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Home > Forged Steel Ball Valve > OEM Large Diameter Fully Welded Ball Valve for Natural Gas Transmission - China Suppliers & Factory Solutions Manufacturers, Factories
OEM Large Diameter Fully Welded Ball Valve for Natural Gas Transmission - China Suppliers & Factory Solutions Manufacturers, Factories
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OEM Large Diameter Fully Welded Ball Valve for Natural Gas Transmission - China Suppliers & Factory Solutions Manufacturers, Factories

OEM Large Diameter Fully Welded Ball Valve for Natural Gas Transmission - China Suppliers & Factory Solutions Manufacturers, Factories

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√ Designed for Critical Natural Gas Transmission Infrastructure in China
, √ Monoblock Fully Welded Body ensures Zero External Leakage in Underground Applications
, √ Heavy-Duty Trunnion Design guarantees Stability for High-Pressure Pipelines
, √ Capable of Extra-Large Diameters up to DN1200 and Beyond
, √ Crafted from Low-Temperature Impact Tested Steel, ideal for Cold Climate Pipelines
, √ Our Factory provides Project-Level Manufacturing Strength and Custom Engineering Support, making us a leading choice among Suppliers in the industry

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Product Description

Key Features
Monoblock Fully Welded Construction

Eliminates external leakage paths and enhances long-term sealing integrity for critical gas transmission pipelines.

Heavy-Duty Trunnion Mounted Design

Ensures pressure-balanced sealing stability and reliable shut-off performance in large diameter pipeline applications.

Engineered for Extra-Large Diameters

Structural reinforcement and optimized internal design maintain rigidity and alignment in oversized valve configurations up to DN1200 and beyond.

Pipeline-Grade Double Block & Bleed

Provides secure isolation, cavity pressure relief, and verification capability for safe gas transmission operations.

Fire-Safe & Anti-Static Protection

Designed to meet emergency sealing requirements and ensure operational safety in hazardous gas environments.

Long-Term Gas Infrastructure Service

Advanced welding procedures, NDE inspection, and full testing ensure durability and infrastructure-level reliability.

Frequently Asked Questions
What is a monoblock fully welded ball valve and why is it preferred for gas transmission? +
A monoblock fully welded ball valve features a one-piece body with no bolted connections, which eliminates potential external leakage paths. For gas transmission pipelines, this design provides superior long-term sealing integrity, making it the preferred choice for high-pressure and safety-critical applications.
How does the trunnion mounted design improve performance in large diameter pipelines? +
The trunnion mounted design mechanically supports the ball at both top and bottom, preventing it from being pushed against the downstream seat by line pressure. This enables pressure-balanced sealing, reduces operating torque, and ensures highly reliable shut-off performance — especially critical in large diameter and high-pressure applications.
What size range is supported for extra-large diameter valves? +
These valves are engineered to support sizes up to DN1200 and beyond. Extra-large diameter configurations incorporate structural reinforcement measures and an optimized internal geometry to maintain full rigidity and precise ball-seat alignment under high load conditions.
What does the Double Block & Bleed (DBB) function provide? +
The Double Block & Bleed function provides dual seating isolation from both upstream and downstream pressure simultaneously, combined with a bleed port for cavity pressure relief. This enables safe maintenance and system integrity testing without shutting down the entire pipeline.
Are these valves certified to fire-safe and anti-static standards? +
Yes, the valves are designed and tested to meet recognized fire-safe standards (such as API 607 / API 6FA). Anti-static devices are incorporated to provide continuous electrical continuity between the ball, stem, and body, preventing static charge buildup in hazardous environments.
What quality control procedures ensure long-term reliability? +
Each valve undergoes rigorous quality assurance including advanced welding procedures, Non-Destructive Examination (NDE) such as radiographic and ultrasonic testing, and comprehensive in-house hydrostatic and pneumatic testing to ensure infrastructure-level durability.

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