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The principle of piezoelectric valves
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Release time:
2021-12-30
A piezoelectric valve is a two-position (or proportional) control valve that operates on the principle of bending deformation of functional ceramic plates under voltage. It requires only a sufficient voltage to actuate the piezoelectric valve, with virtually zero power consumption. In electrical-to-pressure conversion devices, the piezoelectric valve serves as a pilot valve. Each E/P conversion unit employs two piezoelectric valves simultaneously. Since the pilot pressure generated by the piezoelectric valve—i.e., the air pressure within the pilot chamber—is too low, it is necessary to increase this pressure.
A piezoelectric valve is a two-position (or proportional) control valve that operates on the principle of bending deformation of functional ceramic plates under voltage. It requires only a sufficient voltage to actuate the piezoelectric valve, with virtually zero power consumption. In electrical-to-pressure conversion devices, the piezoelectric valve serves as a pilot valve. Each E/P conversion unit employs two piezoelectric valves simultaneously. Since the pilot pressure of the piezoelectric valve—i.e., the air pressure in the pilot chamber—is too low, it is necessary to increase the pressure.
Pressurization is achieved in the servo section, which functions like a pneumatic relay. The servo section features a larger-area diaphragm on the pilot chamber side and a smaller-area surface on the output and exhaust chamber side. When the pilot pressure reaches 120 kPa, the force acting on the diaphragm on the pilot chamber side exceeds the force acting on the opposite side—the output and exhaust chambers—thus forcing the moving spool and the exhaust spool to shift. Once the forces on both sides reach equilibrium, the air pressure acting on the output and exhaust chamber side becomes greater than the pilot pressure, thereby achieving the purpose of pressurization. Working principle: In the initial state of the piezoelectric valve (with no power applied), the functional ceramic plate exerts pressure on nozzle opening 1. At this point, port 2, nozzle opening 3, and the guide chamber are interconnected to form a single unit. When the piezoelectric valve is energized, the functional ceramic plate deforms upward, compressing nozzle opening 3 and connecting port 2 to nozzle opening 1.
The term “piezoelectric valve” is merely a generic label. Piezoelectric jet valves and piezoelectric dispensing machines can both be considered piezoelectric valves. Some customers, when purchasing piezoelectric jet valves, compare them with pneumatic jet valves for dispensing applications. Which piezoelectric valve is better? And how do you actually make your selection when you’re putting the valve into real-world dispensing applications?
Comparison between Piezoelectric and Pneumatic Jet Valves for Dispensing Adhesive:
1. The piezoelectric jet valve is a non-contact dispensing valve whose operating frequency can reach 2000 Hz, with an instantaneous maximum frequency of up to 3300 Hz. In the absence of external air pressure, it offers even higher dispensing accuracy.
2. The pneumatic jet valve is a non-contact dispensing device with an operating frequency of up to 200 Hz per second. It requires external air pressure to assist in the dispensing process and offers high dispensing accuracy.
These two valve models are compatible with a wide variety of adhesive types and can handle adhesives of different viscosities. Both valves feature a heating function at the base of the needle tip, which effectively enhances the fluidity of the adhesive. The smallest aperture of their needle tips is 0.075 mm. They offer a diverse range of plunger models, making them suitable for adhesives with varying viscosities and colors. They are easy to operate and simple to clean and maintain.
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