Fully Welded Ball Valve

Fully welded ball valve is a device to control pipeline system in full opening and closing. It is a ball valve in which the valve body and the pipeline are welded as a whole. It is opened and closed by rotating the ball 90° around the axis of the valve stem. When the seal fits tightly, the medium is cut off and valve is closed; when the through hole of the ball is aligned with the channel, the medium flows and valve is opened. This valve is composed of a carbonized Teflon sealing ring and a disc spring, so it has a strong adaptability to changes in pressure and temperature. It will not produce any leakage within the marked pressure and temperature range. It has strong sealing, pressure resistance and corrosion resistance, compact structure and long service life. So widely used in high-pressure, high-corrosion long-distance pipelines and industrial pipeline systems such as oil, natural gas, and urban heating.

Design Feature：

Body and bonnet welded integral

Full bore / Reduce bore

Cavity pressure self relief

Double block and bleed

Sealant injection at seat and stem

Anti-static design

Fire safe design

Extended stem design

Zero leakage

Production Standard：

Design	API 6D
Face to Face	API 6D / ASME 16.10
Flange End	ASME B16.5 / ASME B16.47 / GOST 33259
Butt-welding End	ASME B16.25
Test	API 598 / API 6D
Fire Safe	API 607 / API 6FA
NACE	MR 0175

Technical Specification：

Size	2” ~ 48”
Class	150Lb ~ 900Lb
Connection	Double Flange / Butt Weld
Operation	Worm Gear / Pneumatic Actuator / Electric Actuator / Hydraulic Actuator
Temperature	-60°C to +120°C
Application	Oil and Gas Transmission

Material Option：

Body	A105 / LF2
Ball	A105+ENP / LF2+ENP / F304 / F316
Stem	F6a / 17-4PH / F316
Soft Seat	RPTFE / PEEK / Nylon / Devlon

Technical Advantages:

Temperature & Pressure Adaptability: Utilizing a carbonized Teflon sealing ring and disc springs, this all welded ball valve easily withstands fluctuating line temperature and pressures.

Advanced Cavity Self-Relief: Features automatic internal pressure relief and double block and bleed (DBB) capabilities to ensure maximum safety.

Underground Extension Capabilities: Built as a ball valve with extended stem configuration, allowing for efficient deep-buried installation and easy surface operation.

Premium Factory Customization: As professional fully welded ball valve manufacturers, Tipvalve offers full or reduced bore options with emergency sealant injection systems.

Versatile Applications:

Long-Distance Oil Pipelines: High-performance fully welded ball valve engineered to withstand harsh external environments in crude oil transmission networks.

Natural Gas Transmission: The definitive choice for high-pressure gas pipeline headers, compressor stations, and bulk gas distribution infrastructure.

Urban District Heating: Reliable thermal control units designed to manage high-temperature water and steam circulation loops for municipal heating systems.

Buried Subsurface Infrastructure: Perfect for underground city gas grids and subterranean pipelines where structural maintenance access is severely limited.

High-Corrosion Processing Lines: Specialized industrial transport pipelines handling aggressive chemicals, corrosive fluids, and volatile petrochemical media.

FAQs:

What is a fully welded ball valve?
A fully welded ball valve features a unified body structure, eliminating potential external casing leak paths for maximum pipeline safety.

Where are these valves typically installed?
This all welded ball valve design is highly preferred for buried gas transmission lines and urban district heating networks.

What are the structural advantages of a welded body ball valve?
A welded body ball valve offers a compact, lightweight profile, superior structural strength against pipeline stresses, and zero risk of body gasket failure over time.

When do I need a ball valve with extended stem?
A specialized ball valve with extended stem is required for underground or cryogenic installations, bringing the actuator or gear operator safely above ground or insulation.

Why work with certified fully welded ball valve manufacturers?
Leading fully welded ball valve manufacturers ensure precise material tracking, rigorous non-destructive testing (NDT) on welds, and strict compliance with API 6D pipeline standards.

How does this valve support advanced system isolation?
Our design incorporates dual seats to achieve true double block and bleed performance. Learn more about what a double block and bleed valve is in our technical guide.

What body materials are available for this series?
We utilize high-strength forged carbon steels like ASTM A105 or LF2 to ensure optimal weldability, structural uniformity, and exceptional low-temperature impact toughness.

What type of seat sealing is utilized?
We offer a resilient primary seat backed by emergency sealant injection fittings, ensuring a reliable bubble-tight shutoff even if the seal faces sustain minor particle damage.

Is a fire-safe design standard for these units?
Absolutely. Our fully welded ball valves are strictly tested and certified to API 607 and API 6FA standards, guaranteeing critical sealing integrity during external fire emergencies.