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J-VALVES
Design Features
Top-Entry Structure:The valve body adopts a one-piece or two-piece design with a bonnet on top. By removing the bonnet, all trim parts including the ball and seats can be taken out without cutting the valve from the pipeline, enabling in-line maintenance.
Trunnion-Mounted Ball Support:The ball is fixed and supported by upper and lower bearings (trunnions). Loads generated by medium pressure on the ball are borne by the bearings instead of being transferred to the stem, resulting in constant and low operating torque for easy opening and closing under high pressure.
Double Piston Effect Seat (DPE):Both upstream and downstream seats achieve independent self-energized sealing. Reliable sealing is ensured regardless of flow direction, realizing true bi-directional sealing and supporting Double Block & Bleed (DBB) function.
Carbon Steel Valve Body:The valve body is made of high-quality carbon steel such as A105, WCB, LCB, LF2, featuring high strength and low cost, suitable for non-corrosive or slightly corrosive media. Corrosionresistance is enhanced by surface coating or lining.
Flanged / Butt-Weld Connections:RF (Raised Face) and RTJ (Ring Type Joint) flanges conform to ASME B16.5; butt-weld (BW) ends are also available, with pressure ratings from Class 150LB to 2500LB.
Seat Sealing Technology:Soft seats (PTFE/RPTFE/Nylon) provide bubble-tight zero leakage. Metal seats (Stellite alloy / nickel-base alloy) resist high temperature and erosion, with service temperature up to +650℃.
Blowout-Proof Stem & Anti-Static:A shoulder at the stem bottom prevents blowout under internal pressure. Anti-static devices are installed between the body and ball, stem and body, with resistance <10Ω to avoid static accumulation.
Fire-Safe Design:Compliant with API 607/ISO 10496 standards. In case of fire, after the soft seal burns out, metal seats and the ball maintain sealing to prevent medium leakage.
Grease Injection Sealing System:Grease injection valves are provided at the seat and stem areas for emergency temporary sealing or regular lubrication to extend service life.
Flexible Operation Modes:Manual (handle / worm gear), pneumatic actuator, hydraulic actuator, electric actuator, supporting automatic control and remote operation.
DBB & DIB Functions Optional:Double Block & Bleed (DBB) or Double Isolation & Bleed (DIB-1/DIB-2) configurations to meet pipeline isolation, pressure relief and safety locking requirements.
Technical Specifications
Size Range: 2″ to 48″ (DN50 to DN1200)
Pressure Rating: Class 150LB to 2500LB (PN20 to PN420)
Temperature Range: -29℃ to +425℃
Body: A105 (forged steel), WCB (cast steel), LCB (low-temperature cast steel), LF2 (low-temperature forged steel), WC6 (1.25Cr-0.5Mo), WC9 (2.25Cr-1Mo)
Ball: A105 with ENP (electroless nickel plating), F316, F304, WCB with Stellite alloy coating
Seat: PTFE, RPTFE, Nylon, PEEK, A105 with Stellite hardfacing, F316 with Stellite hardfacing
Bearings / Trunnions: F316, 17-4PH, A105 with ENP, Stellite alloy
Stem: F6a (410 stainless steel), F316, 17-4PH, XM-19
Gaskets: Spiral wound gasket (304/316 + graphite), metallic ring gasket (soft iron, 304, 316)
Packing: PTFE V-type set, flexible graphite, low-emission graphite rings
End Connections: Flanged (RF/RTJ), Butt-Weld (BW)
Design Standards: API 6D, API 608, ASME B16.34
Test Standards: API 6D, API 598
Applications
Oil & Gas Long-Distance Pipelines:Mainline block valves, compressor station inlet/outlet valves, pig launcher/receiver valves, featuring low torque operation in large-bore high-pressure service and supporting in-line maintenance.
Petrochemical & Chemical Plants:Reactor inlet/outlet, heat exchanger bypass, high-pressure separator pipelines in ethylene cracking, FCC, hydrocracking units, resisting high temperature, high pressure and corrosive media.
Coal Chemical Industry:Syngas, black water, ash water pipelines in coal gasification plants (Shell, GSP, Texaco processes), resistant to high pressure, erosion and solid-containing media.
Oil Storage & Transportation:Tank root valves, pump inlet/outlet valves, tank switching valves in crude oil and refined product terminals, supporting Double Block & Bleed function.
Advantages & Value
In-Line Maintenance Capability:Top-entry design allows trim replacement without shutdown or pipeline cutting, reducing maintenance time from days to hours and greatly lowering downtime losses.
Constant Low Operating Torque:Trunnion-mounted design makes operating torque independent of medium pressure, enabling handwheel operation even at high pressure and reducing actuator size and energy consumption.
True Bi-Directional Sealing:DPE seat design ensures reliable bi-directional sealing, simplifying pipeline design with no installation direction restriction and supporting pipeline isolation and pressure relief.
Cost Efficiency for High-Pressure Large Sizes:Carbon steel material costs significantly less than stainless steel or alloy steel, with extended applications via coating/lining for optimal cost performance.
Safety & Compliance Assurance:Fire-safe and anti-static design, SIL certification, low-emission packing meet functional safety regulations and environmental emission requirements.
