How to choose and install a sewer ladder? Dry shutter - the best protection against the penetration of unpleasant odors from the sewer. What does "dry shutter" mean.

"Dry ladder" is a siphon for drains of shower rooms and other rooms where water is used. Serves to prevent sewer gases from entering the room.

Unlike a conventional siphon with a water lock, a dry drain can perform its functions during long interruptions in the use of water.

That is, even in the toilet, after a couple of months of non-use, the water evaporates, and air from the sewer begins to enter the apartment. Which of course is bad. We have the same with other siphons with a water seal.

What can be done with the toilet and siphons during a long absence - read here.

The dry ladder is designed so that the sewer gases in it are cut off not by a water lock, but by plastic or metal curtains.

There are also dry ladders with a float. In the absence of water, the float sits on the saddle and blocks the air supply. But this option is not very good -

if there is excess pressure in the sewer (and this sometimes happens), then the gas will be able to raise the float and enter the room.

The outlet of water at the ladders is vertical and horizontal. The most commonly used are horizontal. In this case, it is imperative to ensure a sufficient slope of the sewer pipe, starting from the ladder itself.

Let me remind you the requirements of SNiP for pipes f50 mm - pipe slope 3cm / 1m. When laying pipes, we try to avoid straight lines, and even more so sharp corners.

If the ladder is installed in the floor, then it is very important right make a floor slope to the ladder. How to do this is described here.

Stanislav Plitochkin was with you. I will help save SVDN ©!

2 comments

Good afternoon, Stanislav! Help me please! I have a steel ladder in my shower room. But the grate and something that should block the gases from the sewer are lost. I can’t decide which component to buy, what is the name of this component? Or do I need to change the whole thing by buying as a set? Could you advise me on whatsapp? My number is 89256260038. Sincerely, Lucia Mikhailovna, pensioner.

• Good day, Lucia Mikhailovna! The best advice I can give you is to take a picture of the ladder with your phone and show it to the salesperson at the construction market. Most likely you will be offered to buy the ladder as a whole, because I have never heard that they were sold in parts.
  If three or four sellers tell you so, then you have no other choice - you have to buy. But, there is a chance for a positive outcome of the case, so try it!

To prevent the ingress of unpleasant odors from the sewer into the premises, special structural elements are used. The simplest of them is a hydraulic or water seal. Nevertheless, as practice shows, such a system does not always and everywhere work effectively. Therefore, recently, a ladder equipped with a dry siphon has become more and more common. It has the same properties as a water seal, but it is devoid of its shortcomings. The design features of the dry drain allow it to filter sewage, separate large elements, thereby preventing clogging and accidents. However, the main function is to prevent fetid odors from entering the living quarters from the sewer system.

• 1 Views
• 2 How to choose
• 3 Mounting

Kinds

If you analyze the plumbing equipment market, you can find several types of dry drains:

1. Membrane valves. Experts consider them the simplest in terms of design, but no less reliable. The main element is a spring-loaded membrane, which opens slightly due to the action of the water flow and diverts wastewater. As soon as the flow of water stops, the membrane closes and guarantees tightness.
2. Pendulum gates. A similar drain, equipped with a dry siphon, has a valve with one fixation point. When the drain passes it, the valve deviates from the axis, after which it returns to its original position due to the influence of gravity.
3. Float gates. Some even manage to make them with their own hands. In fact, the float ladder is a combination of dry and hydraulic shutter design. It is a ladder with a vertical outlet and with a plastic valve built into it. If we are talking about our own production, then use balls of the right size.

Float valves work according to the following principle. If there is enough water in the water seal, the ball floats and does not delay the drainage. If there are long breaks in use, the water partially evaporates, and the ball falls into a special nest. Due to this, the shutter is sealed. After draining, the water re-enters the system, the design begins to work again as a water seal.

Dry drains have not yet gained their well-deserved popularity due to their higher cost compared to standard solutions. Their work is based on the working elements used, which, due to their design, always tend to return to their original position after being displaced by the flow of effluents.

How to choose

If you still decide to purchase a drain equipped with a dry siphon, it is important to pay attention to the conditions under which it will be installed.

1. To begin with, determine how much sewage will pass. It is enough for an ordinary apartment that the conditional passage of the ladder is 50 millimeters, and if it is a public bath or shower room, then 100 millimeters.
2. The height of the device. A ladder with a horizontal outlet can be mounted under fairly tight conditions, since its height is about 7-10 centimeters. The vertical type of shutter is more demanding in this regard, since it needs a minimum of 15 centimeters of free space for installation.
3. Before purchasing the device, make sure that all its elements are in good working order. Ideally, you can check the functionality of the product.
4. Only by providing for all the technical nuances, you can pay attention to external aspects. The ladder grate is made of plastic, metal, with a variety of shapes, and so on. The choice already depends directly on your wishes and requirements.

Mounting

If you have already encountered the installation of a hydraulic shutter, then a ladder equipped with a dry siphon will not cause problems during installation. All because there are no fundamental differences.

An important condition for a competent installation is the provision of high-quality waterproofing for the system. To achieve this, modern insulation materials are used. Under certain conditions and needs, they also carry out sound insulation, do not disregard the issue of insulation.

The installation of the device should be carried out in such a way that the grate of the ladder is on the same level with the floor finish. Due to this, you will not encounter discomfort during operation, you will not hit it while walking around the room.

As practice shows, the dry principle ladder guarantees trouble-free and reliable operation of the sewerage system. It becomes especially relevant when evaporation from the water seal occurs due to rare operation, or other factors that cause water to be drained.

Of course, without the appropriate experience and knowledge, it is not recommended to do the installation yourself. To save strength and your own nerves, it is better to contact specialists with the necessary qualifications. They will quickly carry out the installation, ensure a really reliable and efficient operation of the system. You can fully appreciate the advantages of this type of ladder.

The drain HL 310 NPr is used indoors to drain drains from the floor level. The drain is equipped with a 50 mm water trap ("dry" siphon Primus), which does not let sewer odors into the room when it dries out. Permissible load on the ladder - a maximum of 300 kg. Throughput - 0.5 l / s. Drainage temperature - no more than 85°C (a short-term runoff of water with a temperature of up to 100°C is possible, but for a drain volume - 100-200 liters). Outlet - vertical DN 50/75/110. Weight of the ladder HL 310 NPr - 0.7 kg.

The drain 310NPr has: an extension made of polypropylene with a 123x123 mm subframe, into which a 115x115 mm stainless steel grate is inserted, "dry siphon". The body is made of polyethylene with a "plate" for picking up waterproofing.

The price of the ladder HL 310 NPr is 2237 rubles.

Features of installation of the ladder HL 310NPr: The height of the extension element of the ladder is adjustable from 12 to 70 mm (it is cut to the height of the screed). You can not cut the body! Because this will reduce throughput. If it is necessary to increase the height of the ladder, HL extensions (340 N and 85 N) are used. If the drain is installed in a gap in the waterproofing, then the rubber sealing ring is not placed on the extension. The absence of a ring allows water that has fallen on the waterproofing to drain freely into the sewer through special channels in the extension and the body of the drain. If sheet material of the type - bituminous sheet, EPDM or PVC membrane, etc. is used as a waterproofing, then for a tight connection of the waterproofing with the drain body, it is necessary to use a stainless steel flange HL83.0 (for EPDM / PVC membranes) or HL83.H (for bituminous cloth). Flanges are not included in the scope of supply and must be ordered separately.

How the Primus siphon works

Siphon while draining Water seal drying out Siphon in "dry" condition

1. Siphon body

2. Float

3. Air in the body of the float

4. Water (water lock)

Components of the drain HL 310 NPr:

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