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These valves are designed to work in a very wide temperature range (-190 to + 850 ° C). The seal between the disc and the body is not 100% tight shut off, a loss of 1.5 to 2% has been estimated.

The valve construction is done according to the range of temperatures at which the valve will work. When it´s requested, stem extensions to operate de valve are manufactured.

Its main applications are in metallurgy.