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When the high voltage solenoid valve encounters high temperature, seal, valve body, valve seat, spring, spool or..., if the standard high pressure solenoid valve is suddenly used under high temperature conditions, who is the most injured? Today, it is mainly our Ruwei engineers to discuss what are the core components that high voltage and high temperature conditions affect performance?

The main bearing body that acts on the high temperature and high pressure of the solenoid valve is the valve body. The valve body is similar to the liquid storage tank. Therefore, when designing and selecting, focus on the high temperature, high pressure and cavitation conditions. Pressure resistance, high temperature resistance strength characteristics, but also to ensure that the water heater solenoid valve medium flowing in the valve cavity has a sufficiently low pressure drop and heat loss.

The spool is the execution load that controls the switching action of the high-temperature solenoid valve. When the spool moves upward, the flow passage will immediately open, and when the spool moves downward, the flow passage will immediately close. As the core component of the solenoid valve, the valve core should have high hardness and rigidity, and those who excel in high temperature resistance, corrosion resistance, wear resistance, thermal stability, and low thermal expansion coefficient are the first choice.

There is a high temperature instant at the inlet of the solenoid valve. The first impact is the sealing valve core. The temperature rises faster than the valve body and the piston. At the moment of charging, there is a large temperature difference between the two. According to the Shanghai Ruwei Valve Research Institute Thermal imaging shows that the temperature rise of the valve core is 20%~30% higher than that of the piston, the piston rises 15%~20%, the piston rises about 20%, and the piston rises about 20%. Therefore, the fit clearance between the valve core, piston, and valve cavity is very important.

In our laboratory, Hastelloy or Monel alloy with a small thermal expansion coefficient (thermal expansion coefficient 7.5×10-8m/K) is used as a sealed connection accessory. The reliability and reliability of the sealed connection are very important. The reserved gap can meet the thermal expansion value of the valve core and the valve cavity due to the temperature rise, so as to ensure that a certain degree of coordination can be maintained after the heating reaches a stable state.

Because the spool of the solenoid valve has a circular structure, the lateral and radial pressures of the solenoid valve of the gas stove (including the vertical axial force on the slope) are symmetrical, so the spool has no pressure in the horizontal direction (when the solenoid valve is installed horizontally). difference. The position where the pressure difference occurs is in the valve cavity. The pressure difference caused by the unequal pressure acting on the main and auxiliary valve cups mainly acts on the upper and lower sides of the axial direction. The pressure difference between the main and auxiliary valve cups is similar to the inlet and outlet pressure differences. It is more common in 10KPa~400KPa.