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J-VALVES
Design Features
High-Strength Forged Steel Material:The valve body is made of forged steel materials including ASTM A105, A350 LF2, A694 F52/F65/F70, featuring compact structure and uniform properties. Optimized forging flow lines and heat treatment deliver excellent mechanical performance, with pressure-bearing capacity significantly superior to cast steel, meeting the stringent material requirements of API 6D for pipeline valves.
Trunnion Mounted Design:The ball is fixed to the valve body via upper and lower trunnions. The substantial thrust generated by medium pressure is borne by the bearing system, providing stable and extremely low operating torque. This eliminates operating difficulties or seizure of floating ball valves under large-bore and ultra-high pressure conditions, making it especially suitable for 8-inch 1500LB extreme high-pressure applications.
Full Bore Design (8"):The flow passage diameter matches the pipeline inner diameter (DN200), resulting in minimal pressure drop to meet large-flow transmission requirements. It allows pig passage in long-distance pipelines and reduces pumping energy consumption.
Double Seat Sealing System:Standard double piston effect (DPE) seats ensure reliable bi-directional sealing. Single piston effect (SPE) self-relieving seats are optional to prevent abnormal pressure buildup in the body cavity, complying with different safety codes. Preloaded seat springs guarantee initial sealing under low-pressure conditions.
Flanged Connection:RTJ (Ring Type Joint) flanged connection conforms to ASME B16.5, Class 1500 (PN260). Octagonal or oval metal ring gaskets ensure absolute sealing reliability under ultra-high pressure.
API 6D Standard Design:Fully complies with API 6D Pipeline Valves specification, including face-to-face dimensions, end connections, pressure testing, function verification, documentation and marking. API 6D monogram certification is available to meet procurement requirements of global pipeline projects.
Fire-Safe Design:Complies with API 607/ISO 10496. In case of fire, metal-to-metal sealing and graphite packing retain sealing performance, preventing secondary disasters caused by flammable medium leakage.
Anti-Static Device:Built-in anti-static spring/steel ball structure ensures electrical continuity between the stem and body, and between the ball and body, preventing static accumulation from high-pressure, high-velocity flowing media.
Blowout-Proof Stem Design:The stem is equipped with a lower anti-blowout shoulder. Even in the event of abnormal pressure surge inside the valve, the stem is prevented from being blown out by medium pressure, ensuring operational safety under extreme pressure.
Body Cavity Pressure Relief & Safety:An automatic pressure relief valve or relief hole is installed in the valve body cavity to prevent overpressure caused by thermal expansion of the medium, ensuring safe valve operation.
High-Pressure Bearing System:Upper and lower trunnions use hardened stainless steel with self-lubricating bearings (e.g. PTFE/graphite/metal composites) to withstand heavy medium thrust, ensuring flexible operation and minimal wear under ultra-high pressure.
Technical Parameters
Nominal Diameter: 8 inch (DN200)
Pressure Class: 1500LB (PN260)
Temperature Range: -29℃ to +425℃
Body/Bonnet: Forged steel including ASTM A105, A350 LF2, A694 F52/F65/F70
Ball: Material matched with valve body + hard chrome plating or nitriding treatment
Stem: Stainless steel such as 17-4PH, 316, F51
Seats: RPTFE, PEEK, nylon (secondary sealing for medium and low pressure); primary sealing with metal seats (Stellite alloy hardfacing)
Sealing Materials: Graphite packing (stem sealing), metal-to-metal seat sealing (primary sealing)
Bearings/Trunnions: 440C stainless steel with self-lubricating bearings, or Inconel alloy
Bolting: High-strength alloy steel ASTM A193 B7 / A194 2H
Connection Type: Flanged (RTJ, ASME B16.5)
Operation: Manual (worm/bevel gear with torque-reducing bearings), pneumatic, electric, hydraulic, electro-hydraulic (high-torque actuators required)
Design Standards: API 6D, ASME B16.34, API 608
Testing Standards: API 6D, API 598
Face-to-Face: ASME B16.10
Application Areas
Oil & Gas Long-Distance Pipelines:Used in trunk and branch lines for cross-border/cross-regional long-distance transmission of crude oil, refined oil and natural gas, for line isolation, pig launching/receiving and station block isolation, withstanding ultra-high pressure and hydrodynamic pressure.
High-Pressure Gas Field Production:Applied in wellheads and gathering systems of high-pressure gas wells, shale gas fields and tight oil/gas reservoirs, enduring extreme wellhead pressure.
Natural Gas Storage & Peak Shaving:Suitable for ultra-high-pressure piping systems of underground gas storage, LNG terminals, and urban peak-shaving storage and distribution stations.
Compressor Stations & Processing Plants:Used as core ultra-high-pressure shut-off and bypass isolation valves in natural gas compressor stations and processing plants (dehydration, desulfurization, dehydrocarbon).
Chemical High-Pressure Systems:Applied in ultra-high-pressure process pipelines for hydrocracking, high-pressure polymerization, synthetic ammonia and other units.
Coal Chemical & Fertilizer Industry:Suitable for ultra-high-pressure sulfur-containing and chlorine-containing medium control in coal gasification, coal-to-liquid, and syngas purification systems.
General Industrial High-Pressure Applications:Used for on-off control and isolation of large-flow ultra-high-pressure media such as water, oil products and gases.
Advantages & Value
API 6D Internationally Certified Quality:Fully compliant with API 6D pipeline valve standard, with optional monogram certification. The whole process of design, manufacturing, testing and documentation is controlled, meeting procurement requirements of global oil and gas long-distance pipeline projects with high international recognition.
Excellent Ultra-High Pressure & Large-Bore Performance:The trunnion mounted design transfers massive medium thrust under 8-inch 1500LB to the bearing system, delivering controllable and stable operating torque and avoiding the risk of inoperability or sealing failure of floating ball valves under ultra-high pressure.
Multiple Safety Guarantees:Layered protection including fire-safe, anti-static, blowout-proof stem, body cavity relief, emergency grease injection, DBB/DIB functions, complying with the strictest safety codes for oil and gas pipelines and reducing catastrophic accident risks.
Full Bore & Low Pressure Loss:No reduced bore causes no extra pressure drop, lowering large-flow pumping energy consumption, enabling pig passage and improving transmission efficiency.
Adaptable to Automation & Intelligence:Low-torque characteristics allow easy integration with pneumatic, electric, hydraulic and electro-hydraulic actuators, realizing remote control, emergency shutdown (ESD) and SCADA system integration.
Global Standard Compatibility:Complies with international standards such as API, ASME and ISO, with globally universal end dimensions, facilitating procurement, installation and spare parts replacement for cross-border projects.
