Swiss VAT vacuum gate valve domestic spot supply - VAT valve seller

Swiss VAT vacuum gate valve domestic spot supply - VAT valve seller

Characteristics and applications of different types of valves:

Vacuum gate valve - typically an ideal choice for isolation or simpler control applications. The installation depth is very narrow, with the highest conductivity (minimum flow resistance), but the travel space of the gate is required. These can also take the form of vacuum slit valves, vacuum transfer valves, or vacuum doors, through which the product is introduced into the vacuum process chamber.

Vacuum angle valve - a general-purpose vacuum valve. The size is very compact, usually very modular in terms of sealing, actuators, and sensors. The average conductivity is very easy to maintain. Very good, with very precise controllability if needed.

Vacuum butterfly valve - mainly used for control applications. Very narrow installation depth, good conductivity, fast and precise controllability.

Vacuum swing valve - very narrow installation depth and compact size, combined with very precise control behavior, excellent insulation ability, and very high conductivity.

Symmetrical flow vacuum regulating valve - a special type that optimizes the very uniform flow behavior from the first opening to the entire valve opening.

Gas metering valve or leak valve - especially for very fine metering, such as metering low flow process gases.

Pressure relief valve or exhaust valve - A safety valve allows the vacuum system to be controlled, typically for ventilation, and prevents exceeding specified pressure conditions.

Vacuum check valve - a passive, volumetric flow and differential pressure operated valve. Usually used to protect vacuum systems from backflow contamination. For example, used between vacuum reflux pumps and vacuum systems.

Quick closing valve - an active protective valve that typically protects larger vacuum volumes or chambers from vacuum loss due to leakage. Main feature: It has a very fast closing response to detected pressure drops. In UHV and XHV applications, it is typically supported by sector vacuum valves (usually vacuum gate valves) to ensure sealed isolation even under very high pressure differentials.

Vacuum all metal valve - a set of vacuum valves designed specifically for pressure, temperature, and radiation conditions. Main features: Hard to hard (metal to metal) sealing, rather than elastic sealing, as elastic sealing cannot withstand service conditions.

Vacuum multi valve device - a special type of vacuum valve that combines the functions of several vacuum valves into one unit. Main features: reduced number of components and fast assembly speed. Usually customized according to customer requirements.

Three position vacuum valve - a special form of vacuum isolation valve, in which a third valve position can be defined in addition to the closed and open positions. For example, one application is to avoid pressure pulses caused by valves opening too quickly under high pressure differentials. In the third position, the contact pressure on the sealing ring slightly decreases in a short period of time, while the valve does not open significantly, making the pressure change more stable.

In addition to these basic types, there are also a large number of hybrid variants, some of which combine different valve technologies or provide solutions for certain special requirements.

What is a high-performance vacuum valve?

The vacuum valves in these applications differ from standard vacuum valves in the following aspects:

Minimizing particle emissions

High performance vacuum valves are optimized to not release particles through the material of their housing, mechanical devices, or seals, nor through the friction of their opening, closing, or controlling motion. This is achieved through special selection and handling of the materials used, as well as through certain design details that can minimize or in some cases eliminate the release of particles.

Minimized motion pulse

Each valve generates motion pulses through its opening and closing movements. In the case of automatically driving valves, the range of these pulses can range from slight vibrations to hard impacts that can be heard and perceived. These motion pulses may have a negative impact on sensitive manufacturing processes, such as through the release of additional particles. In addition to design features, high-performance vacuum valves mainly reduce these pulses by controlling the so-called motion curve. Similar to the operation of passenger elevators, the closing speed will slow down shortly before reaching the closing point to prevent 'impact'. These motion curves can usually be modified, for example, in terms of closing time and closing frequency, they can adapt to the required conditions.

Neutral Chemistry and Physical Behavior

The vacuum valve always changes the uniformity of the vacuum process chamber, regardless of its form. The occurrence of this situation is partly due to the result of its geometric shape. The narrowing or widening of the flow path can change the flow resistance and flow velocity, or blind spots such as the movement space of the valve plate, which can promote the sedimentation process. This also occurs through opening and closing movements, which alter the flow behavior as well as the concentration, distribution, mixing, and temperature of the process gas. High performance vacuum valves are optimized to compensate for this effect as much as possible or make it controllable. To this end, various additional technologies have been incorporated into the design, which go far beyond the basic functions of the valve, such as opening and closing or control.

Accurate and reproducible behavior

The main difference between high-performance vacuum valves and standard solutions lies in their highly reproducible behavior. This means that although standard solutions exhibit fluctuations in each individual opening and closing motion and show deviations from their defined performance values during use, high-performance vacuum valves are optimized to consistently exhibit the same behavior over long periods of use, defined within a very narrow range. This means that they can stabilize the vacuum process and reduce the complexity of process control to Zuidi.

What are the types of vacuum valves?

Like other valves, vacuum valves use basic mechanical principles such as gate valves, baffle discs, or rotating discs to separate or isolate vacuum zones and control volumetric flow. However, the basic conditions for using these mechanical principles are different. For example, high degree of freedom particles, precise control of very small volume flow, sealing, minimal vibration and impact are crucial characteristics. Therefore, these basic mechanical devices are usually designed differently for vacuum valves. For example, closing mechanisms are typically designed to close frictionlessly and cause minimal vibration and impact, if any. In addition, controlling the movement can be extremely precise in dosage, with optimized sealing to ensure that no particles are released under ideal conditions, and its static or dynamic characteristics remain stable over long-term use.

Swiss VAT vacuum gate valve domestic spot supply - VAT valve seller