Check valves have a wide range of applications and play an extremely important role in water installations or even central heating. It is worth learning more about them and learning how they work. Today we will present you the top 5 best check valves.
What is a check valve for?
Check valves are responsible for maintaining the flow of the working medium, but in one direction. Their task is also to block the flow in the opposite direction. These are automatic devices, which means that there is no need to use control systems. They operate on the principle of pressure difference. If the threshold difference on the throttling element is exceeded, then the valve opens, while after a certain time, when the flow stops, the valve closes. There are several types of check valves. We distinguish:
- mushroom check valve - has a body with a socket and a mushroom-shaped closing element. It has a simple structure.
- ball check valve - is equipped with a metal ball that rises until the medium flows in a set direction. If it changes direction, the ball falls onto the socket and closes the pipe.
- diaphragm check valve - it is equipped with a membrane that closes the flow if the liquid flow direction changes.
- flap check valve - has a flap that is mounted on a lever. It should adhere to the ring in the body socket. This type of valve can be used horizontally and vertically.
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Where is the check valve installed?
The check valve is usually installed directly behind the pump. It should be located before the shut-off valve. Remember that the check valve is one of the most important elements of the water or central heating installation. It ensures proper operation, but also protects against potential damage. In some cases, the valve can be installed at the point of return of the medium. The valves are installed very easily and quickly using threads on the body or pipe sections. Also note that there may be higher pressure difference ranges, but the valves have externally and internally threaded connections. The valve is installed in the direction of flow, while individual installation elements cannot press on its body. Also remember that by sealing it, you cannot limit the pipe clearance.
How to choose a check valve?
The check valve must be properly selected. Only then will it function properly. Here, attention must be paid to the size. It must be selected according to the diameter, e.g. the suction nozzle. If the pipe diameter is 1 inch, the valve must have the same diameter. Otherwise, the valve will not fulfill its function. The type of medium must also be taken into account, as well as the flow characteristics and pressure losses.
TOP 5 best check valves
Check valve DN80,FIG.402 Zetkama
The DN80,FIG.402 Zetkama check valve is worth noting. It is made of cast iron. It will work perfectly in working temperatures from minus 10 to 80 degrees Celsius. It is resistant to mechanical damage, loads, and corrosion. It will work well in places where the nominal pressure is 16 bar. It does not require maintenance. It works well in any position and guarantees low pressure losses.
Internal threaded check valve type 601 1/2" Socla
Another practical and functional model is the Socla type 601 1/2" internal threaded check valve . It is equipped with a mushroom closure. For greater efficiency, it has spring support. It is also worth paying attention to the material it is made of, which is strong and reliable brass.
1" Ferro gravity differential valve
The 1" Ferro gravity differential valve is also cheap and reliable. It works even at high temperatures up to 110 degrees Celsius. It can work both vertically and horizontally. It has a rubber ball, which ensures more reliable operation. This type of valve does not require maintenance. It protects the pump installation from damage due to overheating.
Check valve with metal stem TIGER PLUS 1 1/4" Valvex
The TIGER PLUS 1 1/4" Valex metal stem check valve can operate at a maximum temperature of 120 degrees Celsius. It is worth noting the really high working pressure, which is as much as 10 bar. The manufacturer has used a sleeve that eliminates vibrations and noise, as well as a valve head with a guide. The spring is made of corrosion-resistant stainless steel.
TIGER spring check valve brass 1 1/4" Valex
You can also choose the TIGER brass 1 1/4" Valex spring check valve made of brass. It has a strong and massive construction. Thanks to this, it is resistant to mechanical damage, as well as vibrations. It is also resistant to corrosion. It has an extremely ergonomic design that ensures quiet operation and reliable operation.