Patent ID: 8800963

Claim:
A discharge valve assembly comprising: a valve casing having an intake bore that extends in a front-rear direction and along an axis of said valve casing and that opens frontward, an air chamber communicating coaxially with said intake bore, and a discharge aperture that extends radially and communicates with said air chamber; a metal intermediate ring disposed coaxially in said air chamber, said intermediate ring having a valve hole that extends axially and communicates with said air chamber, and at least one connecting aperture that extends radially and communicates with said discharge aperture and said valve hole; a base ring that retains said metal intermediate ring in said air chamber, and that is coaxially mounted on said valve casing; and an adjuster disposed coaxially in said base ring, extending frontward to be inserted into said valve hole, and movable relative to said base ring to adjust an air flow through said valve hole; wherein said metal intermediate ring further has a valve section that has said valve hole with a hole diameter gradually enlarged in a front-to-rear direction, and a hollow connection section that has an inner diameter greater than said hole diameter of said valve section, that communicates with said valve section and that has said connecting aperture; and said adjuster has a valve head that extends frontward and is inserted into said valve hole and that has an outer diameter gradually enlarged in the front-to-rear direction; and wherein said base ring has an annular retaining portion that is extended frontward and inserted into said air chamber and that abuts against a rear end of said metal intermediate ring, and a threaded portion that extends frontward and abuts against a rear end of said valve casing, and adjuster further having an adjusting portion that is axially movable relative to and threadedly inserted into said threaded portion, and a middle portion that extends frontward from said adjusting portion and connects to said valve head and that is fitted in said retaining portion.