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Butterfly valve is a type of valve which can be used in a variety of chemical services. They are available with small dimensions allowing for use in areas where space is limited, and they allow a high coefficient of flow.
Butterfly valves are quick opening valves that consist of a metal circular disc or vane with its pivot axes at right angles to the direction of flow in the pipe, which when rotated on a shaft, seals against seats in the valve body. They are normally used as throttling valves to control flow.
At H. P. Valves Pvt. Ltd., Butterfly valves control the flow of gas or liquid by means of a disk, which turns on a diametrical axis inside a pipe or by two semicircular plates hinged on a common spindle, which permits flow in only one direction. These Butterfly valves offer a rotary stem movement of 90 degrees or less, in a compact design. Unlike ball valves, Butterfly valves do not have any pockets in which fluids may become trapped when the valve is closed.
Butterfly valves are available in several body styles and seal types. The flange type or lug style can be held between flanges of any type. Wafer valves are installed between two flanges using bolts or nuts and studs, while lug style valves have metal inserts installed in the valve's bolt holes and the valve is installed between two flanges using a separate set of bolts for each flange. If the wafer style is used, avoid placing it between either slip-on or screwed flange types. Some wafer body styles will not form a proper seal. The wafer style is used more commonly and is cheaper than the lug style. |
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DESIGN FEATURES |
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APPLICATIONS
- Water treatment plants
- Water distribution systems
- Sewage plants
- Power stations
- Chemical industries
- Steel mills
- Sugar factories / Breweries
- Textile industries
- Food processing industries
- Cement industries
- Paper Mill
QUALITY FEATURES
- Excellent flow control in quarter turn operation.
- Compact space saving design.
- Low weight, low maintenance, log service life.
- Both shafts mounted in bearing supports for easy operating torques.
- Replaceable / Bonded seat options.
- Suitable for mounting between all standard flanges.
- Gasket packing not required to install between flanges.
ORDERING DATA
- Size of valve.
- M.O.C. for body, disc & seat.
- If any specific change to standard material of other parts.
- Operation manual / Gearbox / Actuator (give details of Actuator).
- Details of flow medium i.e., name, temperature, pressure.
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| PART |
DESCRIPTION |
STD MODE OF CONSTRUCTION |
OPTIONS |
| 1 |
BODY |
Cast Iron, GG – 25/
IS – 210FG – 260/
BS – 1452 Gr. 260/ |
SG Iron GGG 40
Cast Steel (WCB)
Stainless Steel CF8/CF8m |
| 2 |
DISC |
SG Iron, GGG – 40/
SG – 1865 SG400/12/
BS – 2789 Gr. 420/12 |
Cast Steel (WCB)
Stainless Steel CF8/CF8M
Aluminum Bronze IS 305 Gr2 |
| 3 |
SEAT |
Black Nitrile |
EPDM, Neoprene, Viton, Silicon
Hypalon of as per customer’s
Requirements. |
| 4 |
SHAFT |
AISI 410 |
AISI 304 / AISI 316 |
| 5 |
BEARING |
Self lubricating phosphorous Bronze |
PTFE |
| 6 |
‘O’ RINGS |
Nitrile |
EPDM, Neoprene |
| 7 |
BUSH |
Polyacetal |
PTFE |
| 8 |
TAPER PIN |
AISI 410 |
AISI 304 / AISI 316 |
| 9 |
PLUG |
Carbon Steel |
- |
| 10 |
HAND LEVER |
SG Iron / C.I. |
Cast steel, S.S. |
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DIMENSION CHART
SIZE (DN) |
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| NB |
A |
D |
H |
L |
WT / (Kg) |
| 40 |
33 |
66 |
106 |
250 |
3.1 |
| 50 |
43 |
70 |
113 |
250 |
3.7 |
| 65 |
46 |
76 |
121 |
250 |
4.5 |
| 80 |
46 |
89 |
129 |
250 |
4.8 |
| 100 |
52 |
96 |
147 |
250 |
6.0 |
| 125 |
56 |
109 |
158 |
250 |
7.9 |
| 150 |
56 |
133 |
176 |
315 |
11.0 |
| 200 |
60 |
158 |
200 |
315 |
15.5 |
| 250 |
68 |
194 |
245 |
500 |
27.0 |
| 300 |
78 |
219 |
270 |
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36.0 |
| 350 |
78 |
260 |
321 |
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| 400 |
100 |
290 |
348 |
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| 450 |
108 |
320 |
373 |
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| 500 |
127 |
360 |
410 |
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| 600 |
149 |
420 |
470 |
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TECHNICAL DATA |
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| PRESSURE RATING |
PN 10 & PN 16 |
| PRESSURE TESTING |
a) Body : 1.5 x PN
b) Seat : 1.1 x PN |
| TEMPERATURE |
(-) 40o c to 200o C |
| FACE TO FACE DIMENSION |
ISO – 5752 /IS – 13095/ BS -5155 |
| TO SUIT FLANGES DRILLED AS PER |
IS, ANSI, BS, DIN Standards |
| OPERATION |
Bi-directional |
| PAINTING |
Epoxy coated |
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