An efficient flush is one of the most important devices in the home. Its failure is troublesome, but in many cases you can repair the cistern yourself. The fault is usually caused by a worn water fill valve or drain valve. All you need to do is diagnose the fault and buy the broken components. How does the cistern filling valve work? What elements does it consist of? What should you remember when buying a float valve to fit a specific cistern model? We explain and advise.
Check the filling valves at the Onninen wholesaler
What is a filling valve?
The filling valve, together with the drain valve, forms the internal mechanism of the cistern. It consists of elements such as a valve, a float and a screw adjusting the float height, which is why it is also called a float valve. Proper setting of the float regulates the operation of the valve. Most valves supplying water to the cistern have the function of regulating the amount of water and the drain pressure, which allows you to save on water bills and at the same time clean the toilet bowl thoroughly. Currently, most valves used in hydraulics have the ability to limit the amount of water drawn to 3 and 6 liters. The water pressure is regulated using orifice rings mounted in the cistern basket. The larger the diameter of such a sleeve, the greater the water pressure. In turn, smaller rings save the amount of water and, consequently, the amount of bills.
Depending on the type of cistern, there are several types of filling valves:
- filling valves for external cisterns;
- filling valves for concealed sets;
- filling valves with 1/2 inch connection thread;
- filling valves with 3/8 inch connection thread.
What is the function of the filling valve in the cistern?
The purpose of the connection valve 
water is automatically filled in the cistern after pressing the trigger button and water flows into the bowl. Filling and draining valves operate thanks to the force of gravity and water buoyancy. If the cistern does not draw water, the filling valve is damaged. When water is drawn in but leaks into the bowl, or worse yet, flows out from under the cistern cover, the reason is that the float level is set too high. If, after turning off the water supply to the cistern, water still flows into the bowl, the drain valve in the cistern is damaged. If the cistern does not take in water or the water flows into the bowl, it does not mean that it is all empty 
the cistern needs to be replaced. Most often, it is enough to replace the filling or drain valve, and sometimes it is enough to clean them of sediment and accumulated impurities and then reassemble them.
When purchasing a new filling valve, it is worth choosing a model from the same manufacturer as the cistern, matched to its type and model. If this is not possible, you need to match the type of valve to the type of cistern, water inlet mounting (side or top) and the diameter of the hole in the cistern for the connection thread, i.e. ½ inch or 3/8 inch. Some valves come with both types of threads, so that the valve fits any hole.
Filling valves at the Onninen wholesaler
On the Onninen wholesale website you will find many models of cisterns, both ceramic and plastic, with a set of valves, mountings and inlet hoses. Our offer also includes many types of filling valves, so that every customer buys what he needs and is satisfied with the purchase. Below we present the most popular models of filling valves: 
- Alcadrin universal filling valve with side feed and metal tip and thread diameter ½ and 3/8 inch. It has 2 tips included, so it fits cisterns of various diameters. It works great even when the water pressure in the installation drops. Moreover, it is one of the quietest filling valves.
- Alcadrin universal filling valve with side feed, PVC tip and ½ and 3/8 inch thread diameter. Fits ceramic cisterns with side water inlet. It has 2 tips included and a dirt-catching filter. It has great customer reviews due to easy installation and quiet operation.
- Filling valve Type 333, 3 / 8" MS with a threaded brass nipple. Intended primarily for Geberit surface-mounted ceramic cisterns with a 3/8 inch hole. The valve is made of brass and strong material, it works well even with intensive use in sanitary facilities in public places.
- Geberit Type 380 filling valve for concealed cisterns. Valve compatible with Geberit concealed sets with side water inlet and 3/8 inch hole. The replacement takes place through the inspection hole after removing the panel under the water drain buttons.
- Geberit Type 333 filling valve, 1/2" MS . Designed for Geberit surface-mounted cisterns with side water inlet and 1/2 inch opening. The valve is made of strong material and the tip is made of brass, thanks to which the mechanism works flawlessly even with intensive use. .
Filling valves, hydraulic fittings and the entire range of Onninen wholesalers are products of well-known and respected brands on the market, whose products operate without failure for a long time.