Process valves usually do one of two things; they regulate the amount of flow, or the direction of flow passing through them.
Ball valves, plug valves and butterfly valves are very common process control valves. They are relatively inexpensive and reliable.
These valves all serve the same basic purpose of allowing or cancelling flow, but they are designed to function at different pressures.
Ball valves can withstand more pressure than butterfly valves.
Plug valves are even stronger. They are used to control extreme pressure.
Both valve styles are excellent for use as a quick shutoff valve.
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