What is the definition of a 'Gate Valve' according to this standard?

A valve in which the closing member is a flat or tapered gate, sliding at right angles to the direction of flow to shut off the fluid. It is primarily for on/off service.

What is the difference between a valve and a cock?

A cock is a specific type of valve where the closing member (plug) rotates about an axis at a right angle to the flow direction. All cocks are valves, but not all valves are cocks.

What does 'DN' (as in DN 100) signify for a valve?

DN stands for 'Diamètre Nominal' (Nominal Diameter), which is a dimensionless designator used as a reference for the size of pipes, flanges, and valves.

What is a 'Non-Return Valve'?

It is a valve that allows fluid to flow in one direction only and automatically prevents backflow. It is also commonly known as a check valve.

IS 8931

: 1989

Glossary of Terms for Valves and Fittings

CurrentFrequently UsedTerminologyBIMMEP · Plumbing Fixtures and Valves

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This standard provides a comprehensive glossary of terms related to valves and their fittings. It aims to standardize the nomenclature for different types of valves, their components, operational characteristics, and associated fittings to ensure uniform understanding and communication in the industry.

Provides definitions of terms relating to valves and fittings used in various applications.

Practical Notes

Essential for writing clear technical specifications and procurement documents for valves and fittings.

Helps in correctly identifying valve types (e.g., gate vs. globe) and their specific parts during maintenance and inspection.

Use this standard to avoid ambiguity when discussing valve performance characteristics like 'shut-off', 'throttling', and 'non-return'.