Introduction to the principle: 

 The clamp check valve is also known as counterflow valve, check valve, back pressure valve and one-way valve. This kind of valve is automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, which is a kind of automatic valve. 

 The clamp 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℃, and is used to prevent the backflow of the medium. By selecting different materials, it can be used for a variety of media such as water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and urea. 

Standards and norms: 

 1. Design and manufacturing: API 594, API 6D, JB/T 8937; 

 2. Structure length: API 594, API 6D, DIN 3202, JB/T 8937; 

 3. Pressure-temperature level: 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 characteristics: 

 1. The structural length is short, and its structural length is only 1/4 to 1/8 of the traditional flange check valve; 

 2. Small in size and light in weight, its weight is only 1/4 to 1/20 of the traditional flange check valve; 

 3. The valve flap closes quickly, and the water hammer pressure is small; 

 4. Both horizontal pipes and vertical pipes can be used for installation; 

 5. The flow channel is smooth and the fluid resistance is small; 

 6. Sensitive to action and good sealing performance; 

 7. The valve flap stroke is short and the impact force of the valve is small; 

 8. The overall structure is simple and compact, and the shape is beautiful; 

 9. Long service life and strong reliability.