The 1986 edition of IS 4038 establishes specifications for foot valves designed for waterworks applications, focusing on preventing backflow and sustaining prime in centrifugal pump suction lines. It outlines requirements concerning design, materials, dimensions, testing protocols, and protective coatings for both swing and lift valve types covering nominal sizes from 25 mm up to 450 mm. This standard is vital for professionals and manufacturers to ensure dependable valve function and system compatibility.
Overview
The 1986 edition of IS 4038 establishes specifications for foot valves designed for waterworks applications, focusing on preventing backflow and sustaining prime in centrifugal pump suction lines. It outlines requirements concerning design, materials, dimensions, testing protocols, and protective coatings for both swing and lift valve types covering nominal sizes from 25 mm up to 450 mm. This standard is vital for professionals and manufacturers to ensure dependable valve function and system compatibility.
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Contents
Structure
This section details the scope of the standard, emphasizing the purchaser's responsibility to provide technical specifications when placing orders or enquiries. It also explains the rounding off of test data in accordance with IS 2:1960 and provides essential tables for strainer hole sizes and maximum valve end diameters for nominal sizes ranging from 25 mm to 450 mm. Illustrative figures and purchaser options for valve features are discussed.
Outlines the nominal valve sizes covered by the standard, including typical sizes from 25 mm to 450 mm. Provides detailed tables on strainer hole dimensions for both circular and non-circular perforations, and flange dimensions with bolt hole patterns for smaller valves (50 mm and 65 mm).
Describes the two primary foot valve types covered: swing and lift (Type 1 and Type 2), supported by illustrative figures. Also specifies materials for various components such as housings, discs, hinge pins, strainers, and disc faces with applicable IS codes and grades.
Details the material standards for major valve components ensuring durability and corrosion resistance, including grey cast iron, high tensile steels, stainless steel, and reinforced rubber. Emphasizes the importance of specifying technical details during procurement and summarizes material requirements for critical parts.
Specifies the coating methods for cast iron foot valves immediately after casting to prevent rusting, including immersion in a tar-based bath at controlled temperatures. Alternative coatings such as Black Japan or standard paints are also described. Testing requirements for coating quality from sample castings are included.
Discusses the necessary testing protocols for valve housings and seats, including hydrostatic pressure tests at specified pressures and durations to confirm leak-tightness and structural integrity. Also covers the rounding off of test results according to IS 2:1960 and material specifications for test samples.
Lists the particulars that purchasers must provide when placing orders or enquiries, such as valve size, type, disc face and strainer materials, and flange drilling preferences. Also explains marking requirements to indicate compliance with the BIS standard and reiterates the rounding off rules for test data.
Summarizes the key information to be submitted by purchasers, including valve size, type (lift or swing; screwed or flanged), materials for disc faces and strainers, and whether flanges are to be drilled. Includes tables listing materials and their corresponding IS codes and grades for valve components.
Frequently Asked
IS 4038 Clause 3.1 Table 1 specifies the following materials: for disc faces, vegetable tanned leather (minimum thickness 3 mm, IS:581-1976), leaded tin bronze (IS:318-1981, Grade LTB 2), and natural rubber reinforced with cotton canvas (IS:5192-1975, Grade 1 Type B); for strainers, grey cast iron (IS:210-1978, FG 200) and galvanized steel (IS:277-1985). These materials provide the necessary durability and sealing properties for foot valves.
IS 4038 addresses swing type (single and double disc) and lift type foot valves intended for water works. Connection types include screwed ends compliant with IS:554-1975 and flanged ends. The nominal size range for screwed end valves is 25 mm to 150 mm, while flanged end valves cover 50 mm to 450 mm. This ensures applicability across a broad spectrum of water supply systems.
Testing involves a hydrostatic pressure test at 0.6 MPa for two minutes applied to the valve body with no leakage or permanent deformation allowed. The valve seat must also be tested by filling the housing with water and observing for five minutes without leakage, followed by applying a 0.2 MPa hydrostatic pressure for two minutes, again ensuring no leakage or distortion. These tests verify the structural soundness and sealing performance of the foot valves.
As per IS 4038 Clause 5.1, cast iron foot valve components should be coated promptly after casting and prior to machining by immersion in a tar-based bath maintained at 143 to 166°C. The coating composition is controlled to meet specified adhesion and protective properties. Additionally, alternative protective coatings such as two coats of Black Japan or suitable paints may be applied. Quality control includes testing representative pieces from each coating bath.
When placing orders, purchasers must provide the nominal valve size, type of valve ends (screwed or flanged), threaded length and hex head height for screwed ends as per standard dimensions, material specifications for components (such as grey cast iron housing and disc face materials), and the valve type (swing or lift). This ensures production meets the dimensional and material standards for reliable valve performance.
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