Nominal coherent way(mm):DN20-450
Pressure grade:PN10,PN16,PN25
Diaphragm type:DN20-450
Piston:DN350-750
Function and use:Regulate and control main export pressure of valve,main valve export pressure change becanse the pressure of imports and exports is changed,do not also change because the main valve exports the change of the flow,does not also change the pressure of its export because the main valve exports the change of the flow.Can be used in life supolying water,systematic pressure grade that fire-fighting system.