The top choice for furnace airflow and combustion control.
The IVR Model butterfly dampers, offered by Intervalve, are essentially seatless butterfly valves intended for low-pressure gas lines and exhaust 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 pipelines.
The body liner, which also functions as the soft seat, comes in a replaceable version and offers – 100% bi-directional sealing against full-rated pressures of up to PN10.
The body is designed for a maximum pressure of 2.5 bar. The disc flat is held in position by a stub shaft with an axial locking arrangement on the top shaft. The top shaft sealing is considered a stuffing box-type gland sealing arrangement, which is field adjustable.
IVR HT series can meet your higher temperature requiremen
IVR HT series can meet your higher temperature requiremen
These dampers have a split seat design to meet the stringent allowable leakage per the FCI 70-2 compliance.
Product Specifications
Design
IV DESIGN
Size Range
DN40 To DN1200
Seat Leakage
CLASS I
Face to Face
IV INTERNAL STANDARD
Operating Temperature
-25° C ~ +600° C.*
Pressure Rating
PN 2.5 & Lower Rating
Testing Standard
API 598, ANSI - FCI 70-2
Flange Standard
ASME 150;DIN PN2.5 / 6 / 10; IS:6392 NP 0.25 / 0.6 / 1.0; BS 10 TAB
Flow Direction
Bi-Directional
Configurations
Wafer-IVR
DN40 To DN1200
Wafer-IVR-HT
DN40 To DN1200
Material of construction
- Body : WCB / CF8 / CF8M
- Disc : WCB / CF8 / CF8M
- Seat : SEATLESS DAMPER
- Shaft : AISI 410 /SS 316 SH /17-4 PH
- Bearing : STEEL BACKED PTFE
- Shaft Sealing : O-rings
- Thrust Pad : SS316+SURSULF
- Fasteners : STAINLESS STEEL 304
Operator
Hand Lever
DN40 To DN600
Gear Box
DN50 To DN1200
Actuator
DN40 To DN1200
