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You may also have encountered the problem of increasing the water pressure of the package, i.e. a situation where the needle of the pressure gauge (manometer) shows a number greater than 3. In this case, it is necessary to check the operation of the safety valve of the package. Safety valves have a protective function. In fact, they adjust the pressure of the package and when the pressure of the fluid entering them rises above a certain value, it operates automatically and their valve is opened and by draining the fluid, it brings the pressure to the standard level and avoids risks such as perforation of the closed tanks. prevent Finally, when the pressure reaches a level lower than the maximum pressure of the safety valve used, it closes again. If you are interested in what the package safety valve is and what it is used for, stay with us.
How the package safety valve works
The safety valve in each air heater is designed according to the pressure of that system and does not allow the pressure of the system to exceed a certain value. Package safety valve is also called triple safety valve. The reason for this name is that when the pressure of the package reaches more than three bars (Bar), the safety valve is responsible for bringing the pressure to the normal level.
The safety valve consists of 3 parts: disc, spring and nozzle. When the internal water pressure of the package increases, pressure is applied to the nozzle inside the valve, and then the spring opens too much and leads the disk up until the outlet of the safety valve is opened, and until the pressure reaches the normal level, additional water It comes out of it. Excess water pressure can occur in a variety of situations, such as:
Excess water pressure filling the system
Fluid flow imbalance caused by unwanted closing or opening
Failure of heat exchanger tubes
Changes in ambient temperature
Application of package safety valve
The safety valve of the package is responsible for protecting the device against pressure increase. So, when the safety valve of the package is damaged and does not open against high pressure, it causes serious damage to the device.
Types of insurance packages
Package safety valve has various types, which we will examine each one below.
Spring-loaded safety valve: In the spring-loaded safety valve, the design of the spring is such that it presses the disc against the incoming flow, and when the pressure exceeds a certain amount, the spring opens and the disc is released, and the fluid flows into the valve.
Net weight safety valve: The net weight safety valve does not use a spring and with increasing pressure, the disk rises, the excess pressure is discharged and it is used for tanks with low pressure.
Safety valve with pilot: Safety valve with pilot consists of two parts, the main valve and the pilot valve. In this model, the pressure is adjusted by the pilot valve and it is used in high pressure tanks and for large valves, where a higher reliability factor is required.
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final word
Due to the high importance of the safety valve in regulating the pressure and security of the package, it is necessary to ensure the safety of this part. It is better to ask for help from the repairmen for specialized troubleshooting, repair or replacement of the valve in case of problems such as pressure increase in the package or water leakage from the valve. Also, if you want to get more information about different types of safety valves, call the temperature equipment group at 021-88822550 during office hours and get advice from the experts of the temperature equipment group.
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