DARV08-22 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 DARV08-22 blocks flow from 2 to 1 until sufficient pressure is present at 2 to force the poppet from its seat. The cartridge offers smooth transition in response to load changes in common hydraulic circuits.

NOTE：DARV08-22 may be used in cross-over relief applications (back pressure on 1 ) 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 spool 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: 221 bar（3200 psi）

Flow:The Performance Chart illustrates flow handling capacity at maximum setting for each spring range option. Pressure rise will vary with spring (range) and with setting within range due to flow forces.Consult factory for specific flow characteristic values.
Internal Leakage:0.25 cc/minute (5 drops/minute) max. to 85% of nominal setting
Crack Pressure Defined: 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 adjust the valve either lower or higher than the nominal ratings shown below.
Fluids:Mineral-based or synthetics with lubricating properties at viscosities of 7.4 to 420 cSt (50 to 2000 ssu)

  Temperature:-40℃～ 120℃

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

Cavity: