Turbine Butterfly Valve Flange Connection Ductile Iron Material Two-Way Seal

   Worm gear flange butterfly valve, also known as worm gear flange flap valve, is a simple regulating valve that can also be used

for switch control of low-pressure pipeline media.Worm gear flange butterfly valve is suitable for pipelines that transport various

corrosive and non-corrosive fluid media in engineering systems such as generators, gas, natural gas, liquefied petroleum gas,

urban gas, hot and cold air, chemical smelting, power generation, and environmental protection.It is used to regulate and cut off

the flow of media.




Characteristics of worm gear flange butterfly valve:

1. The butterfly valve has the characteristics of simple structure, small size,light weight, low material consumption, small installation size, fast switching, 90° reciprocating rotation, and small driving torque.Itis used to cut, open and adjust the medium in the pipeline.It has good fluid control characteristics and closing and sealingperformance.

2. The butterfly valve can transport mud, and there is very little fluid accumulation at the nozzle.Under low pressure,
a good seal can be achieved.Good adjustment performance.

3. The streamlined design of the butterfly plate has small fluid resistance loss, which can be described as an energy-saving product.

4. The valve stem is a through-rod structure, which has been tempered and tempered, and has good comprehensive mechanical properties, corrosion resistance and scratch resistance.When the butterfly valve is opened and closed, the stem only rotates and does not move up or down.The packing of the valve stem is not easy to destroy and the sealing is reliable.It is fixed with the cone pin of the butterfly plate, and the outer extension end is designed to prevent the valve stem from collapsing when the connection between the valve stem and the butterfly plate is accidentally broken.

Advantages of worm gear butterfly valve

1. Easy to open and close quickly, labor-saving, low fluid resistance, and can be operated frequently.

2. The structure is simple, the dimensions are small, the structure length is short, the size is small, and the weight is light. It is suitable for large-caliber valves.

3. Mud can be transported, and the liquid accumulated at the mouth of the pipeline is minimal.

4. Under low pressure, a good seal can be achieved.

5. Good adjustment performance.

6. When fully open, the effective flow area of the valve seat channel is large and the fluid resistance is small.

7. The opening and closing torque is small. Since the butterfly plates on both sides of the shaft are basically equal to the action of the medium, the torque is generated in the opposite direction, so the opening and closing are more labor-saving.

8. The sealing surface materials are generally made of rubber and plastic, so the low-pressure sealing performance is good.



The butterfly valve is a valve with a circular butterfly plate as the opening and closing member to open, close and regulate the flow of media in the

pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is

between 0° and 90°. When it is rotated to 90°, the butterfly valve is in a fully open state.

The relationship between the opening of the butterfly valve and the flow rate basically changes linearly.If it is used to control the flow rate, its flow

characteristics are also closely related to the flow resistance of the piping. For example, the diameter and form of the valves installed in the two

pipelines are all the same, but the loss coefficients of the pipelines are different, and the flow rate of the valves will vary greatly.

If the valve is in a state with a large throttling amplitude, the back of the valve plate is prone to cavitation, which may damage the valve, and it is

generally used outside 15°.


When the butterfly valve is in the middle opening, the shape of the opening formed by the valve body and the front end of the butterfly plate is

centered on the valve shaft, and the two sides are formed in different states. The front end of the butterfly plate on one side moves in the direction of

flowing water, and the other side moves against the direction of flowing water. Therefore, one side of the valve body and the valve plate form a

nozzle-shaped opening, and the other side is similar to the throttle-shaped opening. The flow rate on the nozzle side is much faster than that on the

throttling side, and the negative pressure will be generated under the valve on the throttling side, and the rubber seal will often fall off.

The operating torque of the butterfly valve has different values due to the different opening and closing directions of the valve. Horizontal butterfly

valves, especially large-caliber valves, cannot be ignored due to the depth of water. The torque generated by the difference between the upper and

lower heads of the valve shaft cannot be ignored.In addition, when the elbow is installed on the inlet side of the valve, a partial flow is formed, and

the torque will increase.When the valve is in the middle opening, the operating mechanism needs to be self-locking due to the action of the water

flow dynamic moment.


When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the

valve body, so the pressure drop generated by the valve is very small, so it has good flow control characteristics.









Frequently asked questions


1.Where is the main market for your products?
Answer: Our company has about ten years of experience in selling valves in China, but it is still just starting out in terms of exports. We hope to conduct business with companies from all over the world in the future.

2.Can samples be provided?
Answer: We can provide samples, but the freight needs to be paid by the customer.

3.How long is the delivery time?
Answer: It currently takes about 15 days, but it does not rule out that there may be special circumstances in the middle to extend the delivery time, we will communicate with you in time; if you need special customization, the delivery time will be extended, you can consult customer service for details.

4.What are the payment methods?            
Answer: We currently support two payment methods, L/C and T/T.

5.How do you guarantee the quality of your products?
Answer: Our products are strictly tested before leaving the factory. Unqualified products will not be sold. Please rest assured.

6.How long is the warranty period?
Answer: Our warranty period is one year. If it is not man-made damage during the period, we will provide free maintenance; if it is product damage caused by improper customer operation and installation, we only provide paid warranty service.

7.Where is the shipping port usually?
Answer: Our shipping port is generally in the port of Shanghai, and we may also ship from the port of Ningbo.


Welcome to consult for more questions.