Air Admittance and Check Valve

摘要

An apparatus to allow or stop a flow into a piping system or an enclosed environment comprises (a) a housing having an upper flow passage and a lower flow passage; (b) a valve seat, wherein the valve seat is between the upper flow passage and the lower flow passage, wherein at least one opening is formed on the valve seat; (c) at least one rotary valve inside the housing, wherein each of the at least one rotary valve further comprises a main body and two guides mounted to the main body opposite to each other, and wherein the at least one rotary valve can move inside the upper flow passage and above the valve seat; and (d)at least two guide rails inside the upper flow passage for guiding each of the at least one rotary valve between an open position and a closed position.

主权项

1. An apparatus to allow or stop a flow into a piping system or an enclosed environment, comprising:
(a) a housing having an upper flow passage and a lower flow passage; (b) a valve seat, wherein said valve seat is between said upper flow passage and said lower flow passage, wherein at least one opening is formed on said valve seat, and wherein said at least one opening has an inner diameter; (c) at least one rotary valve inside said housing, wherein each of said at least one rotary valve further comprises a main body and two guides mounted to said main body opposite to each other, wherein said at least one rotary valve has a predetermined weight, wherein said main body of said at least one rotary valve is dimensioned to be between said inner diameter of said at least one opening of said valve seat and said inner diameter of said upper flow passage, and wherein said at least one rotary valve can move inside said upper flow passage and above said valve seat; and (d) at least two guide rails inside the upper flow passage for guiding each of said at least one rotary valve between an open position and a closed position, wherein said each of two guides of said at least one rotary valve are disposed in each of said two guide rails, and wherein said two guides move freely up and down in said two guide rails.