Introduce the diagnosis and handling of ATOS solenoid valve fault information separately

The safety factor of ATOS solenoid valves has long been highly valued at all levels, and the safety instrument system software (SIS) for self regulating valves has increasingly specified control valves, mainly manifested in the following aspects.

① The diagnosis and resolution regulations for common faults in ATOS solenoid valves have been improved, which requires not only passive maintenance and upkeep of control valves after common faults occur, but also protective and proactive maintenance and upkeep before common faults occur. Therefore, it is increasingly crucial to conduct statistical analysis and dissection of the relevant components that make up the control valve, and to immediately propose maintenance and upkeep suggestions for the steam regulating valve.

② For control valves used in emergency braking system software or safety interlock system software, clear provisions shall be made for immediate, reliable, and safe posture. This type of control valve can reflect agility.

It can be conducted based on some tests, and the results obtained from the tests can also be summarized to meet the specifications for the leakage of pneumatic control valves. The standard test for leakage of pneumatic regulating valves must first test the pressure of the medium. For example, the pressure of the regulating valve should be 3.5kg/cm?

When the allowable pressure difference of ATOS solenoid valve is less than 3.5kg/cm? This is the required allowable pressure difference. The testing medium should be a clean liquid (water or gasoline) and a vapor (gas or N2) at 10-50 ℃. Due to different working conditions, incorrect differences may occur when testing other media. Therefore, it is proposed to use the medium for testing. When testing the medium, it should flow into the valve according to the requirements. The valve inlet and outlet can directly reach the air or connect to the measuring equipment that is damaged by the bottom pressure of the air. When it is clear that a part of the connecting pipeline below the gate valve is filled with the medium, the leakage value of the regulating valve can be measured at this moment.

How to test for leakage of ATOS solenoid valve?

When testing the ATOS solenoid valve structure, a certain amount of data signal pressure should be added to the actuator, and the valve must be adjusted to the closed state. During testing, for pneumatic actuators, the processing methods for air opening and non closing are different. If the data signal pressure for air opening actuators is zero, the model specification pressure for air closing actuators should be the lower limit pressure value with fewer pressure restrictions than the input larger data signal pressure. When testing the actuator used for a disconnect type pressure regulating valve, the data signal pressure of the actuator should be the pressure required by the design scheme.

Compressed into a power device, with the cylinder as the electric actuator, the valve is driven by accessories such as electric valve locator, converter, relay, and holding valve to complete switch quantity and proportional adjustment. It receives manipulation data signals from the industrial production fully automatic control system and adjusts the pipeline material. Due to its structural type, pressure tests must be conducted on the valve section and the electric actuator section during pressure testing. A lot of pressure tests and statistical analysis of test record data information have been conducted on pneumatic control valves, and it has been found that about 50% of control valves have production issues.

ATOS solenoid valve arrangement exceeds the standard, and gate valve compressive strength does not meet the standard on three levels. The leakage test of pneumatic control valve uses clean water as the test substance, with a test pressure of 0.35MPa. When the allowable pressure difference of the valve is below 0.35MPa, it should be the standard value in the design scheme document. During the experiment, the pneumatic data signal pressure of the air opening regulating valve should be zero. The data signal pressure of the ATOS solenoid valve should be the upper limit value of the input data signal plus 20kPa. The data signal pressure of the disconnecting regulating valve should be the standard value in the design scheme document. When the test pressure is the pressure difference during the operation of the gate valve, the data signal pressure of the actuator should be the standard value in the design scheme document. Before applying pneumatic control valves, conducting pressure tests is a necessary task.

The compressive strength test and sealing test of ATOS solenoid valve plate can not only determine the characteristics of the pneumatic control valve, but also fully exert its effectiveness in all normal operations in the future production process, ensuring the normal operation of the company's production and manufacturing.

The quantity parameters on the process side are single, only temperature parameters. No need to measure flow and pressure. This is because indoor temperature is only related to the average temperature of the water supply and condensate. It is independent of the size of the water flow. Therefore, fewer testing equipment is required and the adjustment cost is relatively low.

However, the temperature regulation method of self operated pressure regulating valves also has obvious disadvantages: due to the large thermal inertia of the heating system, temperature changes are significantly delayed. Adjusting the system flow rate can slow down temperature changes in the system, which may take between 1 hour and several hours. The temperature remains stable under new conditions. Therefore, temperature measurement is usually a transitional value that cannot truly reflect the actual effect of regulation. The larger the heating system, the more obvious the defect. To overcome the above drawbacks, it is usually necessary to conduct testing after the system has stabilized, which results in slower coordination time. This adjustment method adds new defects.

That is, the temperature regulation method of ATOS solenoid valve is applicable to the following three situations

(1) The ATOS solenoid valve heating system has a small scale and no significant temperature hysteresis.

(2) In the ATOS solenoid valve heating system, when the user's return water temperature is automatically detected by the computer, it can be fine tuned through simulation analysis methods and simulation resistance methods.

(3) The ATOS solenoid valve computer automatically adjusts the flow rate for control. The adjusted parameters are water temperature and flow rate. Continuously monitor the average temperature of the water supply and return during the adjustment process. Or return the temperature and compare it with the reference temperature, and the computer will analyze and calculate the overall operating condition of the heating system. The temperature deviation obtained by comparing with the reference temperature is converted into the adjusted opening of the electric control valve. The computer command adjusts the electric control valve to the necessary opening. Water temperature can be continuously monitored every few minutes. The flow rate can be adjusted once per hour (through an electric control valve). This sampling control only corresponds to the large hysteresis of the heating system. Gender. The household centralized heating system adopts this method to automatically adjust and control the flow rate on the computer. The return water deviation of 23 thermal power stations can be controlled within 1.0C, which is the average room temperature heating effect of heat demanders.