Sandwich valves are specialized valves that are used in hot-tapping applications to provide a safe and reliable solution for creating a branch connection on a live pipeline. Hot-tapping involves drilling into a live pipeline to create a branch connection, and the use of sandwich valves is essential to ensure safe and efficient operations.

The sandwich valve is designed to fit between two flanges on a pipeline and creates a temporary isolation point for the hot-tapping process. It features a gate that opens and closes to allow or block the flow of fluid through the valve, and a bonnet that covers the gate and provides additional sealing. The valve is designed to withstand high pressure and temperature and is made from high-quality materials such as carbon steel, stainless steel, or ductile iron.

The hot-tapping process using sandwich valves involves cutting into the live pipeline and installing the valve between the two flanges. The valve is secured in place using bolts and nuts, and a drilling machine is used to create a branch connection through the valve. The valve gate is then opened to allow the flow of fluid through the new branch connection.

The use of sandwich valves in hot-tapping applications offers several advantages. It allows for the creation of a branch connection on a live pipeline without the need for a complete shutdown, reducing downtime and increasing productivity. The valves are designed to withstand high pressure and temperature, ensuring safe and reliable operation in critical pipeline applications.

Additionally, sandwich valves are available in various sizes and configurations to suit different pipeline applications. They can be manually or pneumatically operated, depending on the requirements of the pipeline operation.

In conclusion, the use of sandwich valves in hot-tapping applications provides a safe and reliable solution for creating a branch connection on a live pipeline. They are designed to withstand high pressure and temperature and are available in various sizes and configurations to suit different pipeline applications. The installation of the valve requires specialized equipment and experienced technicians, and the valve is secured in place while the pipeline remains under pressure. The use of sandwich valves in hot-tapping operations offers several advantages, including reduced downtime and increased productivity.

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