Safety valve
AssigneeHerion-Werke KG
InventorHelmut Motzer
Life of this patent
Estimating the term…
Abstract
A hydraulic safety valve which is controlled by electromagnetically actuated pilot valves includes two valve bodies movable in opposite direction towards each other for regulating the connections between a pump port, two working ports and two tank ports. Upon occurrence of a faulty switching, both valve bodies are moved in a hydraulically locked end position so that the safety valve can be operated again only after eliminating the malfunction. By coupling the safety valve with a proportional pressure reducing valve, the pressure buildup and the speed of a consumer which is connected to the safety valve can be controlled.
Claims9
A safety valve assembly, comprising:
- valve housing defining a bore and having a fluid inlet port, two tank ports and two working ports, with said working ports being 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 actuated by a pressure fluid and provided with axially spaced control pistons for regulating the flow of pressure fluid between said fluid inlet port, said working ports and said tank ports;
- and
- actuating means for displacing said valve bodies in said bore of said housing between a normal position and a switching position to allow said fluid inlet port to be alternately connected to one of said working ports while the other one of said working ports is pressure-relieved wherein upon occurrence of a faulty switching of said actuating means during switching between said normal position and said switching position, said control pistons maintain the previous connection between said fluid inlet port and said one working port while said other working port remains pressure-relieved.
A safety valve assembly, comprising:
- - a valve housing defining a bore and having a pump port, two tank ports and two working ports, with said working ports being 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 actuated by a pressure fluid and provided with three axially spaced control pistons for regulating the flow of pressure fluid between said pump port, said working ports and said tank ports;
- and
- - two pilot valves for displacing said valve bodies in said bore of said housing between a normal position and a switching position wherein in normal position of said valve means, said control pistons connects said pump port with one of said working ports while said other working port is connected with one of said tank ports, and wherein in switching position of said valve means, said control pistons connect said pump port with said other working port and said one working port is connected with the other one of said tank port, and wherein upon faulty switching, said control pistons connect said pump port with said one working port and said other working port with said one tank port.
Dependencies are inferred from the claim text.