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J-VALVES
Design Features
Forged Carbon Steel Construction: The valve body is made of ASTM A105N forged carbon steel. Normalization treatment refines grains, improves toughness, and delivers a dense microstructure with uniform mechanical properties. Its pressure-bearing capacity is superior to cast steel, making it suitable for high-pressure small-bore applications and critical service conditions.
Straight-Through Globe Valve Structure: The body flow passage features an S-shaped or angular design. The disc moves vertically along the centerline of the seat, resulting in short opening/closing strokes and minimal sealing surface wear, ideal for frequent operation and precise throttling control.
Disc & Seat Sealing: The disc is replaceable. The sealing surfaces are hardfaced with Stellite alloy or treated with body hardening, providing excellent erosion and wear resistance while maintaining reliable sealing after repeated cycles.
Flange Connection: RF (Raised Face) flanges are applied in accordance with ASME B16.5, Class 150 (PN20). It offers high installation compatibility and easy connection to standard piping systems.
Packing Sealing System: Multi-layer PTFE, flexible graphite or braided packing is used, with a gland follower for adjustable compression force. This ensures long-term leak‑tightness at the stem, and packing can be replaced online.
Handwheel Operation: Standard handwheel mechanism, clockwise to close, counterclockwise to open. It features moderate operating torque and visual indication of valve position, suitable for local frequent adjustment.
Compact & Lightweight: The 3/4-inch small-bore forged steel structure ensures a compact size and light weight, facilitating installation in instrument panels, skid-mounted equipment and dense piping layouts with limited space.
Technical Parameters
Nominal Diameter: 3/4" (DN20)
Pressure Class: Class 150 (PN20)
Temperature Range: -29℃ to +425℃
Body/Bonnet: ASTM A105N forged carbon steel (normalized)
Disc: A105N with Stellite hardfacing, or 13Cr stainless steel
Seat: A105N with Stellite hardfacing, or body-hardened
Stem: 410/420 stainless steel or 17-4PH precipitation hardening stainless steel
Packing: Flexible graphite, PTFE, braided graphite
Gasket: Spiral-wound gasket (inner & outer ring), graphite composite gasket
End Connection: Flanged (RF, ASME B16.5)
Operation: Handwheel (standard), optional gear operator, pneumatic or electric actuator
Design Standard: ASME B16.34, API 602
Inspection & Test Standard: API 598
Face-to-Face Dimension: ASME B16.10
Applications
Oil & Gas Industry: Used in instrument lines, sampling systems, chemical injection lines, blowdown and pressure relief systems at wellheads, gathering stations and processing plants for precise flow control and reliable shut-off.
Chemical Industry: Suitable for flow regulation, bypass control, venting and sampling points in process pipelines, handling general chemical media and hydrocarbon fluids.
Power Industry: Applied in instrument tubing, steam sampling, drain systems and auxiliary process lines in thermal power plants and nuclear power stations.
Shipbuilding & Offshore Engineering: Used for piping control of fuel oil, lubricating oil, cooling water and compressed air systems on vessels, complying with classification society requirements.
General Industry: Suitable for throttling, on/off control and reliable isolation of water, oil, gas, steam and other media.
Advantages & Values
Excellent Precise Regulation: The linear flow characteristic of globe valves enables fine flow control even at small openings, outperforming the equal percentage characteristic of ball valves, especially for throttling applications.
Reliable Sealing & Tight Shut-Off: Metal-to-metal or soft sealing between disc and seat ensures stable sealing performance after repeated operation, with leakage rate achieving API 598 zero leakage or ISO 5208 Rate A/B.
Superb Forged Steel Pressure Resistance: A105N forged steel features dense structure free of casting defects. With improved toughness after normalization, it provides high safety margins in small-bore high-pressure service and longer service life than cast steel valves.
Intuitive Operation & Easy Maintenance: Handwheel operation allows clear position indication. The stuffing box can be tightened or repacked online; discs and seats are individually replaceable, reducing lifecycle costs.
Flexible & Standardized Installation: Flanged ends are fully compatible with standard pipelines. The 3/4" small size enables dense arrangement, ideal for instrument panels, skids and space‑constrained areas.
Flow Direction for Sealing Protection: Low-inlet high-outlet flow design uses medium pressure to assist sealing, reducing closing torque and preventing direct erosion of sealing surfaces by high‑velocity fluid.
Remarkable Cost-Effectiveness: Forged steel construction ensures controllable manufacturing costs for small-bore valves. Class 150 rating covers most medium and low‑pressure applications, delivering better cost performance than stainless steel and high-pressure class products.
