Why foot valves are provided in the suction line in Centrifugal pump?

The foot valve is a lift check valve which is usually installed together with suction strainers in the suction line. It prevents the suction line from running empty after the pump is stopped (also see Valve).

Why do positive displacement pumps have relief valves?

Relief valves can be an important measure when used within positive displacement pumps. These valves divert fluid flow as pressure builds in the discharge line of the pump, preventing failure.

Why does Centrifugal pump not have relief valve?

A relief valve is not necessary for a Centrifugal pump because maximum pressure with the discharge closed is only moderately above working pressure.

Why NRV is provided in pump discharge?

Consequent upon power trip off to a pump-motor pump discharge decelerates and sets up a down surge in a pumping system. A non-return-valve (NRV) restricts flow reversal in the system and ultimately keeps water hammer at a lower magnitude. …

What is the purpose of a foot valve?

Overview: A foot valve is a type of check valve that is typically installed at a pump or at the bottom of a pipe line (hence the name). Foot valves act like ball check valves, but have an open end with a shield or screen over it to block debris from entering the line.

Why do we use foot valves?

Use foot valves when you have situations that need a pump, such as when water needs to be extracted from an underground well. Foot valves keep the pump primed, allowing water to flow in, but not letting it flow back out, making them ideal for use in pools, ponds, and wells.

What are the characteristics of a centrifugal pump?

A centrifugal pump converts driver energy to kinetic energy in a liquid by accelerating the fluid to the outer rim of an impeller. The amount of energy given to the liquid corresponds to the velocity at the edge or vane tip of the impeller.

Where is the NRV in the pump pipe line?

All Answers (2) 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.