Unloading valves type 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.
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Operating pressure
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up to 700 bar
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Max. flow rate
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40 l/Min
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Porting
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NG 4 according Bieri Standard
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Features
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Advantages
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Poppet valve
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Good corrosion resistance
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Directly controlled
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Poppet tight
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Pressure adjustment possible over the entire pressure range
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High operational safety and reliable
switching
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- Poppet valve
- Directly operated
- The unloading valve DAM is integrated together with a check valve into avalve block
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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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![[Translate to EN:] Druckabschaltventil Typ DAM (500+)](/fileadmin/_processed_/1/3/csm_dam500_30a1e06e0a.jpg "[Translate to EN:] Druckabschaltventil Typ DAM (500+)")