A fully welded ball valve features a unified outer casing design with no external bolt or flange connections in the valve body shell. This structural configuration is specifically engineered to eradicate any potential pathway for fugitive emissions or fluid leakage to the environment. This makes them the industry standard for underground municipal pipelines, high-pressure natural gas distribution networks, and critical thermal transport lines.
By eliminating bolted body joints, these valves offer superior mechanical strength under pipeline bending loads, temperature shocks, and environmental vibrations. When compared to split-body or top-entry options, the monoblock welded body guarantees maximum structural integrity, reducing long-term maintenance costs to virtually zero over multi-decade lifespans.
Our valves are manufactured and certified to match strict global parameters for gas networks, district heating, and process plant piping configurations.
| Parameter / Specification | Standards & Limits | Materials & Technical Capabilities |
|---|---|---|
| Nominal Size Range (DN) | DN15 to DN1400 (1/2" to 56") | Forged Steel body suited for pipeline integration. |
| Pressure Ratings (PN / Class) | PN10 to PN160 / Class 150 to Class 900 | Custom pressure profiles available upon request. |
| Design & Manufacturing Standards | API 6D, ASME B16.34, EN 14141, EN 1983 | Full conformance to global infrastructure standards. |
| Body Materials | ASTM A105, A350 LF2, P355GH, GP240GH, CF8M | Low-temperature and carbon steel options for diverse climates. |
| Ball Seat Ring System | PTFE + C, PEEK, Devlon, Metal-to-Metal | Self-relieving or Double Piston Effect (DPE) seat designs. |
| Operation Methods | Manual Lever, Worm Gear, Pneumatic, Electric Actuation | Compatible with direct buried extension stems. |
| Fire-Safe Certification | API 607, API 6FA | Certified thermal integrity for hazardous areas. |
Years of Engineering Experience
Valve Varieties Manufactured
Global Export Countries
Zero-Leakage Inspection Standard
KR (KR VALVE GROUP) brings over 20 years of expertise in manufacturing both standard and custom-engineered valves. Providing comprehensive B2B supply lines to thousands of international buyers, our product catalog contains over 500 distinct valve lines. This includes butterfly valves, gate valves, check valves, and water control systems designed for complex water distribution networks, petrochemical facilities, massive dams, and central energy grids.
We are dedicated to building sustainable, high-value supply lines. We maintain over 30 sets of advanced heavy-duty machining and testing equipment. This infrastructure is regularly updated to guarantee high-precision output across all product runs. By strictly following ISO 9001 guidelines, we ensure all components match or exceed client expectations.
Key Highlights of Our Operations:
KR valve production workshop with state-of-the-art testing equipment.
Wide product selection including butterfly valves, gate valves, and accessories.
Supplying custom solutions for municipal and industrial projects globally.
Our R&D department ensures product design and continuous innovation. Technicians continuously design and develop products that meet customer and market requirements. Our lab provides extensive testing capabilities to elevate performance. We currently have 20 series and over 500 varieties.
The production department formulates production plans and schedules to ensure timely delivery according to customer requirements. Products are manufactured under strict supervision in accordance with the ISO-9001 quality management system. We use over 30 production machines and update inventory monthly.
Our QC department ensures 100% inspection quality of products. Zero leakage is our core principle. According to international quality inspection standards, we conduct a series of tests on appearance, dimensions, pressure, and more, issuing reports in compliance with global standards.
We offer our independent brand "KR" alongside robust OEM/ODM services, maintaining long-term partnerships with leading global brands.
With 15 modern machining systems and optimized assembly lines, our team of experienced workers ensures highly efficient production runs.
We offer 20 distinct series and over 500 varieties, supplying both standard and non-standard customized products for global projects.
We monitor every phase of production, from raw materials to final pressure tests, ensuring that only zero-defect products leave our facility.
By managing key manufacturing steps in-house, we control costs effectively and offer competitive pricing to our global distributors.
Our professional technical team provides end-to-end sales support, offering prompt quotes and post-delivery assistance.
Our high-performance industrial valves are trusted in municipal infrastructure projects, chemical processing plants, and long-distance gas transmission systems globally.
KR supplied various high-pressure water control valves designed to withstand harsh mountain environments and rapid flow rates.
Supplied large-size butterfly valves and heavy-duty check valves for municipal water distribution networks, meeting all European regulatory standards.
Supplied high-performance butterfly valves and robust gate valves engineered to handle abrasive slurries and complex industrial sludge.
Delivered corrosion-resistant valves designed to operate reliably under extreme chemical exposure and elevated processing temperatures.
Supplied heavy-duty ball valves and gate valves rated for low-temperature environments, ensuring safety across gas transmission pipelines.
Delivered a suite of water control valves to support municipal sewage management systems and urban water treatment facilities.
A walkthrough of our pressure-testing protocols for large-bore butterfly and check valves.
Highlights of our 15-station machining facility processing raw forgings into finished components.
Fully welded ball valves eliminate all body flange joints and bolts, removing potential leakage paths. This makes them ideal for high-pressure gas lines and district heating networks, particularly in underground installations where maintenance access is limited.
We select forged materials based on the application. For standard pipeline service, we use ASTM A105 or P355GH. For cold-weather environments, we specify ASTM A350 LF2 to ensure high impact toughness down to -46°C.
Yes. Their fully welded, leak-free design makes them suitable for direct burial. We can supply customized stem extensions and corrosion-resistant polyurethane coatings to support underground layouts without requiring valve chambers.
We offer soft seats (PTFE+C, Devlon, or PEEK) for tight shutoff at standard temperatures, and metal-to-metal seats for high-temperature steam or abrasive service. Seats can also be configured with Single Piston Effect (SPE) or Double Piston Effect (DPE) sealing systems.
Our valve designs are tested and certified to API 607 and API 6FA. In the event of a fire, the primary soft seal degrades, allowing the ball to shift and make contact with a secondary metal seat to control internal leakage.
We implement a strict quality program starting with raw material chemical analyses. Every finished valve undergoes hydrostatic and pneumatic pressure testing to check for zero leakage, and we issue full EN 10204 3.1 material test certificates for all orders.
Working with an established Chinese valve manufacturer like KR Valve Group provides significant advantages for global buyers, including raw material access, advanced engineering capabilities, and efficient logistics. China's complete industrial ecosystem allows us to source high-grade steel forgings, precision actuation systems, and custom seals quickly and cost-effectively.
We combine this supply chain strength with strict quality management systems. Our factory coordinates all phases of manufacturing in-house, including machining, assembly, welding, testing, and coating. This integrated structure ensures consistent quality, shortens production lead times, and allows us to offer competitive pricing without compromising on product performance.
Direct access to raw steel suppliers and specialized casting facilities keeps material costs competitive and supply lines stable.
Our design team can modify face-to-face dimensions, connection types, and stem lengths to match specific project requirements.
Located near major Chinese maritime ports, we offer flexible shipping options, export document preparation, and customs support.
Contact us today to receive a competitive technical quote, request specific material samples, or coordinate customized engineering designs for your project.
An enterprise specializing in the design and manufacture of valves.
KR VAVLE
Butterfly Valves
Gate Valves
Check Valves
Y Type Strainers
Water Control Valves