Walvoil’s DPX Series Provides Exceptional Controllability, Efficiency and Flexibility
The Walvoil DPX series is a family of open-closed center post-pressure compensated sectional valves designed specifically for mobile applications. This family of valves provides exceptional controllability, efficiency and flexibility for applications requiring up to 160 I/min (42 US gpm) flow rates. They are available in 3 sizes: DPX050, DPX100 and DPX160, and also available in high pressure configuration.
Flow Sharing Technology
The DPX control valve adds to the standard load sensing valve the benefit of Flow Sharing technology. Its patented compensator maintains the margin pressure as a constant pressure drop across the spool metering area, resulting in a flow to the workport dependent only on spool position. In case of flow saturation, the effective pressure drop across all spools is reduced equally. This results in proportional flow reduction at each section.
In case of flow saturation, the flow demand is higher than the maximum pump flow therefore the margin pressure is reduced according to the formula (dimensionless indication):
Since all spools have the same pressure drop across the metering area, all flows are reduced proportionally, allowing the operator to maintain control of all function, though at reduced speed of active functions.
Advantages & Options
- flow sharing technology permits multiple movements even with flow saturation
- energy saving on closed center system is produced only required flow and pressure by the actuators
- flow passage design allows high P & T flow rate in a standard valve dimension
- inlet section with unidirectional restrictor option suitable for dumping the pressure peaks from the LS line to the compensator + vice versa
- high pressure version stackable with standard one
- dedicated spools for special functions such as customized flow, back pressures and pressure control
- working section option with priority features in saturation conditions
