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Use and maintenance of valves

Published on:

2021-09-15

1, the use and maintenance of electric control valve

With the rapid development of China's industry, Shanghai Yiling production of electric control valve in metallurgy, petrochemical and other fields of application more and more widely, its stability, reliability also becomes more and more important, its working condition of good or bad will directly affect the automatic control process, this article will elaborate the use and maintenance of electric control valve. New design, installation of the control system, in order to ensure that the control valve can work properly when driving, and make the system safe operation, the new valve before installation, should first check whether the valve on the nameplate mark with the design requirements. The following items should also be commissioned. Basic error limit; full stroke deviation; return difference; dead zone; leakage (performed when the requirements are strict occasions). If the regulating valve in the original system has been overhauled, in addition to the calibration of the above items, the old valve's stuffing box and connections and other parts should also be checked for tightness. out of the law

2, flange sealing and leakage seal processing method

Factors affecting the flange seal is multifaceted. Mainly: bolt preload; sealing surface type; gasket performance; flange stiffness; operating conditions. For decades, ANSI flanges designed by the American National Standards Institute have provided an applicable sealing technology for the oil and gas industry, and it has been effective. However, as the needs of the oil and gas industry have changed, the shortcomings of ANSI flanges continue to be exposed. The principles of cost effectiveness, environmental protection, and optimal health and safety assurance are what operators and contractors are facing in the 21st century.

3, butterfly valve test and installation and troubleshooting methods

I. Test and Adjustment 1、The butterfly valve produced by Shanghai Yiling, whether manual, pneumatic, hydraulic, electric components are strictly debugged before leaving the factory, the user should fix both sides of the import and export evenly, close the disc valve, apply pressure to the inlet side, observe any leakage on the outlet side, and open the disc plate to prevent damage to the sealing sub before the strength test is conducted in the pipeline. 2、This product is strictly checked and experimented before leaving the factory, but there are individual products in transit automatic screw dislocation, need to readjust, pneumatic, hydraulic, etc., please read the manual of the supporting drive device. 3, electric drive disc valve factory has been adjusted to the control mechanism of the opening and closing stroke. In order to prevent the power supply is the wrong direction, the user in the first time after the power supply, first open the manual to half open position, in the electric switch to check the direction of the indicator disc and the valve closed direction can be consistent. From: Shanghai Yiling Industrial Co.

4、The cause of leakage of pressure reducing valve

As an important component of hydraulic system, the main function of pressure reducing valve produced by Shanghai Yiling is to make the outlet pressure of the system always at a level lower than the inlet pressure, to keep the outlet pressure of the system stable, and the outlet pressure of the system is not affected by the fluctuation of inlet pressure and flow; however, once the sealing surface of pressure reducing valve leaks, it not only affects the normal production, but also causes the loss of hydraulic oil and pollutes the environment; in marine In the hydraulic system, the pressure reducing valve as the main control element, the importance of its sealing is not to be underestimated. After joint research and analysis with relevant experts, it is found that the seal between the connecting sleeve and valve body of pressure reducing valve mainly relies on the O-ring between the connecting sleeve and the inner wall of the valve body for circumferential sealing, and once the seal is effective, its external leakage is inevitable.