Proportional pressure reducing valves type PDM - HAWE Hydraulik - #1

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Proportional pressure reducing valves type PDM The task of proportional pressure reducing valves in a hydraulic circuit is to maintain a rather constant outlet pressure (port A) despite a higher and changing inlet pressure (port P). They are used when an hydraulic circuit with a higher pressure level (primary side) is to supply another circuit with a lower pressure level (secondary side), without affecting the higher pressure in the primary circuit. There is a design related permanent leakage flow apparent at L, which has to be led back to the tank via a de-pressurized line. A reversal of the direction of flow is possible up to approx. 50% of Qmax. A by-pass check valve has to be provided for higher reversed flow. The pressure reducing valves size 11 and 21/22 feature an override compensation i.e. acting like a pressure limiting valve, if the pressure on the secondary side exceeds the set pressure e.g. due to external forces. Features and benefits: ■ With safety valve function Intended applications: ■ General hydraulics ■ Jigs ■ Test benches Nomen- Prop. pressure reducing valve clature: (directly controlled or piloted) Design: Individual valve for pipe connection Individual valve Manifold mounting Adjustment: Electro-proportional pmax p: 400 bar pmax A: 5 ... 350 bar Qmax: 120 lpm PDMP 2 PDM 4 G - 43 - G24 | Nom. voltage prop. solenoid 12V DC, 24V DC, controls via prop. amplifier or PLVC Pressure range Pressure ranges for pressure downstream at A Basic type, size, design Type PDM (pipe connection), size 11, 21, 22 Type PDMP (manifold mounting), size 11, 22 Type PDM, size 3 to 5 Pipe connection (G), manifold mounting (P) PDM Directly controlled Valve for pipe connection: Piloted p Manifold mounting valve: r 1 ii.y www.hawe.de | 2011 | 1