When the pilot valve opens, pressure on the spring side of the main valve ( increases) (decreases), and system pressure opens the main valve. ... mai valve djustable spring a reser ain valve spring voIIa#39; m The graphic symbol for a pilot operated relief valve is shown above. ... Flow from both the main and the pilot valve is returned to . from main circuit A adjustable spring 6a#39; to branch circuit 7? valve open, anbsp;...
|Author||:||Penton Education Division, Penton Publishing Company, Inc|