Electrohydraulic clamping module

Electrohydraulic clamping module (M) for at least one hydraulic clamping element (V) of a tooling machine including at least one directional control valve (W) with leakage-free seat valve function in blocking position and being connected to a pump line and a return line (2, 3), at least one consumer line (4, 5) of said clamping element (V) being connected to the exit side of said directional control valve (W), at least one pressure regulating valve (D) for regulating said consumer line pressure at an adjustable value, said pressure regulating valve (D) being provided in a flow path from said pump line (2) towards said clamping element (V), and an electric pressure surveying sensor (S) for said regulated pressure being associated with said pressure regulating valve (D), characterized in that said pressure regulating valve (D) is a leakage-free operating seat valve (14) having a closure member (13) being movable in relation to a stationary valve seat (20), said closure member (13) being displaceable by means of a control piston (18) which itself is displaceable by means of said regulated pressure downstream of valve seat (20) and in closing direction of closure member (13) counter to a regulating force (K), and that said pressure surveying sensor (S) is actuated by said control piston (18) of said seat valve (14);

• said pressure surveying sensor (S) is an electric switch (E) having an actuating element (30) and a motion transmitting mechanical coupling (C) is provided between said control piston (18) and said actuating element (30).