PROPORTIONAL VALVE, IN PARTICULAR FOR A CAMSHAFT ADJUSTER
A proportional valve ( 1 ), including a piston guide sleeve ( 4 ) and a valve piston ( 3 ) that can be moved in the piston guide sleeve ( 4 ), and further including a check valve ( 13 ) arranged in a pressure medium inlet ( 10 ) to the proportional valve ( 1 ). According to the invention a proportional valve ( 1 ) is provided, in which the adaption of the check valve ( 13 ) to the proportional valve ( 1 ) is improved with respect to the prior art. This is achieved in that the check valve ( 13 ) is arranged in an annular gap ( 14 ) surrounding the piston guide sleeve ( 4 ) in a region of the pressure medium inlet ( 10 ).
1 . Proportional valve comprising: a piston guide sleeve, a valve piston that can move in the piston guide sleeve, and a check valve arranged in a pressure medium inlet to the proportional valve, the check valve is arranged in an annular gap surrounding the piston guide sleeve in an area of the pressure medium inlet.
2 . Proportional valve according to claim 1 , wherein the annular gap is limited by an insert-molded part at least partially surrounding the piston guide sleeve and a receptacle sleeve comprising at least one sub-region of the insert-molded part.
3 . Proportional valve according to claim 2 , wherein the receptacle sleeve has, on an axial end thereof, a receptacle gap that forms a sub-region of the annular gap and in which the check valve is inserted.
4 . Proportional valve according to claim 2 , wherein the piston guide sleeve provided with the insert-molded part is connected with a material-fit connection to the receptacle sleeve.
5 . Proportional valve according to claim 2 , wherein the piston guide sleeve provided with the insert-molded part is connected with a non-positive-fit connection to the receptacle sleeve.
6 . Proportional valve according to claim 1 , wherein the check valve is constructed as a spring sleeve with slots in an axial direction.
7 . Proportional valve according to claim 1 , wherein the check valve is produced from a metallic material.
8 . Proportional valve according to claim 2 , wherein the insert-molded part includes, on a outer lateral surface thereof, a stop that is active in a radial direction in an opening direction of the check valve.
9 . Proportional valve according to claim 2 , wherein the receptacle sleeve forms, on an inner lateral surface thereof, a stop that is active in the radial direction in a closing direction of the check valve.
10 . Installation method for a proportional valve with a piston guide sleeve, a valve piston that can move in the piston guide sleeve, and a check valve arranged in a pressure medium inlet to the proportional valve, comprising inserting the check valve into a receptacle gap of the receptacle sleeve forming a sub-region of the annular gap and then inserting the piston guide sleeve provided with the insert-molded part into the receptacle sleeve and connecting the piston guide sleeve to the receptacle sleeve.
11 . Proportional valve according to claim 2 , wherein the piston guide sleeve provided with the insert-molded part is connected with a positive-fit connection to the receptacle sleeve.