Platon Automatic Flow Controller
DS1521
Features:
Fully automaꢀc ꢁow control
No power required
1/2” - 4” line sizes
10:1 control range
Fast response
Suitable for hazardous liquids or gases
PLATON FLOSTAT TYPE FV
Platon Type FV Flostats automaꢀcally regulate the ꢁow of liquids or gases by using available line pressure. Once adjusted to
the required value, ꢁow is maintained accurately at this rate independent of supply pressure ꢁuctuaꢀons or varying back
pressure downstream of the meter. No electrical power or external ꢁow measurement input is required – the Flostat control
system uses the available line pressure to control the balanced control valve, maintaining the ꢁow rate at the operator pre-
set value.
Accurate ꢁow control is vital to a wide variety of processes, for example blending and dosing applicaꢀons. By keeping the
required ꢁuid delivery rate constant, a Flostat can ensure consistent product quality irrespecꢀve of process liquid head
changes throughout a batch.
Flostat Type FV Flow controllers are used in ꢁow control systems such as aircraꢂ fuel delivery systems, to prevent the
hazard of excessive ꢁows and protect metering systems from over-speeding. On natural gas or fuel oil delivery systems to
mulꢀple burners, Flostat units can maintain opꢀmum ꢁow rate to each burner independently.
Available in sizes from 15mm to 100mm, all Type FV units can be fiꢃed with a ꢁow scale plate calibrated for process
condiꢀons.
The Flostat combines, in one body, a ꢁow measuring orifice (A) and a balanced control valve (B). With no ꢁow through the
Flostat, the compressed spring opens the double seated valve. When ꢁow
commences, a pressure drop P1-P2 is generated across the orifice (A). This
pressure drop also acts on the diaphragm C, closing the valve against the
spring force. The downstream pressure P3 has no neꢃ effect on the control
valve posiꢀon, because the valve is double seated. At equilibrium, the spring
force, a constant, is equal to the orifice pressure drop, making the ꢁuid ꢁow
constant.
The orifice ꢁow at equilibrium is adjusted by the buꢃerꢁy element, D,
controlled by an external hand wheel. This allows ꢁow adjustment over
typically at 10:1 range. Once set to a ꢁow rate, the Flostat maintains that
ꢁow independent of line pressure ꢁuctuaꢀons, subject to certain minimum
overall head loss requirements.
General Note
TT Electronics | Roxspur Measurement & Control Ltd
2 Downgate Drive, Sheffield, S4 8BT, England |Ph: +44(0)114 244 2521
TT Electronics reserves the right to make changes in product specificaꢀon without
noꢀce or liability. All informaꢀon is subject to TT Electronics’ own data and is
www.roxspur.com | sales@roxspur.com
considered accurate at ꢀme of going to print.
Issue B 7/2017 Page 1
© TT Electronics plc
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