... pressure : Within 16bar . Material Construction and Configuration : 1. Pump Casing and Cover : Cast Iron GG25 ; Ductile Cast Iron ... enlarged, no whirlpool, deduct the water pump NPSH efficiently, which makes pump work stable with little noise. 5. ... a long time Pump Construction :1. Non-self-priming, single stage, single suction, horizontal, axial suction and radical discharge, pump body is fixed ...