Used for cutting role, stopcock valve with a little better than the ability to regulate, but the advantage is limited, because although the sealing surface is much larger than stopcock valve, seal effect is good, so bring too much torque, action inflexible structure of conventional positive cocks cocks its own weight due to the impact, it is difficult to achieve a great caliber.
In practice, if the use of large-size cock valve must be used inverted structure, that is, large cock head down, so that the inevitable effect of gravity, the sealing effect will be reduced, but to inject grease the way with sealed grease injection led to This valve can only be used for natural gas, oil storage and transportation, and can not be used for other industries, because the grease will pollute the media. Although the sealing effect of the ball in theory a bit weak, but can be made into large-caliber, and with the machining accuracy, sealing materials, improved valve sealing effects can already be well positioned to meet the practical application requirements, but also a broader range of applications .
Used for regulating role, and both more or less, can be rotated to make the appropriate holes on the body for the regulation.
Thus, the general require a higher sealing plug valves for the occasion, but generally a smaller diameter, while the ball valve can be applied to more and more wide range of industrial situations.
Therefore, we work according to specific occasions, to select valve Butterfly valve
