Proportional valve with a variable performance curve

摘要

A proportional valve for a hydraulic dashpot, with a piston that slides back and forth on the end of a piston rod in a shock-absorbing cylinder. The piston is provided with pressure-sensitive valves for the exchange of fluid during suction and compression states and separates the cylinder into two compartments. Passages are provided for the fluid that applies pressure to the valves to flow through. Space that communicates with whichever compartment it faces and supplies regulating pressure to the particular shock-absorbing valve is provided on the side of the shock-absorbing valve that faces away from the passages. The piston is mounted on a control bolt. The control bolt has two valve seats and two bypass systems. One seat is associated with an electromagnetic spool accommodated in the first bypass system and chokes the fluid flowing through it. The other seat is accommodated in the second bypass system and associated with a tappet that slides back and forth inside the spool and controls the flow of fluid through the second bypass system. The pressurized space on the side of the shock-absorbing valve facing away from the passages communicates through the second bypass system with whatever compartment that happens to face it.