Day-to-day maintenance of the control valve include the following

1. Eliminate stress. Caused by improper installation or a combination of all kinds of stress. For example, the high temperature medium thermal stress, tight installation. Solid power imbalance caused by stress. Imbalance effect of stress on the control valve, the control valve stem deformation of the guide is not correct and the seat of the cause leakage variation increase. Therefore, in the day-to-day maintenance should be carried out maintenance work to eliminate stress.
Remove rust and dirt. Always check the control valve connected to the pipeline and whether the rust, welding slag, dirt, etc., found should be promptly removed. Because the dirt will cause the control valve spool and seat wear, affecting the normal operation of the control valve. Usually, before the control valve to the installation of filters and other filtration devices, and regular cleaning.
Check control valve support. The support of the control valve so that the control valve member is not subject to the position of the gravity influence. If the support improper use can cause the control valve stem and the valve seat is not in increased deterioration of the sealing performance degradation. Therefore, you should check valve support is appropriate.
4 Clear the gas source, the energy supply of the hydraulic oil dirt. Gas source, the hydraulic pressure source is the energy source of the control valve operation. Instrument with compressed air, the impurities contained in the hydraulic oil can clog the orifice and piping, resulting in failure. Accordingly, periodic inspection of the gas source, hydraulic oil, sewage is very important on the filter means on a regular basis.
5 gear transmission check. Counterparty wheel mechanism, electric actuators and hydraulic actuators gear drives should be regularly checked lubricant to prevent bite card phenomenon. Should check that the brake and limit device is flexible and easy to use.
6 stuffing checked. Should check the packing wear and compaction force to replace the stuffing box on a regular basis to ensure that the filler to a seal at the same time, to reduce the force of friction mouth. Lubricating oil of an oil-free stuffing box should not be added.
7 safe operation of the inspection. Check the safe operation of the control valves and accessories used in explosive hazardous locations, closures are tightened, the operation of the barrier, such as power supply, control valves and related accessories to ensure safe operation.pneumatic fitting
8. Transport and storage. Control valve during transport and storage, application-specific bracket to prevent loosening; installed on the control valve accessories, such as positioners, hand wheel should be solid, should prevent feedback lever connected to the control valve and other components by external forces injury; connection interface applications plastic film envelope, to prevent the intrusion of foreign objects; control valve connector can be used to seal the mating flange and blind plate can also be used sticky paper seal, to prevent the intrusion of foreign objects. Transport should be the installation of a strong wooden cases, and to take harsh wind and sand proof, rain and dust transport environmental conditions. The environmental conditions of transport and storage should meet the product specification requirements.3 way air valve