Steel valves. Steel valves Quality valves at a favorable price

The main properties possessed by products that are elements of water supply and heating systems, in particular shut-off valves, are determined by the metal used in the production. Important properties that the valve material must have is:

Durability, because the water flow in the pipes creates high pressure... Moreover, when emergency situations it can increase many times over, giving rise to the need to have a large margin of safety for a single product;
Minimal exposure to metal corrosion. Oxidation reduces the operational properties of metals, which means that products affected by it to a greater extent must be promptly replaced with new ones in order to avoid breakdowns;
Low cost individual product, as a leading factor in the economic success of work for both an individual and a large enterprise.

Incarnation harmonious combination average indicators for all these qualities, has a steel shut-off valve of all design variations. The sales of this product occupy a significant niche, and it will help to figure out why this is so. detailed analysis its properties.

Properties of steel in the production of steel direct-flow valves

The best and most practical man-made iron-based material is steel. In addition to the base metal, it also contains a small percentage of carbon. To be called steel, its content in a metal alloy cannot exceed 2.14% of total mass... With such a low amount, carbon mass does not have a critical effect on reducing the viscosity and elasticity of the iron structure, but gives many positive changes. Among the main distinctive properties became available:

High resistance to mechanical damage. This is achieved because the steel valve has greater elasticity and strength than cast iron, much higher than the performance of brass products;
Possibility of interaction with hot liquids and gases. The temperatures of the working environment can reach 425 0 С without any consequences for the unit's performance;
The relative resistance to corrosion prolongs the life of units made of steel, which means that they will not need to be replaced as often as, for example, for cast iron products.

Thus, steels have the best quality-to-price ratio of all materials used in the manufacture of valves. This is the middle peasant of the market, which will find a place in a large node. industrial system water and gas supply, as well as will be the solution to many small domestic problems at the level of organizing systems in an apartment or private house.

Design and principle of operation steel valve

The design of the shut-off valve, also referred to as a valve with a capacious word, has a long history and wide application possibilities. As such, this device is designed to regulate the flow rate of the working medium in the pipes, up to its complete shutdown. The effectiveness of such valves, along with the extreme simplicity of the design, determines their popularity.

There are few components of a steel flanged valve:

Through the body of the product, made of steel, the working medium (liquid or gas) is passed through, in a certain place of which there is a bottleneck. It is this that serves to block the flow, with the assistance of other elements of the system;
The working body of a steel direct-flow valve is a spindle that receives torque from a handwheel, controlled manually or mechanically (in systems with automation);
Nut - a threaded hole through which the spindle moves in the course of performing its functions. Structurally, it is part of the valve body;
The spool is located at the lower end of the spindle. It is made of elastic material, it is he who blocks the duct;

The operating principle of the entire system is quite simple. The spindle, when screwed in, lowers the spool located at its lower end. During this action, the spool. The latter, in the extreme lower position, sits in the "bottleneck" of the body, completely blocking the passage, making it impossible for the further movement of the working medium inside the valve.

This principle is the same, but it has its own characteristics in various designs steel valve:

The usual and most common angle between the direction of the spindle and the flow of the medium in the valve body is the standard 90 ° C. Such a valve is called a straight-through valve. However, with such an arrangement, the hydraulic losses in the flow rate increase, because the design of the damper assumes a difficult path in the form of two turns, which overcomes a liquid or gas in it. This forces to increase the pressure in the system, to compensate for all losses, but increases the load on the weak bridles, in particular the valve.

Somewhat smaller, but significant internal resistance have angle valves. Their spindle is located directly on the bend, which significantly reduces the possibility of its use to special places in the pipeline system. In them, the workflow makes a 90 ° turn only once, after which it continues unhindered;

To reduce resistance, an inclined arrangement of the spindle and, accordingly, the shutter inside the body are used. Such a unit is called a steel direct-flow valve, which indicates an almost unhindered flow of liquid inside the valve. Accordingly, the reaction coefficient in them is much lower, but at the same time they perfectly perform their functions of regulating the flow intensity, albeit with a slightly increased spindle stroke length.

It is also worth noting that when not large diameters, sufficient force to be transmitted to the spindle is also quite small. But with an increase in the throughflow and pipe sizes, it becomes necessary to significantly strengthen the entire structure and, above all, the rotary system in order to ensure smooth rotation and tightness of the spool fit into the body seat.

Types of fasteners

The reliability of the system depends not only on the material that underlies the product and its design features, but also from the system of its fastening on the pipe section. The development of systems has influenced the diversity of this factor, offering under Various types tasks, their own, economically justified this way:

The welded method assumes hermetic fastening of the steel valve by means of welding works... With high quality installation work a single joint of the highest strength class is formed, but it is not easy to achieve. Therefore, this method is entered only in the absence of other possibilities to connect, together, two elements of the system;
Method of connection by means of a coupler or union, i.e. threaded contact, used for small pipeline diameters, up to 40 mm. Threading can be carried out both with inside valve and on the surface. To connect to the pipe, there are a lot of different fittings and adapters designed to improve the quality of fixation. An important role in this is played by the sealing of the thread with seals made of flax strands or polymer tape impregnated with sealant. This type fasteners cannot provide reliability at large diameters, creating the danger of thread breakage under overpressure... This forces us to look for other means of fastening;
In such cases, it is justified to use a steel flanged shut-off valve, which at the inlet and outlet has a special plate with a hole for the pipe diameter, round or square shape(flange). Similar pads are attached to a section of the pipeline. They have specially prepared holes for bolted connection parts through a sealed gasket. The flanges are fixed to the pipe and valve either by welding, or, in the case of a cast production method, they are pre-positioned on the mold and are initially present on the product. This type of fastening is considered the most reliable for systems with high internal pressure. Strength depends on the number of bolts and the strength of each of them separately.

Advantageous offers of steel flanged valves

Acquisition quality products at a price commensurate for her - the goal of each purchaser. Do right choice, before buying a steel flanged valve or another type, you can only competently consider the various proposals from manufacturers and compare the characteristics that they guarantee for their products.

You can carry out such an analysis using the list of products on the TechArmatura website. The full set of characteristics of each product, displayed on the respective product pages, fully reflects their qualities. You can find out first-hand the cost of the goods, as well as order a batch a certain amount and even pay for it using a remote service.

Didn't find a copy suitable for your characteristics or you really need a unique sample of the product - we will help here too. The list of services provided by the company includes the possibility of manufacturing by our own own production, steel shut-off valves to order according to the drawings provided. Quality assurance coupled with perfect compatibility with the project will make our cooperation in the purchase of valves very promising and long-term.

When completing pipelines in public utilities and industry, today they are used different kinds shut-off valves, for the manufacture of which different materials are used.

Steel valves are widely used, which demonstrate a long service life and high reliability in operation. difficult conditions exploitation. You can buy steel shut-off valves from leading manufacturers in the Santekhkomplekt company in Moscow.

Features of steel valves

Steel valves, or valves, are one of the most common types of shut-off devices that are used in pipelines:

in utilities;
in energy;
in industry.

Coupling and flanged valves are distinguished depending on the method of connecting the pipeline. In the first case, applies threaded connection, and the valves themselves are used for installation on pipelines relatively not large diameter.

Flanged valves are installed on large-diameter pipelines with significant pressure of the pumped medium. They are connected to the pipeline using a bolted flange.

The valve structure consists of a steel body with a cover, a spindle made of steel and brass, a spool-type locking element. The characteristics of the steel used for the manufacture of valves allow them to withstand significant operating pressures and significant temperature differences, which expands the scope of the shut-off devices.

Steel valves in the assortment in the Santekhkomplekt online store To increase the service life and the possibility of operating the valve in an aggressive environment, a galvanized anticorrosive coating of steel elements can be used.

The key characteristic of a steel valve is the reliable shut-off of the flow of liquid pumped through the pipeline. Therefore, high demands are placed on the quality of the spool, which should provide maximum snug fit fluoroplastic gasket to the sealed surface.

The gasket must also meet high quality and reliability requirements, retaining its properties after multiple valve opening-closing cycles. The spindle is sealed with a gland seal to be executed from quality materials, excluding the possibility of leakage.

When completing pipelines, it is necessary to use high quality steel shut-off valves, which have a service life of at least 1500 opening-closing cycles. In this case, long-term operation of the device and reliable blocking of the liquid flow without the formation of leaks will be ensured.

Quality valves at a favorable price

You can buy high-quality steel valves in Moscow on the most favorable terms in the Santekhkomplekt company.

We offer shut-off valves only from leading manufacturers who fully comply with the requirements of current standards and use high-quality materials. This ensures long-term operation of devices with reliable locking, even when difficult conditions operation under the influence of aggressive media and temperature extremes.

Our catalog contains valves with both flanged and socket type connections. A wide variety of valve sizes are available. This allows us to meet the needs of any customer. Our company offers the most favorable prices and ensures prompt delivery of steel shut-off valves in lots of any size.

We offer you to purchase steel valves from Aglant company on favorable terms, with delivery straight from a warehouse in Moscow, our specialists constantly monitor current news and the most popular products and products of the industrial, construction and engineering markets and are ready to assist you in choosing the required model, brand and type of steel and any other pipeline and stop valves!

Features and General characteristics steel valves.

This type of fittings is intended for shutting off or regulating liquid working media of pipelines on technological lines with water, steam, as well as with ammonia, carbon dioxide, natural and liquefied gases and corrosive substances. The reliability and quality of the use of steel reinforcement is guaranteed. Basically, such valves, their bodies are made from of stainless steel, grade 20 or 25, or alloy steel. Also solutions made of carbon steel are possible. Longer service life for alloy steel products. Compared to cast iron, fittings, the body of which is made of steel, has less weight, does not require additional elements at

The difference between steel and other materials

Steel shut-off and control valves are noticeably different from valves made of bronze, brass or cast iron. They are produced with a nominal diameter DN exceeding the average - up to 100 mm. and therefore they are used on larger highways than on ordinary residential buildings, and also withstand a higher value of the maximum temperature, up to + 425 ° C, and the pressure of the working environment up to 6.3 MPa. By the type of connection, such valves are mainly produced flanged, however, there are models with a socket (internal thread), or a pin (external) connection for welding. Installation of steel valves on the pipeline is allowed in any position. In the case of variants with counter flanges, it is necessary to precisely weld the inlet and outlet pipes on the pipeline, thus achieving the greatest tightness of the structure and simplifying the installation process, but dismantling with subsequent repair is somewhat more difficult, as a result of which the cost of the valve itself increases.

One example of a classic steel valve with flange connection and the manual drive is the 15S22NZh model manufactured by the Arzil company, made for operation at elevated temperature conditions and the pressure of the medium, however, the installation of such valves in networks with high static pressure is not recommended due to the danger of water hammer.

How to buy steel valves from us?

Our experts are always ready to help you and advise you in the selection of the necessary pipeline fittings, you just need to leave a request on the website or contact us by phone indicated on the Aglant website, in addition to free delivery in Moscow and the Moscow region, we deliver and dispatch goods to the terminals transport companies in any regions and cities Russian Federation, for example such as: Yekaterinburg, Samara, Krasnodar, Vladivostok, Chelyabinsk, Omsk, Penza, Rostov-on-Don, Perm, the Republic of Crimea and others.