All-welded stainless steel taps. Ball valves LD

Purpose: All-welded flanged valves 11s67p 2TsF (11s67p 2TsP - for welding) are intended for installation on a pipeline as a shut-off device.
Working environment: water, steam, gas, oil, oils, petroleum products, other media neutral to the materials of the valve parts.
Working environment temperature: from minus 40ºС to 180ºС.
Nominal pressure: 1.6 (16); 2.5 (25); and 4.0 (40) MPa (kgf/cm²).
Pipeline connection: flanged, welded.
Material of main parts:
Body, pressure sleeve, handle - steel 20.
Ball - stainless steel 12Х18Н10Т.
Spindle - steel 20Х13.
The saddle is fluoroplastic F4G3K6.
The spindle seal is fluoroplastic F4.
O-ring - rubber IRP1287.
Disc spring - steel 60S2A.
Nut - steel 35. Washer - steel 3.
Shutter tightness: class A according to GOST 9544-2005.
Manufacturer: LLC "Lugansk plant" pipeline fittings"MARSHAL", Ukraine.

All-welded valves 11s67p 2Ts are installed on the pipeline in any position, regardless of the direction of the medium flow. The crane is controlled manually by turning the lever 90º until it stops or using a gearbox by rotating the flywheel. The position of the lever is an indicator of the opening and closing of the tap. In the open position, the lever is located along the axis of the pipeline. If there is a gearbox, the position of the shut-off ball is controlled by an indicator. All-welded ball valves must be fully open or closed during operation. It is prohibited to use a ball valve as a control valve. During installation on the pipeline, the valve must be in the fully open position. Cranes 11s67p 2Ts do not require special maintenance. It is recommended to open and close the tap several times once a month to prevent the formation of deposits on the surface of the ball.

The main overall dimensions and weight characteristics of all-welded flanged ball valves 11s67p 2TsF (11s67p 2TsP - for welding):

All-welded cranes trademark"MARSHAL" have the following types of designs: all-welded flanged ball valve, all-welded ball valve for welding. The valves are made as standard bore valves, i.e. they have an incomplete passage in the body. All-welded ball valves are produced for pressure PN 1.6 (16); 2.5 (25); and 4.0 (40) MPa (kgf/cm²) with diameters DN from 15 to 200 mm, have manual control in the form of a handle (lever). At the customer’s request, the cranes are equipped with a gearbox or connection for an electric drive, and are also made from other steel grades (09G2S, 12Х18Н10Т), including those in compliance with GOST.

All-welded valves are of the type with limited repairability, but they allow replacement of the stem seal without dismantling the valve from the pipeline. Undoubted advantages All-welded taps are characterized by their low metal consumption while maintaining high quality and reliability of the product, which significantly reduces the cost of installing shut-off devices in pipeline systems. Therefore, all-welded cranes of the MARSHAL brand are increasingly used in enterprises of the housing and communal services, heat and power, gas, chemical, oil refining and other industries.

Fitting-tekhkomplekt LLC accepts orders for the manufacture and supply of any valves from the production line of the Lugansk Pipeline Fittings Plant MARSHAL.
Dealer agreements and direct deliveries from the manufacturer allow our organization to maintain competitive, at factory level, prices for MARSHAL TM products.

The manufacturer guarantees that all-welded cranes comply with the requirements technical specifications"TU U 04671406 - 003 - 1999 Ball valve 11s67p."
The warranty period for flanged valves is 18 months from the date of commissioning, but not more than 30 months from the date of shipment by the manufacturer.
The number of operating cycles is at least 10,000.
Full service life is at least 10 years.

I. Semenov, technical specialist of the pipeline valves portal ARMTORG.RU

Recently, more and more excitement in the pipeline fittings market has been observed among the two most common types of ball valves: collapsible (Fig. 1) and all-welded (Fig. 2). Let's figure it out together design differences of these designs, and everyone will make their choice in favor of one design or another.

The first thing we will consider is the materials used.

In both designs, the materials used for the manufacture of the valve are identical, namely: the main elements (neck, body, pipes for an all-welded design, flanges) are made of steel 20 or 09G2S (for climatic version HL), the stem and ball in both cases are made of of stainless steel. Seat seals are made of fluoroplastic F4 or F4K20 in both designs, and, depending on the crane manufacturer, seats made of these materials are installed on both all-welded and collapsible valves. Here it is only worth recalling the best temperature indicators of the F4K20 material versus F4 ( Maximum temperature for F4 - 150 О С, for Ф4К20 - 200 О С). It is also worth noting the existing differences in the neck design in both types of taps. Thus, there is a design where the main sealing elements are O-rings made of special rubber, and a design where fluoroplastic rings, pressed with a nut, act as a seal. The difference in the design of the neck seal is significant. Thus, sealing the neck with rubber rings is more reliable. When sealing the neck with fluoroplastic, there is a need for scheduled inspections of these valves and tightening of the neck nut to ensure tightness during operation.

The issue of inspection is especially acute in the presence of temperature fluctuations in the pipeline, i.e. heating cooling cycles. Thus, at high temperatures, fluoroplastic, pressed by a nut (i.e., in a stressed state) becomes “fluid” and fills all possible spaces in the rod-neck assembly. With subsequent cooling, the fluoroplastic may shrink and the seal of the neck will be broken. But due to the fact that this structure is serviceable, the tightness can be restored by tightening the nut.

Summarizing the first part of the comparison, we can draw the following conclusions:

■ collapsible and all-welded cranes have absolutely identical materials used in production;

■ both designs perform the same functionality and have the same positive aspects relative to other types of pipeline fittings. Namely, the minimum opening and closing time by turning the handle 90 O, the possibility of installation in any position, they have a wide range of DN and PN, the ability to visually determine the position of the shut-off element.

But still these designs differ from each other. Let's figure out why. A collapsible faucet has two non-welded connections (body-flanges) in its design. The body is tightened with pins to the flanges (through a fluoroplastic or paranitic gasket), in which fluoroplastic seats are located. At the same time, the weight of the structure increases, and, consequently, the metal consumption increases by at least one flange for a flanged design (Fig. 1b), and by two flanges for a welded design. Plus the weight and cost of the studs and nuts for tightening the body. As a matter of fact, the following follow from this design difference: by tightening the flanges in which the seats are located to the body to achieve tightness, the rotation force of the ball increases. In an all-welded design, the pressing force of the seats to the ball is always stable. The absence of a disc spring will lead to unstable operation of the faucet at low and high temperatures. The seal between the body and the flange may fail due to temperature fluctuations, but due to the design features, this can be eliminated by tightening the nuts on the studs. It is necessary to understand that this will not restore the crane to full functionality, but will give a small margin of time for installing a new one or repairing an existing one. Little by little we come to another fundamental difference between structures - maintainability.

Thus, an all-welded structure is non-repairable, and a collapsible one - on the contrary (here we will not take into account the extension of the life of a dying faucet with an all-welded structure, with a leak in the neck, which can be eliminated at a short time by changing the upper O-ring made of rubber, because the other two seals are no longer functional).

When it comes to repairing a collapsible faucet, this is a double-edged sword. To repair a faucet, the following four essential items are required:

■ a similar valve (or another type of shut-off pipeline valve) to install it on the pipeline instead of one that has failed during repairs;

■ repair kit(depending on the complexity of the repair, this may only involve sealing the neck and/or seat, or also replacing the ball (but this is a very rare case));

■ competent personnel who can not only disassemble the structure and replace worn parts, but also assemble the crane back so that it also meets all the declared parameters of the manufacturer;

■ operator-specific tools for assembling the valve (torque wrench and device for alignment and parallelism of flanges). Only at first glance it seems that it is simple to assemble the crane. It is necessary to maintain not only a uniform tightening force of all studs, and their number varies depending on the diameter (for example, DN50 is equipped with 4 studs, and the larger the diameter, the more studs), but also to ensure parallelism of the flanges. Parallelism of the flanges and uniform pressing force are factors that ensure the tightness of the valve.

Consequently, repairing a crane in the field, “on the knee,” does not look entirely realistic. In addition, repairmen often face the problem of availability of spare parts not only in their warehouses, but also in the warehouses of suppliers.

How advisable it is to repair a crane is a personal matter for each operator. I would like to note one thing: it is economically feasible to repair a faucet if it is made of stainless steel. After all, the cost of a new crane is very high even in an all-welded design, which cannot be said about cranes made of steel 20 and 09G2S.

Ball valves 11s67p 2CF all-welded standard bore flanged are used as shut-off valves on pipelines in water and gas supply systems, at thermal power plants, in chemical, oil refining, gas and other industries.

All-welded ball valves 11s67p 2CF are universal and are designed to work with liquid and gaseous non-aggressive and non-toxic working media that are neutral to the materials of the valve parts. The crane is controlled manually by turning the handle 90° until it stops. On large diameters from DN-250, turn the shut-off element ball valve produced by a mechanical gearbox. On request, the cranes can be supplied with a drive: pneumatic drive, electric drive, electro-hydraulic drive or pneumatic-hydraulic drive.

The working medium of all-welded ball valves 11s67p 2CF is water, gas and oil products. The body and welding pipes are made of wear-resistant carbon steel 20. Ball valves 11s67p 2CF are produced in the range of diameters DN 15-700 for pressures PN 16/25/40. Working environment temperature from minus 40°С to plus 200°С. The valves are available in full bore or standard bore (reduced) versions. The connection to the pipeline is welded - with welded fittings, which ensures a reliable, durable and leak-tight connection.

The estimated service life of all-welded ball valves "MARSHAL" is at the right conditions operation for at least 30 years.