LD- trademark, under which the ChelyabinskSpetsGrazhdanStroy plant supplies pipe fittings to the market. Ball Valves LD in their price category has almost completely replaced foreign counterparts, they are distinguished by high reliability, durability and.

This article presents LD pipe fittings. We'll consider design features cranes, their functional purpose and working principle. The assortment of the company will also be studied and recommendations on the choice of specific models of fittings will be offered.

Article content

Design features of LD cranes

LD company produces industrial use certified according to the standard GOST No. 54808 “Pipeline shut-off valves“. All products are made in an all-welded housing that does not have bolted connectors, which reduces the risk of leaks under increased dynamic load in the pipeline to zero.

A feature of LD cranes is that for the manufacture of their body, not cast blanks are used, as in most competitors, but elements produced by cold stamping. This design provides increased strength of the body due to the absence of limiting stresses in the metal. Workpieces are joined in shielding gases (Ar+CO2) by means of automatic welding. The use of a gaseous medium provides a minimum waste of the alloying components of the steel, which gives an increased quality of the weld.

LD ball valves have the following layout:

1. The body is made of carbon steel grade 09G2S.
2. Connecting pipe for welding fittings to the pipeline
3. The neck fixing the rod on the body.
4. The stem that connects the hand lever to the locking element.
5. Restrictive washer that prevents stem shifts.
6. Locking ball with through perforation.
7. Seat seal made of M4K20 rubber;
8. Support ring.
9. Disc spring.
10. Stem Throat Seals - Ensures body seal against the environment.
11. The sealing ring performs a similar function.
12. Flanged connection plate.
13. The handle may have a "butterfly" configuration.
14. Round sealing ring.
15. Restriction nut - fixes the actuator handle on the stem.

All LD ball valves are certified according to the “A” tightness class - they have a zero level of leakage, which is achieved through the use of a system of redundant seals. Secondary seals are represented by O-rings located on the PTFE seat of the shut-off ball.

Valves with a diameter of 50-500 mm have additional disc springs on the saddle, which ensure the same tightness of the valve during circulation working environment in both directions regardless of its temperature.

LD valves have a unified type marking KSh.Ts.F.015.0.040.X/L.03, wherein:

• KSh - ball valve;
• C - all-welded;
• F - flanged (M - coupling, P - for welding);
• 015 – nominal diameter, mm;
• 040 - working pressure, Bar;
• X/L - cold-resistant design with respect to impacts environment;
• 03 - time between failures, thousand cycles (at least 3000).

All modifications of LD fittings can be mounted on the pipeline in any position - vertical or horizontal.

Production of LD ball valves (video)

Product range

The range of LD pipeline fittings is divided into three series:

• Energy KShTsF - flange type ball valves;
• Energy KShTsP - ball fittings for welding;
• Energy KShTsM - coupling type valves for threaded connection.

Each series includes designs with a nominal diameter of 15-500 mm, designed for operation in systems with pressures up to 40 MPa. The company produces in a carbon steel casing, which can be installed on water supply pipelines, heating mains, lines for transporting fuels and lubricants, liquids, gases and vapors that do not contain abrasive impurities.

The range also includes fittings made of stainless steel, suitable for operation in any systems, the working environment of which does not have a corrosive effect on body materials. The temperature range of the transported medium is from -60 to +200 degrees, the environment - from +60 to +60 0.

The lineup pipe fittings LD consists of the following items:

1. Full bore and reduced valves with a diameter of 15-500 mm. In full-bore structures, the cross section of the through hole is identical to the diameter of the pipeline on which the fittings are mounted; in reduced analogues, the hole size is 80% of the pipe diameter. Designs with a diameter of 15-200 mm are made with a manual drive-handle. Standard size 150-200 mm is equipped with a worm gearbox, which facilitates valve control, with products 250-400 mm a mechanical gearbox is supplied.

   

2. Drain cocks for gas and liquid working medium - are available in a diameter of 15-50 mm. They are made in cases made of carbon steel 20X13 and stainless steel AISI304. Designed for installation on technical tanks, reservoirs and thermal equipment in order to release the working environment while monitoring its presence and sampling. Can be used in systems with pressure up to 10 MPa, working temperature in which does not exceed 225 degrees.

   

3. Cranes for underground laying with an extended stem. They are produced in diameters of 50-400 mm for a pressure of 16-40 MPa. The height of the stem varies between 1.5-3 meters. To facilitate manual control (using a standard T-key), a plain bearing made of PTFE is installed on the valve stem. Constructions large diameters(over 200 mm) can be equipped with electric or.

   

4. Cranes with a mechanical gearbox - the line includes fittings with a diameter of 100-300 mm. Due to the presence of the gearbox, the efforts that must be applied when opening the tap are significantly reduced. Also, the reducer prevents the possibility of water hammer in the pipeline. In the standard configuration, the structures are equipped with a ProGear gearbox, however, according to individual orders, it is possible to install a gearbox from third-party manufacturers.

   

5. Combined valves - the series consists of fittings with a diameter of 15-250 mm, working pressure 25-40 MPa. The structures have F/P configuration - one connecting pipe is flanged, the second one is for welding.

Flanged valves have standard connecting dimensions according to GOST No. 12815. The manufacturer uses version No. 1 (with a connecting ledge). This method connection provides the most durable and reliable joint, which is why it is widely used in all areas of industry.

Coupling fittings have an internal thread (VR) of an inch type that meets the requirements of GOST No. 6357. Such fittings are easier to install, however, due to the fact that the thread reduces the thickness of the body walls, sleeve valves have a limited scope.

Valves for welding are designed for installation by electric welding, gas welding can be used when installing structures with a diameter of up to 150 mm. During installation of fittings on horizontal pipelines must be in the open position. On vertical lines, when welding the upper branch pipe, the shutter is open, the lower one is closed. Welded fittings can be used on pipelines whose vibration displacement amplitude does not exceed 0.25 mm.

  Ball valves LD are used in pipelines for the transfer of a wide variety of media: water, gas, oil products, etc. The material for the manufacture of the body are structural steel grades, such as, for example, 09G2S, Art. 20, stainless steel 12X18H10T, etc. ) and stem made of stainless steel 20X13, 40X13. These elements are sealed with elastomer, fluoroplast-4 plastic.

The connection of the LD ball valve to the network is carried out both by welding and in other ways: if it is flanged, then using flanges, if it is coupling, then using a thread. The tightness standard of the valve gate LD corresponds to class A in accordance with GOST 54808-2011. According to climatic version steel ball valves LD for welding can be manufactured both for operation in a temperate climate (category U) and in cold (category HL) in accordance with GOST 15150-69.

The products in question can be controlled by an ordinary handle, some kind of gearbox, as well as a pneumatic or electric drive. Ball valve LD flange must perform its functions at temperatures of -60 ... +200 ° C and -40 ... +200 ° C, depending on its version. Service life is set at least 3 years. Our company supplies steel ball valves LD to consumers in any quantity in a short time.

Depending on the design of the crane, it can be used in various categories of climate, most often it is a temperate climate and a cold climate. The tightness of the gate design according to the standard, corresponding to class A, provides LD ball valves high quality during many years of operation.

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On the Russian market exists big choice shut-off pipeline valves: gate valves various designs, valves, valves, butterfly valves, etc. However, in last years more and more consumers give their preference to ball valves.

LD ball valves have a long service life (5-10 years). This undeniable reliability is ensured by the constant control of blanks for the manufacture of ball valves, as well as materials throughout the entire production process. Each LD steel ball valve is tested for seal tightness and body strength on special test benches. Valves are tested in accordance with GOST 9544-93, which sounds like “Pipeline shut-off valves. Valve tightness standards.

The places of installation and operation of LD ball valves can be pipeline systems of housing and communal services, water pipelines, pipelines for transporting oil, gas and oil products.

The LD steel ball valve has proven to be a reliable shut-off device with a high-quality seal of the stem-throat assembly, the seats in the ball valve are additionally spring-loaded, there are also duplicate seals on the seats, the material of which is coke-filled fluoroplastic made of fluorosiloxane elastomer.

By using LD steel ball valves, you can reduce the cost of maintenance pipeline systems. This is achieved through the use of all-welded technology in the manufacture of ball valves. The result is that such a ball valve is durable and reliable. In the manufacture of LD ball valves, the method of crimping workpieces by cold stamping is used. For the production of KSh, the material is pipe elements of various metallurgical plants. As a result of all of the above, there are no various leakages of the working medium, and this happens if bolted connections are used in the device of other ball valves, maintenance and availability of spare parts and structural elements are not required, and various repair tools and training programs are not required.

Advantages of LD ball valves:

All-welded housing

The all-welded body of the LD ball valve does not have any bolted sockets on the body, through which leakage is possible under dynamic loads of the pipeline. The ball valve does not use cast elements, as in most types stop valves, but cold-formed blanks made from the pipe assortment of the largest domestic metallurgical plants.

Strength

The body of the LD ball valve consists of a central welded spherical part (body) and cylindrical end connections (pipes). The spherical forged design, which does not have bolts, allows, with a minimum wall thickness and minimum weight, to withstand the maximum working pressure and provide maximum resistance to loads.

Tests

Each LD ball valve passes the following acceptance tests

1. air tightness Рpr 6 kgf/cm² at t?+ 20?C
2. Strength and density of water:

* for Ru 1.6 MPa - Rpr 24 kgf / cm²
* for Ru 2.5 MPa - Rpr 38 kgf / cm²
* for Ru 4.0 MPa - Rpr 60 kgf / cm²

No need for maintenance

Since the LD ball valve has a long service life, a robust all-welded construction and no gland seals, it requires no maintenance or spare parts. Thus, there is no need for training programs, special tools and equipment for repairs, storage of spare parts.

High speed shutdown of the flow of the working medium

The LD ball valve is opened or closed by turning the handle through 90°, and more than ten full turns of the handwheel are required to open or close the valve.

Small (in comparison with gate valves) weight parameters of LD ball valves provide a minimum load on the pipeline.

Ease of controls

At high pressures and when the stuffing box is tightly tightened, opening and closing the valves is very difficult due to the small diameter of the flywheel, which leads to the use of additional improvised means. It takes several full turns of the flywheel to open or close. The ball valve is easily opened or closed by turning the stem 90°. At the same time, it is possible to visually determine whether the valve is open or closed.

Temperature resistance of ball valve

The temperature resistance of the ball valve is up to 180°C. A valve (valve) with a rubber seal allows only 70 °C, and a cone valve - no more than 80 °C.

Optimal price-quality ratio”

The price of the gate valve is slightly lower than the price of the LD ball valve, but the cost of installation and maintenance of the valve is much higher than that of the ball valve, which, combined with the high cost of repairing the valve, allows us to conclude that the use of the LD ball valve is more cost-effective.

LLC "ChelyabinskSpetsGrazhdanStroy" is the largest Russian manufacturer of all-welded steel ball valves manufactured since 2003 under the LD trademark.

Ball valves LD- this is a shut-off and shut-off and control valve, which is actively used in the oil and gas industry. In addition, the products are actively used by companies in the housing and communal services sector.

LD ball valves are used on industrial and technological pipelines transporting the following media: gas, oil products, steam, compressed air, drinking and technical water, aqueous solutions, aggressive liquids, alcohol-containing substances.

Ball valves are produced with nominal diameters from 15 to 700 mm, both standard bore and full bore. All models of LD ball valves are available with various types connections - flanged, coupling, welding, with polyethylene pipes for welding to HDPE pipes, as well as combined. Small diameter valves may also have a threaded connection. LD cranes of large diameters can be produced in several versions with different face-to-face lengths, including gate valves. Some models designed for the transport of liquid media have a bleed valve to remove air from the pipeline.

Cranes large diameter are completed with a reducer, the products calculated on installation of the electric drive are also issued.

Ball valves LD can be installed on the pipeline in any position - both horizontally and vertically. The range of permissible temperatures can be from -60°C to +200°C (for valves in a special climatic version). Operating pressure for main shut-off valves is up to 25 bar, some models of small diameter valves are designed for 40 bar, regardless of the temperature of the medium.

Depending on the purpose, the body material is steel of various grades: St.20, 09G2S or 12N18X10T. The body of all models of LD cranes is all-welded, there are no bolted connections in it, due to which the resistance of shut-off valves to dynamic loads is significantly increased. Hull welding is carried out in automatic mode in an inert gas environment, which eliminates the inhomogeneity of the weld. In addition, the design of LD cranes does not use cast elements, as in most analogues, but made by cold stamping.

The key to the quality of products of ChelyabinskSpetsGrazhdanStroy LLC is the constant control of material and workpieces at all stages of the manufacture of LD ball valves, as well as mandatory testing of each LD ball valve on test benches in accordance with GOST 9544-93"Pipeline shut-off valves. Norms of tightness of gates".

The average resource of ball valves is 10,000 cycles of opening and closing, the estimated service life is about 25 years. The manufacturer provides a three-year warranty for each product.