PRESSURE CONTROLS
RV50-26 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 RV50-26 blocks fl ow from ➀ to ➁ until suffi cient pressure is present at ➀ to force
the piloting relief off its seat, allowing the main (second stage) spool to shift, opening
➀ to ➁.
The cartridge offers smooth transition in response to load changes in demanding
hydraulic circuits.
NOTE: The RV50-26 may not be used in cross-over relief applications (back
pressure on
➁).
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.
• Industry common cavity.
RATINGS
Operating Pressure: 345 bar (5000 psi)
Flow: The Performance Chart illustrates fl ow handling capacity at maximum setting.
Pressure rise will vary with setting due to fl ow forces. Consult factory for specifi c
fl ow characteristic values.
Internal Leakage: 115 cc/minute (7 cu. in./minute) max. to 85% of nominal setting
Crack Pressure Defi ned: bar (psi) evident at 7.6 lpm (2.0 gpm) attained
Reseat Pressure: Nominal 90% of crack pressure
Standard Spring Ranges: 27.6 to 345 bar (400 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: VC10-2; See page 9.110.1
Cavity Tool: CT10-2XX; See page 8.600.1
Seal Kit: SK50-2X-B; See page 8.650.1
USASI/ISO:
SYMBOLS
PERFORMANCE
(Cartridge Only)
6.152.1
345/5000
276/4000
207/3000
138/2000
70/1000
37.9
10
75.8
20
FLOW RATE lpm/gpm
PRESSURE RISE bar/psi
113.6
30
Flow Characteristic -
32 cSt/150 ssu oil at 40°C
➀➁
414/6000
HYDRAFORCE
.com
®
U.S. Patent
No. 7,137,406
Blue rectangles are links to other catalog pages.
DIMENSIONS
MATERIALS
Cartridge: Weight: 0.25 kg. (0.55 lbs.)
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Poly-urethane seals with
Fluorocarbon back-ups for
pressures over 240 bar (3500 psi).
Anodized aluminum knobs.
Ported Body: Weight: 0.54 kg.
(1.2 lbs.) Ductile Iron (code "D")
standard, consult factory for
weight, dimensions may differ.
Rated to 345 bar (5000 psi).
See page 8.010.1
TO ORDER
RV50-26__ - __ __ __ - __ - __ __ / __ __ __ __
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
Seals
Pressure on
P Only:
P Polyurethane
(Std.)
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
†
Adjustable valves will be
preset to approx. 50% of
spring max. potential.
Spring Range
50 27.6 to 345 bar
(400 to 5000 psi)
RV50-26
6.152.2
Porting
Cartridge Only 0
SAE 6 6TD
SAE 8 8TD
3/8 in. BSP* 3BD
1/2 in. BSP* 4BD
*BSP Body; U.K. Mfr. Only
®
HYDRAFORCE
HYDRAFORCE
.com
®
U.S. Patent No. 7,137,406
Blue rectangles are links to other catalog pages.
