Caution: If cover will not press flat against body, stem assembly is crooked and damage can result.
警告：如果阀盖不压平在阀体上，阀杆就可能扭曲和损坏。
A cover bearing and integral seat bearing guide the stem assembly for precise alignment with the seat.
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。
Varying the amount of pressure accurately positions the stem assembly to open, close or modulate the valve as required.
压力的变化将精确定位阀杆总成，使得阀门实现所要求的启、闭或调节的操作。
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