AIL Cast Steel Gate, Globe and Check Valves have established themselves the world over for their quality, reliability and long service. The valves are manufactured to the latest international designs, using advanced manufacturing techniques and stringent quality control checks. The valves are regularly supplied to major Indian and international clients including oil refining companies and EPC contractors. A wide network of distributors ensures the availability of AIL valves anywhere in the world.
AUDCO INDIA LIMITED (AIL) is a leading valve manufacturer, with a strong presence in India and overseas. AIL has three manufacturing facilities located in Southern India. The main plant is located in Manapakkam, Chennai. The two other plants are at Maraimalai Nagar, 40 kilometres south and at Kancheepuram, 70 kilometres west of the main plant. The plants are equipped with modern manufacturing facilities with special-purpose machines, automatic welding equipment, heat treatment furnaces and testing equipment for total control of all manufacturing operations. In-house metallurgical and NDE laboratories, and calibration facilities with modern equipment provide support to ensure the quality of products manufactured. AIL manufactures a wide variety of industrial valves.The Quality Management System in all three plants is certified to ISO 9001:2000 System.
AIL Cast Steel Gate, Globe and Check Valves are offered in a variety of body and bonnet materials to suit different requirements. These materials include Carbon Steel (standard), Alloy Steels and Stainless Steels. For other materials of construction, refer to AIL.
Audco ASA Class 600 cast carbon steel gate valve,with body & bonnet of ASTM A216 Gr. WCB.Trim of Cr.SS. ends flanged and drilled to ASA Class- 600 rising stem.IBR
The API 600 / BS 1873 / BS 1868 family of AIL Gate, Globe and Swing Check Valves is exceptionally sturdy, rugged and durable, with a reputation for quality, integrity and long service. They are designed for tight sealing and ease of operation. The valves are available with flanged ends or butt-weld ends, in pressure ratings from ASME Class 150 to Class 1500, and in a variety of materials of construction. Gate Valves are of flexible wedge, outside screwand- yoke and bolted-bonnet construction. The valves conform to API 600. Globe Valves feature a ball-type disc, outside screwand- yoke and bolted-bonnet construction. They conform to BS 1873 and also meet the general requirements of API 600, including shell wall
thickness and stuffing box dimensions. Check Valves are of swing-type and bolted-cover construction. They conform to BS 1868 and also meet the general requirements of API 600, including shell wall thickness.
The body-bonnet joint for Class 150 gate valves is oval in shape, while for Class 300 and for globe valves, this joint is circular in shape. In 2” (50mm) valves, the bodybonnet joint has a square configuration. Gate valves of Class 150 rating have a flatface joint with a graphite gasket having
metallic inserts. Those of Class 300 rating have a male-female type joint with a spirallywound gasket. Gate valves of Class 600 rating and above have a Ring Type Joint (RTJ). Globe and Check valves in Class 150 and 300 ratings have a male-female type joint with a spirally-wound gasket. Those of Class 600 rating and above have an RTJ.
The body and bonnet are cast with uniform section and generous radius fillets to prevent stress concentration. The castings are precision-machined for high performance. The gate valve body has a straight through port without recesses except at the seat area. This ensures minimum turbulence,erosion and resistance to flow. Long integral guide ribs in the body match with guide slots in the wedge for accurate alignment and guidance. Bonnet castings are of one-piece design, where the yoke is integral with the bonnet for gate valves of sizes up to 12” (300mm). This ensures accurate alignment of stem and a smooth operation. In globe valves of larger sizes and for higher pressure classes of ASME Class 900 and above, the internal part of the body is machined to provide continuous guiding of the disc from the open to the closed position. The check valve body provides a full port without pockets from inlet to the valve seat. On the downstream side, the body has generous proportions to facilitate full swing of the disc to reduce disc erosion and flow resistance.
Back Seat In AIL gate and globe valves, a precisionmachined back-seat bush is threaded in the bonnet and is secured by a tab-weld. tab weld tab Square Joint Circular
AIL gate valves feature a one-piece cast flexible wedge that minimises stress concentration. Wedge flexibility ensures tight seating over a wide range of differential pressures and temperatures. It also adjusts to slight misalignments caused by pipeline deflections and thermal deformation. The
stem-to-wedge thrust is applied close to the wedge centre. This reduces lateral stem loading and provides for more accurate wedge movement.
AIL globe valves feature a ball-type disc that provides a fine grain surface on the taper seat. For severe services that demand hard-faced seats,
a plug-type disc is provided.
The one-piece construction is securely fastened to the hinge by means of a lock nut and pin. The disc is free to rotate to avoid localized wear. The hinge pin offers excellent wear resistance properties.
Cast in austenitic, copper-free ductile iron alloy to provide resistance to heat, corrosion and wear, the Yoke Sleeve in gate valves features a long thread engagement that assures accurate alignment of the stem. Moreover, it can be removed without replacing the bonnet. In gate valves of sizes 150mm and higher in Class 600 rating and above, the yoke sleeve is mounted on thrust bearings to facilitate easy operation. The Yoke Bush of globe valves is also made from ductile iron alloy, and has a long thread engagement for accurate stem alignment. In Class 900 and 1500 ratings,
the valves have a yoke sleeve to facilitate smooth operation.
AIL gate valves and check valves feature a seal-welded seat ring that offers a leakproof design as it eliminates the leakage path between the seat ring and the body. This design is superior to threaded seats which can loosen up due to temperature fluctuations, corrosion or vibration and result in leakage. Threaded seat rings are optional. For 50mm gate valves, the seat ring is flared into the body, while seal welding is optional. AIL globe valves feature a shoulder type, threaded body seat ring which has a wide taper area that provides for ample seating. Slots on the seat ring allow easy in-situ removal for servicing. Threaded seat rings are additionally secured by a tab-weld. Welded seat rings are also availble in AIL Globe Valves.
The standard range of AIL flanged valves in sizes of up to24” (600mm) is finished with end-flanges faced, drilled and spot-faced (or backfaced) to ASME B16.5 Raised Face (RF). Flanges in valves of sizes larger than 24” (600mm) are drilled as per ASME B16.47 Series A (MSS SP 44) or Series B (API 605). Valves in ASME Class 600 and above are offered with RTJ end flanges on request. The standard finish offered on the raised faces is 125-250 microns in Ra (AARH) Spiral Serration. Other finishes can be offered on request.
