Patent ID: 9360028
Filing Date: 2016-06-07
CPC Classification: F15B

Claim Text:
1. A hydraulic drive comprising: a pressure source; a tank; at least one single-actuated hydroconsumer that is actuatable from the pressure source to execute an extending motion into a working position counter to a permanent force; and a switching valve having a working force/pressure control function, the switching valve being configured to respond counter to spring force and depending on pressure and/or through flow volume, and the switching valve being operable to take a through flow position when the pressure source is cut off or switched off and to connect an admission chamber of the hydroconsumer at least via a bore with the tank for a return stroke of the hydroconsumer under the permanent force; wherein the hydroconsumer is stoppable during the return stroke hydraulically via the pressure source by a pressure pulse and/or a through flow volume pulse; and wherein the switching valve comprises a seat and a seat valve closing member with a sealing surface between the hydroconsumer and the tank, and further comprises, in a housing for the working force/pressure control function in the seat valve closing member, a through bore in communication with the pressure source, a piston loaded by the spring force of the switching valve with a closing projection that cooperates with the through bore, and an adjustable abutment for a spring generating at least a portion of the spring force, and wherein either the abutment is disposed in the seat valve closing member and movably guided in the housing with the seat valve closing member sealed to the outside in the housing, or the abutment is disposed directly in the housing separate from the seat valve closing member encapsulated in the housing in a sealing manner.