Alarm Valves And Dry Pipe Valves 2 Flashcards
What is installed on the air line after the AMD and before the body of the DPV?
Double check valve with control valve
What is installed before and after an accelerator?
Before:
-control valve
-anti flooding device
-optional strainer
-union
After:
-union
-control valve
In order, what is installed on the excess pressure pump feed and discharge line?
Feed:
-control valve
-strainer
Discharge:
-relief valve
-check valve
-automatic pressure switch
-control valve
Where on the alarm line does the strainer get installed?
As close to the body as possible.
When can the 750 gal max be exceed on a dry pipe system?
If the hydraulically designed so that water is delivered to the system test connection in not more than 60 seconds, starting with normal air pressure.
When can the 60 second rule be omitted?
When the system over 500gal is equipped with a QOD or can meet the time without one.
How much excess pressure does the EPP usually provide?
30 - 50psi above supply pressure
What is required in a valve room?
Light and heat from a permanently installed source.
What are 3 characteristics of pilot port seat?
-separate clapper than the valve seat
-greater opening to alarm line
-separate port from ring seat to the alarm line
What type of alarm device can an alarm valve operate that a paddle flow can not?
WMG
Identify the possible alarm apparatus for a wet pipe system.
A listed alarm check valve
Or
Alarm device with necessary attachments required to give an alarm
What is the min size piping installed between sprinkler system and alarm pressure switch?
3/8”
State min size piping serving a WMG.
3/4”
State where the alarm bypass test connection shall be made on any system valve.
City pressure side
When is a local water flow alarm required on sprinkler system?
When the system has more than 20 heads.
