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The valve
rings (KX-GT) are made of specially treated graphite. They have no
asbestos-containing materials and make the valve maintenance-free.
Simply "install and forget." The coupling pressure on the
piston is so high that media are reliably checked to 900 psi in any
aggregate condition and at temperatures ranging fro -50º F to
+800º F. The various expansion coefficients of the valve
components which arise during alternating thermal loads are fully
compensated by the valve rings. They are reliably tight in all
operating states.
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