... home and abroad. Company specializes in concrete pump pipe and fittings (HBT30 40 60 80 100),high-and-low-pressure pipes have ... , hard alloy wears plate Cutting ring, S pipe swing valve,concrete pump piston hydraulic transmission cylinder seals repair package and rubber ... . Our company's newly-operation production line of medium-frequency concrete pump reducer pipe can produce 20 #, 35 #, J55 wear- ...