Tags: Pressure Control

Hydraulic Pressure Control Applications

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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) and (b) shown in Fig. 3.31. 2. A 1.79-in3 displacement motor is turning at 804 …

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Hydraulic Pilot Operated Relief Valve

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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 opens completely over a narrow pressure range. This allows the circuit to operate over a …

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Directional Control Valves Symbols

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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 necessary to review the three most common center configurations (Fig. 3.1) for spool-type directional control …

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