Switching valve operated proportional seat valve with momentum flowmeter

Mobile or stationary fluid power systems require no leak valves with proportional controllability. Following the developement of a proportionally controlled seat valve with feedback slots, authors have designed an electrohydraulic seat valve with a momentum flowmeter which compensates the flow fluctuation of the valve against load pressure changes. The flow control seat valve operated by a PWM switching valve controls flow rates of 80 L/min within 0.1s. The paper shows transient characteristics of the valve and its simulation results by bond graph analyses.