采用倒关双密封设计，可带压更换上密封组件，整体阀盖暗杆设计，结构紧凑。
Use back seal design, can replace top seal parts under pressure. Entirety of non-rising bonnet design, have compact structure.
阀盖轴承和整体阀座轴承引导阀杆总成，实现与阀座的精确定位。
A cover bearing and integral seat bearing guide the stem assembly for precise alignment with the seat.
紫铜垫性能特点：金属平垫由整体金属经机加工制成，用于压力容器、塔、槽、阀盖等部位的密封。
Copper cushion performance characteristics: metal flat mat by the overall metal machining, the made for pressure vessels, tower, trough, the cover of the place such as the seal.
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