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A detachable handle for adjusting a valve by rotation of a rotatable adjustment element. The handle is provided with a body including a front side having an angular scale, an opposite rear side and a circumferential gripping face. The handle is also provided with a coupling element configured to det

A detachable handle for adjusting a valve by rotation of a rotatable adjustment element. The handle is provided with a body including a front side having an angular scale, an opposite rear side and a circumferential gripping face. The handle is also provided with a coupling element configured to detachably and operably connect to the rotatable adjustment element. At least a portion of the body along an edge of the angular scale is transparent or open so that an operator can see through the portion of the body. An assembly of a valve and the detachable handle is also provided. The valve is provided with a rotatable adjustment element for adjusting the valve. The valve has a face from which the rotatable adjustment element protrudes. This face is provided with a fixed marker.

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1. 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 angula

1. 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; andsaid 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. 2. The detachable handle according to claim 1, wherein said coupling element comprises a slot in said body that opens to said rear side. 3. The detachable handle according to claim 2, wherein said coupling element is disposed centrally in said body. 4. The detachable handle according to claim 1, wherein said detachable handle is made from a single piece of material. 5. The detachable handle according to claim 4, wherein the detachable handle is formed in a mold filling process. 6. The detachable handle according to claim 1, wherein said angular scale is placed around one or more curved or arc shaped slots that allow a view through said body while looking at the angular scale. 7. The detachable handle according to claim 1, wherein said circumferential gripping face has an average diameter in the range between 3 cm and 10 cm. 8. The detachable handle according to claim 1, wherein an extent of said body between the front side and the rear side is substantially smaller than an average diameter of said circumferential gripping face. 9. An assembly comprising: a valve, said valve being provided with a rotatable adjustment element that is rotatable about a rotation axis for adjusting the valve, said valve is provided with a face from which a portion of said rotatable adjustment element protrudes, said face is provided with a fixed marker; anda detachable handle comprising: a body said body has a front side and opposite rear side and a circumferential gripping face, a surface of said front side is provided with an angular scale;a coupling element that is configured to detachably and operably connect said detachable handle in one predetermined angular position to said rotatable adjustment element; andat least a portion of said body along an edge of said angular scale is transparent or open so that an operator of said detachable handle can see said fixed marker through said portion of said body when said detachable handle is coupled to said rotatable adjustment member; andthe angular scale is provided in fixed relationship to the surface of the front side for co-rotation with the front surface and with an edge of the angular scale placed substantially at an adjacent edge of the transparent or open portion. 10. The assembly according to claim 9, wherein said valve is a regulator valve that includes a differential pressure regulating facilities. 11. The assembly according to claim 10, wherein said regulator valve comprises an adjustable orifice, said orifice being adjustable by axially displacing a shaft that is concentric with and slidably received inside said rotatable adjustment element. 12. The assembly according to claim 11, wherein a shape and size of the rotatable adjustment member and the torque required to rotate the rotatable adjustment member are configured such that it is not possible for an operator to adjust the rotatable adjustment member without the use of a tool. 13. The assembly according to claim 11, further comprising an actuator that can be detachably connected to said regulator valve and operably connected to said shaft when said detachable handle is not attached to said rotatable adjustment element, and said actuator obscuring said rotatable adjustment member when said actuator is attached to said regulator valve.