Supercoiled polymer-actuated pinch valve

2021 ◽  
Author(s):  
Konstantin L. Borissov ◽  
Henry Tran ◽  
John D. W. Madden
Keyword(s):  
Pinch Valve

Investigation of Different Liquid Silicone Rubbers for Micro Pinch Valves

2014 ◽  
Vol 611-612 ◽  
pp. 876-882 ◽  
Author(s):  
Andreas Loth ◽  
Ralf Förster
Keyword(s):  
Silicone Elastomer ◽  
Dead Volume ◽  
Tube Material ◽  
Laboratory Sample ◽  
Pinch Valve ◽  
Pressure Tolerance ◽  
Liquid Silicone ◽  
Technical Properties ◽  
Silicone Rubbers ◽  
Dosage Frequency

A novel pinch valve has been developed for micro fluidic applications. It has significant advantages regarding dead volume, pressure tolerance, replaceability, scalability and dosage frequency in comparison to competing valve principles and other pinch valves. The transfer of the valve from laboratory sample to an industrial usage required particularly a modification of the tubes. A new geometry has to be developed and sufficient tube material has to be identified. Different silicone rubbers were examined in the course of prototype manufacturing. Preliminary investigations were carried out to qualify the manual manufacturing of the silicones, according to the manufactures specification. Based on these results, the new developed tubes were manufactured and compared to its technical properties. The required parameters were achieved by using heat-cured silicone elastomer. Preliminary dosage tests of the final developed pinch valve had shown good results and satisfy industrial specification.

CONTINUOUS CONTROL OF A SPRAYER PINCH VALVE

2000 ◽  
Vol 43 (4) ◽  
pp. 829-837 ◽  
Author(s):  
J. Kunavut ◽  
J. K. Schueller ◽  
P. A. C. Mason
Keyword(s):  
Continuous Control ◽  
Pinch Valve

Optimization of an Intermittent Slug Injection System for Sawdust Biomass Pyrolysis

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Federico M Berruti ◽  
Lorenzo Ferrante ◽  
Franco Berruti ◽  
Cedric Briens
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Feeding Tube ◽  
Operating Conditions ◽  
Injection System ◽  
Flow Rates ◽  
Pinch Valve ◽  
Mass Flow Rates ◽  
Biomass Materials

Among many other potential applications, intermittent solid slug feeders can be used to effectively inject biomass materials into fluidized bed reactors for pyrolysis. In particular, these feeders can be used to convey biomass materials that are highly cohesive to prevent plugging or undesirable reaction in the feeding tube. Although feeders of this design have been shown to work very effectively, they have not been studied in detail or optimized for the pyrolysis process. In addition, the operating conditions required to obtain predictable and consistent mass flow rates and slugs of desirable characteristics need to be established.The purpose of this work was to design, build and demonstrate the operation of a horizontal intermittent solid slug feeder and to test it with sawdust as the feed material. Sawdust is an extremely cohesive and difficult biomass to inject, but one that holds great potential as an important renewable feedstock for pyrolysis.The intermittent feeder designed for this work consisted of a pressurized vertical solids storage silo leading to a pneumatic pinch valve. The pinch valve, controlled by solenoid valves connected to a relay timer, released the feed into a horizontal feeding tube at a ninety degree angle. Within the silo, a rotating mixer prevented the bridging of solids. Intermittent pulses of gas from a control volume were fed into the horizontal feeding tube, as well as, in some cases, a continuous gas flow. The timing of the pulses was controlled by solenoid valves with a relay timer. While the pinch valve is opened, solids fall into the horizontal feeding tube forming a plug, which is then propelled by the pulsating gas into the reactor. The solid mass flow rate was experimentally measured by collecting the solids and continuously measuring the mass using a digital balance.Several variables were tested in order to optimize the performance of the feeder and the consistency of the feeding rate. They included the silo pressure, mixing rate, gas pulse pressure and volume, continuous gas mass flow rate, and the open pinch-valve time interval. The goals of this optimization were (a) to maximize the solid-to-gas ratio of mass flow rates, since the gas mass flux must be minimized to avoid wasting energy, and (b) to define operating conditions required to inject consistent biomass mass flow rates suitable for a laboratory scale pyrolysis reactor, and (c) to propose initial design criteria and a calibration procedure for intermittent solid slug feeders.The results demonstrated that the intermittent solid slug feeder system successfully achieved the desired objectives and showed how to efficiently select its optimum operating conditions.

A Novel Approach of Controlling Stoppage of Drip Infusion Using Image Processing on Raspberry PI Platform

2021 ◽  
Vol 58 (S) ◽  
pp. 65-72
Author(s):  
Hartono Pranjoto ◽  
Lanny Agustine ◽  
Diana Lestariningsih ◽  
Yesiana Dwi Wahyu Werdani ◽  
Widya Andyardja ◽  
...  
Keyword(s):  
Image Processing ◽  
Digital Camera ◽  
Detection Algorithm ◽  
Processing Technique ◽  
Image Processing Technique ◽  
Raspberry Pi ◽  
Novel Approach ◽  
Pinch Valve ◽  
Canny Edge ◽  
Infusion Fluid

Intravenous drip diffusion is a common practice to treat patients in hospitals. During treatment, nurses must check the condition of the infusion bag frequently before running out of fluid. This research proposes a novel method of checking the infusion bag using an image processing technique on a compact Raspberry PI platform. The infusion monitoring system proposed here is based solely on capturing the image of the infusion bag and the accompanying bag/ tube. When the infusion fluid enters the patient, the surface of the liquid will decrease, and at the end will reach the bottom of the infusion bag. When the image of the fluid surface touches the bottom of the infusion bag, a mechanism will trigger a relay, and then activate a pinch valve to stop the flow of the infusion fluid before it runs out. The entire system incorporates a digital camera and Raspberry as the image processor. The surface of the liquid is determined using the Canny Edge Detection algorithm, and its relative position in the tube is determined using the Hough Line Transform. The raw picture of the infusion bag and the processed image are then sent via a wireless network to become part of a larger system and can be monitored via a simple smartphone equipped with the proper application, thus becoming an Internet of Things (IoT). With this approach, nurses can carry on other tasks in caring for the patients while this system substitutes some work on checking the infusion fluid.

scholarly journals An air-operated pinch valve for chemostat outlet flow control

1972 ◽  
Vol 14 (6) ◽  
pp. 1045-1046 ◽  
Author(s):  
D. E. Brown ◽  
M. B. Inkson
Keyword(s):  
Flow Control ◽  
Pinch Valve ◽  
Outlet Flow

A Study on the Intelligent Bladder Irrigation Technology

2014 ◽  
Vol 551 ◽  
pp. 638-641
Author(s):  
Liang Han ◽  
Shi Chang Fu ◽  
Hui Hui Hong
Keyword(s):  
Urinary Tract Infection ◽  
Control System ◽  
Prevention And Control ◽  
Indwelling Catheter ◽  
Bladder Irrigation ◽  
Irrigation Technology ◽  
Pinch Valve ◽  
And Control ◽  
Infusion Tube

Bladder irrigation is one of the effective measures of prevention and control of urinary tract infection in patients with long-term indwelling catheter. Based on traditional artificial bladder irrigation technology, this paper presents a kind of intelligent bladder irrigator. The control system of this irrigator includes PLC and touch screen. The irrigator uses weighing sensor to monitor the weight of infusion bag in real time and controls pinch valve to switch the infusion tube. This paper has completed the design of the mechanical structure and control system. Intelligent bladder irrigator can realize the automation of traditional bladder irrigation.

AKO launches pinch valve

World Pumps ◽  
2006 ◽  
Vol 2006 (473) ◽  
pp. 10
Keyword(s):  
Pinch Valve
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