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J-VALVES
Design Features
Stainless Steel Construction: Valve body is forged from austenitic stainless steel (ASTM A182 F304/F316/F316L) or duplex stainless steel (F51/F53), delivering excellent corrosion resistance, oxidation resistance and high-temperature strength. Suitable for corrosive media such as acids, alkalis, salts and chlorides.
Socket-Weld (SW) Connection: Valve body ends feature socket-weld design. Pipes are inserted into the body socket and circumferentially welded to form a high-strength permanent joint with no leakage paths. It provides outstanding high-pressure and vibration resistance, ideal for high-pressure pipelines with limited space.
Forged Body Structure: Manufactured with integral forging process, resulting in dense grain structure and superior mechanical properties compared to castings, free from casting defects, suitable for high-pressure classes (Class 800/1500/2500).
Wedge-Type Flexible Wedge: Integral stainless steel wedge with a flexible slot in the middle achieves self-energized sealing under media pressure, compensating for thermal expansion and minor wear of sealing surfaces to ensure long-term reliable shut-off.
Fully Guided Stem Design: Upper guide bush between stem and bonnet, and lower guiding structure between stem and wedge ensure precise alignment during operation, preventing galling and damage to sealing surfaces.
Stem Sealing System: Equipped with flexible graphite braided packing or PTFE packing, combined with live-loaded packing gland, adaptable to high-temperature and high-pressure conditions. Low-emission packing is available to meet environmental requirements.
Blowout-Proof Stem & Back Seat: Stem is designed with an anti-blowout shoulder at the bottom. In the fully open position, the stem boss forms a metal-to-metal seal with the bonnet back seat, allowing online packing replacement under pressure and enhancing safety.
Compact Design: Small in size and light in weight, suitable for space-restricted installations such as instrument panels, skid-mounted equipment and laboratory units.
Optional Extended Bonnet: For high-temperature service, an extended bonnet is available to keep the packing area away from heat flow, protecting the packing and operating personnel.
Technical Specifications
Size Range: NPS 1/4″ to 2″ (DN8 to DN50)
Pressure Class: 150LB to 2500LB (PN20 to PN420)
Temperature Range: -29℃ to +425℃
Body/Bonnet: ASTM A182 F304, F316, F316L, F321, F347; F51, F53 duplex stainless steel
Wedge: F304, F316, F316L with Stellite overlay, solid carbide
Stem: F304, F316, 17-4PH, XM-19
Seat: Body with Stellite overlay, F316 with carbide, renewable seat rings
Packing: Flexible graphite, PTFE, graphite reinforced with Inconel wire
End Connections: Socket-Weld (SW) conforming to ASME B16.11; optional Butt-Weld (BW) or NPT threaded
Operation: Manual (handwheel), small-size gear operator, electric (miniature actuator)
Design Standards: API 602, ASME B16.34
Testing Standard: API 598
Applications
Petrochemical Industry: Isolation of media in high-pressure instrument lines, sampling lines, vent lines and chemical injection lines in refineries and chemical plants.
Power Industry: Instrument isolation and small-bore process piping for high-temperature and high-pressure steam, feedwater and condensate systems in thermal power plants and nuclear power plants.
Oil & Gas Industry: High-pressure small-bore pipelines in wellheads, Christmas trees and gathering stations, as well as corrosion-resistant service in sour oil and gas fields.
Offshore Engineering: High-pressure hydraulic systems, chemical injection systems and instrument air systems on offshore platforms and vessels.
Analytical Instrument Systems: Sample pretreatment systems for on-line analyzers and precise control of high-pressure gas/liquid pipelines.
Advantages & Value
Reliable High-Pressure Sealing: Full-circumference socket-weld eliminates connection leakage paths, and forged stainless steel body provides high pressure-bearing capacity, suitable for Class 2500 high-pressure service.
Excellent Corrosion Resistance: Austenitic and duplex stainless steels cover a wide range of corrosive environments, extending valve service life and reducing replacement costs.
High Space Efficiency: Compact socket-weld design saves over 70% installation space compared to flanged valves, ideal for dense pipe racks and skid-mounted units.
Operational Safety: Multiple safety designs including blowout-proof stem, back seat and live-loaded packing enable online maintenance, ensuring personnel and equipment safety.
Standardization & Interchangeability: Complying with international standards such as API 602, compatible with global high-pressure small-bore valve systems with high spare parts universality.
Flexible Configuration: A wide selection of stainless steel grades, pressure classes, sealing types and actuation methods to meet diverse applications from cryogenic liquid oxygen to high-temperature steam.
