| 摘要 |
A draining-preventing device of a pneumatic-and-electromotive driving valve is disclosed. A driving shaft is installed at a center of a receiving tube of a joint and a lower end of the joint is buckled with a ball valve. The driving shaft and the ball valve rotates synchronously with the pneumatic-and-electromotive driving valve. A tightening sleeve is locked between the receiving tube and the driving shaft. A top surface of the tightening sleeve has an adjusting nut and the adjusting nut has a plurality of adjusting holes. When the draining-preventing washer becomes hard or deforms, so that that the force of the tightening sleeve is insufficient, and therefore, a gap is formed between the tightening sleeve and the joint. Thus water can be stop completely. Furthermore, by a supporting frame, a tray is supported at two sides and other portion is hollowed. If water drains out, it can be known immediately.
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