If we want to discuss how to distinguish the three standards of hydraulic transition joint, we need to make clear that the types of common joint generally include end straight joint, straight joint, three-way joint, elbow, union nut joint, hinge joint, plug, transition joint, etc., while the composition of double ferrule joint includes front snap ring, rear snap ring, And nuts.
The materials used for a series of joints, such as hydraulic transition joints, are usually stainless steel and copper. Metric, American and British threading standards NPT, PT, G are pipe threads. NPT is the abbreviation of National (American) Pipe Thread. It belongs to the American standard 60-degree tapered pipe thread. It is used in North America. The national standard can be consulted in GB/T 1276-1991. PT is the abbreviation of Pipe Thread. It is 55-degree sealed tapered pipe thread. It belongs to the Whitworth thread family and is mostly used in European and Commonwealth countries. Usually used in water and gas pipe industry, taper is 1:16. National standards can be consulted in GB/T7306-2000, where G is a 55-degree non-threaded sealing pipe thread, belonging to the Whitworth thread family, marked G represents cylindrical thread.
Hydraulic transition joints and water pipe joints are the same. The old label is Rc. Metric threads are expressed by pitch. American and British threads are expressed by the number of threads per inch. This is the biggest difference between them. Metric threads are in metric units, and American and British threads are in British units. The nominal diameter refers to the diameter of the pipe connected. Obviously, the large diameter of the thread is larger than the nominal diameter.