Resilient Seated Cast Iron Air Relief Valves for Water Works Purposes

IS 14845 - Scope: Key Specifications & Tables

1. Scope Overview

• Covers design, materials, and manufacture of air valves (single, double, kinetic).
• Ensures valve components meet pressure, size, and material standards.
• Applies to valves for water supply and sewage systems.

2. Key Tables

3. Body Thickness (mm) - Clause 10.2.4

4. Material Specifications (Clause 9.1)

IS 14845 references several Indian Standards (IS) in Annex B which form integral provisions of this code. Key points:

• Referenced Standards: These include codes related to materials, testing, design, and workmanship. The exact list is in Annex B of IS 14845.
• Edition Validity: The editions mentioned were valid at publication; users should check for the latest versions.
• Rounding Off: Final test or calculation values must be rounded per IS 2:1960 ("Rules for rounding off numerical values").
  • Retain the same number of significant figures as specified values.
• Compliance: Use the referenced IS codes for detailed specifications on materials, testing procedures, and design criteria.

Commonly Referenced IS Codes (Examples)

Summary Diagram: Reference Flow in IS 14845

graph LR
A[IS 14845] --> B[Annex B: Referenced IS Codes]
B --> C[Material Specs (e.g., IS 383)]
B --> D[Design Codes (e.g., IS 456)]
B --> E[Testing Procedures (e.g., IS 516)]
B --> F[Numerical Rules (IS 2)]

Tip: Always verify the latest edition of referenced IS codes for compliance and accuracy.

IS 14845: Terminology & Key Specifications Summary

• Rounding off values: Follow IS 2:1960 rules; retain significant figures as per specified values.

Key Tables & Dimensions

Table 10.4: High Pressure Orifice Dimensions (Clause 10.4)

• Components: High pressure cover, orifice cover, orifice plug, ball (float), bolts & nuts.
• All dimensions in millimeters.

Table 2: Minimum Body Thickness (Clause 10.2.4)

Notes:

• Purchaser must specify technical details as per Annex A during enquiry/orders.
• Dimensions and thicknesses ensure structural integrity and proper sealing of air valves.

flowchart TD
    A[High Pressure Orifice] --> B[H.P. Cover]
    A --> C[H.P. Orifice Cover]
    A --> D[H.P. Orifice Plug]
    A --> E[H.P. Ball (Float)]
    A --> F[Bolts &

IS 14845: Air Relief Valves – Key Specifications & Tables

Types of Air Relief Valves

• Single Air Valve (Small Orifice): For evacuating accumulated air under pressure.
• Double Air Valve (DS1 & DS2): Combines small and large orifices for air release during filling and draining.
• Kinetic Air Valve (DK): Designed to handle rapid air discharge during transient conditions.

Table 10.4: High Pressure Orifice Dimensions

Table: Body Thickness (Clause 10.2.4)

Application Notes

• Small orifice valves are suitable for mains up to 100 mm diameter.

IS 14845 - Key Material Specifications & Tables

Clause 9.1: Materials for Valve Components (Table 1)

IS 14845: Design and Manufacture - Key Specifications & Tables

1. Material Specifications (Clause 9.1, Table 1)

• Body & Components: Grey Cast Iron (IS 210 FG 200) or alternatives like High Tensile Brass (IS 320 HTB 1/2) and Stainless Steel (IS 6603 grades).
• Seat Rings: Natural Rubber (IS 11855) or EPDM/Nitrile Rubber.
• Orifice & Stem Nut: Leaded Tin Bronze (IS 318 LTB-2), High Tensile Brass, or Stainless Steel.
• Bolts & Nuts: Carbon Steel (IS 1363 Class 4.6/4) or Stainless Steel.
• Gasket: Rubber (IS 638 Type B).
• Gland Packing: Jute/Hemp (IS 5414 Type III).

2. Design Dimensions

3. High Pressure Orifice Dimensions (Clause 10.4)

4. Float Diameter (Clause 10.5.3)

| Valve Size (mm) | Single Air Valve Small Orifice (mm) | Double Air Valve Small Orifice (mm) | Kinetic Air Valve Small Orifice

IS 14845: Dimensions & Tolerances Key Data

1. Minimum Body Thickness (Clause 10.2.4, Table 2)

2. Minimum Float Diameters (Clause 10.5.1, Table 3)

3. Low Pressure Seat Ring Thickness & Orifice Size (Clause 10.6.2, Table 4)

IS 14845 - End Connections Key Specifications

1. Dimensional Tables for End Connections

For larger valves (from Clause 1.0):

2. Body Thickness (Clause 10.2.4)

3. Cap for Isolating Valve (Clause 10.11.1.4)

IS 14845 - Testing and Performance Key Points

1. Function and Performance Test (Clause 12.4)

• The valve must undergo function and performance tests to verify compliance.
• Final test results are rounded per IS 2:1960 rules, maintaining the same significant figures as specified.

2. Body Thickness (Clause 10.2.4) - Table Summary

3. High Pressure Orifice Dimensions (Clause 10.4)

4. Body Test (Clause 12.4.4)

• The valve body must be pressure tested to check for leaks and strength.
• Test pressure and duration are specified in the standard (refer to Clause 12.4.4 for exact values).

Summary Diagram: Testing Flow

flowchart TD
    A[Start: Valve Production] --> B[Function Test]
    B --> C{Pass?}
    C -- Yes --> D[Body Thickness Check]
    D --> E[Body Pressure Test]
    E --> F{Pass?}
    F -- Yes --> G[Valve Certified

IS 14845 – Marking Specifications Summary

• Standard Mark Use (Clause 15.2.1):
  The use of the Standard Mark is strictly governed by the Bureau of Indian Standards Act, 1986. Manufacturers must obtain a license from BIS to use the Standard Mark on products.

• Marking Details:
  Specific marking requirements (such as product identification, manufacturer’s name, license number) are usually detailed in the product-specific annex or purchase documentation (Annex A).

• Rounding Off Results (Clause 16):
  Test results must be rounded off per IS 2:1960, maintaining the same number of significant digits as specified in the standard.

Key Points for Marking:

IS 2:1960 Rounding Rules (Summary)

• If the digit to be dropped is < 5, round down.
• If the digit to be dropped is > 5, round up.
• If the digit to be dropped = 5, round to make the last retained digit even.

If you need detailed marking layout or exact text formats, refer to BIS licensing documentation or Annex A of IS 14845.

Inspection (Clause 13.1, IS 14845)

• Inspection Requirement: Must be clearly stated in enquiry and order.
• Access: Purchaser or authorized representative allowed reasonable access to manufacturer's works to inspect assembled valves.

Key Tables & Specifications for Valves

• Taper: 1 in 20 each side
• Tapped Hole: M10 up to size 150, M12 for size 200

Material Specifications (Clause 9.1, Table 1)

Float Diameter (Clause 10.5.3, Table 3)

IS 14845: Packaging and Storage of Valves

Key Specifications from IS 14845:

• Clause 16.1 (Packing):

  • Valves must be packed to minimize damage during storage and transit.
  • If special packaging is required, the purchaser must specify these needs.

• Clause 16.2 (Storage):

  • Valves shall be stored in roofed stores to protect from weather and environmental damage.

Additional Best Practices (Engineering Knowledge):

• Use shock-absorbent materials (e.g., foam, bubble wrap) inside packaging to prevent mechanical damage.
• For heavy valves, use crates or pallets that allow safe handling and stacking.
• Store valves on racks or pallets to avoid direct contact with the floor, preventing corrosion.
• Maintain dry, ventilated storage to avoid moisture accumulation.

Summary Table:

flowchart LR
    A[Valve Manufacturing] --> B[Packing]
    B --> C{Damage Minimization}
    C -->|Yes| D[Shock-Absorbent Materials]
    C -->|If Required| E[Special Packaging as per Purchaser]
    D --> F[Storage in Roofed Store]
    E --> F
    F --> G[Safe Handling & Transit]

This ensures valve integrity until installation.

IS 14845: Preparation for Dispatch - Key Points

• Storage: Valves must be stored in roofed stores to protect from weather (Clause 16.2).

• Technical Details: Purchaser must supply technical details at enquiry/order stage as per Annex A (Clause 17).

• Packing & Storage:

  • High-pressure orifice chambers must be sealed effectively (Clause 10.4).
  • Components include High Pressure Cover, Orifice Cover, Orifice Plug, Ball (Float), Bolts & Nuts.

• Dimension Tables:

• Body Thickness (mm) by Valve Type and Size:

Summary for Dispatch Preparation:

• Ensure valves are stored under cover.
• Verify all technical details from purchaser are complete.
• Check packing integrity especially sealing of high-pressure orifices.
• Confirm dimensions and thicknesses per tables before dispatch.

flowchart TD
    A[Order Received] --> B[Check Technical Details (Annex A)]
    B --> C[Valve Inspection]
    C --> D{Storage Condition}
    D -->|Roofed Store| E[Packing & Sealing]
    E --> F[Dispatch]
    D -->|Not Roofed|

IS 14845 - Enquiry and Order Information Key Specs & Tables

Enquiry & Order Details (Annex A)

• Purchaser must specify if inspection is required (Clause 13.1).
• Manufacturer access for inspection during assembly must be granted.

Table Highlights:

1. Cap for Isolating Valve (Clause 10.11.1.4)

• Taper: 1 in 20 each side.
• Tapped holes: M10 (up to size 150), M12 (size 200).

2. High Pressure Orifice (Clause 10.4)

3. Body Thickness (Clause 10.2.4)

4. **Low Pressure Seat

IS 14845 Annexes Summary: Key Tables & Specifications

Annex A: Purchaser's Technical Details

• Details to be provided by purchaser during enquiry/order.

Annex B: Referenced Indian Standards

• Contains relevant IS standards; check for latest editions.

Annex C: Technical Committee Composition

• Lists members responsible for the standard.

Clause 10.4: High Pressure Orifice Design

• Orifice must be effectively sealed.
• Components:
  • High Pressure Cover
  • H.P. Orifice Cover
  • H.P. Orifice Plug
  • H.P. Ball (Float)
  • Bolts & Nuts

Table 10.4: High Pressure Orifice Dimensions (mm)

Table 2: Body Thickness (Clause 10.2.4) (mm)