而且由于阀杆的楔形块与燕尾槽的作用，对阀门增加了强制密封力，增大了密封比压，实现双向密封。
And because the wedge block and the role of the dovetail groove of the stem, the valve increases the forced sealing force, increases the sealing pressure ratio, the two-way sealing.
大部分闸阀是采用强制密封的，即阀门关闭时，要依靠外力强行将闸板压向阀座，以保证密封面的密封性。
Most of the valve is sealed using force, that the valve is closed, forced to rely on external ram pressure to the valve seat to ensure the sealing surface of the seal.
实际生产应用表明，钢骨架大间隙径向外抱式强制密封装置引管方便，胶圈使用寿命长，可大大提高生产效率。
Actual application of production shown that steel framework radial sealing in big gap possesses conveniently draft pipe and long life of rubber ring, and can greatly increase production...
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