Author:Site Editor Publish Time: 2018-10-18 Origin:Site
The swing check valve is also called a check valve, and its function is to prevent the medium in the pipeline from flowing backward. The valve of the opening and closing member is opened or closed by the medium activity and force to prevent the back flow of the medium from being called a check valve.
Swing-type check valve: A check valve that rotates around the pin shaft in the valve seat. The disc type check valve has a simple structure and can only be installed on a horizontal pipe, and has good sealing performance.The check valve is attributed to the active valve type and is mainly used on the pipeline in which the medium is unidirectionally movable, and only allows the medium to move in one direction to avoid the occurrence of the incident. This type of valve should normally be leveled in the pipeline.
The rotary check valve flap rotates around the rotating shaft, and its fluid resistance is usually smaller than that of the piston(lift) check valve. It is suitable for large diameter applications. The orientation of the device is not limited. It is usually installed in horizontal pipelines. Larger caliber occasions. According to the number of valve flaps, it can be divided into three types: single-lobed swing type, double-valve swing type and multi-lobed swing type. Single-lobed swing check valves are typically used with medium calibers. When the single-valve rotary check valve is used for the large-diameter pipeline, in order to reduce the water hammer pressure, a slow-closing check valve capable of reducing the water hammer pressure is preferably used. The double-valve swing check valve is suitable for large and medium diameter pipes. The double-grip swing check valve has a small construction and light weight, and is a relatively fast check valve; the multi-lobed swing check valve is suitable for large diameter pipelines.
Swing-type check valve is suitable for nominal pressure PN1.0MPa~42.0MPa, Class150-2500; nominal diameter DN15~1200mm, NPS1/2~48; working temperature -196~540°C for various pipelines, to avoid The media is reversed. After selecting different raw materials (WCB, CF8(M), CF3(M), 1Gr5Mo, 15CrMo1V, it can be applied to various media such as water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and urea. Oil, chemical, pharmaceutical, fertilizer, electricity and other pipelines.
The swing-type check valve is equipped with a rocker arm swinging 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 the sealing ring of the middle flange part, all There is no leak point, and it is possible to vent the valve. The swing-type check valve has a spherical joint structure at the joint of the rocker arm and the valve flap, so that the valve flap has a certain degree of freedom in a 360-degree scale, and has an appropriate micro-azimuth compensation. Suitable for clean media, not suitable for media with high solids and high viscosity.