行业新闻

原文
Pneumatic diaphragm control valve flow characteristics according to selection In the automatic control system design process, select the pneumatic membrane valves should consider the flow characteristics. Typical flow characteristics of the ideal characteristics of a straight line, equal percentage flow characteristic (logarithmic flow characteristics), quick-opening flow characteristics and properties of four kinds of parabolic flow. Linear flow characteristics in the same relative change in opening the case, the flow-hour value of its large relative changes in flow, flow when the flow is relatively small change in value. Therefore, the linear flow control valve in the small opening (small load) case adjusted performance is not good, not easy to control, tend to oscillate, it is not appropriate for the small opening in the case, should not be used to adjust the system load changes in the larger applies only to the load is relatively stable, little change in the regulatory system. Percentage of the control valve flow characteristics in a small load regulation is weak, large load regulation is strong, it is close to the closed regulation is weak, work gentle smooth, and nearly full-time regulation is strong, sensitive and effective work, so for load changes in the larger occasions, both in production and semi-load full load production can better regulate the role.
原文来自：http://www.gemofa.org

是由上海埃非凯阀门有限公司提供的阀门新闻，中文译文仅供参考，以下提供站内导航搜索：

中国隔膜阀网隔膜阀产品隔膜阀知识隔膜阀厂商隔膜阀博客隔膜阀行业新闻

译文：
在自控系统的设计过程中，选择气动薄膜调节阀应着重考虑流量特性。典型的理想特性有直线流量特性、等百分比流量特性（对数流量特性）、快开流量特性和抛物线流量特性4种。直线流量特性在相对开度变化相同的情况下，流量小时其流量相对变化值大，流量大时流量相对变化值小。因此，直线流量调节阀在小开度（小负荷）情况下调节性能不好，不易控制，往往会产生振荡，故不宜用于小开度的情况，也不宜用于负荷变化较大的调节系统，只适用于负荷比较平稳、变化不大的调节系统。百分比流量特性的调节阀在小负荷时调节作用弱，大负荷时调节作用强，它在接近关闭时调节作用弱，工作和缓平稳，而接近全开时调节作用强，工作灵敏有效，因此适用于负荷变化较大的场合，无论在全负荷生产和半负荷生产中都能较好地起调节作用。

更多新闻：