Methods and apparatus for adjusting a valve closure member

Details Methods and apparatus for adjusting a valve closure member Methods and apparatus for adjusting a valve closure member

1988-06-20

1989-07-11

Chambers, A. Michael

Valves and valve actuation

Rotary valves

Butterfly

251308, F16K 122

Patent

active

048464414

ABSTRACT:
Improved techniques are provided for adjusting the axial position of a rotatable valve closure element carrying an elastomeric annular seal with respect to a metallic valve body. An adjustable nut is threaded to the valve body and includes a recess for receiving a lower stem of the valve closure member. One or more interference members are spaced radially between the nut and the lower stem, and permit axial movement of the lower stem and thus the annular seals with respect to the valve body, while enabling the valve closure member to freely rotate during normal use of the valve. According to the method of the present invention, the lower stem is positioned within the recess of the nut, interference members are then fitted therebetween, the subassembly is then connected to the valve body and the shaft end interconnected with the valve closure member, and the closure member and seal are then centered with respect to the valve body by rotating the nut, which is then locked in position with respect to the valve body when the desired axial position has been achieved.

REFERENCES:
patent: 3752181 (1973-08-01), Mamis et al.
patent: 3961769 (1976-06-01), Crow et al.
patent: 3974855 (1976-08-01), Webb
patent: 4294428 (1981-10-01), Ohada et al.
patent: 4682758 (1987-07-01), Scobie et al.

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