What's the difference between a ball valve and a butterfly valve? Which one has better sealing performance?
(1) the butterfly valve from the valve body, valve seat, valve plate, valve rod, all parts are a significant drain on the outside, one eye can see; the ball valve is composed of a valve body, the valve core (a round ball), valve rod, valve position is in the valve body inside, the naked eye can see only a part, so the seal the performance of the valve than the butterfly valve well;
Force code valve industry for you to resolve their differences:Ball valve in the pipeline is mainly used to do cutting, distribution and change the direction of media flow, it only need to rotate 90 degrees of operation and a small rotating torque can be closed tight.Butterfly plate driven by the stem, if you turn 90 degrees, you can complete a headstock. Change the deflection angle of the butterfly plate to control the flow of the medium.Sealing performance of the ball valve is better than butterfly valve.
The structure of valve and butterfly valve, and determines the price of the different use of the environment. The same nominal diameter of the butterfly valve and ball valve has the advantages of simple structure, low cost, adjustable range, liquid and gas valve is usually applied to non particulate impurities like fluid, small pressure loss, good sealing performance, high cost. Generally speaking: small caliber election ball valve, large caliber butterfly valve.
(3) butterfly valves are divided into soft seal and seal, soft seal butterfly valve is generally perpendicular to the center of the plate, is the valve plate, valve seat, valve stem is the center position of the highest temperature soft sealing butterfly valve is 150 degrees below the pressure of 16 kg, hard seal butterfly valve can be divided into single eccentric, double eccentric three, the eccentric, we generally use more than three eccentric, because the three eccentric according to its structure, better sealing performance, hard seal butterfly valve pressure is 64 kg;(4) the valve can also be divided into soft seal and seal, soft seal valve can reach the highest temperature below 280 degrees, the pressure is below 64 kilograms, hard seal ball valve temperature can reach 425 degrees below the pressure below 100 kilograms.
