Piston Valves TPC type:Pneumatically operated ON-OFF valves designed for the use with Steam, Hot Water, Cold Water, Air, Gas or on Vacuum Service Description: Piston Valves Application: 2-Way and 3-Way Series: TPC These valves are pneumatically operated ON-OFF valves designed for the use with steam, hot water, cold water, air, gas, or on vacuum service. These are especially used as automatic valves for tire curing presses.