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    The principle, installation and use of the bypass valve of the heater of the cold dryer Composition and principle of "heater bypass"

    The principle, installation and use of the bypass valve of the heater of the cold dryer Composition and principle of "heater bypass" The energy regulation of the system is generally composed of the following ways: Compressor parallel-multi-stage control; Variable speed compressor frequency conversion, etc.; Compressor with unloading device; Hot gas bypass For compressors without their own energy regulating device For refrigeration systems, it is very economical to use hot gas bypass to regulate the energy of the system. General adjustment range: 0?0.55MPa (0?80psig); Safe operating pressure-2.75MPa (400psig). Hot gas bypass is a mechanical device that uses the balance of refrigerant pressure and spring force to control valve inlet/outlet pressure. The hot gas bypass valve as an energy regulator can provide a means to keep the system working properly at a given minimum suction pressure by bypassing the high-pressure refrigerant to the low-pressure side of the system. The main function of the hot gas bypass valve: Provide a virtual load; Coil defrost; Use the evaporator as a mixing chamber. Main advantages of hot gas bypass valve: Prevent compressor short circuit cycle; Fangzhi compressor works under very low suction pressure; Prevent the evaporator from freezing at low load; Minimize system components; 02 Specific installation method: Cut the compressor discharge pipe and install a T-joint: For systems where the hot gas is bypassed to the evaporator, cut the line between the thermal expansion valve and the evaporator and install a T-connector. If a distributor is installed at the inlet of the evaporator, the T-joint should be installed between the thermal expansion valve and the distributor. For the system where the hot gas is bypassed to the evaporator, in order to minimize the pressure drop of the pipeline, the length of the pipeline is compressed as much as possible. The system by which the heat gas is bypassed to the evaporator. For the system by which the heat gas is bypassed to the suction tube, the suction tube is cut open and a bypass channel is installed. Bypass channel should be 45& amp;deg; angle with the direction of the fluid in the suction tube, so that the bypass gas can be fully mixed with the gas in the suction tube. Because the direct bypass of the hot air to the suction tube will cause the suction overheating of the semi-closed or fully closed compressor, which will cause the motor overheating. Therefore, it is recommended to install a spray device in the system of hot air bypass to suction pipe to cool the bypass heat. The hot air bypass to the suction pipe system cuts the appropriate length of the bypass pipe to install the hot air bypass valve: For the system of bypass to evaporator, if the hot air bypass valve is installed near the T shape connection near the evaporator, it is necessary to ensure that the outlet line of the hot air bypass valve flows freely towards the compressor direction. If the hot air bypass valve is installed near the compressor, the pipeline should flow freely towards the shape of the evaporator. as the hot air bypass passes to the suction tube, the inlet of the hot air bypass valve shall flow freely towards the compressor direction and the T bifurcation on the suction tube shall be located at the top of the suction tube. 03 Hot Air Bypass Valve The main function of the hot air bypass valve is to prevent suction pressure from falling below a desired set value, thereby balancing the cooling of the system. Therefore, the first step after the installation of the hot air bypass valve is to determine the minimum suction pressure under the working conditions used as the setting point of the hot air bypass valve. (1) Start the system and determine whether it is functioning properly. Install a pressure gauge on the compressor suction tube and measure the suction pressure after the system is stabilized. If the temperature of the outlet line is high, the hvacrbk] will indicate that there is a hot air bypass. (2) Prevent hot air from passing by. the power supply of the solenoid valve in the hot air bypass pipeline can be cut off or the adjusting rod can be adjusted to make the hot air bypass valve in a completely closed state. (3) Reduce the load of the evaporator until the suction pressure is reduced to the set point where the hot air bypass is required. The load of the evaporator can be reduced by closing the outlet, covering the evaporator, reducing the flow rate of the air, the fan, and closing the bypass water of the water cooler. (4) Ensure that the solenoid valve of the hot air bypass line is open at this time. (5) The regulating rod of the hot air bypass valve. Make the hot air bypass valve start bypassing the hot air until the suction pressure no longer drops and maintains at the expected value. (6) The regulation mode of the hot air bypass valve: the adjusting rod clockwise will increase the pressure setting value; the adjusting rod counterclockwise will reduce the pressure setting value; and the adjustment should be slow and small in order to make the system run stably after each circle adjustment. 04 Attention (1) For parallel evaporator systems, the heat bypass flux shall not be greater than the refrigerating capacity of a single evaporator and shall be controlled by a multi-channel heat bypass valve. (2) If the compressor is located in the upper part of the evaporator, it is necessary to ensure that the compressor has sufficient return oil under the condition of low load side flux. (3) When bypassing the evaporator, if the bypass line is longer, the bypass pipe shall be insulated and insulated. (4) Do not break down integral hot air bypass valves. When welding, wrap the body with wet cloth or cold iron to prevent the body from overheating.

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