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Hydraulics

Due to its immense power, hydraulics are used for operating various machinery, vehicles, aircraft, ships and equipment. The data and engineering revolving around hydraulics is so vast, its hard to comprehend.

1,856 Questions

What happens when pressure is applied to both ports on a hydraulic cylinder?

If you apply the same pressure to both ports, then the piston will move. This is because the areas of the piston are different, due to the piston rod on one side. The force on the large area will be P x A1 and the opposing force will be P x A2, where A2 is less than A1 by the area of the piston rod. The resultant force will be P x (A1-A2).

How do the sizes of the pistons affect the pressure in a hydraulic system?

In a hydraulic system, larger pistons will create more force due to the increased surface area, resulting in higher system pressure. Conversely, smaller pistons will generate less force and lower system pressure. The pressure in a hydraulic system is directly proportional to the size of the pistons used.

What did Archimedes discover concerning water and volume?

Archimedes discovered the law of hydrostatic displacement.

Supposedly, in trying to determine how to find the density of the ruler's crown, he was perplexed by the problem. He decided one night to take a bath and, while sitting down in the bath water, he noticed that the water level went up.

From this, he realized that the amount of water displaced was equal to the volume of his body immersed in the water.

From mass and volume, density can be determined, and he could differentiate between different metals due to densities.

How nitrogen shock absorbers work?

Nitrogen gas is used in shock absorbers to provide a stable and consistent damping force. When the shock absorber compresses, the nitrogen gas compresses as well, creating resistance that helps control the movement and absorb shocks. The nitrogen gas also helps prevent aeration of the hydraulic fluid inside the shock absorber.

How much pressure needs a hydraulic cylinder to operate?

The pressure required for a hydraulic cylinder to operate depends on the size and application of the cylinder. It can range from a few hundred PSI for small cylinders to several thousand PSI for larger cylinders. It's important to consult the manufacturer's specifications to determine the specific pressure requirements for your hydraulic cylinder.

Why should the pressure in a hydraulic system be measured above 60 degrees?

Pressure in a hydraulic system should be measured at above 60 degrees to account for the potential thermal expansion of the fluid. At higher temperatures, the fluid can expand and affect the accuracy of pressure readings if not compensated for. This helps ensure that the pressure readings are consistent and reliable regardless of temperature variations.

How the hydraulic cylinder works?

A hydraulic cylinder works by using fluid pressure to create linear motion. When fluid is pumped into one side of the cylinder, it pushes against a piston, causing it to move in a specific direction. The movement of the piston is then used to exert force or perform work, such as lifting or pushing objects.

Is hydraulic fluid heavier than water?

Hydraulic fluid can be heavier than water, but it depends on the specific type of hydraulic fluid being used. Some hydraulic fluids have a higher density than water, while others have a lower density. It is important to consult the manufacturer's specifications to determine the specific gravity of the hydraulic fluid being used.

How the hydraulic press works?

A hydraulic press works by using hydraulic fluid to generate pressure, which is then used to compress or crush objects between two surfaces. When the fluid is pumped into a small cylinder, it creates a force that is transmitted through a larger piston to increase the pressure and achieve the desired action, such as forming or reshaping materials.

What is the function of a hydraulic accumulator?

A hydraulic accumulator is a device wherein its main function is to store energy in an efficient way. It does this by temporarily removing the stresses and pressures of external sources such as gasses. There are other types of accumulators as well.

How do you calculate force for hydraulics?

To calculate the force in a hydraulic system, you can use the formula: Force = Pressure × Area. First, determine the pressure exerted on the hydraulic fluid. Then, multiply the pressure by the surface area on which the pressure is acting to calculate the resulting force.

What determines the speed of hydraulic cylinders?

The speed of hydraulic cylinders is mainly determined by the flow rate of hydraulic fluid entering and exiting the cylinder. The rate at which the fluid is pumped into the cylinder, along with the size of the cylinder and the load it is moving, also play a role in determining the speed of operation. Adjusting the flow rate or pressure of the hydraulic system can help control the speed of the cylinder.

What information is needed to calculate the force that a hydraulic cylinder can exert?

To calculate the force that a hydraulic cylinder can exert, you would need to know the hydraulic pressure being applied to the cylinder and the effective area of the piston inside the cylinder. The formula to calculate the force is force = pressure x area.

What is the operation of a hydraulic dynamometer?

A hydraulic dynamometer operates by using hydraulic fluid to create resistance against the rotation of an engine or motor. This resistance is then measured to determine the power output of the engine or motor. The dynamometer can be used to test the performance, torque, and power of various types of engines and motors.

Why water is not used as hydraulic fluid?

Water is not used as a hydraulic fluid because it has poor lubricating properties, low viscosity, and high compressibility, which can lead to system inefficiencies and potential damage. Additionally, water is prone to freezing at low temperatures and can cause corrosion within the hydraulic system. Specialized hydraulic fluids are designed to provide better lubrication, corrosion protection, and overall system performance.

What is average velocity of water in pipe?

The average velocity of water in a pipe depends on the flow rate of the water and the cross-sectional area of the pipe. It can be calculated by dividing the flow rate by the cross-sectional area. The units are typically expressed in meters per second.

How can a hydraulic system can be used to transfer a force or control a motion?

In a hydraulic system, force is transferred through a pressurized fluid, typically oil or water. When pressure is applied to the fluid in a closed system, it acts uniformly in all directions. This pressure can be used to operate cylinders, pistons, or motors to control motion in machinery or equipment through the force generated by the fluid.

What is the average value of coefficient of velocity in a submerged orifice?

The average value of the coefficient of velocity for a submerged orifice is typically around 0.97 to 0.99. This value represents the efficiency of the orifice in converting the potential energy of the fluid into kinetic energy.

Why Cd value is high in nozzle meter than orifice meter?

The Cd value (coefficient of discharge) is typically higher in a nozzle meter compared to an orifice meter because the flow profile and pressure recovery characteristics are better in a nozzle meter. Nozzle meters have a converging-diverging shape, which helps in minimizing energy losses and improving the accuracy of flow measurement when compared to an orifice meter design.

What is the operating principle of the venturi meter of flow measurement?

Air flowing quickly over the open top of a vertical tube lowers the air pressure in it. This causes liquid in the tube to rise. (It rises due to the higher pressure acting on the other end. The tube is marked to indicate the wind speed.

Alternatively, if the open vertical tube is in still air and it is connected at its lower end with a horizontal tube containing a flowing liquid, the liquid in the vertical tube will fall when the horizontal flow past the lower end increases.

Does pascal's law work for hydraulic fluids as it does for compressed air?

Yes, Pascal's law applies to both hydraulic fluids and compressed air. It states that a change in pressure applied to a confined fluid is transmitted undiminished to all portions of the fluid and the walls of its container. This principle allows for the transmission of force to be amplified or redirected within hydraulic systems.

What is the function of pressure gauge in hydraulic system?

The pressure gauge in a hydraulic system is used to measure and monitor the pressure of the hydraulic fluid within the system. It helps operators ensure that the system is operating within safe pressure limits, allows for troubleshooting potential issues related to pressure fluctuations, and assists in maintaining optimal performance of the system.

Why are hydraulic system known as force multipliers?

Hydraulic systems are known as force multipliers because they allow a relatively small input force to generate a much larger output force. This is achieved through the use of incompressible fluid that transmits pressure equally in all directions, amplifying the force applied. This makes hydraulic systems ideal for lifting heavy loads or performing tasks that require high force.

How do you calculate which size cylinder bore is required for a hydraulic power pack?

First you need to know what force is required. The pressure the cylinder is going to work at. From this you can wok out the area of the piston and then the diameter of the piston.

Force = Pressure x Area

What is the basic principle of hydraulic press?

The basic principle of a hydraulic press is that the hydraulic oil pressure remains constant in an enclosed system, where, the area on which it acts, will generate a force equal to the area multiplied by the pressure (where, pressure is equal to force per unit area).

This is well defined as per pascal's law, for which, pl refer wikiepedia.