Unloading valves, hydraulically controlled - BUCHER Hydraulics - #1

BUCHER

HYDRAULICS

• 250 bar, 30 l/min

• Separate ports for tank and pilot

drain

• ON/OFF difference unaffected by tank-line back pressure

• BUCHER cavity type AN

• Surface protection: - all external parts A3C to ISO 4042

This unloading valve is a screw-in car­tridge for the AN mounting cavity and uses the 3/4"-16 UNF mounting thread. When the pressure at control port 1 rises to the preset upper switching pressure, the valve unloads pressure at port 4 via port 3 to tank. When the pres­sure at 1 falls to the lower switching pressure, the valve closes the connec­tion 4 == 3 (see Ordering code for the ON/OFF pressure differentials that are

available). The valve simultaneously functions as a two-stage pressure relief valve that protects the pump. Because ports 2 and 3 are run back to tank sep­arately (= external drain), the ON/OFF difference (bar) is unaffected by any back pressure in port 3. For customers who manufacture their own manifold blocks or plates, we offer form tool sets for sale or hire. The GANA body with threaded ports is available for pipe-mounting applications.

DWPB-4N-4 i ₁

4

2

Reference: 400-P-379101-E-00/01.05

Replaces: D-41.10