Relief Valves

Symbol

Cross Section

Cavity Details

102

VH077

Description

All external surfaces are zinc plated and corrosion-pro-

of. All valve parts are made of high strength steel. Pop-

pet is hardened and ground to guarantee minimal wear

and to extend service life. Positive stop prevents sprin-

gs from going solid. Optional spring ranges to 300 bar

(4300 psi ). Adjustment screw has a positive stop which

prevents it from being backed out of the valve. Metric

cavity.

Technical Features

A screw-in, cartridge style, direct acting, poppet type, nor-

mally closed hydraulic relief valve. It’s typically used to

protect hydraulic components from pressure transients.

When the pressure at the Inlet (1) reaches the valve set-

ting, the valve starts to open to tank (2) and thanks to the

effect of the deflector integrated into the poppet it provi-

des a limited pressure rise. The cartridge offers excellent

response to load changes in hydraulic circuits requiring

low internal leakage as well as limited hysteresis. Innova-

tive design on internal dampening part guarantees great

stability.

METRIC Cartridge - 300 bar

Direct acting - Poppet type

RVB0.M24 Valve Series

Technical Data

103

Specications may change without notice.

Ordering Code

Maximum operating pressure 300 bar

Maximum flow 85 l/min

Setting Pressure See table below

Maximum internal leakage 0,25 cm

/min to 80% of nominal set point

External component treatment

Zn/Fe - standard (96h)

Zn/Ni (720h)

O-ring Temperature Range -30° C to 110° C (standard sealing NBR - BUNA-N)

Oil Temperature Range -30° C to 110° C

Pressure settings established @5 l/min

Reseat pressure nominal 90% of cracking pressure

Fluids Mineral - based or synthetics with lubricating properties

Viscosities 7,4 to 420 cSt

Filtration 20/18/15 ISO 4406 (maximum ltration admitted)

Orientation No restrictions

Installation torque 40-45 Nm (Hex. 27)

Tightening torque nut 10-12 Nm (Hex. 13)

Technical specications for characterization See page 480

Oil testing condition ISO VG 46 cSt

Seal kit code SK.054

Wire seals tamper proof Suitable design upon request

Weight 0,160 kg

Ordering Code

Relief Valves

Springs’ Graphs

104

p/Q performance

Flow (l/min)

Pressure (bar)

Spring = N (71 - 150bar)

Spring = Y (20 - 70bar)

RVB0.M24 Valve Series

Note: The performance chart illustrates flow handling capacity for each

spring bias options. p/Q curves are recorded at TOil = 40°C and 46 cSt

105

Specications may change without notice.

p/Q performance

Flow (l/min)

Pressure (bar)

Spring = G (216 - 265bar)

Spring = V (266 - 300bar)

Spring = B (151 - 215bar)

p/Q performance

Flow (l/min)

Pressure (bar)