Valve for closing pipes under high liquid pressure

摘要

A valve for closing pipes under high liquid pressure, the valve element (16) of which can be raised from the valve seat (15) counter to the force of a spring (19) by means of a tappet (27), has the following construction: The liquid is in contact with a cylindrical section (24) of the valve element (16) in an annular space (17) surrounding the valve element (16) above the valve seat (15, 26). The valve element (16) rests against the valve seat (15) with only one edge (26); it tapers from this edge. The piston surface resulting from the taper (25) is compensated by a counter-surface (29) of the same size which is subjected to the pressure acting on the taper (25) via a pressure-compensating hole (31, 32, 34) in the valve element (16). In this valve, the hydraulic pressures are balanced in all possible cases, even where there is a blockage downstream of the valve. <IMAGE>