The AIV model Butterfly dampers, offered by Amco Industrial Valves, 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.

These 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. This is an ideal choice for furnace air flow and combustion control applications.

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.

Industrial valves

Conformity to Codes & Standards

Actuator mounting bracket ISO 5211 Part II
Flange standard conformity ANSI 150, DIN PN 6 /10, BS 10 Table D
Valve Inspection & Testing API 598/ ANSI / FCI : 70-2 (Class II )

Technical Specification

Construction & Type Centric Disc, Seatless Butterfly damper
Body type Narrow wafer single piece
End connection Wafer, sandwiched between flanges
Size range 40 NB to 1200 NB
Maximum operating pressure 0.5 bar (max)
Operating temperature range -25C to 6000 C (depending on MOC)
Operation Manual or actuated with Pneumatic / Electric actuator
Standard Material of Construction (MOC) Body WCB / CF8 / CF8M
Disc CS-IS 2062 / SS 304 / SS 316
Shaft AISI 410 / SS 316 SH