To provide the performance envelope required at each test axis, the actuator and servo-valve must be correctly sized and set up. Different tests require different performance characteristics such as a dynamic force, a displacement, a test frequency or a specific velocity. According to the requirement, the servo-valve type and size plays a critical role in getting good control accuracy at the performance level identified. The Servo-valve is therefore a key component in the design of any test system.
Instron offers a full range of servo-valves from 5 liters to 2400 liters/mins which can be fitted to the Hydropuls linear and rotary actuators to meet a wide range of test applications.
Up to 60 liters/min, we offer a variety of mechanical and electrical feedback 2 stage servo-valves, manufactured according to our specification. Manifolds are available to install up to four of these valves onto a single actuator providing high response performance up to 250litres/min per actuator.
From 250 to 2400 liters/min, Instron has developed a range of 3 stage valves. The characteristics of these valves have been optimized to provide the best possible performance in test applications when combined with the Hydropuls actuators. Special versions of these valves are also available for applications which require specific control characteristics.
For applications such as Damper testing where both high velocities and low speed precision control are necessary, it’s possible to install both 3 stage and 2 stage valves onto one control channel using a switching manifold to select the valve required.