tender for procurement of various sizes of valves for burner 6 items; a forged alloy steel globe valve for burner atomising steam isolation valve - size: 25mm ( 1 ^ prime prime ) 2 forged alloy steel globe valve for burner hfo isolation valve - size: 25mm ( 1 ^ prime prime ) 3 forged carbon steel non return valve for burner atomising steam - size: 25mm ( 1 ^ prime prime ) 4 forged alloy steel globe valve for burner atomising air isolation valve - size: 20mm ( 3 /4^ prime prime ) 5 forged alloy steel globe valve for burner diesel isolation valve - size: 20mm ( 3 /4^ prime prime ) 6 forged carbon steel non return valve for burner atomising air - size: 20mm ( 3 /4^ prime prime )