Ball valve lock plate

Details Ball valve lock plate Ball valve lock plate

1990-07-18

1991-10-01

Walton, George L.

Valves and valve actuation

With means for blocking or disabling actuator

Released by non-valving actuator motion

70175, 70179, 70180, 70212, 137271, 137385, 251113, 251116, 251206, 251208, F16K 3502, F16K 510, G01M 1900

Patent

active

050526553

ABSTRACT:
There is described a lock plate assembly for use with a three-position ball valve. The valve has a body, a valve element disposed for rotation within the body, and a handle mounted for rotation upon the body for operation of (off) position, a second (test) position and a third (drain) position. The lock plate assembly includes a lock plate frame defining a first frame stop for the handle in the first position and a second frame stop for the handle in the third position, a slide latch defining a latch stop for the handle in the second position, the latch stop being mounted upon the frame for movement between a first latch position with the latch stop disposed to prevent movement of the handle to the third position, and a second latch position with the latch stop removed from the path of the handle, and a spring or the like for biasing the slide latch toward the first latch position.

REFERENCES:
patent: 508365 (1893-11-01), Bothwell
patent: 1380307 (1921-05-01), Capewell
patent: 2820676 (1958-01-01), Cleaves
patent: 3648970 (1972-03-01), Hartmann et al.
patent: 4208033 (1980-06-01), Kesterman
patent: 4741361 (1988-05-01), McHugh
patent: 4852610 (1989-08-01), McHugh
patent: 4890814 (1990-01-01), Thomas

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