Vacuum breaker device

Claim 2

A vacuum breaker device comprising: a. a body member having an axial bore tapering from a smaller to a larger diameter; b. a corrosion resistant plastic liner concentrically disposed within said axial bore and flared outwardly at the ends of the bore; c. an annular raised seat formed on the internal surface of the liner (b) intermediate the ends thereof; d. female holding means formed in the wall of the axial bore of the body member (a); e. male holding means formed on the external surface of the liner (b) opposite the female holding means, said male holding means and said female holding means being in interlocking engagement whereby said liner (b) is secured to the wall of the axial bore against axial and radial displacement therefrom; f. a plate member secured to the body member (a) adjacent the smaller diameter end of the axial bore therethrough, said plate having a bore axially aligned with said body member bore and having a passageway providing communication between the body member bore and the side of the plate opposed from the body member bore; g. a valve member seatable against the annular raised seat (c) and having a stem slidably extending through the axial bore of the plate member (f), said valve member being lined exteriorly with a plastic liner; and h. spring and follower means coacting with the stem of the valve member (g) yieldably biasing the valve against the annular raisEd seat (c).

Claim 3

The vacuum breaker device of claim 1 wherein the body member (a) includes a radially projecting flange secured thereto and adapted to be attached to a pipe or vessel flange such that the end of the plastic liner (b) at the larger diameter end of the axial bore of the body member (a) may be compressingly engaged between the body member and said pipe or vessel flange.

Claim 4

The vacuum breaker device of claim 1 wherein the plate member (f) is secured to the body member (a) such that the end of the plastic liner (b) at the smaller diameter end of the axial bore of the body member is compressingly engaged between the body member and said plate member.

Claim 5

The vacuum breaker device of claim 1 including additionally, a plastic bushing secured between the stem of the valve member (g) and the axial bore of the plate member (f).

Claim 6

A vacuum breaker device comprising: a. a body member having an axial bore tapering from a smaller to a larger diameter, the body member further having a radially projecting flange secured thereto and adapted to be attached to a pipe or vessel; b. a corrosion resistant plastic liner concentrically disposed within said axial bore and flared outwardly at the ends of the bore such that the end of the plastic liner at the larger diameter end of the axial bore of the body member (a) may be compressingly engaged between the body member and said pipe or vessel flange; c. an annular raised seat integrally formed on the internal surface of the liner intermediate the ends thereof; d. female holding means formed in the wall of the axial bore; e. male holding means formed on the external surface of the liner opposite the female holding means, said male holding means and said female holding means being in interlocking engagement whereby said liner is secured to the wall of the axial bore against axial and radial displacement therefrom; f. a plate member secured to the body member adjacent the smaller diameter end of the axial bore therethrough, said plate having a bore axially aligned with the bore of the body member (a), and having a passageway providing communication between the body member bore and the side of the plate opposed from the body member. said plate member being secured to the body member (a) such that the end of the plastic liner (b) at the smaller diameter end of the axial bore of the body member is compressingly engaged between the body member and said plate member; g. valve member seatable against the annular raised seat (c) and having a stem slidably extending through the axial bore of the plate member (f), said valve member being lined exteriorly with a plastic liner; and h. spring and follower means coacting with the stem of the valve member (g) yieldably biasing the valve against the annular raised seat (c).

Claim 7

A vacuum breaker device comprising: a. a body member having an axial bore tapering from a smaller to a larger diameter, the body member further having a radially projecting flange secured thereto and adapted to be attached to a pipe or vessel; b. a corrosion resistant plastic liner concentrically disposed within said axial bore and flared outwardly at the ends of the bore such that the end of the plastic liner at the larger diameter end of the axial bore of the body member (a) may be compressingly engaged between the body member and said pipe or vessel flange; c. an annular raised seat integrally formed on the internal surface of the liner intermediate the ends thereof; d. female holding means formed in the wall of the axial bore; e. male holding means formed on the external surface of the liner opposite the female holding means, said male holding means and said female holding means being in interlocking engagement whereby said liner is secured to the wall of the axial bore against axial and radial displacement therefrom; f. a plate member secured to the body member adjacent the smaller diameter end of the axial bore therethrough, said plate having a bore axially aligned with the bore of the body member (a), and having a passageway providing communication between the body member bore and the side of the plate opposed from the body member. said plate member being secured to the body member (a) such that the end of the plastic liner (b) at the smaller diameter end of the axial bore of the body member is compressingly engaged between the body member and said plate member; g. valve member seatable against the annular raised seat (c) and having a stem slidably extending through the axial bore of the plate member (f), said valve member being lined exteriorly with a plastic liner; and h. spring and follower means coacting with the stem of the valve member (g) yieldably biasing the valve against the annular raised seat (c).

Claim 8

The vacuum breaker device of claim 5 including additionally, a plastic bushing secured between the stem of the valve member (g) and the axial bore of the plate member (f).

Claim 9

The vacuum breaker device of claim 5 including additionally, a cap secured to the plate member (f) and enclosing the valve stem (g) and spring and follower means (h), said cap having at least one vent hole therein.