Generally, placed close to the supply discharge of the pump.
after gate valve, because when you want make maintenance for sump pump , you don't want all water in the pipe drop down sump pump - gate valve - non return valve
It keeps the water that is pumped out from flowing back into the sump when the pump shuts off. Most sumps discharge several feet above the hole the pump sits in. If there was not a check valve the sump would just refill and pump out the water over and over.
centrifugal pump should be fill with liquid to built discharge pressur.chemist.yasser.Naguib
check valve
You connect the discharge side of the pump with PVC pipe to the inlet side of the filter or back wash valve. For above ground pools this is usually done with a section of ribbed hose.
Fuel pump check valve is on the pump in the tank. vacuum check valve is in the line going through the firewall.
A sump pump discharge line should run as far from the foundation walls as possible.
The flow back check valve is in the pump.
since check valve holds water in the line can a hand pump be installed between the check valve and water tank?
An air pump check valve comes in a variety of sizes. This type of valve can be purchased for about 12 dollars to about 40 dollars depending on the size required.
A foot valve, in relation to a water well, is a check valve at he bottom of a well to keep the water from running back into the well from the pump when the pump is not running. If the check valve does not hold the water the pump will lose it's prime and will not pump water.