Bistable mechanical latch for hydraulic valve - produces large latching force using simple springs located in bearing ring and recess in movable element

A bistable latching device for mechanical latching, e.g. of a hydraulic valve, is designed to provide relatively large end position latching forces using the simples possible spring shape, a relatively small latching stroke. and a compact construction. The movable element moves in its axial directions between end points determined by springs located in a bearing ring and in a recess in the element. The bearing ring is located in an annular slot in the housing. The element has a conical valve surface forming a seal with the valve seat in one end position. the springs are formed as rings of spring wire, and are arranged symmetrically about the axis. The bearing ring has axial and transverse play.