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Liquid ammonia special solenoid valve SHFKL
Liquid ammonia solenoid valve - miniature solenoid valve - solenoid valve control principle model: SHFKL-25P specification: DN15-50 threaded connectio
Product details
Liquid ammonia solenoid valve - miniature solenoid valve - control principle of solenoid valve
Model: SHFKL-25PSpecification: DN15-50 threaded connection
Liquid electromagnetic valvePurpose:
Liquid ammonia solenoid valve（Liquid electromagnetic valve is an automatic valve operated by AC power, which is suitable for automatic control of refrigeration devices with ammonia or Freon as the medium, directly controlling the flow of the medium in the pipeline.
There are many types of solenoid valves, which can be divided into several categories according to their organizational structure at room temperature:
1. Austenitic body type: such as 304, 321, 316, 310, etc;
2. Martensitic or ferritic type: such as 430, 420, 410, etc;
Austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic.
Liquid electromagnetic valveParameters:
Principle structure: step-by-step direct action guided piston type
Principle: When powered on, the electromagnetic coil generates electromagnetic force to lift the closing member from the valve seat, and the valve opens; When the power is cut off, the electromagnetic force disappears, and the spring presses the closing member against the valve seat, causing the valve to close.
Characteristics: It can work normally under vacuum, negative pressure, and zero pressure, but the diameter generally does not exceed 25mm.
Working environment temperature: -20-50 ℃, -40-80 ℃
Coil operating temperature:<50 ℃,<85 ℃
Control mode: normally open (turned off when powered on, turned on when powered off); Normally closed (power off to close, power on to open)
International standard voltage: AC220V, DC24V
Media: helium, liquid ammonia, alcohol, liquid oxygen, etc
Temperature:<-40 ℃,<-100 ℃,<-120 ℃,<-200 ℃
Pressure: 1 bar, 3 bar, 6 bar, 10 bar, 16 bar, 25 bar
Valve body material: stainless steel body (304, 316), cast steel (WCB)
Coil connection method: iron cover lead, plastic sealed wire box plug
Sealing material performance: high temperature resistance, pressure resistance, wear resistance, corrosion resistance
Leakage rate: zero
Sealing structure: Arc cone line and cone surface sealing
Performance characteristics: wide versatility, high sensitivity, strong tightness, long lifespan
Scope of work: Metallurgical industry, petrochemical industry, power equipment, low-temperature equipment, liquid nitrogen equipment, cooling equipment, experimental equipment, etc
Micro solenoid valves commonly used as decorative tube plates are mostly made of austenitic 304 material, which is generally non-magnetic or weakly magnetic. However, magnetic properties may also occur due to chemical composition fluctuations or different processing states caused by smelting, but this cannot be considered counterfeit or unqualified. What are the reasons for this?
As mentioned above, austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to compositional segregation or improper heat treatment during smelting, a small amount of martensite or ferrite structure may be present in austenitic 304 solenoid valves. In this way, there will be weak magnetism in the 304 solenoid valve.
Annotation:
1. If there are impurities in the fluid, a filter valve (30-80 mesh/inch) must be installed at the inlet of the solenoid valve, and there must be no solidification or crystallization phenomenon.
2. The installation direction of the solenoid valve is unlimited. (S-horizontal installation, C-vertical installation)
Liquid electromagnetic valveControl principle, main characteristics of solenoid valve:
The system is simple, easy to connect to a computer, and the price is affordable. The solenoid valve itself has a simple structure and low price, making it easier to install and maintain compared to other types of actuators such as regulating valves. More significantly, the composed self-control system is much simpler and priced much lower. Due to the fact that the solenoid valve is controlled by switch signals, it is very convenient to connect with industrial control computers. In today's era of widespread computer use and significant price reductions, the advantages of solenoid valves are even more apparent.
After cold processing, the microstructure of 304 solenoid valve will also transform into martensite. The greater the deformation degree of cold processing, the more martensite transformation will occur, and the magnetic properties of the steel will also increase. Like steel strips of the same batch number, producing Φ 76 tubes without obvious magnetic induction, producing Φ 9.5 tubes. Due to the large deformation caused by bending, the magnetic induction is more obvious. The production of square and rectangular pipes has a larger deformation amount than circular pipes, especially in the corner part, where the deformation is more intense and the magnetic induction is more obvious.
Action express, with minimal power and lightweight appearance. The response time of solenoid valves can be as short as a few milliseconds, and even pilot operated solenoid valves can be controlled within tens of milliseconds. Due to its self-contained circuit, it responds more sensitively than other self-control valves. A well-designed solenoid valve coil has low power consumption and is considered an energy-saving product; It can also automatically maintain the valve position by triggering the action, without consuming any electricity during normal operation. The electromagnetic valve has a small external size, which saves space and is lightweight and beautiful.
To completely eliminate the magnetism of 304 steel caused by the above reasons, high-temperature solution treatment can be used to restore stable austenite structure and eliminate magnetism.
It should be noted that the magnetism of 304 solenoid valve caused by the above reasons is not at the same level as that of other materials such as 430 and carbon steel solenoid valves, which means that the magnetism of 304 steel always shows weak magnetism.
This tells us that if the solenoid valve has weak magnetism or no magnetism at all, it should be classified as 304 or 316 material; If it exhibits strong magnetism similar to carbon steel, it is determined that it is not made of 304 material.
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