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J-VALVES
Structural Features
WCB Carbon Steel Material: The valve body is cast from ASTM A216 WCB carbon steel, featuring excellent mechanical properties, high yield strength, strong pressure-bearing capacity and cost-effectiveness. It is suitable for high-temperature and high-pressure working conditions with neutral media such as steam and water.
Self-Sealing Bonnet Structure: The bonnet and body adopt a pressure self-energized sealing structure (e.g., wedge gasket or octagonal gasket sealing). The higher the medium pressure, the more reliable the sealing. Compared with bolted flanged bonnets, it significantly reduces the risk of external leakage under high pressure, making it ideal for ultra-high pressure applications.
Butt Weld Connection (BW): The valve ends are connected to the pipeline by full butt weld in accordance with ASME B16.25. With no flanged sealing faces or bolted joints, it completely eliminates leakage risks at connections. It features a compact structure and high pressure resistance, suitable for critical high-pressure systems.
Rising Disc Design: The disc moves linearly along the valve stem axis with an S-shaped or angular flow passage, delivering excellent throttling and regulation performance. When closed, the disc sealing face fits tightly with the seat to achieve reliable shut-off.
Hardfaced Disc and Seat: Sealing surfaces are hardfaced with Stellite or other hard alloys, providing high temperature resistance, erosion resistance and wear resistance, thus extending the service life of sealing components.
Non-Rotating Stem Design: The disc is flexibly connected to the stem. The disc does not rotate with the stem during operation, reducing wear on sealing faces and improving sealing reliability.
Top-Entry Bonnet Structure: The self-sealing connection between bonnet and body allows online maintenance of internal parts without removing the valve from the pipeline.
Fire-Safe Design: Compliant with API 6FA standard. Graphite packing and metal sealing structures maintain sealing integrity in case of fire to prevent catastrophic leakage.
Stem Blowout-Proof Design: The stem is equipped with a blowout-proof structure to ensure operational safety under ultra-high pressure conditions.
Optional Extended Stem and Bellows Seal: Suitable for high-temperature, toxic or radioactive media to achieve zero leakage at the stuffing box.
Technical Parameters
Nominal Diameter: 12" (DN300)
Pressure Class: 2500LB (PN420)
Temperature Range: -29℃ to +425℃
Body: ASTM A216 WCB Carbon Steel
Bonnet: ASTM A216 WCB Carbon Steel
Disc: WCB with Stellite hardfacing
Seat: WCB with Stellite hardfacing
Stem: ASTM A182 F6a (410 Stainless Steel) / 17-4PH / F316 (optional)
Gasket: Soft iron, mild steel, stainless steel, Inconel (selected based on temperature and pressure)
Packing: Flexible graphite, braided graphite reinforced with Inconel wire
Weld Ends: ASME B16.25 compliant
End Connection: Butt Weld (BW), conforming to ASME B16.25 / ASME B16.34
Operation: Manual (heavy-duty worm gear, standard), pneumatic, electric, hydraulic
Design Standard: ASME B16.34, API 602, BS 1873
Inspection Standard: API 598
Face-to-Face Dimension: ASME B16.10 compliant
Applications
Power Industry: Used in main steam systems, high-pressure feedwater systems and reheat steam systems of supercritical and ultra-supercritical thermal power units to handle high-temperature and high-pressure steam for reliable shut-off and flow regulation.
Petrochemical Industry: Applied to material transportation and control in high-pressure units such as hydrocracking, hydrotreating and catalytic cracking.
Coal Chemical Industry: Used in high-pressure black water, ash water and syngas systems of coal gasification, coal-to-liquid, coal-to-olefins and other plants, resisting high pressure and solid particle erosion.
Oil & Gas Industry: Provides reliable shut-off for ultra-high pressure systems including high-pressure gas wells, compressor stations and gas injection stations.
General Industry: Suitable for reliable shut-off and flow control of high-pressure water, steam, oil and other neutral media.
Advantages & Values
Ultra-High Pressure Zero External Leakage: Self-sealing bonnet combined with butt weld connection delivers enhanced sealing with increasing pressure, completely eliminating external leakage risks under ultra-high pressure.
Large-Bore Regulation Performance: 12" size with rising disc design offers superior throttling characteristics for high-pressure large-bore applications requiring flow control.
Durable Sealing Surfaces: Stellite hardfaced seats and discs resist high temperature and erosion, greatly extending service life in high-pressure steam service.
Lifecycle Economy: Self-sealing structure reduces bolt tightening maintenance; butt weld connection is maintenance-free, significantly lowering total cost of ownership (TCO).
Full Safety Compliance: Designed in accordance with API 623, equipped with fire-safe and blowout-proof features to meet stringent international safety standards for high-pressure hazardous services.
Easy Maintenance: Top-entry bonnet enables online servicing of internals without pipeline removal, minimizing system downtime.
