Dynamic Response Analysis of the Main Plunger in A Two-stage On/Off Poppet Valve for the Digital Hydraulics Field

The necessity for greater energy conservation in hydraulic machinery ishighlighted by escalating fuel costs and heightened ecological awareness.Utilizing independent metering to enhance the energy utilization of hydraulicactuators is one effective strategy, yet the market is short on efficientreversible proportional valves that can perform this function. For handlingmodest flow rates up to 150 Liters per minute, the digital hydraulic methodutilizing fast direct operated on/off solenoid valves shows promise; however,solutions for managing larger flows remain vague. This research exploresthe application of pilot-operated solenoid valves in digital hydraulic systemsdesigned for substantial flow volumes. It establishes a model grounded inphysical principles to examine how various factors influence the valve reac-tion speed. A unique valve design was established, derived from an existingvalve but with a modified structure.The findings indicate that the pressure difference, viscosity of the fluidand pilot plunger dynamics are crucial determinants of the valve response time. Incorporating a stroke limiter proves significant in harmonizing theresponse times across valves with varying flow rates, while the traditionalmethods of deploying serial orifices is deemed unsuitable. A glance fromthe results shows that at a triangle P of 10 bar, the valve with an 8 mm attachedserial orifice has an opening response of 65 ms, while the stroke limited valveachieves 40 ms. This significant advantage slightly narrows at higher pres-sures, stabilizing at 100 bar. During closing, the stroke limiter is remarkably60% faster at 10bar, and both configurations settle at 40 ms at 200 bar.