2w.

Adjustment Option Details:
See page 6.003.1

RV52-26 Ordering Chart

Selection guide - similar valves.
PDF file of this page. STP file for RV52-26 Request a quote.