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Forged Reduced Bore Trunnion Mounted Ball Valve with Lockable Lever Handle

High-Integrity Double Ball DBB Trunnion Mounted Valve

Forged Double Ball DBB Valve with Dual Gear Operation

Large Diameter Fully Welded Ball Valve for Natural Gas Transmission Pipeline

Fully Welded Flanged Trunnion Mounted Ball Valve

High-Temperature Hard-Seal Fixed Ball Valve with DBB Structure

Durable High-Temperature Floating Ball Valve for Severe Environments (Up to 500°C)

Cryogenic Reduce Port Floating Ball Valve with Locking Device

Cryogenic Top Entry Floating Ball Valve with Extended Stem

Hydraulic Scotch Yoke Actuated Flanged Type Trunnion Mounted Ball Valve

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

√ 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

Product Details

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 Function

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.

Built for Long-Term Gas Infrastructure Service

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

Frequently Asked Questions

What is a monoblock fully welded ball valve and why is it preferred for gas transmission pipelines?

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 valve 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 pipeline applications.

What size range is supported, and how are extra-large diameter valves structurally reinforced?

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, preventing deformation or misalignment under high load and pressure conditions.

What does the Double Block & Bleed (DBB) function provide in gas pipeline operations?

The Double Block & Bleed function provides dual seating isolation from both upstream and downstream pressure simultaneously, combined with a bleed port that allows cavity pressure relief and pressure verification. This enables safe maintenance, system integrity testing, and secure isolation during gas transmission operations without shutting down the entire pipeline.

Are these valves certified to fire-safe standards, and what anti-static measures are included?

Yes, the valves are designed and tested to meet recognized fire-safe standards (such as API 607 / API 6FA), ensuring secondary metal-to-metal sealing is maintained in the event of fire damage to soft seats. Anti-static devices are incorporated to provide continuous electrical continuity between the ball, stem, and body, preventing static charge buildup in hazardous gas environments.

What quality control and testing procedures ensure the long-term reliability of these valves?

Each valve undergoes a rigorous quality assurance process including advanced welding procedures compliant with recognized codes, Non-Destructive Examination (NDE) such as radiographic and ultrasonic testing on welds, and comprehensive in-house hydrostatic and pneumatic testing. This ensures every unit meets infrastructure-level durability, minimizes maintenance requirements, and delivers consistent long-term performance throughout its service life.