Ball valves flanged ld water. LD cranes. Ball valves LD

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

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

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

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

Cranes large diameter are completed with a gearbox; products designed for the installation of an electric drive are also produced.

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 cranes in a special climatic version). The working pressure for the main shut-off valves is up to 25 bar, some models of small-diameter valves are designed for 40 bar, regardless of the medium temperature.

Depending on the purpose, the body material is steel of various grades: St.20, 09G2S or 12N18X10T. The body of all models of LD valves is all-welded, there are no bolted connections, which significantly increases the resistance of valves to dynamic loads. Welding of housings is carried out automatically in an inert gas environment, which eliminates the inhomogeneity of the weld. In addition, in the construction of LD cranes, not cast elements are used, as in most analogues, but manufactured by cold stamping.

The guarantee of the quality of the products of ChelyabinskSpetsGrazhdanStroy LLC is the constant control of material and workpieces at all stages of manufacturing LD ball valves, as well as mandatory testing of each LD ball valve for test benches according to GOST 9544-93"Pipeline valves. Standards of tightness of gates".

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

The LD brand ball valve has two bore standards: standard bore and full bore. Standard bore steel LD valve has inner diameter the holes in the ball are one GOST size less than the diameter of the pipe being connected. The dimensions of the hole diameter of the full-bore valve coincide with the diameter of the pipe, which entails large dimensions, weight and price list of the product.

The stem in the product can be significantly lengthened, which is convenient if access directly to the valve is limited due to the peculiarities of the installation of the system. Also, a steel ball valve of the LD brand can be ordered with a mechanical gearbox, which is relevant for valves of large diameters and high pressures.

Materials (edit)

Ball valves of the LD brand use a unified set of materials in their design. The body of the part is made of steel 20, cold-resistant 09g2s or stainless steel 12x18n10t. Stem and ball made of of stainless steel 12x18n10t or 20x13. The stem is sealed with fluorosiloxane elastomer, and the ball is also a plus for double protection with fluoroplastic. The ball valve under the LD brand is supplied with a handle with a polymer tip.

Attachment types

Ball valves are produced by the company in three main forms of fastening: flanged, socket and welded, and LD also offers valves with combined fasteners and drain valves. Ball valve LD steel flanged is distinguished by high reliability and dismountable connection. The installation of such a crane is advisable in rooms where there are restrictions on welding, on technological lines that imply periodic dismantling and maintenance of the pipeline system. Flanged valves presented up to a diameter of 600-700 mm.

A valve with a welded joint is relevant when maximum tightness is required. This type is in demand on main pipelines, in systems with a large passage diameter, as well as in conditions where water hammer in the pipeline system is not excluded. Welded valves can be purchased with diameters from 15 to 600 mm.

The coupling is presented for valves with a diameter of up to 80-100 mm, depending on the calculation for gaseous or liquid media. This is due to the calculation for a lower pressure of the medium and reduced qualities of tightness. The advantage of these valves is easy assembly with piping, easy disassembly and reusability.

The flanged ball valve in the LD brand is also produced with a combined fastening, where on one side there is a flange, and on the other, a welded connection. This connection is very convenient when changing from a main pipeline to a local process line system.

The choice of a specific crane model must be carried out as carefully as possible, given that the cost of an accident with the wrong choice can be very high.

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On Russian market exists big choice shut-off pipeline fittings: 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 long term service (5-10 years). This undeniable reliability is ensured by continuous monitoring of the ball valve blanks and materials throughout the entire manufacturing process. Each LD steel ball valve is tested for valve tightness and body strength on special test stands. The valves are tested in accordance with GOST 9544-93, which sounds like “Pipeline shut-off valves. Valve tightness standards ".

Places of installation and operation of ball valves LD can serve as pipeline systems of housing and communal services, water pipelines, pipelines for the transportation of oil, gas and oil products.

Steel ball valve LD has established itself as a reliable locking device, which has a high-quality seal of the stem-neck 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.

Using LD steel ball valves 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 cold stamping method is used. For the production of KSh, the material is tubular elements of various metallurgical plants. As a result of all of the above, various leaks of the working environment do not occur, and this happens if bolted connections are used in the device of other ball valves, maintenance and the availability of spare parts and structural elements are not required, and a variety of repair tools and training programs are not required.

Advantages of LD ball valves:

All-welded body

The all-welded body of the LD ball valve does not have any bolted connectors on the body through which leakage is possible under dynamic pipeline loads. The ball valve uses not cast elements, as in most types of valves, but cold-pressed 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 with no bolt connectors allows for minimum thickness walls and minimum weight to withstand the maximum working pressure and provide maximum resistance to loads.

Testing

Each LD ball valve passes the following acceptance tests

1.for air tightness Рпр 6 kgf / cm² at t? + 20? C
2.for strength and density with water:

* for PN 1.6 MPa - Rpr 24 kgf / cm²
* for PN 2.5 MPa - Рпр 38 kgf / cm²
* for Рn 4.0 MPa - Рпр 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 packing, it does not require maintenance or spare parts. Thus, there is no need for training programs, special tools and equipment for repairs, storage of spare parts.

High flow shut-off rate

The LD ball valve can be opened or closed by turning the handle 90 °, and opening or closing the valve requires more than ten complete turns of the handwheel.

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

Ease of controls

At high pressures and when the gland is tightly tightened, the opening and closing of the valves is very difficult due to the small diameter of the flywheel, which leads to the use of additional improvised means. Several full turns of the handwheel are required to open or close. The ball valve can be easily opened or closed by turning the stem 90 ° degrees. In this case, it is possible to visually determine whether the tap is open or closed.

Temperature resistance of the 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 installation and maintenance costs of the gate valve are much higher than the similar costs for the ball valve, which, combined with the high cost of repairing the gate valve, allows us to conclude that the use of the LD ball valve is more economical.

Ball valves LD used in pipelines for the transmission of a wide variety of media: water, gas, oil products, etc. The materials for the manufacture of the body are grades of structural steels, such as, for example, 09G2S, st.20, stainless steel 12X18H10T, etc. Ball valve LD has an actuator (ball ) and a rod made of stainless steel 20X13, 40X13. These elements are sealed with elastomer, PTFE-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 by means of flanges, if it is coupling, then by means of a thread. The tightness rate of LD valves corresponds to class A in accordance with GOST 54808-2011. By climatic performance ball valves steel LD for welding can be manufactured both for operation in a temperate climate (category Y) and in a cold one (category HL) in accordance with GOST 15150-69.

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

Depending on the version in which the crane is made, it can be used in various climatic categories, more often it is a temperate climate and a cold climate. The sealed design of the valve according to the standard, corresponding to class A, ensures that the ball valves LD high quality during many years of operation.