Once the valve flap of the silk buckle shut-off valve is open, there is no more contact between its valve seat and the sealing surface of the valve flap, and it has a very reliable cutting action. This valve is very suitable for cutting or adjusting and throttling the medium. 

 [Features] 

 (1) The structure is simpler than the gate valve, and the manufacture and maintenance are more convenient. 

 (2) The sealing surface is not easy to wear and scratch, and the sealing is good. There is no relative sliding between the valve flap and the sealing surface of the valve body when opening and closing, so the wear and abrasion are not serious, and the sealing performance is good and the service life is long. 

 (3) When opening and closing, the valve flap stroke is small, so the height of the shut-off valve is smaller than that of the gate valve, but the structural length is longer than that of the gate valve. 

 (4) The opening and closing moment is large, the opening and closing are more laborion, and the opening and closing time is the principal. 

 (5) The fluid resistance is large. Because the medium channel in the valve body is tortuous, the fluid resistance is large and the power consumption is large. 

 (6) Medium flow direction When the nominal pressure PN≤16MPa, the downstream flow is generally adopted, and the medium flows up from the bottom of the valve flap; when the nominal pressure PN≥20MPa, the countercurrent is generally adopted, and the medium flows downstream from the upper direction of the valve flap. To increase the seal energy. When in use, the shut-off valve medium can only flow in one direction, and the direction of flow cannot be changed. 

 (7) The valve flap is often eroded when fully opened.

Each process, each facility, and each environmental constraint has its own special requirements. Therefore, Dongyan offers a comprehensive range of products covering different performance levels, pressures, different functions and different materials.