| 摘要 |
There is disclosed an apparatus for manually locking a pilot valve in an in-service position, independent of an actuating, or pilot, fluid pressure, so long as such pilot fluid pressure is below a predetermined amount. The device includes a valve manipulating knob attached to the exterior end of the valving element for manually shifting the element from a normally closed position to the in-service position. The knob includes an L-shaped member which conforms to the contour of the knob, and is adapted to pivot toward the valve body and lock the valving element out in the "in-service" position, or the pilot "bypass" position. This pivotal member includes an indicating surface visible from the front when the valving element is locked in the "bypass" position. The knob locking member is to be used in conjunction with a frontfacing pressure gauge having a multi-colored face and a rotating disc thereon to indicate specific pressure ranges by displaying various colors through an aperture in the disc. By glancing at the position of the indicating surface and the color displayed, an operator can readily determine the functional position of a pilot valve controlled motor valve.
|
