Safety valve
AssigneeHerion-Werke KG
InventorHelmut Motzer
Life of this patent
Estimating the term…
Abstract
A hydraulically actuated safety valve includes two electromagnetically actuable pilot valves and is provided with two coaxial valve bodies movable in opposite direction towards each other. One of both pilot valves is designed as a proportional pressure differential valve and one of both valve bodies is provided with fine control notches. Thus, upon suitable actuation of the proportional pressure differential valve, the fine control notches clear a respective cross-section between the pump port and the working port and between the working port and the tank port to thereby allow a control of the speed and pressure buildup of a consumer such as e.g. a cylinder or a motor which is connected to the working port.
Claims7
A safety valve assembly, comprising:
- a valve housing defining a bore and having a fluid inlet port, a tank port and a working port connected to a fluid operated system;
- 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 at least one control piston connected to said working piston for regulating the flow of a pressure fluid between said fluid inlet port, said tank port and said working port wherein said working port is connectable to said tank port upon occurrence of a faulty switching;
- 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 piston of said working piston operatively connected with said proportional pressure differential valve being provided with fine control notches.
Dependencies are inferred from the claim text.