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Platon Automatic Flow Controller DS1531 © 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: Automatic - no power required High accuracy - balanced control valve Fast response - short feedback path Simple and reliable PLATON FLOSTAT TYPES B & LB An automatic flow control valve and governor to limit the maximum rate of liquid flow in a pipe -irrespective of pressure changes - whilst presenting the minimum resistance to normal flow. FLOSTAT TYPES B AND LB Automatic Self-Acting Flow Control Valve and Governor for 2”-4” pipes (50mm-100mm) Type B units are factory set for a user defined flow rate Type LB units control at a flow rate adjustable over a 6:1 flow range using the external hand wheel
© 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 DS1531 STANDARD SPECIFICATION Body Valve Trim Diaphragm Connections Control Accuracy Reproducibility Maximum Temperature Maximum Threshold Valve Mild Steel Epoxy Coated or Stainless Steel Stainless Steel Nitrile, Viton or Stainless Steel bellows Flanged to BS, EN or ANSI standards ±5% ±2% Nitrile and Viton 80°C See table 20 bar 25 bar on request Maximum Pressure Hydraulic Test Pressure SPECIAL MODELS High Pressure Pneumatic or electrically-operated set point adjustment of Type LB Irrigation model with special materials and
features
Aviation kerosene units with special shorter overall length Different flow ranges Type MN in brass or Stainless Steel for 1/4” pipe, on liquids or gases (see DS1511) Type V Flostat for variable flow control of gases and liquids 1/2”-4” line sizes (see DS1521) OTHER TYPES OF FLOSTAT PRINCIPLE The Flostat combines, in one body, a flow measuring orifice (A) and a balanced control valve (B). The pressure difference P1–P2 produced at the orifice acts on a pressure responsive element (C), deflects the control spring and positions the butterfly control valve. At a certain load, P1–P3, the equilibrium of force between the diaphragm thrust and the return spring exists at the required flowrate. If the load P1–P3 changes, the valve will be moved to a new position so as to pro- duce the necessary compensation to restore the original flowrate and retain the same P1 –P2 value. The Flostat LB unit also has an external handwheel to adjust the orifice size, which changes the controlled flow value, as shown on a calibrated scale plate. inches mm Low Head Standard High Type LB Variable Setting Max. Standard Pressure Drop Bar 2 50 2-10 4-30 20-60 4-30 10.5 2½ 65 5-15 6-40 30-100 6-40 10.5 3 80 8-20 10-60 40-140 10-60 7 4 100 12-40 20-100 60-200 20-100 5.5 Size Type B Fixed Setting limits Note 1: Adjustment of ±10 of Factory setting can be achieved under No Flow conditions Note 2: Adjustment of ±25% of Factory setting can be achieved under No Flow conditions
© 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 DS1531 FLOSTAT APPLICATIONS The Flostat brings automation of fluid handling within the reach of industries requiring accurate and reliable control with a sub- stantial cost benefit over the conventional servo-operated con- trol valve. Obvious examples of applications for the Flostat are where: Power is not available Control setting is rarely changed Installation positions is remote or dangerous It is necessary to prevent excessive flow There is a need to protect machinery and plant Long term reliability and high accuracy are required Corrosion-resistant and compatible materials are required Low pressure drop and high accuracy required Flostats are utilised to control the cooling water flow in air conditioning and refrigeration plant to maintain optimum efficiency. COOLING AND CONDITIONING WATER TREATMENT Flostats are used on Sand Filters and Gravity Filters to over- come vortex flow in the Filter. In the Pre-Coated Filter, it is necessary on initial start-up to have a high flowrate and during normal running reduce to a lower flowrate, which can be achieved by use of a Two-Position Actuator or manual control. Constant flow through a filter ensures smooth cake infor- mation and maximum length of life. IRRIGATION Flostats limit the flowrate through each outlet, ensuring even distribution and efficient use of the limited supply of water, which is coupled to large seasonal variations. PUMP SAFETY Flostats prevent overspeed and cavitation when pump supply varies. METER PROTECTION Flostats allow improved pumping economies at oil terminals. Each of the bulk meters is protected from excessive load and overspeed- ing so that one pump can serve many loading points. A similar unit is utilised to prevent overspeeding of oxygen meters on distribution systems and to minimise the possibility of explosion. The Flostat has countless applications including: Absorbers, Aerators, Centrifuges, Chillers, Condensers, Dryers, Evaporators, Extractors, Fermenters, Filters, Heat Exchangers, Homogenisers, Reverse Osmosis, Scrubbers, Softeners, Sprays, Stills Blending of Fluids to a fixed formula Dispensing of Fluids into accurate fractions Chemical reactions where stability is a key factor Constant flow on heating or cooling circuits Filtration with improved efficiency and filter life Protection of equipment from excessive flows Burner control providing quick start-up and temperature zoning Aggregate particle size separation Ratio of powder fluidisation and conveying Batch control Irrigation Feed from a pump or tank is divided and maintained in correct proportion to any number of requirements and not affected by variations in line pres- sure. The Flostat ensures maximum efficiency by planned distribution. DISTRIBUTION AND BLENDING OF FLUIDS
© 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 DS1531 ENQUIRIES When placing an enquiry, please give all possible details as the manufacturers have great accumulated experience in this spe- cialised field and could contribute valuable guidance. Certainly do not omit to specify the following: Pipe Size Preferred Materials and Connections Control Setting and if adjustment required Pressure conditions upstream and downstream Fluid including SG and viscosity if unusual, with temperature CALIBRATION For permanent and accurate control, it is only necessary to ensure that the available pressure does not fall below the Threshold Value which is the minimum required to provide the control force and to overcome friction losses (P1-P3). INSTALLATION Each Flostat is calibrated with a straight approach pipe and spring housing vertical. To reproduce the factory calibration precisely, the installation should be similar, however, the fric- tion with the butterfly spindle at other attitudes is extremely small. The Flostat should be orientated so that sludge does not accu- mulate in the pressure responsive housing. With liquid flows, it is desirable that the controller does not fill with air when liquid flow stops.
© TT Electronics plc Issue B 7/2017 Page 5 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 DS1531 Every effort has been made during the preparation of this document to ensure the accuracy of statements and specifications. H owever, 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 04HWAR0311 in’s mm in’s mm in’s mm in’s mm in’s mm Size 2 50 2½ 65 3 80 4 100 6 150 A 10½ 267 10½ 267 10½ 267 11 279 13 330 B 5¼ 133 5¼ 133 5¼ 133 5¼ 139 6 152 C 8½ 216 8½ 216 8 3/4” 222 9¼ 235 15 381 FLOSTAT TYPE ‘LB’ FLOSTAT TYPE ‘B’ DIMENSIONS TYPE ‘B’ Note: Certain models built for aviation fuel control have smaller axial dimensions in’s mm in’s mm in’s mm in’s mm Size 2 50 2½ 65 3 80 4 100 A 13½ 343 13½ 343 14 356 15½ 394 B 5¼ 133 5¼ 133 5 3/4 146 5 7/8 149 C 8½ 216 8 3/4 222 8 3/4 222 9 229 D 4 3/4 120 5 ¼ 133 5 ¼ 133 5 3/4 146 in’s mm ‘B’ ‘LB’ 2 50 12 14 2 ½ 65 15 17 3 80 19 22 4 100 25 30 6 150 41 N/A WEIGHT IN KG DIMENSIONS TYPE ‘LB’