Establishing Fundamental Elements In Needle Valve Function

Jun 26, 2018  

Article Needle Valves (B0de916)

If you recall the design of the check valve, you will remember that a check valve closes when there is back flow pressure applied on the spring check. The flow control element is a disk of approximately the same diameter as the inside diameter of the adjoining pipe, which rotates on either a vertical or horizontal axis. Once the valve is inservice with specified back pressure applied at service temperature of 400° F, it should open at the desired set pressure of 500 psig.Three way ball valves have an L” or T” Shaped Port Hole through the middle for suitable service

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