New structure: abandon the original middle flange setting, the valve body and the valve cover are connected by all welding, do not contact with soil, prevent the corrosion of fasteners caused by gas leakage, and effectively reduce the overall volume, reduce the weight of the valve, reduce the leakage point.

Forced seal construction

The valve adopts multiple groups of butterfly springs or springs set on the back of the two seats to provide the necessary sealing force of the valve, and does not rely on the thrust of the medium to achieve the sealing effect. Therefore, regardless of the medium pressure of the pipe network, the valve has sufficient and stable sealing force to achieve a good sealing effect.

Reliable seal

(1) When the valve is fully opened or fully closed, the sealing pair completely isolates the pipe network channel from the valve chamber, and the sealing pair of the valve seat is completely covered by the gate, preventing the damage and erosion of the sealing pair by impurities, dust, tar, and air flow in the pipe network, effectively ensuring the sealing performance of the valve and prolonging the service life of the valve.

(2) The sealing surface adopts metal or soft multi-level sealing ring structure to improve the ability of the sealing pair to resist the damage of impurities in the medium and extend the service life of the valve.

Low flow resistance design

Valve for the full diameter design, the valve plate is provided with a diversion hole, the valve is fully open, the diversion hole and the valve body at both ends of the channel to form a whole cylinder hole sealed with the valve chamber, the valve flow resistance coefficient and straight pipe the same, can meet the through pig, especially containing solid particles or dust impurities through the valve without retention phenomenon, will not fall into the valve chamber.