Combination sealing arrangement for rotary ball valve

A method to assemble a combination sealing arrangement in a rotary ball valve comprising of a valve body, a rotary ball, the method comprising the steps of:

• (i) stretching an add-on sealing ring up to an extended groove of a seat support with a polarized combination cavity;
• (ii) slipping the add-on sealing ring into the extended groove of the seat support with the polarized combination cavity;
• (iii) pre-heating a compatible seat ring having a plurality of non-parallel concentric surfaces, when assembled so as to temporarily reduce its intrinsic hardness to 20% to 50%;
• (iv) fitting the compatible seat ring forcibly into a non-parallel slot the seat support with the polarized combination cavity by applying a force FF on a face of the compatible seat ring;
• (v) filling of the non-parallel slot of the seat support with the polarized combination cavity by the compatible seat ring;
• and
• (vi) machining the face of the compatible seat ring as per a curvature of the rotary ball.