Dual Expanding Plug Valve

Valve open:
When the valve is opened, first rotate the handwheel to lift the cock and pull the sealing slide back from the sealing surfaces on both sides of the valve body. When the sliding plate is completely retracted and separated from the sealing surface of the valve body, continue to turn the handwheel to rotate the cock and the sealing sliding plate by 90 degree, and the valve is in the open position.

About sealing:
The elastic sealing ring is molded into the groove of the sliding plate. As the sealing sliding plate moves to the inlet and outlet of the valve, the sealing circle is gradually pressed into the groove. The surface of the mechanically processed sliding plate and the inner cavity of the valve form two parts. The grade gold-to-metal seal prevents the elastic sealing circle from being continuously pressed, and has a fire-proof function.
Double-off, double-off and venting:

This is a method to completely isolate the pipelines at both ends through two shut-off valves and a relief valve in the middle. Closing the two main valves and opening the relief valve can improve the safety of the system. If the first valve leaks, the leaked medium can be led out by the opened relief valve.
Double sealing method:

Two independent sealing slides are pressed tightly at the upper and lower ends of the valve hole (double shut-off). When the valve is closed, the relief valve is opened to check the sealing effect (discharge).