DARV08-20 Relief, Direct-Acting Poppet

DESCRIPTION

A screw-in, cartridge-style, direct-acting, poppet-type, hydraulic relief valve intended for lower flow circuits requiring low internal leakage.

OPERATION

The DARV08-20 ，blocks flow from 1 to 2 until sufficient pressure is present at 1 to force the spring-opposed poppet from its seat.

Note: The DARV08-20 may be used in cross-over relief applications (back pressure on 2 ) 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 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 specific flow characteristic values.
Internal Leakage: 0.25 ml/minute (5 drops/minute) max. to 75% of nominal setting
Crack Pressure Defined: Bar (psi) evident at 0.95 lpm (0.25 gpm)
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.
Reseat Pressure: Nominal 80% of crack pressure

Temperature: -40℃～ 120℃

Fluids: Mineral-based or synthetics with lubricating properties at
viscosities of 7.4 to 420 cSt (50 to 2000 ssu);

Cavity: