Overview of steam solenoid valve

Steam solenoid valves are divided into two types: boiler steam saturated steam and steam from thermal power plants superheated steam. Steam solenoid valves are widely used in textile, printing, chemical, plastic, rubber, pharmaceutical, food, building materials, machinery, electrical, surface treatment and scientific research departments, as well as in self-control systems such as bathrooms, canteens, air conditioning, etc.

Structure diagram of steam solenoid valve product

Steam solenoid valve medium description

The steam we come into contact with in daily life is often divided into two types: 1. Boiler steam saturated steam, and 2. Steam from thermal power plants superheated steam

1. Saturated steam temperature and pressure are relatively stable, with a temperature below 250 ℃ and a working pressure below 1.6Mpa

2. The temperature and pressure variation base of superheated steam is relatively large, and the highest temperature can reach over 400 ℃, while the working pressure is below 4.0Mpa

For the first type of steam, we usually choose soft sealed steam solenoid valves.

Structural characteristics of steam solenoid valve

This valve is a pilot operated secondary opening solenoid valve composed of two main components: the auxiliary valve and the main valve

Heat resistance: Special high-temperature resistant electrical and sealing materials are used for the electromagnetic and sealing parts, and various insulation measures are applied

Wear resistant: Reasonable material selection, valve cup and guide sleeve cleverly utilize the lubrication effect of fluid to reduce wear and improve service life

Condensation resistance: The condensation water in the steam pipeline is an important factor affecting the operation of the steam solenoid valve, while this valve is not affected by condensation water

Steam electromagnetic soft seal solenoid valve

This series of solenoid valves can also be widely used in textile, printing, chemical, plastic, rubber, pharmaceutical, food, building materials, machinery, electrical, surface treatment and scientific research departments, as well as in bathroom, canteen, air conditioning and other self-control systems.

For the second type of steam, we usually use hard sealed steam solenoid valves as follows:

Structural characteristics

Adopting metal hard sealing improves the product's operating temperature and service life

Reasonable material selection, cleverly utilizing the lubrication effect of fluid in the valve cup and guide sleeve to reduce wear

Steam solenoid valve hard seal solenoid valve

This product has a wide range of universal media and can be used for fluids such as water, light oil, heavy oil, non corrosive gases, and steam.

In the drainage system of power station exhaust pipelines and the exhaust system of evaporators, the main function is to perform dual position automatic regulation and remote control of the medium in the pipelines.

working condition

Normally closed - powered on to open, powered off to close. Normally open - powered off to open, powered on to close

Working principle of steam solenoid valve

1. The steam solenoid valve is a step-by-step direct pilot solenoid valve, which can be divided into normally closed solenoid valves and normally open solenoid valves according to the different open and closed states when the power is cut off.

2. Normally closed steam solenoid valve, after the coil is energized, the armature first drives the auxiliary valve plug to lift under the action of electromagnetic force. The fluid on the main valve cup flows away through the auxiliary valve, reducing the pressure acting on the main valve cup. When the pressure on the main valve cup decreases to a certain value, the armature drives the main valve cup and uses the pressure difference to open the main valve cup, allowing the medium to flow. After the coil is powered off, the electromagnetic force disappears and the armature falls back to its original position due to its own weight. At the same time, relying on the pressure of the medium, the main and auxiliary valves can be tightly closed.

3. Normally open steam solenoid valve. After the coil is energized, due to the suction force, the moving iron core moves downward, presses down the auxiliary valve plug, closes the auxiliary valve, and the pressure inside the main valve cup increases. When the pressure rises to a certain value, the pressure difference between the upper and lower parts of the main valve cup is the same. Due to the electromagnetic force, the moving iron core loses the lower part of the main valve cup, compresses the main valve seat, and the valve closes. When the coil is powered off, the electromagnetic suction force is zero, and the auxiliary valve plug and supporting iron core are lifted upward due to the spring action. The auxiliary valve opens, and the main valve cup is pushed up by the pressure difference. The main valve opens and the medium flows.

Maintenance and upkeep of steam solenoid valve

1. Regularly clean the dirt inside and outside the high-temperature steam solenoid valve and the suction surface, and be careful not to damage the sealing surface.

2. After the installation of the high-temperature steam solenoid valve, it needs to be tested several times with the medium and confirmed to be normal before it can be put into formal use.

3. When used for a long time, if the sealing between the piston and the valve seat is not good, the sealing surface of the piston can be re ground flat and then ground with the valve seat.

4. When the high-temperature steam solenoid valve is not in use for a long time, the manual valve in front of the valve should be closed. When it is restarted, the steam solenoid valve should drain the condensed water and perform several trial operations. It can only be put into use after the switch is normal.

5. When the high-temperature steam solenoid valve is removed from the pipeline and not in use, the interior and parts should be wiped clean and stored with compressed air.

6. It is recommended that the user unit assign a dedicated person to be responsible for use and maintenance.

7. When working, pay attention to the pressure gauges before and after the valve, and ensure that the working pressure does not exceed the rated pressure. The working pressure difference must be within the rated pressure difference range. When the working pressure exceeds the rated pressure or the working pressure difference exceeds the rated pressure difference, the solenoid valve should be stopped and the front and rear manual valves should be closed to prevent the solenoid valve from exploding and leaking.

Installation of steam solenoid valve

1. In the case of insufficient rigidity of the pipeline, it is recommended to fix the pipeline in front of the valve with a bracket to prevent vibration caused by the operation of the solenoid valve.

2. The working medium of the steam solenoid valve should be clean and free of particulate impurities. The dirt and filters on the surface of the solenoid valve components should be cleaned regularly.

3. When the steam solenoid valve malfunctions, it is best to install a bypass device in order to isolate the solenoid valve in a timely manner and ensure the normal operation of the system

4. In the pipeline system, the diameter of the solenoid valve installed on the branch should be smaller than that of the main pipeline valve (as shown in Figure 2).

5. When installing, the solenoid valve coil should be facing upwards and kept in a vertical position. The arrow or mark on the solenoid valve should be consistent with the flow direction of the pipeline and should not be installed in areas with splashing or leaking water.

6. The steam solenoid valve should not be installed in the low concave part of the pipeline to avoid hindering its operation due to the sedimentation of steam condensate, impurities, etc. inside the valve.

7. The regular type cannot be used in explosive hazardous environments.

8. Before installing the steam solenoid valve, the pipeline must be cleaned thoroughly. It is recommended to install a filter in front of the valve and a drain valve in the steam pipeline.

9. Before installation, pay attention to the product label, carefully read the user manual, and determine whether the product meets the usage conditions.

10. Pressure gauges need to be installed on the pipelines before and after the steam solenoid valve to observe the pipeline pressure.