| 摘要 |
The invention relates to a gas flow control valve which comprises a valve body provided with an inlet and an outlet, a fixed member (14) and a rotatable member (17) in contact with one major surface of the fixed member, the members being apertured in order to control the flow of gas between the inlet and outlet. The gas valve is described by various arrangements including an electrically controllable automatic arrangement which provides a coupling system. One feature of the coupling system is a controllable coupling element (31) in the form of an electrically controllable element which is provided by a piezo electric bender arrangement. The piezo electric bender can be controlled by a temperature sensing circuit such that the amount of bend produced by the bender is proportional to the temperature sensed. |
