Butterfly valve is a kind of valve that uses the disc type hoist to rotate about 90 degrees to open, close and regulate the fluid channel. Butterfly valves are simple in structure, small in volume, light in weight, low in material consumption, small in installation size, small in driving torque, simple and rapid in operation, and can also have good flow throttling function and closing sealing characteristics. They are one of the fast developing valve varieties in recent years. Especially in the United States, Japan, Germany, France, Italy and other industrial developed countries, butterfly valves are widely used. The variety and number of butterfly valves are still expanding, and they are developing in the direction of high temperature, high pressure, large diameter, high sealing, long life, excellent regulation characteristics and one valve multi-function. Their reliability and other performance indicators have reached a high level, and have partially replaced the stop valves Gate and ball valves. With the progress of butterfly valve technology, butterfly valve will become the leading valve form.

What are the methods to identify the quality of metal soft joints
What are the methods to identify the quality of metal soft joints? We often encounter many problems when purchasing stainless steel hoses
1. The price varies from top to bottom. When the customer wants to buy stainless steel hose, he always wants to ask more companies to compare the price. But after asking, he has a headache. The prices of the three companies are too high and too low. I don't know why the gap is so big? First of all, the basic parameters and materials of the product should be unified. Whether the corrugated pipe (several layers) and net sleeve (several layers) can be made of 304 stainless steel, and what the joint of the connection mode is made of, and what the specifications are. After the specifications and materials are confirmed, the unified quotation will be better. Price is only a part of the user's choice. 2. The place of origin is endless. Many self proclaimed manufacturers have many places of origin. The user does not know which one to choose. Think about the after-sales problem and suggest the user to choose a central purchase closer to himself. 3. How to ensure after-sales service is really a key factor depending on the strength of the manufacturer. Good companies have special after-sales personnel, which can only be judged by the user himself. 4 Is it necessary to carry out practical investigation? It is necessary to stop the field investigation when ordering in large quantities, so as to facilitate long-term cooperation in the future.