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Platon Automatic Flow Controller DS1521 © TT Electronics plc Issue B 7/2017 Page 1 TT Electronics | Roxspur Measurement & Control Ltd
2 Downgate Drive, Sheffield, S4 8BT, England |Ph: +44(0)114 244 2521
www.roxspur.com | sales@roxspur.com General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. Features: Fully automatic flow 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 automatically regulate the flow of liquids or gases by using available line pressure. Once adjusted to the required value, flow is maintained accurately at this rate independent of supply pressure fluctuations or varying back pressure downstream of the meter. No electrical power or external flow measurement input is required – the Flostat control system uses the available line pressure to control the balanced control valve, maintaining the flow rate at the operator pre- set value. Accurate flow control is vital to a wide variety of processes, for example blending and dosing applications. By keeping the required fluid delivery rate constant, a Flostat can ensure consistent product quality irrespective of process liquid head changes throughout a batch. Flostat Type FV Flow controllers are used in flow control systems such as aircraft fuel delivery systems, to prevent the hazard of excessive flows and protect metering systems from over-speeding. On natural gas or fuel oil delivery systems to multiple burners, Flostat units can maintain optimum flow rate to each burner independently. Available in sizes from 15mm to 100mm, all Type FV units can be fitted with a flow scale plate calibrated for process conditions. The Flostat combines, in one body, a flow measuring orifice (A) and a balanced control valve (B). With no flow through the Flostat, the compressed spring opens the double seated valve. When flow 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 nett effect on the control valve position, because the valve is double seated. At equilibrium, the spring force, a constant, is equal to the orifice pressure drop, making the fluid flow constant. The orifice flow at equilibrium is adjusted by the butterfly element, D, controlled by an external hand wheel. This allows flow adjustment over typically at 10:1 range. Once set to a flow rate, the Flostat maintains that flow independent of line pressure fluctuations, subject to certain minimum overall head loss requirements.
© TT Electronics plc Issue B 7/2017 Page 2 TT Electronics | Roxspur Measurement & Control Ltd www.roxspur.com | sales@roxspur.com General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. Platon Automatic Flow Cotnroller DS1521 SPECIFICATION - STANDARD MODELS Materials Valve Trim Diaphragm Connection Accuracy Repeatability Rangeability Max Pressure Max controllable pressure (P₁ - P₃) 1/2” - 3/4” Brass (FVAB or FVBB) or 316 stainless steel (FVAS or FVBS) 1”- 4” Cast iron (FVC) or 316 stainless steel (FVS) Stainless Steel Nitrile or PTFE 1/2” - 3/4” BSP female threads 1”-4” Flanged to BS, EN or ANSI Liquids ±2% Gases ±3% ±1% 10:1 turndown of flow 16 bar (or flange rating it lower) 8 bar 80˚C with nitrile diaphragm 100˚C with PTFE diaphragm Standard on 1” - 4” units Option on 1/2” - 3/4” units Max temperature Flow scale plate MODELS AVAILABLE For Liquids, the Flostat FV "Type A" units can be used for all applications, whether upstream or downstream pressures are subject to fluctuations. For Gases, two Flostat versions are available, Type A or Type B. Accurate flow control requires that the pressure at the orifice is relatively constant, since gases are compressible. Model FV Type A has the orifice on the upstream port, and is used when the gas supply pressure is regulated or reasonably constant. Model FV Type B has the orifice on the downstream port, and is used when the gas has reasonably constant downstream pressure, or is discharging to atmos- phere. FLOSTAT FV UNITS ARE AVAILABLE IN TWO BODY STYLES, DEPENDING ON LINE SIZE/FLOW CAPACITY.THE SMALLER UNITS ARE 1/2" AND 3/4" LINES WITH BSP SCREWED CONNECTIONS. OPTIONS AVAILABLE Flange fittings available on 1/2” and 3/4” models. Models degreased for oxygen service. Factory preset units. Flow calibration scales for actual process fluids and conditions. TYPICAL APPLICATIONS Accurate blending or dispensing Heating or cooling constant flow Fuel flow to multiple burners Constant irrigation flow Flow control to aircraft refueling metering skids Reverse osmosis flow balancing Over speed protection for pumps and meters Avoiding pressure surge problems Providing stable process conditions Filter flow control Protection against system failure on single line breakage
© TT Electronics plc Issue B 7/2017 Page 3 TT Electronics | Roxspur Measurement & Control Ltd www.roxspur.com | sales@roxspur.com General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. Platon Automatic Flow Controller DS1521 FLOW RANGES AND MODELS Model (Type and Material) Ins Mm Range Code Water Flow (20˚C m³/hr) Air Flow (ATP) m³/h Minimum Pressure Drop (P₁-P₃) Bar Type A FVAB Brass FVAS Stainless Steel Type B FVBB Brass FVBS Stainless Steel 0.5 0.75 0.02-0.27 0.04-0.40 0.08-0.80 0.05-0.54 0.09-0.90 0.16-1.60 0.08-8 1.2-12 2.4-24 1.6-16 2.6-26 4.6-46 0.5 0.8 1.0 0.5 0.8 1.0 Type A FVCA Cast Iron FVSA Stainless Steel Type B FVCB Cast Iron FVSB Stainless Steel 1.5 100 0.1-1 0.2-2 0.3-3 0.2-2 0.4-4 0.8-8 0.4-4 0.8-8 1.6-16 0.8-8 1.6-16 3.2-32 2.0-20 5.0-50 7.5-75 2.5-25 6-60 10-100 6-60 12-120 25-250 12-120 25-250 50-500 25-250 50-500 100-1000 60-600 150-1500 220-2200 0.5 0.8 1.0 0.5 0.8 1.0 0.5 0.8 1.0 0.5 0.8 1.0 0.5 0.8 1.0 Size ALTERNATIVE FLUIDS Consult our Sales staff for information on the flow ranges applicable to other liquids, or gases at different process pressures, for each model. Flow scales can be calibrated for the process fluids in use. Units for larger and smaller flow rates are available. SITE ADJUSTMENT Operator adjustment of the flowrate through the Flostat FV is via the external hand wheel, which controls the orifice size. On larger units, 1” - 4” line sizes, the handwheel is fitted with a pointer to indicate flow setting on a pre- calibrated scale plate. The handle can be locked in position. On 1/2” and 3/4” units the standard unit has no scale plate: flow is adjusted according to other process requirements or flowmeters. A scale plate can be fitted as an option. Flow adjustment can be made over typically a 10:1 flow range. The tabulation shows the pressure drop (P1-P3) required for correct operation at maximum flow rate. This threshold value requirement decreases as the flow setting is reduced – the graph shows the relationship for a Range Code 3 model: normal operation is in the shaded area.
© TT Electronics plc Issue B 7/2017 Page 4 TT Electronics | Roxspur Measurement & Control Ltd www.roxspur.com | sales@roxspur.com General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. Platon Automatic Flow Controller DS1521 Every effort has been made during the preparation of this document to ensure the accuracy of statements and specifications. However, we do not accept liability for damage, injury, loss or expense caused by errors or omissions made. We reserve the right to withdraw or amend products or documentation without notice. Head Office: 2 Downgate Drive, Sheffield, S4 8BT, England Tel: +44(0)114 244 2521 Fax: +44(0)114 243 4838 Size mm C D E F G H J K Weight kg 1/2” 3/4” 100 102 108 118 150 4.5 Size mm L M N P Q R Weight 1½” 100 127 152 181 216 241 102 114 130 140 140 117 138 170 176 197 168 189 265 271 292 117 121 136 140 143 102 121 130 136 13.5 Dimensions Dimensions INSTALLATION REQUIREMENTS 1. Flostats can be installed in any orientation. 2. A vent is fitted on the pressure housing on the top of the diaphragm to allow simple removal of trapped air on liquid Flostats on start up (when installed in horizontal pipework). 3. If possible, the Flostat should be installed with five diameters of straight pipework upstream, and three diameters downstream. (These dimensions are reversed for Type B models). This gives the flow measuring orifice the required working conditions. APPLICATION EXPERTISE Flostat equipment has been manufactured by Platon for over 30 years for many different applications. Apart from provid- ing sizing information for different process conditions, alternative designs are available to suit specific requirements. Please provide full application information for any enquiry, particularly specifying: Pipeline Size Flow range required Fluid type, SG and viscosity if unusual Fluid temperature pressure Required body and diaphragm materials Flange type required For special options, please specify if scale plate or factory preset flowrate required. For gas flows, advise whether Type A or Type B suits the pressure conditions best. For lower flow rates (down to 2cm³/min), please consult leaflet DS1511 describing the Flostat Type MN. 04HWAR0410