When installing a pinch valve to a rubber, PVC, or any "slick" mating flange, we recommend that you install a metal serrated gasket between the two flanges to assist in the seal.

The experiment proved that the corrugated serrated gasket has the good compressive resilience property and it is an ideal gasket for high temperature high pressure and some severe working condition.

Flange facing finish shall be serrated finish in accordance with applied standard in case of soft gasket.