Routine maintenance of all welded pneumatic ball valve and maintenance during grease injection The problem of grease injection amount is often ignored when grease injection is conducted to the grease injection valve of all welded pneumatic ball valve. After the grease gun is refueled, the operator selects the grease valve and grease connection mode to conduct grease injection. In the process of grease injection, on the one hand, the amount of grease injection is small and insufficient, and the sealing surface is accelerated to wear due to the lack of lubricant. On the other hand, excessive grease injection causes waste. The reason is that the sealing capacity of different valves has not been accurately calculated according to the nominal diameter of the valve, and the sealing capacity has been calculated, and then an appropriate amount of grease has been reasonably injected.

The joints of pneumatic butterfly valves are various
As we know, as an important connection equipment in modern engineering equipment, the connection is naturally essential. Next, let's introduce some connectors.
NPT, PT, G are pipe threads
NPT is the abbreviation of National (American) Pipe Thread, and NPT is the American taper pipe thread used for sealing. The 60 degree taper pipe thread belongs to the American specification, and is used in North America. National specifications can be referred to GB/T12716-1991PT is the abbreviation of Pipe Thread, which is a 55 degree sealed taper pipe thread. It belongs to Wyeth thread family, and is mostly used in Europe and the Commonwealth countries. It is commonly used in water and gas pipe industries, and the taper rule is 1:16. National specifications can refer to GB/T7306-2000G, which is a 55 degree non thread sealing pipe thread and belongs to Wyeth thread family. G represents cylindrical thread. Refer to GB/T7307-2001 for national specifications. G is the general name of pipe thread (Guan). 55 and 60 degrees are functional, commonly known as pipe circle. That is, the thread is machined from a cylindrical surface.
Metric threads are represented by pitch, and American and British threads are represented by the number of threads per inch, which is the biggest difference between them.
Metric thread is 60 degree equilateral thread, inch thread is 55 degree isosceles thread, and American thread is 60 degree.
Metric units are used for metric threads, and English units are used for American and British threads.