In the 1930s, the United States invented the butterfly valve, which was introduced to Japan in the 1950s and was not commonly used in Japan until the 1960s. However, promotion in our country was after the 1970s. At present, butterfly valves of DN300 mm or above have gradually replaced gate valves in the world. Compared with the gate valve butterfly valve has a short opening and closing time for the moment of small, small installation space and light weight. Take DN1000 as an example, the butterfly valve is about 2T, while the gate valve is about 3.5T, and the butterfly valve is easy to combine with various driving devices, and has good durability and reliability. ? The disadvantage of rubber seal butterfly valve is used for throttling, due to improper use will produce cavitation, rubber peel, damage and so on. To this end, the international development of metal seal butterfly valve, cavitation area decreases in recent years, China has also developed a metal seal butterfly valve in Japan in recent years also developed cavitation-resistant, low vibration, low noise comb-shaped butterfly valve. General seal seat life under normal circumstances, rubber 15 years - 20 years, metal 80 years - 90 years. But how to choose correctly according to working conditions. The relationship between the opening of the butterfly valve and the flow rate changes substantially linearly. If it is used to control the flow, its flow characteristics are closely related to the flow resistance of the pipe. For example, the diameters and forms of the valves installed in the two pipes are all the same, while the pipe loss coefficient is different, and the flow difference of the valve will also be very large. ? If the valve is in a state of large throttling, the back of the valve plate is prone to cavitation, the possibility of damage to the valve, are generally used outside the 15 °. When the butterfly valve is at the 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 form a different state. The front end of the butterfly plate on one side moves in the direction of flowing water while the direction of the counter flow Therefore, one side of the valve body and the valve plate is formed like a nozzle-shaped opening, the other side is similar to the orifice-shaped opening, the nozzle side is faster than the throttling side of the flow rate, and the throttling side valve generates a negative pressure below, Rubber seals tend to come off. Butterfly valve operating torque, due to the opening and the valve opening and closing direction of different values, horizontal butterfly valve, especially large-diameter valve, due to the depth of the valve shaft, the difference between the head and the resulting torque can not be ignored. In addition, the valve inlet side of the device elbow, the formation of bias current, the torque will increase. Valve in the middle of the opening, due to the role of water flow torque, the operating mechanism needs self-locking.
The Hydraulic Valve direction control valve is used to open the oil circuit or change the direction of oil flow in the Hydraulic System to control the aerodynamics of the hydraulic actuator or stop and change the movement direction of the actuator. Based on the original directional valve petroleum research products, the company has successfully developed a variety of new products, such as directional valves with emergency handles and directional valves with position monitoring functions, to meet the needs of different customers under different working conditions.
Technical characteristics
Simple structure, light volume, easy installation and disassembly
The connection port of the wiring pipe should meet the overall design requirements
Low pressure loss and high reliability
No impact directional valve, small directional impact, low noise
Reversing valve with emergency handle can be used during power failure
Directional valve with position monitoring can monitor the position of the spool in real time
Application field
Petroleum research series directional valves are mainly used in construction machinery, sanitation machinery, coal mines and injection molding machines, etc.
Hydraulic Valve
Hydraulic Valve,Hydraulic Solenoid Valve,Hydraulic Check Valve,Hydraulic Relief Valve
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