Pressure modifying system
First Claim
1. A method of modifying pressure in a fluid path including the steps of forming a restriction in the fluid path to control the flow of fluid in the path and venting the fluid path on one side of the restriction when a pre-determined pressure limit is exceeded, with the improvement of including the further steps of:
- sensing the fluid pressure on at least one side of the restriction;
generating a movement in response to the sensed pressure; and
applying the movement to varying the restriction to control the flow of fluid in the path.
1 Assignment
0 Petitions
Accused Products
Abstract
A pressure modifying valve for anaesthetic gas scavenging systems for connection between a high vacuum source such as a hospital building service and the outlet from a patient or anaesthetic machine. The valve comprises a housing divided by a partition into two chambers having inlet and outlet ports respectively. The partition has a flow restricting orifice controlled by a valve member which is supported on a diaphragm to be self adjusting in response to pressure in the chamber. On the patient side, the pressure in chamber is controlled by pressure relief valves which are similar and interchangeable. The valve is made inexpensively of plastics and is disposable before the plastics deteriorates or undesirable matter accumulates and affects the functioning of the valve.
5 Citations
15 Claims
-
1. A method of modifying pressure in a fluid path including the steps of forming a restriction in the fluid path to control the flow of fluid in the path and venting the fluid path on one side of the restriction when a pre-determined pressure limit is exceeded, with the improvement of including the further steps of:
-
sensing the fluid pressure on at least one side of the restriction;
generating a movement in response to the sensed pressure; andapplying the movement to varying the restriction to control the flow of fluid in the path. - View Dependent Claims (2)
-
-
3. A pressure modifying device comprising:
-
housing means forming a fluid path between an inlet port and an outlet port; a restriction means in the housing and forming a restriction of the fluid path; a chamber formed in the housing between the restriction means and one of the ports; and pressure relief valve means for venting the chamber when a predetermined pressure limit in the chamber is exceeded; with the improvement of actuating means sensitive to and movable in response to pressure in the housing on at least one side of the restriction means; the actuating means being connected to a part of the restriction means to control the restriction means in response to the sensed pressure. - View Dependent Claims (4, 5, 6, 7, 8, 9)
-
-
10. A pressure modifying device comprising:
-
a housing including a cylindrical body portion with an end cap closing each end of the body portion; partition means in the housing dividing its interior into first and second chambers; an inlet port communicating with the first chamber; an outlet port communicating with the second chamber; a flow restricting orifice formed through the partition means whereby a fluid path is formed comprising the inlet port, the first chamber, the orifice, the second chamber and the outlet port; valve means to vary the cross-section of the orifice; and pressure relief valve means for venting at least one of the chambers when a predetermined pressure limit in the chamber is exceeded. - View Dependent Claims (11, 12, 13, 14, 15)
-
Specification