What is a non-return valve for in a washing machine?
A non-return valve, or anti-siphon, is a part of the drainage system that prevents water from entering the machine from the sewer pipes. The part is usually made of durable plastic. It is connected to the drain hose. It is included with most modern washing machine models, but sometimes you have to purchase it yourself. What is a check valve for and how to install it?
Valve purpose
Answering the question why an anti-siphon is needed, the experts note: the need for installation does not always arise. It may not be used if the device is connected to the sewer system and meets all technical requirements. Installation of a check valve is required in two cases:
when inserting into the drainage system. When the machine is connected to a sink siphon, a “siphon effect” may occur from time to time as waste water flows into the washing machine.
if it is impossible to place the drain hose of the machine at a sufficient height. In such a situation, a “siphon effect” cannot be ruled out either.
Important! The drainage hose must be at least 50 cm above the sewer level.
Only under this condition it is easy to do without connecting a check valve. Waste water does not enter the machine.
How does the valve function?
The principle of operation of the anti-siphon is as follows: when dirty water is drained, the valve opens under its pressure and the liquid easily passes through it. When the water runs out, the pressure drops. The check valve closes itself, without outside help, eliminating the flow of dirty water from the sewer pipes.A ball-shaped piece of polypropylene works as a locking mechanism. There are different types of antisiphons for washing machines.
Collapsible. The part can be easily disassembled and cleaned if clogged. Such valves are often installed where the water is hard.
Non-separable. The most common model. It is made of plastic, so its cost is low.
For sink siphon. The name of the valve speaks for itself; it is installed in the siphon where the sink is installed.
Mortise. To be integrated into the sewer system, the part is cut into the pipeline.
There are also wall valves. Their cost is the highest among all the varieties presented. At the same time, they have a more aesthetic appearance.
How to install the valve?
When installing a check valve yourself, it is important to take into account the design features of the model. However, the general rules for connecting all types of antisiphons are identical. A check valve is a complex tube. The diameters of the exits from it are different. One side of the part is mounted in a sewer pipe or siphon. The other is attached to the drain hose of the machine.
Both connections must be carefully sealed to prevent leaks. These actions are quite enough to prevent water from the sewage system from entering the washing machine.
A non-return valve, or anti-siphon, is a part of the drainage system that prevents water from entering the machine from the sewer pipes. The part is usually made of durable plastic. It is connected to the drain hose. It is included with most modern washing machine models, but sometimes you have to purchase it yourself. What is a check valve for and how to install it?
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