The zone shut-offs shall be 3 piece, ball-type design with a brass forging body and a chrome plated, brass ball for sizes 1/2″ to 2″. Ball seats, stem seals and stem washer shall be reinforced Teflon (PTFE), with Viton stem and flange O-rings. A blow-out proof stem shall be used and the zone shut-off shall have a maximum pressure rating of 600 psi (4,137 kPa). All zone shut-offs materials shall be compatible with medical gases or vacuum service to 29″ Hg (98.205 kPa).
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