... of products. Hydraulic model has reached domestic leading level, and flow rate compared to the old model Increased by 20% -30 ... , and excellent resistance to cavitation. QZ, QH series of pump flow with a single large, wide head range, and high efficiency ... . C: low noise, long life. QZ, QH series of impeller and impeller base material cast iron, ductile iron, bronze (bronze) and stainless ...