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Comprehensive Introduction of Industrial Gate Valves

Industrial Gate valve is a commonly used valve for closing or interrupting the flow of medium, with a simple and practical structure, widely used in various industrial fields. Gate valves are mainly composed of valve bodies, valve plates, valve stems, seals, and other components, which control the flow of the medium through the up and down movement of the valve plates. According to the different valve body structures and sealing surface forms, gate valves can be divided into flat gate valves, knife gate valves, and elastic wedge gate valves

 

Components Of Industrial Gate Valves

Components

Source: Linkedin

 

Types of Industrial Gate Valves

Different types of gate valves have their own advantages and disadvantages. For example, flat gate valves have a simple structure and good sealing performance, but have a large opening and closing force; Knife gate valves have good cutting performance, but poor sealing performance; The elastic wedge gate valve is easy to open and close, but the sealing surface is prone to wear. When selecting a gate valve, it is necessary to consider the specific usage scenario and medium characteristics comprehensively.

 

Choosing the Right Industrial Gate Valves

Generally speaking, the conditions suitable for using gate valves include small medium flow rates, large flow rate ranges, infrequent opening or closing times, and high requirements for sealing performance. For example, gate valves are commonly used in pipeline systems in industries such as chemical, petroleum, and natural gas.

The factors that need to be considered when using gate valves include medium characteristics, working pressure, temperature range, flow requirements, installation space, etc., to ensure the selection of appropriate gate valve models and materials.

Choosing the appropriate gate valve model and material requires comprehensive consideration of factors such as medium characteristics, working pressure, temperature range, flow requirements, installation space, etc.

The following are some specific guidelines:

Medium characteristics

Consider the fluid properties of the medium, such as its corrosiveness, viscosity, and particle content. For corrosive media, it is necessary to choose gate valves made of corrosion-resistant materials; For media containing particulate matter, it is necessary to choose wear-resistant gate valves.

Working pressure

Determine the rated pressure level of the gate valve based on the design working pressure, ensuring that the gate valve can withstand the working pressure within the system, while taking into account the pressure pulsation and impact of the system. Valves with different pressure levels have different design and strength requirements. Choose a gate valve pressure level that meets the system requirements.

Temperature range

Select the material of the gate valve based on the temperature range of the medium to ensure that the gate valve can operate normally under the expected temperature conditions, At the same time, “the thermal expansion coefficient” of the material should be considered (the thermal expansion coefficient refers to the proportional coefficient of linear or volumetric expansion of a substance when it changes in temperature.

Temperature range

Source: Baidu

The magnitude of the coefficient of thermal expansion depends on the properties of the material. Different materials have different coefficients of thermal expansion, such as metals, plastics, glass, etc. 

In engineering design, understanding the thermal expansion coefficient of materials is very important, especially in environments with high temperatures or significant temperature changes. For example, when selecting valve materials, it is necessary to consider the material’s thermal expansion coefficient to avoid problems caused by size changes caused by temperature changes And temperature resistance.

Flow requirements

Consider the flow requirements in the system, including maximum and minimum flow rates, and select the appropriate gate valve diameter and flow characteristics based on the system’s flow requirements to ensure that the gate valve can meet the fluid flow requirements of the system.

Operation method

Determine the operation mode of the valve, whether it is manual, electric, or pneumatic. Choosing the appropriate operating method can improve the sealing performance of the system: the sealing performance of the gate valve is crucial for the normal operation of the system. Choose a gate valve with good sealing performance to prevent leakage.

Maintenance requirements

Consider the maintenance requirements of the valve, including maintenance frequency and difficulty. Choosing gate valves that are easy to maintain can reduce system maintenance costs.

Material selection

Select appropriate valve materials, such as carbon steel, stainless steel, etc., based on the corrosiveness and temperature requirements of the medium.

Installation space

Considering the installation space limitations of gate valves, choose the appropriate gate valve model and structural form for the installation space to ensure that the gate valve can be easily installed and maintained.

When selecting gate valves, refer to the manufacturer’s product parameter table and technical manual for comprehensive analysis. Consulting professional valve engineers or technical support personnel can provide valuable advice and assistance.

By thoroughly considering factors such as medium characteristics, working pressure, temperature range, flow requirements, and installation space, gate valve models and materials suitable for specific engineering needs can be selected to ensure stable and reliable operation in practical use.

 

Common Faults of Industrial Gate Valves

Gate valves may face various malfunctions during operation, some common of which include:

Leakage

The sealing performance of the gate valve is crucial, but leakage problems may occur due to worn sealing surfaces, uneven sealing surfaces, or aging sealing components.

Blockage

The medium contains particulate matter, which may accumulate on the sealing surface or valve seat when the valve is closed, causing the valve to be unable to fully close or open.

Stuck

The valve may become stuck during the opening and closing process, resulting in inflexible operation. This may be caused by wear or impurities between the valve stem and valve seat.

Wear of valve seat and disc: Long term use may cause wear of valve seat and disc, reduce sealing performance, and increase leakage risk.

Handwheel or operating device malfunction

The handwheel or other operating device may fail due to damage, looseness, or other reasons, affecting the operation of the valve.

Material corrosion

The corrosiveness of the medium may lead to corrosion of the valve material, reducing the strength and durability of the valve.

Bent or broken valve stem

The valve stem may bend or break due to excessive use or external force, affecting the normal operation of the valve.

Insensitive operation

The operation of the valve may become slow or insensitive, which may be caused by insufficient lubrication of the valve stem, valve stem jamming, or malfunction of the operating device.

Temperature issue

Under extreme temperature conditions, valves may encounter issues with material expansion, contraction, or decreased sealing performance.

Excessive wear and tear

Long term use and frequent operation may cause excessive wear and tear on valve components, requiring timely replacement or maintenance.

Regular maintenance, inspection, and timely replacement of worn parts are crucial for gate valves to avoid these malfunctions. In addition, the correct selection and installation are also important factors to ensure the long-term reliable operation of gate valves.

 

Causes of Industrial gate valves failures and corresponding maintenance methods

Leakage issue:

     

      • Cause: Wear of sealing surface, unevenness of sealing surface, and aging of sealing components.

       

        • Repair method: Replace the sealing surface or components to ensure the sealing performance of the valve.

      Blockage issue:

         

          • Reason: The medium contains particulate matter that accumulates on the sealing surface or valve seat.

           

            • Repair method: Clean the inside of the valve, especially the sealing surface and valve seat, to ensure that the valve can open and close normally.

          Stuck issue:

             

              • Reason: Wear and impurities between the valve stem and valve seat.

               

                • Repair method: lubricate the valve stem, inspect and clean any impurities between the valve stem and valve seat.

              Wear issue of valve seat and disc:

                 

                  • Reason: Long term use leads to wear on the valve seat and disc.

                   

                    • Repair method: Replace worn valve seats and discs to ensure sealing performance.

                  Handwheel or operating device malfunction issue:

                     

                      • Cause: Damaged or loose handwheel or operating device.

                       

                        • Repair method: Repair or replace damaged handwheels or operating devices.

                      Material corrosion issues:

                         

                          • Reason: The corrosiveness of the medium.

                           

                            • Repair method: Select materials with good corrosion resistance, regularly inspect and replace corroded components.

                          Bending or fracture of valve stem:

                             

                              • Reason: Overuse or external force.

                               

                                • Repair method: Replace the bent or broken valve stem.

                              Unsensitive operation issue:

                                 

                                  • Reason: Insufficient lubrication of the valve stem, valve stem jamming, or malfunction of the operating device.

                                   

                                    • Repair method: Add lubrication to the valve stem, inspect and clean the valve stem, repair or replace the operating device.

                                  Temperature issue:

                                     

                                      • Reason: Under extreme temperature conditions, the material expands, shrinks, or the sealing performance decreases.

                                       

                                        • Repair method: Select materials that are suitable for high or low temperatures to ensure that the valve operates normally under extreme temperature conditions.

                                      Excessive wear and tear issue:

                                         

                                          • Reason: Long term use and frequent operation have caused excessive wear and tear on valve components.

                                           

                                            • Repair method: Regularly replace worn parts and perform preventive maintenance.

                                          In this blog, we delve into the types, selection factors, common faults, and their solutions of gate valves. Choosing the appropriate gate valve is crucial for the normal operation of industrial systems, and proper maintenance and upkeep will ensure the reliability and lifespan of equipment. We hope this blog provides you with valuable information.

                                          If you have any questions, opinions or experience sharing about gate valves, please feel free to leave a comment in the comments section. Thank you for taking the time to read this article. Looking forward to meeting you again in future discussions!

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