Where is the swing check valve used？

The valve disc of the swing check valve rotates around the rotating shaft. When the pipeline fluid flows in the specified direction, the inlet pressure of the valve disc is higher than the outlet pressure, the valve disc is pushed away from the valve seat, and the valve is in the open state. When the pressure difference on both sides of the valve disc decreases to a certain level, the valve disc falls and returns to the closed state, preventing the medium from flowing back. What are the occasions for the use of the swing check valve?

The fluid resistance of the swing check valve is smaller than that of the lifting check valve. It is suitable for occasions with larger diameters. The installation position is not restricted and it is usually installed in horizontal pipelines. According to the number of valve discs, it can be divided into three types: single-disc swing type, double-disc swing type and multi-disc swing type. Single-disc swing check valves are usually used in medium-caliber occasions. When a single-disc swing check valve is used for a large-diameter pipeline, in order to reduce the water hammer pressure, it is best to use a slow-closing check valve that can reduce the water hammer pressure. Double-disc swing check valves are suitable for large and medium-diameter pipelines. The double-flap swing check valve is small in structure and light in weight, and is a faster check valve; the multi-flap swing check valve is suitable for large-diameter pipelines.

The swing check valve is suitable for various pipelines with nominal pressure PN1.0MPa~42.0MPa, nominal diameter DN15~1200mm, and working temperature -196~540℃ to prevent medium backflow. It can be used for a variety of media such as water, steam, oil, nitric acid, acetic acid, strong oxidizing media and urea. It is mainly used in pipelines such as petroleum, chemical, pharmaceutical, fertilizer, and electricity.

The swing check valve is an internal rocker swing structure. All the opening and closing parts of the valve are installed inside the valve body and do not penetrate the valve body. Except for the sealing gasket and sealing ring used in the middle flange, there is no external leakage point, which also eliminates the risk of valve leakage. The swing check valve adopts a spherical connection structure at the joint between the rocker arm and the valve disc, which allows the valve disc to have a certain degree of freedom within a 360-degree range and has appropriate micro-position compensation. The swing check valve is suitable for clean media and is not suitable for media rich in solid particles and high viscosity.