PRESSURE CONTROLS

RV50-28 Relief, Pilot-Operated w/Reverse Check

DESCRIPTION

A screw-in, cartridge-style, pilot-operated, two-stage, hydraulic relief valve with

reverse flow check valve. It is intended for use as a pressure limiting device in

demanding hydraulic circuits which require fast response, low hysteresis, low leak-

age, low pressure overshoot and reverse free flow features.

OPERATION

The RV50-28 blocks flow from 1 to 2 until sufficient pressure is present at 1 to force

the pilot stage open, allowing the main stage to shift, opening 1 to 2.

The relief flow path is from 1 to 2. Reverse flow, from 2 to 1, occurs when the

pressure at 2 is at least 2.1 bar (30 psi) higher than at port 1.

FEATURES

• Adjustments cannot be backed out of the valve.

• Hardened spool and cage for long life.

• Fast response.

• Industry common cavity.

RATINGS

Operating Pressure Range: 344 bar (5000 psi)

Proof Pressure: 621 bar (9000 psi)

Burst Pressure: 241 bar (8000 psi)

Flow: 113.6 lpm (30 gpm) rom port 1 to port 2

Adjustable Pressure Range: 17 bar (250 psi) to 345 bar (5000 psi)

Internal Leakage: 0.5 ml/minute (10 drops/minute) max. to 80% of nominal setting

Crack Pressure Defined: bar (psi) evident at 7.6 lpm (2.0 gpm) attained

Reseat Pressure: Nominal 90% of crack pressure

Check Valve Mode Crack Pressure: 2.1 bar (30 psi)

Approximate Pressure Increment per Adjuster Turn: 99 bar (430 psi)/turn

Response Time: Relief Valve to Check Valve at 24 bar/53 lpm (3500 psi/14 gpm)

condition: 0.6 seconds

Response Time: Check Valve to Relief Valve at 24 bar/53 lpm (3500 psi/14 gpm)

condition: 0.3 seconds

Operating Temperature: with polyurethane seals: -54 to 107°C (-65 to 225°F)

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: SK10-2X-B; See page 8.650.1

ISO SYMBOL

PERFORMANCE

(Cartridge Only)

6.173.1

414/6000

344/5000

276/4000

138/2000

70/1000

FLOW lpm/gpm

PRESSURE bar/psi

114

Relief Valve Mode

32 cSt/150 sus oil at 40°C

207/3000

10.3/150

6.9/100

8.6/125

3.4/50

1.7/25

5.2/75

FLOW lpm/gpm

PRESSURE bar/psi

114

Check Valve Mode

32 cSt/150 sus oil at 40°C

HYDRAFORCE

.com

Blue rectangles are links to other catalog pages.

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

DIMENSIONS

MATERIALS

TO ORDER

RV50-28__ - __ __ - __ - __ __ / __ __ __ __

Porting

Cartridge Only 0

SAE 6 6T

SAE 8 8T

3/8 in. BSP* 3B

1/2 in. BSP* 4B

*BSP Body; U.K. Mfr. Only

RV50-28

6.173.2

Spring Range

50 17.2 to 344.7 bar

(250 to 5000 psi)

Seals

Pressure on

P Only:

N Buna N (Std.)

V Fluorocarbon

P Polyurethane

2.94

74.7

Options F or H

TORQUE:

25 ft-lbs

(33.9 Nm) max

Option A

Options C or L

3.54

89.9

2.27

57.6

Option B

Knob Dia.

Setting in bar

†

(Blank) for Adjustable, or

Specify, for example:

M52 52 bar (Minimum)

M100 100 bar

Setting in psi

†

(Blank) for Adjustable, or

Specify, for example:

30 3000 psi

HYDRAFORCE

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NOTE: Polyurethane seals required for operation

at pressures over 241 bar/3500 psi.

Cartridge:

Weight:

Option A B C,L F,H

lb 1.10 1.10 0.11 0.22

kg 0.23 0.23 0.24 0.10

Steel with hardened work surfaces.

Zinc-plated exposed surfaces.Buna N

O-rings and polyester elastomer

back-ups standard. Anodized

aluminum knobs.

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 8.010.1

Blue rectangles are links to other catalog pages.