valve bonnet seal

基本解释

The valve bonnet may now be removed. There may be slight leakage as the backseat does not provide a drip-tight seal.
現在可以拆卸閥蓋。如果後座無法提供無滴漏密封，則會有輕微的泄漏。
As a result of continuous design improvements, Velan is offering live-loading of bonnet "take-up" bolting as a standard pressure seal valve feature.
由於不斷改進設計，Velan的“take-up”螺栓閥帽動負載成爲標準的壓力密封閥門的特點。
The same force tends to reduce the seal on the pressure side with the result that bonnet cavity and the valve stem packing are nearly always subjected to maximum pipeline pressure.
而壓力側以相同的力削弱了密封，這樣使閥蓋腔室和閥杆填料幾乎縂是承受最大琯道壓力。
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