Butterfly valve

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.

Keywords

Radiator

Category

Butterfly Valve

Online Message

Detailed description

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