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The IVR model Butterfly dampers, offered by Intervalve India
are essentially seatless Butterfly valves intended for low
pressure gas lines and air lines. The lightweight construction
with the narrow wafer body enables easy fitment of these valves
in ducts, manifolds and exhaust lines without additional support
or strengthening of pipe lines.
IVR valves are primarily intended for low - pressure large
volume gas / air flow control applications. The absence of
seat substantially reduces the valve operating torque requirements
and makes the valve very effective for flow control / regulation
duties. IVR is an ideal choice for furnace air flow and combustion
control applications.
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Even though the body is designed
for a maximum pressure of 2.5 bar the maximum shut off pressure
is limited to 0.5 bar only .The disc flap is held in position
by a stub shaft with an axial locking arrangement provided on
the top shaft. The top shaft sealing is through stuffing box
type gland sealing arrangement, which is field adjustable.
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Actuator mounting bracket
Valve Inspection & Testing
Flange standard conformity
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ISO 5211 Part II
API 598/ ANSI / FCI : 70-2 (Class II )
ANSI 150, DIN PN 6 /10, BS 10 Table D |
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1.
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Construction & Type |
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Centric Disc, Seatless Butterfly damper
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| 2. |
Body type |
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Narrow wafer single piece |
| 3. |
End connection |
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Wafer, sandwiched between flanges |
| 4. |
Size range |
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40 NB to 1200 NB |
| 5. |
Maximum operating pressure
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0.5 bar (max) |
| 6. |
Operating temperature range |
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-250 C to 6000
C (depending on MOC) |
| 7. |
Operation |
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Manual or actuated with Pneumatic
/ Electric actuator |
| 8. |
Standard Material of Construction
(MOC) |
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Body |
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WCB / CF8 / CF8M |
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Disc |
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CS-IS 2062 / SS 304 / SS 316 |
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Shaft |
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AISI 410 / SS 316 SH |
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- Lightweight design suitable for mounting in ducts, exhaust
lines and ventilation pipes.
- Very low operating torque due to seatless construction.
- Ideal for flow control / modulating duties in low pressure
gas lines.
- Very low pressure drop in open condition.
- Wide operating temperature range to cater to exhaust &
flue gas control lines.
- Zero external leak due to the stuffing box type gland
sealing arrangement.
- Perfect adaptability for manual or actuated applications.
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