Browse our top-tier manufacturing line including high-pressure gate valves, pneumatic control systems, heavy-duty check valves, and our proprietary air exhaust solutions.
In modern municipal fluid networks, thermal heating systems, industrial chemical processing, and desalination installations, the presence of entrapped air poses a severe threat to operational efficiency, structural integrity, and pipeline safety. As a leading wholesale automatic exhaust valve manufacturer, KR Valve Group has dedicated over two decades of engineering expertise to the design, research, and fabrication of advanced kinetic, automatic, and composite air release valves.
Air enters pressurized piping networks through several distinct mechanisms. Firstly, before startup, pipelines are filled with atmospheric air that must be completely displaced as water is introduced. Secondly, during operation, raw water carries roughly 2% of dissolved air by volume under normal atmospheric pressure. When pressure drops or temperatures rise, this dissolved air transitions out of solution, coalescing into pocket formations at high elevations along the pipeline path. Lastly, transient vacuum scenarios—induced by sudden pump failures, rapid valve closures, or pipeline breaches—allow external atmospheric air to ingress if vacuum protection systems are absent.
Our composite and automatic exhaust valves leverage a triple-function operation to mitigate these phenomena:
China's manufacturing landscape for industrial valves has transitioned from standard casting shops to high-technology, CNC-driven smart factories. As a key manufacturing hub, KR Valve Group leverages localized raw materials and cutting-edge industrial casting techniques to deliver unmatched engineering quality at highly competitive price points.
Utilizing automatic sand casting and precision shell molding lines ensures casting integrity without inner voids. Our workshop features 15 state-of-the-art horizontal machining centers, ensuring micrometer-level tolerance control on all critical sealing zones and seat contacts.
We target zero leakage across our entire range. Operating in complete alignment with ISO 9001 and API standards, each automatic exhaust valve undergoes individual high/low pressure seat testing, shell hydrostatic validation, and precision float buoyancy calibration.
Direct vertical integration within the local raw material supply chain ensures prompt access to high-grade GGG40 ductile iron, CF8/CF8M stainless steel, and specialty seals like EPDM/Viton. We provide OEM/ODM customizations for sizing (DN25 to DN300+) and connection standards (ANSI, BS, DIN, JIS).
Our engineering team relies on computational fluid dynamics (CFD) simulation tools to model airflow characteristics through exhaust ports during design, allowing us to prevent premature shutoff.
Our in-house R&D department coordinates continuous innovation. Our lab provides extensive modern testing capabilities to elevate product performance. We design automatic air valves using advanced aerodynamic modeling to ensure that air discharges effectively even under sonic flow velocities, avoiding premature closing issues standard in poorly designed float assemblies.
Products are manufactured under strict supervision in accordance with the ISO-9001 quality management system. We keep over 30 sets of advanced production equipment and update our inventory monthly to meet and exceed customer expectations for delivery. All components, including the stainless steel 304 floats, guides, and EPDM seals, are processed in-house.
Zero leakage is our fundamental design and manufacturing principle. According to international quality standards, we conduct a series of detailed inspections on appearance, dimensions, high and low-pressure tightness, and body strength, issuing fully certified compliance reports with each order.
To ensure optimal performance, automatic air valves must be tailored to the specific parameters of their target industrial environments. Below is an overview of key application categories for our high-capacity air valve line.
Long-distance pipelines spanning rolling terrains are highly susceptible to air accumulation. Air pockets collect at peak locations, reducing effective piping cross-sections and increasing energy requirements for pumps. Installing double-orifice automatic exhaust valves at all major summits ensures continuous air release, reducing pump workloads and preventing system surge pressure spikes.
Sewage piping systems carry solid wastes, grease, and biological components that generate toxic or explosive gases (like hydrogen sulfide and methane). Standard exhaust valves easily clog in these environments. Our specialty wastewater air valves feature a deep conical body that separates the liquid level from the sealing mechanism, preventing solids from contacting the plug and avoiding leakages.
Large-diameter water conduits and penstocks in dams process extreme water velocities. During system drainage, penstocks require massive volumes of air input to prevent damaging internal vacuums. Our high-capacity kinetic vacuum breakers provide rapid air intake to protect major civil engineering projects.
For pipelines processing salt water, demineralized water, or chemical solutions, standard carbon steel and iron valves face aggressive corrosion. We provide custom solutions built from CF8, CF8M, CF3M (316L) stainless steel, and PTFE-lined configurations to maintain high performance in harsh chemical settings.
Use the table below to select standard valve sizes, materials, and pressure ranges for your system. We also provide customized configurations for specialized projects.
| Model / Series | Nominal Sizes | Pressure Class | Body Material | Internal Float/Trim | Standards Compliance |
|---|---|---|---|---|---|
| KR-AEV-01 (Single Orifice) | DN15 - DN50 (1/2" - 2") | PN10 / PN16 / PN25 | Ductile Iron GGG40 / Brass | SS304 / EPDM Seat | DIN 3352 / BS EN 1074 |
| KR-AEV-02 (Double Orifice) | DN50 - DN300 (2" - 12") | PN10 / PN16 / PN25 / Class 150 | Ductile Iron GGG50 / Cast Steel | SS304 / SS316 / Viton | ASME B16.34 / EN 1092-2 |
| KR-AEV-03S (Sewage Air Valve) | DN50 - DN200 (2" - 8") | PN10 / PN16 | Ductile Iron GGG40 / CF8M | SS316 / NBR-bonded seat | AWWA C512 / ISO 7005 |
| KR-AEV-04C (Composite Stainless) | DN25 - DN250 (1" - 10") | PN16 / PN25 / PN40 | CF8 / CF8M / Duplex Steel | SS316L / EPDM | API 598 / EN 12266-1 |
At KR Valve, we believe in creating mutually beneficial partnerships. Providing comprehensive support is just as important to us as manufacturing quality products, and we continuously refine the customer experience to ensure a successful long-term partnership.
Our valves have been exported to over 50 countries, supporting vital municipal water systems, industrial operations, and energy projects.
KR supplied dynamic water control and non-clogging wastewater air valves for a municipal sludge treatment facility, improving wastewater throughput and preventing odor problems.
We designed and delivered DN300 water control valves and high-capacity air relief systems to Chile, managing high flow velocities under high pressure.
KR provided large-diameter double eccentric butterfly valves and air relief systems to regional water distribution grids, minimizing pressure losses and helping prevent air pocket formation.
Provided corrosion-resistant gate valves and composite air release valves to safely process abrasive sludge and gas-entrained industrial waste.
Delivered a full suite of duplex stainless steel CF8M check, gate, and automatic air valves to withstand harsh acids and chlorinated process streams.
Delivered high-strength cast steel ball and gate valves certified for gas transport applications in low-temperature ambient conditions.
See our manufacturing technology, automatic testing, and quality control systems in action.
Our extended product list features high-quality butterfly valves, Y-strainers, and pressure control solutions designed for demanding fluid systems.
KR VAVLE
