An ON/OFF Valve is the fluid equivalent of an electrical switch, a device that either allows unimpeded flow or acts to prevent flow altogether.

On -Off valves are often used for routing process fluid to different locations by starting and stopping batch processes, and engaging automated safety (shutdown) functions.

An on-off valve is a much less precise instrument than the control valve. It either allows for unimpeded flow or it shuts off flow completely. There are a couple of different styles of on-off valves, including ball, plug, butterfly, gate, and globe valves.

A ball valve consists of a ball with a channel cut through it that can be turned so the channel aligns with the rest of the line, allowing flow, or so that it doesn’t, shutting off flow. Butterfly valves have a flat piece of metal that rotates to open or close the channel. Gate valves and plug valves use conical pieces that slide down through the channel, sealing it securely shut.

Full Bore valves are specifically designed that can the complete flow of the fluid in the line without any restriction.

However, Reduced bore Valve are designed such that the port size is slightly smaller that the line ID and hence there is some restriction to the flow.

There are several reasons to be considered before selecting reduced bore or full bore valves

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