The flange must possess adequate strength and not deform during the tightening process; the sealing surface of the flange should be flat and clean, and it should be carefully cleaned of oil stains and rust spots during installation.

(1) The flange must have sufficient strength and should not deform during the tightening process; the sealing surface of the flange should be flat and clean, and it should be carefully cleaned of oil stains and rust spots during installation.

(2) The sealing gaskets should possess excellent oil resistance, as well as good elasticity and mechanical strength. During installation, different cross-sections and sizes of sealing gaskets should be selected according to the joint shape, and they should be properly positioned.

(3) The torque on the flange should be even. The compression of the rubber gasket is generally controlled around 1/3.

(4) The convex flange has a circular contact surface, which avoids the bolt holes and allows for easy manufacturing of the custom gaskets. With the same bolt pre-tension, the smaller contact area increases the gasket's compressive strength, facilitating better sealing. During assembly, the flange may deform. If there is no protruding surface and complete contact, the pre-tension is dispersed to the outer edge, not fully utilized. After the flanges are joined, the convex flange forms a narrow gap at the outer edge, making disassembly easier.