Danfoss PVG 100 Technical Information

Also see for PVG 100: Technical information Installation guide Service and parts manual Technical information Service manual

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Danfoss PVG 100 Technical Information Manual pdf 12 page image

PVG 100 with closed center PVPV / PVPVP / PVPVMIn load sensing systems the load pressure is led to the pump control via the LS connection (2 in thediagram below). When the work functions are in the spring neutral position the LS pressure is drained totank via the PVG valve. In this condition the pump control sets the displacement so that leakage in thesystem is compensated for, to maintain the set stand-by pressure (pump margin). When a main spool isactuated the pump control will adjust the displacement so that the set differential pressure between Pand LS is maintained.The PVG100 Inlet LS relief valve (1) is specifically designed to ensure a constant margin pressure acrossthe main spool, providing demanded regulated flow during maximum load pressure conditions. Thisrelief adjustment is critical when there are two or more functions being operated together. An incorrectlyadjusted Inlet relief could result in a vast reduction in regulated flow from the adjacent functions thatoperate at a lower load pressure. To accurately adjust the inlet LS relief, the pump standby pressure mustbe known in addition to the maximum operating load pressure.ExamplePressure comp pressure level 172 bar [2500 psi]LS standby pressure requirement that delivers the desired flow -20 bar [-290 psi]Maximum load pressure requirement 152 bar [2210 psi]Inlet relief pressure setting 152 bar [2210 psi]Optional PVPC with check valve option may be used in systems where it is necessary to operate the PVG100 valve by means of the electrical remote control without pump flow.For additional information about PVPC refer to publicaton 520L0344.Optional electrically actuated pilot shut off valve PVPP provides additional functional system safety byremoving pilot oil from the electrical actuation or hydraulic actuation system, disabling main spoolactuation. When the PVPP is used with the PVBZ P.O. check valve system it is possible to disable actuationduring mechanical actuation.PVG 100 closed center priority steering PVPVP moduleThe priority steering version of the PVPV will accommodate pump flows up to 250 l/min [66 US gal/min]and Control Flow (CF) up to 60 l/min [16 US gal/min] for dynamic steering systems. Additional return portis included with the PVPVP module.PVG 100 closed center PVPVM moduleThe mid-inlet version of the PVPV will accommodate pump flows up to 400 l/min [106 US gal/min]providing greater efficiency and flexibility when combined with standard and high flow work functionmodules.PVG 100 basic modules PVBIn the pressure-compensated basic module the compensator (9) maintains a constant pressure dropacross the main spool (11) - both when the load changes and when a module with a higher load pressureis actuated.Besides independent flow the other advantage of post-compensated work sections is the ability tocontrol multifunction operation when flow demand exceeds pump capacity. This means that all worksections will continue to function regardless of differences in their load and regardless of the pump flow.The flow relationships specified between functions will be maintained over the full flow range of thepump.The shock valves PVLP (10) with fixed setting and the suction valves PVLA on ports A and B are used forthe protection of the individual working function against intermittent pressure overload and/orTechnical Information PVG 100 Proportional Valve GroupPVG 100 function12 520L0720 • Rev EB • Jan 2014