초록 ▼

A metering valve includes a main valve and a pilot valve for operating the main valve. A low operating force pawl and ratchet system rotates a cam to open the pilot valve to initiate a cycle of operation. When the main valve is opened, a turbine wheel in the flow path rotates to measure flow. Turbin

A metering valve includes a main valve and a pilot valve for operating the main valve. A low operating force pawl and ratchet system rotates a cam to open the pilot valve to initiate a cycle of operation. When the main valve is opened, a turbine wheel in the flow path rotates to measure flow. Turbine rotation is transmitted to the cam through a reducing gear assembly and a lost motion connection in order to reclose the pilot and main valves after a predetermined volume of flow is measured.

대표청구항 ▼

[ What is claimed is:] [1.] A metering valve comprising:a housing defining a flow path including inlet and outlet regions;a main valve seat defined in said housing separating said inlet and outlet regions;a main valve member movable relative to said main valve seat between open and closed positions;

[ What is claimed is:] [1.] A metering valve comprising:a housing defining a flow path including inlet and outlet regions;a main valve seat defined in said housing separating said inlet and outlet regions;a main valve member movable relative to said main valve seat between open and closed positions;said housing defining a control chamber at the side of said main valve member opposite said seat;a restricted flow passage extending from said inlet region to said control chamber for normally pressurizing said control chamber to hold said main valve member against said main valve seat in said closed position;a pilot valve for selectively releasing pressure from said control chamber to free said main valve member for movement to said open position;actuating means for opening and closing said pilot valve;a turbine and gear assembly in said inlet region of said flow path, said turbine being rotatable in response to flow in said flow path; anda drive shaft extending from said gear assembly through said main valve seat and said main valve member and coupled to said actuating means in said outlet region of said flow path, whereby said drive shaft causes said actuating means to close said pilot valve in response to predetermined rotation of said turbine.