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Piezo Valve Actuators

Liquid hydrocarbon fuel dispensing piezo valve
Liquid Hydrocarbon Fuel Dispensing Microvalve

Dynamic Structures & Materials (DSM) works with companies to develop proportional valve products using piezo actuators. Interest has grown as product designers and managers learn how valves with proportional control capability can simplify and improve their systems, reduce cost, and improve system life.

DSM does not design valves, but has learned how to work closely with valve designers to create efficient and cost effective solutions to drive valves. Most applications require some actuator modification. However, as they are typically derivatives of our standard architectures, your project can be completed quickly with confidence in the outcome.

Our customer's confidential data is treated with extreme care. Much of what has been created over the years is proprietary and cannot be shown. A few examples are included below. Most of DSM's actuator architectures are compatible with valve driving conditions and can be considered for your valve applications.

Contact DSM today to speak to a sales representative or application engineer.

Possible Working Fluids

  • Liquid hydrocarbon fuels: butane, propane, etc.
  • Pressurized alcohol
  • Cryogenic fluids: liquid nitrogen, liquid oxygen, liquid methane
  • Compressed air
  • CO2
  • GN2
  • High temperature propellant gases

Applications

  • Fluid dispensing
  • Liquid fuel dispensing
  • Precision fluid metering
  • Factory automation
  • Proportional fluid control
  • High speed dispensing
  • High pressure dispensing
  • Pilot valve actuation

Valve Actuator Capabilities

Maximum Line Pressure: up to 1500 psi (10.3 MPa)

Environmental Temperature: -320 °F to 392 °F (-196 °C to 200 °C)

Operating Frequency: up to 1000 Hz

Samples of DSM's Work

Fuel Dispensing Piezo Valve

The microvalve pictured above is a miniature piezo-based valve for dispensing liquid hydrocarbon fuel. DSM's micro dispensing valve was designed for a consumer product end-use and provides a low cost piezo actuated valve at high production volume. This valve dispenses fluid at a frequency up to 100 Hz with a line pressure up to 10 psi (68.9 kPa). The valve interfaces with adhesive-mounted inlet and outlet tube fittings and overall dimensions of 0.5 in. x 0.67 in. x 0.28 in. (12.5 mm x 17 mm x 7 mm).

High Temperature Propellant Gas Valves

High temperature piezo gas valve actuator
Compact Profile, Small Form Factor, High Temperature Propellant Gas Valve

High temperature gas piezo valve actuator
High Temperature Propellant Gas Valve with 0.08 inches (2 mm) Travel

Sub-Millisecond Piezo Valve Actuator Used for Benchtop Ballistic Device

DSM provided an actuator to open and close a dispensing valve in less than 5 milliseconds. DSM's actuator provided the sub-millisecond pulse time and 4350 psi (30 MPa) pressure operation necessary for the Small-scale Ballistic Cavitation (SBC) device.

Researchers at the University of Illinois at Urbana-Champaign built an SBC device that models ballistic damage in soft materials without the disadvantages of traditional ballistic testing experiments. The researchers chose DSM's valve actuator because solenoid actuated devices did not have the necessary high frequency and operating pressure capabilities.

Device schematic for sub-millisecond piezo actuator used for benchtop testing
Device schematic (Milner and Hutchens, fig. 1a)

A Small-scale Ballistic Cavitation (SBC) technique is available from researchers at the University of Illinois at Urbana-Champaign. A piezo actuator that would open and close in less than 5 milliseconds was required to operate the SBC. The high-speed valve dispenses pulses of air from a high-pressure chamber (up to 30 MPa or 4,300 psi) into a soft material sample. A schematic of the device is shown above.

The air pulses form cavities inside the sample that replicate the effects of ballistic damage. The figure below shows the cavities formed in the soft material sample from two different pressure levels at 0, 2 and 7 milliseconds.

Cavity formation
Cavity formation (Milner and Hutchens, fig. 1b)

Researchers determined that a high-frequency piezo actuator was required to operate the valve. Solenoid actuated devices did not have the combination of sub-millisecond open/close times and ability to operate at pressure levels up to 30 MPa (Milner and Hutchens 72). The researchers at UIL Urbana-Champaign asked Dynamic Structures and Materials for an actuator to drive the benchtop testing drive. DSM coordinated with the researchers to design a custom solution. The high frequency piezo actuator, is shown in the figure below.

Custom high frequency piezo actuator and custom housing
Custom actuator and housing

The sub-millisecond pulse time supplied by DSM’s piezo actuator allowed the researchers to build a device that modeled ballistic damage without the disadvantages of traditional ballistic testing experiments.

SBC device (Milner and Hutchens, fig. 3c)

DSM’s high frequency piezo actuator (PSA) product pages have datasheets for actuators similar to the one used in this testing device. DSM has recommended applications listed on the PSA pages and can customize this actuator architecture for new applications.

For more information on the benchtop ballistic cavitation technique, check out the Extreme Mechanics Letters journal referenced below.

Reference

Milner, M. P. and Hutchens, S. B. “A benchtop ballistic cavitation technique,” Extreme Mechanics Letters 28 (2019) 69-75.

Cryogenic Isolation Valve Actuator

Using patented Flexframe Piezo Actuator technology, DSM designed and built a system that modulated flow in a smooth, voltage-controlled manner. The piezo valve actuator had minimal temperature sensitivity as Flexframe technology eliminates the need for bearings, bushings, or lubrication. This eliminates the possibility of binding as a result of thermal contraction/expansion discrepancies. The piezo valve actuator measured approximately 2.2 in. x 0.77 in. x 0.59 in. (56 mm x 20 mm x 15 mm), weighed less than 3 ounces (75 grams), and had over 0.012 in. (300 microns) of travel. Learn more about DSM's cryogenic and harsh environment capabilities on the Extreme Environment Devices page.

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