How to determine the opening degree of a ball valve
Thread Content
This post was last edited by wwxxss_1 on 2010-8-2 at 16:24. I’m new to the instrumentation field and have a small question for everyone: since a ball valve can block the travel switch when it is closed, how can we determine its fully open state? Is it necessary to determine it solely by checking the position of the valve stem? What I mean is, if there’s a problem with the ball valve, how can I tell if it’s fully open?
Install a limit switch, which also has a valve position transmission function. That way, all your problems will be solved! It is recommended to use limit switches from PMV or WESTLOCK.
The valve position feedback output display seems to show the opening degree
If fully closed can counteract the limit switch, then fully open will work as well; install another one so that it can also act as a counterbalance when in the fully open position.
A signal can also be installed when it is opened to the full position.
The ball valve is equipped with a travel switch that indicates the valve’s position. Additionally, if the travel switch cannot determine the valve’s position, it can be determined by examining the condition of the shaft connected to the valve body. Generally, the top end of the shaft is square, with a groove in the shape of a “1” between two of its diagonals; when the shaft is horizontal relative to the valve seat, the valve is in the open position, while when it is at 90°, the valve is in the closed position. If there is a handwheel, it is possible to determine the safe operating state of the valve; this safe state refers to whether the valve should be in an open or closed position. The information can be found in the valve’s specification sheet or by consulting the manufacturer. During operation, it is also possible to determine the appropriate state based on the process requirements