We have combined a float-type automatic air vent and an independently controllable drainage ball valve into a single unit. During daily operation, it continuously and automatically expels accumulated air to eliminate airlocks and associated noise; during maintenance, the drainage valve can be opened separately to flush out sediment and scale from the piping.
Equipped with high-temperature resistant EPDM gaskets, Integrated Rear Brass Air Vent Drain Control Valve is designed to withstand the long-term high-temperature water circulation typical of underfloor heating systems. The valve body features a polished nickel-plated finish that resists scale and oxidation, while the compact, integrated structure significantly saves installation space within the manifold cabinet—making it suitable for everything from small residential units to commercial shops and office buildings.
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Product Specifications |
L |
d1 |
d2 |
d3 |
Pipe Thread |
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|
DN |
Size |
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|
25 |
32mm-1"M |
153.5 |
26 |
12.7 |
G3/8"F |
G/PT/NPT |
During the long-term use of hydronic underfloor heating systems, two major issues often accumulate at the end of the manifold, compromising heating performance: air trapped in the circulation loop creates airlocks, causing noisy water flow and cold spots in certain rooms; meanwhile, sediment and scale settle over time, clogging the heating coils and reducing heat exchange efficiency.
Traditional solutions require installing separate air vent valves and drainage ball valves, which consume significant cabinet space, increase the risk of leaks due to multiple threaded connections, and make installation or replacement cumbersome. Our Integrated Rear Brass Air Vent Drain Control Valve is a 2-in-1 component designed specifically for the end of underfloor heating manifolds. It is forged from thickened, high-quality HPb59 brass and features standard 1-inch threading, allowing it to directly replace the end caps on the vast majority of manifolds on the market without requiring modifications to pre-installed piping.
The integrated rear brass air vent and drain control valve combines an automatic air vent and a drain ball valve into a single unit. This eliminates the need for separate air vents and drain plugs, reduces the number of threaded connection points, and fundamentally lowers the risk of water or air leaks at joints caused by the high-temperature circulation typical of underfloor heating systems.
The valve end features industry-standard 1-inch threading, making it compatible with the end-cap specifications of mainstream underfloor heating manifolds. Installation involves simply removing the existing plug—no cutting or modification of embedded piping is required—significantly shortening the installation time.
Its streamlined, integrated design occupies half the space of separate components. It is ideal for space-constrained installations—such as small heating cabinets in compact homes or equipment utility spaces—ensuring a neat and organized piping layout.
Manufactured via hot forging from HPb59 brass (a grade specialized for underfloor heating), the valve features thickened walls and a dense, pore-free structure. It stably withstands system circulation pressure and resists bulging, cracking, or leaking, even under long-term thermal cycling.
The valve exterior undergoes a dual-protection process—polishing followed by nickel plating—which isolates the brass base material from minerals and moisture in the heating water. This prevents limescale buildup and oxidation spots during long-term operation, maintaining a clean appearance and extending the valve's service life.
Raw brass materials undergo batch-by-batch spectral analysis to ensure lead content complies with regulations and prevents heavy metal leaching. Suitable for both domestic hot water and underfloor heating circuits, it meets environmental compliance standards for residential HVAC piping materials.
1. Features a built-in, highly responsive float mechanism that automatically releases air generated during the underfloor heating water circulation process, eliminating the need for frequent manual venting;
2. Continuously vents accumulated air to prevent airlocks and eliminate noise caused by water flow turbulence; ensures uniform water circulation throughout the system, preventing low temperatures in specific rooms;
3. The venting assembly is independently sealed; the float operates reliably even with high-temperature water circulation, avoiding issues such as jamming, air leaks, or mechanical failure.
1. Equipped with a dedicated control handle; it remains fully sealed during normal heating operation and is opened only for system flushing and maintenance;
2. Allows for hose connection when opened; utilizes system water pressure to rapidly flush out sediment and scale accumulated at the bottom of the heating coils, preventing blockages and heat transfer inefficiency;
3. The drain valve features a thickened PTFE internal seal that maintains an airtight, zero-leakage performance even after repeated opening and closing, eliminating long-term seepage risks.
Uses specialized high-temperature resistant EPDM gaskets that undergo thousands of factory-conducted high/low-temperature aging cycles; they do not harden, shrink, or crack during long-term exposure to hot water (above 60°C), ensuring a durable, tight seal at threaded connections and valve seats.
Independent gaskets are installed at three critical points—the air vent core, the drain ball valve, and the valve body threads—creating a layered sealing system; this prevents immediate leaks or seepage caused by the failure of a single seal, thereby enhancing the operational stability of the underfloor heating system.
The EPDM gaskets and air vent float cores are genuine, independently replaceable parts; should a seal age or fail, only the specific component needs to be purchased and replaced, significantly reducing long-term maintenance and consumable costs for the heating system.
Every batch of HPb59 brass billets undergoes spectroscopic and physicochemical testing to strictly control parameters regarding lead content, compressive strength, and dezincification resistance. Venting floats and EPDM gaskets undergo specialized high-temperature cycling and hydrostatic durability tests to preemptively eliminate components prone to aging or insufficient pressure resistance.
Every Integrated Rear Brass Air Vent Drain Control Valve undergoes hydrostatic pressure testing, bubble-based airtightness leak testing, and durability testing involving tens of thousands of opening/closing cycles. These tests comprehensively verify the valve body's pressure limits, sealing stability, and the responsiveness of venting and draining functions.
Specialized checks are performed on the coaxiality of the 1-inch installation threads, the sensitivity of the venting float, and the sealing tightness of the drain ball valve. This precision ensures the avoidance of three common underfloor heating system failures: thread misalignment, venting mechanism jamming, and leakage at the drain port.
Each Integrated Brass Air Vent & Drain Control Valve is laser-engraved with a unique batch code, and records covering all production stages—forging, machining, component assembly, and final inspection—are permanently archived. Upon shipment, we provide spectroscopic analysis reports for the brass material and factory certificates of conformity for hydrostatic and airtight performance, meeting requirements for residential underfloor heating inspections and commercial HVAC project completion filings.
Professional technicians provide one-on-one guidance on thread assembly standards, float adjustment, drain line flushing procedures, and troubleshooting protocols for leaks, thereby reducing rework time during on-site installation and commissioning.
Our multilingual online support team accommodates time zones worldwide, ensuring rapid responses to inquiries regarding product selection, bulk order status, and after-sales issues from overseas HVAC wholesalers and underfloor heating contractors, facilitating seamless cross-border communication.
For bulk procurement projects—such as residential underfloor heating installations or commercial heating systems for shops and office buildings—we provide customized, standardized configuration plans based on manifold specifications and cabinet layout requirements, optimizing the inventory list for the entire piping accessory set.
We ensure a long-term, continuous supply of individual wear-and-tear parts, such as genuine EPDM gaskets and air-venting float valve cores. The entire range of integrated air-venting and drainage valves comes with a 12-month manufacturer's warranty covering inherent material and workmanship defects—including brass valve body cracking, leaks due to factory assembly issues, and jamming of air-venting or drainage components—with free technical guidance and genuine replacement parts provided.
Suitable for replacing manifold terminals in commercial housing and self-built homes; the integrated structure fits compact residential heating cabinets. Automatic air venting eliminates noise in the heating system, and simple periodic drainage maintenance meets the long-term usage needs of ordinary households.
Ideal for commercial environments with high foot traffic and water containing impurities; the drainage ball valve allows for quick, periodic flushing of sediment, reducing the risk of coil blockages. The compact valve body saves space in tight utility closets, making Integrated Rear Brass Air Vent Drain Control Valve suitable for standardized, large-scale commercial HVAC installations.
Suitable for multi-story office buildings requiring numerous centralized manifolds; the "two-in-one" integrated valve reduces the variety of parts to be procured and simplifies bulk assembly processes. The product line comes with full documentation for project acceptance, meeting the standards for large-scale HVAC project bidding and completion filing audits.
The separate air-venting and drain fittings at the ends of existing manifolds often suffer from aging and leakage. Instead of replacing the entire manifold, the old end cap can simply be removed and replaced with this integrated valve. This requires no modification to the embedded underfloor heating piping, resulting in easier renovation, a shorter project timeline, and significantly reduced costs for materials and labor.
A: Traditional separate fittings require the installation of an independent air vent and a drain plug; these two components take up significant space in the manifold cabinet, double the risk of leakage due to having two threaded connections, and involve complex on-site assembly and higher labor costs. This product integrates air-venting and draining functions into a single valve body with only one threaded connection, drastically reducing leakage risks. Its compact, all-in-one structure fits into tight manifold cabinets and replaces the original end cap directly without piping modifications. It simplifies inventory management and shortens on-site installation time, making it an ideal choice for cost reduction and efficiency improvement in both new installations and renovation projects.
A: No. The air vent features a high-precision internal float mechanism that has passed factory durability tests involving tens of thousands of high- and low-temperature cycles. The float rises and falls flexibly to vent air automatically whenever air accumulates in the circulating water. It is equipped with a high-temperature-resistant EPDM seal that prevents the float from sticking, even after prolonged immersion in hot water, ensuring sensitive air venting throughout the heating season without jamming or leakage.
A: It is fully compatible. The installation end features a standard 1-inch male thread common in the underfloor heating industry, fitting the end-cap specifications of most domestic and imported manifolds used in residential and commercial applications. It allows for direct replacement in both new installations and renovation projects without the need for additional reducing adapters.
A: No, it won't. It comes with an industrial-grade EPDM gasket specifically designed for underfloor heating systems. This gasket has independently passed long-term aging tests involving immersion in high-temperature static water; it reliably withstands continuous circulation of hot water exceeding 60°C and resists hardening, shrinking, or cracking during thermal cycling. It ensures a tight seal throughout the entire heating season, eliminating the risk of slow leakage at connection points.
A: No, it won't. Compared to separate venting and draining components, the integrated valve structure reduces the overall volume by nearly half. The Integrated Rear Brass Air Vent Drain Control Valve body can be fully enclosed by the underfloor heating system's insulation, with only the drain handle slightly exposed. The handle can be easily rotated to perform draining operations within the standard space reserved in the cabinet; there are no obstructions from sheet metal or insulation layers, making operation convenient and effortless.
Address
Bingang Industrial Park, Ganjiang Town, Yuhuan City, Zhejiang Province, China
