Pump, valve, these belong to the material?
In the stainless steel industry category: sheet only belongs to the material! In the mechanical and electrical equipment categories: valves in the screws, gaskets, nuts are materials! This is relative!
Pumps, valves are electromechanical equipment, belonging to a class of hardware fittings, but not material!
The pump belongs to the equipment (electromechanical equipment), and the valve belongs to the pipeline material.
