Category Archives for Hydraulic Pressure Control

Hydraulic Pressure Switches

A pressure switch is an instrument that automatically senses a change in pressure and opens or closes an electrical switching element, when a predetermined pressure point is reached. A pressure-sensing element is that part of a pressure switch that moves … Continue reading

22. December 2010 by and
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Hydraulic Fuses

A hydraulic fuse is analogous to an electric fuse and its application in a hydraulic system is much the same as that of an electric fuse in an electrical circuit. A simple illustration of a hydraulic fuse is shown in … Continue reading

22. December 2010 by and
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Hydraulic Sequence Valve Application

Let us consider a hydraulic circuit in which two cylinders are used to execute two separate operations as shown in Figure 6.24. Now, let us assume that cylinder A is required to extend completely before cylinder B extends. This can … Continue reading

22. December 2010 by and
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Hydraulic Sequence Valve

A sequencing valve again is a normally closed pressure control valve used for ensuring a sequential operation in a hydraulic circuit, based on pressure. In other words, sequencing valves ensure the occurrence of one operation before the other. A sectional … Continue reading

22. December 2010 by and
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Hydraulic Pressure Reducing Valve Application

Let us consider a hydraulic circuit where one cylinder is required to apply a lesser force than the other as shown in Figure 6.20. Here cylinder B is required to apply a lesser force than cylinder A. This is accomplished … Continue reading

22. December 2010 by and
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Hydraulic Compound Relief Valve

A compound pressure relief valve is one which operates in two stages. They are designed to accommodate higher pressures than direct acting relief valves at the same flow rate capacity. To have a broad understanding of how a compound pressure … Continue reading

22. December 2010 by and
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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) … Continue reading

25. December 2009 by and
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Hydraulic Brake Valve Application

A brake valve performs the same function as a counterbalance valve, but it is designed to overcome a key disadvantage. An example will illustrate this point. Suppose a direct-operated counterbalance valve is used in a motor circuit. There are times … Continue reading

25. December 2009 by and
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Hydraulic Counterbalance Valve Application

The counterbalance valve, also called a holding valve, is used to prevent a weight from falling uncontrollably. As an example, consider a press with a two-ton platen (Fig. 3.27). When the directional control is shifted, the platen will fall unless … Continue reading

25. December 2009 by and
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Hydraulic Sequence Valve and Pressure-Reducing Valve

The sequence valve and pressure-reducing valve have some similar features. It is instructive to compare their symbols side by side (Fig. 3.20). Both valves are externally drained, meaning that there is a separate line from the valve back to the … Continue reading

25. December 2009 by and
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