The RegO® Flomatic Internal Valve is
typically used on LP-Gas delivery trucks and transport trucks. It is regarded as a
dependable valve because of its unique operating principle. Unlike any other internal
valve, the Flomatic uses pump differential pressure to open the valve during the pumping
process. The loss of pump differential pressure causes the valve to close, quickly closing
off the flow of product. The valve operation is fully automatic and extremely easy for
delivery personnel to operate: When the pump is on, the main seat disc is open, when the
pump is off the main seat disc is closed. A built-in indicator allows the operator to
easily determine if the seat disc valve is open or closed by simply looking at the valve
(see figure 2 at the bottom of the page).
The Importance of
the Three Way Valve as a Remote Shut-Off Feature
During a transfer
operation, the Three Way Valve handle is in the straight up position allowing liquid from
the pump to pass straight through and continue into the Flomatic piston area, (see figure
3 at the bottom of the page) maintaining the valve in the open position during product
transfer. If at any time during the transfer operation the Three Way Valve handle were
moved to the closed position, liquid flow would be diverted from the pump outlet to the
pump inlet. That action would result in a rapid valve closure.
When the transfer
operation has ended and the pump is shut down, there is no need to close the Three Way
Valve. Since differential pressure has stopped, the Flomatic will close on its own, and
remain closed until the pump is turned on again.
Loss of Pressure
Due to Pump/Piping Shear
If there is a catastrophic
shearing of the pump, pump outlet piping, or delivery hose at a time when the pump is not
in operation (i.e.; between deliveries), the Flomatic would remain closed and retain the
product in the container.
If there is a catastrophic
shearing of the pump or pump outlet piping (up to the inlet of the liquid meter) during a
product pumping operation, the Flomatic will close if the sensing line has been relocated
to the meter inlet. Recent testing has demonstrated that relocating the Flomatic sensing
line from the pump outlet to the meter inlet does not slow the opening action of the
Flomatic and will protect the system from a piping failure up to the point of relocation.
There is a high degree of safety gained by incorporating this installation procedure into
trucks. It does not, however, provide protection from other system failures, such as
piping rupture or hose failure downstream of the meter.
Figure
1. Typical Installation
|
