Aerospace Projects
Aircraft Servo Valve Nulling Rigs
GRN Systems engineers collaborated with a leading aerospace manufacturer to develop specialised test rigs designed for hydraulic servo valve testing.
The unit under test (UUT) is a hydraulic servo valve used in commercial aircraft.
These valves control the actuation of the slats and flaps, operating with a hydraulic fluid known as Hyjet.
Aerospace Undercarriage Hydraulic System Qualification Test Rig
GRN Systems engineers designed and supplied a test rig that replicated the aircraft’s hydraulic system, powered by three Engine Driven Pumps (EDPs), to service the main and nose landing gear.
The project included the provision of an acoustic enclosure housing three large motors that drive the EDPs, as well as the commercial hydraulic pipework that carries hydraulic fluid from the EDPs to the various aircraft interface points within the customer’s test rig facility.
Automotive Projects
Diesel Pump Test Rig
GRN Systems engineers have designed and built a diesel pump test rig to carry out comprehensive functional testing for a leading truck manufacturer.
The system is automatically loaded by a six-axis robot, which picks components from a palletised conveyor.
Within the test rig, a cambox assembly replicates the engine cylinder block and camshaft, accurately simulating real engine conditions.
The setup also incorporates a genuine truck fuel rail, which is pressurised up to 3000 bar during testing to ensure full performance verification under realistic operating conditions.
Fuel Injector Actuator Test Rig
GRN Systems engineers have designed and built a Fuel Injector Actuator Test Rig specifically for testing and flushing the actuators used in gas/diesel bi-fuel truck injectors.
The Unit Under Test (UUT) is the upper section of the injector, which is thoroughly tested and cleaned before the costly nozzle assembly is installed.
The rig features two independent test heads, allowing simultaneous operation of identical test sequences.
Each cycle begins with a flushing process to remove contaminants, followed by a cleanliness verification using inline particle counters to ensure the actuator meets stringent cleanliness standards.
Defence Projects
Small Arms Ammunition Induction Annealing Machine
GRN Systems engineers and Induction Coil Solutions have developed a fully automatic high speed Induction Annealing Machine for Small Arms Ammunition.
The machine is capable of a feed rate of up to 280 rounds per minute based on 5.56mm ball. Each lane is fed from its own hopper that orientates and feeds the case to an escapement mechanism and purpose designed feed chain.
Naval Ship Servo Valve Test Rigs
GRN Systems engineers built and delivered a suite of seven advanced test rigs designed for large hydraulic servo valves used on naval vessels.
Installed within a dedicated service facility, these rigs support the full maintenance and refurbishment of existing shipboard valves.
Each rig provides comprehensive testing capabilities, covering all mechanical and electrical sub-assemblies to ensure optimal valve performance and reliability.
Unusual Projects
Art Production Spin Rig
GRN Systems engineers built a custom spin rig designed for high-end art production.
This innovative system rotates large canvas panels at adjustable speeds, enabling seamless application of paint and specialty coatings.
A motorised indexing carriage positions the operator smoothly across the canvas, ensuring complete access to the work surface as it spins — delivering precision, efficiency and creative freedom.
F1 Turbocharger Balancing Rig
GRN Systems engineers have designed and built a state-of-the-art test rig to balance turbochargers for a leading Formula 1 team.
The custom rig provides a fully functional platform to spin and test the turbocharger under realistic operating conditions.
It integrates an engine oil feed, cooling water system, oil scavenge line, and compressed air feed.
To replicate exhaust gas flow, compressed air is heated to 140°C and directed through the turbocharger’s exhaust turbine, enabling speeds of up to 120,000 rpm.
This allows for precise balancing and performance validation of high-speed F1 turbochargers.
UKCA Marking Compliance
GRN Systems ensures that all machines are designed, built and delivered in full compliance with UKCA requirements. Certification is obtained through the applicable conformity assessment process, guaranteeing regulatory conformity.
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