Everything you should know before
They determine the dynamics of a system and have to withstand even the highest dynamic demands. Therefore, when purchasing such key components, it is important to ensure that they are optimally adapted to the application, the particular medium and the particular environment. This is the only way to achieve a high level of safety, reliability and longevity for your applications and products. As a rule, "off the peg" solutions can not meet the massively increased demands on reliability and stability.
A microvalve is a particularly small component for regulating or shutting off the flow of gases or fluids. To make this possible, a closure element (e.g. a disc, a ball or a cone) is usually moved almost parallel to the flow direction of a fluid. By pressing the entire closure element onto the appropriate opening, the flow is either reduced or discontinued.
There are innumerable valve designs and variants and they in part fulfil completely different functions. In order to get an overview of the confusing product landscape, different segments for the categorization and differentiation of valves were defined.
Since microvalves in hydraulic or pneumatic systems are given a wide variety of tasks, a distinction can be made according to the specific tasks of the valves.
Switch valves or stop valves control the flow of a fluid by either blocking or opening the fluid channel. In case of microvalves, which withstand a high switching frequency, quasi-proportional regulation of the fluid can nevertheless be achieved by lightning-fast switching.
With flow control valves or proportional valves, the flow in the fluid channel can only be partially opened or closed, depending on the applied voltage (current). Gases or fluids thus can be precisely metered externally.
Microvalves can be differentiated by the number of connections per switching position and the number of switching positions. For example, a 2/2-way valve has two ports (A, P) and two switching positions (closed, open).
At rest, the leaf spring presses the seal into the lower end position. The medium can flow from P to A. After switching on the solenoid, the plunger is pulled into position. The seal is pressed against the valve seat, the valve is closed.
At rest, the leaf spring presses the seal against the lower valve seat. The valve is closed, A can vent to R. After switching on the solenoid, the plunger is pulled into position. The seal is pressed against the upper valve seat. The valve is open and the medium can flow from P to A.
At rest, the leaf spring presses the seal against the lower valve seat. The medium can flow from P to A. After switching on the solenoid, the plunger is pulled into position. The seal is pressed against the upper valve seat. The valve is closed, A can vent to R.
At rest, the leaf spring presses the disc armature with integrated sealing element against the valve seat P. The outlet A is connected to R. After switching on the solenoid, the disc armature is pulled into position and closes venting R. The connection from P to A is open. The medium flows around the armature. After switching off the solenoid, the leaf spring pushes the disc armature back to the rest position, the valve is closed.
|Directional valve with two switch positions
|Directional valve with three switch positions
|Directional valve with three switch positions and four connections
|Directional valve with intermediate positions and two end positions, also proportional valve
|A flow path
|Two blocked connections
|Two flow paths
|2/2 way valve
|2/3 way valve
Before you get involved in the procurement of microvalves, you should look at the basic concepts in this context. Our compact glossary gives you a good overview.Just click on the term you want to know more about.
Now that you have informed yourself about the facts and basic properties of microvalves, we look forward to your enquiry! We gladly discuss anything else with you in a personal conversation.