The electric ball valve and plug valve can wipe the sealing surface in the process of opening and closing, so it is suitable to be used in the medium with suspended particles. At present, no matter in petroleum, chemical industry or other industries, valve application, operation frequency and service are changing, so it is necessary to control or eliminate even slight leakage. If the back and forth movement of the closing member to the seat is vertical, particles may be trapped. Therefore, the valve is only suitable for basic clean media unless the sealing surface material can allow the particles to be embedded.
Valves and valves are unique in the field of valve control and service. After procurement, the valve inspection and maintenance are not timely, resulting in valve repair and leakage or ineffective opening and closing; the valve is not regularly repaired and pressure tested, and even has not been cleaned, pressure tested and technical appraisal for many years.
2. The debris was deposited in the valve, and the valve was not closed tightly, causing serious oil leakage and oil leakage; the valve was not closed after maintenance, or the pipe orifice was not blocked after the valve was removed; the valve dust flange gasket used oil resistant and pressure resistant materials. Therefore, it is necessary to strengthen the inspection of the valve, and strive to prevent the trouble in the bud.