The IS 9338:1984 standard defines specifications for cast iron screw-down stop valves and combined stop and check valves intended for waterworks applications. It details the requirements for design, materials, dimensions, testing, and identification to guarantee consistent quality and performance at designated pressure ratings. This code is vital for producers, vendors, and engineers engaged in water supply systems to ensure uniformity and reliability.
Overview
The IS 9338:1984 standard defines specifications for cast iron screw-down stop valves and combined stop and check valves intended for waterworks applications. It details the requirements for design, materials, dimensions, testing, and identification to guarantee consistent quality and performance at designated pressure ratings. This code is vital for producers, vendors, and engineers engaged in water supply systems to ensure uniformity and reliability.
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Frequently Asked
According to IS 9338 Clause 5.1 and Table 1, the valve body, bonnet, handwheel, and gland are made from cast iron conforming to IS 210-1978 FG 200 grade. The stem is manufactured from either high tensile brass per IS 320-1980 HT 2 grade or stainless steel as per IS 6603-1973 with grades 04Cr18Ni10 or 04Cr17Ni12 Mo 2. This ensures strength, corrosion resistance, and durability suitable for waterworks valves.
IS 9338 specifies nominal pressure (PN) ratings corresponding to valve sizes. Valves up to and including 150 mm nominal size have a pressure rating of 1.6 MPa, while sizes from 200 mm to 300 mm are rated at 1.0 MPa. These classifications standardize dimensions and pressure capabilities to ensure compatibility and interchangeability across different manufacturers.
The standard requires hydrostatic testing comprising body tests, seat tests, and where applicable, back seat tests. Tests are conducted under specified gauge pressures for defined durations—e.g., body tests at 2.4 MPa for 5 minutes for 1.6 MPa rated valves. Throughout testing, valves must exhibit no leakage and maintain pressure without drop, confirming their integrity and sealing performance.
IS 9338 mandates that valves include an integral back seating surface within the bonnet to engage a corresponding seat on the stem or disc assembly when fully open. Disc assemblies may be integral or two-piece but must not separate during service. Disc faces can be integral or fitted with separate facing rings secured by screwing or press fitting. Various disc types such as cone with guide wings, flat face with L-shaped rings, ball type, or non-return types are illustrated, with dimensions and minimum requirements being binding.
Interchangeability is guaranteed by stipulating uniform dimensions, pressure ratings, and material specifications across all valves of the same size and type from any manufacturer. Clause 6.14 requires parts to be mutually replaceable. Standardized manufacturing practices, including consistent use of materials per Table 1 and adherence to defined tolerances, support this. Additionally, marking requirements help confirm compliance, facilitating maintenance and part replacement.
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