Method of manufacturing a valve sleeve

Details Method of manufacturing a valve sleeve Method of manufacturing a valve sleeve

1984-04-02

1985-08-20

Goldberg, Howard N.

Textiles: cloth finishing

Expanding device for textile webs

Spreader

29557, 29558, 29DIG26, 72325, 72348, 72370, 251367, B21D 5300

Patent

active

045355193

ABSTRACT:
A method of manufacturing a valve sleeve which is combined with a valve rotor to form a hydraulic rotary valve comprises a first step of expanding one end of a cylindrical member, a second step of forming a plurality of axial grooves in the internal surface of the cylindrical member while leaving its opposite ends intact, and a third step of restoring the expanded portion to its original diameter which it assumes before the expanding step.

REFERENCES:
patent: 1714398 (1929-05-01), O'Bannon
patent: 1870970 (1932-08-01), Stevenson
patent: 2027922 (1936-01-01), McNaught
patent: 2079513 (1937-05-01), Lapsley
patent: 3591139 (1971-07-01), Bishop
patent: 4103407 (1978-08-01), Elizalde et al.
patent: 4166373 (1979-11-01), Braun
patent: 4292831 (1981-10-01), Simon
patent: 4419877 (1983-12-01), Alfano
patent: 4442579 (1984-04-01), Millard

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