Swing Check Type Reflux (non-return) Valves for Water Works Purpose, Part 2: Multi-Door Pattern

IS 5312 Part 2 - Scope: Key Dimensions & Specifications for Sluice Valves

1. Dimensions of Valves (Clause 5.3, Table 2)

2. Tolerances on Face-to-Face Dimensions (Clause 5.4)

3. Minimum Finished Mass of Valves (Clause 6.10)

IS 5312 Part 2: Key Specifications for Class of Valves

1. Class of Valves (Clause 2.1)

• Valves are classified by Nominal Pressure (PN), the max permissible gauge pressure in MPa:
  • PN 0.6
  • PN 1.0

2. Valve Dimensions (Clause 5.3, Table 2)

3. Minimum Finished Mass (Clause 6.10)

IS 5312 Part 2: Nominal Sizes & Dimensions Summary

• Nominal Size: Refers to the nominal bore of the waterway (Clause 3.1.1).

• Available Nominal Sizes (Clause 3.1):
  400, 450, 500, 600, 700, 750, 800, 900, 1000, 1100, 1200 mm

• Dimensional Specifications (Clause 5.3, Table 2):
  Dimensions of valves for nominal sizes are given as follows (all in mm):

• Reference Standards for Dimensions (Clause 5.1.1):
  Dimensions should comply with IS 1538 (Parts 4, 5, 6) unless otherwise specified.

Visual Concept: Valve Dimension Parameters

graph LR
A[Length Over Flanges (A)] --> Valve[Valve Body]
B[Overall Height (B)] -->

IS 5312 Part 2: Materials for Reflux Valves (Clause 4.1, Table 1)

Notes:

• Approval from purchaser required for use of alternative materials.
• Materials selected ensure durability, corrosion resistance, and mechanical strength suitable for valve components.

Related Dimensions (Clause 5.3, Table 2)

| Size (mm) | Length over Flanges (A) | Overall Height (B) | Height of Centre from Duck

IS 5312 Part 2: Flanged Body Ends - Key Specifications

1. Dimensions of Flanged Body Ends (Table 2, Clause 5.3)

2. Face-to-Face Dimension Tolerances (Clause 5.4)

3. Materials for Components (Clause 4.1, Table 1)

IS 5312 Part 2 - Design & Manufacture Key Data

1. Face-to-Face Dimension Tolerances (Clause 5.4)

2. Valve Dimensions (Clause 5.3, Table 2)

3. Minimum Mass of Valves (Clause 6.10)

IS 5312 Part 2 – Key Specifications for Coating

Coating Process (Clause 7.1)

• Cleaning: Cast iron parts must be thoroughly cleaned immediately after casting and before machining.
• Coating: Dip parts in a tar-based bath at 143–166°C.
• Coating properties: As per Clause 7.3 (not detailed here), ensure proper adhesion and corrosion resistance.
• Sampling: Test smallest and largest size valves or representative test piece (150 x 100 x 10 mm) from each bath.

Coating Types (Clause 7.4)

• Apply two coats of black Japan (Type 3, IS:341-1973)
  OR
• Paint conforming to IS:9862-1981 (ready mixed, brushing, bituminous, black, lead-free, acid/alkali/water/chlorine resistant).

Testing Before Coating (Clause 8.1 & Table 3)

• Hydrostatic test with water before coating.
• Test pressure & duration:

Summary Diagram: Coating Workflow

flowchart TD
    A[Cast Iron Parts] --> B[Cleaning]
    B --> C[Dip in Tar Bath (143-166°C)]
    C --> D[Coating Test on Samples]
    D --> E[Hydrostatic Test (Water)]
    E --> F[Apply 2 Coats Black Japan or Paint]
    F --> G[Final Inspection]

References:

• IS 5312 (Part 2) - 1986
• IS 341-1973 (Black Japan)
• IS 9862-1981 (Paint)

IS 5312 Part 2 — Testing of Valves

Key Testing Clauses & Specifications

• Clause 8.1: Every valve must undergo hydrostatic testing before coating.
• Test Medium: Water.
• Test Duration: 2 minutes per test.

Hydrostatic Test Types & Pressure (Gauge) — Table 3

Test Descriptions

• Body Test (Clause 8.3): Body fully filled with water; no leakage or permanent distortion at test pressure.
• Seat Test (Clause 8.2): Valve horizontal, outlet filled with water, inlet open to atmosphere; no leakage through seats under test pressure.

Valve Dimensions (Clause 5.3, Table 2)

Inspection & Testing per IS 5312 Part 2

Key Specifications:

• Dimensions of Valves (Clause 5.3, Table 2):

• Materials (Clause 4.1, Table 1):

• Testing (Clause 8.1, Table 3):

IS 5312 Part 2: Preparation for Despatch – Key Points

• Clause 10.1:
  After testing, valves must be:

  • Drained of all fluids
  • Cleaned thoroughly
  • Prepared and packed to minimize damage and deterioration during transit/storage

• Clause 10.3:
  When specified, body ends shall be sealed to prevent ingress of foreign matter during transit and storage.

• Clause 5.1.1:
  Unless otherwise specified, valve dimensions must comply with:

  • IS 1538 (Part 4, 5, 6) – covers valve dimensions and tolerances.

Summary Table: Preparation for Despatch

Practical Notes:

• Use corrosion-inhibiting materials for packing if long storage is expected.
• Sealing can be done using plastic caps, plugs, or protective coatings.
• Hydrostatic test residues must be fully drained to avoid corrosion.

flowchart TD
    A[Valve Testing Completed] --> B[Drain Fluids]
    B --> C[Clean Valve]
    C --> D{Seal Body Ends?}
    D -- Yes --> E[Seal Ends to Exclude Foreign Matter]
    D -- No --> F[Skip Sealing]
    E --> G[Pack Valve Securely]
    F --> G
    G --> H[Dispatch]

This ensures valves arrive in good condition, meeting IS 5312 Part 2 standards.

IS 5312 Part 2 - Key Information for Purchaser & Valve Dimensions

Information to be Supplied by Purchaser (Clause 11.1)

Purchaser must specify:

• Nominal size of valve
• Class of valve
• Purpose or material specs (if possible)
• By-pass arrangement (if needed)
• Requirement of test certificate
• Requirement for inspection or witnessing tests
• Whether body ends should be sealed for dispatch

Valve Dimensions (Clause 5.3, Table 2)

Notes:

• Dimensions comply with IS 1538 (Parts 4, 5, 6) unless otherwise specified.
• Body ends sealing is optional and must be specified by purchaser (Clause 10.3).

flowchart TD
    A[Purchaser Order] --> B[Specify Valve Size & Class]
    B --> C[Specify Purpose/Material]
    C --> D[By

IS 5312 (Part 2) - Marking Specifications (Clause 12.1.1)

• Marking Requirement:
  Each valve may be marked with the Standard Mark of BIS, indicating compliance with IS 5312 Part 2 under BIS supervision.

• Standard Mark Significance:

  • Assures product quality via inspection, testing, and quality control.
  • Continuous conformity checks by BIS.
  • Use governed by Bureau of Indian Standards Act 1986.

• Additional Marking Details:
  No explicit formula or dimensional table is provided for marking in the code. Marking typically includes:

  • Manufacturer's name or trademark
  • Size and pressure rating
  • Standard number (IS 5312 Part 2)
  • Standard Mark (if licensed)

Related Dimensional Table for Valves (Clause 5.3 - Table 2)

Summary

• Marking is optional but recommended for