Electromagnetic valve selection attention four or six principles introduction

Solenoid valve selection should first follow the four principles of safety, reliability, applicability and economy, followed by six aspects of field conditions (ie pipeline parameters, fluid parameters, pressure parameters, electrical parameters, modes of operation, Special requirements are selected).
    Selection basis:
    First, select the solenoid valve according to the pipeline parameters: the diameter specification (ie DN), interface mode
    1. Determine the diameter (DN) size according to the inner diameter of the pipeline or the flow requirement.
    2, interface mode, general > DN50 to choose the flange interface, ≤ DN50 can be freely selected according to user needs.
    Second, according to the fluid parameters to select the solenoid valve: material, temperature group
    1, corrosive fluid: should choose corrosion-resistant solenoid valve and all stainless steel; edible ultra-clean fluid: food grade stainless steel solenoid valve should be used.
    2, high temperature fluid: to choose the use of high temperature resistant electrical materials and sealing materials made of solenoid valves, and to choose the type of piston structure.
    3, the fluid state: large to a gaseous state, liquid or mixed state, especially when the caliber is larger than DN25 when ordering must be distinguished.
    4, fluid viscosity: usually below 50cSt can be arbitrarily selected, if this value is exceeded, the high viscosity solenoid valve should be used.
    Third, select the solenoid valve according to the pressure parameters: principle and structure variety
    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.
    Fourth, electrical selection: voltage specifications should be preferred to use AC220V, DC24 is more convenient
    5. Choose according to the length of continuous working hours: normally closed, normally open, or continuously energized
    1. When the solenoid valve needs to be opened for a long time, and the duration of the excess closing time should be the normally open type.
    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, cannot be selected for normal opening.
    6. Select auxiliary functions according to environmental requirements: explosion-proof, non-return, manual, waterproof fog, water shower, diving;
    1. Explosive environment: The corresponding explosion-proof solenoid valve must be selected (our company has: dIIBT4, dIICT5, ExmI/IIT4).
    2. When the fluid in the pipe has a backflow phenomenon, you can choose our company's OK71-N and OK72-N series with non-return function solenoid valve.
    3. When it is necessary to carry out on-site manual operation of the solenoid valve, we can choose our company's OK71-S and OK72-S series with manual function solenoid valve.
    4. For outdoor installation or dusty occasions, waterproof and dustproof varieties should be used (protection level is above IP54).
    5. For the fountain, a submersible solenoid valve must be used (protection level is above IP68).