Kracht - Model SPV/SPVF - Pressure Relief Valves
From Transfer Gear Pumps
The direct spring, sliding piston Pressure Relief Valve SPV/SPVF is intended for inline mounting and is suitable to safeguard low pressure hydraulic circuits up to 20 (30) bars. The pipe connection is to be effected either by SAE-Mounting Surfaces (3000 psi) or by Whitworth Pipe Threads ”G“.
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Valve Construction
The SIiding Piston 2 is pressed against the Annu- Iated Area a by the Compression Spring 3 and separates the Pump Connection P from the Reservoir Connection R sealing the Bore d. As soon as the operating pressure p adjusted by the Set Screw 4, is reached the SIiding Piston 2 releases the oil flow to the reservoir. The Spring Chamber b is pressure compensated by the Bore c. During starting-up the valve the Spring Chamber b must be bleeded by the Bleeding Screw 5, (Hex. Socket Width: 4). The valve should preferably be installed in vertical fitting position with the pressure setting arrangement down. The pressure relief valves are available in four different pressure setting ranges because, due to their springrates, each of the compression springs can only cover a limited pressure setting range.
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