| 摘要 |
The wheel body (10) has a central hole (12) or similar to accommodate a valve spindle belonging to a valve housing and a position indicator (34'). The latter provides the valve wheel rotation position under an indicator wheel axially parallel with the spindle, and having position markings (33) indicating a number of rotation revolutions. The indicator wheel has cogs or similar which work in conjunction with at least one driver, which at each passage relative to the wheel moves it forward one position. The driver is stationary, and the position indicator wheel is enclosed in the valve wheel, following it in its movements. The indication unit contains a scale, index or similar (29,30) with one or more zero or limit positions. The driver is arranged ahead of the zero or limit positions, so that the position indicator wheel is moved from a position where the zero or limit position has come forward centrally in relation to the position indicator (23'). |
