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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

China Suppliers Factory Class 600 Fully Welded Trunnion-Mounted DBB Ball Valve for Maximum Pipeline Safety

● Experience Zero External Leakage with Our Fully Welded One-Piece Body Valve, a top choice among China suppliers.

● Ensure Maximum Pipeline Safety with our advanced Double-Block-and-Bleed (DBB) technology, designed specifically for harsh environments.

● Achieve Stable High-Pressure Performance with our Trunnion-Mounted Ball Design, ideal for both underground and subsea applications.

● Our Fire-Safe Design comes equipped with an Emergency Sealing Capability to protect your operations.

● Benefit from Fail-Safe Operation featuring Anti-Blowout Stem and SPE/DPE options, ensuring reliability in critical situations.

● Our products are made from NACE MR0175-Compliant Materials, providing excellent performance in sour service conditions.

● Manufactured in our state-of-the-art factory, we design solutions for challenging pipeline environments worldwide.

Product Details

Key Features

Zero External Leakage

Fully welded one-piece body eliminates external leakage paths, ideal for subsea, underground, and harsh pipeline environments.

Stable High-Pressure Performance

Trunnion-mounted ball design ensures reliable operation under high-pressure conditions and enhances load-bearing stability.

Maximum Pipeline Safety

Double Block-and-Bleed (DBB) design provides secure isolation, safe maintenance, and enhanced operational safety.

Fail-Safe Stem with Anti-Static Protection

In critical and flammable applications, the anti-blowout stem with single or double piston effect (SPE/DPE) and built-in anti-static device ensures maximum safety.

Sour Service Capability

NACE MR0175-compliant materials guarantee reliable performance in sour, corrosive, and challenging service conditions.

Durable Sealing, Fire-Safe & Long-Term Reliability

Fire-safe design and advanced sealing technology ensure long-term performance and emergency sealing capability; available in full and reduced bore for optimized flow, supporting manual, electric, and pneumatic operation.

Frequently Asked Questions

Q What makes a fully welded ball valve better for subsea and underground pipeline applications?

A fully welded one-piece body eliminates external leakage paths entirely, making it far superior for subsea, underground, and other harsh environments where any form of external leakage is unacceptable. The robust construction also provides greater resistance to extreme pressure, temperature fluctuations, and corrosive conditions commonly found in these settings.

Q How does the trunnion-mounted ball design improve high-pressure performance?

In a trunnion-mounted ball valve, the ball is mechanically anchored at both the top and bottom by trunnions, which absorb pipeline pressure loads directly. This prevents the ball from shifting under high pressure, ensuring stable seat contact, reduced operating torque, and consistent sealing performance even under extreme pressure conditions.

Q What is Double Block-and-Bleed (DBB) and why is it important for pipeline safety?

Double Block-and-Bleed (DBB) refers to a valve configuration that provides two independent sealing surfaces against pipeline pressure, with a bleed port between them to verify isolation and release trapped pressure safely. This design is critical for safe maintenance operations, allowing technicians to confirm that both upstream and downstream sides are fully isolated before working on the system.

Q What does NACE MR0175 compliance mean for sour service applications?

NACE MR0175 is an internationally recognized standard specifying material requirements for equipment used in hydrogen sulfide (H₂S) environments, commonly found in oil and gas production. Compliance ensures that all metallic components are manufactured from materials resistant to sulfide stress cracking (SSC) and other forms of hydrogen-induced damage, guaranteeing safe and reliable operation in sour, corrosive service conditions.

Q What is the difference between Single Piston Effect (SPE) and Double Piston Effect (DPE) seat sealing?

Single Piston Effect (SPE) seats seal only from upstream pressure, meaning sealing force is generated from one direction. Double Piston Effect (DPE) seats can seal from both upstream and downstream pressure independently, providing more versatile and reliable sealing in bi-directional flow or variable pressure applications. DPE is commonly preferred in critical safety and high-risk environments for maximum protection.

Q What actuation options are available, and how do I choose between manual, electric, and pneumatic operation?

These valves support manual (handwheel/gear), electric (motorized actuator), and pneumatic (air-operated) actuation. Manual operation is suitable for infrequent use or low-criticality applications. Electric actuators are ideal for remote operation, automation systems, or locations without compressed air supply. Pneumatic actuators offer fast response times and are preferred in process plants or safety-critical applications requiring rapid valve action. The choice depends on your operational requirements, automation level, and available utilities.