PRESSURE CONTROLS

RV08-20 Relief, Direct-Acting Poppet

DESCRIPTION

A screw-in, cartridge-style, direct-acting, poppet-type, hydraulic relief valve intended

for lower ﬂ ow circuits requiring low internal leakage.

OPERATION

The RV08-20 blocks ﬂ ow from ➀ to ➁ until sufﬁ cient pressure is present at ➀ to force

the spring-opposed poppet from its seat.

For settings over 228 bar (3300 psi), see model RV58-20.

Note: The RV08-20 may be used in cross-over relief applications (back pressure

➁) 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.

• Optional spring ranges to 248 bar (3600 psi).

• Rapid response to pressure changes.

• Compact size.

RATINGS

Operating Pressure: 248 bar (3600 psi)

Flow: The Performance Chart illustrates ﬂ ow handling capacity at max. 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 75% of nominal setting

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

Reseat Pressure: Nominal 80% of crack pressure

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

adjust the valve either lower or higher than the nominal ratings shown below.

Temperature: -40 to 120°C with standard Buna 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: VC08-2; See page 9.108.1

Cavity Tool: CT08-2XX; See page 8.600.1

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

USASI/ISO:

SYMBOLS

6.010.1

276/4000

207/3000

138/2000

69/1000

11.4

22.7

FLOW lpm/gpm

PRESSURE RISE bar/psi

Flow Characteristic

32 cSt/150 ssu oil at 40°C

Spring Nominal Maximum Solid

Model Code Factory Rating Adjustment

5 3.45 – 34.48 bar (50 – 500 psi) 48.28 bar (700 psi)

9 6.90 – 75.86 bar (100 – 1100 psi) 103.45 bar (1500 psi)

18 17.24 – 158.62 bar (250 – 2300 psi) 200 bar (2900 psi)

33 17.24 – 248.28 bar (250 – 3600 psi) 303.45 bar (4400 psi)

HYDRAFORCE

.com

PERFORMANCE (Cartridge Only)

Blue rectangles are links to other catalog pages.

DIMENSIONS

MATERIALS

Cartridge: Weight: 0.23 kg. (0.50 lbs.)

Steel with hardened work surfaces.

Zinc-plated exposed surfaces.

Buna N O-rings and back-up

standard. Anodized aluminum

knobs and caps.

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

RV08-20__ - __ __ __ - __ - __ __ / __ __ __ __

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

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

Spring Range

5 3.45 to 34.48 bar

(50 to 500 psi)

9 6.90 to 75.86 bar

(100 to 1100 psi)

18 17.24 to 158.62 bar

(250 to 2300 psi)

33 17.24 to 248.28 bar

(250 to 3600 psi)

†

Adjustable valves will be

preset to approx. 50% of

spring max. potential.

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

Seals

Pressure on

P Only:

N Buna N (Std.)

V Fluorocarbon

Bidirectional

Pressure:

NC Buna N

VC Fluorocarbon

RV08-20

6.010.2

HYDRAFORCE

.com

Blue rectangles are links to other catalog pages.