What is the safety valve of the cold storage system? Wh […]
What is the safety valve of the cold storage system? What does it do? What are the precautions for the use of the safety valve in cold storage?
First of all, let's talk about the function of the safety valve. The function of the safety valve is to ensure the safe operation of the refrigeration system under a given pressure. It is generally installed at the high-pressure side of the compressor and bypasses the high and low-pressure parts if necessary to achieve high-pressure safety protection. ; Safety valves are also often installed on equipment such as condensers or accumulators to avoid excessive pressure in the container. The spring-type safety valve structure is commonly used in ammonia system refrigeration, when the system pressure exceeds the given pressure of the spring, the spring is compressed, the valve core of the safety valve is opened, and the high-pressure refrigerant is discharged. The given pressure of the safety valve is realized by adjusting the size of the spring force, which is related to the working conditions of the refrigeration system and the choice of refrigerant. Generally, the opening pressure of the safety valve in the high-pressure part of the refrigeration system of ammonia and fluorine is about 1.8MPa. The opening pressure of the safety valve of the low-pressure part such as the low-pressure circulation barrel, the drain barrel, the gas-liquid separator, etc. is about 1.8Mpa.
The safety valve on the refrigeration compressor is mostly spring type, and the take-off pressure difference is adjusted by adjusting the tightness of the spring. At present, the pressure difference of the safety valve of the single-stage compressor is adjusted to start at 1.6MPa and automatically close at 1.3MPa.
If the safety valve is not closed tightly, it should be disassembled or repaired until the sealing position can be closed. The safety valve is a high-pressure measuring instrument, which should be calibrated regularly by a special organization, and can be used only after passing the test. Finally, remind that the safety valve cannot be adjusted at will.
