Pneumatic butterfly valve
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This post was last edited by Sammy_Wang on 2016-10-12 09:24. I have a question for everyone: the medium flowing through the pipe is steam, with a pressure of 0.8 MPa. The valve used is a pneumatically actuated butterfly valve, which operates in air-shut mode. Why doesn’t the valve close to 85% of its full position? Can anyone explain this? Duplicate of the topic post; please go to the following link to reply. Medium vapor, pressure 0.8 MPa a; pneumatic control butterfly valve, air-operated valve that cannot be closed to 85% – Powered by Discuz! http://bbs.hcbbs.com/thread-1630738-1-1.html
1. The pneumatic head adjustment is not correct; loosen the screws on both sides of the pneumatic actuator and adjust it again manually. 2. There are debris in the interior of the butterfly valve; is the butterfly disc stuck?
The pneumatic head’s open and closed positions aren’t calibrated, right?
Any of the above is possible; it depends on the specific situation, and we need to rule things out one by one!
Is the switch not properly calibrated? There might be debris inside the butterfly valve chamber, and the butterfly disc could be stuck.
First, is this new or old? Did it work properly before? Check whether the current reading is accurate and whether the air pressure is sufficient Is the locator mechanical or intelligent?