1. Full bore design:the full-bore valve has the diameter of channel completely equal to the inner diameter of pipe to facilitate to clean the pipe.
2. Block & Bleed function:the valve adopts spring to pre-tighten. And seat seal is double pistons. The emptying valve installed on the middle cavity is used to empty and the blow down valve installed at the bottom of valve to clear off dirt to facilitate to clean the pipe.
3. For the rising of temperature,outlet of seat has automatic relief function.
4. Fire-proof structure:when the fire happens to make PTFE soften to damage,the fire proof seal surface of seat supported circle can contact with ball to have seal function. This conforms to the rule of API607.
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