4 Inch Dn250 Water Gate Valve Ductile Iron Flange

Stainless Steel Cast Iron Manual Flange Knife Gate Valve Connection GB

 
Cangzhou Junxi International Trade Co., Ltd.
Our company produce and export all kinds of carbon steel pipe fittings,Seamless Pipe Fittings, Our city Cang Zhou city is the hometown of carbon steel pipe fittings. We have exported to many countries, such as, Russia, Egypt Malaysia, India, Turkey, Indonesia, Jordan etc.
About the pipe fitting machine, we have different type for every machine.We have hot forming elbow machine, cold forming elbow machine, cold forming tee machine, beveling machine, shot blasting machine, etc.. Machine guarantee is one year. If our clients machine has problem, our after sale service person will come and help the clients solve the problem as quickly as possible.
 
About the pipe fitting machine, we have different type for every machine.We have hot forming elbow machine, cold forming elbow machine, cold forming tee machine, beveling machine, shot blasting machine, etc.. Machine guarantee is one year. If our clients machine has problem, our after sale service person will come and help the clients solve the problem as quickly as possible.
 
Use of valves
 
When gate valve is closed
The sealing surface can only rely on the medium pressure to seal, that is, rely on the medium pressure to press the sealing surface of the gate to the other side of the valve seat to ensure the sealing surface, this is self-sealing.Most gate valves are forced to seal, that is, when the valve is closed, it is necessary to rely on external force to force the gate to the valve seat to ensure the sealing surface of the sealing.
 
Open the door
When the gate height is equal to 1:1 of the valve diameter, the flow path is completely clear, but this position cannot be monitored during operation.In practice, the vertex of the valve stem is used as a sign, that is, the position of the open, as its full open position.In order to consider the temperature changes appear lock phenomenon, usually open to the apex position, and then back to the 12-1 turn, as the position of the full open valve.Therefore, the fully open position of the valve is determined by the position of the gate (i.e. the stroke).
 
Advantages of valves
 
1. Small flow resistance.The medium channel inside the valve body is straight through, the medium flows in a straight line, and the flow resistance is small.
2. Less effort when opening and closing.Compared with the globe valve, because whether it is open or closed, the direction of movement of the gate is perpendicular to the direction of flow of the medium.
3, high height, long opening and closing time.The opening and closing stroke of the gate is large, and the lowering is carried out through the screw.
4, water hammer phenomenon is not easy to produce.The reason is the long shutdown time.
5, the medium can flow in any direction to both sides, easy to install.Gate valve channels are symmetrical on both sides.
6, the length of the structure (the distance between the two connecting ends of the shell) is small.
7, the shape is simple, the structure length is short, the manufacturing technology is good, the application scope is wide.
8, Compact structure, good valve rigidity, smooth channel, small flow resistance, sealing surface made of stainless steel and hard alloy, long service life, PTFE packing.Reliable seal.The operation is light and flexible.

Installation and maintenance of gate valves should pay attention to the following matters:

1. Gate valve handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited.

2. The double gate plates of gate valves should be installed vertically, that is, the stem is in a vertical position, and the handwheel is at the top.

3 gate valve with bypass valve should be opened before opening the bypass valve to balance the pressure difference between the inlet and outlet and reduce the opening force.

4. For gate valves with driving mechanism, install according to the instructions of the product.5. If the gate valve is often used, lubricate it at least once a month.

Product Description