Hydraulic piston with a cooling and lubricating gasket valve

A hydraulic piston (1) comprising:

• a cylindrical body (6) housed in a clearance in a cylinder (4),
• said hydraulic piston (1) being translatable in said cylinder (4) with which said hydraulic piston (1) forms a hydraulic chamber (5) of a variable volume,
• a first end of said hydraulic piston (1) having a compression surface (10) opening into the hydraulic chamber (5) for receiving pressure of a fluid (11),
• a second end of said hydraulic piston (1) having a piston support surface (8) for exerting a force on a transmission means (9),
• wherein said hydraulic piston (1) comprises:
• at least one cooling and lubricating gasket valve (2) positioned on a side of the compression surface (10) and in an extension of the cylindrical body (6) with respect to which the at least one cooling and lubricating gasket valve (2) moves in longitudinal translation over a short stroke, said at least one cooling and lubricating gasket valve (2) comprising, first, a piston-side axial valve surface (23) which has a circular flow closure contact surface (24) which comes into contact with a valve contact surface (26) on the compression surface (10), said at least one cooling and lubricating gasket valve (2) having secondly an external cylindrical valve surface (14) which exposes a sealing means (16) which comes into contact with the cylinder (4) and remain sealed, said at least one cooling and lubricating gasket valve (2) comprising, third, a chamber-side axial valve surface (15) which faces the hydraulic chamber (5);
• at least one intermediate fluid outlet chamber (29) formed within the circular flow closure contact surface (24) by the piston-side axial valve surface (23) and the compression surface (10);
• at least one flow calibration opening (27) which passes through the at least one cooling and lubricating gasket valve (2) mainly through an axial direction, the hydraulic chamber (5) communicating with the at least one intermediate fluid outlet chamber (29) via said at least one flow calibration opening (27);
• at least one valve stop-link (3) which connects the at least one cooling and lubricating gasket valve (2) to the cylindrical body (6), said at least one valve stop-link (3) allowing said at least one cooling and lubricating gasket valve (2) to approach said cylindrical body (6) to a point that the circular flow closure contact surface (24) contacts the valve contact surface (26), while said at least one valve stop-link (3) prohibits said at least one cooling and lubricating gasket valve (2) from moving away from said cylindrical body (6) more than a certain distance;
• and
• at least one valve return spring (30) which tends to move the at least one cooling and lubricating gasket valve (2) away from the cylindrical body (6).