Valve member and method of making such a member

Details Valve member and method of making such a member Valve member and method of making such a member

1990-11-21

1991-11-05

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

251368, 264255, 13754313, F16K 1506

Patent

active

050624520

ABSTRACT:
A valve member comprising a lower support portion and an upper seal portion. The support portion is made of a relatively rigid plastic and the seal portion is made of a relatively soft plastic. The two plastic portions are integrally merged to form a single piece valve member. The valve member may further include an upper support portion which is formed of a relatively rigid plastic and is integrally merged with the seal portion. The method of making the valve member using a mold in the shape of the valve member, comprises pouring the material forming one of the portions into the mold while in a liquid or molten state, and then pouring the material forming another of the portions into the mold in a liquid state onto the first portion. The two portions merge or diffuse along the interface between them and, when cured, form an integral unit. In an embodiment where a third portion is provided, the third portion, while the materials are in lqiuid state, is poured and becomes merged and integrated with the first two portions.

REFERENCES:
patent: 664146 (1900-12-01), Hackett
patent: 2233649 (1941-03-01), Stahl
patent: 2933284 (1960-04-01), Yocum
patent: 3331582 (1967-07-01), Ford
patent: 3408038 (1968-10-01), Scaramucci
patent: 3532115 (1970-10-01), Hodil
patent: 4345738 (1982-08-01), Ripert
patent: 4683910 (1987-08-01), Benson

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