Valve device, molding machine and method for controlling a valve device

Abstract

A valve device (10) having a check valve mechanism (20) having a valve rod (21) and a closing element (22) disposed on one end of the valve rod (21) and intended for the compressed-air supply to a consumer (11), the valve device (10) further having an actuation mechanism (30) having a hydraulic cylinder (31), the piston (32) of the hydraulic cylinder (31) being firmly connected to the valve rod (21) and being hydraulically driven within the cylinder casing (33) of the hydraulic cylinder (31) in order to actuate the check valve mechanism (20). A control mechanism (40) for controlling the piston movement and a measuring mechanism (50) for detecting the piston position is comprised, a proportional-valve mechanism (60), which is controllable by the control mechanism (40) as a function of the piston position, being connected to the hydraulic cylinder (31) in a fluid-conducting manner. A molding machine and method for controlling a valve device are also disclosed.

Dependencies are inferred from the claim text.