Patent ID: 6488258
Filing Date: 2002-12-03
Classification: F15B,F16K

Abstract:
Releasable check valve for very high system pressures having a valve housing (35) with a continuous receiving bore (36) located on a valve axis (37), having a closing element (50) which is prestressed in a closing direction by a closing spring (51) and is movable in a direction of the valve axis (37), having a poppet piston (70) which is actable upon at a piston collar (71) by a control pressure to release the closing element (50) and on both sides of the piston collar (71) is guided at end sections (79, 80) of at least approximately identical diameters in the direction of the valve axis (37), and having inserts (43, 55, 60) which are placed into the receiving bore (36) and into said inserts the end sections (79, 80) of the poppet piston (70) dip in order to guide said piston axially or in order to seal spaces upstream of their end sides, which said spaces are exposed to the system pressure, wherein the receiving bore (36) has essentially a same diameter in a region of the inserts (43, 55, 60) and between the inserts, and a spacer bushing (62) is arranged axially between the inserts (43, 55, 60), in which bushing the piston collar (71) is moveable separating two annular spaces (72, 73) on both sides thereof fluidically from each other.