What are the two pressure classes for these valves?

Class 1 for a maximum working pressure of 1.0 MPa, and Class 2 for a maximum working pressure of 1.6 MPa (Clause 2.1).

What is the standard hydrostatic test pressure for a Class 1 valve body?

The body must be tested to 2.1 MPa (21 kgf/cm²) as per Table 3.

What material is specified for the valve body?

Grey cast iron conforming to at least Grade FG 200 of IS 210 (Clause 4.1).

What are the facing requirements for flanges?

Flanges are to be machined flat on the face and drilled as per IS 1538, unless specified otherwise (Clause 5.3).

IS 9338

: 1984

cast iron screw-down stop valves and stop and check valves for water works purposes

CurrentSpecializedSpecificationWater Resources · Sanitary Appliances and Water Fittings

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This standard specifies the requirements for materials, dimensions, construction, and testing of cast iron screw-down stop valves and stop and check valves. These valves, in nominal sizes from 40 to 300 mm and two pressure classes, are intended for use in water works pipelines.

cast iron screw-down stop valves and stop and check valves for water works purposes

Quick Reference Values

Nominal size range40 mm to 300 mm

Class 1 Max Working Pressure1.0 MPa

Class 2 Max Working Pressure1.6 MPa

Class 1 Body Hydrostatic Test Pressure2.1 MPa

Class 1 Seat Hydrostatic Test Pressure1.4 MPa

Class 2 Body Hydrostatic Test Pressure3.0 MPa

Class 2 Seat Hydrostatic Test Pressure2.0 MPa

Minimum Cast Iron Grade for BodyFG 200 of IS 210

Practical Notes

Ensure compatibility of flange drillings with connecting pipes, which typically follow IS 1538.

Valves must be installed according to the flow direction arrow cast on the body.

Verify the correct pressure class (Class 1 or Class 2) is selected based on the pipeline's maximum working pressure.