Unloading valves type DAM

  • Porting: NG 4
  • Operating pressure: up to 700 bar
  • Flow rate: up to 40 l/min

Features

  • Adjustable over the entire pressure range
  • Good corrosion resistance
  • High operational safety and reliable
    switching
  • Poppet tight
[Translate to EN:] Druckabschaltventil Typ DAM (500+)

Applications

The unloading valve is used with a low pressure (LP) and a high pressure pump (HP) in a dual-pressure-system. They both supply the same working port. The valve unloads the low pressure pump flow at a set pressure to the tank. Before the switchover both pumps supply the working port. After the switch over the low pressure pump flow is connected loss-free to the tank. The working port is supplied by the high pressure pump only.

Design

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