The core problem of compressor oper
Do you know the selection criteria of electronic valves for cold storage systems
In the cold storage refrigeration system, the selection of components must strictly abide by the four basic principles of safety, reliability, applicability and economy. Of course, solenoid valves are no exception. In addition, the solenoid valve must be further selected according to the on-site working conditions of the system. Generally judged from the following six aspects. Let me introduce you one by one.
1. According to the parameters such as the diameter of the refrigeration system pipes, select the specifications of the solenoid valve and the interface method, etc.
1. Judge the specific size of the solenoid valve diameter according to the internal strength and flow rate of the pipe used in the refrigeration system;
2. Same as above, select the specific interface method according to the specific situation: Under normal circumstances, if the solenoid valve interface diameter is greater than 50, the flange interface is selected, and when the solenoid valve is less than or equal to 50mm, it can be freely selected according to the specific situation;
2. The selection of solenoid valve material and temperature is generally determined according to fluid parameters
1. Corrosive fluid: Generally, the more scientific approach to this fluid is that the solenoid valve needs a corrosive solenoid valve. Generally choose the solenoid valve made of stainless steel;
2. High temperature fluid: The main consideration is that the solenoid valve needs to use high temperature resistant materials. In addition, it is necessary to choose the piston type structure type;
3. Fluid state requirements for solenoid valve selection: general fluids are roughly in gas, liquid or gas-liquid mixed state, especially when the diameter is greater than 25mm, you must pay attention to the distinction;
4. Different fluid viscosity requirements for solenoid valves: If the viscosity of the fluid is higher than a certain range, a solenoid valve with high viscosity should be selected.
3. When choosing the principle and structure of the solenoid valve, the decision must be made according to the pressure parameters of the system
1. Choose according to the nominal pressure of the pipeline: the parameter of nominal pressure is the same as other valves, mainly according to the pressure of the refrigeration pipeline;
2. Working pressure: Different solenoid valves are selected according to the working pressure of the refrigeration system. When the pressure of the refrigeration system is relatively low, the solenoid valve with direct-acting or step-by-step direct-acting working principle is generally used.
4. Judge the selection method of solenoid valve according to the working time of the refrigeration system
1. If the refrigeration system works for a long time, the simple understanding is that the working time is greater than the closed time, then the normally open solenoid valve is generally selected;
2. If the refrigeration system is opened for a short time, the normally closed type should be selected;
3. For some special working conditions, choose the long-term power-on type
5. Choose the type of solenoid valve according to the specific working environment of the refrigeration system of the freezer
1. If it is in some special environment such as explosive environment, you should choose solenoid valve with explosion-proof grade;
2. If there may be reverse flow in the refrigeration system, a solenoid valve with a non-return function should be required;
3. If the solenoid valve needs manual control, select the solenoid valve with manual function;
4. If you need to work in an environment with high moisture content, you must have a waterproof level;
