Explore our industrial range of precision-manufactured strainers, butterfly valves, and control systems designed to meet global processing plant benchmarks.
Understanding mechanical specifications, seal integrity, and alignment protocols in critical pipelines.
In high-pressure municipal and industrial fluid pipelines, selecting the correct valve design is crucial. A Custom Lug Type Butterfly Valve features threaded metal inserts (lugs) around the valve body, aligning perfectly with bolt holes on adjacent pipe flanges. Unlike wafer designs that sandwich the valve between two flanges, lug valves enable independent downstream line disconnection while maintaining upstream pressure. This makes them ideal for dead-end service where systems require downstream maintenance without shutting down the entire loop.
These customized valves are designed for bidirectional zero-leakage performance under extreme working pressures (from PN6 to PN25). By engineering the disc geometry and seat compression, manufacturers optimize flow coefficients (Cv) while reducing operating torque. For critical services, heavy-duty materials like Ductile Iron GGG40/GGG50, ASTM A216 WCB Cast Carbon Steel, and ASTM A351 CF8/CF8M Stainless Steel are selected to withstand high temperature and corrosive media.
Engineered to handle pressure differentials from either direction, ensuring drop-tight sealing in dual-flow process systems.
Allows downstream piping extraction without system depressurization. The lugs carry full structural pipeline pressure loads.
Designed with ISO 5211 mounting pads, allowing direct mating with pneumatic, electric, or gear operators.
KR has more than 20 years of experience in producing standard and non-standard valves of various types. We supply a wide selection of over 500 valve products, including butterfly valves, gate valves, check valves, water control valves, as well as all their matching and accessory products. These products have applications in various industries such as water treatment, dam construction, commercial buildings, energy and heating, chemical engineering, etc. We have won high repeat purchase rates from customers with excellent product variety and quality.
Beyond product excellence, we are dedicated to creating a mutually beneficial partnership with every customer. We believe that reliable service is as crucial as superior products, and we strive to continuously optimize the customer experience to achieve long-term win-win cooperation. Today, KR VALVE’s products have been exported to over 50 countries and regions in Europe, Asia, Africa, and Oceania, providing project construction and brand marketing services to thousands of customers.
Our ISO-certified workflows guarantee precision, reliability, and traceabilty for every custom valve order.
Our R&D department ensures product design and continuous innovation. Technicians design and develop products meeting customer and market requirements. Our lab provides modern testing capabilities to elevate performance. We offer 20 series and over 500 varieties.
Our production department formulates plans to ensure timely delivery. Products are manufactured under strict supervision in accordance with the ISO-9001 quality management system, utilizing over 30 sets of advanced machinery with monthly inventory updates.
Our inspection department ensures 100% quality. Zero leakage is our operating principle. According to international quality inspection standards, we conduct appearance, dimensional, and pressure tests, issuing compliant reports for all shipments.
Leveraging direct access to advanced casting foundries and automated production hubs.
Procuring custom industrial valves requires a balance of cost-efficiency, metallurgical quality, and strict compliance with standards like API 609, ASME B16.34, and EN 593. As a Chinese valve supplier, KR utilizes integrated regional manufacturing clusters to lower raw material and machining costs. Direct partnerships with foundries allow us to source high-grade ductile iron and stainless steel with certified mechanical properties (such as tensile strength, elongation, and impact values).
Additionally, our factory uses advanced CNC machining centers to ensure precise tolerances on critical components, like the valve stem, seat groove, and disc edges. By automating machining, we reduce dimensional variations that lead to premature seal wear. This structural optimization ensures our customized valves deliver low operating torque, reducing wear on electric and pneumatic actuators.
Our engineers design custom flanges matching ANSI Class 150/300, EN 1092-2 PN10/PN16/PN25, and JIS 10K specifications.
Every casting run undergoes spectrographic testing to verify chemical composition, with EN 10204 3.1 certification provided.
Located near major shipping ports, we streamline export processes to Europe, Southeast Asia, South America, and Africa.
Why engineering companies and global distributors choose KR Valve Group as their long-term supply partner.
We have our own independent brand 'KR' and also provide custom OEM services. We have established long-term manufacturing agreements with many famous global valve brands.
We operate 15 precision machining centers and modern assembly lines, staffed by experienced technicians specializing in high-tolerance valve setups.
We supply 20 series and over 500 varieties of standard-compliant and non-standard customized valve assemblies, fitting international project parameters.
We control the production of each internal component, from stem to disc, ensuring high compatibility during assembly and zero leakage.
By managing the core casting and machining processes in-house, we eliminate intermediate markups and optimize production costs.
We provide professional consulting services, structural design optimization, parameter calculation, and installation advice for all standard products.
Watch our factory videos to see our raw material handling, machining, testing, and shipping workflows.
Our standard and customized valves are deployed in infrastructure projects across more than 50 countries.
KR supplied water control valves to support flow regulation and pressure relief under varying hydrostatic loads.
We supplied large-diameter butterfly and check valves to optimize municipal drinking water systems.
KR butterfly valves and gate valves assist in handling high-viscosity sludge media in municipal wastewater setups.
Our corrosion-resistant CF8M valves provide durable containment for low-concentration acids and solvents.
We supplied steel ball valves and gate valves designed to maintain metal-to-metal seat integrity in cold climates.
KR water control valves regulate high-volume industrial and domestic wastewater processing circuits.
A comprehensive overview of our standard engineering lines, built to meet global industrial piping benchmarks.
Analysis of zero-emission seals, smart actuation, and specialized materials in modern pipelines.
Modern industrial plants require reliable flow control to prevent environmental leaks and process downtime. Today's key design trends focus on zero-fugitive emission packing and soft seats that retain tightness over thousands of thermal cycles. Lug butterfly valves with PTFE and elastomer seats are widely used in chemical processing, municipal wastewater handling, HVAC chillers, and desalination systems.
In addition, plants increasingly utilize integrated smart diagnostic tools. Equipping valves with positioners and torque transmitters allows operators to monitor wear on critical components like seats and bearings in real time. Our engineering team assists global buyers by analyzing custom parameters such as flow rates, fluid velocity limits, and chemical compatibility. This helps select the appropriate trim configurations, avoiding issues like cavity wear or cavitation in high-flow pipelines.
Expert engineering answers to common installation, maintenance, and specification questions.
A Wafer butterfly valve is clamped between two flanges using long, continuous bolts that span the entire width of the valve. If you remove downstream piping, the wafer valve loses its clamping force and cannot remain pressurized. In contrast, a Lug butterfly valve features independent threaded bolt lugs around its body. This allows you to bolt the valve directly to each flange from both sides. Consequently, you can remove downstream piping for maintenance while the valve remains fully pressurized in dead-end service.
Our valves are designed in accordance with API 609 (design parameters, face-to-face dimensions, and pressure-temperature ratings), ASME B16.34 (pressure boundaries and material wall thicknesses), and EN 593. Production testing complies with API 598 or ISO 5208, checking shell pressure and bubble-tight shutoff.
For water, air, and neutral sludges, EPDM or NBR seats are standard, offering reliable performance up to 120°C. For corrosive media, acids, and chemical processes, PTFE or RTFE seats are recommended. In applications exceeding 200°C, a metal-to-metal triple offset design is preferred to maintain seal integrity under severe thermal loads.
Every material batch undergoes spectrographic analysis before casting to verify element ratios (such as nickel, chromium, and carbon Content). Completed castings are inspected for porosity and wall thickness using ultrasonic and radiographic testing.
Contact KR Valve Group today. Our engineers will assist with custom parameters, CAD designs, and quotes for your next project.
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