Brass Double Thread 90-Degree Elbow Fitting

The two ends feature matching female threads, allowing connection with male-threaded pipes, valves, meters, and other fittings. The 90-degree configuration helps simplify pipe routing in confined installation spaces without additional bending work. NINGXING manufactures the Brass Double Thread 90-Degree Elbow Fittings with CNC machining and controlled production processes and provides standard and customized thread options for different markets.

Connection Configuration

1. Double Female Thread Design

The double female-thread configuration provides a practical way to connect two male-threaded components while changing the flow direction by 90°. Common thread standards include BSP, BSPT, BSPP/G, NPT, and PT, with specific thread combinations available according to project requirements.

The compact elbow body is suitable where straight pipe connections require additional installation space. Proper thread matching and sealing materials should always be confirmed before installation to ensure reliable service.

2. Brass Body Construction

The fitting is manufactured from brass, with the material selected according to the required mechanical and environmental conditions. Brass provides good resistance to oxidation and corrosion in many water and general industrial environments while maintaining sufficient strength for threaded assembly.

For applications involving drinking water, gas, refrigerants, chemicals, or other regulated media, the material grade and applicable local standards should be confirmed before ordering.

Manufacturing and Quality Control

NINGXING operates as a brass fitting manufacturer in Zhejiang, China, with production capabilities covering brass bar preparation, forging, CNC machining, threading, finishing, inspection, and packaging.

The elbow body can be produced through forging to obtain a relatively dense structure before precision machining. CNC equipment is then used to process the internal threads, passage, and connection surfaces. This manufacturing route helps maintain dimensional consistency between production batches and supports OEM and non-standard orders.

The production system follows ISO 9001:2015 quality management requirements. Products are also available with CE and RoHS-related compliance documentation according to the applicable product specification and order requirements.

Product Testing

1. Pressure and Leakage Testing

Each production batch is subject to pressure and leakage inspection according to the applicable product specification. Hydrostatic or water-pressure testing can be used to check the integrity of the fitting body and threaded connection areas, while leakage inspection helps identify defects that could affect sealing performance.

The reference pressure is up to 1.0 MPa (10 bar / approximately 145 psi) for applicable specifications. Actual allowable pressure depends on fitting size, thread type, temperature, medium, sealing method, and installation conditions, so the confirmed technical specification should be used for final system selection.

2. Thread and Dimensional Inspection

Thread gauges and dimensional measuring equipment are used to verify critical connection dimensions. Inspection focuses on thread compatibility, pitch, diameter, body dimensions, and machining quality to reduce installation problems such as cross-threading, excessive looseness, or incomplete engagement.

Visual inspection is also performed to identify burrs, surface damage, machining defects, and other visible abnormalities before packaging.

Operating Conditions

The Brass Double Thread 90-Degree Elbow Fitting is commonly used for water, air, oil, hot and cold water, and selected low-pressure fluid systems. For applicable configurations, the maximum continuous working temperature can reach 150℃, provided that the pressure, medium, sealing material, and other operating conditions remain within the specified limits.

A temperature of 150℃ should not automatically be treated as suitable for every application. Continuous operation at elevated temperatures can affect seals and allowable pressure, so the actual working temperature and pressure should be evaluated together. Applications involving steam, fuel gas, refrigerants, medical gases, aggressive chemicals, or other special media require confirmation of material compatibility and applicable regulations before use.

Project Applications

1. Residential Water Piping

In residential construction and renovation projects, the fitting can be used for hot and cold water lines where a 90-degree directional change is required. One housing project used DN15-DN25 fittings in kitchen and bathroom piping. The double female-thread configuration allowed installers to connect the elbow directly to male-threaded pipe sections, reducing the need for additional transition components and simplifying installation.

2. Industrial Refrigeration

A cold-chain logistics company required a 90-degree modification to an existing refrigeration pipe layout where installation space was limited. The customer selected a DN40 fitting because its compact elbow configuration allowed the pipeline to change direction within the available space. The brass body provided suitable corrosion resistance for the selected operating environment, while the threaded connection simplified maintenance and replacement.

3. Gas Piping

A municipal gas pipeline project required 90-degree directional connections in selected sections of the system. The project used brass elbow fittings with the required thread configuration and sealing method. For gas applications, however, a general-purpose brass fitting should not automatically be considered suitable for every gas installation. The fitting, sealing material, pressure rating, and certification must comply with the applicable local gas regulations and project specifications.

4. HVAC Systems

A commercial building used brass elbow fittings in sections of its HVAC piping where space limitations required compact directional changes. The 90-degree body reduced the routing space required around equipment and ceiling structures while allowing threaded components to be connected without welding.

Size Reference

Dimensions are provided for reference. Final dimensions should be confirmed according to the selected model and thread standard.

Technical Specifications

Selection and Installation

1. Thread Matching

Before ordering, confirm the nominal size and thread standard of both mating components. BSPT, BSPP/G, NPT, and other thread standards are not automatically interchangeable even when their nominal sizes appear similar. Buyers should provide thread specifications, drawings, samples, or existing fitting information when the standard is uncertain.

2. Sealing Method

For threaded connections, an appropriate PTFE tape or thread sealant may be required depending on the thread design and system requirements. The sealing method should be compatible with the transported medium and operating temperature. During installation, the threads should be aligned correctly and tightened with suitable torque. Excessive tightening may damage the threads or fitting body.

Application Limitations

The Brass Double Thread 90-Degree Elbow Fitting should be selected according to actual pressure, temperature, medium, thread standard, and applicable regulations rather than by material alone. General-purpose brass fittings should not automatically be treated as certified components for drinking water, natural gas, medical gas, refrigerant, steam, or aggressive chemical systems.

RoHS compliance is an environmental-materials requirement and does not mean the fitting is certified for drinking water use. If the product will be installed in a potable-water system, buyers should specify the applicable drinking-water certification or low-lead requirement for the target market.

For gas applications, confirm the required gas-system certification, pressure rating, sealing method, and local installation requirements before purchase. For steam, high-temperature fluids, refrigerants, chemicals, or corrosive media, material and seal compatibility should be evaluated with NINGXING before production.

FAQ

Q1: What is the main function of this fitting?

A: It connects two male-threaded components while changing the pipeline direction by 90-Degrees. The double female-thread design is suitable for connecting pipes, valves, meters, and other threaded components.

Q2: What pressure can it withstand?

A: The reference pressure is up to 1.0 MPa (10 bar / approximately 145 psi) for applicable specifications. The actual allowable pressure depends on size, thread type, temperature, medium, and installation conditions.

Q3: Can it continuously operate at 150℃?

A: For applicable models, the maximum continuous working temperature can reach 150℃ when pressure, medium, seals, and other conditions remain within the specified limits. A 150℃ rating should not be applied universally to every size or application.

Q4: Can it be used for drinking water?

A: Not automatically. RoHS compliance does not equal drinking-water certification. If the fitting is intended for potable water, buyers should specify the required low-lead material and drinking-water certification for the destination market.

Q5: What certifications are available?

A: NINGXING operates under an ISO 9001:2015 quality management system, and the product range can be supplied with CE and RoHS-related compliance documentation according to the applicable specification.

NINGXING Supply

NINGXING provides brass pipe fittings for distributors, engineering contractors, plumbing suppliers, equipment manufacturers, and industrial buyers. The Brass Double Thread 90-Degree Elbow Fitting is available in standard sizes and can be customized for different thread standards and project requirements. Buyers can provide drawings, samples, thread specifications, quantity requirements, and application conditions for technical confirmation before placing an order.