Operating conditions of plug valves
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We use it at the connection point of the loop reactor in the polymerization unit; there is some powder available, in sizes of 5\" and 8\", with a pressure of 1.0 MPa and a temperature of 70 degrees. The nameplate indicates that it is a sleeve plug valve, likely made of FTPE material. At present, it cannot be completely closed, which affects the operation of the unit.
What brand is yours? Is it fully lined or partially lined? Also, have you checked to find out the cause or the symptoms?
It should be a PTFE-lined plug valve; the fluid passing through such valves must be free of particles, as otherwise it will affect their service life. Since there is powder in your medium, it is recommended to use a wear-resistant cut-off valve!
Ball valves can achieve VI-level sealing, and there are many reasons why leakage may occur: seals, incomplete closure, cold flow in the bushings... Hard-sealed ball valves and butterfly valves work as well; however, if cost is a concern, metal ball valves are the better choice. Soft-sealed valves can also achieve zero leakage.
He didn’t disassemble the valve, so it’s difficult to determine the cause through such analysis! However, half-butterfly plug valves can be used in environments with particulate media