Danfoss PVG 16 Service Manual

Also see for PVG 16 PVH/Covers: Service and parts manual Technical information Installation guide

Contents

Danfoss PVG 16 Service Manual Manual pdf 8 page image

Load sensing controlsThe LS control matches system requirements for both pressure and flow in the circuit regardless of theworking pressure. Used with a closed center control valve, the pump remains in low-pressure standbymode with zero flow until the valve is opened. The LS setting determines standby pressure.Typical operating curve00P101 968EPC settingFlowPressureQ maxLoad sensing circuitP101 967Most load sensing systems use parallel, closed center, control valves with special porting that allows thehighest work function pressure (LS signal) to feed back to the LS control.Margin pressure is the difference between system pressure and the LS signal pressure. The LS controlmonitors margin pressure to read system demand. A drop in margin pressure means the system needsmore flow. A rise in margin pressure tells the LS control to decrease flow.LS control with bleed orifice (do not use with PVG valves)The load sense signal line requires a bleed orifice to prevent high-pressure lockup of the pump control.Most load-sensing control valves include this orifice. An optional internal bleed orifice is available, for usewith control valves that do not internally bleed the LS signal to tank.Integral PC functionThe LS control also performs as a PC control, decreasing pump flow when system pressure reaches the PCsetting. The pressure compensating function has priority over the load sensing function.For additional system protection, install a relief valve in the pump outlet line.Load sensing system characteristics:• Variable pressure and flow• Low pressure standby mode when flow is not needed• System flow adjusted to meet system requirements• Lower torque requirements during engine start-up• Single pump can supply flow and regulate pressure for multiple circuits• Quick response to system flow and pressure requirementsService ManualPVG 16 and 32 Service Assembly/Disassembly GuideGeneral information8 | © Danfoss | November 2017 L1104530 | AX00000133en-US0106