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J-VALVES
Structural Features
WCB Cast Carbon Steel Body;Constructed from ASTM A216 WCB carbon steel, featuring high strength, good toughness, excellent castability and weldability, as well as outstanding cost performance. Suitable for medium-to-high pressure applications at ambient to moderate temperatures.
Extra-Large Bore Design:30-inch (DN750) extra-large bore design satisfies high-flow operating conditions. Optimized flow passage reduces turbulence and noise, enabling controllable pressure drop.
S-Type Flow Passage & Disc Structure:Built with an internal S-type flow passage for low inlet and high outlet medium flow. The disc lifts along the centerline of the seat, ensuring uniform wear on sealing surfaces, ideal for frequent opening/closing and throttling regulation.
Multiple Disc Types Available:Standard flat disc for general shut-off service、Conical/spherical disc for high-pressure sealing、Throttling/sleeve-type disc for precise flow control with a wide adjustable Cv range
Flanged or Butt-Weld End Connections:Equipped with RF (Raised Face) flanges (ASME B16.5) or BW butt-weld ends (ASME B16.25), delivering high connection strength and reliable sealing under 600LB medium-to-high pressure.
Fire-Safe Design:Compliant with API 607 standards. Flexible graphite packing and metal-sealed structures maintain sealing performance under fire conditions to prevent medium leakage.
Anti-Static Device:Conductive paths are installed between the stem, disc and body to ensure continuous static electricity dissipation, suitable for flammable and explosive media applications.
Blowout-Proof Stem Design:The stem bottom is equipped with a shoulder or retaining ring limit structure to prevent stem ejection under abnormal internal pressure, ensuring personnel and equipment safety.
Technical Parameters
Nominal Size: 30″ (DN750)
Pressure Class: 600LB (PN100)
Temperature Range: -29℃ to +425℃
Body/Bonnet: ASTM A216 WCB cast carbon steel; optional A105 forged steel (higher strength) or A350 LF2 (low-temperature service)
Disc: WCB/A105 with Stellite alloy overlay/hard chrome plating; or solid 13Cr stainless steel
Seat: WCB/A105 with Stellite alloy overlay; or solid 13Cr stainless steel
Stem: A105 + ENP, 17-4PH precipitation hardening stainless steel, or F6a (410 stainless steel)
Packing: Flexible graphite reinforced with Inconel wire; PTFE (low-temperature service)
Gasket: Flexible graphite stainless steel spiral wound gasket or metal ring gasket
Bolts: ASTM A193 B7/B7M (alloy steel) or B8M (stainless steel), with A194 2H/2HM/8M nuts
End Connection: Flanged (RF Raised Face / RTJ Ring-Type Joint, ASME B16.5); BW butt-weld ends (ASME B16.25)
Bonnet Type: Bolted bonnet (standard); pressure-seal bonnet (optional, recommended for high pressure and large bore)
Operation: Manual (worm gear box, standard for extra-large bore); electric (multi-turn motor), pneumatic (piston/diaphragm), hydraulic
Design Standard: ASME B16.34, API 602, BS 1873
Inspection Standard: API 598
Face-to-Face Dimension: Compliant with ASME B16.10
Application Areas
Oil & Gas Long-Distance Pipelines: High-flow shut-off and regulation at pump outlets, compressor inlets/outlets and metering stations. The 30-inch bore meets trunk line transmission capacity requirements.
Chemical & Coal Chemical Industry: Flow regulation, bypass control and safety relief in medium-pressure process pipelines. Globe valves offer superior precise regulation performance compared to gate valves and ball valves.
Water Treatment & Environmental Protection: Flow control and shut-off in large-scale water supply/drainage, sewage treatment and seawater desalination systems.
General Industrial Applications: High-flow regulation of water, oil, gas and other media, suitable for HVAC, water supply/drainage and general process pipelines.
Shipbuilding & Offshore Engineering: Large-bore shut-off in ballast water, bilge water and fire water systems. WCB material resists seawater and atmospheric corrosion.
Advantages & Values
Excellent Extra-Large Bore Regulation Performance: 30-inch S-type flow passage with guide ribs provides good flow regulation linearity and a wide adjustable Cv range, making it more suitable for precise throttling than butterfly valves and ball valves.
Balanced Economy & Reliability: WCB cast steel costs significantly less than forged steel and stainless steel, while meeting most industrial performance requirements at 600LB class, delivering remarkable cost optimization for extra-large bore projects.
Extended Sealing Surface Service Life: The disc lifts along the seat centerline for uniform sealing surface wear. Combined with Stellite alloy overlay, the opening/closing life is 2–3 times longer than that of gate valves.
Low Noise & Low Vibration: Optimized S-type flow passage reduces turbulence and cavitation. With sleeve-type discs, noise is reduced by 15–20dB, suitable for urban pipe networks and environmentally sensitive areas.
Comprehensive Safety & Compliance: Compliant with API 600/623, ISO 15848 and other specifications. SIL functional safety certification is optional, meeting general industrial HSE requirements.
Clear Upgrade Path: Upgradable to A105 forged steel for higher strength, A350 LF2 for low-temperature service, F316 for improved corrosion resistance, and pressure-seal bonnet for high-temperature and high-pressure conditions, protecting initial investment.
