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Description Kvant Wafer type cast iron EPDM. Butterfly valves manufactured by Promarm

Butterfly valve p is one of the common types of industrial pipe fittings. It will be discussed in this article.


This article is one of printed video course chapters - training "Pipeline fittings: theory and practice of application in industry"

Some items from the catalog:

The shutter is disk rotary. Question theory.

butterfly valve- pipeline fittings, consisting of a shutter (in the form of a disk) and a rod through which a control action is carried out on the disk. The axis of the disk can be located at an angle or perpendicular to the flow of the medium in the pipeline.

The movement of the disc during opening - closing resembles the movement of the wings of a butterfly, hence the rotary valve is also called "butterfly" (English - butterfly valve).

  1. Butterfly valves allow throttling and blocking the flow of the medium, so the butterfly valve can perform two functions. Despite this, the main function of a butterfly valve is to shut off the flow.
  2. The throttling function can be limited, as discussed below.
  3. The butterfly valve is not intended for full regulation of the environment.

Features of the design of the butterfly valve


Butterfly valves are collapsible or non-collapsible.

  1. The collapsible design allows the replacement of the disc seal, stem and disc by the repair services of the enterprise.
  2. The non-separable design provides increased tightness due to the absence of unnecessary connections. Only the disk seal and the disk itself are in contact with the working medium - the medium does not come into contact with the body.

Butterfly valves can include monolithic or removable seals in their mechanism, various cuffs depending on the characteristics of the medium in the pipeline.

Butterfly valve seals and their characteristics

The seat seal is an important part of the butterfly valve, on which its tightness depends. The ways of sealing the butterfly valve are different depending on the purpose of the valve -

  • with elastic seal on the disc,
  • with seal in the body,
  • with a lined jacket in the body,
  • with metal seal, etc.

TO main Butterfly valve seals include NBR, EPDM and Viton sleeves.


Practice shows good the results of using an NBR cuff for compressed air, and due to the high oil resistance of mixtures such as water with oil, water with gasoline, sea water with diesel fuel and other environments at ambient temperatures from -20°С to +80°С.

Sleeves made of EPDM are ideal for neutral liquids, heated industrial water, compounds with glycols at medium temperatures from -40°C to +130°C, as well as a number of other media.

At the same time, Viton cuffs have a good sustainability

  • to oil products
  • some aggressive liquids
  • and gases at a temperature of the working medium from -20°С to +160°С.

NBR- medium temperature from -20°С to +80°С Suitable for air, petroleum-based fluids and other media (on request).

EPDM- medium temperature from -40°С to +130°С. Suitable for water, hot water, process water, glycols, brines, etc. (on request).

viton- medium temperature from -20°С to +160°С. Resistant to petroleum products, mineral oils and greases and other media (on request).

We brought examples only some of the possible media recommended for use with a particular type of cuff.

Regional gas company "Palyur"supplies Butterfly Valves under its own brandPALUR-ZD.

Butterfly valve is an element of pipeline fittings used to block the flow of the medium. The blocking of the flow is carried out using a disk that rotates around its axis. Butterfly valves are used in technological schemes pipelines with large diameters and relatively low pressure, in those nodes where there are no increased requirements for the tightness of fittings.

There are many varieties of butterfly valves. They all differ in the way they are attached; ( flanged, wafer, butt weld), materials of execution of the body and disk; ( cast iron, steel, stainless steel ), sealing materials; management methods; ( handle, reducer, electric, drive, pneumatic drive).

In the company's catalog Palur» Butterfly valves of various types and designs are available:

Butterfly valves, symmetrical

closures PALUR-SD-SM disk rotary symmetric.

  • Connection method- interflange.
  • Nominal diameter- from DN40 to DN1200.

The symmetrical valve is designed with lip seals, while the offset valve uses seats. The sealing collars are manufactured from various materials, the sealing requirements are determined by the composition of the medium (aggressive or non-aggressive media), as well as temperature regime object.

The advantages of symmetrical valves include a lower cost, and the disadvantages - a decrease in the tightness class, compared with eccentric ones.

Double eccentric butterfly valves

PALUR-ZD-2EX butterfly valves are two-eccentric rotary disc valves.

  • Connection methods
  • Nominal diameter- from DN100 to DN2400.

What are the advantages of double eccentric valves? In valves with a displaced eccentricity, the center of rotation of the disk is shifted back relative to the center line and away from the axis of symmetry. This significantly increases the tightness.

Also, this design allows you to use a variety of materials for it, by reducing the zone of mutual contact between the disc and the seat at the time of closing. This reduction prevents seal wear.

All this allows the use of such valves in more severe conditions than similar ones with a symmetrical disk. Double eccentric valves can be used for high temperatures, large numbers of operating cycles, ultra-aggressive working environments, etc.

Butterfly valves

PALUR-ZD-3EX butterfly valves are three-eccentric butterfly valves.

  • Connection methods- interflange, flanged, welded.
  • Nominal diameter- from DN50 to DN2400.

Triple offset valves are used in applications where friction must be completely eliminated. The triple eccentric seal ensures that the sealing surfaces between the body and the disc are completely frictionless during rotation. This, in turn, allows you to completely eliminate abrasion, and get rid of leaks.

The effect of displacement (eccentricity) can be visualized as follows: when the disc is moved to the "open" position, the disc moves away from the body seal much faster, thereby reducing deformation and friction between the disc and the body seal.

The eccentricity allows the body and disc seals to instantly open when opened, and when closed, the sealing surfaces form a much stronger contact. All this leads to a reduction in wear and abrasion of surfaces, which significantly extends the service life of products.

(Watch the video for a better understanding of how the triple eccentric valve works)

Wafer connection

Wafer connection - a fairly common type of connection of pipeline fittings. Wafer type valves do not have their own flanges or threads, they are installed between two flanges and tightened with studs.

The advantage of wafer connections

  • Wide use. The wafer connection is suitable for most process units and working environments.
  • Reducing the construction length of the product, as well as reducing its weight, as a result - a small load on the pipeline, and a lower price.
  • Facilitate installation in limited conditions, the ability to rotate the valve in desired position around the axis of the pipeline.
  • The ability to easily dismantle the desired system unit for repair and cleaning.

Difficulties in installing a wafer valve are in the correct centering, i.e. the location of the valve and flanges relative to each other, as well as in the uniform tightening of the tightening studs. With uneven tightening of the studs in the flange connection, leakage may occur, as well as deformation of the valve body.

flange connection

  • Flange connection of fittings with pipelines is also widespread. To the virtues flange connection applies to:
  • Simplicity of design. Flanged fittings can be easily mounted by a person who does not have special knowledge, skills and abilities, although it is better to entrust such matters to professionals.
  • The ability to easily, quickly, and most importantly - repeatedly, dismantle one or another valve element with a flange connection.
  • Possibility of installation in flammable and explosive areas, due to the absence of the need for welding.

Disadvantages of flange connections

The disadvantages of connections using flanges include an increase in the weight and dimensions of the product, which makes it difficult to install in hard-to-reach places, as well as the possibility of loss of tightness of the connection due to frequent and significant pressure and temperature drops.

Weld connection

Connection for welding (welded) is the most reliable way of mounting valves. The advantages of a welded joint include:

  • Full tightness, subject to high-quality welding work.
  • No need to resort to additional joint seals, and as a result, the impossibility of destruction of these seals in an aggressive environment.
  • Minimum Maintenance. Welded connections do not require maintenance, and also reduce the weight of the product and the load on the pipeline
  • The disadvantages of such a connection include the need to use special equipment, both for installing fittings and for replacing them.
  • The possibility of using fittings at ultra-high steam pressures, as well as in such technical lines in which it is undesirable for the working medium to enter the surrounding atmosphere, due to their toxicity or explosiveness.

Hot offer! Price RUB 52,000.00

Shut-off and control valve 25ch945p Du50 Ru16 Km-40 with actuator ST 0.1 498.0-0QESB/08 (with current sensor)

print version

Wafer type valves BURACCO (France)

Short description

Butterfly butterfly valves with soft lip seal manufactured by BURACCO France are used in heating, water supply, ventilation and air conditioning systems.

A wide range of sleeve materials allows the use of butterfly valves for food products, sea water, natural gas, oils, petroleum products, aggressive and abrasive media.

The shutters are controlled manually or by means of an electric and pneumatic drive.

Butterfly valves are a good alternative to gate valves, valves, ball valves and have the following advantages:

  • low price;
  • small dimensions and weight;
  • high maintainability;
  • ease of use and installation.

    • Price list for shutters BURACCO

    Prices are set in EUR/1 piece. in a warehouse in Moscow. wholesale buyers discounts are provided.
    Doo 32/40 50 65 80 100 125 150 200 250 300
    Series 600 (body GG 25)
    610 V
    620 V    		 41,12 41,12 43,58 44,45 49,53 81,02 91,35 170,63 - -
    613B
    623B    		 44,80 44,80 46,90 47,43 51,80 73,68 81,90 155,23 270,20 343,53
    614 B
    624B    		 53,90 53,90 53,90 57,23 66,50 107,45 121,10 227,15 511,00 680,75
    Series 600 - for gases (body GG 25) max. pressure = 6 bar
    670 bg 60,55 60,55 70,00 74,20 91,00 118,30 131,36 259,68 - -
    673 BG 58,40 60,32 66,88 70,40 84,16 101,44 122,56 237,12 - -
    610 BG 49,92 50,40 51,20 53,92 57,44 82,08 93,92 157,70 - -
    613 BG 52,80 53,12 54,08 56,48 58,56 75,36 85,12 133,76 - -
    Series 900 - (body GGG 40)
    910B
    920b    		 47,20 53,76 58,72 58,88 64,96 92,80 102,24 184,96 - -
    913B
    923B    		 49,92 55,36 61,44 61,44 65,92 86,08 93,60 170,88 - -
    914B
    924b    		 57,28 61,76 66,88 69,12 77,76 116,96 129,44 236,64 - -
    Series 900 - for gases (housing GGG 40) max. pressure = 6 bar
    970b 59,84 72,16 80,00 83,84 99,52 131,68 152,80 287,84 - -
    973B 63,20 75,20 83,04 86,56 101,60 125,12 144,32 273,60 - -
    Series 800 - check valve (body GGG 40)
    814
    824     		- 30,72 34,72 36,16 40,48 53,76 61,44 82,72 - -
    813
    823     		- - - - - - - - 211,20 282,24

    Make an order

    We would like to present to your attention the catalog for butterfly valves manufactured by PromArm LLC, Penza under the PA trademark.

    Gate valves PA 200

    Lined Butterfly Valves
    PA 200 series
    DN 40 - 1000 mm
    PN 10, 16 kgf/cm2

    Gate valves PA 300

    Butterfly valves series PA 300
    DN 40 - 1200 mm
    PN 10, 16 kgf/cm2

    Gate valves PA 400

    Butterfly valves with double eccentricity series PA 400
    DN 50 - 1000 mm
    PN 10, 16, 25 kgf/cm2

    Gate valves PA 600

    Butterfly valves series PA 600
    DN 40 - 1200 mm
    PN 6, 10, 16, 25 kgf/cm2

    Gate valves PA 700

    Butterfly valves with double eccentricity series PA 700
    DN 100 - 2400 mm
    PN 6.10.16.25 kgf / cm 2

    Gate valves PA 900

    Butterfly valves with triple eccentricity series PA 900
    DN 50 - 2000 mm
    PN 6, 10, 16, 25, 40, 63, 100 kgf/cm2
    Butterfly valve catalog Questionnaire for ordering butterfly valves
    Reference-list Questionnaire for ordering control columns for butterfly valves

    For 13 years, the company has been actively engaged in the supply of industrial pipeline fittings. Based on needs modern market, it was decided to create own production for the manufacture of butterfly valves. As a result of many years of experience, our employees have developed specifications TU 3700-001-55604618-2013, on the basis of which they are produced.

    Our valves are used in various industries industry - oil and gas, chemical, energy, public utilities, mechanical engineering, metallurgy, shipbuilding. PA series valves can be used on the following media: water, steam, gas, oil products, acids and alkalis, sea water.

    Gates can be equipped with gearboxes, electric drives, pneumatic drives, control columns, mating flanges and fasteners. The seal tightness class is A according to GOST R 54808-2011. Climatic version - U, UHL, T, TM according to GOST 15150-69. Gates are used as shut-off and control valves.

    The quality of PromArm valves meets all applicable requirements and is confirmed by the Declaration of Conformity technical regulations TS 010/2011 "On the safety of machinery and equipment" and TS 032/2013 "On the safety of equipment operating under excessive pressure".

    In case of any special requirements for the proposed valves, our company is ready to consider any of your wishes and manufacture products with your parameters.