Unloading valves type DAM
- Porting: NG 4
- Operating pressure: up to 700 bar
- Flow rate: up to 40 l/min
- Adjustable over the entire pressure range
- Good corrosion resistance
- High operational safety and reliable
switching - Poppet tight
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.
- Poppet valve
- Directly operated
- The unloading valve DAM is integrated together with a check valve into a valve block
Hydraulic fluid
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mineral oil according to DIN 51524 (other fluids on request)
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Fluid temperature range
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-20 to 120 °C
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Ambient temperature range
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-20 to 120 °C
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Viscosity
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range 10 to 400 mm²/s
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Porting
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NG 4 according to Bieri standard
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Max. operating pressure connection HP
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700 bar
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Max. operating pressure connection LP
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150 bar
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Pressure setting range connection LP
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25 to 150 bar
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Max. flow rate
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40 l/min
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Filtration (recommendation)
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according to NAS 1638 class 6 resp. ISO/DIN 4406 17/15/12
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Pressure drop (LP->T)
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3 bar (at 25 l/min and 32 mm²/s)
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Weight
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see technical data sheet
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Material
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cartridge body: free-cutting steel
cone: hardened steel
valve body: stainless steel
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