In 2015, DONJOY carried out a comprehensive technical update of the check valve. After the upgrade, the check valve has a smaller dead angle, smaller flow resistance, and the valve core is sealed with full PTFE. Satisfied with automatic welding, the technology meets ASME BPE, 3-A-6800, EHEDG high clean technical requirements.
◎ Check valve is a valve that prevents fluid from flowing back, ensuring the uniqueness of fluid flow.
◎ It can be used to protect the loss of liquid back-up and prevent pipe blows.
◎ It is used in the food processing, beverage, brewing, refining, cosmetics, pharmaceutical and chemical industries.
Principle of operation
◎ When the pressure of the fluid is greater than the suction pressure of the spring, the valve opens. When the two pressures are equal, the valve closes. A more powerful differential pressure can also close the valve.
Design and features
◎Specification DN-25/1" to DN-100/4"
◎External structure and shaft AISI 316L/304
◎Spring AISI 304
◎ Washer EPDM according to FDA 117.2600
◎Surface treatment Ra ≤0.8 μm
◎The gasket has NBR, FPM (fluoro rubber) or PTFE, FDA117.2600 (optional)
◎welding, thread, clamp, DIN, SMS RJT, IDF, ISO, 3A
◎ Nominal pressure: 10 bar
◎ Opening pressure: 0.3bar (DN-25) 0.2bar (DN-32/40) 0.1bar (DN-50/100) (can choose higher opening pressure)
◎ Working temperature: -10 ° C to +130 ° C (EPDM)