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J-VALVES
Structural Features
Quick-loading Modular Design: The valve body adopts a split-body or top-entry structure. Internal components (ball, seats, stem, seals) are pre-assembled into an integral cartridge module, which can be quickly extracted or installed from the top or side of the valve body without disconnecting pipelines at both ends, reducing maintenance time by more than 70%.
Trunnion-mounted Structure: The ball is fixed by upper and lower trunnions and does not float under medium pressure. Sealing is achieved via spring-loaded seats or piston effect, featuring low operating torque and suitability for high-pressure and large-bore applications.
Top-entry or Split-body Structure:
Top-entry: The bonnet is located at the top, and internal components can be lifted out vertically without pipeline movement, making it ideal for in-line maintenance.
Split-body: The valve body is split along the flow path centerline with bolted connections, allowing horizontal extraction of internal components, suitable for large-bore and high-pressure services.
Pre-assembled Seat-ball Module: Seats, springs, sealing rings and ball are pre-assembled as an integral unit, factory-calibrated and directly installed on-site, eliminating on-site assembly errors and ensuring consistent sealing performance.
Double-seat Bi-directional Sealing: Upstream and downstream seats are independently spring-loaded for bi-directional sealing. Single Piston Effect (SPE) or Double Piston Effect (DPE) designs are available to meet different pressure relief requirements.
Full Bore Flow Path: Near-zero flow resistance and extremely low pressure drop in full open position, allowing pig passage, ideal for long-distance pipelines.
Metal or Soft Sealing Options: Soft seals including RPTFE, Devlon and PEEK provide zero leakage; metal seals such as SS316+Stellite, tungsten carbide and Inconel resist high temperature, high pressure and solid particles.
Quick Connect End Options: In addition to standard flanges, high-pressure self-energized quick connections such as Hub-Clamp, Grayloc and Techlok are available for rapid assembly and disassembly of piping systems.
ISO 5211 Actuator Mounting Pad: Top flange complies with ISO 5211 standard, compatible with pneumatic, electric and hydraulic actuators, supporting remote control and Emergency Shutdown (ESD).
Condition Monitoring Ports: The valve body is equipped with pressure and temperature monitoring ports, enabling predictive maintenance with intelligent sensors.
Technical Parameters
Size Range: NPS 4″ to 48″ (DN100 to DN1200)
Pressure Class: Class 150 to Class 2500 (PN20 to PN420)
Temperature Range: -29℃ to +425℃
Body: WCB, LCC, CF8, CF8M, F316, F51/F53 Duplex Stainless Steel
Ball/Seat Module: CF8M+ENP, F316+Stellite, Tungsten Carbide Coating, Inconel 625
Stem: SS316, 17-4PH, Inconel 718
Sealing Materials: RPTFE, Devlon, PEEK, Graphite, Stellite
End Connections: RF, RTJ, BW, Hub-Clamp, Grayloc, Techlok
Design Standards: API 6D, API 608, ASME B16.34
Applications
Long-distance Oil & Gas Pipelines: Used as critical block valves and station inlet/outlet valves. Quick replacement reduces gas transmission interruption losses, saving millions of dollars per single maintenance.
Offshore Platforms and FPSOs: Adapted to limited space and short maintenance windows, meeting the challenges of offshore operations.
LNG Terminals: Applied in high-pressure export systems, enabling quick maintenance under cryogenic conditions and avoiding BOG losses.
Continuous Chemical Production Plants: Installed at inlets and outlets of reactors and heat exchangers to minimize shutdown time and ensure continuous production.
Power Industry: Used in main steam systems, allowing rapid overhaul under high temperature and high pressure and reducing unplanned unit downtime.
Advantages & Values
Minimized Downtime: In-line quick replacement reduces maintenance from days to hours, greatly cutting losses from oil/gas transmission interruptions in critical pipelines.
Optimized Maintenance Costs: Factory-calibrated pre-assembled modules require no professional on-site assembly skills, reducing labor costs by more than 50%.
Consistent Sealing Performance: Factory pre-assembly ensures precise ball-seat matching, eliminating leakage risks caused by on-site assembly errors.
