Common faults and cause analysis of packing faults in valve faults
Sep 07, 2021
The common faults of the packing mainly include four types: too small pre-tightening force applied to the packing, failure of the fastener, damage to the sealing surface of the valve stem, and failure of the packing. The reasons for these failures may have the following aspects.
(1) The pre-tightening force on the packing is too small for the following reasons: insufficient packing, or insufficient packing quantity, or due to wear, aging and improper packing; or because there is no pre-tightening gap; or due to the pressure sleeve skewed, diameter Too much pressure on the stuffing box; or the screw thread is blocked when the screw is tightened due to the random thread, rust, or mixed impurities.
(2) The reasons for the failure of the fasteners are: the glands, gland nuts, bolts, ears and other parts are broken; or they are loosened due to vibration; or damaged due to corrosion; or due to uneven force and excessive force. , The fastener is damaged by improper operation; or due to inadequate maintenance.
