Valves And Taps

Question 0

What should valves and taps be made from?

Answer 0

They should be made from brass, or other corrosion resisting alloys

Question 1

Define a valve or a tap?

Answer 1

Valves and taps are devices designed to regulate, open or close the flow of a liquid or gas in a pipeline

Question 2

What is a stop valve used for?

Answer 2

Stop valves are used to shut off the flow of a fluid on high pressure water mains

Question 3

What is a gate valve used for?

Answer 3

Gate valves are used to control the flow of fluids in low pressure systems

Question 4

Explain what a piller tap is?

Answer 4

Pillar taps are made with long threads which allow them too be fitted through sanitary appliances

Question 5

Where would a bib tap be used?

Answer 5

They are used for outside use and cleaners sinks

Question 6

We’re should drain valves be fitted?

Answer 6

They are fitted at low points in plumbing and central heating systems

Question 7

Why have stop valves an arrow printed on them?

Answer 7

To indicate the direction of the water flow

Question 8

Where would you find a gate valve fitted??

Answer 8

You would find a gate valve fitted on pipework from storage cisterns or central heating systems

Question 9

What is an air gap and were would you find one?

Answer 9

An air gap is a gap to prevent back siphonage and you would find one on pillar taps

Question 10

Explain the term cracking a tap?

Answer 10

When the head is loosened and immediately tightened

Question 11

Explain the purpose of a reseating tool?

Answer 11

It is to re grind the seating in a basin or bath tap if a piece of stone was to damage it’s seating

Question 12

We’re are plug valves used?

Answer 12

Plug valves are used on gas lines or sometimes as drain points on water systems

Question 13

Name the two valves either side of the radiator?

Answer 13

The lock shield valve and the wheelhead valve and thermostatic valves

Question 14

List two purposes of a lockshield radiator valve?

Answer 14

when balancing a system it ensures a equal distribution of hot water
To shut off to the flow to the radiator

Question 15

List 2 purposes of a wheelhead radiator valve?

Answer 15

It is used too turn the heater on and off.

Question 16

Lost two valves suitable for use on low pressure water systems?

Answer 16

Gate valves and lever valves

Question 17

List one advantage and one disadvantage of a gate valve?

Answer 17

they are used to control the flow of fluids in low pressure systems
there is no washers and therefore there is no restriction to the flow of liquids through them

Question 18

List one advantage and one disadvantage of a stop valve?

Answer 18

they are designed with a rubber tap washer which gives a positive shut off under high pressure
they are slow closing which allows the water flow too slow down when shutting preventing water hammer

Question 19

List one advantage and one disadvantage of a lever valve?

Answer 19

it is favoured on gas lines

can be used as an alternative to a gate valve on low pressure water systems

Question 20

List two places that a gate valve is used?

Answer 20

Storage cisterns and central heating systems

Question 21

List two places that a stop valve is used?

Answer 21

High pressure water mains and were water hammer could occur

Question 22

List two places that a pillar tap is used?

Answer 22

On a wash basin and in a kitchen sink

Question 23

List two places that a bib tap is used?

Answer 23

Outdoors and a cleaners sink