Ⅰ.Overview of Expansion Flat Gate Valve

The expansion type double gate flat gate valve is a pipeline valve designed according to the American standard API6D. The valve adopts a K-shaped double gate design, and the valve seat and gate are made of supersonic sprayed tungsten carbide material, which makes the valve more wear-resistant and has a longer service life. Unique K-shaped double gate design, with more reliable expansion sealing; And it has fire-resistant design, DBB dual blocking and dual emission function, pressure test inlet sealing, dual safety of inlet/outlet sealing, small switch torque, and long service life.

Ⅱ.Structural characteristics of expansion type double gate flat gate valve

1. The valve seat adopts an O-ring seal and a floating valve seat structure with pre tightening force, which enables bi-directional sealing of the inlet and outlet of the flat gate valve. The opening and closing torque of this structure is only half of that of ordinary valves, making it easy to open and close the valve.

2. When fully open, the channel is smooth as a straight line, with a very small flow resistance coefficient and no pressure loss. It can be cleaned by passing a cleaning ball through the pipeline.

3. Adopting a packing structure with self sealing ability, it does not require frequent adjustment, and the opening and closing are extremely lightweight with reliable sealing performance. The packing box is equipped with an auxiliary sealing high-quality injection structure, and the sealing performance is absolutely reliable. In addition to PTFE packing, a triple sealing structure with 0-ring sealing sleeve is also added, truly achieving zero leakage and solving the most common problem of leakage at the packing of general valves.

4. When closed, it can automatically remove the high pressure inside the chamber to ensure safe use.

5. Equipped with DBB dual blocking and dual emission function, it can test the pressure and seal the inlet and outlet with dual safety.

6. The gate adopts a K-shaped double gate design, and the valve seat and gate are made of supersonic sprayed tungsten carbide material, making the valve more wear-resistant and extending its service life

Working principle

The transmission device drives the valve stem, which in turn drives the main gate to move up and down. The auxiliary gate moves together with the main gate under the drive of the connecting rod, thereby realizing the opening and closing movement of the combined gate, and supporting the gate plate at the valve opening and closing positions to achieve the flow and cutoff of the upper and lower media. At the beginning and end of the movement process, the combination gate produces a tight and expanding effect on the sealing surfaces on both sides of the gate due to the cooperation of the main and auxiliary gate plates, in order to achieve forced sealing and protect the sealing surfaces during opening.

Ⅲ.Regarding standard specifications

1. Design standard according to API 6D standard

2. Flange standard according to ASME B16.5 standard

3. The structural length shall be in accordance with ASME B16.10 standard

4. The pressure test standard shall be in accordance with API 598/API 6D standards

Ⅳ.Main components and external dimensions of expansion type double gate flat gate valve

600LB Dimensions

Ⅴ.Precautions for using expansion type double gate flat gate valve:

1. Say the important thing three times: don't push yourself to the brink of death! Don't push yourself to the brink of death! Don't push yourself to the brink of death!

2. When opening or closing in place, the valve stem handle or handwheel should be rotated 1/2 turn. To ensure that the gate is in a floating state and maintain good sealing performance.

Note: Detailed parameters, data, and prices of the expansion type double gate flat gate valve are available for pre understanding

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