A valve controls the flow and pressure of contents in any piping system, whether they are oil, gas, liquid, or vapors. To stop or start a flow, a plug valve uses a tapered or cylindrical plug as long as the plug passage is open. A valve controls the flow and pressure of contents in any piping system, whether they are oil, gas, liquid, or vapors. To stop or start a flow, a plug valve uses a tapered or cylindrical plug as long as the plug passage is open.
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