What is this type of centrifugal pump flush fitting called?
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Are there any standards for centrifugal pump flush pipe fittings, and where can they be purchased?
Try searching for concave-convex pipe fittings on Taobao.
Ball joint connection, threaded connection. The sealing is good!
For spherical joints, it is best to ask the sealing manufacturer for them; the material used depends on the medium in which they will be used.
This is usually found with the original manufacturer; it should be the machine seal flushing water pipe
Spherical hard-sealed joint or high-pressure oil tube joint
This is generally called a CGA cylinder fitting