Stainless steel pipe fittings, as the key connection between pipes, not only facilitate assembly and disassembly of components and pipes, but also play a crucial role in hydraulic piping, serving as an indispensable bridge. They come in a wide variety of types, among which flared fittings are widely used for linear connections in instrumentation and other fields. Using socket welding or threaded connections, they flexibly adapt to small-diameter, low-pressure pipelines and are often used in areas requiring frequent assembly and disassembly, or for final adjustments to threaded pipe fittings and pipelines. When selecting a fitting, it's important to consider multiple factors, including structural form, operational requirements, and cost, to ensure the fitting's performance and suitability.
Because hydraulic hose fittings are detachable connectors, they must not only meet basic requirements such as secure connection, good sealing, reasonable size, low pressure loss, and excellent process performance, but also require easy assembly and disassembly. Therefore, these seemingly insignificant fittings are actually the key to the success of hydraulic systems.
Hydraulic hose fittings come in a wide variety of types, with the most common types being rigid pipe fittings and hose fittings. Further subdividing, rigid pipe fittings can be categorized into three types: flared, compression, and welded. Hose fittings are primarily crimped.
In hydraulic systems, the connection methods for pipes and hydraulic hose fittings vary. Typically, the threaded end of the pipe is connected using a connecting thread. Tapered threads, tightened by a cone and sealed with materials such as polytetrafluoroethylene, are primarily suitable for medium- and low-pressure hydraulic systems. Fine threads, due to their excellent sealing properties, are often used in high-pressure systems but require end-face sealing with a combination washer or O-ring. Copper washers are also commonly used and are particularly suitable for connecting thicker-walled pipes. This connection method primarily consists of a fitting body, a receiver, and a nut. During use, the fitting body is inserted into the target pipe, and the end face is sealed with a washer. Rubber or ball seals are also used for additional sealing.
Quick-change fittings are also available, with or without check valves. Quick-change fittings with check valves automatically seal when disconnected, while a movable pin opens the check valve when connected. Its self-locking function relies on the steel ball embedded in the groove and locked by the "cone-cylinder" sleeve. This joint is compact and easy to use, saving space, and the threaded part is coated with sealant, which can achieve sealing without the need for additional tape.