Taylor-Wharton EF-1000 - Manual (Page 12)

BT-472 Rev. B
12
Economizer Circuit
The economizer circuit reduces product loss due to normal evaporation of the liquid within the vessel. The economizer
regulator (PCV-2) opens when the pressure within the vessel exceeds the economizer setpoint. The economizer setpoint
varies depending on the model. This allows gas from the top of the vessel to flow into the vaporizer circuit. Provided
that gas from the vaporizer is being withdrawn for use, the vessel pressure will be reduced. The primary safety valve
(SV-1) will be prevented from opening, avoiding product loss.
Figure 6: Economizer circuit highlighted in blue.
Safety Devices
The Express Fill system features a safety valve to prevent over pressurization of the vessel. The safety valve (SV-1)
relieves pressure when it exceeds the maximum operating pressure of the vessel. The valve reseats when pressure drops
below this point. In addition, the primary safety valve is supported by a secondary relief device consisting of a rupture
disc (R-1). The rupture disc requires replacement in the event a safety valve malfunctions and allows vessel pressure to
reach the burst pressure rating of the disc. A diverter valve and dual relief valves along with rupture discs may also be
ordered as an option.
Figure 7: Safety circuit highlighted in blue.
SV-1
PCV-2
R-1
V-6