1, the ring deformation. Ring contraction, the air leak valve action failure, insufficient actuator output force; bubble oil seals swell, friction increases, lack of valve inoperable or actuator output force; seal hardening, friction and surface wear, the air leakage increase in volume Great; friction increases, and the valve actuator malfunction.
2, the environment. Chemical industrial raw materials in direct contact with air spaces feedstock chemical properties change; industrial furnaces and other places in direct contact with the flame of fire danger; the use of air measuring instruments due to nozzle clogging and failure; avoid oil requires extreme environment due to the valve and actuator sealing portion of oil leakage caused by environmental pollution, oil removal method is to use the oil filter. For example, in addition to the centrifugal oil mist particle filter, activated carbon adsorption, or with the use of porous filter degreasing.