1. Micro Pump without use of check valves to achieve no pulsation flow
株式会社フロム　渋谷大介、大野洋平、舟越省司、○南部浩章、関口陽子
Micro Pump without use of check valves to achieve no pulsation flow
Authors: Satoshi Nakamura, Takafumi Shimizu and Ken Kitamura, FLOM Corporation
Introduction
Methodology
Result and Discussion
1. Name of Component Parts
Specifications
Current pump plungers are designed to operate continuously in high pressure and high performance environments including analytical applications in chemical synthesis, reaction chemistry and HPLC. Controlled and precise flow can be affected by check valve design and performance.
Product Name
Linear Drive Pump with Switching Valve
Left :
Right :
Pressure Sensor for Primary Pump
Pressure Sensor for Secondary Pump
/ Outlet Port
Maximum Pressure
350 bar (5075 psi) as expected
Outlet port
Flow Rate Range
1 uL ~ 1000 uL/ Min.
Left :
Right :
Primary Pump Head
Secondary Pump Head
Flow Accuracy
±0.3 %
Pump Driving Method
Linear Drive
Plunger stroke
10 mm
4-port Switching Valve / Inlet port
(Substitute Using Check Valves)
Pump + Valve
Pump
Uncertainty of check valve is now resolved with using switching valve!
Valve
Inlet port
Pressure Accuracy
< 5 %
Direction of flow
Features
Flow Volume Calibration, Upper/ Lower Pressure Limiter
2. Principle of Operation
Wetted Materials
Stainless Steel (SUS 316), Sapphire, Ruby, PTFE, PCTFE, Teflon Elastomer, High-density Polyethylene
Description of procedure
Direction of Plunger Motion
Primary Pump Head
Secondary Pump Head ①
Suction
Position of Switching Valve
Direction of Plunger Motion
Direction of Plunger Motion
Remote Control
Input: Pump On/ Off, Output: Error Signal
Communication
RS232C
Dimensions
130 (H) x 160 (W) x 280 (D) mm
Weight
Approximately 7 Kg ②
Compression
Position of Switching Valve
Direction of Plunger Motion
Direction of Plunger Motion
Advantages
Check valve malfunction has been eliminated
No flow fluctuation
Reduced maintenance
Flow rate selectable in 1 uL/min.
Can be used with high density solvents ③
Discharge
Position of Switching Valve
Direction of Plunger Motion
Direction of Plunger Motion
Pressure (=Flow Volume)
Primary Pump Head
Secondary Pump Head
In this report, we describe the development of a micro flow pump with a target flow rate range less than 1.0mL/min. With applying an ultra high durability switching valve which passes 1,000,000 cycles in 2-position switching operation and linear drive pump which has 10mm long plunger stroke with real time pressure monitoring function. The result has been the elimination of the backlash and flow fluctuation contributed by the check valve.
This new pump, which has a flow rate increment of 1.0 uL/min, is recommended for analysts who require the ultimate in precision with virtually no pump pulsations.
Daily display of prototype at FLOM Corporation (Booth #5153)
Solvent: Water
Flow Rate: 200 uL/min.
Pressure: 90 bar (1300 psi)
Solvent: Water
Flow Rate: 500 uL/min.
Pressure: 165 bar (2390 psi)
FLOM Corporation.
Shinmachi, Ome, Tokyo Japan