Supermarket refrigerated showcase (library) Safe operation of valves during system use
(1) supermarket refrigerated showcase (library) In the case of compressor startup, warehouse purchase and cooling, frosting and decompression, etc., the return steam valve should be opened slowly Turn on slowly, and pay attention to the sound of refrigeration. It is forbidden to open suddenly to prevent excessive humidity from rushing into the compressor and causing accidents. (2) When opening the general shut-off valve, in order to prevent the valve core from getting stuck in the valve body, it is required to turn the handwheel when it is close to full opening, not too fast, and when the foot is opened, the handwheel should be reversed for about 1/8 circles. (3) When opening the expansion valve, open the expansion valve first, such as 1/3 or 1/2 turns, and then reduce it to the required opening degree of 1/4, 1/6, 1/8 turns, etc. This can prevent the phenomenon that the cold room is not supplied with liquid or the amount of liquid is too small when the valve core cannot be opened due to a loop or is blocked by dirt. (4) Safe operation of liquid pipe valves When operating liquid pipe valves, it is strictly forbidden to close the valves at both ends of the liquid pipe at the same time, otherwise it will cause the liquid in the pipe to generate high pressure due to the rise in temperature, making the steel pipe or the weld unbearable And burst ' generally called liquid burst , especially low-pressure liquid pipes that do not move for a long time, should be paid more attention in summer. The correct operation is: First, when you need to close the valves at both ends of the liquid pipe, you should first close the valve at one end, and then drain the liquid in the pipe before closing the valve at the other end. The second is that most liquid pipe valves only close one end of the valve, and the other end of the valve should be open when it is connected to the equipment. (5) The angle valve of the glass tube indicator should always be fully open. It should be switched on and off once a month or so to test its flexibility. When opening the valve, open the gas valve first, then the liquid valve; when closing, close the liquid valve first, and then the gas valve. The purpose of this inspection is that once a glass tube burst accident occurs, the steel ball in the valve automatically closes with the sealing surface in the valve seat due to the pressure difference between the equipment and the outside to prevent a large amount of ammonia from running out. Since the valve is closed flexibly, the valve can be quickly closed when ammonia is run, so that the accident can be quickly eliminated. (six) refrigeration equipment — — supermarket reThe shut-off valve in front of the safety valve on the frigerated showcase (library) can only be closed when the safety valve is replaced. The safety valve is even more dragging to open this valve. It is forbidden to close this valve at ordinary times to prevent excessive pressure in the equipment from causing accidents that damage the equipment. (7) When the system is running, the condensation pressure of the ammonia working fluid shall not be higher than 1.5MPa. If it exceeds this pressure, the machine should be shut down. Find the reason, take measures, and then start the machine after the pressure drops to a safe range. When the system is running, the liquid level of the high-pressure liquid tank should not be higher than 80%. If it is too high, it should be dealt with in time. (8) The pressure reducing valve on the air release device and the oil collector should be in a normally open state to prevent the pressure in the container from being too high and unsafe accidents. (9) In winter, when machinery and equipment stop running, the water in it should be drained to avoid freezing damage to machinery and equipment. (Ten) When the low-pressure equipment is out of service regularly, the ammonia from the low-pressure equipment should be pumped into the high-pressure equipment for storage, and the low-pressure equipment should be kept at a pressure of 0.03-0.05MPa. (11) During the period of non-use of the intercooler, the pressure shall not exceed 0.5MPa. If the pressure is too high, it should be drained and reduced. (12) Valves that have not been opened and closed for a long time should be regularly opened and closed to check flexibility ' once an accident occurs, the valve can be opened or closed flexibly and in time to reduce accident losses. (thirteen) The various spare valves, ammonia valves, sewage valves, etc. in the supermarket refrigerated showcase (library) should be closed before removing the handwheel or adding lead seals. The pipe head that is connected to the atmosphere should be capped to prevent accidents caused by accidental opening of the valve.
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