Plastic needle valve

Details Plastic needle valve Plastic needle valve

1991-01-29

1992-01-28

Walton, George L.

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

251215, 251327, 277110, 277121, 277190, F16K 4104, F16J 1520, F16J 1524

Patent

active

050837494

ABSTRACT:
A plug-type, rising stem needle or shut-off valve for controlling fluid flow comprises a valve housing forming a valve chamber with inlet and outlet ports connecting therewith. A bonnet member with a cylindrical passage joins with the valve chamber and opens to the exterior of the valve. A plug valve element is mounted in the chamber and adapted to be moved by an operating stem axially movable within the cylindrical passage. The stem includes a radially extending guide flange. For sealing about the operating stem and limiting the axial outwardly movement of the stem there is an assembly which includes a wall surface that defines a conical chamber at the outer end of the cylindrical passage. The conical chamber tapers from a large diameter at the axial outer end to a smaller diameter at the axial inner end. At the axial inner end of the conical chamber is a cylindrical counterbore carrying a stop ring which forms a radial shoulder for engaging the flange on the stem at a predetermined outer limit position. The stop ring has an axial outer end surface that defines a continuation of the conical chamber. A sealing ferrule is positioned in the conical chamber. The ferrule has a continuous radial outer surface which sealingly engages both the wall surface which defines the conical chamber and the axial outer end surface of the stop ring.

REFERENCES:
patent: 416058 (1889-11-01), Grob
patent: 1182359 (1916-05-01), Dies
patent: 3032310 (1962-05-01), Hansen
patent: 3145010 (1964-08-01), Karr, Jr.
patent: 3443789 (1969-05-01), Glasgow et al.
patent: 3512753 (1970-05-01), Weise
patent: 3753569 (1973-08-01), Bonomi
patent: 3938779 (1976-02-01), Benjamin
patent: 4558874 (1985-12-01), Williams et al.
patent: 4592534 (1985-06-01), Ueda et al.
patent: 4630629 (1986-12-01), Nimberger

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