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Module 2: Domestic Hot and Cold Water Services Unit 9 – Valves and Taps Duration – 11 Hours

Module 2: Domestic Hot and Cold Water Services Unit 9 – Valves and Taps Duration – 11 Hours. In this module we learn how to: Describe the types and application of valves and taps used in domestic plumbing systems. Describe the operation and components of valves and taps.

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Module 2: Domestic Hot and Cold Water Services Unit 9 – Valves and Taps Duration – 11 Hours

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  1. Module 2: • Domestic Hot and Cold Water Services • Unit 9 – Valves and Taps • Duration – 11 Hours

  2. In this module we learn how to: • Describe the types and application of valves and taps used in domestic plumbing systems. • Describe the operation and components of valves and taps. • Replace stopcock, tap and ballvalve washers.

  3. Key Learning Points • RK Types and application of taps - pillar taps, mixer taps, monobloc taps, bib taps, etc. • RK Types and application of valves - stopcocks, gate valves, lever valves, drain cocks, etc. • RK Operation and components of taps and valves. • RK Types, components and operation of float assisted valves – high pressure, low pressure, diaphragm, portsmouth (BS), equilibrium. • RK Ball valve problems – water hammer, leaking, sticking, furring, cavitation. • SK Replacement of tap and valve washers. • SK Identification of different types of washers, o rings etc. • SK Use of tap re-seating tools. • P Good working practice. • P Problem solving. • P Working independently.

  4. Valves and Taps • Valves and taps are devices designed to regulate, open or close the flow of • liquid or gas in a pipeline. • Some of the more common valves and taps and their uses are as follows: • Stopcock - Used on incoming high pressure water mains. • Gate valve - Used on low pressure pipework. • Drain off cock - Used to drain pipework. • Bib tap - A well mounted tap primarily used over sinks. • Pillar tap - Used on sinks, wash hand basins and baths. • Mixer taps - A tap which hot and cold water are delivered through a common spout. Used in sinks. • Plug cock - A quick closing valve used mainly on gas installations. • Radiator valves - Used to control the flow of water to and from radiators.

  5. Repacking Glands on Radiator Valves

  6. Back Siphonage • The backflow of water by siphonic action from an appliance or storage cistern • into the pipe feeding it, thus contaminating the water supply. • Any pipe on mains supply connected to appliances and cisterns must have • some means of backflow prevention. Where an outlet discharges, ensure an • allowance is made for an air gap of at least that shown in the chart. • If a specified air gap cannot be achieved some other means of backflow • prevention must be catered for. In the case of hose pipes and shower • hoses connected to the mains supply a double check valve assembly or • similar arrangement such as a check valve followed by an anti-vacuum • valve must be used.

  7. Draw Off Taps

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