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Category: Hydraulic Pump

Important Facts about Hydraulic Pumps

Hydraulic pumps are an essential part of some of the major machinery and equipment that are used to complete vast and complicated tasks. If you have ever worked with construction, manufacturing, or industrial equipment, chances are high that you were using some kind of hydraulic pump. Keep reading for more information on the pumps.

How Hydraulic Pumps Work

The hydraulic pump is a simple machine, but it achieves the highest levels of pressure when compared to other pumps. Speaking in general terms, the pump takes mechanical energy and turns it into hydraulic energy. Hydraulic pumps apply pressure to hydraulic liquids and initiate the process of positive displacement. Positive displacement includes the expansion and contraction of the cavities inside of the pump. The liquid inside of the cavities are then allowed to leave the pump at a high pressure level. Although there are other pumps that have similar operations, the hydraulic pump is one of the most preferred.

Primary Uses for Hydraulic Pumps

Hydraulic pumps are used for creating very high fluid pressures in order to work efficiently. With that being said, these pumps are typically included in high-powered equipment, such as construction machinery (forklifts, scissor lifts, back hoes), manufacturing equipment, industrial machinery, and elevators.

There are also a variety of pumps. Your use of the pump will determine which kind of hydraulic pump you will need. You may be in need of a gear pump, which is the simplest form of the hydraulic pump. Rotary vane pumps have more power than gear pumps, but are typically used for medium pressures. Screw pumps are typically used at low pressures for high level flows. Radial piston pumps are used for smaller sized flows at high pressures.

Choosing the Right Hydraulic Pump

Hydraulic pumps come in all different varieties. To determine what pump you will need, there are some determining factors you must first figure out. The most common factors are figuring out the needed pressure, the flow rate of the fluids, the power of the pump, efficiency numbers, and the temperature needed for operation.

Hydraulic pumps are essential to carry out specific functions that include moving fluids at high pressures. If you need to use a hydraulic pump, it is important to know what pump you need and the specifications you should meet with the pump.



The Versatility of a Hydraulic Pump

The primary purpose of a hydraulic pump is to pressurize hydraulic fluid in order to operate machinery. This can be anything from farm equipment to aircraft parts. A hydraulic pump can either send fresh fluid through it, known as an open loop system or used fluid which would be known as a closed loop system. Each have their own operational purposes depending on the application or the job that is required to be done.

Although there are a variety of hydraulic pumps available for just about any industrial operation, below are two distinct types of pumps.

Fixed Displacement Hydraulic Pump

More limited to its applications then other hydraulic pumps, this less expensive and simplistic pump maintains a set flow of fluid through the pump. The most basic being a gear pump which sends the pressurized fluid through a set of gears and through the outlet running the basics of machines. Using a set of Archimedes spirals instead of gears, the fluid picks up good pressure as it flows through rotating screws. This allows for a higher flow rate of fluid at a low pressure.

Variable Displacement Hydraulic Pump

Being able to control the rate of flow and the outlet pressure allows this pump to offer a variable drive. It also makes them a little more complex and expensive due to this capability.

Other Higher Efficiency Pumps

Best suited for middle range pressure are the rotary vane hydraulic pumps. Here, pressure is increased from the use of concentric, offset vanes. This is where the working fluid is forced into smaller volumes increasing that pressure. The bent-axis piston and cylinder designed hydraulic pump is most likely the best when it comes to efficiency and output. Built similar to that of a vehicles piston and cylinder engine, it can run at high pressure while maintaining the desired efficiency. Using two cylinders per piston, the double action design of this pump can certainly up the throughput.

Hydraulic pumps are such a versatile piece of equipment. They are available in a large variety of designs for just about every budget and application. Many models can even be paired up to increase output if necessary. With a hydraulic pump, there is no doubt you will get the job done.


Vacuum Pump – Uses and Care

The vacuum pump and hydraulic pump are some of the many inventions that have a huge impact on the lives of human beings. The vacuum pump, in particular,  is a product of some of the most brilliant minds in the world. Vacuum pumps have a number of important uses, which are not only limited to the household setting, but they are valuable for industrial applications as well.


Uses of Vacuum Pumps

Vacuum pumps can provide you with a multitude of services. They are essential in the processing of composite plastic molding and used in checking the flight instruments in simpler and older aircrafts. They are also utilized in the production of vacuum tubes, electric lamps and CRTs when they are refilled or evacuated with a specific gas. Vacuum pumps are also useful for vacuum coating on metals, plastics and glass for decoration. They are also used in Radio-surgery, Radio-pharmacy, Radiotherapy and other critical medical treatments. These are only some among the many uses of vacuum pumps.


Care and Maintenance

Vacuum pumps are very efficient tools, but they can also malfunction and fail to perform its functions because of exhaustion of minor particle damage. This is something that you wouldn’t want to happen. Vacuum pumps are useful to you only when it’s in a good condition. Its condition can easily be maintained by simple greasing and conditioning a few times a year.



In the unfortunate times when your vacuum pump fails, be sure that you know what to do or where to go. Most of the reputable companies selling vacuum appliances offer maintenance and repair services when you purchase one. If you have done so, then you merely have to set-up an appointment with their repair center. Another option is to go to a trustworthy repair company and have them handle the job. The most important thing to keep in mind when your tool needs to be repaired is that it has to be done by a professional. Inexperienced companies or individuals will only do more harm than good. You man need to shell out a few more bucks for the professional service, but this is a better choice than messing up with your tool.


Hydraulic Pumps: Types and Operating Specifications

How do hydraulic pumps work? Well, hydraulic pumps are capable of rotating and moving like a motor, and they use that rotation to move hydraulic fluid. Their power is generally brought in from outside mechanical sources. Looking for the best tools like vacuum pumps and hydraulic pumps entails looking into their manner of operation and their features — so let’s do that.


How Are Pumps Categorized?

Hydraulic pumps are grouped into subcategories, basing on their type and operating specifications. The types can be external or internal or a vane, or it can be a radial or an axial piston. Operating specifications include operating speed, temperature, horsepower, maximum and continuing operating pressures. It can also be pump weight, viscosity and maximum fluid flow. Let me elaborate more on the operating specifications and types of hydraulic pumps.


Types Of Hydraulic Pumps

The axial piston type makes use of axially-mounted piston, which is an important part when pressurizing fluid. This process takes place after the mechanical energy is used to operate the piston. The piston travels through the pump chambers and takes charge of pressurizing the fluid.

The radial piston type uses radially-mounted pistons. It may utilize an alternate motor to operate several pistons. A power source is needed to put the pistons to action and pressurize the fluid.

The other types of pumps are self explanatory. For example, the internal gear pump, from the name itself, uses internal gears, while the external gear pump obviously makes use of external gears. Likewise, the vane pump uses the vane in the process.


Operating Specifications Of Hydraulic Pumps

The proper functioning of the pump relies on the continuous operating pressure of the hydraulic pumps. On the other hand, the maximum amount of pressure can also provide intermittent pressure to the outlet. As mentioned earlier, as well as horsepower and temperature.

The pump’s operating speed refers to the number of revolutions it makes per minute, or it may refer to the number of  rotations of the moving parts. The horse power is measured depending on the flow and pressure of the fluid. Another important specification is the temperature, which indicates the temperature conditions that the pump can withstand.

Understanding Hydraulic Pump Types and Differences

There are many types of machinery that are driven by or actuated by a hydraulic pump. There are a variety of different systems that are used to generate the flow and pressure required and they all have a hydraulic fluid and a system that controls the fluid and pressure with hydraulic valves. The pump needs to driven and this can be done by any force generating device such as an electric motor, an internal combustion engine, wind power or even a person operating a lever or crank.

How It Works
A hydraulic fluid is put under pressure by the hydraulic pump and the pressure can then be used to drive a piston or drive unit via hydraulic lines. A hydraulic valve is used to switch the force on and off to give control of the device. The control can be mechanical or electrical and may be actuated manually through a lever or a button or automatically through control system.

Volume and Pressure
There are many different hydraulic systems and they all used a combination of volume displacement and pressure to work. The higher the pressure the more robust a system needs to be because of the tremendous forces involved. In general higher pressure systems are more efficient and the higher the pressure the less flow is required for the same application of force. There are two general types of pumps fixed displacement types that displace the same amount of fluid every cycle and adjustable displacement types that can vary the displacement for increased or decreased pressure.

Pump Types
There are many different types of hydraulic pumps that have different applications. Screw type pumps are good for high volumes at relatively low pressure. They are simple and effective but not particularly efficient. A gear pump has a more balanced pressure and flow and is very simple but is not very efficient particularly as pressure increases.

The vane pump is widely used in system of medium pressure up to 150 bar and beyond. While the axial piston pump is used in applications that require the highest efficiency. Where high pressure above 300 bars is needed the radial piston pump combine high pressure and low flow rates needed in these applications.

Finding the Best Company to Fix and Maintain Vacuum Pump Systems

It is vital to the efficient and trouble free running of your production process to have your vacuum pump system regularly serviced so that any problems can be picked up before a part fails or efficiency is impacted. These devices work on the same principle as hydraulic pumps and have very tight tolerances and precision seals that can be easily damaged if maintenance is not kept up.

The Right Team
The need for specific parts make it vital that the company you choose has the experienced personnel that know the vacuum pump system you are using and which parts are most prone to failure or degradation. This can save a fortune in repair costs and down time by completely understanding the right preventative maintenance requirements so that early signs of wear or failure are picked up and dealt with before they become a problem.

Parts Availability
Generally pump systems are expensive and have a long lifetime when maintained properly. If your maintenance company has a large stock of vacuum and hydraulic pump parts then going forward you can be certain that you will have the parts on hand quickly if a problem develops or an unexpected failure happens.

Service Levels
Any vital piece equipment needs fast and efficient service and the company you select needs to have the resources to respond quickly when you need them. If you have to shut down operations for maintenance then punctuality and the ability to work out of standard hours can be vital. If you operate around the clock then it is important to have a company that has personnel available any time you have a problem.

Upgrades, Refurbishments and Repairs
The complexity and tight tolerances of vacuum pumps mean that a major failure or refurbishment will need to be done in the workshop. Does the company have the ability to exchange pumps, upgrade to newer models or to refurbish the current pumps and have them back in service quickly? These are important questions that will be vital down the track and are important to know so that when you need these major works you can plan accordingly.

Choosing the Right Maintenance for Your Vacuum Pumps and Hydraulic Pumps

Both vacuum and hydraulic pumps see tons of applications in residences and within various industries. But, to keep them working optimally, they need to be cared for and serviced regularly. This helps catch kinks in the system quicker and find ways to keep the system working better, longer. Of course, many pumps are covered by warranties but they are only covered for a limited time. Beyond that time, it is your responsibility to get regular service for your pumps to keep them working optimally. Of course, you could do this yourself if you are certified and comfortable doing regular maintenance. But, what if you are not? How do you choose a reliable company to maintain and repair your pumps? Here are a few tips on choosing the right people for the job:

  • The Team: Every company has its own dedicated team of members who maintain and repair hydraulic and vacuum pumps. And this is great. But, make sure that somewhere in this team are also engineers, preferably mechanical engineers, whose job it would be to know the product inside out. Engineers are often more insightful of the problems a pump would have owing to their knowledge of the device.
  • Finding a Spare: An established inventory is important for any good service/repair company. Make sure the company you choose has a wide inventory of spare parts so they can get them to you at any time. This can be essential if your hydraulic pump or vacuum pump is being used for essential services like delivering water.
  • Quick Response: If you are choosing a repair/maintenance company, you want to be sure that they respond to their clients in a timely manner. Tardy response times are a flag for you to drop the company. You want to be able to get quick service, especially, again, if your pump is being used for something essential. Also, be sure they are good with timelines.

With these three tips, you are sure to find an appropriate company for the maintenance and repair of your vacuum pump or hydraulic pump. Remember, though, that references are important and try looking for services that were referred to you.

The Hydraulic Pump Decoded

With a name like ‘hydraulic’, it is kind of obvious that a hydraulic pump is somehow related to fluids. We can even deduce that it’s somehow used to pump fluids. But, what exactly does its role with fluids? What does it do? Well, here’s a short overview:

How it’s built?
So, we know from basic science that energy (or any substance, for that matter) has the tendency to flow from where there is a lot of it to where there is little. The pump, though, reverses this process by its mechanical action (therefore, mechanical energy). In a hydraulic pump, any mechanical energy is transferred to fluids. The energy generated by the pump is transferred to the fluid within the pump, therefore energizing the fluid to move from an area of low density to high density. Further in the chain of things, this energy held by the fluid is eventually transferred to other parts of the pump (or machine) completing the action. The amount of energy needed, and therefore produced, can be controlled with the use of hydraulic valves.

Types of Pumps

  1. Hydrostatic Pumps: In this type of pump, there is a fixed amount of fluid that is constantly used to generate energy. The amount of energy generated cannot be adjusted.
  2. Hydrodynamic Pumps: These pumps generally use hydraulic valves to allow the amount of energy produced to be adjusted, basically by adjusting the volume of fluid that is being displaced within the pump.

What Does It Do?
This is such a basic design that there can literally be thousands upon thousands of applications of the pump in residential as well as industrial settings. Here are just a few popular applications:

  • Water pumps: The most obvious application of this kind of pump would be to use it to pump water to buildings.
  • Construction: These pumps used in series can be used to build heavy machinery like an excavator.
  • Lifts: Not elevators, but small lifts like in your dump truck and such can be powered by hydraulics.

While these are only a few popular applications of hydraulic pumps, there are tons of applications of it in our day to day lives.

Vacuum Pumps: Wet vs. Dry

Vacuum pumps come in two basic varieties: the ‘wet’ kind, which is essentially a hydraulic pump, and the pneumatic, ‘dry’ variety. Both are used to create suction, which is imparted onto a dynamic substance in order to ‘pull’ more of that substance from the far end of a tube — and generally, to use that same substance in order to perform some sort of work at the tube’s far end. So what’s the difference between wet and dry vacuum pumps? Quite a bit, actually.

Perhaps the most obvious difference between using fluid vs. gas to do work is that gas can be compressed — fluid does not compress. On the one hand, that means that when a hydraulic vacuum pump moves X amount of fluid on this end, there’s an immediate and corresponding movement of X distance on the other side of the system, whereas a pneumatic system is going to have a bit of a delay, and the movement isn’t going to be as precise.

On the other hand, that very give that makes pneumatics less precise can be a lifesaver. If you have, for example, a heavy load and it needs to be brought gently to the ground, a pneumatic system’s ability to dynamically respond via the compression of the pneumatic gas makes that level of delicacy much easier.

Similarly, hydraulic fluid is nonelastic — it doesn’t attempt to ‘snap back’ to a standard pressure if it gets compressed or thinned out. The air in a pneumatic system is elastic, and that elasticity contributes, again, to a pneumatic system’s ability to dynamically respond to changes in the load.

Flow Rate
Because gas flows much more quickly than fluid through the same amount of space, pneumatic systems are snappy and quick compared to hydraulic systems. ‘Dry’ vacuum pumps can move enormous volumes of air in the same span that a ‘wet’ vacuum pump can move only a modest amount of hydraulic fluid.

Pneumatic pumps, then, are good for moving things quickly and dynamically — hydraulic pumps are better for precision movements that involve extremely large loads. Thus, for example, jackhammers tend toward pneumatics whereas backhoes tend toward hydraulics.

Hydraulic Pumps: Fixed vs. Variable Displacement

A hydraulic drive system uses a pressurized fluid to deliver force to distant machinery. Each system has several common components; the most universal is the hydraulic pump. The pump’s purpose is to pressurize the hydraulic fluid so that it will travel down the line and perform work on the other side. In an ‘open loop’ system, the fluid is drawn from a reserve tank, and deposited into the same tank after it has done its work. In a ‘closed loop’ system, the fluid is brought directly back to the hydraulic pump after passing through a hydraulic filter.

Fixed Displacement Pumps
A fixed-displacement pump has a set flow rate — every stroke of the motor moves the same amount of fluid. Fixed-displacement pumps are

  • Simple
  • Relatively inexpensive
  • Easier to maintain

The simplest type of fixed-displacement pump is the gear pump, in which the hydraulic fluid is pushed by rotating gears. In some models, the gears are sequential; in the quieter and more efficient version, the gears are interlocking. Another common variation is the screw pump, which uses the classic Archimedes screw, which looks much like a drill bit, to move the fluid. They have the advantage of providing a high rate of flow at relatively low pressures.

Variable Displacement Pumps
In a variable-displacement pump, the flow rate and outlet pressure can be changed as the pump operates. This results in pumps that are

  • More complex
  • More expensive
  • Capable of doing a wider variety of jobs

The most common type of variable-displacement pump is the rotary vane pump, which is a variation of the gear pump in which the ‘gear’ is offset and the ‘cogs’ aren’t fixed, but rather extend and retract as the gear turns, allowing the pump to increase the pressure of the fluid by compacting it as it pushes the fluid through. The top-tier pumps, however, are bent-axis piston-and-cylinder pumps, much like the ones that are used in an internal combustion engine.

Simple, fixed-displacement pumps are perfect for single jobs that need to be repeated indefinitely over long periods of time; variable-displacement pumps can be used to power a wider variety of tools, but require more expense and more attention.