What Are The Daily Inspection And Maintenance Of The Straight Stroke Regulating Valve

1. Relieve stress. Various stresses due to improper installation or combination. For example, the high temperature medium produces thermal stress, and the unbalanced tightening force during installation causes stress, etc. The unbalanced stress acts on the regulating valve, which deforms the valve stem and guide member of the regulating valve, cannot be correctly aligned with the valve seat, causes leakage, and increases the variation, etc. Therefore, stress relief maintenance work should be carried out in daily maintenance.

2. Remove rust and dirt. Frequently check whether there is rust, welding slag, dirt, etc. in the connecting pipeline of the regulating valve, and remove it in time after discovery. Because these dirt will cause the wear of the valve core and valve seat of the regulating valve, which will affect the normal operation of the regulating valve. Usually, filter devices such as filters can be installed in front of the regulating valve and cleaned regularly.

3. Check the valve support. The regulating valve support keeps the various parts of the regulating valve in a position that is not affected by gravity and the like. Improper support will cause the valve stem and valve seat of the regulating valve to be out of alignment, which will increase the variation and reduce the sealing performance. Therefore, it should be checked whether the regulating valve support is suitable.

4. Remove the pollutants that supply energy such as air source and hydraulic oil. The air source and hydraulic source are the energy sources for the operation of the regulating valve. The impurities contained in the compressed air and hydraulic oil used for the instrument will block the orifice and pipeline and cause failure. Therefore, it is very important to regularly check the air source, hydraulic oil, and regularly discharge the filter device.

5. Inspection of gear transmission. The gear transmission of the handwheel mechanism, electric actuator and hydraulic actuator should be checked regularly, and lubricant should be added to prevent the occurrence of jamming. It should be checked whether the brake and limit device are flexible and easy to use.

6. Check the stuffing box. The wear and compression force of the packing should be checked, and the stuffing box should be replaced regularly to ensure that the packing can seal and reduce the shadow of its friction. Lubricating oil should not be added to stuffing boxes that are not lubricated with oil.

7. Inspection of safe operation. For the control valve and related accessories used in explosive hazardous places, check their safe operation, such as whether the sealing cover is tightened, the operation of the safety barrier, the power supply, etc., to ensure that the control valve and related accessories can operate safely.

8. Transportation and storage. During transportation and storage, the control valve should be fixed with special brackets to prevent loosening; the relevant accessories installed on the control valve, such as valve positioner, handwheel mechanism, etc., should be firm, and the feedback rods connected to the control valve should be prevented from external force. damage; each connection interface should be covered with plastic film to prevent the intrusion of foreign objects; the connection port of the control valve can be sealed with matching flange and blind plate, or can be sealed with adhesive paper to prevent the intrusion of foreign objects. During transportation, a solid wooden box should be installed, and the impact of harsh transportation environmental conditions such as wind, sand, rain and dust should be adopted. The environmental conditions for transportation and storage should meet the requirements of the product specification.