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This module covers types, operation, repair, and replacement of domestic plumbing valves and taps. Learn about different valve and tap types, components, and common issues like ball valve problems and washer replacement. Enhance your skills in valve and tap maintenance, problem-solving, and good working practices.
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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. • Replace stopcock, tap and ballvalve washers.
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.
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.
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.
