Tag Archives for Pressure Control
Hydraulic Pressure Control Applications
1. A backhoe operator controls the speed of the cylinder, which extends the bucket by cracking open the DCV controlling flow of the cylinder. Describe the difference in the “feel” of the controls using the two different relief valves (a) … Continue reading
Hydraulic Pilot Operated Relief Valve
A pilot-operated relief valve has the same function as a direct-acting relief valve; however, it has a different pressure vs. flow curve. The performance curves for the two types of relief valve are given in Fig. 3.7. The pilot-operated valve … Continue reading
Hydraulic Direct Acting Relief Valve
A schematic of a direct-acting relief valve is shown in Fig. 3.4. Pressure acts on the annular area of the valve spool. The hydraulic force is given by The notation Fs will be used for the spring force. When Fh … Continue reading
Directional Control Valves Symbols
ANSI symbols are introduced here as they are needed. The directional control valve symbol is the most intuitive and selfexplanatory of the symbols. Some experience with the directional control valve symbol has already been gained. At this point, it is … Continue reading