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J-VALVES
Design Features
Premium Stainless Steel Construction: Valve body available in CF8 (304), CF8M (316), CF3M (316L) or forgings F304/F316, delivering excellent resistance to general corrosion, pitting and stress corrosion cracking, suitable for corrosive and clean media.
Large‑Bore Design: Covers DN200 to DN600 (8″ to 24″) large‑bore range, constructed with cast or forged‑welded structure to meet high‑flow operating conditions.
Straight‑Through / Angle Body: Standard Y‑type or T‑type body design with optimized flow passage to reduce pressure drop; angle body available for installation in space‑restricted areas.
Rising Stem & Disc: Integral or external stem nut design, replaceable disc structure supporting flat or conical sealing to ensure tight shut‑off.
Handwheel Operation: Large‑diameter handwheel with precision Acme thread or ball screw stem for easy operation and intuitive, controllable stroke; gearbox available to reduce operating torque.
Flanged Connections: RF (Raised Face), RTJ (Ring Type Joint) or FF (Flat Face) flanges complying with ASME B16.5 / B16.47 Series A/B, pressure ratings Class 150LB to 600LB.
Seat Sealing Technology: Body Stellite hardfacing or insert seat design, resistant to erosion and galling, allowing in‑line lapping and repair.
Optimized Guiding: Double upper‑and‑lower disc guiding or cage guiding to prevent vibration and noise under high pressure differential, ensuring stable performance.
Optional Bellows Seal: Bellows seal structure available for toxic, flammable or valuable media to achieve zero fugitive emission.
Position Indication & Locking: Standard stem stroke indicator, with optional position indicator disc, limit switches or locking device to meet safety regulations.
Technical Specifications
Size Range: 8″ to 24″ (DN200 to DN600)
Pressure Rating: Class 150LB to 600LB (PN20 to PN100)
Temperature Range: -29℃ to +425℃
Body: CF8, CF8M, CF3M, CK20 (310), CN7M (Alloy 20), forgings F304/F316/F316L
Disc / Seat: 316 stainless steel with Stellite hardfacing, solid carbide, Monel, Inconel
Stem: 316 stainless steel, 17‑4PH precipitation hardening stainless steel, XM‑19 nitrogen‑strengthened stainless steel
Packing: Flexible graphite, PTFE, low‑emission graphite ring set (compliant with ISO 15848‑1 BH)
Gaskets: Spiral wound gaskets (304/316 + graphite), metallic ring gaskets (octagonal, oval)
End Connections: Flanged (RF/RTJ/FF), Butt‑Weld (BW), Socket‑Weld (SW, for small sizes)
Operation: Handwheel (standard), chain wheel (elevated installation), bevel gearbox, electric actuator, pneumatic actuator
Flow Characteristic: Linear or equal percentage (for modulating service)
Design Standard: ASME B16.34, BS 1873
Inspection & Test Standard: API 598
Face‑to‑Face Dimension: ASME B16.10
Applications
Oil & Gas Industry: Used in large‑bore main pipelines for crude oil, refined products and natural gas in long‑distance pipelines, oil & gas gathering and transportation, and refineries for process switching and flow regulation.
Chemical & Petrochemical: Suitable for large reactor inlets and outlets, heat exchanger bypasses, and tower inlet/outlet pipelines in ethylene, propylene, aromatic and other units, performing reliably in corrosive and high‑temperature services.
LNG & Cryogenic Engineering: BOG and low‑pressure transfer pipelines at LNG terminals, vaporizing stations and storage facilities, ensuring stable operation at -196℃ cryogenic temperature.
Shipbuilding & Offshore Engineering: Ballast water, cooling water and bilge water systems on large vessels; production water and water injection pipelines on offshore platforms.
Advantages & Value
Precise Flow Control: Globe valve features excellent inherent flow characteristic, ideal for modulating service with nearly linear relationship between opening and flow, superior to the on‑off performance of gate valves.
Reliable Bi‑Directional Sealing: Metal or soft sealing between disc and seat achieves bubble‑tight shut‑off, meeting process isolation and environmental emission requirements.
Large‑Bore Manufacturing Capability: Advanced casting or forged‑welded structure solves casting defects of large‑bore stainless steel bodies, ensuring uniform wall thickness and structural integrity.
Safety & Environmental Compliance: Low‑emission packing design complies with stringent environmental regulations such as EPA Method 21; bellows seal option enables zero emission to protect personnel and environment.
Flexible Configurations: Modular design supports customization from manual to automated actuation, ambient to cryogenic temperature, and standard to zero‑leakage performance to meet project‑specific requirements.
