High & Medium pressure pumps GA
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Max pressure: 10 MPaMax flowrate: 15 dm 3 /s (900 I/min) Bypass valve type GA is intended for use as a pressure-relief valve in hydraulic systems, oil circulation circuits, oilfiring systems, etc. The valve is intended for mineral oils and liquids with similarproperties and must not be used for water, steam, corrosiveliquids or the like. > Bypass valve type GA is direct-acting and is distinguished by its high speed during the opening process, enablingpressure surges in the event of sudden changes in volumetricflow to be kept at a low level. The valve features a built-in, automatically acting hydraulicpressure compensation device which endeavours to keepthe pressure rise as small as possible within the flow rate range area specified for the valve (cf. pressure rise in re-sponse to increasing flow for a purely spring-loaded valve)During the closing process, the pressure largely coincides with the pressure during the opening process. For fineadjustment of the valve characteristics, the valve is providedwith a throttling screw at the outlet which, upon delivery, is factory set and which does not usually require subsequentadjustment. > The bypass valve type GA is available in the followingversions: GAR with valve casing for threaded pipe connections GAS with valve casing for SAE-flanged pipe connections GAD with valve casing for DIN-flanged pipe connection > Valve casing - steel for types GAR and GAS- nodular iron for type GAD Spring casing - steel for sizes 012, 015, 020, 034- nodular iron for sizes 025, 040, 065, 100, 112 O-rings - Viton rubber Other parts - steel > R = Threaded pipe connectionsS = SAE-flanged pipe connectionsD = DIN-flanged pipe connections Size (size code according to type specification overleaf) Design specification (upon deviation from standard design - 0 indicatesstandard design) Design modification (1 - indicates original design) Valve spring (code according to type specification overleaf)or Special varian t (max. opening pressure determined by the variant) Example: GAS 04001 T040, valve with SAE-flanged connections dia. 40 mm in standard design with spring formax. 4.0 MPa opening pressure. > GA 1102.02 GB size="-3">

A bypass valve is to be installed in the outlet line as close aspossible to the unit which is to be protected against excessivelyhigh pressure by the valve. No components liable to block the flow and prevent the valve from releasing liquid when the openingpressure has been attained may be installed in the return linefrom the valve. Overflowing liquid should be returned to tank enabling the heat evolved in overflowing to be distributed amongthe largest possible liquid volume. Bypass valve type GA maybe mounted in any position. In order for the damping device incorporated in the valve to...

The curves show approximations of the valve characte-ristics set upon delivery at maximum nominally adjustableopening pressure with valve springs T008, T040, T075and T100 respectively. The pressure rise (accumulation) will not be more than 10% above the set pressure but willhave a minimum value of 0.2 MPa. >