US MAC solenoid valve selection notes introduction

Founded in 1948, MAC Valves Inc. is the largest solenoid valve manufacturer in North America. With more than 70 patented technologies, it designs and manufactures high performance air pressure solenoid valves. Due to its unique structural design and excellent performance quality, it has a 26% market share in North America. The MAC solenoid valve combines all the design concepts required for high-speed valve movement and 60 years of valve manufacturing experience. The company's performance of the valve can reach the limit you can't believe, and can meet any strict requirements of speed and accuracy. It is yours. The only choice in high-speed, precise applications, the most important is the original 18-month unlimited quality assurance, long life and reasonable price. At the same time, the MAC solenoid valve has a completely different installation method from other manufacturers: serial connection, this structure can easily connect up to 128 valves and can be arbitrarily disassembled without installing the bottom plate, which greatly facilitates the flexibility of practical application and saves cost. . The MAC product line includes: three-way solenoid valve, four-way solenoid valve, bullet valve, valve island, proportional control valve, machine control valve, explosion-proof valve, etc.
MAC solenoid valve is the world's top star in the pneumatic industry. Its products are spread all over the world. So what issues should we pay attention to when choosing? What are the characteristics of MAC solenoid valve? Let's take a look at the following Take a look, let's do the preliminary work for us to use the MAC solenoid valve in the future.

  MAC solenoid valve is the world's top star in the pneumatic industry. Its products are spread all over the world. So what issues should we pay attention to when choosing? What are the characteristics of MAC solenoid valve? Let's take a look at the following Take a look, let's do the preliminary work for us to use the MAC solenoid valve in the future.
 
    First, let's take a look at the selection of MAC solenoid valves.
 
    MAC 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, and operating methods). , special requirements to choose).
    MAC solenoid valve 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 or flow requirement of the pipeline;
    2) Interface mode, generally >DN50 should select 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 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 it is necessary to select a piston type 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, a high viscosity solenoid valve should be used.
 
    3. Select the solenoid valve according to the pressure parameters: principle and structure
 
    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, according to the length of continuous working time to choose: normally closed, normally open, or sustainable power
 
    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.
 
    MAC Solenoid Applicability:
 
    1, MAC solenoid valve dielectric characteristics
 
    1) Different types of solenoid valves are selected for the gas, liquid or mixed state;
    2) The medium temperature is different in specifications, otherwise the coil will burn out and the seal will age, which will seriously affect the life expectancy;
    3) The viscosity of the medium is usually below 50 cSt. If this value is exceeded, the multi-function solenoid valve is used when the diameter is larger than 15 mm; the high-viscosity solenoid valve is used when the diameter is less than 15 mm.
    4) When the medium cleanliness is not high, the backwash filter valve should be installed in front of the solenoid valve. When the pressure is low, the direct-acting diaphragm type solenoid valve can be used.
    5) If the medium is directional and does not allow backflow, it needs to be circulated in both directions;
    6) The medium temperature should be selected within the allowable range of the solenoid valve.
 
    2, MAC solenoid valve parameters
 
    1) Select the valve port and model according to the flow direction requirements and pipe connection method;
    2) The nominal diameter is selected according to the flow rate and the valve Kv value, and the inner diameter of the pipe can also be selected;
    3) Working pressure difference: The minimum working pressure difference is above 0.04Mpa, which is optional indirect pilot type; the minimum working pressure difference is close to or less than zero, you must use direct-acting or step-by-step direct type.
 
    3, MAC solenoid valve environmental conditions
 
    1) The highest and lowest temperatures of the environment should be selected within the allowable range;
    2) When the relative humidity in the environment is high and there are water droplets and rain, etc., the waterproof solenoid valve should be selected;
    3) Special vibrations, bumps and impacts should be selected in the environment, such as marine solenoid valves;
    4) In the case of corrosive or explosive environment, the corrosion resistant type should be selected according to the safety requirements;
    5) If the environmental space is restricted, a multi-function solenoid valve is required because it eliminates the bypass and three manual valves and facilitates online maintenance.
 
    4, MAC solenoid valve power supply conditions
 
    1) According to the type of power supply, AC and DC solenoid valves are used respectively. Generally, AC power is convenient to use;
    2) Use the AC220V.DC24V as much as possible for the voltage specification;
    3) The fluctuation of the power supply voltage is usually +%10%.-15% for AC and ±10% for DC. If it is too poor, it must be stabilized.
    4) The rated current and power consumption should be selected according to the power supply capacity. It should be noted that the VA value is higher when the AC starts, and the indirect-lead solenoid valve should be preferred when the capacity is insufficient.
 
    5.MAC solenoid valve control accuracy
 
    1) The ordinary solenoid valve can only open and close two positions. When the control precision is high and the parameter requirements are stable, multiple solenoid valves should be selected.
    2) Action time: refers to the time when the electrical signal is turned on or off to the main valve action completion time;
    3) Leakage: The amount of leakage given on the sample is the common economic rating.
 

    MAC solenoid valves currently account for 26% of the market in the United States. 45% of its customers use packaging machinery, and the rest are selected machinery, tire machinery, mining, automotive industry, electronics industry, aluminum products industry, wood industry, paper industry, printing industry, food industry and beverage industry. Its main features: 1. Balanced valve design, reaction time is not affected by pressure changes; 2. Spool anti-seize protection design, avoiding electric coil burning; 3. Electric coil suction is large, ensuring fast and accurate action; 4. Automatic Compensate for wear and increase the service life of the valve; 5. The electric coil is isolated from the air to increase the life of the coil; 6. The size and diameter are available, and the M5-2 1/2" system is optional;