Pressure Reducing Valves and Booster Pumps 060301h Flashcards
What senses the pressure in a PRV?
The diaphragm
What valve do you use on a manual bypass around a PRV?
Globe Valve
How many valves are needed when bypassing a PRV?
3
- 2 ball valves
- 1 globe valve
When can you use a ball valve in a bypass around a PRV?
When on a boiler system
Where is a strainer installed on a PRV?
Main high pressure side (upstream)
When a PRV is installed on a domestic water system in a high pressure application what must be installed downstream of the PRV?
Pressure relief
When is a series or two stage application of pressure reducing used?
To allow for greater pressure reduction than that provided by a single valve
What is the maximum amount of storey’s you can service with an up feed booster pump system?
20
Pressure reducing valves are required when the static pressure may exceed ___ kPa
550
What is the most common type of booster pump?
In-line centrifugal
The pressure maintained by the valve when water is flowing
Reduced flow pressure
Two or more valves installed to serve the needs of one large supply main
Parallel PRV Installation
Two or more valves installed inline
Series PRV Installation
On a system using a constantly running pump, during low demand periods when pressure may build up too high, a relief valve opens allowing water to discharge from the high pressure side to where?
Into the pump inlet
