Industrial pipeline manual flange gate valve cast steel stainless steel globe shut-off valve

Description :

  Gate valve is a type of opening and closing valve mainly used to cut off or connect the medium in the pipeline. Its core function is to achieve full opening or full closing of the fluid channel through the vertical lifting and lowering of the gate plate. This category is widely used in industrial pipeline systems such as petroleum, chemical, power, metallurgy, and urban water supply and drainage. It is particularly suitable for working environments that require low flow resistance, bidirectional flow, and do not require frequent flow regulation. As a fundamental and critical pipeline control component, gate valves can effectively isolate media, ensure safe maintenance and stable system operation, and are indispensable cutoff devices in various fluid transportation systems.

  The structural forms of conventional gate valves mainly include two types: open stem and concealed stem. The connection method is mostly flange connection, and threaded or clamp type structures can also be provided according to demand. The valve body material is usually selected from WCB cast steel, CF8/CF8M stainless steel or cast iron to meet the requirements of different pressure levels (such as PN1.6-PN4.0) and temperature ranges (-29 ℃ to 425 ℃). The sealing surface material is often made of hard alloy, stainless steel, or polytetrafluoroethylene to ensure good sealing performance. The manufacturing process strictly follows domestic and international standards such as GB/T 12234 and API 600. Before leaving the factory, strict pressure testing and sealing inspection are required to ensure the reliability and durability of the product under high pressure differentials.

  When selecting, it is necessary to clarify the properties of the medium (such as corrosiveness, viscosity), working pressure, temperature, and installation space limitations. For large-diameter pipelines, it is recommended to use elastic seat sealed gate valves to reduce operating torque; For high temperature and high pressure conditions, rigid wedge gate valves are recommended. It should be noted that gate valves are not suitable for throttling regulation, and their semi open state can easily lead to erosion damage to the tight cover and vibration noise. If flow regulation is required, priority should be given to globe valves or ball valves. In addition, for media containing particulate impurities, discharge type gate valves or filters should be selected to prevent impurities from blocking the gate and affecting the tightness of the closure.

  When installing gate valves, attention should be paid to the flow direction of the medium. Although there are no strict restrictions, it is recommended to install them in the direction indicated on the valve body for ease of maintenance. For gate valves that are in an open state for a long time, the handwheel should be rotated slightly regularly to prevent thread biting. In daily maintenance, it is necessary to check whether there is any leakage in the packing box, and promptly tighten or replace the packing; Keep the valve stem clean and regularly add lubricating grease to ensure flexible opening and closing. If internal leakage is found, it is often due to damage to the sealing surface or inclusion of foreign objects, and it needs to be disassembled, ground or cleaned. Proper and standardized operation and maintenance can significantly extend the service life of gate valves, reduce system failure rates, and ensure the continuous and stable operation of pipeline systems.

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