Tag Archives for Pilot Operated

Pilot Operated Four Way Valve Hydraulic Symbols

Graphical symbol for pilot-operated four-way valve

05. October 2011 by and
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Pilot Operated Direction Control Valve Diagram

Pilot-operated direction control valve

05. October 2011 by and
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Hydraulic Pilot-Operated Check Valves

The cylinder in the system in Figure 4.22 should, theoretically, hold position when the control valve is in its centre, off, position. In practice, the cylinder will tend to creep because of leakage in the control valve. Check valves have … Continue reading

23. January 2011 by and
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Hydraulic Pilot-Operated, Four-Way Valve

This type of valve is used to control the flow direction by using a pilot pressure. Figure 5-28, shows two units in which the spool is shifted by applying the pilot pressure at either end of the spool. In the … Continue reading

13. January 2011 by and
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Hydraulic Four-Way Valves

Four-way, directional-control valves are used to control the direction of fluid flow in a hydraulic circuit, which controls the direction of movement of a work cylinder or the rotation of a fluid motor. These valves are usually the sliding-spool type. … Continue reading

13. January 2011 by and
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Hydraulic Check Valves

Check valves are the most commonly used in fluid-powered systems. They allow flow in one direction and prevent flow in the other direction. They may be installed independently in a line, or they may be incorporated as an integral part … Continue reading

13. January 2011 by and
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Hydraulic Pilot-Operated Check Valve

The pilot-operated check valve is shown in Fig. 7.11. For flow in the forward direction, this valve operates just like a normal check valve. Pilot line pressure holds the valve open for fluid in the reverse direction. If the pilot … Continue reading

05. May 2010 by and
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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 … Continue reading

23. December 2009 by and
Categories: Hydraulic Pressure Control | Tags: , , , | Leave a comment