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Vacuum Components and Control
Vacuum Products Canada Inc. supplies a wide range of vacuum fittings, feedthroughs, valves, measurement and control systems. If you need smart vacuum sensors, displays or gas dosing systems, we can help you build a control system that suits your needs. Whether fully automated digital or analog, we have the system that is right for you. Total Pressure GaugesToday, the total range of vacuum pressure accessible to measurement extends from atmospheric pressure (about 1000 mbar (750 Torr)) down to 10-12 mbar/Torr, i.e. it extends over 15 powers of ten. The instruments used for measuring the pressure within this wide range are called vacuum gauges. For physical reasons it is not possible to create a single vacuum technology through which it might be possible to perform quantitative measurements within the entire pressure range. Therefore, a variety of different vacuum gauges are available, each with their own characteristic measurement range which commonly extends over several powers of ten. A distinction is made between direct and indirect pressure measurements. In the case of direct (or absolute) pressure measurements, the readings obtained through the vacuum gauge are independent of the type of gas and the pressure which is to be measured. Mechanical vacuum gauges are those where the pressure is determined directly by recording the force acting on the surface of a diaphragm. In the case of indirect pressure measurements the pressure is determined as a function of a pressure dependant property of the gas (thermal conductivity, ionization probability, for example). These properties do not only depend on the pressure, but also on the molar mass of the gases. For this reason, the pressure readings obtained through vacuum gauges which rely on indirect pressure measurements, depend on the type of gas. The readings usually relate to air or nitrogen as the measurement gas. For the measurement of other vapors or gases the corresponding correction factors must be applied. ValvesWe select and design valves and vacuum protection components for a wide variety of applications. The range of products is such that a reliable solution can be offered for every vacuum engineering application. Many years of service and the reliability of the valves is ensured by design. Oerlikon Leybold vacuum valves are well-proven in many widely varying areas of research and industry. Scope of the Range of Valves The range of Oerlikon Leybold Vacuum valves includes:
All valves are available with different driving systems. With the exception of the special valves you may select between a stepped rotary knob manual drive, an electro pneumatic drive or an electro-magnetic drive system. Right-angle valves DN 16 ISO-KF to We offer short switching cycles (e.g. 1.5 s) and a very high number of opening and switching cycles (e.g. over 10 million cycles), high conductance (similar to the corresponding flange components, like bends, for example), high integral leak tightness for the valves (leak rates below 10-9 mbar l/s) and materials capable of resisting radiation, high temperatures and corrosion at the same time. Our valves are designed for quiet opening action with very little vibration, are compact in design, with low weight and highly visible, unambiguous position indicators. Fittings, Feedthroughs and ComponentsVacuum systems (i.e. systems for pressures ranging from 2.5 bar to 10-9 mbar (1.9 x 10-3 Torr to 0.75 x 10-9 Torr)) are quickly and easily assembled owing to the modular construction principle which is based on interchangeable standard components by means of vacuum-tight, demountable flange connections. Individual components may be exchanged easily at any time. Depending on the intended use and size of the connection, flanges of different types have been developed. The KF flange connection was developed by Oerlikon Leybold Vacuum many years ago and has been widely accepted by all users of vacuum equipment. This product section lists all flange connections and fittings including adaptors for ultra-high vacuum components. Components marked with [< 1000 mbar (< 750 Torr)] are not allowed for use at pressures exceeding 1000 mbar abs. The components and flange connections are intended for use in connection with vacuum systems. They have not been designed to support mechanical loads. All loads must be supported separately at the connection components. High-Vacuum ComponentsAccording to DIN 28 400, the term “Ultra-high Vacuum (UHV)” designates the pressure range below 10-7 mbar. Several physical quantities, such as mean free path, monolayer time, flow density of the particles impinging on the walls, leak rate and the degassing rate are of significance in the characterization of this pressure range. In order to attain or maintain pressures below 10-7 mbar, the vapour pressure of the pump fluid or lubricant should be in accordance with the desired ultimate pressure and the leak and degassing rates of the entire apparatus must be extremely low. Generally, both leak rate and backstreaming effects through the pump can be kept at sufficiently low levels by using suitable UHV sealing materials and pumps. Advantages to the User
A sufficiently low outgassing rate can only be achieved by baking out the entire apparatus at temperatures of about 300 °C for a long period of time. It is only under these conditions that the mono-layers of atoms or molecules, which attach quite firmly to the surfaces of the vacuum apparatus including its installations, are desorbed. Consequently, components for UHV systems are generally made of stainless steel. Metal gaskets, ceramic feedthroughs and bakeable observation windows are used exclusively. For applications in the extreme UHV range (XHV) the outgassing rate of the CF flanges and the UHV components can be reduced by about two orders of magnitude by a special degassing process. The high standard of development and manufacture combined with the use of high quality materials guarantee that UHV components from Oerlikon Leybold Vacuum are able to meet even the most demanding requirements. |
Vacuum Products Canada Inc. www.vpcinc.ca
1-800-269-6030 reachus@vpcinc.ca |
