Butterfly valve

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Butterfly valve

Post by cisco on Thu Dec 13, 2012 4:04 am

Butterfly valve is closed parts (disc) disc around the valve shaft rotation to achieve open and close a valve, cut off from the main pipe and the throttling effect. Butterfly valve opening and closing member is a disc-shaped butterfly plate, in the valve body around its axis of rotation, so as to achieve the purpose of opening and closing or adjusting. Butterfly valve fully open to fully closed usually than 90 , butterfly and butterflies rod itself do not have the ability to self-locking worm gear reducer for the positioning of the disc, to stem the installation. Worm reducer, not only so that the disc has a self-locking capability, stop in any position, but also to improve the operating performance of the valve disc. Characteristics of industrial butterfly valves can withstand high temperatures, applicable pressure range is also higher, valve nominal diameter large, the body uses carbon steel, valve plate seal with a metal ring instead of the rubber ring. Large-scale high-temperature butterfly valve welded steel plate manufacturing, mainly used in high temperature medium duct smoke and gas pipelines.
Butterfly valve butterfly plate installed in the direction of the pipe diameter. Within the cylindrical passage of the valve body, disc-shaped butterfly plate around the axis of rotation, the rotation angle is between 0 ~90 , the rotation to 90 when the valve is in a fully opened state.
Butterfly simple structure, small size, light weight, and by only a few parts. And just rotate 90 to quickly open and close, easy to operate, while the fluid control valve has a good characteristic. The butterfly valve in the fully open position, the the butterfly plate thickness is the only resistance in the medium flowing through the valve, so produced through the valve, the pressure drop is small, it has a better flow control characteristics. Butterfly valve bomb seal and metal seal seal type. The elastic sealing valves, seals can be mounted on the body or attached to the periphery of the disc.
The metal seal valves generally higher than the elastic sealing valve long life, but it is difficult to completely seal. Metal seal can adapt to the higher operating temperature, and elastic sealing temperature limit of the defect.
If the butterfly valve as flow control using the main choice is the right size and type of valve. Butterfly valve structure principle is particularly suitable for the production of large diameter valves. Butterfly valves are widely used not only in the oil, gas, chemical, water treatment and general industrial, but also used in the thermal power plant cooling water system.
Common butterfly valve wafer type butterfly valve and flange type butterfly two. Stud wafer type butterfly valve connection between two pipe flanges, flange type butterfly valve with a flange valves on both ends of the flange bolts to connect the pipe flange.

cisco

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