As a trusted OEM factory, we manufacture standard-compliant, heavy-duty wafer-type non-return valves (NRV) engineered to eliminate fluid backflow and mitigate catastrophic water hammer in major waterworks, chemical plants, and pipeline projects globally.
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, and water control valves, as well as all their matching and accessory products.
These high-performance flow control mechanisms have applications in various industries such as water treatment, dam construction, commercial buildings, energy and heating, chemical engineering, and oil pipeline installations. We have won high repeat purchase rates from clients with excellent product variety and strict quality assurance protocols.
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.
We manage every segment of the supply chain internally—from engineering designs and physical casting to rigorous pressure validations. Below is how we translate raw materials into high-integrity industrial valves.
Our dedicated technical division continuously innovates to meet extreme temperature, high pressure, and highly corrosive application environments. With 20 independent product series, our laboratory utilizes modern mechanical and hydrodynamic simulation software to refine flow characteristics.
Operating under rigorous ISO-9001 quality management structures, our workshop is equipped with 15 advanced machining stations and automated assembly lines. Our monthly raw material and inventory management plans guarantee on-time delivery even for complex custom global orders.
Our inspection department executes a series of hydrostatic and pneumatic tests in compliance with API, EN, and DIN standards. We enforce a 100% zero-leakage threshold, issuing comprehensive inspection reports on structural dimensions, pressure ratings, and surface coating integrity.
A **Wafer Type Non-Return Valve (NRV)**, also known as a wafer check valve, is a crucial inline fluid safety component designed to allow medium flow in one direction while preventing reverse backflow. Unlike traditional swing check valves, wafer-type designs feature an ultra-compact, face-to-face body profile that installs between standard pipe flanges. This design dramatically minimizes physical footprint, reduces installation weight, and lowers shipping and structural support costs.
Our manufacturing facility produces dual-plate and single-plate wafer-style check valves. The Dual Plate Wafer Check Valve is widely preferred for high-volume pipelines. It features two semi-circular spring-loaded plates rotating around a central hinge pin. As forward flow commences, the plates open with minimal cracking pressure. When the flow stops, the torsion spring closes the plates quickly before reverse velocity develops, virtually eliminating water hammer.
The Single Plate Wafer Check Valve, with its robust, single-disc swinging configuration, provides simple and cost-efficient backflow prevention for low-velocity systems or applications carrying heavier slurries and industrial particulate matter.
Selecting appropriate metallurgy and elastomer materials is critical for maximizing the operating life of an NRV. KR Valve offers a versatile configuration matrix:
Our engineering division utilizes Computational Fluid Dynamics (CFD) to optimize internal valve geometries, ensuring minimal pressure drops across the valve disc. We calibrate the torsion spring tension to yield ideal cracking pressures—the exact threshold where the disc lifts to allow passage. Low cracking pressure minimizes energy consumption, which reduces pump operating costs.
Check valves are foundational to fluid safety across a variety of global industries. At KR Valve Group, we design complete, system-wide fluid control solutions that protect valuable equipment, such as pump systems, turbine units, and heat exchangers.
Large-scale desalination facilities and urban drinking water systems rely on dual-plate wafer check valves to handle high-flow velocities. By preventing backflow, our valves prevent pump reversal and protect multi-stage filtration membranes from pressure spikes.
Heating, ventilation, and air conditioning systems require low-noise, low-pressure drop check valves. Our spring-loaded non-return valves prevent thermo-siphoning and backflow in closed-loop commercial heating and cooling lines.
For harsh acids, alkalines, and chemical processing media, KR provides solid PTFE-lined butterfly and wafer-check systems. These valves offer superior corrosion resistance and prevent cross-contamination in chemical production lines.
Handling sludge, industrial slurry, and domestic effluent requires check valves with unobstructed flow paths. Our full-bore swing and rubber flap check valves prevent clogging and backflow in wastewater treatment plants worldwide.
We manufacture under our independent brand "KR" and provide comprehensive OEM/ODM services for many well-known global valve brands. We offer customized body castings, custom tag engraving, and tailored packaging to fit your brand identity.
Our factory features 15 precision machining centers, horizontal boring machines, and specialized testing fixtures. This hardware, operated by our experienced production team, ensures precise dimensional tolerances and high-quality surface finishes.
We offer 20 independent product series and over 500 valve variations. We supply standard configurations and customized valves designed to match unique face-to-face dimensions and non-standard flange drillings.
We control every production phase internally—from foundry castings to final packaging. This vertical integration allows us to maintain competitive pricing without sacrificing the material grade or performance of the valve.
Operating in international markets requires compliance with regional engineering standards and local regulatory frameworks. KR Valve designs and manufactures valves to comply with major international systems:
To support our distribution network, we offer localization assistance including multilingual technical drawings, 3D CAD files, and compliance documentation. Our rapid-response engineering team provides remote troubleshooting and on-site support to resolve critical pipeline installation challenges.
Industrial fluid systems are evolving toward higher efficiency and remote operation. KR Valve's product roadmap focuses on three main development areas:
Take a virtual tour of our factory floor. Watch our advanced CNC machines, automatic coating systems, and pressure testing rigs in action.
Our valves are installed in major public utilities, power generation plants, and chemical networks worldwide. Below are some of our successful project deliveries:
Supplied custom heavy-duty water control valves and safety check valves engineered for high static pressures and remote actuator operations.
Delivered large-diameter butterfly valves and non-return swing check valves to upgrade the primary drinking water distribution network.
Installed corrosion-resistant concentric butterfly valves and soft-sealed gate valves to manage high-viscosity municipal sludge processing.
Provided solid PTFE-lined corrosion-resistant valves and stainless steel dual-plate check valves for hazardous chemical processing pipelines.
Supplied high-pressure carbon steel gate valves and ball check valves optimized for low-temperature operating environments.
Shipped hydraulic control float valves and non-return valves to manage backflow prevention in urban stormwater runoff stations.
Wafer-type non-return valves are significantly lighter and more compact than conventional flanged swing check valves. A wafer check valve installs between pipe flanges, minimizing face-to-face dimensions and reducing both shipping costs and pipeline structural support requirements. Its spring-assisted, rapid-closing design also provides superior prevention against water hammer.
A dual-plate check valve uses two spring-loaded plates pivot-mounted on a central pin. When the flow stops, the internal torsion springs force the plates shut *before* the liquid column can reverse direction. Closing the valve prior to backflow prevents pressure waves from forming, protecting the system from water hammer.
Resilient elastomer seats (EPDM, NBR, Viton) provide bubble-tight, zero-leakage shutoff. They are ideal for water treatment, clean water systems, and low-temperature lines. Metal-to-metal seats (SS304, SS316, hard alloys) are required for steam, thermal oils, abrasive media, and high-temperature systems where elastomers would degrade.
Yes. Spring-loaded wafer non-return valves can be installed in vertical pipe runs with upward flow. For vertical lines with downward flow, standard check valves are not recommended as gravity will prevent the plates from functioning correctly. For vertical installations, ensure the valve is designed with spring assistance to guarantee proper operation.
Our standard dual-plate check valves are engineered for low cracking pressures, typically between 0.05 bar and 0.15 bar (depending on valve size). We can also adjust the spring tension to meet specific cracking pressure requirements for low-pressure gravity systems or high-pressure bypass lines.
Our OEM services include customized valve body casting with your company's logo, custom paint schemes, custom elastomer compositions (such as EPDM, NBR, or Viton), specific flange drillings (ANSI, DIN, EN, JIS), and custom packaging designed to align with your brand standards.
We offer a complete range of check, gate, butterfly, and specialized water control valves. View the specifications for our industrial-grade components below.
KR VAVLE