How to check the flow control valves daily?

Stress relief. There are various kinds of stresses caused by improper assembly or collocation. For example, thermal stresses caused by high temperature substances, and stresses caused by unbalanced tightening forces during assembly. The unbalance of fastening force causes stress, etc. Stress imbalance effect on the self-regulating valve, so that the self-regulating valve seat, guide parts deformation, not properly aligned with the valve seat leading to leakage, down to expand, etc.. Thus, in the daily maintenance should be carried out to remove the stress of the maintenance work.

Clean up rust and dirt. Always check whether there is rust, weld scars, dirt, etc. in the coupling pipeline of the self-operated control valve, which should be eliminated immediately after discovery. Because of this dirt will lead to self-operated regulating valve heart and seat damage, endangering the normal operation of the self-operated regulating valve. In general, you can modify the filtering system such as strainer from the front of the self-regulating valve, and clean it on time.

Check the cartridge check valve support point. Self-operated regulating valve support point so that the self-operated regulating valve parts in the parts that will not be subject to forces and other hazards. If the support point is unreasonable will lead to self-operated regulating valve seat and seat can not be aligned, so that the decline in expansion, sealing characteristics reduced. Therefore, the self-operated regulating valve support point should be checked to see if it is suitable.

Eliminate the pneumatic valve, gear oil and other dirt that provides electric energy. Pneumatic valve, hydraulic machine source is the source of energy for the operation of the oil pump check valve. Instrument air compression, gear oil often contains residue can block the throttle valve hole and pipeline, leading to common failures. Thus, regular maintenance of pneumatic valves, gear oil, on time to the filter to carry out sewage treatment is very critical.

Checking of safety operation. Self-operated control valves and related accessories used in flammable and explosive risk sites should be checked for safety operation such as whether the cover is twisted, the operation of the safety grating, power supply conditions, etc., to ensure that self-operated control valves and related accessories can operate safely.

Delivery and storage. Self-operated regulating valve in the delivery and storage period, the use of special type support frame fixed immobile, to avoid loosening; assembled in the self-operated regulating valve in the relevant accessories, such as valve positioner, spindle organization, etc. should be strong, should avoid and self-operated regulating valve coupled with the opinion of feedback rod and other components suffer damage from external forces; each access socket using plastic film cover seal, to avoid the intrusion of external factors; self-operated regulating valve connection port can Use supporting facilities flange and blind valve sealability, can also choose sticky paper sealability, to avoid the invasion of external factors.