Selection criteria for MAC solenoid valve

The selection of MAC solenoid valves should first follow the four principles of safety, reliability, applicability, and economy. Secondly, the selection should be based on six aspects of on-site conditions (i.e. pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action mode, and special requirements).

Selection criteria for MAC solenoid valve：

1、 MAC solenoid valve selects solenoid valve based on pipeline parameters: diameter specification (i.e. DN), interface method

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

2) MAC solenoid valve interface method, generally>DN50, flange interface should be selected, and ≤ DN50 can be freely selected according to user needs.

2、 MAC solenoid valve selects solenoid valve based on fluid parameters: material, temperature group

1) Corrosive fluids: corrosion-resistant solenoid valves and all stainless steel should be selected; Edible ultra clean fluid: It is recommended to use food grade stainless steel solenoid valves;

2) High temperature fluid: It is necessary to choose electromagnetic valves made of high-temperature resistant electrical materials and sealing materials, and to choose piston type structures;

3) Fluid state: up to gaseous, liquid, or mixed state, especially when the diameter is greater than DN25, it must be distinguished;

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

3、 MAC solenoid valve selects solenoid valve based on pressure parameters: principle and structural variety

1) Nominal pressure: This parameter has the same meaning as other general valves and is determined based on the nominal pressure of the pipeline;

2) Work pressure: If the work pressure is low, the principle of direct action or step-by-step direct action must be selected; When the working pressure difference is above 0.04Mpa, direct acting, step-by-step direct acting, and pilot operated can all be selected.

4Electrical selection: The voltage specifications should preferably be AC220V or DC24, which are more convenient.

5Choose based on the duration of continuous work: normally closed, normally open, or continuously powered on

1) When the solenoid valve needs to be opened for a long time and the duration exceeds 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 kiln flame monitoring, the normally open type cannot be selected, and the long-term electrified type should be selected.

6、 MAC solenoid valve selects auxiliary functions according to environmental requirements: explosion-proof, check, manual, waterproof fog, water spray, and diving.

Selection principles for MAC solenoid valves

Safety of MAC solenoid valve:

1. Corrosive media: Plastic king solenoid valves and all stainless steel should be selected; For strongly corrosive media, isolation membrane type must be selected. Neutral media, it is also advisable to use copper alloy as the valve shell material for solenoid valves, otherwise rust debris often falls off from the valve shell, especially in situations where the action is not frequent. Ammonia valves cannot use copper materials.

2. Explosive environment: Corresponding explosion-proof products must be selected, and waterproof and dustproof varieties should be selected for outdoor installation or in dusty environments.

3. The nominal pressure of the solenoid valve should exceed the maximum working pressure inside the pipe.

Applicability of MAC solenoid valve：

1. Medium characteristics

1) Select different types of solenoid valves for gas, liquid, or mixed states;

2) Products with different specifications and medium temperatures may cause the coil to burn out and the sealing components to age, seriously affecting their service life;

3) The viscosity of the medium is usually below 50cSt. If it exceeds this value and the diameter is greater than 15mm, use a multifunctional solenoid valve; When the diameter is less than 15mm, use a high viscosity solenoid valve.

4) When the cleanliness of the medium is not high, a backwash filter valve should be installed in front of the solenoid valve. When the pressure is low, a direct acting diaphragm solenoid valve can be selected;

5) If the medium flows in a directional manner and backflow is not allowed, it needs to flow in both directions;

6) The medium temperature should be selected within the allowable range of the solenoid valve.

2. MAC solenoid valve pipeline parameters

1) Select valve ports and models based on the requirements of medium flow direction and pipeline connection method;

2) Select the nominal diameter based on the flow rate and valve Kv value, or choose the same pipe inner diameter;

3) Working pressure difference: Indirect pilot type can be selected for working pressure difference above 0.04Mpa; If the working pressure difference is close to or less than zero, direct action or step-by-step direct action must be selected.

3. MAC solenoid valve environmental conditions

1) The maximum and temperature of the environment should be selected within the allowable range;

2) In environments with high relative humidity and water droplets and rain, waterproof solenoid valves should be selected;

3) Special varieties should be selected for situations where there are frequent vibrations, bumps, and impacts in the environment, such as marine solenoid valves;

4) The use in corrosive or explosive environments should prioritize the selection of corrosion-resistant types according to safety requirements;

5) If the environmental space is limited, a multifunctional solenoid valve should be selected because it eliminates the need for a bypass and three manual valves, and is easy to maintain online.

4. MAC solenoid valve power supply conditions

1) Select AC and DC solenoid valves according to the type of power supply. Generally speaking, AC power supply is easy to access;

2) Voltage specifications should prioritize AC220V and DC24V as much as possible;

3) The fluctuation of power supply voltage is usually selected as+% 10% AC -15%, DC allowable ±% 10, if exceeding the tolerance, voltage stabilization measures must be taken;

4) The rated current and power consumption should be selected based on the power capacity. Attention should be paid to the high VA value during communication start-up, and indirect induction solenoid valves should be preferred when the capacity is insufficient.

5. Control accuracy of MAC solenoid valve

1) Ordinary solenoid valves only have two positions, on and off. When high control accuracy and stable parameter requirements are needed, multi position solenoid valves should be selected;

2) Action time: refers to the time from when the electrical signal is turned on or off to when the main valve action is completed;

3) Leakage rate: The leakage rate values given on the sample are commonly used economic levels.

The above content is provided by Shanghai Weite Rui; For details, please click: Selection criteria for MAC solenoid valve