Patent ID: 8851109

Claim:
A detachable handle for adjusting a valve by rotation of a rotatable adjustment element of said valve about a rotation axis, said detachable handle comprising: a body, said body has a front side and opposite rear side and a circumferential gripping face, said front side is provided with an angular scale; a coupling element that is configured to be detachably and operably connectable to said rotatable adjustment element, with the coupling element being configured such that the detachable handle can only be coupled in one angular position to said rotatable adjustment element; at least a portion of said body along an edge of said angular scale is transparent or open so that an operator of the handle can see through said portion of said body when said detachable handle is coupled to said rotatable adjustment member; and said annular scale is provided in fixed relationship to the surface of said front side for co-rotation with said surface and with an edge of said angular scale placed substantially at an adjacent edge of said transparent or open portion.