Swing Check Type Reflux (Non-Return] Valves for Water Works Purposes, Part 1: Single-Door Pattern

IS 5312 Part 1 — Scope & Key Specifications

Scope (Clause 1.2):

• Covers reflux valves (sizes 50 to 600 mm).
• Excludes: Double disc check and lift check valves.

Key Specifications

Important Tables Summary

Table 2: Dimensions of Reflux Valves (mm)

Tolerance on Length:

• 0–250 mm: ±2 mm
• 251–500 mm: ±3 mm
• 501–800 mm: ±4 mm
• 801–1000 mm: ±5 mm
• 1001–1300 mm: ±6 mm

Table 3: Flange Dimensions (mm) for Sizes 50 & 65

Table 4: By-Pass Arrangement Sizes (mm)

IS 5312 (Part 1): 2004 — Key Referenced Indian Standards & Specifications

Referenced Indian Standards (Annex A)

Key Dimensions & Tolerances (Clause 6.2 & Tables)

Table 2: Dimensions of Reflux Valves (mm)

Length Tolerance (mm)

IS 5312 Part 1: Nominal Pressures for Reflux Valves

1. Nominal Pressure (PN) Definition

• PN = Maximum permissible gauge working pressure (MPa).
• For valve sizes 50 mm to 600 mm, nominal pressures are:
  • 1.0 MPa
  • 1.6 MPa

2. Hydrostatic Test Pressures & Durations (Clause 8.2, Table 5)

3. Valve Dimensions & Tolerances (Clause 6.2, Table 2)

Length Tolerances:

4. Key Specifications to Provide with Order (Clause 10)

• Valve size
• Max cold non-shock working pressure
• Material details (body, door, cover)
• Operating position (horizontal/vertical/inclined)
• By-pass arrangement requirement
• Flow velocity or volumetric flow rate
• Corrosive water details (if any)
• Flange details (if non-standard)

This concise summary covers nominal pressures, testing, dimensions, and ordering info per IS 5312 Part 1. For detailed design, refer to

IS 5312 Part 1: Nominal Sizes Key Points

1. Nominal Size Definition (Clause 4.1.1)

• Nominal size = nominal bore of the waterway.
• Actual bore ≥ nominal size.

2. Materials (Table 1)

• Materials for components must comply with Table 1.
• Alternative materials allowed as per contract.

3. Valve Dimensions (Table 2, Clause 6.2)

• Length tolerance depends on range (±2 to ±6 mm).

4. Flange Dimensions (Table 3, Clause 6.9)

Key Materials & Specifications from IS 5312 Part 1:2004

1. Material Specifications (Table 1, Clause 5)

IS 5312 Part 1: Key Design & Construction Specifications

1. Dimensions of Reflux Valves (Clause 6.2, Table 2)

Length tolerance (mm):

2. Flange Dimensions & Drilling (Clause 6.9, Table 3)

3. By-Pass Arrangement Sizes (Clause 6.13, Table 4)

IS 5312 Part 1 – Coating & Painting (Clauses 7.1 & 7.2)

Key Specifications:

• Surface Preparation (7.1):

  • All unmachined ferrous surfaces (inside & outside) must be clean, dry, rust and grease free before painting.
  • Exposed machined ferrous surfaces: Apply one coat of aluminium red oxide primer.

• Painting (7.2):

  • Apply two coats of black Japan (Type B of IS 341) or paint conforming to IS 9862 or IS 2932.
  • Application method: brush or spray.
  • For exterior: paint in purchaser-approved colour.
  • Note: Valves may be assembled without coating if inspection is required.

Summary Table for Painting

Additional Notes:

• Painting is done after valve testing and before dispatch.
• Proper surface prep ensures adhesion and corrosion resistance.

flowchart TD
    A[Valve Testing Completed] --> B[Surface Cleaning]
    B --> C[Apply 1 Coat Aluminium Red Oxide Primer]
    C --> D[Apply 2 Coats Black Japan / Approved Paint]
    D --> E[Drying & Inspection]
    E --> F[Dispatch]

This ensures durability and corrosion protection per IS 5312 Part 1.

IS 5312 Part 1 — Testing: Key Specifications & Tables

1. Rounding Off (Clause 2)

• Final test values rounded per IS 2:1960.
• Retain significant figures same as specified values.

2. Hydrostatic Test (Clause 8.2, Table 5)

• Valves must show no leakage or permanent distortion.
• Pressure applied at inlet with ends blanked.

3. Inspection

• Purchaser or authorized representative may inspect at any manufacturing stage.

4. Information to Supply with Order (Clause 10)

• Valve size, max cold working pressure.
• Body, door, cover material.
• Operating position (horizontal/vertical/inclined).
• By-pass arrangement requirement.
• Flow velocity or volumetric flow.
• Corrosive water details.
• Flange details if non-standard.

5. Dimensional Tables

• Valve Length & Hinge Pin Diameter (Table 2):
  Length (L) varies from 203 mm (Size 50) to 1295 mm (Size 600).
  Hinge pin diameter min ranges 10 mm to 38 mm.

• Flange Dimensions (Table 3):
  Example for Size 50:

  • Outside diameter (D): 165 mm
  • Thickness: 16 mm
  • Bolt circle diameter (C): 125 mm
  • Number of holes: 4
  • Bolt hole diameter: 19 mm
  • Bolt diameter: 16 mm

• By-Pass Size (Table 4):
  Min size ranges from 10 mm (Size 50-100) to 65 mm (Size 600).

flowchart TD
    A[Valve Testing] --> B[Hydrostatic Body Test]

IS 5312 (Part 1) - Inspection: Key Specifications & Tables

Inspection Clause:

• Purchaser or authorized representative has free access to inspect valves at any manufacturing stage and reject non-conforming materials.

Key Tables for Inspection & Dimensions

Materials for Inspection (Table 1, Clause 5)

• Body, Cover, Door: Grey cast iron (IS 210 FG 200) or spheroidal/nodular cast iron (IS 210 FG 260).
• Hinge Pin: Stainless steel (IS 6603 12Cr12) or high tensile brass.
• Seat Rings: Leaded tin bronze (IS 318 LTB 2) or stainless steel (IS 3444 Gr 1/4/10).
• Bolts & Nuts: Carbon steel bolts (IS 1363 Part 1 Class 4.6), nuts (IS 1363 Part 3 Class 4.0).

Inspection Checklist Summary

• Verify **

IS 5312 Part 1: Information to be Supplied with Enquiry or Order (Clause 10)

The purchaser must provide the following details when placing an enquiry or order:

• Size of valve (Nominal bore)
• Maximum cold non-shock working pressure (in MPa)
• Material of body, door, and cover (refer Table 1 for preferred/alternate materials)
• Operating position of valve: horizontal, vertical, or inclined
• By-pass arrangement: whether required or not
• Flow velocity or volumetric flow rate
• Water corrosiveness: specify if water is corrosive, with details
• Flange details: if different from IS standard

Key Tables & Specifications

Materials for Components (Table 1)

Dimensional Highlights (Table 2 & 3)

• Valve Length (L): e.g., Size 50 = 203 mm, Size 600 = 1295 mm
• **Hinge Pin Diameter

IS 5312 Part 1 (2004) - Marking Key Points

• Clause 11.2.1: Use of the Standard Mark (BIS Certification Mark) is strictly governed by the Bureau of Indian Standards Act, 1986, and associated rules.
• License for Marking: Manufacturers must obtain a license from BIS to use the Standard Mark on valves.
• Clause 11.2: Each valve may be marked with the Standard Mark to indicate conformity.

Important Notes:

• The code does not provide specific formulas or tables for marking.
• Marking typically includes:
  • Manufacturer’s name or trademark
  • BIS Standard Mark (once licensed)
  • Size, pressure rating, and material grade (as per manufacturer’s practice)
• For detailed marking conditions and license procedures, refer to the BIS Act and Rules or contact BIS directly.

Summary Table: Marking Requirements

flowchart LR
    A[Manufacturer] --> B[Apply for BIS License]
    B --> C[Approval Granted]
    C --> D[Use Standard Mark on Valve]
    D --> E[Valve Sold with Certification]

For precise marking specifications, always consult the latest BIS guidelines.

IS 5312 (Part 1) - Packing and Storage Key Points

• Clause 12.3: Valves must be stored in a roofed store, protected from dirt and moisture to prevent damage and corrosion.

• Storage Environment:

  • Dry, clean, and sheltered.
  • Avoid direct exposure to weather elements.

• Packing:

  • Use suitable packing materials to protect valves during transportation and storage.
  • Packing should prevent ingress of dust, dirt, and moisture.

• Reference Standards: For packing materials and jointing, refer to related IS codes like:

  • IS 2712: Gaskets and packings – Compressed asbestos fibre jointing.
  • IS 638: Sheet rubber jointing.
  • IS 778: Copper alloy valves.

Summary Table for Storage Conditions

flowchart LR
    A[Valve Manufacture] --> B[Packing with protective materials]
    B --> C[Transport]
    C --> D[Storage in roofed, dry store]
    D --> E[Inspection before installation]

For detailed packing methods, consult the relevant IS codes referenced in Annex A of IS 5312 (Part 1).

IS 5312 Part 1: List of Referenced Indian Standards (Annex A)

This part of IS 5312 references key Indian Standards related to materials and components for valves and fittings used in water works:

Key Specification Notes:

• Valve Storage: Clause 12.3 requires valves to be stored in a roofed store, away from dirt.
• Amendment: Clause 6.13.2 updated to include valve size 65 mm along with 50 mm.

Usage Tip:

When designing or selecting valves and fittings per IS 5312 Part 1, refer to these standards for material specs, mechanical properties, and dimensions to ensure compliance and durability.

flowchart LR
    A[IS 5312 Part 1] --> B[Materials Standards]
    B --> C[Grey Iron Castings (IS 210)]