The valve body, valve cover and other core components of the forged steel stop valve are forged from a whole piece of steel. Compared with the casting process, forging can eliminate the internal pores of the metal, increase the material density by 20%-30%, and the compressive strength can reach 1.5 times that of ordinary steel. The valve adopts a conical valve disc design inside. When closed, the valve disc and the valve seat form a “hard-to-hard” seal (metal surface direct contact seal). With the self-sealing structure, the greater the pressure, the tighter the seal.
The “strength” of forged steel stop valves and ordinary cast steel stop valves is different, mainly reflected in the following:
In terms of pressure resistance:
Forged steel stop valves can reach more than 25MPa; ordinary cast steel stop valves are usually ≤10MPa.
In terms of temperature resistance range:
Forged steel stop valves -196℃~+550℃; ordinary cast steel stop valves -29℃~+425℃.
In terms of sealing life:
Forged steel stop valves are opened and closed 5000 times without leakage; ordinary cast steel stop valves need to be replaced after about 2000 times.
Maintenance cost:
Forged steel stop valves need to have their seals replaced every 5 years; ordinary cast steel stop valves need to be overhauled every 2 years.