Trade of Plumbing Phase 2 Module 2 Unit
Trade of Plumbing – Phase 2 Module 2 – Unit 9 Module 2: Domestic Hot and Cold Water Services Unit 9 – Valves and Taps Duration – 11 Hours
Trade of Plumbing – Phase 2 Module 2 – Unit 9 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.
Trade of Plumbing – Phase 2 Module 2 – Unit 9 Key Learning Points _RK _RK _RK _SK _SK _P _P _P Types and application of taps - pillar taps, mixer taps, monobloc taps, bib taps, etc. Types and application of valves - stopcocks, gate valves, lever valves, drain cocks, etc. Operation and components of taps and valves. Types, components and operation of float assisted valves – high pressure, low pressure, diaphragm, portsmouth (BS), equilibrium. Ball valve problems – water hammer, leaking, sticking, furring, cavitation. Replacement of tap and valve washers. Identification of different types of washers, o rings etc. Use of tap re-seating tools. Good working practice. Problem solving. Working independently.
Trade of Plumbing – Phase 2 Module 2 – Unit 9 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.
Trade of Plumbing – Phase 2 Module 2 – Unit 9
Trade of Plumbing – Phase 2 Module 2 – Unit 9
Trade of Plumbing – Phase 2 Module 2 – Unit 9
Trade of Plumbing – Phase 2 Module 2 – Unit 9
Trade of Plumbing – Phase 2 Module 2 – Unit 9
Trade of Plumbing – Phase 2 Module 2 – Unit 9
Trade of Plumbing – Phase 2 Module 2 – Unit 9
Trade of Plumbing – Phase 2 Module 2 – Unit 9 Repacking Glands on Radiator Valves
Trade of Plumbing – Phase 2 Module 2 – Unit 9 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. Internal Pipe Diameter Vertical distance (air gap) between outlet and highest possible water level Up to 14 mm 15 mm – 21 mm 22 mm – 41 mm Over 41 mm 20 mm 25 mm 70 mm Twice the internal bore of the inlet pipe 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.
Trade of Plumbing – Phase 2 Module 2 – Unit 9 Draw Off Taps
- Slides: 14