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        External dimension, flange dimension and bolt hole dimension of telescopic butterfly valve
        Column:Technology Frontier Time:2019-08-23

        Expansion butterfly valve, as a component used to realize on-off and flow control of pipeline system, has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower and so on. The butterfly plate of the telescopic butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc butterfly plate rotates around the axis, and the rotation angle is between 0 ~90 and when the rotation angle is between 0 and 90 the self-operated valve is fully open. This valve is generally installed horizontally.

        Structural characteristics of telescopic butterfly valve:

        The expansion butterfly valve has the characteristics of simple structure, small volume, light weight, low material consumption, small installation size, switching rapidly, 90 degree reciprocating rotation, small driving moment, etc. It is used to cut off, connect and regulate the medium in the pipeline, and has good fluid control characteristics and sealing performance. When the expansion butterfly valve is in full open position, the thickness of the expansion butterfly valve is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has better flow control characteristics. The expansion butterfly valve has elastic seal and metal seal. Elastic sealing valve, sealing ring can be embedded in the valve body or attached to the butterfly plate.

        Metal-sealed telescopic butterfly valves generally have longer life than elastic-sealed valves, but it is difficult to achieve complete sealing. Metal seal can adapt to higher working temperature, while elastic seal has the defect of temperature limitation. If the expansion butterfly valve is required to be used as flow control, the main thing is to correctly select the size and type of the valve. The structure principle of telescopic butterfly valve is especially suitable for making large caliber valves. Telescopic butterfly valves are not only widely used in petroleum, gas, chemical industry, water treatment and other general industries, but also used in the cooling water system of thermal power plants.

        The commonly used telescopic butterfly valves are butterfly valves with pair clamps, manual flanged telescopic butterfly valves and butt welded butterfly valves. The butterfly valve is connected between two pipeline flanges by double-head bolts; the flanged butterfly valve is connected with flanges on the valve, and the flanges on both ends of the valve are connected with pipeline flanges by bolts; the two ends of butterfly valve are welded with pipeline flanges. The streamlined design of butterfly plate can reduce the loss of fluid resistance, so it is an energy-saving product. The valve stem is a through-rod structure. After quenching and tempering treatment, it has good comprehensive mechanical properties, corrosion resistance and scratch resistance. When the butterfly valve is opened and closed, the stem is only rotated but not lifted. The filler of the stem is not easy to destroy and the seal is reliable. Fixed with the butterfly plate cone pin, the extension end is anti-washout design, so as to avoid the valve stem collapse when the connection between the stem and the butterfly plate accidentally breaks.

        1. Small and light, easy to disassemble and repair, and can be installed at any position.

        2. The structure is simple and compact, the operation torque is small, and the 90-degree rotation opens quickly.

        3. Flow characteristic tends to straight line and has good regulation performance.

        4. The connection between butterfly plate and valve stem adopts pinless structure, which overcomes possible internal leakage points.

        5. Seals can be replaced, and the seals are reliable to achieve bidirectional seals.

        6. The butterfly plate can be sprayed with coating according to user's requirements, such as nylon or PTFE.

        7. The valve can be designed as flange connection and clamp connection.

        8. The driving mode can be manual, electric or pneumatic.

        Standard for use of telescopic butterfly valves

        Design criteria: GB/T12238-1989

        Flange connection dimensions: GB/T9113.1-2000; GB/T9113.2-2000

        GB/T9115.1-2000; GB/T9115.2-2000

        Pressure test: GB/T13927-1992; JB/T9092-1999

        Working principle of telescopic butterfly valve

        Expansion butterfly valve is a kind of valve which uses circular butterfly plate as opening and closing parts and rotates with the stem to open, close and adjust the fluid passage. The butterfly plate of the telescopic butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the telescopic butterfly valve body, the disc butterfly plate rotates around the axis, and the rotation angle is between 0 ~90. When the rotation angle is between 0 ~90, the valve is fully open.


         image.png

        Structural diagram of telescopic butterfly valve

        Main technical parameters of telescopic butterfly valve:


        Nominal diameter

        DN(mm)

        50~2000

        Nominal pressure

        PN(MPa)

        0.6

        1.0

        1.6

        Test pressure

        strength test

        0.9

        1.5

        2.4

        Sealing test

        0.66

        1.1

        1.76

        Gas seal test

        0.6

        0.6

        0.6

        Applicable temperature

        ≤80℃

        Applicable medium

        Air, water, steam, gas, oil, etc.

        Driving form

        Manual, worm and worm gear transmission, pneumatic transmission, electric transmission.

         

        Material of main parts of telescopic butterfly valve

        Part name

        Material Science

        valve body

        Cast iron, cast steel, stainless steel, chromium-molybdenum steel, alloy steel

        Disc

        Cast steel, alloy steel, stainless steel, chromium-molybdenum steel

        Seal ring

        Rubber, PTFE, Polylactone, Stainless Steel

        Stem

        2Cr13, stainless steel, chromium-molybdenum steel

        Telescopic tube

        Cast iron, cast steel, stainless steel, chromium-molybdenum steel

        filler

        Flexible graphite

         

        External dimension, flange dimension and bolt hole dimension of telescopic butterfly valve


        Nominal path

        Shape size (reference value)

        Flange size and bolt hole size (standard value)

        H

        H1

        Design Maximum Length

        Design Minimum Length

        Design Length

        A

        B

        0.6MPa

        1.0MPa

        1.6MPa

        millimeter

        D

        D1

        D2

        n-d

        D

        D1

        D2

        n-d

        D

        D1

        D2

        n-d

        50

        80

        309

        186

        156

        171

        180

        200

        140

        110

        88

        4-14

        165

        125

        99

        4-18

        165

        125

        99

        4-18

        65

        95

        337

        190

        160

        175

        180

        200

        160

        130

        108

        4-14

        185

        145

        118

        4-18

        185

        145

        118

        4-18

        80

        98

        347

        198

        166

        182

        180

        200

        190

        150

        124

        4-18

        200

        160

        132

        8-18

        200

        160

        132

        8-18

        100

        114

        373

        228

        188

        208

        180

        200

        210

        170

        144

        4-18

        220

        180

        156

        8-18

        220

        180

        156

        8-18

        125

        128

        405

        240

        201

        220

        180

        200

        240

        200

        174

        8-18

        250

        210

        184

        8-18

        250




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