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  • BHO extractor closed loop

    BHO extractor closed loop

    Sells 1 lb, 10 lb, 20 lb, 50 lb and other closed-loop extractors, which are made of stainless steel, are inexpensive and have high extraction efficiency.

  • SPD2L short path distillation

    SPD2L short path distillation

    Sells a complete set of SPD-2L mini short-path distillation equipment, which is widely used in pharmaceutical, laboratory fractionation and purification, food and beverage, essential oil and other industries.

  • RE5299 rotary evaporator

    RE5299 rotary evaporator

    Our company's rotary evaporator RE-5299 rotary evaporator uses high borosilicate glass, with sufficient storage, cheap and good quality.

  • RE201D 301 501 rotary evaporator

    RE201D 301 501 rotary evaporator

    RE-201D RE-301 RE-501 rotary evaporator is a small rotary evaporator (mini rotary evaporator), beautiful appearance, small and light, top-rotating sealed, good vacuum.

  • S80L 100L glass jacketed reactor

    S80L 100L glass jacketed reactor

    Is specializes in manufacturing and selling laboratory large-capacity glass reactors. Double-layer glass reactors can be customized and processed according to customer needs. The design is unique, safe and convenient.

  • S10L 20L 30L 50L glass jacketed reactor

    S10L 20L 30L 50L glass jacketed reactor

    Is specializes in manufacturing and selling S-10L S-20L S-30L S-50L laboratory glass reactors, which can perform various solvent synthesis reactions under constant temperature conditions.

  • FD03H freeze dryer

    FD03H freeze dryer

    Home lab freeze dryer is a mini vacuum freeze dryer. We are a freeze dryer manufacturer in China. We sell freeze dryers, which are very suitable for home use.

  • DZF6500 vacuum drying oven

    DZF6500 vacuum drying oven

    The vacuum drying oven with vacuum pump can achieve the effect of vacuum drying.Provides vacuum drying ovens of various specifications.

  • KDM100 molecular distillation

    KDM100 molecular distillation

    A professional laboratory molecular distillation system manufacturer in China. Its evaporation efficiency is very high, it can reduce the retention time and has the smallest time delay.

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what are the parameters considered in selecting a high vacuum pump

Difficulties When Pumping High Viscosity Fluids - EDDY Pump

The Difficulty Pumping High Viscosity. For high viscosity fluids, centrifugal pumps are not ideal because of the close critical tolerances and lack of ability to mix thixotropic materials to provide a shear thinning effect. Without this thinning effect, the viscosity is not naturally reduced by the action of the pump, causing the pump to

Positive Displacement Pumps Selection Guide: Types

Pump Performance . When selecting positive displacement pumps, there are a few key performance specifiions to consider, namely flow rate, pressure, power, and efficiency. The details of these specifiions, along with their significance to pump selection, are described in Engineering360''s Pump Flow page. Pump Type

Selecting the right motor technology for miniature pumps

May 10, 2021· Dave Beckstoffer, Portescap, offers this guidance for selecting the right motor for a given pump appliion. Proper motor selection is critical to the efficient operation of miniature pumps in demanding flow or pressure/vacuum tasks. But with the spectrum of appliions covering a huge range of different price to performance needs, the design

The Fundamentals of High, Ultra & Extreme High Vacuum

The pressure range of XHV is usually defined as 10 -12 ar and lower, while UHV is between 10 -7 and 10 -12 ar, and HV between 10 -7 and 10-3 ar. XHV is associated with the levels found in outer-space in the form of geo-stationary orbiting satellites, UHV with high-energy physics and nuclear research, such as that being conducted at CERN

Vacuum Pump Capacity Ratings - Technical Data | Dekker

To be able to do this, we need to know the volumetric efficiency of the pump at a specific vacuum level (request this from the manufacturer), which can vary anywhere between 90% and 40%, depending on the pump design. For example, if a specific pump has a displacement of 100 CFM and the volumetric efficiency at 28" Hg gauge is 80%, the actual

Vacuum Pressure: What is it & how do you measure it?

Setra''s Vacuum Sensors; Vacuum Pressure. By definition, vacuum is a space that is partially exhausted (as to the highest degree possible) by artificial means (such as an air pump). This definition is referring to a high or hard vacuum. Figure 1 illustrates that relationship of absolute and gauge pressure with 0 PSIA equal to a high or hard vacuum.

Choosing between different types of vacuum pumps

Jun 25, 2019· 1. Vacuum level. The pump selection heavily depends on the level of vacuum that needs to be obtained. Typically, the different pressure ranges in vacuum technology are defined as follows: Rough vacuum (from 10 3 ar to 1 ar) Medium vacuum (1 ar to 10 -3 ar) High vacuum (10 -3 ar to 10 -7 ar) Ultra-high vacuum (10 -7 ar to 10 -12 ar)

Main parameters of vacuum pump- Vacuum Pump - EVP Vacuum

Nov 02, 2021· Main parameters of vacuum pump Vacuum pump is a kind of rotary variable capacity, vacuum pump must have a front-stage pump with a wide range of pressure can be used to have a greater pumping speed, the extracted gas contains dust and water vapor insensitive widely used in metallurgy, chemical industry, food, electronic coating and …

Understanding Vacuum and Vacuum Measurement

pressure in a chaer attached to a vacuum pump. The vacuum pump removes gas molecules from the chaer to reach the desired vacuum. Air at atmospheric pressure is a coination of gasses as shown in Table 1. The relative gas composition will be important later on in this paper. Gas molecules are always moving and colliding, molecule to molecule.

Scrubbers Selection Guide: Types, Features, Appliions

Scrubbers are air pollution control devices that use liquid to remove particulate matter or gases from an industrial exhaust or flue gas stream. This atomized liquid (typically water) entrains particles and pollutant gases in order to effectively wash them out of the gas flow. In comparison to other air pollution control devices, scrubbers are

Leak Checking Large Vacuum Chaers - Agilent

and cost-effective. The proper selection of a leak detector, the connection of the detector to the vacuum system, and the appropriate use of helium tracer gas are fundamental to a successful leak test. Typically, large vacuum chaers use a high vacuum pump (turbo or diffusion) backed by a roots-type blower and mechanical pump.

High-speed vacuum pipeline pumping system power

Nov 16, 2020· The main parameters of the vacuum pipeline pumping system for high-speed trains are considered. A mathematical model of the pumping system of a high-speed transport vacuum pipeline was developed. the power consumption, the influence of the periods of continuous operation of the vacuum pumping system, its size and pipeline material on the …

How to Select the Right Vacuum Pump - Labconco

Apr 05, 2016· Coination Vacuum Pumps, also known as Hybrid Vacuum Pumps, have both a Rotary Vane and Diaphragm pump together in the same vacuum pump. In a coination pump the diaphragm pump keeps the oil of the RV pump under negative pressure to reduce or eliminate vapors going through it and condensing in the oil. This design keeps the oil cleaner …

7 Best HVAC Vacuum Pumps Reviews: Value For Money Brands

Jul 16, 2021· Read Amazon Reviews. If you are a DIY repairman or homeowner and are looking for the best HVAC vacuum pump for the money, look no further. The FJC model 6909 uses 3 CFM to pull a vacuum on your AC system. The pump is designed for (and by) automotive experts, and will work great on most residential HVAC systems as well.

A Step-by-Step Approach to Pump Selection | Pumps & Systems

Sep 17, 2018· Thus, the details of the pump will start to emerge. 1. Before talking about a pump, consider the pipe. Velocity of liquid in pipes ranges between 3 to 10 feet per second (ft/sec). If the velocity is too slow, the dirt, sludge or other contaminants can settle. If flow is too fast, abrasive wear will reduce the life of the pipe.

Proper Selection and Use of Vacuum Gauges - Vacaero

Feb 14, 2019· Selecting the correct vacuum gauge or gauges is critical to the success of a heat treatment process. It is important to know how they work and what options are available so that the correct choice can be made. There are several important considerations when using a vacuum gauge. They include the method of operation, the gas composition (inert or reactive, …

High Vacuum Pumps Selection Guide: Types, Features

High Vacuum Pumps Information - GlobalSpec

vacuum pump sizing calculations- Vacuum Pump - EVP Vacuum

Feb 01, 2022· The selection of vacuum pump is mainly based on the pumping rate and the limit vacuum degree. It is not difficult to know that the limit vacuum degree is determined by the production process conditions. However, when selecting the vacuum pump, there is often a lack of data on its pumping capacity, which makes it helpless.

What to Consider in Gear Pump Selection | Pumps & Systems

Jul 28, 2020· 07/28/2020. Gear pumps are the most common type of positive displacement pumps, which are often used in pumping relatively high viscous fluid such as hydrocarbons, motor oil, liquid fuels and adhesives. For any rotodynamic pump, as viscosity goes up, pump performance diminishes due to increase in friction. But in the case of gear pumps, the

Sizing Vacuum Pumps - Thomasnet

Assuming a vacuum pump and standard refrigeration circuit, connected by means of quick release couplers and vacuum hoses to a tube 40 cm long x 1 cm in diameter, the conductance is considered to be 1 ar. The conductance is calculated from the Viscous or Laminar Flow formula, by adding the coefficient 3.6 the units l/s are converted to m3/h x m h

Understanding Key Process Parameters of Vacuum …

Vacuum aluminum brazing (VAB) is per-formed in a vacuum furnace and is considered fluxless brazing because flux is not used to cre-ate joints. Fluxless brazing processes can be performed using inert gas atmospheres or in vacuum furnaces. Appliion examples in-clude semiconductor manufacturing and ce-ramic to copper brazing. Due to the vacuum’s

Fundamentals of Vacuum | Power & Motion

Jan 01, 2012· Vacuum pump selection. The first major step in selecting the right vacuum pump is to compare appliion vacuum requirements with the maximum vacuum ratings of commercial pumps. At low levels, there is a wide choice of pumps. But as vacuum level increases, the choice narrows, sometimes to the point where only one type of pump may be …

7 Essential Variables For Pump Selection - Crane …

Below are process liquid properties that must be considered before selecting a pump. Liquid viscosity Temperature Specific gravity Vapor pressure Solids present & concentration Shear sensitive Abrasive or Non-abrasive 2. Materials of Construction

Vacuum pumps - Machine Design

Nov 15, 2002· The design is available in both one and two-stage versions. Single-stage pumps provide vacuum up to 25.5 in. Hg, while two-stage units are rated to 29 in. Hg. Rocking-piston pumps coine the

Condenser Backpressure High? Check Vacuum System Sizing

Feb 01, 2012· Units conversion: Convert standard cubic meters to pump test suction conditions of 33.9 ar pressure and 20C: 107.49 x (1,013/33.9) x (293/273) x (1/60) = 57.455 m 3 /min. Note: 33.9 ar = 1

[HOW TO] Select Required Vacuum Pump Capacity - Pharma

Dear Pratim, As per my theory, the time parameter will remain same during scaleup, but as per practical experience the time parameter will automatically vary from standard, so the drying time will remain same, but where as the filtration time will vary based on equipment selection, if Filter press is considered for filtration the rate of filtration will be high, if ANFD is considered the

How To Choose The Right Vacuum Pump - …

A two stage design has two rotors and vanes. This means that the first stage generates vacuum and the second stage cleans the system, leading to a deeper ultimate vacuum level. As a result, two stage pumps can produce a deeper …

High-speed vacuum pipeline pumping system power

Nov 16, 2020· The main parameters of the vacuum pipeline pumping system for high-speed trains are considered. A mathematical model of the pumping system of a high-speed transport vacuum pipeline was developed. the power consumption, the influence of the periods of continuous operation of the vacuum pumping system, its size and pipeline material on the …

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