Control Valves Manufacturer China Control Valve Factory

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:

• simple structure (the simpler the higher the reliability), the maintenance is convenient, and the spare parts are sourced
• service life
• price

9. Optimal order.

• Butterfly valve
• Single seat valve
• Double seat valve
• Sleeve valve
• Angle valve
• Three-way valve
• Ball valve
• Eccentric rotary valve
• Diaphragm valve

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:

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Sulfuric acid: 316L, Hastelloy, Alloy 20.

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Nitric acid: aluminum, C4 steel, C6 steel.

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Hydrochloric acid: Hastelloy B.

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Hydrofluoric acid: Monel.

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    Acetic acid, formic acid: 316L, Hastelloy.

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Phosphoric acid: Inconel, Hastelloy.

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Urea: 316L.

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Caustic soda: Monel.

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Chlorine: Hastelloy C.

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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.

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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

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. 

Choosing the right electric butterfly valve for your application is essential for optimal performance. It’s important to consider factors such as size, material type, pressure rating, actuator type and when applicable, torque setting and thread lubrication for each material type. To ensure you select the correct valve for your system, understanding these components is critical in order to avoid any problems down the road.

Introduction

When choosing an electric butterfly valve, it is important to understand its benefits and applications, as well as take into account factors such as size and material type, pressure rating, and actuator type. Furthermore, correct installation of the valve requires precision when it comes to torque setting and thread lubrication according to the specific material used. Selecting the right electric butterfly valve can provide significant long-term benefits and ensure that your system works optimally.

Overview of electric butterfly valves, their benefits and applications

An electric actuated butterfly valve is an automated control device used to regulate the flow of air, gas, steam or liquids. These valves are highly efficient and provide precise and accurate control in a range of applications due to their unique design. Electric butterfly valves offer many benefits such as energy savings, cost savings, improved system control, pressure management and extended service life. They are widely used in industries including HVAC systems, wastewater treatment facilities and oil refineries among others. With careful consideration of factors like size, material type, pressure rating and actuator type you can ensure optimal performance with your electric butterfly valve.

Factors To Consider When Choosing an Electric Butterfly Valve

When selecting an electric butterfly valve for your application, there are several factors you should take into consideration. Size is one of the most important criteria to consider when choosing the right valve. Electric butterfly valves come in different sizes ranging from small to large depending on the type of system you will be using it in. Additionally, you should consider the material types used to construct the valve and pick a suitable option that meets your requirements. The pressure rating should also be taken into consideration to ensure optimal performance as electric butterfly valves vary in range depending on their construction materials.

Lastly, you should choose an actuator type based on your system needs and preferences. Commonly used actuator types include pneumatic actuation, hydraulic actuation, and electric actuation. Taking all these factors into account can help you make sure that you select an electric butterfly valve that will provide long-term service with minimal maintenance requirement for your system.

Size and material type

Size and material type are two important factors to consider when selecting an electric butterfly valve. The size of the valve will depend on the type of system you are using, as different sizes are available depending on the specific application. Additionally, the material types used in construction will also play a key role in the life span and effectiveness of the valve. Common materials include stainless steel, chrome plated brass, or plastic composites.

Each material comes with its own benefits, so make sure to choose one that meets your requirements and is compatible with your application. Furthermore, be sure to check the pressure rating to ensure it can handle your system’s requirements for optimal performance. With careful selection of both size and material type, you can make sure to invest in an electric butterfly valve that provides long-term service with minimal maintenance requirement.

Pressure rating

Pressure rating is an important factor to consider when selecting an electric butterfly valve. This rating indicates the maximum pressure that can be applied to the valve without compromising performance or causing damage. It is typically found on the manufacturer’s specification sheets and should be taken into account when choosing a suitable model for your application.

Additionally, check any relevant safety regulations specific to your industry, as failure to adhere to these could result in unsafe operation and potential accidents. When in doubt, always consult with a professional for advice regarding appropriate pressure ratings and ensure that you are installing a reliable and properly rated electric butterfly valve for optimal performance.

Actuator type

Actuator type is an important factor to consider when selecting an electric butterfly valve. There are two main types of actuators available – pneumatic and electric. Pneumatic models utilize air pressure and are often simpler to install, while electric models typically require a more complex setup but can provide greater accuracy and control over the valve operation.

Depending on your specific requirements, you may need to select a particular type of actuator to achieve optimal performance from your valve. Different materials, such as bronze or stainless steel, may also be required for certain applications and should be taken into account when choosing the appropriate device for your needs. Consult with a professional if you have any questions about which type of actuator is best for you.

Tips for Installing an

Installing an electric butterfly valve can be a daunting task, but there are several tips you can use to make sure it is done correctly, safely and efficiently. First of all, determine the type of connection you will require for the installation. This could either be threaded or flanged depending on what is compatible with your system.

Next, make sure that the valve is clean and free from any debris before installation. This will help ensure proper operation and reduce wear and tear over time. Additionally, be sure to check the inlet and outlet pressure levels of the system to confirm compatibility with the electric butterfly valve.

Finally, tighten all bolts ensuring that order assembly has been followed correctly to prevent potential leakage points when in operation. Following these tips can help ensure a successful installation process for your electric butterfly valve, increasing service life and reducing maintenance costs in the long run.

Proper torque setting

Proper torque setting is essential when installing an electric butterfly valve. The torque must be adjusted correctly according to the manufacturer’s specifications in order to ensure that the valve operates properly and safely. If the wrong torque is applied, the valve may not open or close properly, or worse, could cause a leak.

It is important to use a torque wrench when tightening bolts and nuts during installation in order to avoid problems down the line. Additionally, be sure to regularly check for any potential issues such as leaks or other signs of wear and tear that could result from improper torque settings. Taking these steps will help you maintain a safe and reliable electric butterfly valve for many years of reliable performance.

Thread lubrication for each material type

Thread lubrication is an important part of the installation process for any butterfly valve actuator. Depending on the material type, different lubricants should be used to ensure a tight and secure fitting. For example, metallic butterfly valves should use thread sealant such as PTFE tape or Teflon paste, while plastic valves should use silicone-based lubricants. Furthermore, all threads should be wiped clean before assembly and all excess lubricant should be removed after installation for optimal performance. Taking the time to properly lubricate threads during every butterfly valve installation will help ensure that the unit functions correctly and safely for many years to come.

Conclusion

Ultimately, selecting the right electric butterfly valve is a complex process that requires close attention. With the right knowledge and careful consideration of size, material type, pressure rating, actuator type, torque setting and thread lubrication for each material type you can ensure optimal performance and longevity in your system.

When properly installed and maintained, electric butterfly valves can provide great cost savings in energy efficiency over their lifespan. Taking the time to research, plan and carefully select the correct valve for your application can go a long way toward ensuring successful operation for the years to come.

Benefits of selecting the correct

Selecting the right electric butterfly valve for your system can have numerous long-term benefits. An efficiently designed, correctly installed and properly maintained electric butterfly valve can provide energy savings, reduce operational costs, improve system control and pressure management and provide extended service life with minimal maintenance requirements. When selecting the electric butterfly valve that best fits your application, consider its size, material types, pressure rating and electric actuator type in order to ensure optimal performance of your system. With proper selection and installation you can ensure years of reliable performance and cost savings.

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