Patent ID: 6332475
Filing Date: 2001-12-25
Classification: F16K,Y10T

Abstract:
A stop valve to terminate the flow of liquid on the liquid passing from an inlet of the stop valve, through a valve seat, to an outlet discharging the liquid to a container, said stop valve terminating the flow on the liquid reaching a predetermined level in the container, said stop valve including a master valve diaphragm seatable on the valve seat to control the flow of liquid from the inlet to the outlet, said master valve diaphragm being controlled by a pilot valve diaphragm controlled by liquid level sensing means on the liquid passing through the stop valve into the container, wherein the master valve diaphragm and the pilot valve diaphragm enclose a common chamber when seated, and wherein the master valve diaphragm has a bleed from said inlet to apply inlet pressure to the common chamber when the master valve is seated to directly seat the pilot valve diaphragm against a second seat, and said liquid level sensing means includes a float and pushing means operatively connected between the float and said pilot diaphragm valve and extending through the second seat to directly unseat said pilot valve diaphragm in response to a low liquid level in said container to relieve pressure within the common chamber through at least one aperture in the pilot valve diaphragm and around at least a part of the pushing means and through the second valve seat.