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J-VALVES
Structural Features
Trunnion Mounted Design: The ball is fixed by upper and lower trunnions and does not float under medium pressure. Sealing is achieved by spring-loaded seats or piston effect, which significantly reduces operating torque. It is suitable for high-pressure and large-bore conditions and eliminates jamming of floating ball valves under high pressure.
High Output Torque: Hydraulic pressure is typically 10~35 MPa, with output torque up to hundreds of thousands of N·m, easily driving ultra-high-pressure large-bore valves up to 56"/Class 2500.
Fast Response: Opening and closing time is adjustable from 1 to 30 seconds, meeting the rapid response requirements of Emergency Shutdown (ESD).
Precise Control: Equipped with proportional valves and servo systems to realize modulating control and accurate position feedback.
Double-Acting: Hydraulically driven for both opening and closing, with symmetric output torque and flexible control.
Single-Acting Spring Return: Opened by hydraulic power and closed by spring energy storage; automatically shuts safely upon pressure loss, satisfying fail-safe requirements.
Integrated Hydraulic Control System: Includes hydraulic power unit, accumulator, control valve manifold, filter, pressure sensor, etc. Supports multiple control modes: local manual, remote automatic, and emergency shutdown.
ESD Emergency Shutdown Function: Upon receiving an emergency signal, the accumulator releases high-pressure oil instantaneously, and the valve closes rapidly within seconds to ensure pipeline safety.
Valve Position Feedback & Monitoring: Fitted with limit switches, 4~20mA position transmitters and smart positioners for remote valve position monitoring and fault diagnosis.
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) design adapts to different pressure relief requirements.
Full Bore or Reduced Bore Design: Full bore features nearly zero flow resistance and allows pig passage; reduced bore lowers costs for general shut-off service.
Anti-Static and Fire-Safe Design: Conductive connection between stem, ball and body; fire-safe certified to API 607/6FA, maintaining sealing integrity after fire exposure.
Wide Material Range: Body materials include WCB, LCC, F304/F316/F316L, F51/F53 duplex stainless steel, Inconel, etc., suitable for conventional to extreme corrosive conditions.
Technical Parameters
Size Range: NPS 6″ to 60″ (DN150 to DN1500)
Pressure Class: Class 150 to Class 2500 (PN20 to PN420); commonly Class 600/900/1500 (PN100/150/260)
Hydraulic System Pressure: 10 MPa, 16 MPa, 21 MPa, 35 MPa (standard); custom up to 70 MPa
Temperature Range: -29℃ to +425℃
Body: WCB, LCC, F304, F316, F316L, F51 (2205), F53 (2507), Inconel 625
Ball: F316+ENP, F316+Stellite, Inconel 625 overlay, tungsten carbide coating
Seat: RPTFE, Devlon V-API, PEEK, SS316+graphite, Inconel+Stellite
Trunnion/Bearing: SS316, 17-4PH, Inconel 718, Devlon V bushing
Stem: SS316, 17-4PH, Inconel 718
Packing: Flexible graphite, low-temperature graphite
Hydraulic Actuator: Carbon steel or stainless steel cylinder, chrome-plated piston rod, NBR/Viton seals
End Connections: RF, RTJ, BW, conforming to ASME B16.5/B16.25; API 6D pipeline valve ends
Design Standards: API 6D, API 608, ASME B16.34
Testing Standards: API 6D, API 598
Applications
Emergency Shutdown (ESD) for Long-Distance Oil & Gas Pipelines: Installed in mainline block valve rooms and station inlets/outlets. Rapid shut-off within 3~15 seconds upon pressure loss or accident to prevent escalation.
Subsea Pipelines & Offshore Platforms: Remote control for subsea production systems, manifolds and risers. Hydraulic actuation meets subsea high-pressure and explosion-proof requirements.
Large Gas/Oil Storage Facilities: High-pressure large-bore control for injection/production wells and tank inlets/outlets. ESD function ensures storage safety.
LNG Plants: Large valve control for high-pressure natural gas pretreatment, liquefaction and export systems. Cryogenic type suitable for -196℃.
High-Pressure Coal Chemical Systems: High-pressure high-flow control for coal gasification, syngas purification and methanol synthesis, resistant to media containing solid particles and corrosive substances.
Large Chemical Plants: Control for high-pressure reactors and separation systems in ethylene cracking, polyethylene and polypropylene units.
Hydropower & Pumped Storage Plants: Fast shut-off and flow regulation for high-pressure water diversion and tailrace systems.
Advantages & Values
Only Choice for Ultra-High-Pressure Large-Bore Valves: Hydraulic output torque is over 10 times that of pneumatic/electric actuators, making it the only feasible drive solution for 56"/Class 2500 ultra-high-pressure valves.
Control Accuracy & Stability: Hydraulic system features high rigidity and fast response. With servo control, it achieves higher precision regulation than pneumatic and electric systems.
Comprehensive Fail-Safe Design: Multiple safety mechanisms including spring return, accumulator energy storage and pressure loss protection ensure the valve remains in safe status under any failure mode.
Subsea & Underwater Adaptability: Hydraulic actuation enables easy remote control via umbilical cables, adapting to extreme deep-sea environments such as high pressure, corrosion and marine growth.
