阀瓣与阀座为软密封，密封性能好，无泄露。
Valve flap and valve seat for the soft seal, seal performance, no leakage.
螺旋通道的端面是焊接密封的，密封性能好，结构可靠。
The end surface of spiral channel is sealed by welding, therefore the sealing performance is good with reliable structure.
双向密封，可选用多种形式阀座，密封性能好，可靠性高。
Two way sealing, can choose a variety of forms of valve seat, sealing performance is good, high reliability.
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