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The role of safety valves, fusible plugs, and emergency ammonia vents in walk-in cooler
author: supermarket refrigerated showcase category: walk-in display coolers Views: 524Time: 2016-08-22
The role of safety valves, fusible plugs, and emergency ammonia vents in walk-in cooler
Safety valves, fusible plugs, and fusible plugs in walk-in cooler In order to prevent the refrigeration device from damaging the equipment due to the excessive pressure of the emergency ammonia discharge device, a safety valve or fusible plug is generally installed in the refrigeration system at a higher pressure part.
(1) Safety valve Safety valve is a safety protection element in the walk-in cooler refrigeration system. Its function is to automatically open and release the system pressure when an accident occurs in the system (such as abnormal pressure, etc.) to protect the refrigeration device and personnel safety . The safety valve is generally installed on the high-pressure end of the compressor, bypassing the high and low-pressure parts when necessary to achieve high-pressure safety protection. Safety valves are also often installed on equipment such as condensers or reservoirs to avoid excessive pressure in the container. The opening pressure of the safety valve is 1.6MPa for R12 devices and 1.8MPa for R22 and R717 devices. All safety valves must be inspected and sealed before installation, and should not be unsealed or adjusted during use.
(2) Fusible plugs Fusible plugs are mainly used for freon refrigeration equipment or pressure vessels with a small volume. It is a simple safety device that replaces safety valves. Fusible plugs contain fusible alloys, and the melting point of the alloy is generally below 75°C. Working principle: When the pressure of the pressure vessel is too high, the temperature in the vessel will also rise at the same time. Once the melting point temperature of the fusible plug alloy is exceeded, the fusible alloy will melt immediately, and the refrigerant in the compressed walk-in cooler equipment It will be released from the place where the fusible plug is installed to the atmosphere, thereby reducing equipment pressure and protecting equipment and personal safety. Fusible plugs are generally installed on the top of the equipment and are disposable protection devices.
(3) Emergency Ammonia Drain The emergency ammonia drain is mainly used for the safety protection of large and medium-sized ammonia refrigeration systems, and is an emergency emergency equipment. In order to prevent the refrigeration equipment from exploding in the event of an accident, connect the container with a large amount of ammonia in the refrigeration system (such as ammonia storage, evaporator) with the emergency ammonia discharge device. When the situation is urgent, walk-in cooler The liquid ammonia discharge valve of the emergency ammonia discharge device and the tap water valve leading to the emergency ammonia discharge device are opened to discharge the liquid ammonia. It is formed by welding two seamless steel pipes with different diameters together. The side of the small-diameter seamless steel pipe extending into the large-diameter shell is provided with many small liquid outlet holes. There is a water pipe connected to the shell on the side of the shell. When ammonia is discharged urgently, a large amount of water is sprayed into the lateral water pipe, which will cause the small liquid to flow. The liquid ammonia sprayed from the hole is dissolved in water, and the solution is put into the sewer from the outlet.
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