A proportional solenoid valve has a casing with a receiving chamber. A valve housing is received in the receiving chamber. A solenoid with a push rod is connected to the valve housing,SAFETY VALVES A piston is positioned in the valve housing so as to be slidable. At least one pressure spring is positioned at one end of the piston opposite the solenoid. The piston is displacable by the push rod of the solenoid against the force of the at least one pressure spring.Water Power Control Valves The receiving chamber has a longitudinal extension and a constant diameter along the longitudinal extension. Flanges are provided for connecting the valve housing to the casing and the solenoid.Instrumentation Ball Valves A proportional solenoid valve unit comprising: a casing with a receiving chamber; a valve housing received in said receiving chamber; a solenoid with a pushrod connected to said valve housing; a piston positioned in said valve housing so as to be slidable; at least one pressure spring positioned at one end of said piston opposite said solenoid; said piston displaceable by said pushrod of said solenoid against the force of said at least one pressure spring; said receiving chamber having a longitudinal extension and a constant diameter along said longitudinal extension; and
flange means for connecting said valve housing to said casing and said solenoid. In the inventive proportional solenoid valve unit the receiving chamber of the casing has a constant diameter along its longitudinal extension. Accordingly, this receiving chamber can be produced in a single manufacturing step, for example, by drilling. The receiving chamber has no steps or threads. Thus, the valve housing can be provided with a smooth outer wall that contacts in a sealing manner the inner wall of the receiving chamber of the casing. Additional sealing rings are no longer required. The sealing action is ensured by engagement between the inner wall of the receiving chamber of the casing and the outer wall of the valve housing. The connection of the valve housing to the casing and the solenoid is achieved with flange means that can be easily produced. The inventive proportional solenoid valve unit thus comprises only few components that can be manufactured inexpensively. Assembling the components does not require additional manufacturing or method steps. Accordingly, the inventive proportional solenoid valve unit can be manufactured and mounted extremely inexpensively and very easily.

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