Wafer check valve
is also known as reverse flow valve, check valve, back pressure valve and one-way valve. This type of valve is automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, and belongs to an automatic valve. The check valve is used in the pipeline system, and its main function is to prevent the backflow of the medium, the reverse rotation of the pump and its driving motor, and the discharge of the medium in the container. Check valves can also be used on lines supplying auxiliary systems where the pressure may rise above the main system pressure. Check valves can be applied to pipelines of various media according to different materials. The check valve is installed on the pipeline and becomes one of the fluid components of the complete pipeline. The opening and closing process of the valve disc is affected by the transient flow state of the system in which it is located; in turn, the closing characteristics of the valve disc are It has an effect on the fluid flow state. Wafer check valve is suitable for various pipelines with nominal pressure PN1.0MPa～42.0MPa, Class150～2500; nominal diameter DN12～1200mm, NPS1/2～48; working temperature -196～540℃. Medium backflow. By choosing different materials, it can be applied to various media such as water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and urea. Standards and specifications 1. Design and manufacture: API 594, API 6D, JB/T 8937; 2. Structure length: API 594, API 6D, DIN 3202, JB/T 8937; 3. Pressure-temperature class: ANSI B 16.34, DIN 2401, GB/T 9124, HG 20605, SH 3406, JB/T 74; 4. Test and inspection: API 598, JB/T 9092; 5. Piping flange: JB/T 74～90, GB/T 9112 ～9124, HG 20592～20635, SH 3406, ANSI B 16.5, DIN 2543～2548, GB/T 13402, API 605, ASME B 16.47. Structural features 1. The length of the structure is short, and its structural length is only 1/4 to 1/8 of the traditional flange check valve; 2. The volume is small and light, and its weight is only 1/4 to 1 of the traditional flange check valve. /20; 3. The parallel valve closes quickly, and the water hammer pressure is small; 4. The horizontal pipeline or vertical pipeline can be used, in terms of installation; 5. The flow channel is smooth and the fluid resistance is small; 6. The action is sensitive and the sealing performance is good; 7. The valve disc stroke is short and the impact force of closing the valve is small; 8. The overall structure is simple and compact, and the appearance is beautiful; 9. The service life is long and the reliability is strong;
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