What are the reasons why the rubber pneumatic butterfly valve is ineffective?
Any pneumatic butterfly valve has its limitations. For example, spring pneumatic butterfly valves cannot be used for vibration isolation of machines with similar frequencies in many places, and air cushion pneumatic butterfly valves may not be used for vibration isolation of on-board equipment. But this does not mean that they have no shock absorption effect, only that they are not suitable for use in some places. The same is true for rubber pneumatic butterfly valves. Rubber pneumatic butterfly valve is suitable for high-frequency vibration equipment, and also suitable for some stamping type vibration. The effect is very good! Finally, many rubber pneumatic butterfly valves on the market only need the appearance, no lining! Their design premise is not designed according to the vibration reduction requirements at all. Such products cannot be called pneumatic butterfly valves at all, which is the root cause of rubber pneumatic butterfly valves.
Finally, rubber pneumatic butterfly valves are widely used;
To sum up, let's not misunderstand that rubber pneumatic butterfly valves have no damping effect. Assuming that the expected effect is not achieved, it must be that you have not selected the rubber pneumatic butterfly valve that is suitable for you.

What is the difference between pneumatic butterfly valve and flexible metal sleeve
Flexible metal sleeve refers to PULLKA wire maintenance tube. The standard tube is made of galvanized steel strip, steel strip and electrical paper. In addition, there are PVC coating, aluminum coating and stainless steel coating sleeves specially made for outdoor use, high temperature, cold and clean or corrosive gas environment.
Flexible metal casing has excellent corrosion resistance, good shock resistance, light weight (only about 14% of the weight of steel pipe), and unlimited length. It can be cut arbitrarily according to engineering requirements and embedded in the reinforcement mesh. The surface of the pipe is threaded and can be connected and bent with corresponding accessories. It is mainly used for embedding in concrete and maintenance of outdoor low-voltage electrical wiring, and can also replace the traditional pneumatic butterfly valve as the wire maintenance pipe between steel pipe and electrical equipment.
Pneumatic butterfly valve: the pneumatic butterfly valve used in electrical engineering refers to the unfilled pneumatic butterfly valve made of galvanized low-carbon steel strip (plastic coated in recent years), which can be divided into single button and double button in structure, commonly known as serpentine pipe, such as the common P3 galvanized pneumatic butterfly valve.
The pneumatic butterfly valve is generally used at the junction between the electrical equipment and the junction box of the pneumatic motor and the end port of the cable maintenance steel pipe to maintain the wire or cable from mechanical damage; It is also commonly used for connection and maintenance pipes when exposed pipes have excessive elastic (settlement) joints. Norms are listed by length of each piece according to its inner diameter.