CH. 10 1.2 PRESSURE CONTROL DEVICES

Question 0

Discharge relief valve

Answer 0

Sense pressure at the discharge manifold
Pressure exceeded dumps pressure back into the intake
Requires a differential between intake and discharge

Question 1

Three types of pressure control devices

Answer 1

Discharge control
Intake control
Combination control

Question 2

Discharge relief valve differential

Answer 2

40 PSI or 300 RPM

Question 3

Discharge relief valve operation

Answer 3

A pilot valve mounted on the pump panel controls back pressure on the pressure relief valve on the pump
To set water must be flowing

Question 4

Electronic governor

Answer 4

Control pressure on the discharge side sense pressure and control by raising or lowering RPM
Not pressure control devices when in RPM mode

Question 5

Intake relief valve

Answer 5

Sense pressure on the intake side dump excess to the ground

Required when using LDH (Water hammer)

Question 6

Types of intake relief valves

Answer 6

Internal or external
Req. On externally added valves
Piston, waterous, combo

Question 7

Hale TPM Relief valve system

Answer 7

Combination intake and discharge
Intake valve senses intake pressure but dumps excess off discharge
Discharge pressure set then intake automatically set 30 psi lower

Question 8

Relay operation water supply

Answer 8

Attack and supply engine in pressure mode

Middle engines in RPM mode

Question 9

Intake control

Answer 9

Should be set to 100 psi
Minimum setting 50 psi
External valves should be set to 125 psi
Waterous intake relief valve system 100 psi