The concrete pump S-tube valve is a crucial component in the pumping system. It is used in combination with the wear plate and wear ring. The valve is pivotable mounted inside a concrete hopper. It alternately connects one of two outley ends of the pumping cylinders to the inlet end of the discharge conduit which was mounted on the from wall of the hopper. Name concrete pump s pipe/ s tube/ s valve Material Welded pipe 16Mn, Shaft 38CrMoAl, 45# steel, Hardfaced inside pipe Size DN180, DN200, DN230 Electrode HRC