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DN1000 PN63 A105 Extended Stem Fully Welded Ball Valve

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DN1000 PN63 A105 Extended Stem Fully Welded Ball Valve is a large-bore high-pressure fully welded ball valve engineered for major pipeline systems including long-distance transmission pipelines, urban gas distribution networks and district heating pipelines. Manufactured with ASTM A105 forged steel body and adopting an all-welded construction, the valve delivers zero body leakage. Equipped with an extended stem, it is optimised for buried installation as well as high and low-temperature harsh working conditions. Its monolithic welded design eliminates leakage vulnerabilities inherent to conventional flanged connections, enabling dependable long-term service under high-pressure and high-flow conditions. It is widely deployed in natural gas transmission, district heating networks and petrochemical industries.
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DN1000 PN63 A105 Extended Stem Fully Welded Ball Valve


Structural Features

ASTM A105 Forged Steel Body: The valve body is forged from premium ASTM A105 carbon steel featuring high tensile strength, superior toughness and outstanding pressure resistance for high-pressure service.

Fully Welded Construction: The monolithic all-welded body eliminates external leakage paths and removes leakage risks at flanged joints, securing consistent sealing performance throughout service life.

Large Bore Configuration: The DN1000 (40-inch) large bore design accommodates high-volume fluid conveyance and minimises pressure drop across pipeline systems.

Extended Stem Construction: The extended stem variant facilitates buried valve installation, installation under thermal insulation layers, and operation under extreme high/low temperature environments, enabling convenient above-ground operation and maintenance.

Trunnion-Mounted Ball Design: Built on a trunnion-mounted ball structure with upper and lower bearing supports, the valve maintains stable operation under high differential pressure with low operating torque and exceptional sealing performance.

Dual Sealing System: Primary sealing options include metal-to-metal hard seal or soft seat seal, with an in-built seat self-relief function to guarantee tight bi-directional shutoff.

Anti-Static Device: Built-in anti-static springs and steel balls establish continuous electrostatic conduction between ball, stem and valve body to prevent static accumulation and potential fire hazards.

Anti-Blowout Stem Structure: A shoulder-type anti-blowout stem with gland retainer prevents stem ejection under extreme operating conditions to safeguard operational safety.

Maintenance-Free Design: Combining fully welded body construction with premium sealing components, the valve delivers maintenance-free performance over its full service life and cuts overall operational expenses substantially.


Technical Specifications

Parameter Item

Specification

Nominal Diameter

DN1000 (40″)

Pressure Class

PN63 (Class 400)

Operating Temperature Range

Standard: -29℃ ~ +200℃; Optional: -46℃ ~ +350℃

Body Material

ASTM A105 Forged Steel

Ball Material

ASTM A105 with ENP (Electroless Nickel Plating) or stainless steel overlay welding

Stem Material

ASTM A182 F6a / 17-4PH Stainless Steel

Seat Material

RPTFE / PEEK / Metallic Hard Seal

Sealing Material

RPTFE, Graphite, Metallic Seal

End Connection

Butt Weld (BW) complying with ASME B16.25

Stem Type

Extended Stem

Operation Mode

Worm Gear Operator, Electric Actuator, Pneumatic Actuator, Gas-Hydraulic Actuator

Design Standards

API 6D, ASME B16.34, ISO 14313

Test Standards

API 6D, API 598, ISO 5208

Fire-Safe Standard

API 607 / ISO 10497

Leakage Class

Zero leakage per ISO 5208 Rate A / API 598

Face-to-Face Dimension

Customised in accordance with API 6D or client’s requirements


Application Scope

Long-Distance Natural Gas Transmission Pipelines: Used for mainline shutoff and off-take regulation on long-haul natural gas pipelines to secure safe and stable grid operation.

Urban Gas Distribution Systems: Applicable for city gas gate stations, pressure regulating stations and high/medium-pressure pipeline networks to achieve reliable gas shutoff and flow modulation.

District Heating Pipelines: Installed on primary and secondary circuits of municipal central heating systems for dependable isolation and flow regulation under high-temperature high-pressure hot water service.

Petrochemical Industry: Suitable for high-temperature high-pressure process piping in refineries and chemical plants to ensure stable and secure plant operation.

Power Generation Industry: Deployed in fuel supply and cooling water systems of thermal and gas-fired power plants to satisfy high-flow high-pressure working requirements.

LNG Receiving Terminals & Storage Facilities: Designed for process piping and cryogenic storage systems at LNG receiving terminals; paired with extended cryogenic stem design for reliable performance under ultra-low temperature conditions.


Advantages & Value

Advantage

Detailed Description

Zero-Leakage Assurance

The all-welded body eliminates all external leakage points. Paired with high-performance sealing system, it achieves lifelong zero leakage and meets stringent environmental and safety regulations.

High Pressure & High Flow Capacity

DN1000 large bore plus PN63 high pressure rating caters to high-flow and large differential pressure applications, reducing pipeline pressure drop and boosting transmission efficiency.

Buried-Installation Friendly

Extended stem design allows full underground burial of valves, reducing above-ground footprint and fitting urban pipeline and remote long-distance transmission projects.

Maintenance-Free Service

No external leak-prone joints on all-welded body plus wear-resistant sealing materials enable over 20 years of maintenance-free operation and drastically lower total lifecycle cost.

Safe & Stable Operation

Multi-layer safety configurations including anti-static, anti-blowout stem and fire-safe construction protect personnel and equipment against extreme abnormal working conditions.

Intelligent System Compatibility

Compatible with electric, pneumatic or gas-hydraulic actuators to support remote control and automated system integration for smart pipeline construction.

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