The IS 5312 Part 2 (1986) standard defines the specifications for multi-door swing check (reflux) valves intended for waterworks applications, covering nominal sizes from 400 mm up to 1,200 mm. It details the design parameters, material requirements, dimensional tolerances, testing protocols, and marking instructions to ensure effective unidirectional flow control and protection against water hammer in large diameter pipelines.
نظرة عامة
The IS 5312 Part 2 (1986) standard defines the specifications for multi-door swing check (reflux) valves intended for waterworks applications, covering nominal sizes from 400 mm up to 1,200 mm. It details the design parameters, material requirements, dimensional tolerances, testing protocols, and marking instructions to ensure effective unidirectional flow control and protection against water hammer in large diameter pipelines.
الجمهور
المحتويات
الهيكل
This section covers the applicability of the standard to multi-door swing check valves for waterworks ranging from 400 mm to 1,200 mm nominal diameter, specifying key dimensional values such as flange-to-flange length, overall height, centre height from duck foot, and size of duck foot, along with tolerance limits on face-to-face dimensions and minimum finished valve mass.
Defines valve pressure classes based on nominal pressure ratings (PN 0.6 and PN 1.0), outlining dimensional details and minimum weights for each size category.
Lists the available nominal sizes and references applicable standards (IS 1538 Parts 4, 5, and 6) for dimensional conformity and flange drilling requirements.
Specifies primary and alternative materials for key valve parts including body, hinge pin, bolts, nuts, bearing bushes, face and seat rings, and flange jointing material, emphasizing purchaser approval for alternatives.
Details dimensions and tolerances for flanged ends of valve bodies, including face-to-face length tolerances and flange drilling standards.
Describes dimensional tolerances, valve size specifications, and minimum finished mass requirements to guide fabrication and quality control.
Outlines the cleaning, coating process involving tar-based dipping, coating types accepted, and sampling for quality assurance alongside pre-coating hydrostatic testing.
Specifies testing procedures, test pressures, durations, and criteria for body and seat leakage tests to confirm valve integrity prior to coating.
Covers inspection criteria for dimensions, materials, and test results, ensuring compliance with IS 5312 Part 2 specifications.
Describes cleaning, draining, packaging, and optional sealing of valve ends to protect against damage and contamination during transit and storage.
Lists the details the purchaser must communicate when ordering valves, such as nominal size, class, special requirements, by-pass connections, test certificates, inspection requests, and sealing preferences.
Explains optional marking with the BIS Standard Mark and typical markings including manufacturer identification, valve size, pressure rating, and standard number.
الأسئلة المتكررة
Per IS 5312 Part 2 (Clause 4.1 and Table 1), the valve body with hinge and diaphragm is typically made from grey cast iron (IS 210: FG 260), with alternatives such as spheroidal graphite iron or cast steel requiring purchaser approval. The hinge pin uses high tensile brass (IS 320 / IS 6912) or stainless steel alternatives. Bolts and nuts are carbon steel per IS 1367 standards. Bearing bushes and face and seat rings are made from leaded tin bronze or may use austenitic iron, PTFE, or stainless steel variants. Flange jointing materials are rubber as per IS 638. Approval is necessary for alternative materials to ensure durability and corrosion resistance.
IS 5312 Part 2 applies to multi-door swing check valves intended for waterworks with nominal diameters ranging from 400 mm to 1,200 mm. Dimensional requirements adhere to IS 1538 Parts 4, 5, and 6, which specify nominal sizes, face-to-face lengths, flange dimensions, and drilling patterns to maintain uniformity in large diameter valves.
Valves must undergo hydrostatic testing prior to coating, including a body test and a seat leakage test, each performed at specified pressures and durations based on the valve's pressure class (PN 0.6 or PN 1.0). The seat test involves positioning the valve horizontally with the outlet filled with water and assessing for leaks over a minimum duration of 2 minutes. The body test requires filling the valve body with water and ensuring no leakage or permanent deformation occurs under test pressure.
Immediately following casting and prior to machining, cast iron components are thoroughly cleaned and then immersed in a tar-based bath maintained between 143°C and 166°C to apply a protective coating. The coating process ensures resistance to corrosion, as verified by sampling and testing. After hydrostatic testing, valves receive either two coats of black Japan paint or coating compliant with IS 9862 to provide durable corrosion protection.
The purchaser must specify the nominal size and class of the valve, intended use or material requirements if applicable, any required by-pass arrangements, whether a test certificate is needed, inspection or witnessing of tests requirements, and if the valve body ends should be sealed for shipment. Any requests for additional testing beyond standard hydrostatic tests must also be clearly communicated.
اسأل AI عن أي بند، متطلب، أو حكم في IS 5312 PART 2. احصل على ردود فورية مع الاستشهاد بالبند مدعومة بمكتبتنا المفهرسة.
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