“Every time I unload my cylinder, there is a loud bang.” Press builders have been calling us with this line for as long as I can remember. If the frame, the guides, and the rest of the mechanics check out, the bang is almost always hydraulic press decompression done badly, or not done at all….
When I run training sessions on motor circuits, I put up one chart before anything else. It splits motor control into two parts: moving and stopping. In my experience, moving is about 10% of the problem. Stopping is the other 90%. Most enquiries we get about hydraulic motor valves start with speed, but most of…
A design engineer at a mining equipment maker called me about a prototype machine. The oil around the unloading valve was overheating so fast that within five minutes, you couldn’t touch it. Now and then, the fan motor stopped as well. The valve wasn’t faulty, but there was a problem with where the dump oil…
Thirty machines were already on the road before we found out the problem was a Pilot Operated check valve doing a counterbalance valve’s job. A customer of ours in North India builds sewer suction cum jetting machines. On a new model, the rear cover of the sludge tank, about 300 to 350 kg, was lowered…
Two (amongst many) forklift makers buy relief valves from us for the same job. Both use them to protect attachments, and in this case, a bale clamp attachment. The system flow is at about 35 lpm and 210 bar. One OE fits our DR10 series, a direct acting relief valve. The other OE fits our…
If you are evaluating a pilot-operated relief cartridge for a high-flow mobile hydraulic system, the numbers that matter are flow capacity, maximum pressure, and the pressure rise between cracking and full flow. Our AR Series compact relief cartridges were built around exactly those three numbers: up to 360 l/min, up to 350 bar, and a…
One day, I got a frantic call from a customer along with a video attachment. A man lift was lowering its boom through a counterbalance valve (also called an overcenter valve), and the boom bounced up and down, a foot to a foot and a half each time. It did this from the top to…
