Automatic Flow Control ValveControl ValvesPressure ControlIdle Air ControlA flow control valve regulates the flow or pressure of a fluid. Flow Control valves normally respond to signals generated by independent devices such as flow meters or temperature gauges. Control valves are normally fitted with actuators and positioners. Pneumatically-actuated globe valves are widely used for control purposes in many industries, although quarter-turn types such as (modified) ball and butterfly valves are also used.Control valves can also work with hydraulic actuators (also knPipes, pipeline construction and valves - ScienceDirectJan 01, 2000 · Valves used in waterworks may be listed as stop valves, non-return valves, flow control valves, pressure control valves, energy dissipaters, and air valves. Valves may be operated by hand or by actuator. Actuators generally are electric and may be operated locally or by remote control. In places where there is no local power supply, portable Why is gate valve forbidden in oxygen pipeline?Oct 23, 2019 · Why is gate valve forbidden in oxygen pipeline? It is forbidden to use gate valve in oxygen pipeline because sealing surface of the gate valve will be damaged by friction in the relative movement (i.e . opening and closing of the valve), once damaged, there is iron powder falling off from the sealing surface, such fine particles of iron powder are easy to burn, which is the real danger.