Views: 0 Author: J-VALVES Publish Time: 2022-04-30 Origin: Site
In industrial fluid systems, CHECK VALVES and BUTTERFLY VALVES are two common types of valves, each with its own unique functions and application scenarios. Selecting the appropriate valves is crucial for ensuring the safe and efficient operation of the system. This article will compare the key points for selecting check valves and butterfly valves from three aspects: pressure, temperature and material, to help you make a wise choice in practical applications.
I. BASIC FUNCTIONS OF CHECK VALVES AND BUTTERFLY VALVES
The main function of a check valve is to prevent the reverse flow of fluid and protect the system from damage caused by water hammer and backflow. Butterfly valves, on the other hand, are mainly used to control the flow rate and direction of fluid, featuring quick opening and closing as well as good regulating performance.
II. COMPARATIVE ANALYSIS OF PRESSURE, TEMPERATURE AND MATERIAL
The following is a detailed comparison of check valves and butterfly valves in terms of pressure, temperature and material:
Characteristics | ||
Pressure Range | Lift check valve: Applicable to medium and small diameter pipelines, with a nominal pressure range of 1.0 - 32 MPa | General butterfly valve: Has a relatively wide nominal pressure range, covering from low pressure to medium and high pressure, such as PN0.6 - 4.0 MPa |
Temperature Range | Lift check valve: Has a relatively wide working temperature range, such as from -196 °C to 550 °C | Ordinary butterfly valve: The working temperature range is generally from -20 °C to 200 °C |
Material Selection | Common materials include cast iron, ductile iron, carbon steel, stainless steel, alloy steel, etc. | Common materials include cast iron, ductile iron, stainless steel, aluminum alloy, etc. |
III. SELECTION SUGGESTIONS
(1) Selection According to Pressure
• Check Valves: If the system pressure is relatively high (for example, exceeding 32 MPa), it is recommended to choose a swing check valve, which has stronger pressure resistance.
• Butterfly Valves: For medium and low pressure systems, ordinary butterfly valves can meet the requirements. If the system pressure is high, a high-pressure butterfly valve should be selected.
(2) Selection According to Temperature
• Check Valves: For high-temperature working conditions (such as exceeding 300 °C), the swing check valve is a better choice as it has a wider working temperature range.
• Butterfly Valves: Ordinary butterfly valves are suitable for normal temperature or lower temperature environments. If it is necessary to use them at high temperatures, it is recommended to choose high-temperature butterfly valves.
(3) Selection According to Material
• Check Valves: If the medium is corrosive, it is recommended to choose check valves made of stainless steel or alloy steel.
• Butterfly Valves: For corrosive media, stainless steel butterfly valves are the ideal choice. If cost is limited, cast iron butterfly valves can be chosen, but it is necessary to ensure the compatibility of the medium.
IV. SUMMARY
CHECK VALVES and BUTTERFLY VALVES each have their own advantages in industrial applications. Check valves are mainly used to prevent fluid backflow and are suitable for high-pressure, high-temperature and corrosive medium environments. Butterfly valves focus more on flow control and quick opening and closing and are suitable for medium and low pressure and normal temperature environments. When selecting valves, it is necessary to comprehensively consider the pressure, temperature and medium characteristics of the system, and choose the appropriate valve types and materials to ensure the safe and efficient operation of the system.
