How to choose the right gate valve?

Professional guidance on choosing the right gate valve

Gate valve, as a common cut-off valve, is widely used in many industries such as petroleum, chemical industry, water conservancy, and electric power. The differences in performance, materials and structures make different gate valves suitable for various specific environments and working conditions.

Working condition analysis

1. Pressure and temperature: Different gate valve designs and materials determine their performance under specific pressures and temperatures. For example, in high-temperature and high-pressure environments, gate valves with excellent high-temperature and high-pressure resistance should be selected, such as metal-sealed gate valves, ball valve factory.
2. Fluid medium: The chemical properties of the fluid have strict requirements on the material of the gate valve. For corrosive media, stainless steel or specially coated gate valves should be selected.
3. Flow control: Where precise flow control is required, a gate valve with regulating function should be selected.

Material selection

1. Cast iron: suitable for low pressure, low temperature, non-corrosive media.
2. Carbon steel: suitable for high pressure, high temperature, and non-corrosive media.
3. Stainless steel: It has strong corrosion resistance and is suitable for a variety of corrosive media, wholesale gate valve.
4. Special alloy: for special working conditions, such as ultra-high temperature, ultra-low temperature, strong corrosion, etc.
structure type
5. Rising stem gate valve: The gate is raised and lowered by rotating the screw. It has a simple structure and is easy to maintain, but it is not suitable for underground pipelines.
6. Concealed stem gate valve: The lifting and lowering of the gate is driven by the internal screw. It has a neat appearance and is suitable for a variety of occasions.

Sealing performance

The sealing performance of the gate valve is directly related to its working efficiency and service life. Gate valves with good sealing performance, small friction coefficient and long service life should be selected. For example, gate valves with flexible graphite seals have higher sealing performance and longer service life.

1. Manual: suitable for small, low-frequency operations.
2. Electric: It can realize remote control and automatic operation, and is suitable for large-scale and high-frequency operations.
3. Pneumatic: Suitable for occasions requiring quick response, such as emergency shut-off systems, carbon steel gate valves.

Safety and reliability

When selecting a gate valve, its safety and reliability are indispensable considerations. Give priority to gate valve products that have been certified by authoritative organizations and have complete safety protection measures. For example, explosion-proof electric actuators, overload protection functions, etc.

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maintenance

When selecting a gate valve, its subsequent maintenance and upkeep should be considered. Give priority to products with simple structures and easy maintenance to reduce later operation and maintenance costs. In addition, for gate valves in harsh environments, products with better corrosion resistance and wear resistance should be selected to extend their service life.

Choosing the correct gate valve is a comprehensive process that requires comprehensive consideration of working conditions, materials, structures, sealing performance, actuators and driving methods, safety and reliability, and maintenance and repair. As an industry expert, you should make full use of various resources and technical means when making your selection to ensure that the selected gate valve can meet the needs of actual working conditions and has a high cost performance.