How Directional Valves Affect Oil Flow in Hydraulic Systems

Directional valves are some of the most fundamental components of a hydraulic system. When a directional valve is sized for an application, it must be large enough to handle the volume of oil necessary to operate the cylinder or hydraulic motor. For applications that require less than 10-15 gallons per minute of oil flow, a direct solenoid-operated valve is used (as shown in Figure 1). To shift the valve spool, current is applied to the valve coil. This creates magnetism within the coil, which pulls in the plunger. The plunger then acts on a pushpin, which shifts the valve spool. The solenoid generates approximately 30 pounds of force to shift the spool. Once the spool shifts, oil is ported through the valve and then to the cylinder or hydraulic motor.

 

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Identifying Turbine Oil Cleanliness Levels

“We recently ran a particle count run on our turbine lube oil. I don’t have any reference point for our results, but of our two units, one was much higher than the other. I need to know what reasonable numbers are for particles.”

 

Water Saturation as a Screening Method for On-site Oil Analysis

When and How to Use Friction Modifiers

The purpose of a lubricant is to reduce the amount of friction between two surfaces. In some cases, the base oil in the oil or grease may not have enough lubricity to perform this function sufficiently. The component metallurgy may also require special chemistry. For example, with worm gears, traditional extreme-pressure or anti-wear additives often are too chemically aggressive for the softer yellow metals. In this situation, friction modifiers are added to increase the oil’s lubricity. 

 

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Reducing Hydraulic System Noise

many industrialized countries have regulations restricting noise levels in the workplace. The high-power density and corresponding high noise emission of hydraulic components cause industrial hydraulic systems to be the target of efforts to reduce mean noise levels.

 

How to Make Your Own Hydraulic Hoses