foot valves for water works purposes

IS 4038: Scope - Key Specifications and Tables

Scope (Clause 7.2)

• Purchaser must supply technical details at enquiry/order.
• Final test/analysis values rounded per IS 2:1960 rounding rules.
• Number of significant figures in results should match specified values.

Key Tables and Dimensions

1. Strainer Hole Dimensions (Clause 4.6, Table 5)

2. Maximum Diameter of Valve Ends (Clause 4.5.2, Table 4)

Notes:

• Shapes in figures (e.g., Fig. 3 & 4) are illustrative, not restrictive.
• Purchaser options allowed for some selections (Clauses 4.4.1, 4.4.2, 5.1).

flowchart TD
    A[Purchaser supplies technical info] --> B[Valve design per IS 4038]
    B --> C{Valve Nominal Size}
    C -->|25-50| D[Strainer holes: 10-12 mm]
    C -->|125-250| E[Strainer holes: 16-22 mm]
    C -->|300-450| F[Strainer holes: 22-28 mm]
    B --> G[Max diameter of valve ends per Table 4]

This summary covers the scope-related technical info, key dimensional tables, and

IS 4038: Nominal Sizes and Dimensions Summary

1. Nominal Sizes of Valves (Clause 2.1)

• Standard nominal sizes:
  25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450 mm

2. Strainer Hole Dimensions (Clause 4.6, Table 5)

3. Flange Dimensions and Drilling for 50 & 65 mm Valves (Clause 4.4.2, Table 2)

4. Maximum Diameter of Valve Ends (Clause 4.5.2, Table 4)

IS 4038: Types of Foot Valves — Key Specifications

1. Types of Foot Valves

• Swing Type and Lift Type (Type 1 & Type 2)
  Refer to Fig. 1 to 5 for typical illustrations.

2. Materials for Components (Table 1, Clause 3.1)

3. Maximum Diameter of Valve Ends (D) (Table 4, Clause 4.5.2)

IS 4038: Manufacture and Design Requirements for Foot Valves

Key Material Specifications (Clause 3.1, Table 1)

Additional Notes:

• Material selection ensures durability, corrosion resistance, and proper sealing.
• Thickness and grades are critical for operational reliability.
• Purchaser must specify technical details per Clause 7.2 during ordering.
• Final test values should be rounded as per IS: 2-1960.

Summary Diagram of Components and Materials

graph TD
A[Foot Valve Components] --> B[Housing, Seat Discs, Plates]
A --> C[Hinge Pins, Disc Guide]
A --> D[Strainers]
A --> E[Disc Faces]
A --> F[Flange Jointing]

B --> B1[Grey Cast Iron (FG 200)]
C --> C1[High Tensile Bars (HT 2)]

IS 4038 - Coating and Protection Key Points

Coating Procedure (Clause 5.1)

• Timing: Immediately after casting, before machining and rusting.
• Method: Dip cast iron parts in a tar-based bath at 143–166°C.
• Composition: Regulated to meet coating properties per Clause 5.3.
• Testing: From each bath, test one smallest and one largest piece or a 150×100×100 mm representative casting.

Alternative Coating (Clause 5.4)

• Apply two coats of:
  • Black Japan (Type B, IS: 341-1973), or
  • Paint conforming to IS: 9862-1981.

Strainer Hole Dimensions (Clause 4.6, Table 5)

Summary Diagram of Coating Process

flowchart TD
    A[Casting Completed] --> B[Clean Castings Thoroughly]
    B --> C[Dip in Tar Bath (143-166°C)]
    C --> D[Coating Formation]
    D --> E{Coating Test?}
    E -->|Yes| F[Test Smallest & Largest Pieces]
    E -->|No| G[Proceed to Machining]

This ensures corrosion protection and quality control per IS 4038 standards.

IS 4038 - Testing: Key Points and Specifications

• Clause 7.2: Purchaser must supply technical info at enquiry/order stage for testing requirements.

• Rounding Off (Clause 0.6): Test results must be rounded per IS 2:1960 rules, retaining the same significant figures as specified values.

• Coating & Testing Procedure: Detailed procedures for coating and its testing are specified but not fully listed here. Refer to the relevant clause for exact methods.

• Material Specifications for Testing:

  • Compressed fibre board or rubber: Minimum thickness 1.5 mm, chemically neutral oil impregnated, smooth & hard surface (per IS 638:1979).
  • Other related IS specifications for materials used in testing include:
    • Grey iron castings: IS 2712:1979
    • Galvanized steel sheets: IS 277:1979
    • Various rubber and asbestos fibre jointings per relevant IS codes.

Summary Table: Testing Material Requirements

Rounding Off Rule (IS 2:1960)

• If the digit to be dropped is >5, increase last retained digit by 1.
• If exactly 5, round to nearest even digit.
• Retain significant figures equal to those in the specified value.

flowchart TD
    A[Test Result (Raw)] --> B{Check digit after last significant}
    B -- >5 --> C[Increase last digit by 1]
    B -- =5 --> D[Round to nearest even]
    B -- <5 --> E[Drop digit, retain last]
    C & D & E --> F[Rounded Test Result]

For detailed test procedures, coating methods, and material-specific testing, refer directly to IS 4038 clauses and referenced IS standards.

IS 4038: Marking and Information to be Supplied

1. Information to be Supplied with Enquiry/Order (Appendix A, Clause 7.2)

• Size of valve
• Type of valve:
  • Lift or Swing type
  • Screwed or Flanged type
• Material of disc face: Leather or Rubber
• Material of strainer: Cast iron or Galvanized steel
• Whether flanges should be drilled

2. Marking (Clause 7.1.1)

• Valves may be marked with the Standard Mark indicating compliance with BIS quality and inspection standards.

3. Rounding Off (Clause 0.6)

• Test results must be rounded off per IS 2-1960, retaining the same number of significant digits as the specified values.

4. Strainer Hole Dimensions (Clause 4.6, Table 5)

flowchart TD
    A[Enquiry/Order] --> B{Information to be Supplied}
    B --> C[Size of Valve]
    B --> D[Type of Valve]
    B --> E[Material of Disc Face]
    B --> F[Material of Strainer]
    B --> G[Flanges Drilled or Not]
    H[Valve] --> I[Marking with Standard Mark]

This ensures clarity on specifications and compliance with IS 4038 for valve procurement and testing.

IS 4038 - Information to be Supplied with Enquiry or Order (Clause 7.2, Appendix A):

When placing an enquiry or order for foot valves, supply the following:

• a) Size of valve
• b) Type of valve:
  • Lift type or swing type
  • Screwed type or flanged type
• c) Material of disc face: leather or rubber
• d) Material of strainer: cast iron or galvanized steel
• e) Whether flanges should be drilled

Key Tables from IS 4038:

Strainer Hole Dimensions (Table 5):

Summary:
Provide valve size, type, disc face and strainer materials, and flange drilling status with enquiry/order. Use specified materials per