Patent ID: 6761186
Filing Date: 2004-07-13
Classification: F15B,F16K,Y10T

Abstract:
Seated-type valve (S) for an actuating differential cylinder (Z) of an electric disconnector (TS), comprising a housing (G) provided with a pump valve seat (S1) and a tank valve seat (S2), said housing (G) containing a slider closure element (7) defining a pump seat surface (E1) and a tank seat surface (E2) at locations between the pump valve seat (S1) and the tank valve seat (S2) of said housing (G), a differential cylinder port (8) located in said housing (G) between the pump valve seat (S1) and the tank valve seat (S2), a housing pump port (5) at a side of said pump valve seat (S1) and a housing tank port (15) at a side of said tank valve seat (S2), a separation actuation force generator (C1) for the slider closure element (7) which separation actuation force generator (C1) has a first pressure actuated area (F4) of smaller size than each valve seat (S1, S2) which said first pressure actuated area (F4) is permanently actuated by pressure in said housing pump port (5) generating a separation actuation force oriented in a direction in which said pump seat surface (E1) abuts at said pump valve seat (S1), and a switch-on actuator force generator (C2) provided with a second pressure actuated area (F3) of smaller size than each valve seat (S1, S2) and of different size than the size of said first pressure actuated area (F4) which second pressure actuated area (F3) selectively either is relieved from or is actuated by said pressure in said housing pump port (5) for generating a switch-on actuation force oriented in a direction in which the tank seat surface (E2) abuts at said tank valve seat (S2), characterised in that at least said separation actuation force generator (C1) comprises a piston (D1) which is slideably guided in an interior bore (23) of said slider closure element (7), that said interior bore (23) is actuable by said pressure in said housing pump port (5), and that the piston (D1) is designed for a mechanical co-action with said housing (G) without creating hindering lateral forces for the slider closure element (7).