Hale DSD User Manual
Page 16
PRESSURE CONTROL DEVICES
Three basic types of pressure control devices are used with Hale Midship pumps:
Engine speed governor system (optional).
Relief valve system (standard).
Hale Total Pressure Master Relief Valve System (optional). Relief Valve System
As shown in Figure 1-14, the Relief Valve System is a single bronze, variable press= setting relief
valve of sufficient capacity to prevent an undue pressure rise (NFPA Pamphlet No. 1901). The
relief valve is normally closed; it opens against pump pressure. A control light signals when the
valve is open.
Figure 1-14. Relief Valve System