Tag Archives: hydraulic pump

Which Pump Will Work With Your Portable Hydraulic System?

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Portable hydraulic pumps are taking over more tasks that would otherwise require dangerous and strenuous human labour. These time and back-saving devices make significantly lighter work of a plethora of plant maintenance chores such as lifting equipment, tightening and loosening bolts, spreading flanges, and cutting corroded nuts. As powerful as these tools are, using the right pump is crucial to ensuring safety and efficiency on the job.

 

Because of the vast spectrum of capabilities and functions of portable hydraulic pumps, several factors should be taken into account when determining the appropriate power source. Hydraulic tool users can choose from three primary power sources: hand, electric, or air. Each method offers unique benefits relative to a wide range of situations.

 

Hand Pumps

A hydraulic hand-powered pump is usually the simplest and most economical type of pump to use. It is ideal for sporadic use of small or medium-sized hydraulic tools and is especially suitable for use in remote locations where other reliable power sources cannot be secured. In some potentially hazardous cases, a manually powered pump could be the only viable option as it does not require a source of power that could ignite.

 

Hand-operated pumps are available in sizes ranging from smaller single-speed devices weighing less than 5 kg to larger metal two-speed models weighing almost 45 kg. These pumps can come with oil capacities of up to eight litres and valving for either single or double-acting tools. The proper hand pump will meet requirements for system oil capacity, fluid compatibility, and valving type. Duty cycle is not a major issue because a hand pump is normally used for short one-time tasks.

 

The primary drawback with hand-powered pumps is its reliance on manual effort: its use is limited to the physical ability of its operator. Additionally, since one hand must be used to work the pump, the operator must sacrifice convenience and efficiency. Although hand-powered pumps are quite portable, they may not be operative in cramped locations, such as on ladders or catwalks, where operators may not be able to generate enough power. Further, these types of pumps require a flat surface for operating.

 

Electric Pumps

Electric pumps are the most common high-pressure pumps used after hand-powered pumps. Electric units come with versatile options of motor types, heat exchangers, valves and actuators, and operating voltages. The abundance of variations makes it challenging to choose the correct pump in this category.

 

While the major factors in selecting a pump are size, voltage, reservoir capacity, and valving, the additional aspects of electric motor and the necessary duty cycle are critical in choosing the best electric pump. Duty cycle is the time frame in which the pump will run at a particular percentage of full loads. Most high-pressure pumps are not suitable for higher duty cycles. Tasks that necessitate pressures over 5,000 psi for over an hour require pumps with coolers to regulate oil temperatures at a safe level of 65C (150F) or less. Electric motors are either induction or universal. The application determines the proper selection of either.

 

Induction motors operate for longer periods of time with greater durability. They perform at reduced noise levels, which is a significant benefit for jobs in restricted spaces. Induction motors are usually heavier, which explains why they are more commonly used in areas where a stationary, high-production pump is needed. An induction motor requires a highly stable electrical power source. A reduction in line voltage — even as small as 10 percent — could cause extensive damage to the motor. Using this kind of pump is not advisable for settings where electricity is sourced by a generator with an extension cord.

 

A universal motor pump may be ideal for situations that require the performance and speed of an electric pump and flexibility with portability and power sources. These motors are lighter than induction motors, provide more power in proportion to weight, and can function with less stable electrical power. If necessary, universal motors can run full torque on half of terminal rated voltage.

 

Air Pumps

Like a hand-powered pump, an air pump is relatively easy to use, portable and lightweight. Air pumps are available in many different sizes. They offer greater performance capabilities relative to hand-operated pumps. Another advantage is that they can be safely used in a location where an electrical current could be hazardous, provided that the pump is positioned at a sufficient distance from a compressor.

 

Reciprocating pumps are more popular than other air pumps, offering greater performance at lower cost. Usually, they are single-speed models that provide high flows at lower pressure since it can operate faster under diminished loads. However, a dual reciprocating air-powered pump is available for situations where high flow is necessary. With this design, the high-flow unit can stall at high pressure without an unloading valve.

 

A rotary air pump is ideal for higher performance needs. This type of pumps utilizes a rotary air motor which drives an ordinary hydraulic pump. However, rotary air pumps are typically noiser, heavier, and need more air than reciprocating pumps.

 

Sufficient air supply is the most critical factor to consider when choosing either air pump style. All air-powered pumps require a certain air flow rate to perform at their maximum level. If the airflow rate cannot be determined beforehand, a common standard is that each horsepower at the compressor will supply five scfm (approximately 142 litres).

 

Air pumps are suitable for operation in environments where pneumatic lines have been installed and are easily accessible. However, air pumps are typically more costly to use relative to electric pumps as compressed air tends to power tools less efficiently.

 

Guidelines for Pump Selection

 

  • Determine proper ratings for maximum operating pressure, oil capacity, flow rate, cycle frequency and duration, and valving.
  • Analyze cost factors including impact on productivity and manpower.
  • Research ergonomic and safety features. Weight, dimensions and portability must be considered to help determine the level of dexterity and strength the operator will need. Noise levels should be as low as possible.
  • Know the power source requirements. The power that is safely available often determines what pump is best to use.
  • Ensure that tool speed matches pump size needed. Power requirements increase exponentially with pump size. The ideal pump matches the necessary speed without superseding it.

 

If you need more information of portable hydraulic pump or other hydraulic pumps, I recommend you to visit YEOSHE Hydraulics Technology Co., Ltd. – they are the professional hydraulic pump and hydraulic unit supplier Taiwan. To get more details of hydraulic pumps, please do not hesitate to contact with YEOSHE.

 

Article Source: https://www.rg-group.com/blogs/which-pump-will-work-with-your-portable-hydraulic-system/

3 Benefits of Hydraulic Pumps

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A pump is a device which has many purposes and can be used for various tasks and in various industries. Usually pumps are used to transfer certain substances like gas or liquid from one place to another. There are many types of pumps, but one particular which is widely used is the hydraulic pump. These pumps can be either hydrostatic or hydrodynamic and are used mostly in hydraulic drive systems. Gear pumps, rotary vane pumps and screw pumps are the three most commonly used types of hydraulic pumps. All are used in many different industries.

 

Whereas most pumps use some external power source to operate, hydraulic pumps use the kinetic power of the water as their main source for operation. They are very durable, easy and relatively cheap to maintain and very practical. These pumps are also very efficient which is why they are common in many industries and inevitable tool for many companies. Here are few major benefits of hydraulic pumps.

 

The hydraulic pumps are very useful source of energy and power for many machines. They have a capability and are designed to push large amount of fluid through a metal cylinders. This is how these pumps transform mechanical energy into hydrostatic energy. Hydraulic pumps have been used for many years, but their popularity slowly dropped with the emergence of the electric and solar pumps. However, today, the interest for hydraulic pumps has increased as it is a very effective device for providing clean drinking water in rural areas or in the financially unstable countries which have battle the lack of water problem.

 

Also these pumps are widely used by government agencies when dealing with certain types of natural disasters such as floods. In the case of a flood, hydraulic pumps will quickly and effectively pump out excess water to reduce the overall damage to some extent. Households located in flooding areas should have one of these. They may look complicated but are really very easy to use and maintain and can find usage even in the most remote places. One of the biggest benefits that a hydraulic pump can provide is getting the water from underground sources that are not contaminated. The lack of clean water and the hygiene problems are major concerns in developing countries. The hydraulic pumps surely help a lot in solving such problems. This brilliant engineering invention can be used in almost any industry which is the main reason it is so popular.

 

If you need more information about hydraulic pump suppliers, I recommend that you can visit YEOSHE Hydraulics Co., Ltd. – the company specializes in kinds of pumps including hydraulic vane pump, tandem pump, excavator pump, etc. Learn more details, please do not hesitate to check out YEOSHE website.

 

 

Article Source: http://www.3benefitsof.com/3-benefits-of-hydraulic-pumps/

Comparisons between Variable and Fixed Displacement Hydraulic Pump

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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 Hydraulic Pump

A fixed displacement hydraulic 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 Hydraulic Pump

In a variable displacement pump, the flow rate and outlet pressure can be changed as the pump operates. This results in variable displacement hydraulic 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 hydraulic pumps are perfect for single jobs that need to be repeated indefinitely over long periods of time; variable displacement hydraulic pumps can be used to power a wider variety of tools, but require more expense and more attention.

 

Anson is the professional intra vane fixed displacement hydraulic pumps manufacturer in Taiwan. We provide various intra vane pump series, including IVP series, IVPQ series, IVPV series, and cartridge kits and so on hydraulic pumps. Welcome to send inquiries and feel free to contact Anson for more details about fixed displacement vane pumps and more hydraulics.

 

 

Article Source: http://peerlessengineering.com/blog/hydraulic-pumps-fixed-vs-variable-displacement/

 

Hydraulic Pumps (Fluid in Motion)

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Hydraulic pumps convert mechanical energy and motion into hydraulic fluid power. The basic idea is very simple: force that is applied at one position is transmitted to another position using an incompressible fluid, like oil, which cannot be compressed but rather is displaced when pressure is applied.

A reservoir, a hydraulic cylinder, and a pump make up the three main parts of a hydraulic pump. Pumping hydraulic fluid from the reservoir into the bottom cavity of the cylinder causes the piston rod to be pushed up, which pushes the fluid in the other cavity back into the reservoir. This procedure pressurizes the chamber and extends the piston to its full length. Pumping hydraulic fluid into the upper chamber of the cylinder pushes the piston rod down, pushing the oil in the other chamber back into the reservoir, completing the cycle.

Popular Hydraulic Pump Types

  • Vane pumps, piston pumps, and gear pumps are the foremost types of hydraulic pumps
  • Gear pumps – uses gears to pump fluid by displacement. Hydraulic gear pumps are one of the most common types of pumps. There are several advantages and disadvantages to gear pumps. The advantages are: high speed, high pressure, and quiet operation. The disadvantages are: the use of four bushings in the liquid area and fixed end clearances.
  • Rotary vane pumps – are positive-displacement. They include a ring mounted inside a cylindrical case. There are a number of radial slots in which sliding vanes are located. Mounted to the case is the ring and the vanes are designed to press against the inside wall of the case. Hydraulic pressure or spring force or centrifugal force as the ring is rotated will cause the vane to be forced against the wall.
  • Axial piston pumps – are positive displacement. There are several pistons in a circular arrangement in a cylinder block.
  • Radial piston pumps – a circular arrangement of hydraulic pistons, and valves which allow pressures greater than 650 Bar (~10,000 psi) to be built.
  • Screw pumps – positive displacement pumps. Have one or more screws that rotate to transfer high or low viscosity fluids along an axis.

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