Method of making an electrically-operated fluid valve having imp

Details Method of making an electrically-operated fluid valve having imp Method of making an electrically-operated fluid valve having imp

1990-10-11

1992-01-21

Cuda, Irene

Metal working

Method of mechanical manufacture

Valve or choke making

29418, 72416, B21D 5300

Patent

active

050817663

ABSTRACT:
A method of making an electrically-operated fluid valve for improving the metal-to-metal sealing of the valve needle to the valve seat, particularly of the rounded tip end of the needle to a frusto-conical depression in the seat. The method comprises applying a controlled axial compressive load to the seated needle to cause the annular zone of sealing contact between the needle and the seat to be coined.

REFERENCES:
patent: 3442491 (1969-05-01), Messerschmidt
patent: 3608171 (1971-09-01), Stradtmann
patent: 4248075 (1981-02-01), Whitley
patent: 4413393 (1983-11-01), Schils
patent: 4602413 (1986-07-01), Krauss et al.
patent: 4688312 (1987-08-01), Sasao et al.
patent: 4938451 (1990-07-01), Weaver

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