What is a “dry ladder”? What are its advantages? A dry seal is the best protection against the penetration of unpleasant odors from the sewer. How is the seal at the drain constructed?

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

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

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

Installation features of the HL 310NPr drain: The height of the extension element of the drain is adjustable from 12 to 70 mm (it is cut to the height of the screed). You cannot cut the body! Because this will result in reduced 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 element. The absence of a ring allows water that gets on the waterproofing to flow freely into the sewer through special channels in the extension element and the drain body. If used as waterproofing sheet material type - bitumen sheet, EPDM or PVC membrane, etc., then for a hermetically sealed connection of the waterproofing with the drain body, you must use a stainless steel flange HL83.0 (for EPDM/PVC membrane) or HL83.H (for bitumen sheet). Flanges are not included in the delivery set and must be ordered separately.

How does the Primus siphon work?

Siphon while draining water The water seal is drying out Siphon in a “dry” state

1. Siphon body

2. Float

3. Air in the float body

4. Water (water seal)

Components of the HL 310 NPr drain:

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Dry shutter – best protection from penetration unpleasant odors from the sewer

One of the most popular devices in drainage systems is the sewer drain ladder. They are intended for receiving and discharging wastewater from a horizontal floor surface into the sewer system. These devices have found wide application in residential, public and industrial buildings. The design of the ladder must provide the following functions:

• drain water quickly and efficiently;
• filter wastewater from large contaminants;
• prevent the penetration of unpleasant odors into the room.

Advantages and scope of dry drain

Until recently, only ladders with a hydraulic seal were produced. A water seal is a specially filled water seal that prevents unpleasant odors from the sewage system from entering the room. Such a seal requires periodic updating in the form of a spill of water. The most common problem when operating sewer drains with a hydraulic seal is the drying out of water and the unpleasant odors that the sewer system is rich in easily penetrate into the room, causing inconvenience to people.

Assembly diagram for ladders with straight and oblique outlets

Let's figure out what can cause the water seal to dry out. There are many reasons, and the most important among them are: the ladder is used sporadically (for example, it is located in guest bathroom, in the shower room of a hotel complex or intended for drainage of water in the event of an emergency leak, and not for regular everyday use), heated floors, increased indoor air temperature, hot climate, failure of the water seal due to design errors in the sewerage system.

Currently, requirements are becoming more stringent; people need comfortable use of devices, eliminating additional labor costs for servicing devices.

The way out of this situation is to use a ladder equipped with a dry seal, and this solution is becoming increasingly popular.

This device does not allow the appearance of an unpleasant odor in the absence of a water seal and does not require frequent maintenance. A dry seal for sewerage can work either independently or in conjunction with a water seal, when each of them complements each other.

Dry shutter device

The most common devices:

1. Membrane. Under the pressure of water passing through the drain, the valve opens, and after the water passes, the spring moves the membrane to its original position. Access to unpleasant odors is reliably blocked.
2. Float It works due to the fact that the float is always on the surface of the water seal, and when the water evaporates, the float ends up at the very bottom and closes the passage.
3. Pendulum. Under the influence of gravity mechanical device constantly strives to take a position blocking the sewer pipe.
4. Based on the molecular memory properties of the material. Tubes made of elastic material are used, which always tends to return to its original shape.

Dry and combined drains are made from durable materials (mainly plastic housing and stainless steel grate) using modern equipment. The lineup these devices expand, you can choose a dry ladder equipped check valve to protect against the entry of wastewater from sewer system in case of flooding, and also select models that can be used in unheated rooms under conditions subzero temperatures, as well as heavy-duty, able to remain sealed under significant impact loads.

Main technical parameters

When choosing any sewer drain, including those with a dry seal, you must pay attention to a number of the following important technical points: the direction of the outlet and its diameter, throughput and its height. The outlet of the ladders is either located horizontally (straight and oblique outlets are made) or vertically (pointed down). The next parameter that needs to be taken into account is the diameter of the outlet. There are ladders with 50 and 100 mm. IN housing construction drains with a nominal bore of 50 mm are mainly used; they must ensure the removal of wastewater in an amount of at least 0.7 l/s. Drains with a nominal opening of 100 mm are installed in public premises and industrial facilities; they must ensure the removal of wastewater of more than 2.1 l/s. When selecting a sewer drain, great attention should be paid to such a parameter as the height of the drain (in modern models height ranges from 7 to 18 cm). Ladder made from quality materials, has an almost unlimited service life.

Installation of a sewer drain

Installing a dry device is no different from installing a drain with a water seal. It must be remembered that from quality installation, correct connection to the sewer system and from proper selection drain ladder depends on its service life, safety of water leakage and aesthetic appearance after finishing. Installation of a drain entails some lifting of the floor in the shower room or other room in which it is necessary to drain waste water from a horizontal floor surface. It is extremely important to create a slope of the floor to direct water towards the drain.

The floor in the room in which the sewer drain is installed must be a system consisting of several layers:

• material that provides thermal and sound insulation (for example, polystyrene foam);
• concrete screed;
• membrane material with waterproofing properties;
• a concrete screed that sets the required slope towards the ladder;
• ceramic floor tiles with a rough surface and a minimum percentage of water absorption, which is laid on a special adhesive solution.

When implementing installation work When connecting to the sewer, you must remember that the drain grate is installed flush with the floor surface and should not protrude above the tiles located in the immediate vicinity. The tiles are laid starting from the ladder. The thickness of the joints between the tiles should not exceed 2 mm; when sealing the joints, water-resistant grout is used. After completion of the work, the ladder is securely concreted into the floor.

Opt for a dry sewer drain and you will be able to forget about the musty smell from the sewer, and you will not need to regularly replenish the water seal with water. This device will serve you long years, perform their functions reliably and delight with ease of maintenance.

To prevent unpleasant odors from the sewer from entering the premises, special structural elements. The simplest of them is a hydraulic or water seal. However, as practice shows, such a system does not always and not work effectively everywhere. Because in Lately Increasingly common drains are equipped with a dry siphon. It has the same properties as a water seal, but does not have its disadvantages. Design features dry drain allows it to filter sewage, separate large elements, thereby preventing blockages and accidents. Nevertheless, main function is to prevent foul odors from entering living spaces from the sewer system.

• 1 Types
• 2 How to choose
• 3 Installation

Kinds

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

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

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

Dry drains have not yet gained the popularity they deserve 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 under the influence of waste flow.

How to choose

If you 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. First, determine how much sewer will flow through. Ordinary apartment it is enough that the nominal passage of the drain is 50 millimeters, and if it is a public bath or shower, then 100 millimeters.
2. Height of the device structure. A ladder with a horizontal outlet can be installed in fairly cramped conditions, since its height is about 7-10 centimeters. The vertical type of shutter is more demanding in this regard, since it requires at least 15 centimeters of free space for installation.
3. Before purchasing a device, make sure that all its elements are in good working order. Ideally, you can test the functionality of the product.
4. Only having provided for all the technical nuances can you pay attention to external aspects. The ladder grating is made of plastic, metal, with various shapes, and so on. The choice depends directly on your wishes and requirements.

Installation

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

Important condition proper installation is to provide high-quality waterproofing for the system. To achieve this, use modern materials isolation. Under certain conditions and needs, sound insulation is also carried out, and the issue of insulation is not ignored.

The device should be installed in such a way that the ladder grating is flush with finishing floor. Due to this, you will not encounter discomfort during operation, and you will not hit it while walking around the room.

As practice shows, a dry principle ladder guarantees trouble-free and reliable operation sewerage systems. It becomes especially relevant when evaporation from the water seal occurs due to infrequent use or other factors causing water drainage.

Of course, it is not recommended to do the installation yourself without the appropriate experience and knowledge. To save energy and your own nerves, it is better to turn to specialists with the necessary qualifications. They will quickly carry out installation, provide truly reliable and effective work systems. You will be able to fully appreciate the advantages of this type of ladder.