Is a check valve the same as a non-return valve?

A non-return valve, also known as a check valve, clack valve, one-way valve or retention valve, is designed to allow fluid to flow in one direction only, therefore preventing the liquid or gas from flowing back upstream of the valve.

Does PVC check valve reduce water pressure?

Check valves do not reduce pressure, they actually help maintain it. In the setup you describe, it might work. However you will DEFINITELY need another check valve on the outlet of the tank to prevent the high pressure flow from backwashing in through the bottom, since there is no shuttoff/float valve there.

Where do you place a non-return valve?

The valve could be a source of a transient flow leading perhaps to severe pressure waves, NRV should be installed directly downstream of the pump in order to protect the pump from any damage due to the consequences of any generated surge pressures.

What kind of pump needs a non-return valve?

self-priming pumps
Non-Return Valves are essential to use with self-priming pumps, for suction lifting and for use with pressure switches. They hold the prime in the pump to avoid having to re-prime for every use and to avoid cavitation (dry running) in the pump.

Can a non-return valve be opened manually?

NRVs are also a type of two-port valve as they feature two openings in the body; one for fluids to enter and the other for them to leave. Non-return valves typically work automatically, meaning they do not require to be operated manually by a person or external control.

Does a double check valve reduce water pressure?

It consists of two check valves assembled in series. This employs two operating principles: firstly one check valve will still act, even if the other is jammed wide open. Secondly the closure of one valve reduces the pressure differential across the other, allowing a more reliable seal and avoiding even minor leakage.