Energy Isolation Does Not Stop at the End of the Wire
All too often, it is believed that controlling a machine's electrical power supply will mitigate the risk of accident or failure and render the machine safe.
However, when it comes to machine safety, electrons are just one of many forces and factors that need to be considered. Energy from compressed air, hydraulic pressure, and gravity are often overlooked. Donald Engineering offers not only the components to build a safety system, but the skills and expertise to apply them correctly as well. From risk assessment and risk mitigation, to control reliable containment of energy, we'll help you to properly design a safety system that protects your employees and your investment in order to ensure a lower total cost of ownership.
DUAL MONITORING Block and Bleed Control Valves
These redundant design products, when properly implemented into the safety control and monitoring system using a high diagnostic coverage, can achieve Category 4, SIL 3 coverage requirements.
Dual monitored kits consist of ductile iron manifolds and two single solenoid valves making it a redundant design. The series-parallel circuit design blocks flow and pressure until both valves have been actuated to allow flow and pressure from the supply to the machine. If either valve is deactivated the flow to the outlet port will be blocked from the hydraulic supply source and the outlet port is then automatically connected to the tank removing all potential hydraulic power at the machine.
The solenoid-operated directional valves are equipped with position sensors that monitor the main spool position. The switching position is indicated by a binary signal.
Your Donald Engineering team is ready to help make or keep your systems safe! Email us for questions or to start your project!