Butterfly valve product description:
1, small size, light weight, with excellent cutting performance.
2. The butterfly plate sealing surface is designed to be an oblique truncated conical surface relative to the axial center of the butterfly plate, so that the butterfly plate sealing surface and the valve seat sealing surface have a certain contact angle. The contact angle is evenly distributed around its circumferential surface equal to an elongated one. Wedge-shaped, and the sealing line at the longitudinal direction of the butterfly plate is a quasi-elliptical curve, both of which simultaneously serve as sealing compensation.
3, butterfly plate sealing surface in the closed state, the uniform force, high pressure capacity; butterfly plate in the opening process, the sealing surface at the same time complete the valve seat sealing surface movement, no squeeze phenomenon, basically no friction, The moment of opening is very small. Therefore, the cost is low, the sealing performance is good, and the service life is long.
4, a variety of sealing structure for choice to ensure the service life and reliability. The butterfly valve seals have integral soft seals (PTFE, C-TFE, G-TFE), hardened sheet metal, and integral + carbide, which are suitable for a variety of applications.
5, can achieve two-way sealing function, both adjustable and cut off.
6. The actuator has low friction, high work efficiency, large thrust, and good safety.
7. The design of the dexterous type and combination type (manual mechanism) of the actuator can ensure the random installation and flexible control in all directions.
8, simple and eye-catching, reliable integration of the trip instructions and limit switch and solenoid valve combination of installation, no external piping, reduce leakage.
9, a variety of executive agencies to choose from, to meet different user requirements.
10, convenient assembly and maintenance, with superior performance and price ratio.
Butterfly valve, also known as flap valve, is a simple structure of the regulating valve, but also can be used for low-pressure pipe medium switching control. A butterfly valve means that the closing member (valve or butterfly plate) is a disk, which rotates around the valve shaft to open and close a valve. The valve mainly serves to cut off and throttling. Butterfly valve opening and closing device is a disc-shaped butterfly plate, rotating around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjusting.
The disadvantage of the rubber seal butterfly valve is that if it is used for throttling, cavitation may occur due to improper use, and the rubber seat may peel off or be damaged. For this reason, the metal seal butterfly valve is now being developed internationally, and the cavitation area has been reduced. In recent years, China has also developed a metal seal butterfly valve. In recent years, Japan has also developed a comb-shaped butterfly valve that is resistant to cavitation erosion, low vibration, and low noise.
The following points should be noted when installing the butterfly valve:
1. The butterfly plate of the butterfly valve is installed in the diameter direction of the pipe.
2. When the butterfly board is installed, the butterfly board should be stopped at the closed position.
3, the opening position should be determined by the rotation angle of the butterfly plate.
4. A butterfly valve with a bypass valve should open the bypass valve before opening.
5, should be installed according to the installation instructions of the butterfly valve manufacturer, the heavy weight of the butterfly valve, should set a solid foundation.
To make the butterfly valve have a long service life, it is necessary for routine maintenance. The following points should be noted:
1: The relationship between the opening and the flow rate of the butterfly valve basically changes linearly. If used to control the flow, its flow characteristics are also closely related to the flow resistance of the piping. If the diameter and form of the two pipeline installation valves are the same, and the pipeline loss coefficient is different, the flow rate difference of the valves will also be very large. ?
2: If the valve is in a large throttling state, the back of the valve plate is prone to cavitation and may damage the valve. Generally, it is used outside 15°. ?
3: When the butterfly valve is in the middle opening degree, the shape of the opening formed by the front end of the valve body and the butterfly plate is centered on the valve axis, and the two sides form different states. The front side of the butterfly plate moves in the direction of the flowing water, and the other side flows in the opposite direction. Directional movement, therefore, one side of the valve body and the valve plate form a nozzle-like opening, the other side similar to the orifice-shaped opening, the nozzle side faster than the throttle side of the flow rate, and the throttle valve under the side will produce negative pressure Rubber seals often come off.
4: The operating torque of the butterfly valve varies depending on the opening and the direction of opening and closing of the valve. The horizontal butterfly valve, especially the large-diameter valve, due to the depth of water, the torque generated by the difference between the upper and lower heads of the valve shaft can not be ignored. In addition, when the elbow on the inlet side of the valve is deflected, the bias flow will increase. When the valve is in the middle opening, the operating mechanism needs to be self-locking due to the effect of the water flow torque.
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