Sewer check valve - types of devices and their principle of
The sewage system is a complex of communications, the functioning of which depends on many factors, and any malfunction may pose a great danger to your property and the environment. Installing a check valve on the sewage system allows you to protect the system due to the fact that the device makes it possible to move wastewater in one direction only, so that even if a blockage occurs, the liquid will remain inside the pipes.
The principle of operation and versions of products
The design itself is designed to prevent sewage from entering the premises, since the liquid, when a blockage is formed in the system and deposits inside the pipes, tends to move along the path of least resistance.
The system is a fairly simple mechanism consisting of a membrane, a lever or another node that allows the movement of fluid in only one direction, and the housing, which is most often equipped with a lid for cleaning dirt.
Depending on the characteristics of the internal device, all products can be divided into the following groups:
- Interflange.
- Ball.
- Lifting.
- Swivel.
We will explore each of the options in more detail in the next chapter.
Also in the production can be used several types of materials, consider the features of each of them:
| Plastic | The easiest option, the price of which refers to the most budget decisions. The advantages include ease of installation with your own hands, since the product is equipped with all the necessary fastening assemblies, there are many options for pipelines with a diameter of 50 mm and 110 mm, and these dimensions are the main ones when working in private houses and apartments |
| Cast iron | More expensive, but also more durable option, which is most often used in industrial facilities. A very budget solution, which is used less and less every year due to the large mass and susceptibility to corrosion. |
| Bronze and Brass | A very attractive option for those who need high strength and resistance to aggressive effects, since these materials are practically not subject to corrosion. This solution is used less often than other options due to its significant cost, however, similar nodes can be found in many systems. |
| Stainless steel | Without a doubt, the most expensive, but also the most reliable option of all considered. The stainless steel is able to withstand virtually any substance and retains high performance properties throughout the entire period of use, which is several decades |
Features of the device for different types of products
As noted above, you can find different options for the composition of products, with each of the options has its own characteristics. Consider the most common types of check valves and see what is the difference between one or another option.
Wafer Valves
This type of device has the following distinctive features:
- Systems of this type for the most part have small dimensions and weight, which makes their installation and replacement quite convenient and fast. It is compactness that often plays a key role when choosing a specific option, as there is often a shortage of space, especially in small rooms.
- Another undoubted advantage is the presence of a configuration that is ready for fastening, because the nodes are fixed with flanges that must be purchased. In addition, there are a lot of variants of execution: plastic, cast iron, bronze, stainless steel.
- The most common option in private construction is disc valves in which a special membrane in the form of a disc holds the fluid, and instead of a lever a spring of appropriate rigidity is used so that the fluid flow can circulate only in one direction. A fairly simple system that is easy to maintain.
- The butterfly valves have their own characteristics: the system consists of two symmetric valves, which open only in one direction thanks to a special spring system, which serves as a limiter. Features of this system can be seen in the photo below.
Note! It is worth remembering that in the repair of products of this group, which is accompanied by the removal of the element, it is necessary to put a piece of pipe of appropriate length and diameter in its place so that the sewage operation is uninterrupted.
Rotary valves
This product group has the following features:
- The main working unit is a flap or spool mounted on the lever. The movement of water flow on one side raises the mechanism, and when the fluid dries out, the lever closes the cavity and prevents the fluid from returning to the system.
- For household communications with small volumes of sewage flows passing through, simple valve versions that act mechanically are most often used. This option has a big drawback: with significant, often interrupted fluid flows during closing, there is a high danger of a water hammer that can damage not only the valve, but also the entire system.
- A more perfect option is a shock-free mechanism, in which the return of the spool is made very smoothly, so that the hydraulic shock in the system will not occur under any circumstances. This solution has only one significant drawback: the rather high cost of products, which is not always justified when used in small systems.
Tip! Remember, whichever option you choose, it is very important that the seller provides you with documents confirming the quality of the product and its compliance with all regulatory standards set forth in the relevant acts. Otherwise, you risk acquiring a low-quality node that is unlikely to protect your system.
Ball valves
This option is one of the most widespread among private developers. An indicator of the reliability and durability of this solution is the fact that the ball assemblies are recommended for use by most professionals who are professionally involved in this type of work.
The advantages include the following factors:
- You will not have a problem, how to install a non-return valve on the sewage system - the direction of flow is indicated on the body, and you dispose of it as waste water will flow. This is very convenient for those who have no experience in carrying out such work, because no installation instructions are needed, everything is clear.
- Very simple design ensures high reliability and durability. The steel ball acts as a membrane, and the spring acts as a lever. Such a system is almost impossible to break and disable.
- In the case there is a cover on top, which is fastened with two or four bolts. Removing it, you can quickly clean the system from dirt and debris.
Lift valves
This solution also has a number of distinctive features:
- The main working unit is a vertical lift valve, which is equipped with a spring of a certain stiffness in order to allow the flow of fluid in only one direction.
- A big advantage is the ability to clean and repair the assembly without breaking the pipeline and the need to insert any elements. The system is very easy to maintain, but it is worth noting that such valves are more often polluted.
- Another plus is the possibility of choosing the best method of fastening, there are modifications that are installed using flanges, a threaded method, as well as using welding equipment.
It is important to choose the best option that is suitable for your system and for your operating conditions. Therefore, it is best to consult with professionals to make the best decision.
In addition, not one but two or more valves may be present in the system, again everything depends on the configuration of the pipelines.
Conclusion
If it is important for you to assemble a reliable system that will be protected from leakage in case of sewer blockages in pipes, then a check valve must be present in the communication system. The video in this article will tell some important features of the subject.