What is a check valve used for?

Some common uses of check valves include:

1. Pump and compressor applications: Check valves are commonly used in pumps and compressors to prevent the reverse flow of fluid or gas when the pump or compressor is turned off.

2. Water treatment systems: Check valves are used in water treatment systems to prevent the backflow of treated water into the untreated water supply.

3. HVAC systems: Check valves are used in heating, ventilation, and air conditioning (HVAC) systems to prevent the backflow of air or water, which can cause damage to the system.

4. Fuel systems: Check valves are used in fuel systems to prevent the backflow of fuel, which can cause fires or explosions.

5. Process industries: Check valves are used in process industries such as oil and gas, chemical, and pharmaceutical manufacturing to prevent the contamination of products by backflow.

Overall, check valves are essential components in many systems where backflow can cause serious problems, and they play an important role in maintaining the safety and reliability of these systems.