Pressure relief valve
First Claim
1. A fluid pressure relief valve comprising:
- a valve housing having an aperture through which a fluid flows;
a movably mounted valve element disposed in said aperture for pressure communication with said fluid;
a biasing arrangement which generates a bias force acting on said valve element to bias said valve element to seal said aperture; and
said valve element being in pressure communication with said fluid so that if an opening force, exerted on said valve element by fluid pressure communicated from said fluid, exceeds a counteracting threshold force, said valve element is moved to unseal said aperture, and said pressure communication with said fluid also producing a closing force on said valve element, less than and counter to said opening force, said closing force in combination with said bias force generating said threshold force.
1 Assignment
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Accused Products
Abstract
A fluid pressure relief valve has an aperture for the flow through of a fluid, the aperture being disposed between a fluid inlet and a fluid outlet. A movably mounted valve element is disposed for pressure communication with the fluid and is movable to unseal the aperture when an opening force exerted by the communicated fluid pressure on the valve element exceeds a counteracting threshold force. A biasing source provides a bias force for moving the valve element toward sealing the aperture. The valve element is disposed for pressure communication with the fluid such that a closing force less than and counter to the opening force is additionally exerted on the valve element by the communicated fluid pressure. This force in combination with the bias force generates the threshold force.
33 Citations
10 Claims
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1. A fluid pressure relief valve comprising:
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a valve housing having an aperture through which a fluid flows;
a movably mounted valve element disposed in said aperture for pressure communication with said fluid;
a biasing arrangement which generates a bias force acting on said valve element to bias said valve element to seal said aperture; and
said valve element being in pressure communication with said fluid so that if an opening force, exerted on said valve element by fluid pressure communicated from said fluid, exceeds a counteracting threshold force, said valve element is moved to unseal said aperture, and said pressure communication with said fluid also producing a closing force on said valve element, less than and counter to said opening force, said closing force in combination with said bias force generating said threshold force. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A patient breathing circuit comprising:
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an inspiration line and an expiration line adapted for connection to a patient; and
a pressure relief valve connected in at least one of said inspiration line and said expiration line, said pressure relief valve comprising a valve housing having an aperture through which a fluid flows, a movably mounted valve element disposed in said aperture for pressure communication with said fluid, a biasing arrangement which generates a bias force acting on said valve element to bias said valve element to seal said aperture, and said valve element being in pressure communication with said fluid so that if an opening force, exerted on said valve element by fluid pressure communicated from said fluid, exceeds a counteracting threshold force, said valve element is moved to unseal said aperture, and said pressure communication with said fluid also producing a closing force on said valve element, less than and counter to said opening force, said closing force in combination with said bias force generating said threshold force. - View Dependent Claims (10)
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Specification