Cold water PT 8

Open Ended

How do water regulations and the risk of backflow influence the choice of components in cold water plumbing systems?

Multiple Select

Which of the following statements about isolation valves are correct?

• Servicing valves can be fitted before a float-operated valve on certain appliances.

• Drain valves are installed at every low point in a system.

• Stop valves are used for low pressure only.

• Servicing valves must always be high pressure.

Multiple Choice

Which type of valve is commonly used on incoming mains for high pressure only?

• Stop valve

• Servicing valve

• Drain valve

• Full-way gate valve

Multiple Choice

What is the main function of a lever arm spherical plug valve?

• To isolate appliances and terminal fittings

• To drain water from the system

• To control water pressure in mains

• To operate as a float valve

Fill in the Blank

A Surestop is a modern electronic form of mains isolation using a ___ .

Open Ended

Explain the difference between a screw-down valve for high pressure and a full-way gate valve for low pressure, based on their construction and application.

Multiple Choice

Which part of the float-operated valve is responsible for adjusting the water level?

• Bent arm

• Diaphragm washer

• Body union

• Outlet

Open Ended

Explain how the diaphragm-operated float valve helps prevent water hammer or murmur.

Fill in the Blank

Ball murmur is a type of ___ caused by the float-operated valve opening and closing quickly.

Multiple Select

Which of the following are common causes of water hammer in a high-pressure water pipe?

• Loose jumper in a stopcock

• Pipes not fixed correctly

• Partially blocked float-operated valve

• Excessive water temperature

Multiple Choice

Which component is required to attach a bib tap to a wall?

• Backplate elbow

• Hose union tap

• Pillar tap

• Diaphragm washer

Multiple Choice

Which of the following statements best describes the main difference between a bi-flow mixer tap and a true mixer tap?

• A bi-flow mixer tap mixes hot and cold water inside the tap body before it exits.

• A true mixer tap has two separate spouts for hot and cold water.

• A bi-flow mixer tap has a single spout divided down the middle so water does not mix until it has left the tap.

• A true mixer tap is only used on baths, basins, and bidets.

Multiple Select

Which of the following are basic types of taps?

• Rising spindle tap

• Non-rising spindle tap

• Quarter-turn tap (ceramic disc)

• Ball valve tap

Fill in the Blank

The tap washer in a rising spindle tap is attached to a ___

Fill in the Blank

This tap relies on two ___ disc plates turning against each other.

Open Ended

Explain the differences between manual mixing valves and pressure-compensating mixing valves in terms of their operation and suitability for plumbing installations.

Multiple Choice

Scaling in water systems is primarily caused by the presence of which mineral?

• Sodium chloride

• Calcium carbonate

• Magnesium sulfate

• Potassium nitrate

Multiple Select

Select all the methods used to treat water according to the slides.

• Water softeners

• Water conditioners

• Water filters

• Reverse osmosis

Fill in the Blank

Water softeners use a process called ___ to remove dissolved calcium and magnesium salts.

Open Ended

Describe the maintenance requirements for a water softener and explain why it is important to leave at least one unsoftened cold water outlet in a dwelling.

Open Ended

Reflecting on today's lesson about cold water system components and regulations, what questions do you still have or what would you like to learn more about regarding the installation of cold water systems?

Multiple Choice

Why is it important for plumbers in the UK to use approved materials, fittings, and appliances when installing cold water systems?

• To comply with water regulations and prevent issues like backflow, contamination, and corrosion

• To reduce installation costs

• To speed up the installation process

• To avoid using imported products