The purpose and function of electric regulating valve
Used to regulate process parameters such as medium flow rate, pressure, temperature, and liquid level in the field of industrial automation process control.
Scope of application of electric control valve
Automatic control in civil systems such as air conditioning, heating, ventilation, and domestic hot water, as well as production processes in various industries such as chemical, petroleum metallurgy, and electric light industry.
Key points for selection
The main control parameters selected for electric control valves are: nominal diameter, design nominal pressure, allowable temperature range of the medium, flow coefficient, etc.
2. For strict situations where flow rate and opening height are directly proportional, dedicated regulating valves should be selected. Ball valves and butterfly valves can generally be selected for rough adjustment.
The sealing performance of valves is one of the main indicators for assessing the quality of valves. The sealing performance of valves mainly includes two aspects, namely internal leakage and external leakage. Internal leakage refers to the degree of sealing achieved between the valve seat and the closing component for the medium. External leakage refers to the leakage of the valve stem packing, the leakage of the middle gasket, and the leakage caused by casting defects in the valve body. Leakage is not allowed to occur.
The ideal flow characteristics of regulating valves include fast opening, parabolic, linear, and equal percentage. It is necessary to choose a regulating valve with appropriate flow characteristics based on the actual working flow characteristics.
The selection of the nominal diameter of the regulating valve should be determined based on the required flow capacity of the valve. The nominal diameter of the regulating valve should not be too large or too small. Excessive size increases engineering costs, and the valve is in a low percentage range, reducing adjustment accuracy and deteriorating control performance. Being too small increases system resistance, and even when the valve is 100% open, the system cannot meet the set capacity requirements.
6. Adjust the pressure difference and shut-off pressure difference of the regulating valve
For regulating valves, the allowable regulating pressure difference and shut-off pressure difference are important indicators for their selection. If the actual pressure difference is higher than the allowable adjustment pressure difference of the regulating valve, the valve will have the problem of inaccurate adjustment, and in severe cases, it will damage the valve actuator.
Valve structure
The electric control valve is composed of an electric actuator and a regulating valve, which are mechanically connected, assembled, debugged, and installed to form an electric regulating valve.
Main components
Part materials: valve body, valve cover, packing gland, valve stem, valve disc, sealing ring, indicator mark, valve stem nut, nut sleeve
Materials: gray cast iron, cast steel, stainless steel, brass
working principle
Working power supply: DC24V, AC220V, AC380V and other voltage levels.
Input control signal: DC4-20mA or DC1-5V.
Feedback control signal: DC4-20mA (load resistance below 500 ohms)
By receiving signals from industrial automation control systems (such as 4-20mA), the valve is driven to change the cross-sectional area between the valve core and seat to control process parameters such as flow rate, temperature, and pressure of the pipeline medium. Implement automated adjustment function.
The new electric control valve actuator contains feeding and clothing functions, accepts unified 4-20mA or 1-5V · DC standard signals, converts current signals into corresponding linear displacements, automatically controls the opening of the control valve, and achieves continuous adjustment of process parameters such as pressure, flow rate, temperature, and liquid level of the fluid in the pipeline.
Traffic characteristics
The flow characteristics of an electric control valve are the relationship between the relative flow rate of the medium passing through the valve and its opening, under the condition that the pressure difference between the two ends of the valve remains constant.
The flow characteristics of electric control valves include linear characteristics, equal percentage characteristics, and parabolic characteristics.
application area
In the fields of industrial automation systems such as electricity, chemical industry, metallurgy, environmental protection, water treatment, light industry, and building materials.
install
The electric regulating valve is most suitable for installation with the upper end of the working piston at the lower part of the horizontal pipeline. The temperature sensor can be installed at any position, and the entire length must be immersed in the controlled medium.
Electric regulating valves generally include drivers that receive driver signals (0-10V or 4-20mA) to control the valve for regulation. They can also be combined into intelligent network control systems according to control needs to optimize control and achieve remote monitoring.
Due to the automatic flow balancing of the system, installation and maintenance are more convenient, and the possibility of human error disrupting the balance is eliminated.
It has the characteristics of small size, light weight, simple connection, high flow rate, and high adjustment accuracy, and is widely used in industrial process automatic control systems in industries such as power, petroleum, chemical, metallurgy, environmental protection, light industry, teaching and research equipment.
Electric control valve internal components: Valve core type: Upper guide single seat (sleeve) plunger type valve core
Flow characteristics: linear characteristics, equal percentage characteristics, or quick opening characteristics
Material: 1Cr18Ni9Ti 0Cr18Ni12Mo2Ti
functional check
| valve |
Direct A → AB |
Bypass B → AB |
| Valve stem extended |
close |
open |
| Hair stem indentation |
open |
open |
Maintenance
Valves do not require maintenance. When performing valve or actuator repairs:
1. Stop the water pump and cut off the power supply to the water pump.
2. Close the shut-off valve.
3. Completely release the pressure in the pipeline and allow the pipeline to cool completely. If necessary, disconnect the power supply wiring.
Guarantee
The specific application technical data is only applicable to the use of Shandong Xinao products listed in the "Equipment Combination". If third-party products are used, the terms guaranteed by our company will become invalid.
technical data
| Function Parameter |
| Pressure level |
PN16/25/40/60 |
| Maximum temperature resistance |
180ºC 220ºC 350ºC |
| Working pressure |
Maximum not exceeding 0.8Mpa. If it has exceeded the limit, a high torque actuator can be selected |
| operation temperature |
If the temperature is too high, a valve radiator needs to be installed |
| ambient temperature |
-10-+55ºC |
| Connection method |
The national standard flange connection GBT/9113 (customizable) and threaded connection are only applicable to stainless steel valve seats |
| leakage |
Direct connection: 0... 0.02% zero leakage of kvs value |
| Allow media |
Cooling water, high-temperature water, compressed air, steam, thermal oil, etc |
| Material Science |
| valve body |
Cast iron HT250 sphere QT45 cast steel WCB |
Stainless steel material can be customized according to user requirements
304/316 |
| blind plate |
Same as valve body |
| valve stem |
stainless steel304/316 |
| valve seat |
stainless steel304/316 |
| valve core |
stainless steel304/316 |
| Valve stem tightness |
Polyethylene tetrafluoroethylene/carbon fiber |
| rated travel |
DN25-DN100 20mm
DN100-DN200 40mm
DN200-DN350 40/60mm |
Thank you for gaining a deeper understanding of our company and our products.
If you have any questions during use, no matter how small, you can contact us,
Our company promises:
We highly value your feedback on quality information and will provide a response to all quality feedback;
We provide customers with telephone guidance for installation, debugging, and training of buyer's technical personnel.
During the warranty period, except for human damage and force majeure factors, if the equipment itself has quality problems, we promise to provide maintenance services.
Our company provides long-term technical support. If the seller needs on-site service outside the warranty period, only the cost fee will be charged.
Our company has sufficient supply of vulnerable parts, and if the buyer requests to order spare parts, our company can provide them in a timely manner.
Thank you again! If you have any questions or product related matters, please let us know by email and we will restore them as soon as possible.
Shandong Xinao Self Control Technology Co., Ltd. welcomes you to come to China for tourism and on-site inspections at any time
Contact address; No. 44, Gongye South Road, High tech Zone, Jinan City, Shandong Province
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