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By certification 
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.
MATERIALS
Cartridge: Weight:0.23kg（0.50 lbs）；
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and polyester standard. Anodized aluminum knobs and caps.
BODY:Weight:
0.16 kg（0.35lbs）；
Anodized highstrength
6061 T6 aluminum alloy, rated to 240 bar（3500 psi）；
Ductile iron bodies available; dimensions may differ
Our advantage
1.We have many experience on OEM work.
2.We can customize special hardware as customer demand.
3.Technical service for assembling.
4.Variety types for selection, prompt deliver.
http://www.dahydraulics-valves.com/
