Solenoid Valves purchase method
When buying any of the same items, we all hope that the items we choose are content, suitable for ourselves. What is needed. Then the same is true when purchasing solenoid valves. We all hope that the solenoid valves we have chosen are all suitable. So how do we choose the right solenoid valve? The selection of solenoid valves should first follow the four principles of safety, reliability, applicability and economy.
1, select solenoid valve according to pipeline parameters: diameter specification (ie DN), interface mode 1. Determine the diameter (DN) size according to the internal pipe size or flow requirement of the pipeline; 2. Interface mode, general > DN50 should choose flange interface, ≤ DN50 can be freely selected according to user needs.
2, select solenoid valves based on fluid parameters: material, temperature group 1. Corrosive fluid: Corrosion-resistant solenoid valve and all stainless steel should be used; edible ultra-clean fluid: food grade stainless steel solenoid valve should be used; 2. High temperature fluid: It is necessary to select a solenoid valve made of high temperature resistant electrical materials and sealing materials, and to select the type of piston structure; 3. Fluid state: large to a gaseous state, liquid or mixed state, especially when the diameter is larger than DN25, it must be distinguished; 4. Fluid viscosity: Usually it can be arbitrarily selected below 50cSt. If it exceeds this value, high viscosity solenoid valve should be used.
3, Select Solenoid Valves Based on Pressure Parameters: Principles and Structures 1. Nominal pressure: This parameter has the same meaning as other general-purpose valves, and is determined according to the nominal pressure of the pipeline; 2. Working pressure: If the working pressure is low, the direct-acting or step-by-step direct-acting principle must be used; when the minimum working pressure difference is above 0.04Mpa, direct-acting, step-by-step direct-acting or pilot-operated can be used.
4, electrical selection: voltage specifications should be preferred to use AC220V, DC24 is more convenient.
5, depending on the length of work time: normally closed, normally open, or sustainable 1. When the solenoid valve needs to be opened for a long time, and the duration is longer than the closing time, the normally open type should be selected; 2. If the opening time is short or the opening and closing time is not much, then the normally closed type is selected; 3. However, some working conditions for safety protection, such as furnace and kiln flame monitoring, can not be selected for normal opening, and should be selected for long-term energization type.
6, select auxiliary functions according to environmental requirements: explosion-proof, non-return, manual, waterproof fog, water shower, diving.
Source (Solenoid Valves) www.zograjd.com
