... , Production Overview: Type ZG(or ZGH)gravel pumps are the series products introduced from ZIDONG Gravel pumps are designed for continously ... of single casing connected by means of clamp bands and wide wet-passage.The wet-parts are made of Ni-hard ... . 2, Main Features: Single casing structure; High efficiency, wear resistant, wide flow channel, good ability of NPSH, stable performance, easy assembly ...