Extended Double Female Thread Brass Ball Valve with Union

Our Extended Double Female Thread Brass Ball Valve with Union is specifically designed to solve challenges related to installation in tight spaces and future maintenance. It is forged from a single piece of lead-free, dezincification-resistant brass and features extended female threads at both ends, making it a perfect fit for restricted spaces with limited clearance. The inclusion of detachable unions at both ends allows for maintenance and disassembly without cutting the pipe.

Equipped with a mirror-finish chrome-plated sealing ball, thickened PTFE gaskets, and a blow-out-proof stem design, the valve ensures full-bore flow with minimal pressure loss and zero-leakage bidirectional sealing, while withstanding pressure fluctuations caused by thermal cycling. Each product undergoes comprehensive quality inspections specific to plumbing valves, ensuring compliance with standards for thread precision and union fit. Available in a full range of sizes, it is the ideal choice for tight-clearance HVAC piping requiring long-term reliability and low maintenance.

Technical parameters

Extended Double Female Thread Structure

1. Extended threads compensate for installation clearance limitations: Compared to standard short-thread valves, this model features extended female threads at both ends to ensure sufficient thread engagement length. It allows for full thread engagement in compact spaces—such as the tight interiors of wall-hung boilers and air-source heat pump units, or narrow recesses for in-wall piping—thereby eliminating sealing failures or leaks caused by inadequate thread engagement.

2. Precision CNC threading for universal compatibility: The threads are produced using high-precision turning processes, resulting in uniform profiles and standardized tolerances. This ensures seamless compatibility with standard male-threaded fittings and copper pipe connectors available on the market, eliminating the need for custom adapters and greatly enhancing piping connection versatility.

3. Symmetrical Double-Female Thread Design for Bi-directional Piping: Features extended female threads on both ends with no installation orientation restrictions; allows for seamless connection regardless of flow direction. This simplifies on-site installation and accommodates complex, tight piping layouts.

Detachable Double-Union Structure

1. Non-destructive Disassembly without Cutting: Designed with independent union nuts at both ends, the valve body can be removed simply by loosening the unions for cleaning, seal replacement, or maintenance. There is no need to cut or replace existing copper piping, thereby reducing material waste and labor time.

2. Precision-Engineered Union Fit: Union engagement clearances are factory-calibrated for a perfect fit. The connection remains tight and secure even after repeated disassembly and reassembly, preventing issues such as loosening, leakage, or stripped threads.

3. Modular Structure for Independent Part Replacement: Union nuts and sealing gaskets are independently replaceable. Only the specific worn-out part needs to be swapped—eliminating the need to replace the entire valve—which significantly lowers consumable procurement costs for long-term, large-scale maintenance operations.

Forged, Thick-Walled Brass Valve Body

1. Lead-Free, Dezincification-Resistant, One-Piece Forged Construction: Manufactured via one-piece forging from high-quality lead-free brass, the valve body features a dense, uniform structure free from porosity or pinholes. Extended Double Female Thread Brass Ball Valve with Union offers excellent resistance to dezincification and oxidation; it does not leach heavy metals during long-term water flow, meeting safety standards for residential drinking water.

2. Thickened Walls for Pressure Resistance, Scale Prevention, and Durability: The valve body walls are thickened throughout to provide superior pressure resistance, stably withstanding the thermal and pressure fluctuations found in underfloor heating and air-source heat pump systems. The smooth interior prevents the accumulation of scale and debris, reducing the risk of pipeline blockages.

3. Seamless One-Piece Design Eliminates Corrosion Risks: The one-piece forged construction eliminates seams, avoiding the corrosion and leakage vulnerabilities associated with segmented welding or assembled valve bodies. It is ideally suited for the continuous, year-round circulation demands of residential and commercial HVAC piping systems.

Sealing and Flow System

1. Mirror-finish chrome-plated ball + thickened PTFE seal; bidirectional airtightness and leak prevention: The valve core undergoes high-precision mirror-finish chrome grinding, resulting in a wear-resistant and anti-fouling surface. Paired with a thickened, reinforced PTFE gasket, it achieves bubble-tight, zero-leakage performance for both forward and reverse flow, maintaining seal integrity without hardening or failing under fluctuating hot and cold temperatures.

2. Full-bore straight-through flow path; low pressure loss and efficient water delivery: The interior features no diameter reduction or flow-restricting protrusions, ensuring smooth water passage. This effectively minimizes pipeline pressure loss, prevents issues such as uneven underfloor heating or insufficient flow in air-source heat pump water cycles, and enhances overall water delivery efficiency.

3. Blow-out-proof stem with back-sealing design; enhanced operational stability: Features a built-in back-sealing, blow-out-proof stem that absorbs instantaneous high-pressure spikes and fluctuations. This eliminates the risk of stem ejection or media leakage, significantly improving the safety of hot/cold circulation piping systems.

Ergonomic Control Design

1. Extended handle for smooth 90° operation; effortless control: The extended-lever handle design allows for full opening and closing with just a gentle 90° turn. Operation is smooth and snag-free, reducing the physical effort required for daily flow control.

2. Clearly distinguishable on/off status; reduced operational errors: The switching range is clearly defined, allowing for quick status identification whether the valve is concealed in a ceiling, enclosed in an equipment cabinet, or surface-mounted. This prevents errors that could lead to supply interruptions or leaks.

3. Compact structure suitable for various spatial layouts: The Extended Double Female Thread Brass Ball Valve with Union features a streamlined, compact design suitable for underfloor heating manifolds, tight equipment gaps, and confined spaces in kitchens or bathrooms. It minimizes space usage within the piping layout, making it ideal for diverse home renovation and small-scale HVAC installation scenarios.

Standardized End-to-End Quality Control

1. Spectroscopic raw material analysis; strict adherence to lead-free environmental standards: Every batch of brass raw material undergoes spectroscopic composition analysis. Key metrics—such as lead content, dezincification resistance, and corrosion resistance—are strictly controlled to ensure the safety and regulatory compliance of water supply materials right from the source.

2. 100% Comprehensive Performance Testing: Finished products undergo sequential testing—including hydrostatic pressure resistance, airtightness/leak detection, and 10,000-cycle durability tests—to fully verify three core performance metrics (pressure bearing, sealing, and wear resistance) and eliminate defective units.

3. Specialized Structural Verification: Key inspections focus on the precision of the extended double-ended female threads, thread coaxiality, and the fit/clearance of the union connection; this targets and prevents specific issues such as stripped threads, loose unions, and interface leakage.

4. Full-Batch Traceability & Compliance Certification: Each product bears a unique batch code, ensuring traceability across the entire production process. Material test reports and CE certification are available, fully meeting requirements for home renovation, HVAC project acceptance, overseas customs clearance, and bidding.

Comprehensive After-Sales Service

1. One-Stop Installation & Commissioning Support: Professional technicians provide end-to-end guidance on piping connections, thread assembly, hydrostatic pressure testing, and leak troubleshooting, solving installation challenges in tight spaces and reducing on-site rework rates.

2. Customized Solutions for Bulk Projects: Tailored piping selection and matching solutions are available for bulk home renovation procurement, air-source heat pump integration, and large-scale underfloor heating projects, ensuring standardized implementation across diverse operating conditions.

3. Long-Term Warranty & OEM Parts Supply: The Extended Double Female Thread Brass Ball Valve with Union comes with a 12-month manufacturer's warranty. We ensure a stable, long-term supply of OEM replacement parts—such as PTFE gaskets, handles, and union nuts—to resolve consumable shortages during long-term project maintenance.

Suitable for Which Specific HVAC Piping Applications?

1. Residential Whole-House Hot & Cold Water Piping: Suitable for concealed piping in kitchens and bathrooms as well as main-to-branch distribution lines; the extended female thread accommodates narrow-spacing embedded pipes, while the union structure facilitates future filter replacement and pipeline maintenance.

2. Individual Household Underfloor Heating Circulation Systems: Designed specifically for the confined spaces of underfloor heating manifold cabinets; the bidirectional flow design ensures no loss of heating flow rate, and the non-destructive disassembly structure supports periodic flushing and maintenance of underfloor heating pipes.

3. Air-source heat pump heating/cooling circulation piping: Designed for the inlet and outlet water circuits of air-source heat pump units; withstands long-term thermal cycling; ensures a stable, leak-proof seal; and fits the compact internal layout of the equipment.

4. Wall-mounted boiler piping: Optimized for the tight installation clearances of wall-mounted boilers; features dual extended female-threaded connectors that fit equipment ports perfectly without encroaching on internal space, allowing for maintenance without disconnecting the main unit piping.

FAQ

Q1: Is the lead-free forged brass valve body suitable for residential direct-drinking water lines?

A: Yes, it is perfectly suitable. The valve body is made of lead-free, dezincification-resistant brass (verified by spectral analysis); it prevents heavy metal leaching, is hygienic and eco-friendly, meets standards for residential drinking water piping materials, and is safe for use in whole-house water purification and direct hot/cold water supply systems.

Q2: What practical benefits does the full-bore design offer for air-source heat pump and underfloor heating systems?

A: The full-bore, non-throttling design offers virtually zero flow resistance, preventing flow reduction and pressure loss. This ensures stable heat exchange efficiency and uniform heating distribution, avoids issues like localized insufficient heating or water circulation bottlenecks, and reduces equipment energy consumption.

Q3: How does the blow-out-proof stem design address common safety issues in piping systems?

A: Frequent starting and stopping of underfloor heating or air-source heat pump systems can cause instantaneous high-pressure surges; standard stems can easily be forced upward, creating gaps that lead to leaks. Our product features a back-sealing, blow-out-proof stem that securely locks the internal mechanism, withstands pressure fluctuations, and eliminates safety hazards such as high-pressure water spraying or system leaks.

Q4: Is the extended handle easy to operate in tight spaces, such as concealed ceiling piping or embedded equipment lines?

A: It offers excellent adaptability. The extended handle provides sufficient leverage without requiring extensive clearance for operation. It allows for easy 90-degree opening and closing in confined areas—such as concealed ceiling spaces, narrow equipment gaps, or enclosed cabinets—without obstruction or binding, making routine inspections and adjustments convenient.