Login

Your Name:(required)

Your Password:(required)

Join Us

Your Name:(required)

Your Email:(required)

Your Message :

0/2000

Your Position: Home - Valves - Control Valves Manufacturer China Control Valve Factory

Control Valves Manufacturer China Control Valve Factory

Author: Hou

May. 20, 2024

Control Valves Manufacturer China Control Valve Factory

Choice of Valve Type

For more information, please visit electric control valve from china manufacturer.

1. Determine the nominal pressure: Instead of using Pmax to cover the PN, find the corresponding PN from the table according to the conditions of temperature, pressure, and material, and ensure the selected valve meets the PN value.

2. Ensure the determined valve type's leakage meets process requirements.

3. The working pressure difference of the determined valve type should be less than the allowable pressure difference. If not, consider a special angle or select another valve.

4. The medium temperature should be within the operating temperature range of the valve, and the ambient temperature should meet the requirements.

5. Consider the valve's anti-blocking performance based on the medium's cleanliness.

6. Consider the valve's corrosion resistance according to the medium's chemical properties.

7. Consider the valve's erosion and wear resistance based on the pressure difference and medium containing hard objects.

8. Evaluate performance and price ratio considering comprehensive economic effects.

You need to consider three issues:

  • Simple structure (higher reliability with simpler structures), ease of maintenance, and availability of spare parts
  • Service life
  • Price

9. Optimal order of valve types:

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

Choice of Actuator

1. The simplest actuator is the pneumatic film type, followed by the piston type, and finally the electric type.

2. The main advantage of electric actuators is the convenient power supply, but they are expensive. Their reliability, waterproof, and explosion-proof capabilities are not as good as pneumatic actuators, so pneumatic types are preferred.

3. Old electric actuators are heavy and cumbersome, but there are now electronic, small, and highly reliable electric actuators (with higher prices).

4. Old ZMA and ZMB thin-film actuators can be replaced with multi-spring light actuators, improving performance and reducing weight and height by about 30%.

5. There are various piston actuator specifications, moving away from old, large designs to new, lighter structures.

Material Selection

1. The valve body pressure rating, operating temperature, and corrosion resistance should meet or exceed the process connection pipeline requirements. Manufacturer's finalized products should be preferred.

2. Cast iron valves are unsuitable for water vapor or wet gas with a lot of water and flammable and explosive media.

3. When the ambient temperature is below -20°C (especially in the north), cast iron valves should not be used.

4. In conditions of serious cavitation and erosion, select wear-resistant materials for the throttling sealing surface, like cobalt-based alloys or surface surfacing Stellite alloys, when the temperature is 300°C and the pressure difference is 1.5MPa.

5. For strongly corrosive media, select corrosion-resistant alloys based on the medium’s type, concentration, temperature, and pressure.

6. The valve body and throttling part should be treated separately. The throttling speed of the valve body wall is small, allowing a certain degree of corrosion. The throttling part, subject to high-speed erosion and corrosion, should have a corrosion rate of less than 0.1mm/year.

7. When selecting lining materials (rubber, plastic), ensure the working medium’s temperature, pressure, and concentration meet the material’s use range, and consider physical and mechanical damage to the valve during operation.

8. Vacuum valves should not have rubber or plastic linings in the valve body.

9. Two-position shut-off valves in water treatment systems should not use 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. The most versatile corrosion-resistant material is tetrafluoroethylene, known as the "corrosion-resistant king." Therefore, PTFE corrosion-resistant valves should be selected first, and alloys should be chosen only if unavoidable (e.g., temperature > 180°C, PN > 1.6).

Choice of Flow Characteristics

For preliminary selections, refer to special materials for detailed choices:

1. The logarithmic characteristic is selected when S > 0.6.

2. The logarithmic characteristic is chosen for small openings and when the unbalanced force changes greatly.

3. The required adjusted parameter reflects as a straight line when the speed is fast and as a logarithm when slow.

4. The linear characteristic is optional for the pressure regulation system.

5. The linear characteristic is optional for the liquid level adjustment system.

For more pfa line ball valves information, please contact us. We will provide professional answers.

Action Mode Selection

1. In foreign countries, it is common to indicate whether a valve should open or close under fault conditions (fault open and fault close), which is the opposite of the air open and air close designations used in China.

2. New light and fine small valves no longer emphasize the positive and negative effects of execution machinery, so they must be marked on the endnote.

Choice of Spring Ranges

1. First, select the spring range, then determine the working spring range.

2. Determining the working spring range involves calculating the output force to overcome the unbalanced force. If there are difficulties, provide the conditions (mainly the pressure difference when the valve is closed) to the manufacturer for assistance in calculating and adjusting the spring and the working range before leaving the factory.

Choice of Flow Direction

1. At the throttling port, the flow direction in the valve core's opening direction is flow opening, and in the closing direction is flow closing.

2. The choice of flow direction mainly applies to single-sealed regulating valves, including single-seat, angle, and single-sealed sleeve valves. It is based on the specified flow direction (e.g., double-seat valve, V ball) and arbitrary flow (e.g., O ball) designs.

3. For valves with diameter >15, flow is usually selected as open. For diameter ≤15, especially high-pressure valves, flow may be closed to improve service life.

4. Flow direction can be optionally open or closed for two-position switch valves.

5. If a flow-closed valve oscillates, changing it to flow-open can eliminate the issue.

Choice of Fillers

1. Commonly used fillers in regulating valves are Teflon "V"-shaped packing and graphite "O"-shaped packing.

2. Teflon packing has low friction but a short temperature range and shorter life; graphite packing has higher friction but better temperature resistance and longer life. Graphite packing is recommended for high-temperature valves and those with positioners.

3. If Teflon packing needs frequent replacement, consider switching to graphite packing.

Choice of Accessories

1. Main accessories for regulating valves include positioners, converters, relays, booster valves, position retaining valves, pressure reducing valves, filters, lubricators, travel switches, position transmitters, solenoid valves, and handwheel mechanisms.

2. Accessories play a supplementary role and ensure valve operation. Add only when necessary, since unnecessary accessories increase price and reduce reliability.

3. The main function of the positioner is to improve output force and action speed. If not needed, it is better not to include a positioner.

4. For fast response systems, a converter can be optional if the valve does not act quickly.

5. For strict explosion-proof environments, consider an electrical converter plus a pneumatic positioner.

6. Select reliable solenoid valves to prevent malfunction during required operation.

7. In important situations, avoid using handwheel mechanisms to prevent human error.

8. It is best to have the manufacturer provide and supply assembly on the valve to ensure reliable connection between the system and the assembly.

9. Provide the name, model, specification, input signal, output signal, etc., of the accessories when ordering.

10. Pay attention to the importance of these “small things,” especially reliability. If necessary, provide pneumatic components like solenoid valves.

How to Choose the Right Electric Butterfly Valve

Choosing the right electric butterfly valve for your application is essential for optimal performance. Consider factors such as size, material type, pressure rating, actuator type, and torque setting and thread lubrication for each material type. Understanding these components is critical to avoid problems down the road.

Introduction

When choosing an electric butterfly valve, it is important to understand its benefits and applications and consider factors such as size, material type, pressure rating, and actuator type. Proper installation requires precision regarding 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 optimal system performance.

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 various applications due to their unique design. Electric butterfly valves offer many benefits, including energy savings, cost savings, improved system control, pressure management, and extended service life. They are widely used in industries such as HVAC systems, wastewater treatment facilities, and oil refineries. 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, consider several factors. Size is crucial, as electric butterfly valves come in various sizes depending on your system. Material types used to construct the valve are also important. Choose a suitable material that meets your requirements. The pressure rating should also be considered to ensure optimal performance, as electric butterfly valves vary in range depending on their construction materials.

Finally, choose an actuator type based on your system needs and preferences. Common actuator types include pneumatic, hydraulic, and electric actuation. Considering these factors can help you select an electric butterfly valve that will provide long-term service with minimal maintenance.

Size and Material Type

Size and material type are essential factors in selecting an electric butterfly valve. The valve size depends on your system type, as different sizes are available for specific applications. Additionally, the construction material types will play a key role in the valve's lifespan and effectiveness. Common materials include stainless steel, chrome-plated brass, and plastic composites.

Each material has its benefits, so ensure you choose one that meets your requirements and is compatible with your application. Moreover, check the pressure rating to ensure it can handle your system's requirements for optimal performance. Careful selection of size and material type will help you invest in an electric butterfly valve that offers long-term service with minimal maintenance.

Pressure Rating

Pressure rating is a crucial factor when selecting an electric butterfly valve. This rating indicates the maximum pressure the valve can withstand without compromising performance or causing damage. The pressure rating is typically found on the manufacturer's specification sheets and should be considered 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, consult a professional for advice regarding appropriate pressure ratings to ensure you install a reliable and properly rated electric butterfly valve for optimal performance.

Actuator Type

Actuator type is another important factor when selecting an electric butterfly valve. There are two main types of actuators: pneumatic and electric. Pneumatic models use air pressure and are easier to install, while electric models typically require a more complex setup but provide greater accuracy and control over valve operation.

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

Tips for Installing an Electric Butterfly Valve

Installing an electric butterfly valve can be daunting, but several tips can help ensure a successful, safe, and efficient installation. First, determine the type of connection required for the installation. This could be threaded or flanged, depending on compatibility with your system.

Ensure the valve is clean and free from debris before installation. This helps ensure proper operation and reduces wear and tear over time. Additionally, check the inlet and outlet pressure levels of the system to confirm compatibility with the electric butterfly valve.

Finally, tighten all bolts, ensuring the correct assembly order to prevent potential leakage points during operation. Following these tips can help ensure a successful installation process for your electric butterfly valve, increasing its service life and reducing long-term maintenance costs.

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 to ensure proper and safe valve operation. If the wrong torque is applied, the valve may not open or close properly or could cause a leak.

Using a torque wrench when tightening bolts and nuts during installation is crucial to avoid future problems. Additionally, regularly check for potential issues such as leaks or wear and tear that could result from improper torque settings. 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 like PTFE tape or Teflon paste, while plastic valves should use silicone-based lubricants. All threads should be wiped clean before assembly, and any excess lubricant should be removed after installation for optimal performance. Properly lubricating threads during each butterfly valve installation ensures the unit functions correctly and safely for many years.

Conclusion

Ultimately, selecting the right electric butterfly valve is a complex process that requires careful consideration. Understanding and considering factors like size, material type, pressure rating, actuator type, torque setting, and thread lubrication for each material type ensures optimal performance and longevity in your system.

Properly installed and maintained electric butterfly valves can offer significant cost savings in energy efficiency over their lifespan. Taking the time to research, plan, and carefully select the correct valve for your application is crucial for ensuring successful operation for years to come.

Benefits of Selecting the Correct Valve

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 extend service life with minimal maintenance requirements. Consider the valve's size, material types, pressure rating, and actuator type to ensure optimal system performance. With proper selection and installation, you can achieve years of reliable performance and cost savings.

Are you interested in learning more about high pressure control valve China? Contact us today for expert consultation!

212

0

Comments

0/2000

All Comments (0)

Guest Posts

If you are interested in sending in a Guest Blogger Submission,welcome to write for us!

Your Name (required)

Your Email (required)

Subject

Your Message (required)

0/2000