Fully Rubber Encapsulated Butterfly Valve
Intervalve butterfly valve model IVGE / IVTLE is an economical answer to the corrosion problems faced by chemical process industries with conventional metal seated butterfly valves. The valve's unique design totally eliminates media contact with any metallic surface of the valve. The valve has a fully rubber lined body and a rubber encapsulated disc with a square slot for the drive end shaft.
The integrally molded spherical profile seat with a matching profile on the disc shoulder (both closed die molded) ensures perfect sealing with minimum operating torque and prevents any fluid ingress into the shaft bores.
The valve is available in 'wafer' as well as 'wafer lugged' versions with a host of seat and encapsulation material to cater to the majority of the chemical process industry requirements.
Conformity to codes and standards:
Complies with the requirements of European Pressure Equipment Directive PED 97 / 23 / EC
Complies with the requirements of ATEX 94/9/EC
Complies with the requirements of ATEX 94/9/EC
| General design and manufacture | API 609 Category A |
| Valve face to face dimensions | ISO 5752 Tab. 5 and API 609 Category A |
| Top flange drilling | ISO 5211 Part II |
| Valve inspection and testing | API 598 / ANSI / FCI 70-2 |
| Flange standard conformity | ANSI 150, DIN PN 6 / 10 / 16, JIS 5K / 10K / 16K, BS 10 Tab. D & E |
| WRAS Materials available on request |
Technical specifications
| Valve type | Centric disc butterfly valve with rubber lined body |
| Body type | Single piece, short wafer (IVGE) or wafer lugged (IVTLE) |
| Seat type | Integrally moulded with body |
| Size range | 50 NB to 350 NB |
| Pressure rating | PN10 (max) |
| Operating temperature range | -25C to 180C (Depending on MOC) |
| Seat leakagee | Tight shut off |
| Seat leakage | Tight shut off |
| Operation | Handlever operation for 50NB to 150NB
Worm gear operation for 50NB to 350NB Pneumatic / Electric actuator operation - optional |
| Available material of construction (MOC) | |
| Body/Disc | SGI / CF8 / CF8M |
| Disc | SGI + Rubber encapsulation |
| Seat | AISI 410/17-4ph/AISI316 |
| Other materials available on request |
Dimensions
KEY FEATURES
Full PN 10 pressure rating for the entire range of 50 NB to 350 NB.
Bi-directional valve with sealing capability to hold rated shut off pressure in either direction.
Unique triple sealing system for shaft sealing, eliminates any fugitive emission or secondary leakage.
Self lubricating shaft bearings (PTFE coated stainless steel) for both drive end and non-drive end shaft ensures minimum bearing friction torque.
Square coupling disc drive arrangement eliminates need for taper pins and exposure of metal parts to media.
Spherically profiled seat and disc shoulder contact area ensures perfect sealing around the shaft bore and zero leakage.
External locking arrangement for top shaft to make it blow out proof.
Excellent adaptability for actuated operation through standardised top flange dimensions for actuator mounting.
Seat liner extending on to the flange contact faces of the body eliminates the need for separate flange gaskets.
Controlled compression of the gasket sealing face to offer optimum sealing and prevent gasket face crushing due to over tightening.
Choice of seat and encapsulation material to meet a host of aggressive chemicals.