1. When installing and commissioning a cast steel gate valve, it is essential to follow proper procedures and have trained professionals handle the process. Improper operation, such as excessive opening stroke or too much protection torque, can lead to issues like stem or stem nut jamming. To avoid this, set the opening position manually using the handwheel and adjust the torque accordingly. The recommended protection torque should be between 20% and 30%. If the closing stroke is too large, it may cause the gate to become stuck in the valve seat, leading to potential damage such as a broken stem or T-shaped groove on the gate. This could also result in the stem nut getting stuck, which may require costly repairs.
2. For high-pressure, large-diameter valves that are critical to the system, it's advisable to install a bypass system between the upstream and downstream sides. This helps reduce the pressure differential during operation, minimizes wear on the sealing surfaces, and lowers the required opening and closing torque. This not only improves performance but also reduces manufacturing costs and extends the service life of the valve.
3. Before installation, make sure the piping is thoroughly flushed to remove any debris such as metal shavings, welding slag, electrode remnants, or small nuts. These particles can scratch the sealing surfaces and compromise the valve’s integrity, leading to leaks or failure over time.
4. It is recommended to install the gate valve stem vertically upwards. Tilting the stem can increase the risk of the gate becoming stuck during operation. If horizontal installation is necessary, use a support bracket to ensure proper alignment and stability during the electrical actuation process.
5. Installing a safety valve in the middle cavity is an effective way to prevent abnormal pressure buildup, protecting the internal components of the valve and ensuring the system operates safely. Additionally, adding an external bypass between the upstream side and the middle chamber, or drilling a pressure relief hole on the upstream side of the gate, can further enhance system reliability and safety.
Yongjia Aoguang Valve Co., Ltd. specializes in manufacturing cast steel gate valves, power station gate valves, and other industrial valves. Our products are widely used across various industries and have earned consistent customer satisfaction. We welcome both new and existing customers to visit our official website to explore more product details and learn about our reliable solutions for your needs.
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