Jul. 29, 2024
Choice of valve type
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1. To determine the
nominal pressure
, instead of using Pmax to cover the PN, find the corresponding PN from the table according to the three conditions of temperature, pressure and material and satisfy the PN value of the selected valve.2. The determined valve type , its leakage meets the process requirements.
3. The working pressure difference of the determined valve type should be less than the allowable pressure difference of the valve. If not, it must be considered from a special angle or another valve should be selected.
4. The temperature of the medium is within the working temperature range of the valve, and the ambient temperature meets the requirements.
5. Consider the anti-blocking problem of the valve according to the unclean condition of the medium.
6. Consider the corrosion resistance of the valve according to the chemical properties of the medium.
7. Consider the erosion and wear resistance of the valve according to the pressure difference and the medium containing hard objects.
8. The performance and price ratio considering the comprehensive economic effect.
You need to consider 3 issues:
9. Optimal order.
Choice of Executor
1. The simplest is the pneumatic film type, followed by the piston type, and finally the electric type.
2. The main advantage of electric actuators is that the driving source (power supply) is convenient, but the price is high, reliability, waterproof and explosion-proof are not as good as pneumatic actuators, so the pneumatic type should be preferred.
3. The old electric actuators are heavy and heavy, and we have already provided electronic small, small and highly reliable electric actuators (the price is correspondingly high).
4. The old ZMA and ZMB thin-film actuators can be eliminated and replaced by multi-spring light actuators (the performance is improved, and the weight and height are reduced by about 30%).
5. There are many varieties and specifications of piston actuators, and the old, big and stupid ones are no longer recommended, but a new light structure is used.
Material selection:
1. The valve body pressure rating, operating temperature and corrosion resistance should not be lower than the requirements of the process connection pipeline, and the manufacturer&#;s finalized products should be preferred.
2. Cast iron valves are not suitable for water vapor or wet gas with more water and flammable and explosive media.
3. When the ambient temperature is lower than -20°C (especially in the north), cast iron valves should not be used.
4. In the Cartesian coordinates formed by the medium temperature and pressure difference with serious cavitation and erosion, when the temperature is 300°C and the pressure difference is 1.5MPa in the area beyond the line connecting the two points, the throttling sealing surface should be Choose wear-resistant materials , such as cobalt-based alloys or surface surfacing Stellite alloys.
5. For strong corrosive media, the selection of corrosion-resistant alloys must be based on the type, concentration, temperature and pressure of the medium, and appropriate corrosion-resistant materials must be selected.
6. The valve body and the throttling part are treated separately. The throttling speed of the valve body wall is small and a certain degree of corrosion is allowed. The corrosion rate can be about 1 mm/year; the throttling part is eroded by high speed and corroded, which will cause leakage and increase. If it is large, the corrosion rate should be less than 0.1mm/year.
7. When selecting the lining material (rubber, plastic), the temperature, pressure and concentration of the working medium must meet the use range of the material, and consider the physical and mechanical damage (such as shear damage) of the valve when it acts. ..
8. The vacuum valve should not be lined with rubber or plastic in the valve body.
9. The two-position shut-off valve of the water treatment system should not be made of rubber-lined materials.
10. Typical corrosion-resistant alloy material selection for typical media:
&#;
Sulfuric acid: 316L, Hastelloy, Alloy 20.&#;
Nitric acid: aluminum, C4 steel, C6 steel.&#;
Hydrochloric acid: Hastelloy B.&#;
Hydrofluoric acid: Monel.&#;
Acetic acid, formic acid: 316L, Hastelloy.&#;
Phosphoric acid: Inconel, Hastelloy.&#;
Urea: 316L.&#;
Caustic soda: Monel.&#;
Chlorine: Hastelloy C.&#;
Seawater: Inconel, 316L.11. So far, the most versatile corrosion-resistant material is tetrafluoroethylene, which is called &#;corrosion-resistant king&#;.
Therefore, the PTFE corrosion-resistant valve should be selected first, and the alloy should be selected only if it is unavoidable (such as temperature>180&#;, PN>1.6).
Choice of flow characteristics
The following are preliminary selections. For detailed selections, please refer to the special materials.
1. The logarithmic characteristic is selected when S>0.6.
2. The logarithmic characteristic is selected when working with small opening and when the unbalanced force changes greatly.
3. The required adjusted parameter reflects the straight line when the speed is fast, and the logarithm when it is slow.
4. The linear characteristic of the pressure regulation system is optional.
5. The linear characteristic of the liquid level adjustment system is optional.
Action mode selection
1. It is commonly used in foreign countries to indicate that it is open or closed under fault, that is, fault open and fault close, which is exactly the opposite of my country&#;s air open and air closed.
2. The new light valve and fine small valve no longer emphasize the positive and negative effects of the execution machinery, so they must be marked on the endnote.
Choice of spring ranges
1. The first is to select the spring range, and also to determine the working spring range.
2. Determining the working spring range involves calculating the output force to overcome the unbalanced force. If there is any difficulty, the conditions (mainly the pressure difference when the valve is closed) should be told to the manufacturer to assist in the calculation and adjustment of the spring and the working range before leaving the factory (at present, many manufacturers do not do the calculation at all).
Choice of flow direction
1. At the throttling port, the flow of the medium in the opening direction of the valve core is flow opening, and the flow in the closing direction is flow closing.
2. The choice of flow direction is mainly single-sealed regulating valve , which includes three categories: single-seat valve, angle valve, and single-sealed sleeve valve. It is based on the specified flow direction (such as double seat valve, V ball) and arbitrary flow (such as O ball).
3. When dg>15, the flow is usually selected to be open. When dg&#;15, the small-diameter valve, especially the high-pressure valve, can be selected to be closed to improve the service life.
4. Optional flow and close for the two-position switch valve.
5. If the flow-closed valve oscillates, change it and the flow-open type can be eliminated.
Choice of fillers
Contact us to discuss your requirements of electric single seat control valve manufacturers china. Our experienced sales team can help you identify the options that best suit your needs.
Related links:1. Commonly used in regulating valves are tetrafluoro &#;V&#;-shaped packing and graphite &#;O&#;-shaped packing.
2. The tetrafluoro packing has small friction, but has a short temperature difference and a short life; the graphite packing has large friction, but has good temperature resistance and long life; it is recommended to choose graphite packing under high temperature and for valves with positioners.
3. If the tetrafluoro packing is often replaced, graphite packing can be considered.
Choice of accessories
1. The accessories of the regulating valve mainly include: positioner, converter, relay, booster valve, position retaining valve, pressure reducing valve , filter, lubricator, travel switch, position transmitter, solenoid valve, Handwheel mechanism.
2. The accessories play a supplementary function and ensure the operation of the valve. Increase when necessary, not increase when unnecessary. Adding accessories when not necessary increases the price and reduces reliability.
3. The main function of the positioner is to improve the output force and action speed. When these functions are not required, it can be omitted. It is better not to bring the positioner.
4. For fast response systems, the valve does not act quickly, and a converter is optional.
5. For strict explosion-proof occasions, optional: electrical converter + pneumatic positioner.
6. The solenoid valve should choose a reliable product to prevent it from not moving when it is required to act.
7. In important occasions, it is recommended not to use the handwheel mechanism to prevent human error.
8. It is best to provide by the manufacturer and supply the assembly on the valve to ensure the reliability of the connection between the system and the assembly.
9. When ordering, the name, model, specification, input signal, output signal, etc. of the accessories should be provided.
10. To reiterate: Please pay attention to the importance of these &#;little things&#;, especially reliability. If necessary, pneumatic components such as solenoid valves can be provided.
The electric control valve is a power-operated device that regulates a streamlined flow of gases, steam, water, and oil. It is considered one of the most important components used in industries to regulate the flow of materials.
Read this guide to find detailed information about working, application, advantages, and electric control valve pricing.
Electric control valve works on the principle of electromagnetic induction. It has a solenoid valve which is an electric coil. In its central position, it has a plunger or ferromagnetic core. When the solenoid valve is at rest position, its plunger closes a small orifice. When it is working, an electric current passes through a coil that creates a magnetic field. This magnetic field creates a force in an upward direction. Hence, it opens the orifice. This opening allows the liquids and gases to pass through it&#;however, the direction of flow of materials and exerted force work in the opposite directions.
The flow of liquids and gases in an electric control valve depends on these two factors:
The orifice diameter plays a central role in maintaining a flow rate and maximum operating pressure. A small orifice diameter generates more pressure and a more speedy flow of materials through it. Hence, you can easily maintain pressure differences from 0 bars up to the maximum allowable pressure ranges.
The amount of electric force generated is directly proportional to the flow of materials through an orifice. Therefore, more magnetic force means a more steady flow of materials. However, a permanent magnet generates a stronger magnetic field than a regular coil.
Determine the surface coating material that makes a valve suitable for working under critical industrial conditions
Any failure in an electric control valve can lead to massive destruction and irreversible damages to the industrial environment. Below are some common reasons that lead to the failure of valves:
Contact us for recommendations if you encounter leakage, noise, the excessive outflow of materials, or any of the symptoms mentioned above.
Follow these simple guidelines to increase the shelf life of an electric control valve:
An electric control valve is suitable for a variety of industrial applications. Here is a list of industries in which control actuators are used significantly:
If you are looking for other intended applications, let us know. BCST manufactures customized electric control valves to meet your industrial requirements. Call us for more details!
An electric control valve consists of the following parts that work synergistically to maintain an efficient flow of liquids and gases.
An electric control valve has either a reciprocating or rotating body.
It has an actuating device that is usually a spring diaphragm.
The valve positioner is a device that converts electric control signal from a controller device into an air signal. Thus, it controls the position of the entire system.
An air set or regulator maintains an accurate pressure level to the positioner. It smoothly channelizes air in the valve.
An electric control valve is available in the following materials:
You can contact our production team members to customize the electric control valve in any material to meet your industrial requirements. The selection of material is made by analyzing your requirements and intended industrial applications. The critical working conditions also play a significant role in choosing the suitable material for manufacturing an electric control valve.
The electric control valve is suitable for a variety of applications. However, when you are selecting an electric control valve, it is important to determine its compatibility with materials. An electric actuator is suitable to maintain a streamlined flow of the following materials:
These three types of media are super reliable for all types of electric actuators. Moreover, it is also significant to analyze the working environment, including the media&#;s temperature, pressure, and corrosiveness. You can also consult our professional team members about important materials suitable for an electric control valve.
Three-body types of electric control valve ports include:
You can order customized electric actuators from BCST in different port designs & body types according to the industrial applications at very affordable rates.
Following are the features of an electric control valve:
The features mentioned above of electric actuators make them reliable for different industries. All you need to monitor their performance to ensure the best results regularly.
Use a blind flange to blind the output of the control valve. Check the body rating of the control valve. Open the valve at the time of testing. Now perform the test.
The amount of total pressure that a body can withstand without leakage is called body rating.
You can efficiently perform flow tests to determine leakage and streamline the flow of materials through the electric control valve.
If you observe any leakage, identify damages in the trim, actuator, and valve stem system. Probably, when these devices fail to connect properly, leakage occurs. Repair these damages to maintain a steady flow of gases, liquids, and semi-solid materials.
Function test determines the performance and functionality of an electric control valve. Please follow these simple guidelines to perform a function test:
BCST performs the below-mentioned tests to check the functionality and performance of an electric control valve:
Our experts perform these tests under strict supervision and internationally accepted laboratory-controlled conditions. We have the latest tools and pieces of lab equipment to perform these tests. Do not try these tests yourself to avoid serious injuries.
If the value of an electric control actuator is not opening or closing, you can troubleshoot it in the following ways:
Closely monitor these stages to troubleshoot the working condition of an electric control valve. If you cannot troubleshoot the root cause, contact our trusted team members to solve your problem in just a few minutes.
An electric control valve requires either 4-20 mA or 0-10 V DC signal input. The input of 4 mA or 0 V closes the valve. Similarly, the input of 20 mA or 10 V DC opens the valve. However, any signal in between these two situations corresponds to a proportional situation. These input signal modulations are according to the industrial requirements. Therefore, any change in the signal input can lead to drastic changes in the output of an electric control valve. Moreover, this input signal can also be modulated as per industrial requirements to maintain a steady flow of liquids and gases.
A heavy-duty electric control valve offers the following benefits:
You can contact our customer care center anytime to get comprehensive information about an electric control valve.
The advantages of using an electric control valve are many folds higher than its disadvantages. Its downsides include:
Besides the disadvantages mentioned above, there are no downsides to using an electric actuator. It is super reliable for a variety of industrial requirements. You can contact us to order customized electric actuators either in bulk or in small form. We guaranteed high performance and reliability to generate 100% results.
The average price of an electric control valve varies from $30 to $300. BCST offers competitive market rates and high-quality products to meet the requirements of our customers. The pricing of electric actuators depends on their quantity, size, materials, and pressure monitoring capabilities. You can also order customized products at very affordable rates. However, the rates of customized electric actuators vary as per your shared specifications. It also varies according to the current market conditions. You can also contact our accounts team members to get pricing-related queries. In case of more information, please visit our website or call us.
BCST is a leading manufacturer and supplier of electric control valves. You can place customization orders in single or bulk form. However, before placing orders, you have to provide specific dimensions, including diameter, orifice size, manufacturing materials, geometry, and intended industrial applications. The expert engineers evaluate your provided information to design a custom-made strategy. Once we get approval from you, we immediately start working on it. The charges for customizations are based on the provided information. After manufacturing of products, we perform tests to evaluate the performance. BCST guarantee 100% performance and reliability of electric control valves.
BCST is a certified supplier of the electric control valve. The warehouse is equipped with extensive inventory units and the latest technology for the manufacturing of high-quality products. However, it takes approximately 10 working days to ship your orders. In the case of special orders, you need to pay extra charges to ensure the timely shipment of products. Additionally, customized proposals require a specific duration as per your shared specifications. Orders are not delayed beyond the designated duration. You can track your booked order by entering the tracking number to check its delivery status. Please inquire your sales associate to get a detailed piece of information for the shipment.
A high-performance electric control valve includes the following parts:
Moreover, an electric control valve is also equipped with Fieldbus technology for automation processes. However, it requires data cables and other special connections for signal transduction. However, during the process of customization, these parts can be changed as per the shared specifications of customers.
Electric control valve permits automatic, semi-automatic, and manual operations. These high-performance valves are suitable for high-speed opening and closing of valves. The torque of the motor or position of the valve operates the actuator of an electric control valve. Similarly, a limit switch automatically stops the fully closed or fully opened valve. The utility of all these functions depends on industrial requirements and installation facilities. Although electric actuators are expensive, it is reliable for critical applications. It is perfect for low ambient temperatures, freezing pneumatic supplying systems, large stem forces, and devices with no air supply.
In an electric control valve, an electric actuation technique is used. It is actually a solenoid actuator in the electromagnetic coil. The solenoid actuator energizes and creates a magnetic force. This magnetic force pulls the armature and connects to the armature. However, it is done according to the requirements of the system.
Additionally, an electric control valve is also operated manually. Operator and critical working conditions control it. It would help if you had pushbuttons, pedals, and panels to manually control electric actuators.
This guide has summarized all the essential features of an electric control valve. An electric control valve is a high-performance device to maintain a steady flow of liquids, gases, or semi-solid materials. It will help you in achieving the highest functionality rate during multiple industrial applications.
You can contact on our number +86 517 anytime for any query about electric control valve. Also, drop an at: . We are always ready to serve you.
To design a customized electric control valve, don&#;t hesitate to get in touch with BCST. We turn your dreams into reality!
The company is the world’s best pneumatic globe valve manufacturers china supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.
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