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diffusion vacuum pumps

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Spectacle frames coating machine(JTL-1110)

Model / Specifications:JTL-series

Details: Spectacle frames coating machine has high-vacuum diffusion pumps, roots pump, sliding valve pumps or rotary pu...

Huicheng Vacuum Technology Co., Ltd.

Business Type:Manufacturers

Free Member

China (Mainland)China (Mainland)

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Rotary Vacuum Pump (SV-100)

Minimum Order:1 Pieces

Productivity:3000PCS/Year

Origin:China

Export Markets:North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe

Details:

Taizhou Ranri Import & Export Co., Ltd.

Business Type:

Free Member

ChinaChina

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Rotary Vacuum Pump (2XZ-2)

Productivity:3000PCS/Year

Trademark:EVP

Export Markets:North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe

HS Code:84141000

Details:

Taizhou Ranri Import & Export Co., Ltd.

Business Type:

Free Member

ChinaChina

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Magnetron Sputter And Evaporation Vacuum Plating Machine

Model / Specifications:Magnetron Sputter And Evaporation...

Details: Magnetron Sputter And Evaporation Plating Machine Our machines include these parts: 1. Working chamber(size: customized)2. High vacuum pumping sy...

Hongfeng Mechanical Equipment Manufactory

Business Type:Manufacturers

Free Member

China (Mainland)China (Mainland)

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Diffusion Pumps

Brand Name:goldstone

Usage:Oil

Power:Hydraulic

Details: Technical Specification: DN=300mm Ultimate Vacuum = 7 X 10-5Pa...

Sichuan Goldstone Orient New Material Equipment Co., Ltd.

Business Type:Manufacturers

Free Member

China (Mainland)China (Mainland)

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Product Summary

Diffusion vacuum pumps were the first high vacuum pumps in operation. It is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum.

Diffusion vacuum pumps operate by boiling a low vapor pressure, high molecular weight, nonreactive fluid and forcing a dense vapor stream up a central column and out as a conical vapor curtain, through jets that are angled downward. Gas molecules from the chamber randomly enter the curtain and are pushed toward the boiler by momentum transfer from the fluid molecules. When the vapor curtain reaches the cold wall, the temperature change of perhaps 200–250o C immediately returns it to liquid form at a low vapor pressure.

Diffusion vacuum pumps tolerate operating conditions (e.g., excess particles or reactive gases) that would destroy other high vacuum pumps. They have high pumping speeds for a relatively low cost, and are vibration and noise free. Unfortunately, they continuously back stream oil vapor and instantly turn a simple operating error into a major system disaster with oil everywhere. For this reason, diffusion vacuum pumps have decreased in popularity but are still seen in applications requiring huge pumping speeds such as molecular beam systems, large scale vacuum furnace processing, and space simulation chambers.

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