Valve body casting shall be ductile iron complying with BS EN 1563 :2004 for diameters above DN 150, while CI valve body casting is acceptable for below DN 150 and shall be capable of withstanding the test pressures specified. The castings shall be close grained, sound, smooth and symmetrical, and shall be carefully cleaned

and dressed off. No stopping or plugging will be permitted in the case of air holes appearing in the castings.