Hydraulisch betaetigter Teleskop-Hebebock

摘要

A hydraulically operated telescopic lifting jack comprises a piston carrying a ram-head which houses a non-return valve, a pressure relief valve and a fluid-release valve. The fluid release valve includes a slide member carrying a valve member and mounted in a guide. A portion of the slide member is of reduced diameter in relation to the guide and defines therewith a chamber which communicates with a fluid feed connection.