BS1873 Cast steel globe valve

BS1873 Cast Steel Globe Valve Product Introduction
BS1873 Cast Steel Globe Valve J41H-300LB is a cast steel globe valve, where J41H represents its type and material, with the following meanings:
J: Type code for Globe Valve.
4: Indicates the way the flange is connected.
1: It means that the structural form of the valve is straight-through.
H: indicates that the sealing surface material of the valve is Hard Alloy, but it is generally understood as a general identification here. The actual sealing surface material may vary according to specific specifications and customer requirements.
300LB: indicates that the nominal pressure rating of the valve is 300 pounds (Pound Class), which is a common pressure rating identification in American standards and is used to indicate the pressure bearing capacity of the valve.

Cast steel chemical composition:
BS1873 Cast steel globe valvebodies are usually made of cast steel material, but the specific chemical composition will vary according to different cast steel grades. Common cast steel materials include WCB (carbon steel), LCB (low temperature carbon steel) and so on. The following is an example of WCB to briefly describe its approximate chemical composition range (note that specific values may vary depending on manufacturing standards and suppliers):
Carbon (C): about 0.15%~0.30%, carbon is the main alloying element in steel, affecting the strength and hardness of steel.
Silicon (Si): about 0.15%~0.40%, silicon can improve the hardness and wear resistance of steel.
Manganese (Mn): about 0.30%~0.80%, manganese can improve the strength and toughness of steel, but also deoxidizer.
Phosphorus (P): 0.040%, phosphorus is a harmful element in steel, which will reduce the plasticity and toughness of steel.
Sulfur (S): 0.045%, sulfur is also a harmful element in steel, which can cause hot brittleness of steel.
Other elements: Alloying elements such as chromium (Cr), nickel (Ni), molybdenum (Mo) may be added according to specific needs to improve the corrosion resistance and heat resistance of steel.
It should be noted that the chemical composition of cast steel materials will directly affect the performance and service life of the valve, so when purchasing and using cast steel stop valves, attention should be paid to whether the material brand and chemical composition meet the relevant standards and requirements.

BS1873 Standard Analysis
BS1873 is a British National Standard for specification of steel globe valves and check valves (flanged and butt welded) for use in the petroleum, petrochemical and allied industries. This standard was developed by the British Standards Institution (BSI). BSI is an unofficial organization with high reputation in the world. It was founded in 1901 and is the earliest national standardization organization in the world. It is not controlled by the government but has received strong support from the government. BSI develops and revises British Standards and promotes their implementation.
The specific contents of BS1873 standard include but are not limited to the requirements for materials, design, manufacture, inspection and testing of valves. These requirements are designed to ensure safe and reliable operation of valves in the petroleum, petrochemical and related industries.
In addition, it is worth noting that as technology continues to evolve and industry standards are updated, BS1873 may also have new versions or revisions. Therefore, in practical applications, reference should be made to the new standard version to ensure compliance with current technical requirements and specifications.

BS1873 Cast Steel Globe Valve
1, cut off the medium: as a stop valve, its main function is to connect or cut off the medium in the pipeline. Shut-off valves provide reliable shut-off where complete shut-off or opening of fluid flow is required.
2, adjust the flow (although not the main purpose): although the valve is generally not used to accurately adjust the flow, but in some cases, by partially opening the valve, you can also achieve a certain degree of flow control. However, this is not the primary design purpose of the shut-off valve.
Sealing performance: The valve has good sealing performance and can effectively prevent medium leakage in the closed state. The seal cover design makes the seal between the disc and the seat more tight and reliable during opening and closing.
4. Widely applicable: Because cast steel has high strength and corrosion resistance, BS1873 cast steel stop valve J 41H-300LB is suitable for a variety of working conditions and environmental conditions, such as petroleum, chemical, metallurgical, electric power and other industries in the pipeline system.
5, a variety of driving methods: according to specific needs, the valve can be used manual, gear transmission, electric or pneumatic and other driving methods to meet the needs of different operating conditions.

BS1873 Cast Steel Globe ValveBody Parts Material

shell	ASTM A216 WCB
valve stem	F6a			F304		F316		Monel
disc surface	13Cr	13Cr	STL	304	STL	316	STL	Monel
valve seat surface	13Cr	STL	STL	304	STL	316	STL	Monel
shell	ASTM A351 CF3			ASTM A351 CF8M
valve stem	F304L			F316
disc surface	304L	304L	STL	316		316	STL
valve seat surface	304L	STL	STL	316		STL	STL