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The sealing of these valves take place between the disc and the elastic ring inside the body and partially the outer side of the body what makes sealing with the counter flanges. They are bi-directional 100% tight shut off. There is a great variety of choices of materials for the elastic ring, which may be replaceable or vulcanized, so that these valves can be used in a wide range of applications.

These valves have low torque, low pressure drop, and are easy maintenance, self-cleaning, and easy assembly and disassembly. The one piece shaft remains dry, so the fluid does not contact either with the shaft or the body.