Double Flanged Butterfly Valve – Centric Disc
MVS Integrally Molded Double Flanged Butterfly Valve is available in pressure rating of PN 10, PN 16, Class 150. MVS Resilient Seated Double Flanged Butterfly Valve is available in Body and Centric Disc Material of Cast Iron, SG Iron, Carbon Steel (WCB), SS 304 (CF8), SS 316 (CF8M). Our Flanged Butterfly Valve comes with wide range of Rubber Liner Options like Black Nitrile, EPDM, Viton, Hypalon, Silicon etc.
MVS Rubber lined Double Flanged Butterfly Valve Operation options include Lever, Gear Unit, Motorized, Electrical Actuator, Pneumatic Actuator (Double / Single Acting). MVS Double Flanged Butterfly Valves can also be supplied with special arrangement of Long Neck, Extended Stem, Locking Arrangement, Limit Switch and Chain Wheel Operator.
The most sought after design by desalination plants and utility installations, MVS represents the state of the art rubber lined double flanged butterfly valve, meeting all the user industry requirements.
The double flanged body pattern ensures precise installation in pipeline, and can be used as an end to the line valve if required. The unique feature of this valve, is its adaptability for lined pipes, due to negligible disc protrusion beyond the body laying length. The universal square top shaft on valves up to DN 200, enables easy change over from hand lever operation to actuated operation when required.
Special Alloy Flanged Butterfly Valves : All MVS Double Flanged 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 Double Flanged Butterfly Valve
| Design Standard | : | BS 5155 / API 609 |
| Inspection & Testing Standard | : | BS EN 12266 – I (BS 6755-I) / API 598 / ISO 5208 |
| Flange To Flange Distance | : | As Per ANSI B 16.10 / BS 5155 / API 609 |
| End Connection | : | Double Flanged End (Flange Integral Cast) |
| : | ANSI B 16.5, Class 150 |
| : | BS 10 Table D / E / F / H |
| : | PN 6 / PN 10 / PN 16 / PN 25 |
| : | DIN Standard / JIS Standard / IS Standard |
| Manufacturing Size Range | : | 2″ (DN50) to 50″ (DN 1200) |
| Pressure Rating of Valve | : | 125 Class / 150 Class |
| : | PN 10 / PN 16 / PN 25 |
| 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 Leakage | : | Leakage Class VI (Zero Leakage) |
MOC (Bill of Material – BOM)
| Body & Disc Material | : | ASTM A 126 GR. B / IS 210 GR. FG 200/220/260 (Cast Iron) / Ductile Iron |
| : | 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 / Hastelloy C – 22/276 / Super Duplex Steel |
| : | NACE MR0175 / NACE MR |
| | |
| Spindle/Stem Material | : | 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 / Hastelloy / Monel |
| : | Duplex Steel / Super Duplex Steel |
| | |
| Seat (Bonded / Molded Type) | : | NBR, Buna-N, |
| : | Nitrile, EPDM, Neoprene, Hypalon, |
| : | Silicon, Viton, |
Key Features
Fully rubber lined body, with lining extending up to the flange contact face to make gasket free sealing.
Ideal valve for installation with lined pipes, since the disc chord interference with pipe ID is negligible.
Controlled compression of the gasket face offers optimum sealing and prevents gasket face crushing.
Unique triple sealing system, for shaft sealing to ensure zero secondary leakage.
Self lubricated PTFE lined bearings, for both drive end and non-drive end shafts, ensures minimum bearing friction.
Bi-directional tight shut off sealing from vacuum to rated pressure.
Excellent adaptability for actuated operation through standardized ISO top flange.
Universal top square shaft enabling direct actuator fitment, after removal of Hand lever, for sizes up to DN200.
Choice of seat and disc materials to suit media and operating conditions.
Enables installation close to other pipe fittings, without disc interference.
Preferred design for desalination plants, municipal water supply and Effluent plants.
Adjustable bottom thrust pad / bearing for DN250 and higher to take care of axial thrust loading.
DN600/DN650 size provided with “O Ring holder” type drive end shaft sealing arrangement for extra reliability.