As Per IS 13095: 2020, Butterfly Valves for General Purposes are classified based on the following factors.

(A) Service Application: Tight shut-off, Regulating, Low Leakage, and Vacuum condition

(b) Nominal Sizes

(c) Nominal Pressure: PN 0.25, PN 0.6, PN 1.0, PN 1.6, PN 2.5 and PN 4.0

(d) Class Designation: Class 125/Class150/Class 300

(e) End Connections: Double Flanged Valves, Wafer Valves

Valves must be identified by their nominal pressure (PN). Each valve must conform to nominal size, nominal pressure, and class designation. The dimensions of the flanged body end and drillings should adhere to the specified standards. Additionally, the body ends must be compatible with pipe flanges meeting the criteria outlined in the standard.

All valves should function effectively under the specified pressure difference across the valve disc. Any appropriate operator, such as a lever or worm gear traveling nut, may be utilized. Additionally, manufacturers are required to conduct hydrostatic testing on all valves.

TESTS

The subsequent test must be conducted for Butterfly valves.

• Dimensional test

• Hydrostatics test

• Performance test

• Body test

• Seat test

• Disc strength test

Ensure that tests are conducted in a well-maintained laboratory, following the methods outlined in the standard.

IS 13095: 2020 outlines requirements for labeling and marking. The Standard Mark (ISI Mark) should be affixed to all compliant productions covered by the license. Manufacturers are required to obtain a BIS license from the Bureau of Indian Standards to use the ISI Mark. The BIS grants this license following a successful evaluation of manufacturing infrastructure, quality control and testing capabilities, and production processes.

You can also explore information regarding BIS Certification for the following products.

PROCESS FOR BIS ISI MARK CERTIFICATION