Selection of Electromagnetic Reversing Valve in Hydraulic System

Solenoid reversing valve is selected according to what? The following author will give you a detailed talk about the basis for the selection of electromagnetic reversing valves.

The selection of electromagnetic reversing valve should firstly follow the four principles of safety, reliability, applicability and economy, and then according to the six aspects of on-site working conditions (namely, pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action parameters, etc.) mode, special requirements to choose).

Selection basis:

1. Select the solenoid valve according to the pipeline parameters: diameter specification (ie DN), interface mode

（1) Determine the diameter (DN) size according to the inner diameter size or flow requirements of the on-site pipeline;

（2) Interface mode, generally > DN50 should choose flange interface, ≤ DN50 can be freely selected according to user needs.

2. Select the solenoid valve according to the fluid parameters: material, temperature group

（1) Corrosive fluids: corrosion-resistant solenoid valves and all stainless steel should be used; edible ultra-clean fluids: food-grade stainless steel solenoid valves should be used;

（2) High-temperature fluid: Choose a solenoid valve made of high-temperature-resistant electrical materials and sealing materials, and choose a piston-type structure;

（3) Fluid state: as large as gaseous state, liquid state or mixed state, especially when the caliber is larger than DN25, it must be distinguished;

（4) Fluid viscosity: Usually, it can be selected arbitrarily below 50cSt. If it exceeds this value, a high-viscosity solenoid valve should be selected；

3. 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 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, and pilot-operated types can be selected；

4. Electrical selection of electromagnetic reversing valve: AC220V and DC24 should be preferred for voltage specifications as much as possible.

5. Choose according to the length of continuous working time: normally closed, normally open, or continuous power on.

（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 long, choose the normally closed type;

（3) However, for some working conditions used for safety protection, such as furnace and cellar flame monitoring, the normally open type cannot be selected, and the long-term energized type should be selected；

6. Select auxiliary functions according to environmental requirements: explosion-proof, check, manual, waterproof fog, water shower, diving Explosive environments: solenoid valves with corresponding explosion-proof grades must be selected；