what is a two stage hydraulic pump quotation

Northern Hydraulics offers a full line of 2-stage hydraulic pumps for your log splitters, compactors, and press-type applications. Haldex/Concentric pumps have a cast iron gear housing and are available in flows ranging from 9 GPM to 28 GPM. These 2-stage hydraulic pumps are designed for heavy-duty use and long cycle times. The Haldex brand assures you are getting top-quality, high-performing products. Northern Hydraulics replacement pumps also have a cast iron gear housing and are available in flows ranging from 5 GPM to 28 GPM. These log splitter hydraulic pumps are ideal for the recreational wood splitter user, as they are still a quality product, but offered at a much lower price point.

2-stage hydraulic pumps are used in motor-driven operations wherein a low-pressure, high rate inlet must be transferred to high pressure, low flow-rate outlet. Single-stage pumps are rated to a static max pressure level and have a limited recycle rate.

To achieve high pressure without a 2-stage unit, the drive engine would require significantly higher horsepower and torque capacity but still lack an effective cycle rate. Other hydraulic pump variants exist – such as piston pumps – but are expensive, making 2-stage units more feasible.

For example, a single gear hydraulic pump might be designed to generate a high-pressure output. Still, it will be unable to repeat a cycle rapidly due to a necessarily low flow rate at the intake. A 2-stage unit ensures consistent flow to increase cycle turnover.

Compactors utilize a similar 2-stage process. High-pressure flow drives the compacting rod, while the low-pressure flow retracts the mechanism and feeds the high-pressure chamber for repeated impacts.

2. Once the first-stage pressure meets a certain pressure threshold, a combiner check valve will open and feed into the second-stage, small-gear unit – joining flows at relatively low pressure.

3. A load sensing pin will trigger the unloading valve to open and the check valve to close. The flow will be directed exclusively to the discharge port.

4. A small amount of fluid may feedback to a load sensing pin to measure the pressure at the outlet and signal lower flow rate in the first unit, lowering the pressure and providing the conditions for a cycle to repeat.

A piston pump operates according to variable displacement. Flow is determined by the angle of an internal slant disk attached to the pump shaft. Pump adjustments – like torque or horsepower limiters – allow piston pumps to emit a max flow rate regardless of pressure level.

In most cases, hydraulic piston pumps are an order of magnitude more expensive than gear-based pumps. Potential downtime and part replacement in high volume work conditions exacerbate price disparities further.

Chiefly: fuel and power consumption. A piston pump operating in high-pressure ranges will regularly demand the full horsepower capabilities of its associated drive engine – increasing the power utilization of the system.

Opportunity cost may also be considered when using a piston pump. Depending on the application (e.g., log splitting), work output can be heavily impacted by the cycle speed of the pump. Not only is a piston pump more expensive to peruse, it is also slower than 2-stage pumps.

Panagon Systems has specialized in manufacturing industry-standard and custom hydraulic assemblies for 25 years. Reach out to our team for a consultation on your specific operational and equipment needs.

Hydraulic pumps convert mechanical energy into fluid power energy. All hydraulic pumps are positive displacement which means the outlet flow is sealed from the inlet flow. A small amount of fluid is designed to leak internally to lubricate and cool the internal components of the pump. The only function of the pump is to produce flow in a system. Bailey International, LLC provides a wide range of pumps and accessories including clutch pumps, dump, gear, jaw couplers, mounting brackets, pistons, PTO, vane and two stage pumps.

A two-stage hydraulic pump is two gear pumps that combine flow at low pressures and only use one pump at high pressures.  This allows for high flow rates at low pressures or high pressures at low flow rates.  As a result, total horsepower required is limited.

Pumps are rated at their maximum displacement.  This is the maximum amount of oil that is produced in a single rotation.  This is usually specified in cubic inches per revolution (cipr) or cubic centimeters per revolution (ccpr).  Flow is simply the pump displacement multiplied by the rotation speed (usually RPM) and then converted to gallons or liters.  For example, a 0.19 cipr pump will produce 1.48 gallons per minute (gpm) at 1800 rpm.

Simply put, gear pumps are positive displacement pumps and are the simplest type you can purchase. Positive displacement means that every time I rotate the shaft there is a fixed amount of oil coming out.  In the diagram shown here, oil comes in the bottom and is pressurized by the gears and then moves out the top.  The blue gear will spin clockwise. These pumps are small, inexpensive and will handle dirty oil well.  As a result, they are the most common pump type on the market.

I found that I was constantly waiting for the cylinder to stroke so that I could insert the next piece.  I was really good at determining how much stroke I would need so that wasn’t wasting time over stroking the cylinder.

A piston pump is a variable displacement pump and will produce full flow to no flow depending on a variety of conditions.  There is no direct link between shaft rotation and flow output.  In the diagram below, there are eight pistons (mini cylinders) arranged in a circle.  The movable end is attached to a swashplate which pushes and pulls the pistons in and out of the cylinder.  The pistons are all attached to the rotating shaft while the swashplate stays fixed.  Oil from the inlet flows into the cylinders as the swashplate is extending the pistons.  When the swashplate starts to push the pistons back in, this oil is expelled to the outlet.

So, we don’t actually turn one of the pumps off.  It is very difficult to mechanically disconnect the pump, but we do the next best thing.  So earlier in the article I mentioned that pumps move oil they don’t create pressure.  Keeping this in mind, we can simply recirculate the oil from the pressure side back to the tank side.  Simple.   So, let’s look at this as a schematic.

Luckily, turning off the pump is quite simple and only involves two components: a check valve and an unloader valve.  The check valve is there to keep the higher-pressure oil from the low flow pump separate from the oil in the high flow pump.  The higher-pressure oil from the low flow pump will shift the unloader valve by compressing the spring.  This allows flow from the high flow pump to return to the suction line of the pump.  Many pumps have this return line internal to the pump, so there is no additional plumbing needed.  At this point, the high flow pump uses little to no power to perform this action.  You will notice that the cylinder speed slows dramatically.  As the log splits apart, the pressure may drop causing the unloader valve to close again.  At this point, the flows will combine again.  This process may repeat several times during a single split.

The graph above shows the overlay of a performance curve of a piston pump and two stage gear pumps.  As you can see, the piston pump between 700 psi and 3000 psi will deliver the maximum HP that our engine can produce and as a result, it will have maximum speed.  Unfortunately, it will also have maximum cost.  If we are willing to sacrifice a little performance, the two-stage pump will work very well.  Most of our work is done under 500 psi where the two pumps have identical performance.  As pressure builds, the gear pump will be at a slight disadvantage, but with good performance.  The amount of time we spend in this region of the curve is very little and it would be hard to calculate the time wasted.

After the pump on my log splitter died, I replaced it with a two-stage pump.   While I was missing out on the full benefits of the piston pump, there was a tremendous increase in my output (logs/hr.).  I noticed that instead of me waiting on the cylinder to be in the right position, I was now the hold up.  I couldn’t get the logs in and positioned fast enough.  What a difference!

As you go from a standard two-stage pump to your own custom design, you will find that you will need to add the check valve and unloader separately.  However, there are many available cartridges manifold out there already that make this simple.  Some even have relief valves built in!

Two stage pumps are wonderful creations!  They allow for better utilization of pressure, flow and power by giving you two performance curve areas.  They also show their versatility in conserving power which leads to energy savings while remaining inexpensive.  A lot of these pumps come pre-made and preset, but you can make your own!  See if your next project can get a boost from one of these wonderful devices.

Hydraulic pumps come in a wide range of styles and designs, and Flowfit Hydraulic two stage hi-lo gear pumps are amongst the most efficient available. These models can give you much faster cycle times and provide a higher maximum pressure, whilst only utilising a small engine. Typically, two-stage hi-lo gear pumps are excellent for use on log-splitters and hydraulic press applications.

Running at 85% efficiency, our range of hydraulic pumps are amongst the most effective in compactly designed hydraulic components available in the UK. With various designs, all available with a range of GPM specifications, you will be able to find the ideal model for your systems requirements amongst our extensive range.

• The Economy pump is best suited to power small to medium size fixtures. Its lightweight and compact design makes it ideal for applications which require easy transport of the pump. ...

This two-stage, continuous pressure (demand) pump contains all the necessary controls and circuitry for powering single- or double-acting continuous pressure workholding systems. It has ...

Compact, Portable, Cordless Hydraulic Pump for MRO Applications. Compact, Li-ion 18VDC, 9.0 Ah battery-powered pump provides extended run-time. Two-stage, ...

This electric/hydraulic pump is a two-stage, continuous pressure (demand) pump that contains all the necessary controls and circuitry for powering any ...

The axial piston pump generates a maximum working pressure of 700 bar with an oil flow of 0,61 per minute. Tne pump is equipped with a low pressure stage ...

The HP245 range of high flow, two speed, manually operated pumps is ideally suited for applications where high tonnage cylinders are to be used on sites, without any available electric ...

... ready for immediate use. The HP227FP pump incorporates the same specification and features of the HP227FPC pump however is supplied without the pressure gauge, gauge mounting block and 3 metre hose assembly.

... The Marzocchi 1HL, 1PHL and 2HL High/Low hydraulic gear pumps are special double stage pumps with special integrated valves as shown in the hydraulic ...

Hand or foot pumps – Nominal pressure: 700 bars. Overload valve operating pressure: 720 bars.Dual-stage (two-speed) pumps fitted in their standard versions with a coupler ...

The radial piston pump type R consists of valve-controlled pump elements arranged in star form around an eccentric. For large flow rates, up to 42 pump elements can be set up in 6 stars ...

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572 two stage hydraulic pump products are offered for sale by suppliers on Alibaba.comAbout 13% % of these are pumps, 4%% are hydraulic pumps, and 1%% are other hydraulic parts.

A wide variety of two stage hydraulic pump options are available to you, You can also choose from gear pump, vane pump two stage hydraulic pump,as well as from high pressure two stage hydraulic pumpand whether two stage hydraulic pump is 1 year, or 6 months.

Replacement Log Splitter Pump Kit: This replacement log splitter hydraulic pump kit consists of high-quality parts with high strength and hardness, which is capable of good wear resistance, durable in use and is replaceable and compatible with OEMs like Speeco, Huskee, and Champion, etc.

Powerful Hydraulic Pump: This powerful pump is a 2-stage 16GPM hydraulic pump offer you the fastest possible cycle times, which ensures a fast start and long using period for each time. It dramatically reduces the labor intensity, improves work efficiency.

Excellent Performance: Equipped with other hydraulic tools like jaw coupler and pump bracket, it can carry out lifting, pressure type, elbow, bending row, straightening, cutting, assembly, demolition and many other works with a hydraulic log splitter.

Multiple Model Combinations: As this log splitter pump kit is designed for meeting the replacement of a variety brand, the parts of this kit have a standard specification that is suited for your multiple combinations for your demands.

Wide Application: Used in applications where extending a hydraulic cylinder is needed, truck tailgate lift, scissor lift, dump trailer, lift truck, snowplow, aerial platform, road signs, material handling, wheelchair lifts, etc.

Founded in the year 1985, Indotech Hydraulics are the prominent name indulged in Manufacturing, Tradingand Service Providing a good quality array of Hydraulic Motor, Hydraulic Valve and much more. The provided products are specifically fabricated in adherence with worldwide quality standards using supreme quality basic material and latest technology under the leadership of talented personnel. These products are widely demanded all across the nation owing to their high durability, sturdy design and longer service life. In addition, the complete variety of products is accessible in diverse stipulations & can also be customised as per the varied necessities of our customers at pocket-friendly rates.

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