PTFE Lined Butterfly Valve

PTFE Lined Butterfly Valve

Key Features
  • Full PN10 pressure rating for the entire range of valve sizes from DN50 to DN350.
  • Bi-directional valve with sealing capability to hold rated shut-off pressure in either direction.
  • A circularly moulded backup elastomer provides uniform contact pressure over the entire seat without losing shaft bore shape, ensuring bubble-tight closure every time.
  • A unique triple sealing system for shaft sealing eliminates any fugitive emission or secondary leakage.
  • Self-lubricated shaft bearings (PTFE coated stainless steel) for both the drive end and non-drive end shaft ensure minimum bearing friction torque.
  • Live loaded disc shoulder sealing arrangement through pusher and disc springs in both top and bottom shaft bores, acting on PTFE liner ensures leak-free mechanical stem seal.
  • Back up elastomer standardized in Viton to ensure excellent corrosion protection and maximum temperature resistance against media fumes and higher temperatures.
  • Disc springs and fasteners are standardized on corrosion-resistant stainless steel to ensure long service.
  • A choice of exotic metallurgy for the disc, to meet any type of aggressive media.
  • Choice of liner materials of virgin PTFE or filled PTFE, which also extends onto the flange contact faces.
  • Low operating torque enables the selection of smaller size actuators.
  • Perfect adaptability for conversion from manual to actuated operation due to standardized top flange.

Intervale’s PTFE lined Butterfly valve model IVTFE provides an optimum solution to the corrosion problems encountered by the chemical process industries with conventional butterfly valves. The PTFE seat liner covers the entire wetted surface of the body and extends to the flange contact faces, thus eliminating the possibility of any media contact with the body metal.

The circularly moulded full backup elastomer and live loaded disc shoulder sealing ensure bubble-tight closing of the valve with zero shaft leakage. The valve is adaptable for ON/OFF as well as control duty and can be fitted with actuators and accessories as required to meet the specific duty conditions.

Applicable standards

General design and manufacturing
Valve face to face dimensions
Top flange drilling
Valve inspection and testing
Flange standard


EN 593
EN 593 / ISO 5752 Tab 5 & API 609 category A
ISO 5211
EN 12266 Part 1
DIN EN 1092-PN6 / PN10 / PN16, Class 150, IS 6992 Tab 11
/ 17

Technical Specifications

1. Construction type : Centric Disc Butterfly
valve with PTFE lined body
2. Body type & end connection : Short wafer, 2 piece body
3. Seat type : PTFE / GFT with viton backup
4. Size range : DN 50 to DN 350
5. Pressure rating : PN10 (max)
6. Operating temperature range : -250 C to 2000
C (depending on MOC)
7. Seat leakage : Tight shut off
8. Operation :
Handlever for sizes upto DN 200

Worm gear boxes for DN 50  to DN 350

Pneumatic / Electric actuator operation – optional.
9. Standard Material of Construction
Valve Body : SGI / WCB / CF8 / CF8M
Disc : CF8 / CF8M / Other special alloys
Also available with PFA ENCAPSULATION
(IVTFE – E, UP TO DN 200)
Seat : PTFE / GFT
Shaft : SS 410 / SS 316 SH / 17.4 PH

Material Diagrams

Sizes / Dimensions