Flare Fittings Manufacturers

Legines Industrial Machinery Inc. is a professional flare fitting manufacturer and SAE 45° flare fitting supplier in China, focusing on the precision machining and manufacturing of brass fittings, stainless steel fittings and air brake hose assemblies. The company has a modern plant of 3,600 square meters, equipped with 45 fully automatic CNC machine tools, 35 semi-automatic CNC processing equipment and 3 sets of high-precision testing instruments, with an annual output of more than 2.5 million sets of various fittings and assemblies, and has a strong batch delivery capability and product quality assurance system.

Flare fittings are a widely used mechanical connection method in liquid and gas pipeline systems, especially suitable for occasions requiring high sealing, high pressure resistance and repeatable disassembly and assembly. The basic principle is to process the metal pipe end into a 45° conical expansion surface, and then accurately match the conical sealing surface in the fitting body, and use the locking force of the nut to press into the connector to form a metal-to-metal sealing interface. Flare fittings are widely used in industrial fluid systems with high requirements for sealing and reliability due to their high reliability, high adaptability and easy maintenance. Its design follows the principle of precise conical surface matching and metal sealing, and has replaced welding, gluing or soft sealing in many occasions, especially in the fields of aerospace, refrigeration systems, gas equipment, hydraulic machinery, etc.

The nut is a hexagonal or cylindrical part used to firmly lock the pipe to the fitting body through the internal thread. When tightened, the nut presses the expanded pipe end against the sealing cone to achieve sealing. Some expanded structures use metal ferrules, which are located outside the pipe to enhance the locking force and sealing, especially for high-pressure systems. The pipe end is expanded at a 45° angle to form a cone surface as a sealing interface, and cooperates with the precision-machined conical seat surface on the fitting body to achieve metal-to-metal sealing. A conical sealing seat is provided inside the fitting body, which precisely matches the expanded part of the pipe. The design of the fitting body needs to ensure mechanical strength and sealing stability under long-term use. The sealing surface of the fitting is usually precision-machined to ensure close contact with the expanded cone surface to prevent leakage, and maintain a safe and reliable sealing effect even in high-pressure environments.

The selection of flare fitting materials should comprehensively consider corrosion resistance, strength, processing performance and cost. Brass is one of the most commonly used flare fitting materials. It has excellent corrosion resistance, as well as good resistance to water, gas and certain acids and alkalis. It is suitable for medium and low pressure systems, such as gas, water pipes, refrigeration and other occasions. Its processing performance is also very good, easy to turn, flare and weld. Using brass as a flare fitting material has good sealing performance and is suitable for sealing with metal or hoses. Stainless steel is suitable for high pressure and high corrosion environments. It is often used in chemical, marine, food grade or high temperature environments. Common grades include 304 and 316, which have higher structural strength and durability. It is economical and applicable, mainly used in industrial environments where corrosion resistance is not required. It is suitable for large multi-functional machinery or fluid systems. Aluminum flare fittings are lightweight and suitable for aerospace, automotive and other occasions where weight control is strict, while having good corrosion resistance. Copper has excellent electrical and thermal conductivity and is often used in refrigeration, air conditioning (HVAC) and other systems, especially in occasions where high thermal conductivity is required.