In my series of weekly hydraulics bulletins that go out to anyone who opts in to receive them, there are two messages that always provoke a response.
The first of these two bulletins sets out to explain how a double-acting cylinder becomes a displacement cylinder when the piston seal leaks and the load is acting to retract the piston rod. … Read more
A rookie systems engineer designed the (simplified) circuit shown below. The cylinder extends and retracts (auto cycles) as part of an industrial process. During commissioning, the cylinder cycled as intended. But as soon as the hydraulic system reached operating temperature, the cylinder started drifting out between cycles, causing the PLC to shut down the entire process.
The systems engineer had … Read more