The filling valve for the central heating installation, also called the central heating filling valve or the installation filling valve, is an important element in the heating system. Its main function is to supply water to the central heating system to enable the entire system to function properly. How does this filling valve work? Check out the article!
Check the filling valves at the Onninen wholesaler
How does the filling valve work?
The filling valve for a central heating installation is a key element that allows controlled filling of the installation with water and maintaining the appropriate pressure in the heating system. The main function of this valve is to supply water to the central heating system. When the system is first started or after the installation is topped up with water (e.g. after replacing a system part or after a period of inactivity), the filling valve is opened, allowing water to flow into the heating system. Water fills the entire system, including pipes, radiators and other components, preparing it to function properly.
The filling valve is equipped with pressure regulation mechanisms that allow you to control the amount of water supplied to the installation. This allows you to maintain the appropriate pressure in the heating system, which is crucial for its effective and safe operation. Filling valves are also equipped with mechanisms 
safety devices that protect the installation against excessive water filling. Once the appropriate filling level is reached, the filling valve automatically closes to prevent further water inflow.
Some filling valves are equipped with pressure gauges that allow the user to monitor and control the pressure in the system. This allows you to quickly notice any changes in pressure and take appropriate action. It is also important that the filling valve is appropriately selected for the needs of a specific central heating installation and is installed in accordance with the rules and safety requirements. Thanks to the proper operation of the filling valve, the central heating system will operate effectively, providing heat to all rooms in the building.
How to fill the central heating system?
Regularly replenishing the central heating system is crucial for the proper functioning of the entire system. At the same time, the observed deficiencies provide information about a possible leak. How to carry out the whole process?
The first step is to turn off the central heating system and then locate a special point for filling. Please remember to close all valves in a given circuit to ensure accurate and even filling.
The water entering through the filling valve should not exceed the specified technical standards. Hissing coming from the tank may be a signal that the structure is filling and pressure stabilizing manipulations are starting.
TOP5 best filling valves
We already know that the filling valve has an extremely important function. That's why we have prepared a ranking of the best products!
Afriso FAM filling valve with pressure gauge
The Afriso FAM filling valve with pressure gauge has a pressure limiter, a non-return and shut-off valve and a pressure gauge. This will allow you to use the valve more efficiently. Additionally, the valve has a GW connection, and the maximum temperature in the central heating pipes is 90 °C
Resideo Braukmann filling valve with GW 1/2"/GZ3/4" connection
The Resideo Braukmann VF 06 filling valve is designed for filling and topping up closed heating installations with water. The valve includes a pressure regulator, a non-return valve and a shut-off valve. The design of the valve allows the installation of a pressure gauge to measure and control the pressure on the installation side. The use of VF06 allows you to avoid damage that may occur as a result of excessive pressure when filling the installation.
Filling valve SYR 2128 3/4"
The SYR 2128 3/4" filling valve is intended for closed drinking water heaters and tanks. It consists of a shut-off valve, a non-return valve with a control connector, a connector for connecting a pressure gauge, and a 2115 safety valve (replaceable stainless steel seat) with a discharge basket. Thanks Due to these parameters, the use of this valve will work well in a central heating installation.
Ferro ZN15 1/2" filling valve
The Ferro ZN15 1/2" filling valve is a reliable device with outlet pressure regulation (1-4 bar), maximum inlet pressure (10 bar) and maximum operating temperature (80°C). It has a 1/4" pressure gauge connection and is easy to use. easy to install thanks to the screw connection. This is the perfect solution for comfortable and safe filling of heating installations.
Flamco Flexcon PA AutoFill filling valve
The Flamco Flexcon PA AutoFill filling valve keeps records and alerts when pressure problems occur and helps set and control the correct system operating pressure. The assistant also informs about the expected service life of the expansion vessel without disconnecting it, and the user can configure maintenance interval monitoring for third-party components. This will make it even easier to detect potential problems in the central heating system.