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J-VALVES
Design Features
Austenitic Stainless Steel Construction:The valve body is manufactured from stainless steels such as ASTM A182 F304/F316/F316L or ASTM A351 CF8/CF8M/CF3M, providing excellent resistance to general corrosion, pitting corrosion and stress corrosion cracking. The molybdenum-bearing F316/F316L grade offers significantly better chloride resistance than 304, making it suitable for seawater, chemical and high-chloride environments.
Socket Weld (SW) End Connections:The valve ends are machined with socket recesses for full-circumference 360° fillet welds after pipe insertion, eliminating leakage risks associated with flange gaskets. Pressure-bearing capacity is comparable to butt-weld ends, ideal for high-pressure, high-temperature applications where detachable connections are not permitted.
Flexible Wedge Design:The wedge-type flexible wedge undergoes slight deformation under medium pressure to achieve self-sealing with tight contact against the seat. Sealing performance improves with increasing pressure, suitable for steam and high-pressure gas services.
Rising Stem Structure:Stem threads are located outside the bonnet and protected from process media. The rising motion of the stem during operation provides clear visual indication of valve position.
Full Bore Flow Passage:The valve bore matches the inner diameter of the pipeline, resulting in extremely low pressure drop and flow resistance, suitable for applications requiring full unobstructed flow or pigging operations.
Fire-Safe Design:Compliant with API 607. Flexible graphite packing and metal-seated structures maintain sealing integrity under fire conditions to prevent media leakage.
Anti-Static Device:Conductive paths are established between the stem, wedge and body to ensure continuous static discharge, suitable for flammable and explosive media.
Blowout-Proof Stem Design:The stem is secured with a bottom shoulder or retaining ring to prevent ejection under abnormal internal pressure, ensuring operator and maintenance safety.
Back Seat Structure:When fully open, the stem packing is isolated from process pressure, allowing online replacement of packing under operating pressure.
Low Operating Torque:Precision-lapped seat and wedge mating surfaces, combined with high-quality lubrication, deliver low operating torque, enabling the use of compact actuators.
Compact and Lightweight:Socket weld construction results in a small footprint and light weight, ideal for dense layouts in skid-mounted units, instrument panels, ship compartments and space-restricted systems.
Technical Specifications
Size Range:1/2″ to 4″ (DN15 to DN100)
Pressure Class: 800LB ~ 2500LB (PN130 ~ PN420)
Temperature Range: -29℃ to +425℃
Body/Bonnet: ASTM A182 F304/F316/F316L (forged); ASTM A351 CF8/CF8M/CF3M (cast)
Gate: Solid F304/F316/F316L, or with Stellite overlay / hard chrome plating
Seat: F304/F316/F316L with Stellite overlay, or solid hard alloy
Stem: F316/F316L, 17-4PH precipitation hardening stainless steel or Inconel 718
Packing: Flexible graphite reinforced with Inconel wire; PTFE (for low-temperature service)
Gasket: Flexible graphite stainless steel spiral wound gasket or metal ring gasket
Bolts: ASTM A193 B8/B8M (stainless steel) or B7/B7M (alloy steel), with A194 8/8M/2H/2HM nuts
End Connection: Socket Weld (SW, ASME B16.11); optional NPT female thread, BW butt-weld ends
Operation: Manual (hand wheel / lever); optional pneumatic (piston / diaphragm) or electric (multi-turn)
actuators
Design Standard: ASME B16.34, API 600, API 602
Inspection & Test Standard: API 598
Face-to-Face Dimension: ASME B16.10
Applications
Petrochemical Plants: Reliable shut-off for high-pressure process lines in refining, ethylene and aromatic units; F316 resists sour and chemical media corrosion.
Power Industry: Critical valves for main steam, feedwater and condensate systems in thermal and gas-fired power plants; stainless steel resists high-temperature steam corrosion.
Shipbuilding & Offshore Engineering: Corrosion-resistant shut-off for ballast water, bilge water and fire-fighting water systems; F316/F316L resists chloride pitting in seawater.
General Industrial High-Pressure Systems: High-pressure shut-off for compressed air, nitrogen and hydraulic oil; socket weld connections suit space-constrained installations.
Advantages & Value
Zero-Leakage Connection Assurance: 360° full-circumference socket weld eliminates flange gasket leakage entirely. Sealing reliability under high pressure far exceeds flanged connections, suitable for critical zero-leakage service.
Superior Corrosion Resistance: Molybdenum-alloyed F316/F316L provides a Pitting Resistance Equivalent Number (PREN) ≥ 23, achieving corrosion-free performance in seawater, sour oil/gas and chemical media.
High-Pressure & High-Temperature Adaptability: Socket weld ends offer pressure capacity close to butt-weld ends, maintaining structural integrity up to Class 2500LB / 42MPa. Metal-seated designs withstand temperatures up to +650℃.
Comprehensive Safety & Compliance: Compliant with API 600/602, ISO 15848 and other standards. Optional SIL functional safety, RCC-M nuclear grade and NACE MR0175 sour service certifications meet stringent HSE requirements.
Flexible Material Upgrades: F304 for economical general corrosion service; F316/F316L for chloride resistance / hygienic applications; F321/F347 for sensitization resistance; F44/F904L for extreme corrosion environments, covering full operating conditions.
