1. The valve body has two structures of casting and welding. The short non-diversion hole flat gate valve adopts welding structure, which is short in length, light-weighted and specially fit for devices demanding light weight.

2. The floating seat structure makes it possible to seal both director of the valve.

3. The valve seat sealing adopts double-seals. PTFE can remove granule ad dirties to ensure a perfect sealing.

4. Hard sealing surface is build-up welded on sealing surface with cobalt base stellite which results in a hardness of HRC44-52 to ensure sealing reliability.

5. Valve with diversion hole, either full-open or full-closed , the disc will be kept in contact with seat so that the sealing sur­ face will not be washed out directly by mediums and the valve will become more durable.

6. The fire-resistant design of the valve complies with API 6Fa and API 607 standards. As for valves applied to hydrocarbon liquids and oil gas pipelines, to the carry these out standards will fulfill firefighting tasks.

7. When the valve is in full-opening, the passage is a straight pipeline with small fluid resistance coefficient and little pres­ sure loss. It can be cleaned by passing a wool ball.

8. The valve has got a automatic pressure relief device which can ensure operation security.