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API Standard Forged Steel A182 F904L Floating Type Soft Sealed Ball Valve

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API Standard Forged Steel A182 F904L Floating Type Soft Sealed Ball Valve

F904L super austenitic stainless steel is a low-carbon, high nickel, molybdenum austenitic stainless acid resistant steel with excellent activation passivation transformation ability and excellent corrosion resistance. It has good corrosion resistance in non oxidizing acids such as sulfuric acid, formic acid, and phosphoric acid, and has good resistance to pitting corrosion in neutral chloride ion containing media. At the same time, it has good resistance to crevice corrosion and stress corrosion.

    The F904L forged steel ball valve is selected, suitable for various concentrations of sulfuric acid below 70 ℃, and has good corrosion resistance in any concentration, temperature, and mixed acid of formic acid under normal pressure.

    Welding performance:
    Like ordinary stainless steel, various welding methods can be used for welding. The commonly used welding methods are manual arc welding or inert gas shielded welding. The welding rod or wire metal is based on the composition of the base material and has a higher purity, with a higher molybdenum content requirement than the base material. Preheating is generally not necessary before welding, but in cold outdoor operations, to avoid condensation of water vapor, the joint area or adjacent areas can be uniformly heated. Please note that the local temperature should not exceed 100 ℃ to avoid carbon accumulation and intergranular corrosion. When welding, it is advisable to use small wire energy, continuous and fast welding speed. After welding, heat treatment is generally not required. If heat treatment is required, it must be heated to 1100-1150 ℃ and then rapidly cooled.

    Machining performance:
    The machining characteristics are similar to other austenitic stainless steels, and there is a tendency for tool sticking and work hardening during the machining process. Positive angle hard alloy cutting tools must be used, with chemical and chlorinated oil as cutting coolant. The equipment and process should be based on reducing work hardening. Slow cutting speed and feed amount should be avoided during the cutting process.


    - Size from 2” to 8” ( DN50mm to DN200mm).
    - Pressure ratings from Class 150LB to 600LB ( PN10 to PN100).
    - Split body structure 2-pc or 3-pc.
    - RF, RTJ, BW end.
    - Full bore or reduced bore design.
    - The driving mode can be manual, electric, pneumatic, or bare stem type with ISO 5211 top flange for your actuators.
    - Common materials like A105, A182 F304, A182 F316L, etc. and special high alloy materials like A182 F904L, A182 F51, A493 R60702, B564 N06600, B381 Gr. F-2, etc.


    Design Standard: API 608, API 6D, ASME B16.34
    Flange Diameter Standard: ASME B16.5, ASME B16.47, ASME B16.25
    Face-to-face Standard: API 6D, ASME B16.10
    Pressure Test Standard: API 598

    Additional Features

    Forged steel floating ball valve has small volume, light weight, simple structure, and free floating function, which can ensure good sealing; Featuring a compact structure and quick switching, the valve can be closed and the pipeline medium can be cut off by rotating it 90 degrees; The diameter of the spherical channel is the same as that of the pipeline, with low flow resistance and high flow capacity; The valve stem is bottom mounted, which prevents accidents caused by the valve stem piercing out and ensures safe use. Design characteristics of the main structure of forged steel floating ball valve:

    1. Design of extended valve stem

    The valve stem of the floating ball valve is designed with an extended valve stem structure. The design of the extended valve stem structure is mainly aimed at keeping the valve packing box structure away from the low-temperature zone, ensuring that the packing box and pressure sleeve are used at normal temperatures to prevent cold temperatures and operator frostbite. At the same time, it also prevents the sealing performance of the packing from decreasing and prolongs its service life.

    2. Design of Drip Board

    A drip plate design is adopted on the extended valve stem structure, which can prevent condensation water from vaporizing and flowing into the insulation area. At the same time, it can more effectively ensure the working environment of the packing box, thereby avoiding many adverse effects.

    3. Fire protection design

    Due to the fact that ball valves are generally used in flammable and explosive media, fire protection design is crucial. A dual seal structure of lip shaped sealing ring and spiral wound gasket is used at the connection between the valve body and valve cover, and a dual seal structure of lip shaped sealing ring and graphite packing is used at the packing box. When a fire occurs, the lip shaped sealing ring melts and fails, and the winding gasket and graphite filler play the main sealing role.

    4. Anti static design

    Through the effective action of anti-static springs and steel balls, the ball, valve stem, and valve body are in contact with each other, forming a conductive circuit. This can transfer the charges generated by the valve during opening and closing, thereby avoiding the accumulation of static electricity in the pipeline system and increasing the safety of the system. The resistance between the valve stem, ball, and valve body should be measured using a DC power supply not exceeding 12V. The measurement should be conducted on a dry valve before the pressure test, and the resistance should not exceed 10 ohms.

    Materials of Main Components

    NO. Part Names Material
    1 Bonnet A182 F904L
    2 Body A182 F904L
    3 Ball A182 F904L
    4 Gasket F904L+Graphite
    5 Bolt A193 B8M
    6 Nut A194 8M
    7 Seat Ring PTFE
    8 Stem A182 F904L
    9 Sealing Ring PTFE
    10 Packing Graphite
    11 Packing Gland A182 F316


    F904L material valves are widely used in petroleum and petrochemical equipment, such as reactors in petrochemical equipment. Acid storage and transportation equipment, such as heat exchangers. The flue gas removal device in power plants is mainly used in the tower body, flue, door panels, internal components, spray systems, etc. of the absorption tower. Scrubbers and fans in organic acid treatment systems. Seawater treatment equipment, seawater heat exchangers, papermaking industry equipment, acid and nitric acid equipment, acid making, pharmaceutical industry and other chemical equipment, pressure vessels, food equipment.