Safety valve
AssigneeHerion-Werke KG
InventorHelmut Motzer
Life of this patent
Estimating the term…
Abstract
A hydraulic safety valve which is controlled by two electromagnetically actuatable pilot valves is provided with two valve bodies movable in opposite direction towards each other and including control pistons for regulating the connection between one pump port, two working ports and two tank ports. Upon occurrence of a faulty switching, the valve bodies move into a hydraulically locked end position. One of both pilot valves is designed as a proportional pressure differential valve and the control pistons associated therewith are provided with fine control notches so that the valve can be proportionally controlled to thereby allow a control of the pressure buildup, the speed and direction of motion of a consumer which is connected to the valve.
Claims7
A safety valve assembly, comprising:
- a valve housing defining a bore and having a fluid inlet port, two tank ports and two working ports adapted for connection to a fluid operated system to allow alternate supply of a pressure fluid to the latter;
- valve means including two valve bodies movable in opposite direction towards each other in said bore of said housing, each of said valve bodies including a working piston and control pistons connected to said working piston for regulating the flow of a pressure fluid between said fluid inlet port, said tank ports and said working ports;
- and
- actuating means for displacing said valve bodies in said bore of said housing and including one pilot valve designed as a proportional pressure differential valve, said control pistons of said working piston which are operatively connected with said proportional pressure differential valve being provided with fine control notches.
Dependencies are inferred from the claim text.