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The humble check valve is one of the most important components of any pumping system or fluid moving application. The simple design belies its critical nature. Put simply, the check valve is the first line of defense against backflow which can cause serious problems for your pump and pumping system.Check valves are used in many different applications. For example they are often placed on the outlet side of a pump, to protect the pump from backflow. Centrifugal pumps, the most common type of water pumps, are not self-priming, and therefore check valves are essential for keeping water in the pipes.Check valves, or one-way valves, are designed to stop backflow and, ultimately, to protect pumps and compressors. They are available in several styles and sizes, from 1/8 inch to as large as may be required.
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Do all pumps need a check valve?
Check valves are used in many different applications. For example they are often placed on the outlet side of a pump, to protect the pump from backflow. Centrifugal pumps, the most common type of water pumps, are not self-priming, and therefore check valves are essential for keeping water in the pipes.
Why do pumps need check valves?
Check valves, or one-way valves, are designed to stop backflow and, ultimately, to protect pumps and compressors. They are available in several styles and sizes, from 1/8 inch to as large as may be required.
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Should a check valve be before or after pump?
The check valve must be installed at the outlet of the pump and in front of the outlet control valve for maintenance. Generally, the first outlet of the pump is the soft connection (shock absorber), the next is the check valve, and then the block valve.
Will a well pump work without a check valve?
With no check valve or if yours fails, the water in the drop pipe and system will flow back when the pump stops. This can cause the pump to rotate in the wrong direction as the water returns to the source.
Where should a check valve be installed?
Check valve can be installed in horizontal or vertical piping runs, with the flow running upward. Mounting for vertical installations is critical.
Can water backflow through a pump?
Flow reversal is a serious problem that can occur in piping systems with parallel pumps or in systems that pump uphill. When one or more pumps trip out of service, the loss in pressure can cause reverse flow to form based on the piping’s elevation, slope, flow resistance, and pressure differential.
Can you run a sump pump without a check valve?
Without a sump pump check valve in place, all the water in the discharge pipe empties back into the sump pump pit liner. This causes the water level in the liner to rise. Higher water levels in the sump pit liner causes the pump to run more often, increasing energy costs.
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Should you put a check valve on a sump pump?
If you do not have a Check Valve installed, it will cause your system to work much harder and more often to pump out the same amount. Installing one of these valves will drastically reduce the stress that is put on your pump and save energy by limiting the amount that the pump needs to run.
How far above sump pump should check valve be installed?
In submersible pump applications, the first check valve should be installed directly on the discharge head of the pump or maximum one pipe length (20 feet) above pump.
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Where should you put a check valve on a sump pump?
The most suitable location for a sump pump check valve is close to the floor level to minimize the volume of water that drains back at the end of each pumping cycle and it is a convenient location for easy servicing or replacement of the valve.
Should I install a check valve on my pressure tank?
If an additional check valve is required, it should be placed after the pressure tank to allow the pump and discharge pipe to remain pressurized. The check valve slamming shut from a full open position when the pump is cycling repeatedly is the main cause of check valve failure.
Do submersible pumps have a check valve?
Many submersible pumps come with a built-in check valve, however if this is not the case, a line check valve should be installed in the discharge line within 25 feet of the pump and below the draw down level of the water supply.
Does a pressure tank have a check valve?
The check valve on the well pressure tank is installed to allow the pressurized bladder to work by keeping the bladder from pushing the water back down to the pump in a submersible pump (most popular) type system.
How do you use a check valve on an air pump?
They come with an arrow or another mark to indicate which direction to place the valve in the line. The arrow should point in the direction of the airflow. When in doubt, blow through the check valve to verify which direction air will flow. Always keep extra check valves on hand, if one fails.
Where is the check valve on a shallow well pump?
The check valve should be installed in the suction side piping as close to the source of water as possible. It should not be installed within 2′ of the pump’s inlet, or anywhere on the discharge side of the pump.
Does pump go on flow or return?
The best place for the pump(s) is still on the flow side. This keeps the bulk of the system under positive pressure from a combination of the pressure imposed by the system water connection, and then when the pump is running, the pressure provided by the pump.
Do you need a backflow preventer on a sump pumps?
To guard against this, plumbing authorities generally require that homes with traditional water powered sump pumps install a Reduced Pressure Zone (RPZ) backflow preventer. These devices bring some complexities, however.
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Do diaphragm pumps need a check valve?
A diaphragm pump is a type of positive displacement pump consisting of one or more pumping chambers alternately filled and discharged by the movement of a flexible diaphragm with check valves on the inlet and outlet.
Can you have 2 check valves on a sump pump?
So with two check valves in parallel, you protect against the stuck-closed scenario (as it is unlikely that both check valves will fail in the same manner), but are actually more likely to have a stuck-open fault, since if either check valve fails open the discharge water can flow back into the sump well.
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