ADQ蝶形调节有其*的流通能力大，流阻损失小，适用于大口径调节等优势，通过科学试验的验证及应用经验，越来越多被广泛采用。

ADQ butterfly valve has it unique characters:
Large flow, small flow resistance.
It applies big diameter.
It is more widely used.

近似等百分比的调节性能：

蝶型调节阀适用在大流量、压差较低时满足调节功能，流量特性曲线介于直线特性和等百分比流量特性之间，或是抛物线形，它克服了直线流量特性在小开度时灵敏度过高，不易控制，容易产生振荡等缺点，又弥补了等百分比流量特性，小开度时相对流量小，大负荷时阀门接近全开的不足，ADQ蝶型调节阀，通过计算、测试和实践经验，在许多工况下，调节性能良好，阀体轻巧，实用性强。
Modulating performance of approximate equal percentage
In the condition of large flow and low pressure drop, butterfly valve can used as a modulating equipment, and the flow characteristic is in between of linear and equal percentage. It solves the shortage of linear characteristic which Sensitivity is too high at small opened position and is easy to surge. And it solves the shortage of equal characteristic that the relative flow is little at small opened position and the valve is full open at large flow.
 
全程动作平稳，机械公差极小，调节精度高；
提供比同规格齿轮齿条传动气缸大20%的力矩输出
压缩到70%的整体蓄能弹簧包，保证推力持续*
滚筒支撑、大滑块气缸，每年可靠动作100万次 
设计间隙小，无磨损、无震荡，调节平滑稳定无阶梯感

Scotch York:

The action is steady, the mechanism tolerance is small, and the modulation precision is high. 
Offer more 20% output torque than the same gear and rack. 
Spring pack pressed to 70% guarantees lasting thrust.
Roller support, large slippery cylinder, 1 million reliable actions annually. 
No friction, no vibration.
 
密封性能及参数 见《快速安全切断自动控程阀》样本 Sealing  parameter refer to 《fast cut off Control valve>>.