CW - Mechanical Backflow Prevention Arrangements PP10

What is the fluid category protection rating for a "Non-verifiable disconnector with difference between pressure zones not greater than 10%" against back-pressure?

• 4

• 3

• 2

• X

Which type of heating system is mentioned in the context of using a type CA backflow preventer?

• Open central heating system

• Sealed central heating system

• Electric heating system

• Gas heating system

What type of system is shown in the diagram?

• Electrical system

• Gas system

• Central heating system

• Air conditioning system

On which devices must DB pipe interrupters not be used?

• Hose union bib taps

• Water heaters

• Devices with a control valve restriction

• Garden hoses

How must DB pipe interrupters be fitted?

• Horizontally

• Vertically

• At an angle

• Upside down

What must not be installed downstream of DB pipe interrupters?

• Control valves

• Hose union bib taps

• Water heaters

• Valves

To which standard does the EA single check valve conform?

• BS6282 Part 2

• BS6282 Part 1

• BS6283 Part 1

• BS6283 Part 2

What type of spring is used in the EA single check valve?

• Plastic spring

• Rubber spring

• Stainless steel spring

• Copper spring

What is the fluid category protection provided by the EA single check valve?

• Category 1

• Category 2

• Category 3

• Category 4

What is the primary use of the EC double check valve in domestic installations?

• To regulate water temperature

• To control water pressure

• To prevent backflow in garden hose union bib taps and sealed heating systems

• To filter water impurities