Flow Control
Todays deals on Flow Control?
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UNIVERSAL FLOW MONITORS WVL300GM-24-R1WR CONTROL VALVE $3,500.00 |
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BROOKS 6256S MFC MASS FLOW CONTROLLER,KITS SCT VALVE $2,599.99 |
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AERA TC FC-985CY-BF ASSY MFC MASS FLOW CONTROLLER, $2,099.99 |
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BROOKS MASS FLOW CONTROLLER # 5853-I 1″ BODY SIZE $1,875.00 |
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UNIT INSTRUMENT MODEL UFC-8105 MASS FLOW CONTROLLER N2 1,000 SLM 0995-10795 R $1,800.00 |
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5x Stec SEC4400M MASS FLOW CONTROLLER / USED $1,599.00 |
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(Brand new) HORIBA STEC MASS FLOW CONTROLLER (sell one lot 5 units) $1,750.00 |
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New Horiba Stec SEC-4600M Mass Flow Controller H2 50SLM $1,659.99 |
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New Horiba Stec SEC-4550M Mass Flow Controller N2O 20 LM $1,659.99 |
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Bronkhorst E-7210 Mass Flow-Bus Controller Digital Power Supply / Readout System $1,500.00 |
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TYLAN FC-2910V MASS FLOW CONTROLLER *NEW* $1,500.00 |
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MicroMotion 3700 Series Flow Transmitter Controller 3700A1A03DUEZBZ $1,500.00 |
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CKD PARECT PRESSURE CONTROL FLOW SPLITTER TPR4-25-A020T X0101 2L80-001337-11 $1,499.99 |
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STEC, SEC MFC,ASSY, SEC-7330M-C-UC,SEC-7340M-C-UC,MASS FLOW CONTROLLER, $1,459.99 |
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STEC, SEC MFC,ASSY, SEC-7330M-C-UC,,MASS FLOW CONTROLLER,500 SCCM,C1F3 5 SLM $1,399.99 |
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Unit UFC-8100 Mass Flow Controller 500 PSI, 10 SLM O2 $299.99 |
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Horiba STEC SEC-4400M N2 Mass Flow Controller SEC-4400 5 SLM $1,249.99 |
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Horiba STEC SEC-4400MC Mass Flow Controller SEC-4400 NH3 150 SCCM $1,249.99 |
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AERA Mass Flow Controller FC-D985c TC FC-D985CT-BH 2000 CCM AR MFC $1,200.00 |
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Foxboro Consotrol 130F-N4 Flow Indicating Controller $1,250.00 |
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DANIEL Industries 2500 Controller Microcomputer Flow Computer $1,225.00 |
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@P6 Partlow MIC 8200 Temperature Flow Pressure Controller 1/4 DIN Profile Loop $1,225.95 |
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FCI GF90 Digital Flow Controller Killark GRL-600L FE501 $1,200.00 |
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Celerity GF-125 Digital Mass Flow Controller (Cal’d any Gas/Range) 1 Yr Wrnty $1,175.00 |
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ENTEGRIS 6500-T5-F04-B06-K-P1-U1-M29 NT INTEGRATED FLOW CONTROLLER 0-2.5 L/MIN N $1,120.00 |
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NEW ALICAT SCIENTIFIC MC-1SLPM-D/5M MASS FLOW CONTROLLER 5IN GAS O2 0-1 SLPM $1,089.99 |
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EG&G Flow Technology FC-70A Batch / Temp Controller $1,100.00 |
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Horiba STEC SEC-4400RC Mass Flow Controller SEC-4400 1 SLM AR $1,049.99 |
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Millipore VC-49000VRH H2O Vapor 4900 Flow Controller $1,023.99 |
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Millipore VC-49000VRH H2O Vapor 4900 Flow Controller $1,023.99 |
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ATEQ DP FLOW METER INDIRECT FLOW TESTER CONTROLLER $999.99 |
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TEC SEC-4400 Series Mass Flow Controller SEC-4400M CF4 100 CCM $999.99 |
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TEC SEC-4400 Series Mass Flow Controller SEC-4400M CL2 300 CCM $999.99 |
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SEC-4400M Series Mass Flow Controller SEC-4400M N2 $999.99 |
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TEC SEC-4400 Series Mass Flow Controller SEC-4400M SF6 100 CCM $999.99 |
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TEC SEC-4400 Series Mass Flow Controller SEC-4400M O2 300 SCCM $999.99 |
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TEC SEC-4400 Series Mass Flow Controller SEC-4400M O2 1000 CCM $999.99 |
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TEC SEC-4400 Series Mass Flow Controller SEC-4400M He 30 CCM $999.99 |
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TEC SEC-4400 Series Mass Flow Controller SEC-4400M CF4 100 CCM $999.99 |
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TEC SEC-4400 Series Mass Flow Controll SEC-4400M CH3OH 200 SCCM $999.99 |
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TEC SEC-4400 Series Mass Flow Controller SEC-4400MC-UC $999.99 |
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TEC SEC-4400 Series Mass Flow Controller SEC-4400MC-UC CH3OH 50 CCM $999.99 |
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ASM Mass Flow Controller (MFC) AFC-202 N2 50 SCCM $998.99 |
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Rexroth Bosch Hydraulic Flow Control Valve 1 815 500 328 $1,000.00 |
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MKS P5A004103R6T023 MFC Mass Flow Controller Ar 1000 $995.00 |
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HORIBA STEC DIGITAL MASS FLOW CONTROLLER Z500 MODEL#SEC-Z512MG 330000129 B $1,000.00 |
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HORIBA STEC DIGITAL MASS FLOW CONTROLLER N2 100SCCM SEC-Z512MG 330000128 B $1,000.00 |
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NEW VICKERS 420607 FLOW CONTROL VALVE FCG 02 1500 50 K98S $995.00 |
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BROOKS INSTRUMENT 5851EA11BQ2D2BA MASS FLOW CONTROLLER $1,000.00 |
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BROOKS INSTRUMENT BROOKS-5851 MASS FLOW CONTROLLER $1,000.00 |
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TYLAN FC-2910V MASS FLOW CONTROLLER *NICE* $1,000.00 |
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MKS Type 148J-01000 Pressure and Flow Control Valve $999.99 |
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Source IV 908607 Mass Flow Controller Gas H2 Flow 7.5 $974.99 |
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Tylan / Millipore FC-2960M Mass Flow Controller NEW $911.33 |
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Unit Instruments UFC-8100 Mass Flow Controller N2 500 SCCM $899.99 |
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New Aera FC-D980C Mass Flow Controller $899.99 |
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LOT OF 5 HORIBA STEC SEC-4400 MASS FLOW CONTROLLERS $899.99 |
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BROOKS MASS FLOW CONTROLLER 5851S/BD1EA1EC2AA1A 50/50 O2 N2 50 SLM H3400132 B $900.00 |
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Unit UFC-1500AU Mass Flow Controller GAS AR Flow 1000 $909.99 |
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NEW MKS MODEL# 1479A HELIUM 20000SCCM MASS FLOW CONTROLLER 623313 R $900.00 |
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UNIT INSTRUMENT MODEL UFC-8105 MASS FLOW CONTROLLER N2 10,000 SLM 0995-10797 R $900.00 |
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General Regulator- Air Flow Controller – P/N # 30516-01 $875.00 |
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Foxboro Consotrol 130P-N4 Flow Indicating Controller $900.00 |
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ABB VO54 FLOW ECONOMIZER MOTOR DRIVE CONTROL 40 HP $799.99 |
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Tylan FC-2900V Mass Flow Controller Gas N2 Range 9 SLM $899.99 |
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ABB VO54 FLOW ECONOMIZER MOTOR DRIVE CONTROLLER 40 HP $799.99 |
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LOT OF 6 TYLAN 2979 SERIES MASS FLOW CONTROLLER FC-2979 $799.99 |
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UNIT UFC-8100 MFC Mass Flow Controller 500 PSI SEALED NEW with Spec Sheet $895.00 |
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UNIT CELERITY MASS FLOW CONTROLLER MODEL UFC-8160 FC-980 N2 10SCCM 3300148 B $875.00 |
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Celerity IFC-125C Digital Mass Flow Controller (Cal’d any Gas/Range) 1 Yr Wrnty $875.00 |
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MKS 649A-25465 Mass Flow Controller Gas 500 SCCM $874.99 |
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Celerity MSSAD2B1 Mass Flow Controller Gas N2 Range 859-2188 (1000) $874.99 |
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Aera FC-7810CD Mass Flow Controller GAS NH3 Flow/Range 20000 SCCM $874.99 |
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MASS FLOW CONTROLLER AERA FC-D980C Gas:Ar Range:100Sccm $836.00 |
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MKS 1559A 11595 MASS FLOW CONTROLLER 200SLM GAS AR $850.00 |
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MKS DSSAD100 Mass Flow Controller Gas N2 Flow 2000 $849.99 |
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Unit UFC-1100 Mass Flow Control GAS H2 Flow 10000 SCCM $849.99 |
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PARKER TPC1200S28 HYDRAULIC FLOW CONTROL VALVE TPC-1200-S-28 3/4″ NPT MANATROL $849.99 |
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Unit UPC-1300 Mass Flow Controller N2 500SCCM $824.99 |
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Tylan FC-2900V Mass Flow Controller GAS CF4 Flow/Range 200 SCCM $844.99 |
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Tylan VC-4900M Mass Flow Controller GAS BCL3 Flow/Range 200 SCCM $839.99 |
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Tylan FC-2900V Mass Flow Controller GAS CL2 Flow/Range 1000 SCCM $837.99 |
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Tylan FC-2900VF Mass Flow Controller GAS HE Flow/Range 200 SCCM $834.99 |
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Unit UFC-8565C Digital Mass Flow Controller (Cal’d any Gas/Range) 1 Yr Wrnty $825.00 |
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Aera FC-7800-CD Mass Flow Controller N2 5000 SCCM $824.99 |
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SKC AirChek Sampler 224-44XR & OMEGA mass flow controller $719.20 |
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NEW Entegris NT6500 CMP Integrated Flow Controller 3/8″ Liquid $816.99 |
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Unit UFC-1660 Mass Flow Controller GAS HBR Flow 100 SCCM $814.99 |
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BROOKS 5850-D MASS FLOW CONTROLLER 20 SCCM RANGE $799.99 |
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COASTAL INSTRUMENTS UFC-1100A MASS FLOW CONTROLLER $799.99 |
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Tylan FC-2950MEP5 Mass Flow Controller GAS N2 Flow/Range 200 SCCM $812.99 |
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BROOKS 5850-D MASS FLOW CONTROLLER 50 SCCM RANGE $799.99 |
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Allen-Bradley Enclosure Heat Flow Enclosure / Controller PV CV $809.17 |
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NEW MKS MASS FLOW CONTROLLER MODEL# 1179A NITROGEN 3000 SCCM 0995-10856 R $800.00 |
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NEW MKS P5A004103R6T023 FLOW CONTROL $800.00 |
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COAX MK102C116BPB1/4P2OXB FLOW CONTROL W/SOL. VALVE NEW $799.99 |
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Unit Instruments UFC-1100 Mass Flow Controller Gas HE 500SCCM $804.99 |
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SEC SEC-4400M Mass Flow Controller Gas SIH2CL2 500 SCCM $799.99 |
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Unit UFC-1000 Mass Flow Controller Gas N2 200 SCCM $799.99 |
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Tylan FC-2900VF Mass Flow Controller GAS CF4 FLow/Range 200 SCCM $799.99 |
Flow Control Questions
Selection of the best control valve for flotation column and cell control
There are a various types of valves which can be utilized in flotation column and flotation cell control. The type of valve used on flotation columns may vary from a flotation cell. For example dart valves have been traditionally utilized on flotation cells. In larger mining operations the sizes of flotation cells have grown and so must the size of the valves. In certain designs the dart valve may require an external box built onto the exterior of the flotation cell, which may be large and costly to manufacture. Another hindrance is that the containment box may need to be drained to allow maintenance on the dart valve.
There are alternate types of valves that do not require the dart valve containment box which may allow for a less expensive total assembly and provide accurate and reliable control of the flotation cells. Although, the low driving head in flotation cells may create challenges in selection of the control valve size. For this reason, control valve sizing on flotation cells requires more consideration of piping effects. Inlet and outlet velocities from the cells as well as any 90 degree turns or elbows at the outlet may play a significant role in decreasing the driving head and thus force the selection of a larger diameter control valve. Control valve sizing in flotation cells requires more consideration of piping effects due to the low driving head. The ultimate goal is accurate flow control to maximize pulp retention time and minimize downtime. Some manufacturers have developed special sizing programs that automatically calculate the decreased driving head caused by elbows, bends, inlet and outlet tank effects.
Pinch valves have been utilized successfully in small and large sizes to eliminate the need for external boxes and additional material costs. The pinch valve provides very accurate flow control and a very long service lifetime.
One valve in worth of mentioning is a pinch valve is located at Boliden Aitik copper mine. It has been continuously operating without a rubber sleeve change for 22 years. This is the oldest know reference for a Larox valve installed on flotation control. Figure attached depicts the valve located on the outlet of the last cell.To insure the last valve will not cavitate the piping is shaped like a J before it departs to its final destination. This J section creates a few feet of head pressure to insure the full pressure drop is not taken across the valve. It is simple inexpensive manner to insure the prevention of cavitation. Cavitation can cause short sleeve lifetime and unpredictable control due to the pulsing effects of cavitation.
In flotation columns the design of the outlet piping may or may not have severe effects on the control valve utilized to control the level in the column. If the column is 30 feet in height then the driving head is the pressure created by the head times the specific gravity. In most cases the driving head is sufficient enough that a simple calculation can be made to determine the size of valve required and Cv without any special sizing program to calculate downstream piping effects. However if the valve is required to take the full pressure drop across it then there is a high risk of cavitation. Again the J tube arrangement should be employed to create some back pressure on the control valve to limit the amount of pressure drop the valve must take and prevent cavitation from occurring across the valve. In a flotation column a J tube that is 50% of the column height with a vacuum breaker at the top will provide adequate protection to prevent cavitation.
The rule of thumb with a pinch valve is to limit the pressure drop across the valve to 50% of the inlet pressure to the valve. If you do this in most cases then the valve will not cavitate.
Global service, local reach
Larox Flowsys Group has more than 100 employees and the number is growing. Headquartered in Lappeenranta, Finland Larox Flowsys Group has subsidiaries in Linthicum, Maryland (USA), Sydney (Australia) as well as in Kouvola (Finland). As almost 80% of the company’s net sales come from global exports, the reliable and fast customer service is guaranteed by an international sales and service network, covering over 55 countries.
To learn more about Larox Flowsys and its expanded product offerings and brands, visit www.larox.fi.
About the Author
Flow Control Videos
Lecture – 25 Flow Control Valves
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