PRESSURE CONTROLS
RV12-26 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 RV12-26 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 RV12-26 cannot be used in crossover relief applications.
FEATURES
• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Hardened spool and cage for long life.
• Optional spring ranges to 241 bar (3500 psi).
• Fast, smooth response to pressure surges.
• Cost effective cavity.
RATINGS
Operating Pressure: 241 bar (3500 psi)
Proof Pressure: 420 bar (6090 psi)
Flow: See Performance Chart
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:
6.9 to 27.6 bar (100 to 400 psi); 13.8 to 110.3 bar (200 to 1600 psi);
31.0 to 206.9 bar (450 to 3000 psi); 34.5 to 241.4 bar (500 to 3500 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: SK12-2X-B; See page 8.650.1
USASI/ISO:
SYMBOLS
PERFORMANCE
(Cartridge Only)
6.156.1
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 to
32 cSt/150 sus oil at 40°C
113.6
30
151.4
40
189.3
50
➀➁
HYDRAFORCE
.com
®
Blue rectangles are links to other catalog pages.
DIMENSIONS
MATERIALS
Cartridge: Weight: 0.34 kg. (0.75 lbs.)
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and polyester
elastomer back-up standard.
Anodized aluminum knobs.
Standard Ported Body: Weight:
0.57 kg. (1.25 lbs.) Anodized high-
strength 6061 T6 aluminum alloy,
rated to 207 bar (3000 psi). Ductile
iron bodies available; dimensions
may differ. See page 8.012.1
TO ORDER
RV12-26__ - __ __ __ - __ - __ __ / __ __ __ __
Seals
Pressure on
P Only:
N Buna N (Std.)
V Fluorocarbon
†
Adjustable valves will be preset to
approx. 50% of spring max. potential.
Spring Range
4 6.9 to 27.6 bar
(100 to 400 psi)
15 3.8 to 110.3 bar
(200 to 1600 psi)
30 31.0 to 206.9 bar
(450 to 3000 psi)
35 34.5 to 241.4 bar
(500 to 3500 psi)
Porting
Cartridge Only 0
SAE 10 10T
SAE 12 12T
SAE 16 16T
1/2 in. BSP* 4B
3/4 in. BSP* 6B
1 in. BSP* 8B
*BSP Body; UK Mfr. Only
Setting in bar
†
(Blank) for Adjustable, or
Specify, for example:
M25 25 bar
M100 100 bar
Setting in psi
†
(Blank) for Adjustable, or
Specify, for example:
9.0 900 psi
23.5 2350 psi
RV12-26
6.156.2
®
HYDRAFORCE
HYDRAFORCE
.com
®
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-Adjst. F
Factory Preset
Hidden Adjustment H
Option C with
Lockwire Holes L
Blue rectangles are links to other catalog pages.
