Category Archives for Valve

Hydraulic Needle Valves

Needle valves are similar in design and operation to the globe valve. Instead of a disk, a needle valve has a long tapered point at the end of the valve stem. A cross-sectional view of a needle valve is illustrated … Continue reading

14. January 2011 by and
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Hydraulic Globe Valves

Globe valves are probably the most common valves in existence. The globe valve gets its name from the globular shape of the valve body. Other types of valves may also have globular-shaped bodies. Thus, it is the internal structure of … Continue reading

14. January 2011 by and
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Hydraulic Gate Valves

Gate valves are used when a straight-line flow of fluid and minimum flow restriction are needed. Gate valves are so-named because the part that either stops or allows flow through the valve acts somewhat like a gate. The gate is … Continue reading

14. January 2011 by and
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Hydraulic Ball Valve

Ball valves, as the name implies, are stop valves that use a ball to stop or start a flow of fluid. The ball, shown in figure 6-1, performs the same function as the disk in other valves. As the valve … Continue reading

14. January 2011 by and
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Hydraulic Valve Troubleshooting

Listed below are areas that you can diagnose in hydraulic valves. When working on a specific machine, refer to a machine’s technical manual for more information. a. Pressure-Control Valves. The following lists information when troubleshooting relief, pressure-reducing, pressure sequence, and … Continue reading

14. January 2011 by and
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Hydraulic Valve Installation

Since a flow-control valve meters flow in one direction only, the inlet and outlet ports must be correctly connected in a circuit in relation to the flow direction to be metered. A valve’s drain connection must be piped to a … Continue reading

14. January 2011 by and
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Flow Control Valves

Flow-control valves are used to control an actuator’s speed by metering flow. Metering is measuring or regulating the flow rate to or from an actuator. A water faucet is an example of a flow-control valve. Flow rate varies as a … Continue reading

13. January 2011 by and
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Hydraulic Solenoid Operated Two- and Four-Way Valves

These valves are used to control the direction of hydraulic flow by electrical means. A spool is shifted by energizing a solenoid that is located at one or both ends of the spool. When a solenoid is energized, it forces … Continue reading

13. 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 Manually Operated Four-Way Valve

This valve is used to control the flow direction manually. A spool is shifted by operating a hand lever (Figure 5-27). In a spring offset model, a spool is normally in an extreme out position and is shifted to an … Continue reading

13. January 2011 by and
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