about Putzmeister concrete pump S valve , SDBL company usually have DN180/DN200/DN230 these sizes
concrete pump pipe
ST52 seamless Concrete Pump Pipe are made from 16Mn.This kind of pipe can be used as boom pipe and deck pipe.
Type: Concrete Pump, Seamless Pipe, Condition: New, Length: 3m/6m/9m/12m, Application: Stationary Pump/Mobile Pump
Model No.: R500/R1000, Size: DN125/DN150, Bend Radius: R400/R500/R1000, Material: 20#and St52