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Fluid Metering Pump Animation
Fluid Metering Pump Animation
Published: 2011/05/05
Channel: fmipumps
Diaphragm metering pump - Animation in Blender
Diaphragm metering pump - Animation in Blender
Published: 2016/06/30
Channel: The Blender
Process Metering Pump Orlita® Evolution: Maximum process reliability
Process Metering Pump Orlita® Evolution: Maximum process reliability
Published: 2015/06/10
Channel: ProMinent
MILTON ROY
MILTON ROY'S mROY METERING PUMP
Published: 2016/05/31
Channel: Milton Roy, LLC
3D Metering/Dosing  Pump Animation | How FMI Valveless Metering Pumps work
3D Metering/Dosing Pump Animation | How FMI Valveless Metering Pumps work
Published: 2014/09/25
Channel: Fluid Metering, Inc
Diaphragm Pump - Dosing/Metering Pump Working Animation.
Diaphragm Pump - Dosing/Metering Pump Working Animation.
Published: 2014/03/29
Channel: Sriram Balasubramanian
LEWA ecoflow
LEWA ecoflow
Published: 2012/05/30
Channel: LEWA- Creating Fluid Solutions
IWAKI Metering pumps IX series
IWAKI Metering pumps IX series
Published: 2016/07/26
Channel: IWAKI PUMPS
Pulsation Dampeners for Metering Pumps
Pulsation Dampeners for Metering Pumps
Published: 2014/04/06
Channel: blacoh
"TRANSFLO" Air Operated Diaphragm Type Metering Pump Demo
"TRANSFLO" Air Operated Diaphragm Type Metering Pump Demo
Published: 2012/05/22
Channel: Transflo Pumps
AeroMarine Metering Pump
AeroMarine Metering Pump
Published: 2012/05/23
Channel: AeroMarine Products Tech Support
Working Principle of a Hydraulic Diaphragm Metering Pump
Working Principle of a Hydraulic Diaphragm Metering Pump
Published: 2016/10/17
Channel: skillspreeinfo
How To Rebuild a Walchem Metering Pump
How To Rebuild a Walchem Metering Pump
Published: 2016/09/12
Channel: Valin Corporation
E Series Metering Pumps
E Series Metering Pumps
Published: 2015/10/28
Channel: Walchem
Eberspacher VW Gas Heater - BN4 Metering Pump Restoration Restore
Eberspacher VW Gas Heater - BN4 Metering Pump Restoration Restore
Published: 2016/01/31
Channel: Jason Weigel
High Quality Solenoid Dosing Pump
High Quality Solenoid Dosing Pump
Published: 2016/11/30
Channel: Grosvenor Pumps Ltd
Positive Metering Pumps
Positive Metering Pumps
Published: 2012/05/16
Channel: ANT Pumps
mazda rotary oil metering pump modified.
mazda rotary oil metering pump modified.
Published: 2009/07/11
Channel: MrRooster67
동일엠티(Dong-il M.T) Dosing(metering) Pump animation
동일엠티(Dong-il M.T) Dosing(metering) Pump animation
Published: 2015/11/07
Channel: dongilpump
Chemical Dosing metering pump Piston and Diaphragm
Chemical Dosing metering pump Piston and Diaphragm
Published: 2016/01/14
Channel: Grosvenor Pumps Ltd
Bran+Luebbe NOVADOS H 8 Metering Pump
Bran+Luebbe NOVADOS H 8 Metering Pump
Published: 2015/06/10
Channel: SPX FLOW, Inc.
Milton Roy MRoy Animation Courtesy of Milton Roy America
Milton Roy MRoy Animation Courtesy of Milton Roy America
Published: 2011/10/28
Channel: Cortech100
Grundfos Smart Digital metering pump
Grundfos Smart Digital metering pump
Published: 2013/05/30
Channel: FluidHandlingEqmt
Pulsation Dampeners for Metering Pumps
Pulsation Dampeners for Metering Pumps
Published: 2016/07/29
Channel: Springer Pumps
Metering Pump gamma/ X: Maximum Efficiency
Metering Pump gamma/ X: Maximum Efficiency
Published: 2015/05/15
Channel: ProMinent
LMI Milton Roy A171-151 Metering pump
LMI Milton Roy A171-151 Metering pump
Published: 2016/08/10
Channel: HiTechTrader.Com
How To Properly Install a Diaphragm on an LMI Pump Video
How To Properly Install a Diaphragm on an LMI Pump Video
Published: 2015/06/18
Channel: Valin Corporation
Pulsafeeder PULSAtron Series Metering Pumps - Priming your pump
Pulsafeeder PULSAtron Series Metering Pumps - Priming your pump
Published: 2016/03/10
Channel: Pulsafeeder
Pulsafeeder PULSAtron Series Metering Pumps Installation
Pulsafeeder PULSAtron Series Metering Pumps Installation
Published: 2016/04/06
Channel: Pulsafeeder
chemical dosing pump maintenance
chemical dosing pump maintenance
Published: 2014/11/12
Channel: Andre Bedard
Chemical dosing pump how it work with practical
Chemical dosing pump how it work with practical
Published: 2016/11/09
Channel: Motor Circuits
Pressure gauge / metering pump.
Pressure gauge / metering pump.
Published: 2011/05/22
Channel: Joe's Boilers Channel
EXCEL XR METERING PUMP - Calibration (English)
EXCEL XR METERING PUMP - Calibration (English)
Published: 2016/05/03
Channel: LMI Pumps
Rx8 breakdown to reach oil metering pump injectors... Part 1
Rx8 breakdown to reach oil metering pump injectors... Part 1
Published: 2017/11/04
Channel: Garrett Sendor
Madden Manufacturing - Diaphragm Metering Pumps: Mechanically actuated pumps explained
Madden Manufacturing - Diaphragm Metering Pumps: Mechanically actuated pumps explained
Published: 2015/11/06
Channel: Madden Manufacturing, Inc.
Stenner Pump Company - Peristaltic Metering Pumps
Stenner Pump Company - Peristaltic Metering Pumps
Published: 2010/09/28
Channel: metexcorporation
Bleeding Air from the Hydraulic Side of a Diaphragm Metering Pump
Bleeding Air from the Hydraulic Side of a Diaphragm Metering Pump
Published: 2014/07/18
Channel: AquFlow Pumps
Trailer: The new Metering Pump gamma/ X! Die neue Dosierpumpe gamma/ X!
Trailer: The new Metering Pump gamma/ X! Die neue Dosierpumpe gamma/ X!
Published: 2015/03/20
Channel: ProMinent
Precision-24 Pulse Proportional Flow Metering Pump Wiring
Precision-24 Pulse Proportional Flow Metering Pump Wiring
Published: 2015/11/19
Channel: Clean Water Store
Gear Metering Pump Assembly Animation
Gear Metering Pump Assembly Animation
Published: 2017/09/27
Channel: Slack & Parr Ltd
PROTEUS Metering Pump:  "How-to"  Calibrate to your Process
PROTEUS Metering Pump: "How-to" Calibrate to your Process
Published: 2016/09/16
Channel: Milton Roy, LLC
Jebao dp4 dosing pump calibration
Jebao dp4 dosing pump calibration
Published: 2016/07/19
Channel: Theaquaman
Peristaltic dosing pump
Peristaltic dosing pump
Published: 2015/07/13
Channel: Julio Zaga
ProSeries-M Metering Pumps for Municipal Water Treatment
ProSeries-M Metering Pumps for Municipal Water Treatment
Published: 2015/04/14
Channel: Blue-White Industries, Ltd.
Metering Pump gamma/ X: Intuitive Operation
Metering Pump gamma/ X: Intuitive Operation
Published: 2015/04/14
Channel: ProMinent
Automatic Metering Pump (Digital Liquid Dispenser)_us
Automatic Metering Pump (Digital Liquid Dispenser)_us
Published: 2017/01/06
Channel: Y2L
Control Spool Valve of a Hydraulic Diaphragm Metering Pump
Control Spool Valve of a Hydraulic Diaphragm Metering Pump
Published: 2015/03/23
Channel: AquFlow Pumps
Kamoer X4 101: Assembly, Installation & Operation
Kamoer X4 101: Assembly, Installation & Operation
Published: 2017/04/04
Channel: CoralVue
Grundfos Dosing pump DMBวิธีการใช้งาน
Grundfos Dosing pump DMBวิธีการใช้งาน
Published: 2017/04/27
Channel: สระว่ายน้ําพูดได้ By WINWIN POOL
JEBAO DP-4 Dosing Pump: How to set up and review.
JEBAO DP-4 Dosing Pump: How to set up and review.
Published: 2015/05/28
Channel: SIMUANGCO2468
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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A metering pump moves a precise volume of liquid in a specified time period providing an accurate volumetric flow rate.[1] Delivery of fluids in precise adjustable flow rates is sometimes called metering. The term "metering pump" is based on the application or use rather than the exact kind of pump used, although a couple types of pumps are far more suitable than most other types of pumps.

Although metering pumps can pump water, they are often used to pump chemicals, solutions, or other liquids. Many metering pumps are rated to be able to pump into a high discharge pressure. They are typically made to meter at flow rates which are practically constant (when averaged over time) within a wide range of discharge (outlet) pressure. Manufacturers provide each of their models of metering pumps with a maximum discharge pressure rating against which each model is guaranteed to be able to pump against. An engineer, designer, or user should ensure that the pressure and temperature ratings and wetted pump materials are compatible for the application and the type of liquid being pumped.

Most metering pumps have a pump head and a motor. The liquid being pumped goes through the pump head, entering through an inlet line and leaving through an outlet line. The motor is commonly an electric motor which drives the pump head.

Piston pumps[edit]

Cross-section of piston metering pump head towards end of suction and discharge strokes. Blue arrow shows direction of flow allowed through check valves.
A metering pump for Additives and Diesel

Many metering pumps are piston-driven. Piston pumps are positive displacement pumps which can be designed to pump at practically constant flow rates (averaged over time) against a wide range of discharge pressure, including high discharge pressures of thousands of psi.

Piston-driven metering pumps commonly work as follows: There is a piston (sometimes called plunger), typically cylindrical, which can go in and out of a correspondingly shaped chamber in the pump head. The inlet and outlet lines are joined to the piston chamber. There are two check valves, often ball check valves, attached to the pump head, one at the inlet line and the other at the outlet line. The inlet valve allows flow from the inlet line to the piston chamber, but not in the reverse direction. The outlet valve allows flow from the chamber to the outlet line, but not in reverse. The motor repeatedly moves the piston into and out of the piston chamber, causing the volume of the chamber to repeatedly become smaller and larger. When the piston moves out, a vacuum is created. Low pressure in the chamber causes liquid to enter and fill the chamber through the inlet check valve, but higher pressure at the outlet causes the outlet valve to shut. Then when the piston moves in, it pressurizes the liquid in the chamber. High pressure in the chamber causes the inlet valve to shut and forces the outlet valve to open, forcing liquid out at the outlet. These alternating suction and discharge strokes are repeated over and over to meter the liquid. In the back of the chamber, there is packing around the piston or a doughnut-shaped seal with a toroid-shaped sphincter-like spring inside compressing the seal around the piston. This holds the fluid pressure when the piston slides in and out and makes the pump leak-tight. The packing or seals can wear out after prolonged use and can be replaced. The metering rate can be adjusted by varying the strokelength by which the piston moves back and forth or varying the speed of the piston motion.

A single-piston pump delivers liquid to the outlet only during the discharge stroke. If the piston's suction and discharge strokes occur at the same speed and liquid is metered out half the time the pump is working, then the overall metering rate averaged over time equals half the average flow rate during the discharge stroke. Some single-piston pumps may have a constant slow piston motion for discharge and a quick retract motion for refilling the pump head. In such cases, the overall metering rate is practically equal to the pumping rate during the discharge stroke.

Pumps used in high-pressure chromatography[edit]

Pumps used in high-pressure chromatography such as HPLC and ion chromatography are much like small piston metering pumps. For wear resistance and chemical resistance to solvents, etc., typically the pistons are made of artificial sapphire and the ball check valves have ruby balls and sapphire seats. To produce good chromatograms, it is desirable to have a pumping flow rate as constant as possible. Either a single piston pump with a quick refill is used or a double pump head with coordinated piston strokes is used to provide as constant a pumping rate as possible.

Diaphragm and peristaltic pumps[edit]

In order to avoid leakage at the packing or seal particularly when a liquid is dangerous, toxic, or noxious, diaphragm pumps are used for metering. Diaphragm pumps have a diaphragm through which repeated compression/decompression motion is transmitted. The liquid does not penetrate through the diaphragm, so the liquid inside the pump is sealed off from the outside. Such motion changes the volume of a chamber in the pump head so that liquid enters through an inlet check valve during decompression and exits through an outlet check valve during compression, in a manner similar to piston pumps. Diaphragm pumps can also be made which discharge at fairly high pressure. Diaphragm metering pumps are commonly hydraulically driven.

Peristaltic pumps use motor-driven rollers to roll along flexible tubing, compressing it to push forward a liquid inside. Although peristaltic pumps can be used to meter at lower pressures, the flexible tubing is limited in the level of pressure it can withstand.

Possible problems[edit]

The maximum pressure rating of a metering pump is actually the top of the discharge pressure range the pump is guaranteed to pump against at a reasonably controllable flow rate. The pump itself is a pressurizing device often capable of exceeding its pressure rating, although not guaranteed to. For this reason, if there is any stop valve downstream of the pump, a pressure relief valve should be placed in between to prevent overpressuring of the tubing or piping line in case the stop valve is inadvertently shut while the pump is running. The relief valve setting should be below the maximum pressure rating that the piping, tubing, or any other components there could withstand.

Liquids are only very slightly compressible. This property of liquids lets metering pumps discharge liquids at high pressure. Since a liquid can be only slightly compressed during a discharge stroke, it is forced out of the pump head. Gases are much more compressible. Metering pumps are not good at pumping gases. Sometimes, a metering or similar pump has to be primed before operation, i. e. the pump head filled with the liquid to be pumped. When gas bubbles enter a pump head, the compression motion compresses the gas but has a hard time forcing it out of the pump head. The pump may stop pumping liquid with gas bubbles in the pump head even though mechanically the pump is going through the motions, repeatedly compressing and decompressing the bubbles. To prevent this type of "vapor lock", chromatography solvents are often degassed before pumping.

If the pressure at the outlet is lower than the pressure at the inlet and remains that way in spite of the pumping, then this pressure difference opens both check valves simultaneously and the liquid flows through the pump head uncontrollably from inlet to outlet. This can happen whether the pump is working or not. This situation can be avoided by placing a correctly rated positive pressure differential check valve downstream of the pump. Such a valve will only open if a minimum rated pressure differential across the valve is exceeded, something which most high-pressure metering pumps can easily exceed.

References[edit]

  1. ^ Metering Pump Selection Guide, Cole Parmer Instrument Company, retrieved June 2012  Check date values in: |access-date= (help)

External links[edit]

Siphon Pump metering is now repeatable with a high level of accuracy and control with flow control at the crown or bend of the siphon conduit. A controlled-volume is dispensed through an inline metering chamber by cyclically starting and stopping the siphon flow to replenish the holding canister. Siphons can be used in this manner to supply a variety of liquids above or away from the source. See Siphon article Siphon pump.

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