A check valve that prevents backflow:


What is a non-return valve (NRV) or check valve?

Self-acting valves called check valves or non-return valves are used in piping systems to stop flow reversal. To put it another way, check valves are essentially backflow preventers. Even if a plant loses its electricity, air supply, or hydraulic power source, Valve Check keeps running. Even these one-way valves or flow preventers operate without the help of an operator.


What Functions a Check Valve?

The material passing through the pipeline opens the check valves. This fluid in the pipeline could be gas, water, air, oil, or steam. The check valve is opened by the pressure of the fluid moving through the system, and it is closed by any flow reversal. In order to allow flow in one direction, the check valve disc is essentially lifted or swung open during valve opening. The weight of the check mechanism, back pressure, a spring, or a combination of these methods can all be used to close a check valve to prevent backflow.


Why do we employ one-way valves, non-return valves, or check valves?

For operational safety, the flow must be unidirectional because reverse flow can occasionally be harmful to machinery or a process. Valve check is how this operational safety is achieved. Valves are self-operating, self-actuating mechanisms.


  • Check valves are used to safeguard machinery susceptible to damage from reverse flow, including flow metres, strainers, and flow control valves.


  • Check In order to prevent pressure surges brought on by hydraulic pressures like water hammer, valves are utilised.


  • Check In order to avoid floods, valves are utilised to prevent flow reversal.


  • When a system shuts down, check valves are utilised to stop the reverse flow.


  • Check valves are employed to stop flow caused by gravity.


  • Check Vacuum situations are relieved via valves.

Basic Check Valve Types



Understanding the numerous valves used in the mechanical sector is crucial for HVAC mechanical engineers.



Different types of check valves have been created to meet the varying needs of piping systems in diverse applications.



These diverse check valve types come with a number of benefits and drawbacks.



A check valve that works well in one application might not be appropriate in another.



The type of valve that would be used in that specific application is a decision that plant engineers must make after considering a number of different considerations.



The primary check valve types utilised in diverse applications are listed below.
  1. Tilting Disk for Swing 
  2. Check Valves Lift 
  3. Check Valves, 
  4. Piston Check Valves 
  5. Examine Valves
  6. Butterfly Stop Check Valves 
  7. Other types of check valves (Ball check valve, diaphragm check valve etc)





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