In case of fluid gases in the boiling point, the transformation of fluid into gas occurs by a minor temperature increase in the stopped pump. This gas volume then presses the fluid out of the pump towards the suction pipe. This results in the pump filling up partly or totally with gas. This can be caused by the temperature influence from outside as well as from the after-heat of the pump immediately after disconnection. Depending on the pump type it will become completely dry or filled up with gas in a way, that the impellers cannot build up delivery pressure when the pump is re-started. Thus the pump operates dry and seconds later considerable damages occur, possibly leading to destruction of the pump and environment.
The Special-Multifunction Valve (SMV) bases technically on the SSV-Series with the modulating bypass regulation.
In addition the Multifunction valve SMV provides an Automatic Degassing Device for idle or stopped pumps. Thus a continuous degasification at the pressure site of the pump is provided and the not running pump is always filled completely with delivery fluid. Immediately after start-up the pump produces the required differential pressure, and the automatic degassing device of the SMV valve shuts the degassing line tightly (see also Design and Function
Downloads:Special Multi-Function Valve SMV10 and SMV20Inquiry SheetComments on Inquiry Sheet