PRESSURE CONTROLS
RV52-26 Relief, Pilot-Operated Spool
DESCRIPTION
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.
OPERATION
The RV52-26 blocks flow from 1 to 2 until sufficient pressure is present at 1 to
force the piloting relief off its seat, allowing the main (second stage) spool 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.
FEATURES
• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Hardened spool and cage for long life.
• Fast, smooth response to pressure surges.
• Cost effective cavity.
RATINGS
Operating Pressure: 345 bar (5000 psi)
Flow: See Performance Chart
Internal Leakage: 115 cc/minute (7 cu. in/minute) max. to 85% of nominal setting
Crack Pressure Defined: bar (psi) evident at 7.6 lpm (2.0 gpm) attained
Reseat Pressure: Nominal 90% of crack pressure
Standard Spring Range: 83 to 345 bar (1200 to 5000 psi)
Temperature: -40 to 120°C
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 9.112.1
Cavity Tool: CT12-2XX; See page 8.600.1
Seal Kit: SK52-2X-B; See page 8.650.1
ISO SYMBOL:
PERFORMANCE (Cartridge Only)
6.157.1
250/3625
200/2900
150/2175
100/1450
50/725
37.9
10
75.8
20
FLOW RATE lpm/gpm
PRESSURE RISE bar/psi
Flow Characteristic 1 to 2
32 cSt/150 sus oil at 40°C
113.6
30
151.4
40
189.3
50
HYDRAFORCE
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®
Blue rectangles are links to other catalog pages.
MATERIALS
Cartridge: Weight: 0.34 kg. (0.75 lbs.)
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 lbs.) Ductile Iron (code "D")
standard, consult factory for
weight, dimensions may differ.
Rated to 345 bar (5000 psi);
See page 8.012.1
TO ORDER
RV52-26__ - __ __ __ - __ - __ __ / __ __ __ __
Seals
Pressure on
P Only:
P Polyurethane
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-Adj. F
Factory Preset
Hidden Adjustment H
Option C with
Lockwire Holes L
RV52-26
6.157.2
P
Porting
Cartridge Only 0
SAE 16 (Ductile) 16TD
†
Adjustable valves will be
preset to approx. 50% of
spring max. potential.
DIMENSIONS
®
HYDRAFORCE
HYDRAFORCE
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®
Setting in bar
†
(Blank) for Adjustable, or
Specify, for example:
M83 83 bar
M200 200 bar
Setting in psi
†
(Blank) for Adjustable, or
Specify, for example:
12.0 1200 psi
29.0 2900 psi
Spring Range
50 83 to 345 bar
(1200 to 5000 psi)
Blue rectangles are links to other catalog pages.
