Check valves have a wide range of applications and play an extremely important role in water and even central heating installations. It is worth learning more about them and how they work. Today we will present you the top 5 best check valves.
What is a non-return valve used for?
Check valves they 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 work on the principle of pressure difference. If the threshold difference on the throttling element is exceeded, the valve opens, but after some time, when the flow stops, the valve closes. There are several types of check valves. We distinguish:
- poppet check valve - has a body with a socket and a mushroom-shaped closing element. It has a simple structure.
- ball check valve - it is equipped with a metal ball that rises until the medium flows in a set direction. If it changes gear, the ball falls on the socket and closes the pipe.
- diaphragm check valve - is equipped with a membrane that closes the flow if the direction of liquid flow 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.
Check out non-return valves at the Onninen wholesaler
Where is the non-return valve installed?
The check valve is usually installed directly downstream of 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 medium return point. The valves are mounted very easily and quickly using threads on the body or pipe sections. Please also note that higher differential pressure ranges may occur, but the valves have externally and internally threaded connections. The valve is installed in the direction of flow, and individual installation elements cannot press on its body. Remember that by sealing it, you cannot limit the pipe clearance.
How to choose a non-return valve?
The non-return valve must be selected correctly. Only then will it function properly and properly. You need to pay attention to the size here. It should be selected according to the diameter, e.g. of the suction port. If the pipe diameter is 1 inch, the valve must be the same diameter. Otherwise, the valve will not fulfill its function. You also need to take into account the type of medium, but also the flow characteristics and pressure losses.
TOP 5 best check valves
Check valve DN80, FIG.402 Zetkama
Noteworthy is the DN80, FIG.402 Zetkama check valve . It is made of cast iron. It is perfect for operating temperatures from minus 10 to 80 degrees Celsius. It is resistant to mechanical damage, loads and corrosion. It works well in places where the nominal pressure is 16 bar. Maintenance-free. 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 internal threaded check valve type 601 1/2" Socla . It is equipped with a mushroom closure. For greater work efficiency, it has a spring support. It is also worth paying attention to the material from which it is made, 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 pump installation against damage due to overheating.
Check valve with metal stem TIGER PLUS 1 1/4" Valvex
The TIGER PLUS 1 1/4" Valex check valve with a metal stem can operate at a maximum temperature of 120 degrees Celsius. It is worth paying attention to the really high operating pressure, which is up to 10 bar. The manufacturer used a sleeve that eliminates vibrations and noise, and also a mushroom head with a guide. The spring is made of corrosion-resistant stainless steel.
Check valve with spring TIGER brass 1 1/4" Valex
You can also choose a check valve with a spring TIGER brass 1 1/4" Valex made of brass. It has a strong and massive construction. This makes it resistant to mechanical damage and vibrations. It is also resistant to corrosion. It has an extremely ergonomic design , which ensures quiet operation and reliable operation.