In modern pipeline system construction, pipe joints plays an irreplaceable function. VSSJA-2 double flange loosing stop expansion joint is also called B2F pipe compensator in China, it consists of body, follower, gland and slip pipe. VSSJA-2 double flanges loosing stop expansion joint two ends are flanges connection. This type expansion joint will make movements freely under allowable movements value, once exceed the movements, the limited rods will make affects and limit the movements and protect the expansion joint.

How to distinguish VSSJA-2 double flanges loosing stop expansion joint and VSSJAFC dismantling joints with three flanges from the appearance?

Take VSSJA-2 double flanges loosing stop expansion joint and VSSJAFC dismantling joints as example. Please check the drawings and photos:

VSSJA-2

VSSJAFC

(1) From the left side flange of two drawings, VSSJA-2 metallic expansion joints bolts will not higher than flange face, and size is smaller than flange drilling size and bolts holes are with thread; VSSJAFC force transferring bolts are higher than flange face and bolt holes size are same with standard flange drilling size;

(2) After assembling, the long bolts end nuts of VSSJA-2 double flanges loosing stop metallic expansion joint are not touched with the flange, because the slip pipe will move until the limited bolts and nuts will stop slipping and protect the expansion joints; The nuts of VSSJAFC will touch with the flanges and make force transferring function;

(3) The nuts number of VSSJA-2 double flanges loosing stop metallic expansion joint long bolts is 3, the nuts number of VSSJAFC dismantling joints with three flanges is 4.