Fluid flow control valves

Details Fluid flow control valves Fluid flow control valves

1977-01-24

1978-09-12

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264328, B29F 100

Patent

active

041138260

ABSTRACT:
A method of forming an injection moulded lining on a valve body comprises the step of defining a cavity having a main portion which when filled with lining material forms the desired lining, and an extension portion continuous with an edge of the main portion. Lining material is injected into the extension portion until the cavity is filled. Any sprues produced by the injection are on the tab formed by the material in the extension portion and not on the lining proper. Thus, there is no danger of damaging the lining as sprues are removed, and they do not cause local stress in the lining.

REFERENCES:
patent: 2411398 (1946-11-01), Wallace
patent: 2601700 (1952-07-01), Pinsky et al.
patent: 3376014 (1968-04-01), Buckley et al.
patent: 3407838 (1968-10-01), Boteler
patent: 3520026 (1970-07-01), Stidham et al.
patent: 3776989 (1973-12-01), Annis et al.

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