Why double seat valve small opening work easy to oscillate?

2017-01-05

For single-core, when the medium is open-type, the valve stability is good; when the medium is closed, the valve stability is poor. Double seat valve has two spool, the lower spool in the flow closed, the spool in the flow open, so that in the small opening work, the flow closure of the valve core is easy to cause the valve vibration, which is double seat valve Can not be used for small opening work of the reasons.