Parkwalk Advisors

Proxisense specializes in developing proximity sensors and fluid contamination monitoring systems using eddy current technology. Their real-time turbine blade health monitoring systems extend component lifetimes and reduce maintenance costs, targeting the power and aerospace industries. They also provide reliable fluid monitoring to prevent damage and optimize operating conditions for transportation assets.

LettUs Grow develops aeroponic irrigation and farm management technology for greenhouse and vertical farming. The company designs modular, nozzle-free aeroponic systems that deliver nutrient mist to plant roots and are paired with automated control software to optimize conditions for individual species, while enabling pesticide-free operation. Its hardware and software aim to reduce labor, improve efficiency, and lower costs, with environmental benefits such as reduced waste and carbon footprint. Founded in 2015 and based in Bristol, United Kingdom, LettUs Grow markets solutions that support sustainable indoor farming.

Oxford Flow designs, manufactures, and supplies pressure control equipment, including gas and fluid pressure regulators, water PRVs, silencers, and pilots, serving water, gas, marine, oil and gas, process, power, building services, and specialty applications. The company develops small, light, and reliable conventional valves that simplify systems and ensure continual potable water supplies while meeting standards for water quality and leakage control. It combines academic and industry expertise to develop practical, rigorously tested solutions that perform under harsh conditions, aiming to reduce total cost of ownership and environmental impact while improving reliability and energy efficiency. Based in Oxford, United Kingdom.

Flusso Ltd, established in 2016 and headquartered in Cambridge, United Kingdom, specializes in the development and manufacturing of sensor solutions tailored to various industries. The company produces mass flow and air velocity sensors, leveraging proprietary technology to meet specific application needs.

LettUs Grow develops aeroponic irrigation and farm management technology for greenhouse and vertical farming. The company designs modular, nozzle-free aeroponic systems that deliver nutrient mist to plant roots and are paired with automated control software to optimize conditions for individual species, while enabling pesticide-free operation. Its hardware and software aim to reduce labor, improve efficiency, and lower costs, with environmental benefits such as reduced waste and carbon footprint. Founded in 2015 and based in Bristol, United Kingdom, LettUs Grow markets solutions that support sustainable indoor farming.

Inductosense is a technology company developing wireless, battery-free sensors that can be permanently attached to structures or products to enable fast, repeatable inspections for cracks, corrosion, and other defects. Its Wireless And Non Destructive (WAND) system uses passive sensors that are powered and read non-contact via inductive coupling from a handheld probe, allowing sensing under coatings, insulation, or repairs and even embedding within materials. The company offers easy-to-install sensors, measurement probes, and data collection or remote monitoring capabilities to monitor internal corrosion and erosion in pipes and vessels at elevated temperatures. Applications include inspection of large structures, composites repair, remote monitoring, and under coatings. Founded in 2015 and based in Bristol, the United Kingdom, the company aims to improve inspection efficiency, reduce costs, and enhance safety by enabling long-term, non-destructive evaluation through continuous monitoring.

Perpetuum Ltd. is a company based in Southampton, United Kingdom, that specializes in the engineering, manufacturing, and commercialization of electromagnetic vibration harvesting micro generators. Founded in 2004 as a technology spin-off from the University of Southampton, Perpetuum has developed innovative self-powered wireless sensor solutions designed for condition monitoring in various industries, including rail, oil and gas, chemicals, and power generation. Its flagship products convert mechanical vibration into electrical energy, allowing for the operation of autonomous, maintenance-free wireless sensor nodes that transmit critical data on equipment health and performance. Perpetuum is recognized as the global leader in vibration energy harvesting, continually advancing the practical applications of this technology to enhance operational efficiency and safety in industrial environments.

Flusso Ltd, established in 2016 and headquartered in Cambridge, United Kingdom, specializes in the development and manufacturing of sensor solutions tailored to various industries. The company produces mass flow and air velocity sensors, leveraging proprietary technology to meet specific application needs.

Proxisense specializes in developing proximity sensors and fluid contamination monitoring systems using eddy current technology. Their real-time turbine blade health monitoring systems extend component lifetimes and reduce maintenance costs, targeting the power and aerospace industries. They also provide reliable fluid monitoring to prevent damage and optimize operating conditions for transportation assets.

Salunda develops robust contactless sensors for use in harsh environments. Its technology detects position and speed and measures fluid composition, enabling inline water cut and multiphase flow sensing for oil, water, and gas fractions, as well as downhole inspection tools and BHA sensors to detect wear and potential failure. The sensors scan components such as pistons, rotors and seals for wear, and can warn of imminent issues by identifying cracks, eccentric motion, orbiting, axial shift, or vibration. The system includes oilfield tooling, production and test separator level sensing in the presence of bubbles and froth, and handheld testers for detecting biofuel in diesel. The company also supplies sensor probes and electronics that measure fluid levels and monitor froth and entrained gases, with self-compensation for changing fluid characteristics and temperature. OEM components support open-bore water cut and multiphase flow applications, and the technology is suitable for intrinsic safety and offshore environments.

Oxford Flow designs, manufactures, and supplies pressure control equipment, including gas and fluid pressure regulators, water PRVs, silencers, and pilots, serving water, gas, marine, oil and gas, process, power, building services, and specialty applications. The company develops small, light, and reliable conventional valves that simplify systems and ensure continual potable water supplies while meeting standards for water quality and leakage control. It combines academic and industry expertise to develop practical, rigorously tested solutions that perform under harsh conditions, aiming to reduce total cost of ownership and environmental impact while improving reliability and energy efficiency. Based in Oxford, United Kingdom.

Ionix Advanced Technologies designs and manufactures high-temperature piezoelectric devices and materials, offering sensors, actuators and transducers based on novel high-temperature piezoelectric materials and anisotropic ceramics to reduce ultrasonic crosstalk and improve acoustic transmission. It serves industrial processes in aerospace, oil and gas, nuclear power, automotive, and ultrasound and nondestructive testing markets, focusing on high-performance systems that operate reliably in extreme environments, including high temperatures and radiation. The company enables continuous monitoring and safer, more efficient operation of equipment. Founded in 2011 and based in Leeds, United Kingdom.

Inductosense is a technology company developing wireless, battery-free sensors that can be permanently attached to structures or products to enable fast, repeatable inspections for cracks, corrosion, and other defects. Its Wireless And Non Destructive (WAND) system uses passive sensors that are powered and read non-contact via inductive coupling from a handheld probe, allowing sensing under coatings, insulation, or repairs and even embedding within materials. The company offers easy-to-install sensors, measurement probes, and data collection or remote monitoring capabilities to monitor internal corrosion and erosion in pipes and vessels at elevated temperatures. Applications include inspection of large structures, composites repair, remote monitoring, and under coatings. Founded in 2015 and based in Bristol, the United Kingdom, the company aims to improve inspection efficiency, reduce costs, and enhance safety by enabling long-term, non-destructive evaluation through continuous monitoring.

Proxisense specializes in developing proximity sensors and fluid contamination monitoring systems using eddy current technology. Their real-time turbine blade health monitoring systems extend component lifetimes and reduce maintenance costs, targeting the power and aerospace industries. They also provide reliable fluid monitoring to prevent damage and optimize operating conditions for transportation assets.

Salunda develops robust contactless sensors for use in harsh environments. Its technology detects position and speed and measures fluid composition, enabling inline water cut and multiphase flow sensing for oil, water, and gas fractions, as well as downhole inspection tools and BHA sensors to detect wear and potential failure. The sensors scan components such as pistons, rotors and seals for wear, and can warn of imminent issues by identifying cracks, eccentric motion, orbiting, axial shift, or vibration. The system includes oilfield tooling, production and test separator level sensing in the presence of bubbles and froth, and handheld testers for detecting biofuel in diesel. The company also supplies sensor probes and electronics that measure fluid levels and monitor froth and entrained gases, with self-compensation for changing fluid characteristics and temperature. OEM components support open-bore water cut and multiphase flow applications, and the technology is suitable for intrinsic safety and offshore environments.

Ionix Advanced Technologies designs and manufactures high-temperature piezoelectric devices and materials, offering sensors, actuators and transducers based on novel high-temperature piezoelectric materials and anisotropic ceramics to reduce ultrasonic crosstalk and improve acoustic transmission. It serves industrial processes in aerospace, oil and gas, nuclear power, automotive, and ultrasound and nondestructive testing markets, focusing on high-performance systems that operate reliably in extreme environments, including high temperatures and radiation. The company enables continuous monitoring and safer, more efficient operation of equipment. Founded in 2011 and based in Leeds, United Kingdom.

Salunda develops robust contactless sensors for use in harsh environments. Its technology detects position and speed and measures fluid composition, enabling inline water cut and multiphase flow sensing for oil, water, and gas fractions, as well as downhole inspection tools and BHA sensors to detect wear and potential failure. The sensors scan components such as pistons, rotors and seals for wear, and can warn of imminent issues by identifying cracks, eccentric motion, orbiting, axial shift, or vibration. The system includes oilfield tooling, production and test separator level sensing in the presence of bubbles and froth, and handheld testers for detecting biofuel in diesel. The company also supplies sensor probes and electronics that measure fluid levels and monitor froth and entrained gases, with self-compensation for changing fluid characteristics and temperature. OEM components support open-bore water cut and multiphase flow applications, and the technology is suitable for intrinsic safety and offshore environments.

Perpetuum Ltd. is a company based in Southampton, United Kingdom, that specializes in the engineering, manufacturing, and commercialization of electromagnetic vibration harvesting micro generators. Founded in 2004 as a technology spin-off from the University of Southampton, Perpetuum has developed innovative self-powered wireless sensor solutions designed for condition monitoring in various industries, including rail, oil and gas, chemicals, and power generation. Its flagship products convert mechanical vibration into electrical energy, allowing for the operation of autonomous, maintenance-free wireless sensor nodes that transmit critical data on equipment health and performance. Perpetuum is recognized as the global leader in vibration energy harvesting, continually advancing the practical applications of this technology to enhance operational efficiency and safety in industrial environments.

Clean Air Power Inc., established in 1991 and headquartered in Poway, California, designs, develops, and delivers engine systems that enable heavy-duty diesel engines to run primarily on natural gas, mixed with a small quantity of diesel for ignition. The company offers Dual-Fuel systems for commercial vehicle operators and MicroPilot, a second-generation natural gas engine technology for heavy-duty trucks. Additionally, they provide hydraulic and gas engine components, as well as emissions control technologies. Clean Air Power operates as a subsidiary of Clean Air Power Limited, with an additional location in Leyland, United Kingdom.

Clean Air Power Inc., established in 1991 and headquartered in Poway, California, designs, develops, and delivers engine systems that enable heavy-duty diesel engines to run primarily on natural gas, mixed with a small quantity of diesel for ignition. The company offers Dual-Fuel systems for commercial vehicle operators and MicroPilot, a second-generation natural gas engine technology for heavy-duty trucks. Additionally, they provide hydraulic and gas engine components, as well as emissions control technologies. Clean Air Power operates as a subsidiary of Clean Air Power Limited, with an additional location in Leyland, United Kingdom.

Clean Air Power Inc., established in 1991 and headquartered in Poway, California, designs, develops, and delivers engine systems that enable heavy-duty diesel engines to run primarily on natural gas, mixed with a small quantity of diesel for ignition. The company offers Dual-Fuel systems for commercial vehicle operators and MicroPilot, a second-generation natural gas engine technology for heavy-duty trucks. Additionally, they provide hydraulic and gas engine components, as well as emissions control technologies. Clean Air Power operates as a subsidiary of Clean Air Power Limited, with an additional location in Leyland, United Kingdom.

Itaconix designs and manufactures bio-based polymers used in home care, personal care, industrial, and other applications. Its products are derived from itaconic acid, offering safety, performance, and sustainability advantages.

Itaconix designs and manufactures bio-based polymers used in home care, personal care, industrial, and other applications. Its products are derived from itaconic acid, offering safety, performance, and sustainability advantages.