F304 Austenitic‑Stainless‑Steel Construction: The valve body is manufactured from ASTM A351 CF8 (F304) or ASTM A182 F304 austenitic stainless steel. Boasting excellent corrosion resistance, it accommodates numerous chemical media and atmospheric‑corrosion‑prone environments.

Special 5.5‑Inch Bore: This non‑standard custom bore (approximately DN140) sits between standard DN125 (5‑inch) and DN150 (6‑inch) sizes. Custom‑built for individual project specifications, it meets unique flow‑rate and installation‑space requirements.

PN300 High‑Pressure Rating: Its pressure class is comparable to ANSI Class 2000 for medium‑to‑high‑pressure service. Reinforced wall thickness, fastening bolts and sealing architecture are engineered for harsh high‑pressure operating conditions.

Flanged or Butt‑Weld End Connections: Sealing faces include RF (Raised Face) and RTJ (Ring‑Type Joint) flanged ends, alongside BW (Butt‑Weld) ends compliant with EN 1092‑1 and ASME B16.5 to guarantee dependable connection performance under high‑pressure service.

Pressure‑Seal Bonnet for High‑Pressure Service: The PN300 version adopts a self‑energising pressure‑seal bonnet. Sealing tightness improves with rising process‑medium pressure, delivering stable sealing capability for high‑pressure working conditions.

Fire‑Safe Construction: The valve complies with API 607. Its metal‑to‑metal sealing interface maintains sealing integrity during fire incidents and stops process‑medium leakage.

Anti‑Blow‑Out Stem Structure: The top‑mounted anti‑blow‑out stem assembly incorporates shaft shoulders and retaining circlips. It prevents stem ejection triggered by abnormal internal pressure and safeguards operational safety.

Back‑Seal Design: A metal‑to‑metal back‑seal forms between the stem and bonnet once the valve reaches the fully‑open position. This enables online packing replacement without system depressurisation.

Inspection and Test Standard: API 598

Buried Pipeline Systems: It serves as a surface‑operated shut‑off unit for underground trunk pipelines of city gas, heat‑supply networks and water‑drainage infrastructure. It minimises valve‑chamber dimensions or removes the requirement for valve pits and cuts civil‑engineering expenditure.

Cryogenic Storage and Transportation Facilities: Installed at tank nozzles, loading‑offloading arms and pipe bridges for LNG, liquid nitrogen, liquid oxygen and liquid argon, the long stem enables remote actuation and prevents packing assembly freezing.

Zones Adjacent to High‑Temperature Equipment: It isolates pipelines around boilers, furnaces and chemical reactors and shields operators from thermal radiation hazards.

Insulated Pipeline Networks: The extended stem penetrates thermal‑insulation layers on high‑temperature high‑pressure steam and hot‑oil pipelines for convenient operation and maintenance.

Chemical and Petrochemical Industries: It isolates underground or equipment‑adjacent pipelines carrying corrosive, toxic and hazardous process fluids and ensures safe manipulation.

Offshore Platforms and Marine Vessels: The valve accommodates confined‑space pipeline operation beneath offshore‑platform decks and inside ship compartments.

Tunnels and Utility Pipe Galleries: It is deployed within comprehensive utility corridors, power tunnels and highway‑railway tunnels to implement ground‑based remote pipeline operation.

General‑Industrial Service: It delivers reliable fluid shut‑off for every special installation scenario demanding stem extension, remote actuation or thermal isolation.

Adaptability for Specialised Installation Environments: The extended‑stem design tackles operational obstacles from underground burial, cryogenic conditions, high‑temperature radiation and confined layouts. Expensive valve pits and protective enclosures can be omitted.

Cost‑Effective Corrosion‑Resistant F304 Material: This austenitic stainless steel resists an extensive range of corrosive media and provides superior cost‑performance compared to F316 for most corrosive environments.

Flexible Custom‑Engineered Non‑Standard Bore: The unique 5.5‑inch size satisfies bespoke flow‑rate and spatial constraints, with custom non‑standard dimensions available upon project demand.

Convenient On‑Site Maintenance: The back‑seal structure permits packing replacement under working pressure. Flanged and welded ends streamline installation, and the stem sleeve guards the elongated stem against external damage.

Smooth Automation Integration: Standardised mounting flanges and shaft couplings are fitted to the top of the extended stem for seamless fitting of diverse actuators, supporting remote monitoring and automated valve control.

Stable Guided Structure: Intermediate guiding supports prevent deflection of the lengthy stem, guaranteeing smooth opening‑closing movement and sustained sealing performance under high length‑to‑diameter ratios.

Broad Service Compatibility: Multiple stainless‑steel grades, sealing configurations, custom stem lengths and actuation choices cover working conditions spanning ultra‑low temperature to extreme heat, underground and overhead layouts, clean service and corrosive media.

International‑Standard Compliance: Designed and manufactured in strict accordance with API 600, ASME, EN, ISO and other global specifications, the valve meets procurement criteria for international projects. Supplied documentation encompasses EN 10204 3.1 / 3.2 material certificates, extended‑stem deflection calculation reports, low‑emission test records and NACE compliance certifications.