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Last edited 02 Aug 2023
- A tap that when turned opens a valve to release pressurised water.
- A toilet that when flushed opens two valves – one that allows water to escape, and another that refills the toilet with more water.
- A gas cooker hob that opens a valve to allow more gas to increase the flame size.
An automated or manual mechanism is used to open and close valves. For high-pressure flow pipework, opening and closing manually can be physically difficult, often requiring a long lever or large wheel. Big valves can be operated using hydraulic rams.
There are several different types of valves, including:
- Ball valve: A hollowed-out ball sits inside a pipe obstructing the flow and swivelling through 90-degrees when turned.
- Butterfly valve: A disc sits inside a pipe and swivels sideways or upright.
- Cock or plug: A cone-shaped plug moves to one side when a wheel or handle is turned.
- Gate or sluice: Metal gates are lowered across pipes, usually only capable of being fully open or fully closed.
- Globe: When turned a valve is screwed in, such as with a tap.
- Needle: A long, sliding needle regulates fluid flow, such as in central heating systems.
- Spool: Valves slide backwards and forwards to direct fluid flow around a pipe circuit, such as in hydraulic systems.
- A guide to installing thermostatic mixing valves: what, why and how.
- BSRIA announces 2021 European HVAC field device study.
- BSRIA publishes new edition of BG29.
- BSRIA study: The market for European Field Devices.
- Closed Systems Control Association.
- Control valve.
- Differential pressure control valve.
- Float valve.
- Mechanical, electrical and plumbing MEP.
- Pipework defects, ventilation and airflow rates.
- Pressure independent control valves.
- Pressure-relief valve.
- Stop valve.
- Thermostatic mixing valve.
- Types of valve.
- Water hammer.
- What makes a good PICV?
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