The following circuit layout is showing a regenerative clamp circuit. This type of circuit should be used with caution. It must be used for a coupled circuit, and will typically result in a faster double acting actuator response. It should be noted that due to the nature of fluid flow through this type of system, some valves may not respond well with this type of configuration.
The following circuit is likely to exhibit problems with the return of the single acting devices. Because fluid is forced both in and out of a double acting device, the return flow of fluid being forced through the tank path is likely to cause backpressure on the single acting devices. Work supports and small single acting actuators may be slow to return because of this backpressure.
BLEEDING AIR FROM THE SYSTEM
Air is a compressible gaseous medium, and as a gas, will expand to completely fill the size of its enclosure. Hydraulic fluid, on the other hand, is a liquid, which has a definite volume and as a liquid, is basically non-compressible. In a hydraulic system, force is achieved by applying pressure to an actuator. Since air is compressible, the first thing that must happen when pressurizing a system is to compress the entrapped air. (Air trapped in a system can cause devices to actuate with a jerky, or spongy motion, as well as add to the length of time required to build the system to the desired operating pressure.) As long as there is enough
Hydraulic Clamping Fundamentals Rev - D
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