PTFE Seated Butterfly Valve
MVS Replaceable or Resilient PTFE Seated Butterfly Valve is available in pressure rating of PN 10. MVS PTFE Seat Butterfly Valve is available in Split 2 Piece Body and Disc Material of Cast Iron, SG Iron, Carbon Steel (WCB), SS 304 (CF8), SS 316 (CF8M). Our Resilient Seat Butterfly Valve comes with replaceable PTFE Seat.
MVS PTFE Seated Butterfly Valve Operation options include Lever, Gear Unit, Motorised, Electrical Actuator, Pneumatic Actuator (Double / Single Acting). MVS PTFE Seated Butterfly Valve can also be supplied with special arrangement of Long Neck, Extended Stem, Locking Arrangement, Limit Switch and Chain Wheel Operator.
It 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 on to the flange contact faces, thus eliminating possibility of any media contact with the body metal.
The circularly moulded full back up elastomer and live loaded disc shoulder sealing ensures 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.
Special Alloy PTFE Butterfly Valves : All MVS PTFE Seated Butterfly Valve are available in these Special Alloys like Titanium Alloy, Zirconium Alloy, Nickel Alloy, Hastelloy Alloy, Inconel Alloy, Incoloy Alloy, Monel Alloy, Aluminium Bronze and Duplex Steel.
Design & Testing International Standard of PTFE Seated Butterfly Valve
| Design Standard | : | EN 593 |
| Inspection & Testing Standard | : | BS EN 12266 – I (BS 6755-I) |
| Flange To Flange Distance | : | EN 593 / ISO 5752 Tab 5 & API 609 category A |
| End Connection | : | Wafer and Wafer Lugged |
| : | ANSI B 16.5 Class 150 |
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| Manufacuring Size Range | : | 2″ (DN50) to 12″(DN 300) |
| Pressure Rating of Valve | : | 150# |
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| Valve Operation | : | Manual Flow Control Lever / Worm-Gear Actuator Operated |
| : | Pneumatic Actuator (Single Acting Spring Return / Double Acting) |
| : | Motorized Electrical Actuator Operated Single or Three Phase Power Supply |
| Valve Seat Leakge | : | Leakage Class VI (Zero Leakage) |
MOC (Bill of Material – BOM)
| Body (Split 2 Piece) & Disc | : | ASTM A 126 GR. B / IS 210 GR. FG 200/220/260 (Cast Iron) / Ductile Iron / Nodular C.I. |
| : | ASTM A 216 GR. WCB (Cast Carbon Steel) |
| : | ASTM A 351 GR. CF 8 / CF 8M (SS 304 / SS 316) |
| : | ASTM A 351 GR. CF 3 / CF 3M (SS 304L / SS 316L) |
| : | ASTM A 351 GR. CN7M (Alloy 20)/ ASTM A351 Gr. CF8C |
| : | ASTM A351 Gr. CD4Mcu / ASTM A351 Gr. CK3MCuN |
| : | ASTM A352 Gr. LCA / LCB / LCC (Low Temperature Carbon Steel) |
| : | Aluminium Bronze / Hast Alloy C – 22/276 / Super Duplex Steel |
| : | NACE MR0175 / NACE MR |
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| Stem | : | 304 / 316 (SS 304 / SS 316) – ASTM A 276 T |
| : | 304L / 316L (SS 304L / SS 316L) – ASTM A 276 T |
| : | ASTM A 276 T – 410 (S.S. 410 – 13% Cr. Steel) |
| : | Alloy 20 / Hast Alloy / Monel |
| : | Duplex Steel / Super Duplex Steel |
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| Seat (Replaceable) | : | PTFE / GFT with silicon / viton backup ring |
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Key Features of PTFE Seated Butterfly Valve
- Full PN 10 pressure rating for the entire range of valve sizes from DN 50 to DN 300.
- Bi-directional ptfe seated butterfly valve with sealing capability to hold rated shut off pressure in either direction.
- Circularly molded back up elastomer provides uniform contact pressure over the entire seat, ensuring bubble tight closure every time.
- Unique triple sealing system for shaft sealing, eliminates any fugitive emission or secondary leakage.
- Self lubricated shaft bearings (PTFE coated stainless steel) ensures 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 temperature.
- Disc springs and fasteners standardised on corrosion resistant stainless steel to ensure long service.
- A choice of wide range metallurgy for the disc, to meet any type of aggressive media.
- Choice of liner materials of virgin PTFE or filled PTFE, which also extends on to the flange contact faces.
- Low operating torque enables selection of smaller size actuators.
- Perfect adaptability for conversion from manual to actuated operation due to standardized top flange.