PRESSURE CONTROLS

RV08-22 Relief, Differential Area Poppet

DESCRIPTION

A screw-in, cartridge-style, direct-acting, differential area, poppet-type hydraulic

relief valve for use as a pressure limiting device in more demanding hydraulic

circuits, requiring low hysteresis and low internal leakage.

OPERATION

The RV08-22 blocks ﬂ ow from ➁ to ➀ until sufﬁ cient pressure is present at ➁ to

force the poppet from its seat.

The cartridge offers smooth transition in response to load changes in common

hydraulic circuits.

NOTE: The RV08-22 may be used in cross-over relief applications (back pressure

➀) with the use of the “C” double back-up ring seal option. See Ordering Table.

FEATURES

• Adjustments cannot be backed out of the valve.

• Adjustment options A, B, and C: positive stops prevent springs from going solid.

• Hardened poppet and cage for long life.

• Optional spring ranges to 221 bar (3200 psi).

• Smooth response to pressure surges.

• Industry common cavity.

• Compact size.

RATINGS

Operating Pressure: 248 bar (3600 psi)

Flow: The Performance Chart illustrates ﬂ ow handling capacity at maximum setting

for each spring range option. Pressure rise will vary with spring (range) and with

setting within range due to ﬂ ow forces. Consult factory for speciﬁ c ﬂ ow

characteristic values.

Internal Leakage: 0.25 cc/minute (5 drops/minute) max. to 85% of nominal setting

Crack Pressure Deﬁ ned: bar (psi) evident at 0.95 lpm (0.25 gpm) attained

Reseat Pressure: Nominal 90% of crack pressure

Standard Spring Ranges: Due to manufacturing tolerances, it may be possible to

ﬁ eld-adjust the valve higher than the nominal ratings shown below.

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: VC08-2; See Page 9.108.1

Cavity Tool: CT08-2XX; See page 8.600.1

Seal Kit: SK08-2X-T; See page 8.650.1; SK08-2X-M (for cross-over relief application)

USASI/ISO:

SYMBOLS

PERFORMANCE

(Cartridge Only)

6.045.1

207/3000

172/2500

138/2000

103/1500

69/1000

7.5

15.1

FLOW RATE lpm/gpm

PRESSURE RISE bar/psi

Flow Characteristic

32 cSt/150 ssu oil at 40°C

22.7

35/500

30.2

HYDRAFORCE

.com

Spring Nominal Maximum Solid

Model Code Factory Rating Adjustment

4 3.4 – 27.6 bar (50 – 400 psi) 41.4 bar (600 psi)

7 6.9 – 62.1 bar (100 – 900 psi) 89.7 bar (1300 psi)

13 6.9 – 117.2 bar (100 – 1700 psi) 158.6 bar (2300 psi)

26 17.2 – 220.7 bar (250 – 3200 psi) 275.9 bar (4000 psi)

*35 17.2 – 248.3 bar (250 – 3600 psi) 275.9 bar (4000 psi)

*Spring Code 35 is available with factory pre-set (F and H) options only.

Blue rectangles are links to other catalog pages.

DIMENSIONS

MATERIALS

Cartridge: Weight: 0.22 kg.

(0.48 lbs.) maximum (some

models may weigh less). Steel

with hardened work surfaces.

Zinc-plated exposed surfaces.

Buna N O-rings and back-up

standard. Anodized aluminum

knob.

Standard Ported Body: Weight:

0.16 kg. (0.35 lbs.) Anodized

high-strength 6061 T6

aluminum alloy, rated to 207 bar

(3000 psi). Ductile iron bodies

available; dimensions may differ.

See page 8.008.1

TO ORDER

†

Adjustable valves will be

preset to approx. 50% of

spring max.

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 Adj. H

Option C w/

Lockwire Holes L

__RV08-22__ - __ __ __ - __ - __ __ / __ __ __ __

Porting

Cartridge Only 0

SAE 4 4T

SAE 6 6T

1/4 in. BSP* 2B

3/8 in. BSP* 3B

1/2 in. BSP* 4B

*BSP Body; U.K. Mfr. Only

Seals

Pressure on

P Only:

N Buna N (Std.)

V Fluorocarbon

Bidirectional

Pressure:

NC Buna N

VC Fluorocarbon

RV08-22

6.045.2

Spring Range

4 3.4 to 27.6 bar

(50 to 400 psi)

7 6.9 to 62.1 bar

(100 to 900 psi)

13 6.9 to 117.2 bar

(100 to 1700 psi)

26 17.2 to 220.7 bar

(250 to 3200 psi)

35 17.24 to 248.3 bar

(250 to 3600 psi)

HYDRAFORCE

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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

Note: Spring Code 35 is available with

factory pre-set (F and H) options only.

1,000 Hour

Salt Spray Coating G

Blue rectangles are links to other catalog pages.