Brass Double Female Thread Union

The Brass Double Female Thread Union is suitable for residential water supply, commercial HVAC systems, heating pipelines, industrial circulation systems, solar water heating equipment, and equipment connection points that require periodic maintenance.

Its detachable structure is particularly useful around valves, filters, water meters, pumps, and other components that may need to be inspected or replaced. Instead of cutting the pipeline, the union connection can be released to simplify component replacement and reduce maintenance work.

Main Specifications

The listed pressure value of ≤1.6 MPa applies under normal-temperature conditions and should not be interpreted as a universal pressure rating across the entire temperature range. Actual allowable pressure can be affected by working temperature, medium, thread specification, installation method, and operating conditions.

Size Reference

The dimensions above are reference values. Actual dimensions may vary according to the selected model, thread standard, and production requirements. NINGXING can provide drawings or customized dimensions for special applications.

Manufacturing Details

1. Brass Forging

The Brass Double Female Thread Union is manufactured using brass forming and precision machining processes. CuZn39Pb3 brass provides a combination of strength, ductility, and corrosion resistance suitable for conventional pipeline applications. The forming process helps maintain a consistent body structure and reduces the risk of defects that may affect connection reliability.

2. Thread Processing

Internal threads are machined using precision equipment to maintain dimensional consistency and smooth thread engagement. Thread gauges are used during quality inspection to reduce installation problems caused by incorrect thread dimensions, poor engagement, or thread damage.

3. Inspection Process

Production inspection covers material verification, dimensional accuracy, thread engagement, appearance, and sealing performance. Pressure and leakage checks are performed according to the applicable product requirements before shipment. This process helps ensure that the fitting can be installed correctly and maintain a stable connection during normal service.

Product Comparison

The main difference is the detachable union structure. A conventional threaded connector is primarily intended to establish a fixed connection, while this design allows connected equipment or pipeline sections to be separated more conveniently during maintenance.

Customer Applications

1. Industrial Cooling System

In a chemical factory cooling-water circulation pipeline upgrade, the customer needed to connect multiple externally threaded pipeline sections while reducing leakage and maintenance problems caused by temperature changes and long-term operation. NINGXING Brass Double Female Thread Union was selected because its detachable structure simplified future maintenance, while the brass body provided suitable corrosion resistance for the specified cooling-water application.

2. Commercial HVAC System

A commercial building required multiple connections between air-conditioning equipment and chilled-water pipelines. Limited equipment-room space made conventional welding inconvenient, particularly where components might require later replacement. The union structure allowed installers to complete threaded connections and provided easier access for subsequent inspection and equipment maintenance.

3. Residential Pipeline Repair

In an older residential water supply system, a leaking connection needed to be replaced without removing a large section of existing piping. The detachable structure allowed the maintenance technician to disconnect the affected component and install a replacement without cutting the complete pipeline. This reduced repair work and helped shorten the service interruption.

Application Limits

1. Suitable Media

The product is intended for water, air, oil, gas, and other non-corrosive media under compatible operating conditions. Common applications include water supply, heating, HVAC, equipment connection, and general industrial pipelines.

2. Media Restrictions

The fitting should not be used directly with strong acids, strong alkalis, highly corrosive chemicals, seawater, or other aggressive media unless material compatibility has been specifically evaluated. Brass performance can vary depending on chemical composition, concentration, temperature, and exposure time.

For special fluids, customers should provide the exact medium, concentration, operating temperature, pressure, and service conditions to NINGXING for technical confirmation before ordering.

3. Pressure Restrictions

The reference working pressure is ≤1.6 MPa at room temperature, approximately 20℃. This value is not a blanket rating for every temperature and medium. Allowable pressure may need to be reduced as operating temperature increases or when the fitting is exposed to demanding service conditions.

The product should not be operated above the specified pressure or temperature range. Severe vibration, external impact, incorrect thread matching, excessive tightening, or unsuitable sealing materials may also affect connection performance.

Installation Notes

Before installation, confirm that the fitting thread matches the external thread of the connected pipe or component. Clean the threads and sealing surfaces before assembly and apply suitable PTFE thread sealing tape or sealing compound where required by the connection design.

During tightening, use an appropriate wrench on the designated wrenching surface and avoid excessive torque. After installation, the pipeline should undergo a pressure or leakage test under controlled conditions before being placed into normal service.

FAQ

What media can be used?

The Brass Double Female Thread Union is mainly suitable for water, air, oil, gas, and other non-corrosive media. For aggressive chemicals, seawater, strong acids, or strong alkalis, material compatibility should be confirmed before use.

What does the 1.6 MPa pressure rating mean?

The ≤1.6 MPa value refers to the reference working pressure at normal temperature, approximately 20℃. It does not mean that the fitting can continuously operate at 1.6 MPa throughout the full -20℃ to +120℃ temperature range.

Can it be used at high temperatures?

The stated working temperature range is -20℃ to +120℃. However, pressure capacity and sealing performance can be affected by temperature, so high-temperature applications should be evaluated together with the actual working pressure and medium.

What is the advantage of the union structure?

The union structure allows the connected pipe or equipment section to be separated more easily during maintenance. This is useful for valves, filters, meters, pumps, and other components that may need periodic replacement or inspection.

What certifications are available?

NINGXING operates under an ISO9001:2015 quality management system, and the applicable products meet CE and RoHS requirements. Certification or compliance documents can be provided according to the specific product and order requirements.

Quality & Supply

NINGXING focuses on the production of brass pipeline connection components for industrial and commercial applications. From brass material selection and precision machining to thread inspection and finished-product testing, production is controlled according to defined quality procedures.

For standard sizes, bulk supply is available. OEM/ODM production can also be arranged for customers requiring special thread standards, dimensions, or surface finishes. Buyers can provide their pipeline drawings and operating conditions to confirm the appropriate specification before purchasing.