Gate valves pneumatic for bulk products. Gate valves

All valves are designed to stop or allow the flow of a fluid. Gate valves are one of the original valve designs that perform this function perfectly.
The difference is that an element in the form
metal wedge or plate. This design is capable of not only preventing, but also cutting inclusions in liquids that flow inside the valve. From here follow the areas of use of this equipment.

Scope of application of slide gates

Insensitivity to the presence of solid and fibrous inclusions in the working environment, makes it possible to use this gate valve in many areas of human activity.
Namely:

• mining industry

• oil refining industry

• gas industry
• sewerage
• pulp and paper production

• chemical and food industry

• ventilation systems
• construction. It is widely used in this area.

You will find it in almost all installations where material flow needs to be enclosed or controlled. Thanks to the ability to create special geometric shapes and a variety of blades, it meets all the requirements of the construction industry, including the food sector.
This is not the whole list of applications, you can list quite a lot. The scope of application can be distributed both on an industrial scale and in everyday life.

What are slide gates for?

• flow block,
• separating function,
• regulate the flow rate.

Types of sliding gates

Control method:

• manual
• electric
• pneumonic
• hydraulic

By type of design: oblique and straight.

According to the principle of action:

• unilateral

• reverse. Double direction gate valves are different from conventional types. They usually have two seats in a split housing.

Gate valves can be installed in any condition, from horizontal to vertical. This will not affect their reliability.
Also distinguish:

• gate valves without sealing. The design of such equipment is quite simple. The valve is usually in the form of a disc.
• sealed gate valves. Additional seal made of rubber, which makes the valve tight.

When installing sliding gate valves, the material from which they are made is of great importance. Usually this material is stainless, high carbon steel. The damper surfaces are painted with powder enamel.

Blade parts can be coated with abrasion-resistant plastic. This is typical for food and chemical industry. The gate itself is carefully polished to prevent the possibility of jamming. Now manufacturers are increasingly using non-traditional elastomers, and more innovative material. This material allows you to increase the service life by two or more times.

What is this device

As a rule, it consists of a body, elements with holes through which the given medium passes. The shutter itself must be in the form of a disk or special for this equipment. Torque is transmitted to this shutter (see). It can be transmitted manually or automatically, depending on the type of control. This causes the damper to move. Although manual mode is increasingly being replaced by automatic mode, it is indispensable in some cases. In the event of a power failure, the system can also operate productively. Therefore, the possibility of combined regimes is being considered today.

There are also connecting pipes, which are necessary for connection to a pipeline or other device. Often applied welding joint, but that's only with piping. And in sewer systems, special sockets are used or the connection is made using.

Benefits of slide gates

• simplicity in design, a small number of parts.
• ease of use.
• small overall dimensions.
• use for transporting a viscous working medium.
• ease of maintenance.
• long service life.
• a wide range, in connection with this a wide range of uses.

Sealed construction, silent operation, special rust cleaning system. Which is also of great importance.

Flaws

As with every system, there are drawbacks. Perfection, unfortunately, does not exist.
These include:

• great opening and closing times.
• repair difficulties, when sealing surfaces are worn during operation,
• high repair cost. This is caused, as a rule, by the replacement of a certain part or a completely given structure, hence an expensive repair. But long term service compensates for this shortcoming in full.
• impossibility of application at crystallizing inclinations in the given environment.

Conclusion

For many centuries, mankind has been using shutters. Of course, during this time they have changed and improved, but the principle of operation remains the same. They still represent a modern, simple and high-quality system that solves many problems, both in production and in everyday life.

When choosing modern sliding gates, you can now find a good ratio of quality and price. Considering that the slide gate operates under conditions of increased loads, its choice should be more carefully considered. It is better to purchase products from trusted manufacturers. And often the higher cost pays off with a longer service life.

Thus, after conducting a study of this market, we can conclude that each option has its own disadvantages and advantages. Knowing them, you can achieve excellent results. The main thing is to clearly set the task and approach the solution competently and individually. There are all possibilities for this today. Experts will help you find the right solution in this matter.

The name "gate valve" is used for parallel valves, the locking element of which is made in the form of a plate. They are also referred to as “knife gate”, although “GOST 24856-2014. Pipe fittings. Terms and definitions" does not recommend doing this.

Despite the fact that the gate valve is parallel, as they say, “by definition”, in the information space you can find the expression “wedge gate valve”.

The adjective "gate" is derived from the noun "gate". The word "shiber" has German "pedigree", it comes from the verb schieben ─ to push, move, thrust, etc.

If we talk about the general technical universal meaning of the term "gate" in Russian, then this is a moving plate that serves to block the flow of something. For example, a gate valve for a chimney ─ a damper in the chimneys of furnaces. A gate is a metal sheet that moves perpendicular to the axis of the duct and serves to regulate the air flow by reducing the through hole until it is completely blocked. Gates are in boiler installations and water intake facilities. A gate is a device for periodically closing the lower part of the shaft installed in the collection chamber, which serves to load solid household waste into containers.

In pipe fittings, a gate, along with a spool, a disk, a wedge, a plunger, etc., is called the movable part of the gate, which has the form of a plate. Due to its movement, it changes throughput reinforcement and the opening-closing of the passage section occurs.

AT English language a gate valve whose gate contains a gate is called a slidegatevalve or slabgatevalve. The gate itself is called differently ─ slab (eng. ─ plate, panel, piece); knife (eng. ─ knife); slidinggate (eng. ─ sliding gate); slidingplate (eng. ─ sliding plate).

The principle of operation and design of gate valves

Moving, as it should be for gate valves, perpendicular to the flow of the working medium, the gate opens and closes the through hole. The force that the slide valve drive creates is transmitted to it through the spindle (rod).

The design of a gate valve includes the following main components and parts: body, knife (gate), post, sealing element, stuffing box seal.

The tightness of the gate valve in the closed state is ensured by pressing the knife (gate) against the seal under the pressure of the working medium. Gate valves are manufactured with one-way and two-way tightness.

In their design, both retractable and non-retractable stem are used. The second option is especially popular when there is a shortage of space.

Frame

The body of a sliding gate valve, having a rectangular or cylindrical shape, is made in one piece, monolithic or prefabricated, welded, for example. A design feature of a gate valve can be a removable bottom cover and a through knife (gate).

For the manufacture of gate valve bodies, gray or ductile iron with nodular graphite and various steels are used - carbon, low alloy, stainless.

The material of a sliding gate valve cannot but affect its resistance to aggressive media. The cast-iron gate valve is somewhat worse than the steel gate valve resists the effects of gasoline, diesel fuel, industrial and motor oils. A combined version is possible - the body is cast iron, and the parts in contact with an aggressive environment are made of stainless steel. An epoxy coating can provide corrosion protection for the housing.

For housings, not only ferrous metals are used, but also non-ferrous (aluminum alloys) and even non-metallic materials. In the assortment of some manufacturers, a sliding gate valve made of PVC (polyvinyl chloride) is presented.

Shiber (knife)

Gate valve can be in the form of a plate made of thick rolled products with parallel sealing surfaces. A hole is drilled in the slab, the diameter of which is equal to the diameter of the pipes located opposite, ─ this is the so-called. gate with a through hole. When the hole is exactly opposite the nozzles, the gate valve is fully open, and when it “leaves”, the valve closes.

The gate may have a sharp edge, making it look like a guillotine or a knife. A consequence of the similarity of the gate with a knife is the name ─ “knife gate valve”, and with the guillotine ─ “guillotine-type valve”.

The presence of a bevelled polished edge allows the gate, like a knife through butter, to penetrate into the working environment, providing a quick shutoff of the flow of even the most viscous materials containing a huge amount of mechanical impurities.

For knives (gates) and spindles (rods), as a rule, stainless steel is used.

The knife is polished, the smooth surface provides free sliding at the points of contact with sealing materials and avoids all kinds of braking and jamming, which is especially important when the working environment contains a lot of mechanical impurities.

Seals

Gate valves can be made with metal-to-metal (metal/metal) seals or with tighter soft seals made of synthetic materials.

Nitrile rubber resists petrochemicals well.

Performance in contact with oils and fuels, including in areas with a cold climate, is distinguished by rubber compounds based on SKN.

High tightness even when exposed to aggressive liquids and high temperatures demonstrates Viton.

Silicone seals are used in gate valves used in the food and pharmaceutical industries.

Thanks to the stuffing box, the tightness of the upper part of the slide valve is ensured. For its stuffing, cotton fiber (oiled and dry), synthetic fibers, graphite-containing materials, etc. are used.

Gate valve control methods

Gate valves can be equipped various types control: manual or hydraulic, pneumatic, electric drive.

With relatively small nominal diameters, a manual drive is often used - a manual gate valve. It can be a flywheel (handwheel) with a retractable or non-retractable stem, a lever or a square nozzle for a T-shaped key. A flywheel with a chain is used when the valve is located in a hard-to-reach place. The lever is used for small nominal diameters (DN up to 200-300). Reducer ─ with sufficiently large values ​​of DN and PN.

If you need to control gate valves large sizes, resort to the help of a mechanized (automatic) drive.

They use a pneumatic drive of one-sided or double-acting, including with a manual override. The extreme positions of the knife are set using the adjusting bolts.

Electric gate valves for fixing the extreme positions of the knife are equipped with limit switches.

Connection to the pipeline

For gate valves, the following types of connection are used: flanged (flange gate valve), wafer (wafer gate valve), welded.

With interflange connection, the gate valve is installed between flanges welded to the pipeline. To fix the valve, bolts or studs are used. The tightness of the connection is ensured by means of interflange gaskets.

Benefits of gate valves

Sliding gate valves, which make up a significant part of the assortment of many manufacturers of pipeline valves, have a number of advantages, the most significant of which are given below in the form of short theses.

• Knife gate valves are characterized by a short construction length, for example, compared to cranes.
• The device of a sliding gate valve is relatively simple, which, on the one hand, predetermines the ease of its installation (say, the possibility of replacement without cutting into the pipeline) and ease of operation, and, on the other hand, reliability.
• Reliability indicators largely depend on the parameters of the working environment ─ its aggressiveness, temperature, concentration of mechanical impurities.
• Gate valves are unpretentious and not capricious equipment, their maintenance and repair will not require very highly qualified personnel.
• Knife gate valves from the best manufacturers using high-quality components and modern materials, have such important properties as durability, resistance to wear and aggressive environments.
• The service life of gate valves can be measured in three or more decades, determined by the service life of the body. For other components, it is smaller, but also very impressive. For example, for rubber products - at least 5 years. The same is the average service life between major overhauls of a sliding gate valve.
• The absence of stagnant zones and the ability to self-clean allow you not to think about slag and dirt.
• An important parameter is the minimum hydraulic resistance of the medium. For example, for gate valves manufactured by ARMATEK, the coefficient of hydraulic resistance is no more than 0.3 with a fully open knife.
• Gate valves have unique technical capabilities, including high speed and high tightness. Including the tightness of the high class And according to "GOST R 54808-2011. Pipe fittings. Valve tightness standards.

Technical parameters and a wide range of functionality ─ a range of sizes, pressures and temperatures that exhausts all needs ─ make gate valves truly universal pipeline valves in demand in various fields of technology.

Application of gate valves

The design features of gate valves make their presence particularly appropriate in pipeline systems that provide the movement of complex working environments. For example, media characterized by a high content of mechanical inclusions, having a high viscosity, pulp-like (pulp is formed by mixing solid particles and liquid) and even loose.

Scroll technological processes, for which the ability to handle materials that are absolutely unacceptable for many other types of pipeline valves is of fundamental importance is very wide.

• mining industry

The most important segment of the mining industry is mineral processing. As the reserves of ore and non-metallic raw materials are depleted and the share of useful components in its composition decreases, the value of enrichment only increases. Gate valves are widely used in process plants enrichment plants to ensure the efficiency of the processes of transportation, washing, chemical treatment, dosing of raw materials, classification and preparation of pulps, filtrate removal and many other operations.

• Oil and gas industry

Along with the mining industry, Stanovoy Ridge Russian economy constitutes the oil and gas industry.

Gate valves are part of the X-mas tree used in the production of hydrocarbons. Gate valves are also installed on main oil pipelines, where they serve as a guarantor of the immediate shutdown of the flow of crude oil. There is even a special regulatory document ─ “GOST 55020-2012. Pipe fittings. Gate valves for main oil pipelines. General technical conditions".

• Chemical industry

Gate valves are mounted on production and technological lines that provide the release a wide range chemical products - ammonia, aromatic hydrocarbons, liquid glass, mastics, mineral fertilizers, paraffins, solvents, acids, etc.

• Production of building materials

Gate valves complete installations for sand washing, production of bulk and granular materials ─ gypsum, dolomite, lime, chalk.

Gate valves are widely used in cement production equipment.

• Electricity and utilities

Gate valves are used in the electric power industry, including such a critical segment of this industry as nuclear power. In particular, gate valves manufactured by ARMATEK were delivered to the Rostov NPP.

Gate valves are installed by city water utilities on water supply and sewer networks. They are extremely effective when completing equipment that ensures the transportation of industrial and municipal wastewater to processing sites.

Gate valves are successfully used in a number of industries not listed above ─ food, pulp and paper, woodworking, metallurgical, textile. And also in agriculture, at treatment facilities and in many other areas of technology.

Designation of gate valves

"GOST 24856-2014. Pipe fittings. Terms and Definitions" does not recommend using phrases with the adjective "conditional" instead of the term "nominal diameter", such as ─ diameter of the conditional passage, conditional passage, conditional diameter. Nevertheless, even today everyone perfectly understands what the combination of the letters “Du” means in the words gate valve Du100 (and further Du150, Du200, Du400, Du500 ...). Sometimes "Du" or in accordance with the current normative documents─ DN, lowered, saying: gate valve (gate valve) 200 250, 300, 400, 1000.

Appendix B (recommended) "Recommendations for the formation of the name of the reinforcement in the documentation" to the aforementioned GOST recommends that the name of the reinforcement be formed according to the following scheme: "type of reinforcement ↔ type of reinforcement ↔ design variety ↔ DN ↔ PN".

Many manufacturers of pipeline fittings use their own principle of naming, trying to make it as informative as possible. For example, ARMATEK uses the following algorithm for sliding gate valves:

"type of product ↔ connection to the pipeline ↔ type of actuator ↔ nominal pressure of the working medium ↔ nominal flow ↔ climatic version ↔ seal design ↔ body material ↔ material and design of the spindle ↔ knife material ↔ seal material".

Whatever you call a gate valve, one thing is obvious ─this constructive version of the valves has large, without exaggeration, unique opportunities, successfully showing them in a variety of industries.

The scope of use of slide gates is very large. They are used in sewerage systems, as well as in treatment facilities in almost all areas of industry. As a rule, knife gate valves are used as shut-off and control valves for pipeline systems through which hazardous media are transported. It is distinguished by a fairly simple design and optimal building length, which are ideally combined with each other. The design provides for the presence of a special wedge or knife, which guarantees a reliable and effective blocking of the flow of the working medium.

Motorized sliding gate valve is recommended to be installed on pipelines with large diameters, which are characterized by moderate indicators of hydraulic resistance. In the case of transporting aggressive substances through pipes, such a device is indispensable.

We can distinguish the following types of sliding gate valves:

— type ShN.

The first type does not have a sealing element, and the locking piece is made in a symmetrical shape. The second type has a seal, which in most cases is made of rubber. The locking part has the shape of P, which in turn allows you to achieve solid performance in terms of strength.

The manual sliding gate valve has a simple design and a disc-shaped valve. This is a reliable and functional device with clear and simple controls. They are further subdivided into two or one-sided, as well as wafer and bunker. Maximum convenience during operation is achieved due to the presence of a steering wheel, lever and electric drive. Manual control is characterized by several options:

• control by means of a handwheel having an immovable stem;
• control is carried out thanks to a chain, lever or cardan transmission.

In the manufacture of slide gates for bulk materials, the following are used:

• ductile iron;
• carbon steel;
• heat-resistant alloys;
• alloy steel;
• titanium.

The bodies of such valves have high strength, which allows them to be used for a long period of time. They work absolutely silently, differ in good tightness and simple installation. They are also equipped with an effective cleaning system that prevents the accumulation of various dirt.

Buy knife gate valves for bulk materials

Turning to our specialized company, you can quickly and profitably buy a slide gate in any quantity. In case of any questions, our specialists will give comprehensive answers and tell you about the main features of a particular product. Gate valves for various industries have the necessary permits from Rostekhnadzor of the Russian Federation, as well as quality certificates. When choosing the material of manufacture, the characteristics of the working environment are taken into account, temperature regime, as well as pressure. The customer can choose the version of the product.

Prices for sliding gate valves with electric drive or manual

The sliding gate valve at a price that will be pleasant for all our customers is an indispensable element for the normal functioning of pipelines. Our site presents a huge range of pipe fittings, which is highly reliable and easy to use. A convenient presentation of slide gate models on the site will allow you to study in detail their main characteristics and buy the device you like.

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• type Sh. Has no seal. Differs in a symmetrical locking element, it is located arbitrarily in relation to the direction of the flow of the working medium.
• shn type. Has a rubber seal. Equipped with a P-shaped sealing rubber element, which allows for increased tightness compared to the first type. The working position of the gate of this type determines the direction of the flow of the working medium - the seal of the shield is pressed against the body of the gate by the flow.

The device and principle of operation of the slide gate

Device diagram slide gate round section: 1-body, 2-knife, 3-herring, 4-sealing rubber, 5-cover, 6-rod, 7-nut, 8-yoke, 9-sleeve, 10-ring-clamp, 11-wheel, 12-cap, 13-protection, 14-gasket.

An electric sliding gate valve is a body with two seats located inside - fixed elements with holes that are intended for the passage of the medium into them. Inside the body between the saddles there is a shutter, which is made in the form of a disk. With the help of a threaded pair of nut-spindle, torque is transmitted to it. This device can be either electrically driven or controlled by means of a gearbox, manual or pneumatic drive. The spindle, driven by a drive or a handle, rotates and makes the disk move. The disk rises when torque is transmitted from the spindle, thereby opening a passage for the working environment. Or he starts down, which leads to the blocking of the passage.

Two connecting pipes extend from the body of the device, thanks to which it can be connected to the pipeline. The method of connection is usually flanged, rarely - coupling with small nominal diameters of the passage. The locking element, sharpened along the entire edge, is called a knife gate valve. Such sharpness makes it possible to use the device to shut off the flow of abrasive and granular media. The knife gate is made of high strength steel. During operation, it is polished in order to prevent jamming.