Patent ID: 8585010

Claim:
A valve, comprising: a handle placed above a body and connected directly or indirectly to a top portion of a stem protruding from the body, the handle moving vertically when rotated, thereby opening or closing a flow passage inside the body; a cap, into which the stem is inserted, and which surrounds a side of a top portion of the body and is allowed to move only vertically, the cap having a plurality of locking holes formed on a top portion thereof in a circular arrangement; the handle, having a vertical hole corresponding to the locking holes and a key hole extending coaxially with or perpendicularly to the vertical hole, the handle connected to the top portion of the stem to contact the top portion of the cap; and locking means provided in the vertical hole and the locking holes to lock the handle and the cap to each other, thereby limiting rotation of the handle, wherein the body has rotation-preventing means placed in the top portion which engages with the cap, wherein the rotation-preventing means prevents the cap from rotating, wherein a through hole is formed in the top portion of the stem, a pin is inserted into the through hole, and a bolt is screwed through a side portion of the handle to butt against the pin, so that a predetermined amount of play is allowed to the handle, and wherein a locked position is released using a master key, which is inserted through the key hole, thereby allowing the handle to be operated.