| 摘要 |
The present invention relates to a variable valve capable of controlling the opening and closing of a gate according to the pressure of flowing gas. The variable valve comprises a housing having an opening hole perforated to allow gas to pass through; a gate, which is combined to a housing through a shaft to be rotatable and opens and closes the opening hole according to rotation; and a spring, which is combined to the shaft so that a first support unit being in contact with the gate and a second support unit fixed to the housing can be elastically twisted according to the rotation of the gate. The spring has two and more second support units. According to the present invention having the above-mentioned structure, the first support unit for supporting the gate is arranged between two second support units supported by the housing. Therefore, the elasticity of the spring is applied toward the center of the gate, so the gate is prevented from being twisted. |
