By Robert J. Sheaf, Founder, CFC Industrial
A customer of mine has a machine that threads both ends of a straight piece of rod stock which then is fed into a second machine to bend it in a “U” shape. This creates a clamp for various round pipe sizes.
They had a problem with their large D08 pilot-operated directional valve. This older design with air-gap designed coils kept seeing the coils burn. To eliminate this issue, they decided to replace the D08 valve with a newer design featuring a pilot with wet armature solenoid coils. Everything went fine for about 10 to 12 cycles, but then the valve would lock up. If they held the shifted position for 1 to 2 minutes, it would shift and run the threading motor. However, when given the order to stop, the motor will run briefly and then slowly stop.
Can you identify what was the problem? We welcome responses of all kinds directly to Robert Sheaf at rjsheaf@cfc-solar.com or to mgannon@wtwhmedia.com. The solution will be provided in conjunction with our June 2024 issue.
Filed Under: Components Oil Coolers, Technologies, Trending, Valves & Manifolds
