Importance

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Abstract

A double acting and at the limit positions automatically reversing pressure intensifier. A case has a first bore hole and a second bore hole. A pressure intensifier piston slides in the first bore hole of the case and subdivides the first bore hole into two low pressure work spaces and is furnished with two flat control grooves at the outer circumference and with two cylindrical bore holes. Two high pressure pistons are solidly mounted to the case for sliding relative to and inside of the two cylindrical bore holes of the pressure intensifier piston. A check valve is disposed in the pressure intensifier piston and connects the two bore holes. A control slider is disposed in the case and furnished with two flat control grooves about at its middle region which connect to respective front faces of the slider via cross bore holes and axial bore holes in the control slider. A wide bypass groove is disposed on the outside of the control slider. A feed bore is disposed in the case and a discharge bore is disposed in the case. Each of a pair of bypass grooves in the second bore hole are connected to the feed bore. Each of a pair of bypass grooves in the second bore hole are connected to the discharge bore. Another pair of bypass grooves are connected each to a low pressure work volume of the first bore hole.

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First Claim