What Is a Coupling Plug?
A coupling plug is used to connect pipes when laying piping, especially for smaller pipe sizes. They are generally used for fluids such as air, steam, water, and oil. Available for hoses, steel pipes, and copper pipes, coupling plugs come in various shapes and types, including straight, 90-degree bend, T-shape 3-way, and closed, as well as screwed, one-touch connection, plug-in, and barbed types of connection methods.
Uses of Coupling Plugs
Miniature pipe couplings, a type of coupling plug, are used to connect pipes, tubes, or fittings in various situations when laying piping. They are widely used in the food and chemical industries, as well as in nuclear power facilities and manufacturing machinery, including elbows, nipple unions, tees, bushings, reducers, plugs, and more.
Applicable tube outer diameters range from ø3.2 to ø6 mm, with connection thread sizes of M3, M5, or Rc 1/8.
Principle of Coupling Plugs
Coupling plugs are essential for connecting pipes, fittings, or equipment in piping systems without leaking. They are used as general fittings and to lay out entire piping systems. Barbed or tapered pipe threads join coupling plugs to pipes. One-touch couplings allow for easy connection and disconnection, suitable for installation and maintenance without tools.
The material of the fittings, mainly stainless steel or free-cutting brass steel (some electroless nickel-plated), is chosen based on fluid type and environmental factors such as corrosion resistance. Union fittings are used for adjustable orientation in taper-threaded connections.