Explore our core engineering-grade product selections tailored for global municipal waterlines, energy networks, and process plants.
In closed-loop hydraulic pipelines and municipal distribution grids, trapped air is an insidious threat that compromises operational efficiency and structural integrity. Trapped air pockets restrict flow, increase energy consumption due to localized friction losses, and act as highly compressible cushions that intensify transient pressure surges (water hammer). To address this, two-port air valves (also known as double-chamber or dual-port air release valves) represent a vital engineering solution. Unlike single-port variants, two-port air valves provide two distinct venting functionalities within one consolidated valve assembly: kinetic high-capacity air exhaust/intake during system charging or draining, and automatic micro-bubble venting under pressurized operating conditions.
As a premier OEM two port air valve supplier and manufacturer, KR Valve designs these products with aerodynamic floating elements. When the pipeline is being filled, the primary kinetic port stays open to vent huge volumes of air. Once water enters the chamber, the buoyant float rises to seal the orifice. During normal pressurized operations, secondary automatic orifices vent pockets of air that continuously accumulate from temperature changes and pressure drops. When the system is drained, the float immediately drops, allowing rapid intake of atmospheric air to prevent catastrophic vacuum collapses within the pipe network.
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.
Rapid urbanization and industrial expansion have triggered a surge in global demand for intelligent water infrastructure. In Europe, municipal utility operators are prioritizing water loss mitigation and energy performance, driving the retrofit of older networks with advanced aerators. In North America and the Middle East, large-scale desalination projects, regional transmission lines, and high-pressure transmission networks require robust two-port air valves that can handle high pressure ratings (PN16, PN25) and corrosive media.
Industrial procurement managers look for manufacturers that can supply customized designs, such as high-temperature seals or anti-slam devices, under one roof. Purchasing directly from a dedicated manufacturer like KR Valve ensures that design modifications—such as custom flanging standards (EN, ANSI, BS) or unique paint specifications—can be engineered to order. Crucially, industrial buyers want to bypass middlemen to guarantee technical accountability, material traceability, and reliable lead times.
Protects pipeline infrastructure from negative pressures during power failures and sudden pump shutdowns.
Utilizes corrosion-resistant alloys (SS316L, Duplex steel, PTFE linings) to resist aggressive chloride ions.
Ensures stable processing flow and prevents air locking in chemicals, paper mills, and mining slurry pipelines.
How KR Valve ensures absolute reliability, structural durability, and zero-leakage performance for municipal and industrial valve infrastructure.
Our dedicated R&D department drives continuous product innovation. Using modern simulation tools, our technicians design systems that meet strict customer and market requirements. Our test lab provides extensive modern testing capabilities to push performance limits. We now offer 20 series and over 500 valve varieties.
Our production department develops strict manufacturing schedules to ensure timely deliveries. All valves are built in accordance with ISO 9001 quality management guidelines. We utilize over 30 advanced production machines and update our inventory monthly to meet demanding customer schedules.
Our dedicated QA/QC department performs a rigorous series of inspections. Every single valve undergoes pressure testing for shell integrity and seat tightness before packing. Compliance reports are issued in line with international inspection standards to guarantee zero-defect and zero-leakage operations.
To survive high pressures and corrosive fluids, two-port air valves must use specialized materials. The housing is typically cast in GGG40 or GGG50 Ductile Iron. This material provides excellent tensile strength and impact resistance, allowing it to withstand water hammer surges better than traditional gray cast iron. Internally, the floats must remain lightweight yet strong. KR Valve uses precision-molded, high-density ABS, Polypropylene, or Stainless Steel (SS304/SS316) floats, ensuring stable operation even under rapid pressure changes.
The sealing arrangement is another critical element. Standard rubber components like NBR are perfect for general water pipelines, whereas EPDM seals offer ozone resistance, making them ideal for municipal drinking water systems. For highly aggressive chemicals, we offer PTFE (Teflon) coatings and Viton seals to prevent chemical breakdown and preserve seat integrity.
| Component | Standard Options | Premium OEM Configurations | Target Environment |
|---|---|---|---|
| Valve Body / Bonnet | Ductile Iron (GGG40 / GGG50) | Cast Steel WCB, CF8, CF8M | High-pressure pipelines, municipal grids |
| Internal Float Ball | ABS / Solid Polypropylene | Stainless Steel SS304 / SS316 | Corrosion resistance, high-speed venting |
| Resilient Seals | NBR / EPDM (Drinking Water) | Viton / Silicon / PTFE | Chemical plants, raw wastewater, high temp |
| Coating Specification | Epoxy Powder Coating (250 μm) | PTFE Lined, Thermal Spray Alloys | Soil contact, marine environments, acids |
Leveraging our technical infrastructure, manufacturing footprint, and service commitment to support your industrial projects.
We supply under our independent brand "KR" and provide reliable OEM contract manufacturing for renowned international valve brands.
Equipped with 15 advanced machining lines and assembly units staffed by highly experienced technicians.
Over 20 series and 500 models available, supporting standard international formats and non-standard custom projects.
We trace quality across every step, testing each sub-assembly to guarantee zero-leakage standards.
By controlling all casting, machining, and testing internally, we provide competitive factory-direct pricing.
We provide professional and complete pre-sales sizing calculations and after-sales maintenance support globally.
Two-port air valves are critical safety devices used in complex, high-stakes infrastructure projects. Their integration helps prevent transient pressure surges and vacuum-induced collapses that can result in expensive downtime.
KR Valve engineered high-pressure water control valves and kinetic air relief elements for a major dam construction project in Chile. The system required components that could withstand rapid elevation changes and heavy sediment loads. Our custom solutions ensured smooth air release, protecting the main turbine feed line from hydraulic shock.
For water treatment and supply works in Italy, KR supplied large-size double eccentric butterfly valves and dual-disc check valves to manage water distribution. Correctly sized air exhaust systems helped the client reduce friction losses, achieving a significant drop in pump energy consumption.
Standard air valves often fail in raw sewage applications due to solid waste accumulation. At a major sludge plant in Indonesia, KR Valve installed specialized check valves and butterfly valves designed with non-clog bodies, ensuring uninterrupted service in high-solids wastewater systems.
Watch our production lines in action to see how we machine, assemble, and inspect our heavy-duty industrial valves.
The industrial valve industry is moving toward greater automation and digitalization. Traditional mechanical air valves are being upgraded with smart diagnostic capabilities. By integrating pressure transducers and wireless communication modules directly into the air valve chamber, operators can monitor pipeline conditions and air venting frequencies in real time. This helps predict potential blockages or component fatigue before they lead to pipeline failure.
Additionally, environmental standards are reshaping material design. At KR Valve, we are transitioning to lead-free copper alloys and water-based, solvent-free epoxy coatings to comply with strict global safety regulations for drinking water (such as WRAS and NSF/ANSI 61).
Developing integrated electronic sensors that detect float positions, internal pressure shifts, and flow velocities, sending automated maintenance alerts directly to system operators.
Adopting premium fusion-bonded epoxy powders applied via electrostatic processes. This prevents heavy metals and VOCs from contaminating clean water systems.
We design and manufacture high-performance industrial valves tailored to modern process control and municipal distribution networks.
Read detailed technical answers to common questions about selecting, installing, and maintaining air release valves in water networks.
A single-port kinetic valve only vents or intakes air when filling or draining a pipeline. However, it cannot release accumulated air pockets while the system is operating under pressure. A two-port air valve combines a large kinetic port and a small automatic port, ensuring complete protection during both system startup and high-pressure operational cycles.
For aggressive industrial chemical lines or desalination plants, we recommend bodies cast in WCB, CF8, or CF8M stainless steel. These are paired with fluoropolymer linings (PTFE/FEP) and Viton seals to resist acidic corrosion and chemical breakdown.
When a pump shuts down suddenly, a vacuum can form in the pipeline, which may collapse the pipe. Our valves open instantly to draw in atmospheric air, acting as a cushion. As the column re-establishes, the valve slowly vents this air to prevent high-velocity water columns from slamming into each other.
To ensure effective air removal, valves should be installed at local high points, at long downward runs, at change-of-gradient points, and after pumps. We recommend installing them every 500 to 1000 meters along flat, continuous pipeline sections to prevent air pockets from forming.
We need to know the pipeline diameter, the maximum filling and draining flow rates, the design working pressure, and the maximum allowable vacuum pressure. Our engineering team uses this data to calculate the exact intake and exhaust capacities, helping you size the valve correctly.
Yes. All KR Valve products are manufactured under strict ISO 9001 quality management guidelines. Our designs comply with standards like DIN, BS, EN, ANSI, and ISO. We also provide test and compliance certification documents for every batch shipped.
We offer fully customizable pressure ratings, including PN10, PN16, PN25, and Class 150/300. Our technicians adjust the wall thickness of the casting, upgrade the bolt pattern, and choose suitable high-density floats to ensure reliable performance under your target test pressures.
We recommend visual inspections every 6 months to ensure the venting outlets are clean and free of debris. A full system check should be performed annually, which includes inspecting the seals, cleaning the float ball chamber, and replacing worn rubber components if necessary.
Explore our complete range of specialized industrial valves, designed to provide reliable flow control and system isolation for demanding pipeline applications.
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