A pneumatic valve is running, if the spool and stem off, what will happen?
G, with valve positioner, you need to check whether the locator output can reach maximum value.
C, the valve head leaks;The D and the zero spring are too large;E, the stem is too short;F, the pressure difference between the valve is too large;
For the following reasons:A, spool, seat sealing surface wear seriously;B, valve, valve seat, see a foreign body stuck;
