Unloading valves DAM

The valve is used in two-circuit systems consisting of a low-pressure (LP) and a high-pressure pump (HP) supplying the same consumer. The valve is used for pressure-dependent switching of the low-pressure pump flow to the tank. Before this changeover, both the LP and HP pumps deliver to the consumer. After switching over, the LP pump delivers to the tank with low loss and the consumer is only supplied by the HP pump.

Operating pressure up to 700 bar
Max. flow rate 40 l/Min
Porting NG 4 according Bieri Standard

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[Translate to EN:] Druckabschaltventil Typ DAM (500+)
Features Advantages
Poppet valve Good corrosion resistance
Directly controlled Poppet tight
Pressure adjustment possible over the entire pressure range High operational safety and reliable
switching

Design

  • Poppet valve
  • Directly operated
  • The unloading valve DAM is integrated together with a check valve into avalve block
     

Technical data

Hydraulic fluid mineral oil according to DIN 51524 (other fluids on request)
Fluid temperature range -20 to 120 °C
Ambient temperature range -20 to 120 °C
Viscosity range 10 to 400 mm²/s
Porting NG 4 according to Bieri standard
Max. operating pressure connection HP 700 bar
Max. operating pressure connection LP 150 bar
Pressure setting range connection LP 25 to 150 bar
Max. flow rate 40 l/min
Filtration (recommendation) according to NAS 1638 class 6 resp. ISO/DIN 4406 17/15/12
Pressure drop (LP->T) 3 bar (at 25 l/min and 32 mm²/s)
Weight see technical data sheet
Material cartridge body: free-cutting steel
cone: hardened steel
valve body: stainless steel