Stainless Steel Hydraulic Fittings

Stainless steel hydraulic fittings is the core component of hydraulic system for connecting pipelines and controlling fluid transmission, which is widely used in the fields of ships, food processing, medical equipment and industrial machinery because of its corrosion resistance, high strength and long life. This article from the meaning, type, identification methods, installation specifications, price. Several dimensions of in-depth analysis, combined with industry standards and practical experience, to help users quickly grasp the key knowledge of stainless steel hydraulic couplings.

Meaning of stainless steel hydraulic Fittings

Stainless steel hydraulic Fittings is 304, 316L stainless steel as the main material for the manufacture of hydraulic connection components, through the thread, ferrules, welding and other ways to realize the pipeline sealing and pressure transmission.
Its core advantages include:
1. corrosion resistance: resistance to seawater, acidic media, high temperature steam and other corrosive environments, the service life of carbon steel Fittings extended by 3.5 times;
2. high cleanliness: in line with the food grade (FDA) and medical grade health standards, suitable for pharmaceuticals, dairy products and other aseptic environments;
3. high pressure capacity: pressure range up to 50 100MPa, to meet the stability needs of high-pressure hydraulic system.

The main types of stainless steel hydraulic Fittings

According to the structure, function and connection mode, the types of stainless steel hydraulic fittings can be divided into the following five categories:

1. Classification by connection method

Hydraulic ferrule fittings : Sealing is realized by embedding the ferrule edge into the pipe wall, applicable to high-pressure scenarios (e.g. GB/T3733 standard);
Hydraulic welded fittings: Argon arc welding to connect the pipeline, sealing, commonly used in high temperature or vibration environment;
Hydraulic flared fittings: rely on the flared cone and nut compression sealing, mostly used in low-pressure systems;
Hydraulic quick Fittings: two-end open and closed type and two-end open type, support rapid disassembly and assembly, reduce downtime.

2. Classified according to the interface form

Hydraulic straight fitting: connecting the same straight line;
Hydraulic Tee / T-type fittings: shunt or merge the fluid;
Hydraulic right-angle Fittings: change the direction of the pipeline, saving space.

3. Special function type

Hydraulic swivel joints : Allow the pipeline to rotate relative to each other, suitable for dynamic equipment such as robotic arms;
Hydraulic Bulkhead Fittings : Used for the connection between fixed panels and pipelines, simplifying the installation process.

How to identify high quality stainless steel hydraulic fittings

1. Material identification

Magnetic test: Stainless steel (304, 316L) is non-magnetic, while martensitic stainless steel (e.g., 410) has a weak magnetism, which can distinguish ordinary steel;
Chemical testing : 316L contains molybdenum (Mo ≥ 2.5%), chlorine ion corrosion resistance is significantly better than 304, which can be verified by spectrometer.

2. Technology and certification

Surface marking: Regular products are labeled with material code (e.g. SUS316L), production standard (ISO 8434, DIN 2353) and pressure resistance level;
Sealing inspection: The edge of the ferrule should be evenly cut into the pipe wall to form an annular projection, without burrs or deformation;
Certification documents: Suppliers are required to provide ISO 9001 quality certification, CE safety certification and pressure resistance test report.

Stainless Steel Hydraulic Fittings Price List

Stainless steel hydraulic fittings installation specifications and precautions

1. Preparation before installation

Cutting and deburring: Use special pipe cutting machine or sawing machine to cut, ensure the verticality of the end face ≤ 0.5 °, and use the chamfering device to remove internal and external burrs;
Cleaning: Use alcohol or high-pressure gas to remove impurities in the pipeline to avoid contamination of hydraulic oil.

2. Installation steps (taking ferrule fittings as an example)

1. Pre-installation of ferrules: Insert the nut and ferrules into the pipe end and tighten them manually after inserting them into the fitting body to ensure that the inner edge of the ferrules cuts into the pipe wall by 0.1 0.3mm;
2. Formal tightening : Use torque wrench to tighten according to the standard torque (e.g. φ16mm tube needs 259N-m), and then rotate 1/4 turn to the torque surge point;
3. Seal test: Pass in 1.5 times the working pressure fluid, hold pressure for 5 minutes without leakage.

3. Key Notes

Avoid cross use: the structural differences between different brands of fittings can easily lead to leakage, need to standardize the specifications;
Lateral force prevention : Pipes should be fixed with pipe clamps, and the spacing should be set according to the pipe diameter (e.g., φ25mm pipe spacing of 1.5 to 2 meters) to prevent vibration-induced loosening;
Lubrication: Stainless steel threads should be coated with special grease (such as molybdenum disulfide) to reduce friction damage.

Conclusion:

The correct selection and installation of stainless steel hydraulic fittings is directly related to the safety and efficiency of the hydraulic system. Through material testing, standardized operation and regular maintenance (e.g. checking the condition of seals every six months), the failure rate can be significantly reduced. For customized solutions, please contact our engineers.

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