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Butterfly valve
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Butterfly valve

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Product description
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Product introduction: 

I. Overview: the butterfly valve for transformer is installed at the flange connection between the oil tank or pipeline of an oil-immersed transformer and removable component. It is used for opening or blocking oil route of the transformer and serves as the butterfly valve for oil drainage in emergency or maintenance. 

 

II. Product profile 

1. Model description: 

2. Working temperature: -30℃~120℃

3. Sealing pressure: vacuum butterfly valve has no leakage at 0.5Mpa and rigid sealing butterfly valve has no leakage at 0.1Mpa. 

4、Minimum tolerance rating: C4-M of IS012944-6 

 

III. Installation and operation instruction

1. Open-close status of the butterfly valve can be displayed vividly in case the bonnet is removed. When the positioning pin is close to word "OPEN", it indicates the butterfly valve is at open status; when the positioning pin is close to word "CLOSE", it indicates the butterfly valve is at closed status. 

Attention: the red arrow at the revolving shaft head indicates the valve block direction, facing the pipe diameter direction indicating open and vertical with pipe diameter direction indicating closed. 

2. During its installation, the butterfly valve shall be at closed status. Please check whether the installation flange pitch matches with the butterfly valve. Please stop installation immediately, if the flange pitch is incorrect. 

3. During transformer accessory lifting, the butterfly valve needs to prevent stress and knock. Since all sealing rings are made of special rubber, please contact our company, if they are damaged and need to be replaced. 

4. During installation, please make sure the butterfly valve and the inner hole of the flange are concentric and tighten installation bolts evenly to prevent uneven stress from damaging the sealing part of the butterfly valve during tightening. 

5. Open-close methods 

5.1 Use an adjustable spanner to rotate and screw out the bonnet anticlockwise. Remove the bonnet and its sealing part together and keep them properly, without losing. 

5.2 According to the indicated direction of the limit indicator sheet at the valve shaft, the butterfly valve can be opened after rotating 90° anticlockwise and closed after rotating 90° clockwise. 

6. During bonnet installation, pay attention to open-close status of the valve. The red arrow indicates the valve block direction, facing the pipe diameter direction indicating open and vertical with pipe diameter direction indicating closed. Find out the word corresponding to current open-close status of the valve, put the sealing part and expose corresponding word before tightening the bonnet clockwise. 

 

IV. Common fault analysis 

Common fault

Cause analysis

Solution

Open-close fault of valve

Check whether the flange match with the valve or the flange does not match with the inner hole of the valve.
During its rotation, the valve will be held against by the flange and unable to be opened

Please replace with a correct valve.

Oil leakage fault of valve

For leakage at the connection between the valve and the flange, check whether installation bolts of the valve are tightened and whether the sealing part is damaged

Please tighten installation bolts or replace the sealing part of the valve

For oil leakage at the valve block, rigid sealing type butterfly valve is allowed to have certain amount of leakage as per standard.
If leakage does not exceed the standard amount,
the valve can be used; if leakage exceeds the standard amount, it may be caused by long-term abrasion of the valve block.

Please contact our company.

For leakage of the screw stem, it may be caused by damage of the sealing part

Please contact our company to replace the sealing part

 

S.N.

Size DN

Series no

Nominal PressureKPA

Diameter D4

Specifications

Angle

D1

D2

D3

D5/A*A

Shape

Thickness

1

50

1

150

125

4-M12

45

50

68

88

125*125

square

35

2

80

1

150

150

4-M20

45

80

95

115

150*150

square

35

3

80

2

150

160

4-M16

45

80

95

115

150*150

square

35

4

80

3

150

150

4-M20

45

80

95

115

190

circular

35

5

100

1

250

180

8-M16

22.5

100

125

145

220

circular

35

6

125

1

250

200

8-M16

22.5

125

149

169

250

circular

40

7

125

2

250

210

8-M16

22.5

125

149

169

250

circular

40

8

150

1

250

240

8-M20

22.5

150

177

201

280

circular

40

9

200

1

250

295

8-M20

22.5

200

218

250

340

circular

40

10

250

1

250

350

12-M20

15

250

285

312

390

circular

40

We could not find any corresponding parameters, please add them to the properties table
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