Valve closing actuator

A valve for use in regulating flow of fluid through a conduit having a deformably resilient valve sleeve, said valve comprising

• a) a housing defining first and second cavities, each of said first and second cavities being substantially triangular in cross section;
• b) jaw member means within the housing comprising at least first and second opposing jaw members for at least partially encircling the conduit with the first and second jaw members disposed transverse to the conduit and for deforming the valve sleeve of the conduit with the conduit sandwiched between the first and second opposing jaw members, said jaw member means being movable between an open position with the first and second jaw members spaced apart a distance sufficient to permit flow of fluid through the conduit and a closed position with the jaw members urged together sufficiently to restrict the flow of fluid through the conduit, and
• c) inflatable diaphragm means having deflated and inflated configurations for controlling movement of the jaw member means between said open position with the diaphragm means in said deflated configuration, and said closed position, with the diaphragm means in said inflated configuration, said diaphragm means comprising first and second diaphragms disposed within said first and second cavities respectively, said first and second diaphragms substantially filling said first and second cavities respectively when the diaphragm means is in said inflated configuration.