What type is the actuator for the pneumatic butterfly valve?
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Xiaobai has a question: the image indicates that the actuator required for the butterfly valve should be a pneumatic diaphragm actuator. Someone else said that generally, the actuator for globe control valves is of the diaphragm type, while butterfly valves that rotate by 90° usually use cylinder-type actuators with spring return. Is that correct?
Both are available; it’s best to follow the recommended use. For reference.
Both are available; in your specifications, eccentric rotation generally refers to pneumatic diaphragm type
The vast majority of pneumatic actuators available on the market that are used with butterfly valves are piston-type; I have seen that the Fisher 2052 series is diaphragm-type.
He doesn’t understand anything at all; it’s like talking to an ox.
I’ve encountered situations before where angle-type valves required diaphragm actuators; I found on the internet that Wu Zhong Instruments offers an angle-type pneumatic diaphragm actuator of the regulating type. Its travel angle seems to be 70 degrees or something like that – in any case, it’s not 90 degrees. Later, the customer changed the type of actuator, so it became useless; I don’t know much about it either – you can look for information online.
https://bbs.hcbbs.com/thread-3207733-1-1.html is a forum post that provides an introduction to the WA series of angular travel pneumatic diaphragm actuators
Take a look at item 10.1.11 b of SHT3005: in general, for applications with normal conditions, a spring-return type pneumatic diaphragm actuator is used; for valve systems that require a faster switching speed, a cylinder-type actuator is chosen. Additionally, this is related to region: Europe and Japan mostly use membranes as the actuator for control valves, while the United States tends to use cylinder-type actuators. In our country, the control valves were initially introduced by Wuzhong and Chuanyi, using Japanese Yamatake technology, with diaphragm actuators. As a means of regulation, I personally think there are more advantages (it is possible to adjust the opening curve of the membrane or cylinder control valve). So whether to use a film or a cylinder depends on habits, maintenance requirements, and the manufacturer. As for whether it’s good or not, it depends on the operating conditions; for adjustment, the SHT3005 is sufficient
Both Wu Zhong and Fisher offer di-eccentric and tri-eccentric diaphragm valves, in which the actuator and the valve body use links to operate. It is widely used
Butterfly valves that use diaphragm actuators are relatively few in number, yet they still represent a significant quantity.