The Conval Bellows Seal can be supplied with a manual operator, an air operator or a motor operator. The valve will open and close when actuated by the operator. The valve plug acts as a sealing element in the valve passageway to stop the flow of the process medium. When the valve plug is tightly sealed against the valve seat, the valve is closed. When the valve plug is away from the valve seat, the valve is open. Valves isolate (shut-off), switch, and control the flow of fluids in a piping system. These valves can be operated manually with levers, wrenches, and gear operators or remotely with electric, pneumatic, electro-pneumatic, and electro-hydraulic powered actuators.
Manually operated valves (hand valves) are typically used where operation is infrequent and/or a power source is not available. Powered actuators allow valves to be operated automatically by a control system and locally or remotely with push button stations. Valve automation brings significant operation advantages in the areas of process quality, efficiency, safety, and productivity.
Globe valves have a conical plug which reciprocates into and out of the valve port. Globe valves are ideal for shutoff as well as throttling service in high pressure drop and high temperature applications. Available in globe, angle, and y-pattern designs. Manual operation is accomplished through a multi-turn handwheel assembly. Multi-turn electric actuators are typically required to automate globe valves, however linear stroke pneumatic and electro-hydraulic actuators are also available.