Valvula proporcional para aire

We found that even these simple demonstration valves are useful for many applications of air flow control. They can handle up to 75 psi, proportional control, much smaller (as you can see sitting next to this dime), and cost up to 1/10 of comparable electronic valves with the same characteristics.

Voltage (Standard Operation)**: .8 to .975 Volt

Current (Standard Operation)**: 750 mA

Resistance: 1.3 W

Ambient: »22°C

Size: 0.36”Ø x 1.75” Long

Connecting electrically: The brass ends of this valve are the electrical contacts. They are non polarized. Current can run either direction.

*The valve can be custom manufactured for higher psi if the application requires it.

*The valve can also be operated manually but should not be manually operated while being used

electrically.

*Wire is exposed internally. A wire break could cause a spark internally.

**Muscle wires™ (the “valve motor”) is based primarily on a thermal reaction. Therefore, the cycle

rate, and power to the valve can vary greatly depending on the goal of each different application.

This valve is designed to show how Muscle Wires™ can be used to proportionally control air flow. It uses a standard valve core or stem like those found in automobile tires. Generally, these stems are on or off depending on whether the internal stem cap is open or closed. Nevertheless, Muscle wires™ actuator wires can very gradually open or close these caps to produce proportionally controlled air flow. While heated with internal resistance (like a light bulb) the Muscle wires™ contracts and opens the cap; however, as it opens air begins to flow through and cool the same wire. The equilibrium between the electrical input and the mass of air entering the valve determines the aperture size and air flow. Consider the following test results showing how higher density of the pressurized input air restricts the output volume. :

Further testing also shows that with constant input pressure the output varies directly with current:

Air flow is controlled naturally. If airflow is restricted, a given current such as the 750mA above will

automatically open the valve further to maintain its equilibrium of energy input and air convection output.

For example, if being used to fill some sort of chamber (perhaps a car tire) a constant 750mA will open the valve more and permit more air flow as the pressures equalize, until it is completely open. This allows a kind of bleed on action but also lets the valve reach the fully open position and apply the full potential of the pressure available. Thus promoting a constant air flow.

Although tests with air flow show maximum flow rates and the current required to fully open the valve at a different input pressures, one must remember that at these amperages any decrease in air flow will overheat and destroy the valve itself.

Codigo: MiniValve  Precio: $15.