PCTH测试阀可实现持开的功能，环空泄压后仍能保持开启状态，使用起来更加方便、灵活。

PCTH tested valve has the function of being open state constantly and that keeping on open after annulus pressure relived out makes it much handy and be liable to be used.

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特制急速放泄阀门，开模下降。

Special rapid release vent valve, mold down.

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特制急速放泄阀门，开模下降。

Special rapid release vent valve, mold down.

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