Peripheral Pump

ROLWAL: a Professional Peripheral Pump Manufacturer

Our company was established in 1990 and is located in Daxi, the hometown of pumps in China. We have self-operated import and export rights.

Variety of Products

We can provide customers with various types of water pumps, welders, and motors, such as centrifugal pumps, peripheral pumps, self-priming jet pumps, deep well submersible pumps, submersible sewage pumps, MMA welding machine, MIG welding machine, TIG welding machine. We can also provide portable car battery chargers.

Professional Production Equipment

Our factory is equipped with many types of equipment, including production lines, processing centers, testing centers, etc. We have also arranged professional production personnel to monitor all aspects to ensure the high quality of each product.

Rich Market Experience

Our company has established export trade relationships with customers in many countries and regions, and our products are sold to the Middle East, Southeast Asia, Europe, Africa, South America and other places. Our products have received favorable comments from many customers.

Multiple International Certifications

Various products such as water pumps, welding machines, and motors we produce have passed ISO9001 and CE certification. At the same time, we have professional design and production teams that continuously develop and innovate new products.

Brief Introduction to Peripheral Pumps

A peripheral pump is a close-coupled centrifugal pump with an impeller consisting of a large number of radial vanes on the outside edge. The impeller rotates in a concentric casing channel with the liquid flowing between the vanes and casing transmitting large amounts of energy leading to a large increase in pressure within the pump. The inlet and outlet of the casing are separated by a strip of metal ensuring all fluid entering the inlet is discharged via the outlet. They are typically designed for clean fluids due to the narrow clearances between the impeller vanes and pump casing meaning any solids would stop the impeller. Peripheral pump applications tend to be applications where a medium to high pressure liquid transfer pump is required of low viscosity which can be for hydro cyclone feed, filtration, transfer of fluids across large distances, jetting, and for display fountains.

Working Principle of a Peripheral Pump

In essence, peripheral pumps are niche products that sit between displacement pumps and centrifugal pumps. In many applications in the industry, the medium is pumped in a peripheral channel, which is why we call it that. This pump works as a volume displacer by sucking the liquid through the suction flange. The liquid is then directed into an annular channel. A peripheral impeller rotates within this channel, centrifugally transforming the liquid. Peripheral impellers are special impellers that have a large number of small radial vanes arranged around their perimeter. The blades in the impeller impart great kinetic energy onto the liquid as it exits the pump via the discharge flange after passing through the annular channel. Peripheral pumps contain impellers with many small radial blades (with dual inputs) arranged along their peripheral area. Within the rotor, centrifugal forces create a circulation of the flow between the impeller and casing channel. A fluid and an impeller have essentially the same peripheral speeds, but the fluid in the casing channel has a significantly lower speed. Thus, the fluid flows spirally from the casing channel to the impeller, which occurs several times along the perimeter. As more vortices form, more energy is transferred, and the produced pressure is higher. With a reduced flow, the number of spirals increases, so there is a greater transfer of energy and a higher amount of power absorbed in partial-load conditions.

Components of Peripheral Pumps

Motor
The motor is the source of power for a peripheral pump. This motor is powered by electricity in which it operates by converting the electrical energy into mechanical power. The electrical energy is supplied by the mains electricity line. The mechanical power is provided in terms of torque and speed depicted on the motor shaft.

Impeller
This is the part of the pump that rotates at high speed to create a vacuum in the pump. This vacuum is meant to force fluid from its source into the pump. Peripheral pump manufacturers design the impeller with radial vanes. Such vanes are used to rotate the fluid as it enters the pump.

Casing
This is the pump housing meant to seal off the atmosphere to the pump interior and prevent fluid leakage. The casing is designed to allow fluid to rotate between it and the impeller as the fluid kinetic energy is converted to pressure energy. This high-pressure energy is used to move the fluid to the required destination. Peripheral pump manufacturers produce the casing from high strength materials like stainless steel or cast iron to ensure it can withstand high fluid pressure.

Suction Pipe and Valve
The suction pipe is used to connect the pump inlet port to the source of the liquid like a tank. This is the pipe that is used to convey the liquid from its source into the pump when the impeller starts rotating. The suction valve is used to regulate the amount of fluid that flows into the pump. Peripheral pump manufacturers also design this valve with a strainer to help filter out any foreign materials from getting into the pump and causing a blockage.

Discharge Pipe and Valve
The discharge pipe connects the pump to the pipe network. The valve is used to regulate the fluid flowing from the pump to the pipeline.

Advantages of Peripheral Pumps

Efficient Performance

Peripheral water pumps are designed for high efficiency, ensuring effective water transfer and distribution.

Compact Design

These pumps have a compact and lightweight design, making them easy to install and transport.

Self-Priming Capability

Peripheral water pumps are self-priming, meaning they can draw water from a lower level without external priming assistance.

Durability

They are built with durable materials, ensuring long-lasting performance even in demanding conditions.

Cost-Effective

Peripheral water pumps are relatively affordable compared to other types of pumps, providing a cost-effective solution for water transfer applications.

Applications of Peripheral Pumps

Industrial Applications of Peripheral Pumps

Industrial applications of peripheral pumps are varied and diverse, making them a fundamental component in many industrial settings.
● Peripheral pumps offer high-pressure capabilities and can effectively move liquids with low viscosity. For this reason, these types of pumps are commonly used in the transfer of water, solvents, oils, fuels or chemicals.In manufacturing processes, peripheral pumps play an important role in lubrication systems for machinery components such as bearings and gears.
● They also support coolant systems that regulate the temperature of equipment during operation. In addition to this, they help maintain hygiene standards by supporting cleaning procedures within production facilities. Peripheral pumps are also suitable for use in wastewater treatment plants where they aid in the conveyance of sewage sludge from one stage to another.
● These types of pumps possess excellent self-priming abilities which make them ideal for handling viscous slurries or semi-solids. Peripheral pumps have extensive usage within the construction industry where it is often necessary to pump water from excavation sites before any work can begin on-site foundations or other infrastructure projects.
● Peripheral pumps provide critical support across numerous industries including manufacturing processes like lubrication systems and coolant regulation; maintenance functions such as cleaning procedures; wastewater treatment plants through efficient sludge handling capacities; construction sector requirements by pumping out excess groundwater from excavation sites prior to building foundation installations.

Agricultural Applications of Peripheral Pumps

Agricultural settings often rely on peripheral pumps to deliver water and manage irrigation systems.
● One common application of these pumps is in drip irrigation systems, where they can provide a consistent flow of water to plants while minimizing waste.
● Another use for peripheral pumps in agriculture is for spraying crops with pesticides or fertilizers. These pumps are able to distribute liquids evenly across large areas, making them an efficient choice for farmers looking to maintain healthy crops.
● In addition, peripheral pumps can be used for livestock watering systems, providing a reliable source of water for animals in remote locations.
● They can also be utilized in aquaculture operations, helping to circulate and oxygenate the water in fish tanks and ponds.The versatility of peripheral pumps makes them a valuable tool in agricultural settings.

Common Types of Peripheral Pumps

Self-Priming Peripheral Pump
This is a pump designed with the capability to prime itself every time it starts working. The priming process is meant to remove entrained air in the suction pipe. This air must be removed before the pump starts transporting fluid to the pipeline otherwise it will damage the pump or cause low fluid flow. In its priming state, this pump acts like a liquid ring pump. It operates by producing a vacuum in the pump. This vacuum helps to move air into the pump from the suction pipe. It also helps to create a cylindrical ring of the fluid on the interior of the pump housing. Such a design helps to create a gas-tight seal that stops air from returning from the discharge end to the suction line. Bubbles of air get trapped in the liquid on the impeller vanes and then they are moved to the discharge port. The air is then expelled and the liquid goes back to the reservoir in the pump casing under gravity. The liquid goes up the suction pipe as it is being evacuated. The process goes on until all the air in the suction pipe and the pump is replaced by the liquid. Once all the air is removed, the normal pump operation starts. Peripheral pump manufacturers design this pump such that when the pump is turned off, there remains enough liquid in the pump so that the pump can prime itself in the next pumping process.

Magnetic Drive Peripheral Pump
This is a pump that uses magnetic technology to drive the impeller. Peripheral pump manufacturers design this pump with two magnets that are the outer (drive) and inner (driven) magnets. The outer magnet is connected to the motor while the inner magnet is mounted in the pump. When the motor shaft rotates, it forces the outer magnet to rotate at the same speed. Due to the magnetic field pattern, the inner magnet also rotates at the same speed as the outer magnet. Since the inner magnet is connected to the impeller shaft, it forces the impeller to spin at the same speed. This creates a vacuum in the pump which then draws the liquid for pumping. This type of pump is very good for use in applications that involve hazardous fluids like acids and other chemicals. This is because the pump does not use mechanical seals which can leak such liquids and thus it helps to reduce chances of environmental damage or legal action. However, it comes at very high cost relative to other pumps.

Single-Stage Peripheral Pump
This is a pump designed with one impeller. This is one of the most frequently used peripheral pumps. It is preferred due to its simple design, low cost, and ease to repair. However, this pump has low-pressure energy relative to other pumps with more than one impeller.

Multistage Peripheral Pump
This is a pump designed with more than one impeller. It is recommended for use in applications that need large-pressure energy. The more the number of impellers, the higher the pressure energy produced. This pump is expensive relative to the single stage and it is also large in size.

Plastic-Lined Peripheral Pumps
This is a pump whose interior is lined with a plastic material such as Teflon and or PVC. This pump is best suitable for handling corrosive liquids like acids and salty water. The main use of the plastic coat is to help prevent the wear of metallic components by corrosive products. However, the use of this pump is limited to only low temperatures since its use at high heat levels would distort the plastic lining.

Difference Between Centrifugal and Peripheral Pumps

At first glance, centrifugal and peripheral pumps may appear similar, but upon closer inspection, we find significant differences in terms of durability, pressure, water flow and ease of use. These differences are crucial when selecting the right pump for your specific needs. We understand the importance of choosing the right pump and therefore recommend that you carefully consider the following aspects:

Pump Purpose

If your primary need is for higher pressure, extended service life and relatively simple maintenance, the centrifugal pump is probably the most suitable choice. These pumps are known for their robustness and efficiency in situations requiring constant flow and high pressure. In contrast, peripheral pumps, while more affordable and suitable for water lifts at significant heads, can experience problems such as turbine scaling if not used for an extended period of time.

Water Head

This is a critical factor in choosing your pump. If you need to pump water at elevations above 14 meters, a peripheral pump is more suitable, as these pumps are designed to work efficiently in these conditions, despite their lower flow rate. Centrifugal pumps, although powerful, may not be as efficient in these high head situations.

Available Budget

Cost is an important factor in decision making. Peripheral pumps are typically more affordable, costing up to half the price of a centrifugal pump. This price difference makes peripheral pumps an attractive option for applications with limited budgets, as long as they meet your specific needs in terms of pressure and lift.

What to Look for When Buying a Water Pump

There is no doubt that owning a water pump can come in very handy for a number of reasons. Maybe you live in an area where flooding occurs regularly and need submersible pumps to help clean up afterwards, or are interested in water pumps to fill your swimming pool. Perhaps you need it for everyday use in pumping up water from a borehole or water well. Whatever the need for purchasing any water pump, you should think about your specific requirements so you choose the correct one:

GPM Discharge Capacity

All water pumps are measured in GPM discharge capacity which tells you how quickly and powerfully the water is pumped through it. In simple terms, it's the rate the water flows from the source to the discharge point in gallons per minute. If you need it for a job to move lots of water fast, then you need a pump with a higher GPM discharge capacity.

Vertical Suction Lift

This will tell you what the vertical distance is from the water source to the pump itself. If you are picking up a water pump for something like draining a pond or a flooded basement, this is important to bear in mind so you know the distance is enough to get it to the pump for discharge.

Maximum Head Lift

The maximum head lift will let you know what the total height of the pump is from the water source to the discharge point. This figure tells you how powerful the pump is and what distance it can move water over for the job you're needing it for.

Type of Water Pump

There are different types of water pumps, depending on the job you need it for. These include submersible pumps, water-boosting pumps, self-priming pumps, borehole pumps and many more. Research each type and make sure you get the right one for your needs.

4 Tips to Protect Your Water Pump System from Freezing During Winter

Insulation is Key
Insulating your pump gives protection against the cold to stop your pump from freezing. A simple way of insulation is to wrap the pump in bubble wrap (taking extra care not to restrict the airflow around the motor). For insulating pipes that run outdoors or indoors, you can apply the insulation on the walls or directly to the pipes. Another way to directly insulate the pipes is to use heating cables, as their temperature can automatically adjust to what is required.

Keep the Pump Switched on
As water pumps and pipes may have water sitting in them for a longer period that can freeze if temperatures fall very low, make sure that you keep the pump switched on. In water supply applications, allow the pump to keep running from time to time by leaving a tap partially open. This will help to protect against freezing, but you must be careful not to run your pump against a closed head as this will cause it to overheat and burn out.

Drain the System
If you decide to shut down your water pump and system, ensure that it is water free, so it doesn't freeze and cause damage. The first step is to find the drain plug at the lowest point and ensure that the water drains from the pump. Remember that any pipework or control equipment will need to be drained too.

Heating
If temperatures fall significantly and your pump isn't insulated. Have a small heater set up close by, which will protect the pump against freezing. Keep in mind that the cost of replacing your entire pumping system could considerably outweigh the additional energy costs used for heating the pump. However, you will need to be careful when using a heater near the pump, pipes or the water system, as if they are made of flammable materials, they can melt and cause further damage.

9 Tips for Water Pump Safety

We would like to give you some tips on water pump safety. The following content is by no means all-inclusive, but is intended to remind you of some basics.

Always read your owner’s manual. No matter what brand pump you decide to purchase, every company knows how to operate their own pumps with the highest degree of safety. While safety fundamentals are always the same, specifics often differ, depending on what brand and what type of pump you are installing.

Always make sure all safety guards and shields are in place while operating your water pump.

Never run an overheated pump. If your pump overheats, turn it off immediately, and allow it to return to air temperature. Then, vent the pump at the drain plug if applicable. Consult the owner’s manual before restarting.

Never use a pump for fluids for which it was not intended nor designed. The two most dangerous cases are using a water pump for corrosive or flammable fluids, such as acid or gasoline, and using a pump for fluids that are too viscous for the pump to safely transport.

Always keep your pump at least 3 feet away from walls and other equipment during operation. This allows the pump’s motor or engine to ventilate properly, and avoids turning the pump into a fire hazard if it overheats.

On engine driven pumps always be careful not to overfill the fuel tank. When you have filled the tank to the proper level, be sure to close the cap tightly. Also, do not spill fuel during fuelling or refuelling.

If the pump is a gas pump, remember that it emits carbon monoxide as it runs. Don’t run the engine indoors. If you must place the engine indoors, ventilate the area to the outside and seal it off from the rest of the building.

Never use a pump in a flammable or explosive environment. The heat from the pump could cause a fire or an explosion.

Keep your pump out of the reach of children, or keep your children away from the pump.

Our Certificate

Below are our certificate:

Our Factory

Below are our factory:

Frequently Asked Questions

Q: What are the important considerations when selecting a pump?

A: Pump efficiency, power consumption, ease/speed of maintenance, proven reliability and availability of the pumps all affect total cost of ownership - these are important factors when selecting a pump or system for a new installation or a retrofit.

Q: How does a pump work?

A: There are several designs of pumps, however, generally pumps on the whole use a motor and an impeller to add energy in some form to the water, thus increasing the speed and or pressure of the water coming into the pump. Different types of pumps are designed to highlight or improve on a particular performance feature that we may require, for instance: some pumps increase the pressure but not too much volume, where others increase volume significantly but not too much pressure.

Q: What is the most common problem of water pump?

A: Overheating is a common problem that can affect water pumps. Factors such as high ambient temperatures, lack of lubrication, or a malfunctioning thermostat can cause this. Symptoms of overheating include abnormal noise, reduced performance, or water leakage.

Q: Do water pumps need maintenance?

A: To keep pumps running properly, a regular maintenance schedule should be implemented and followed. Consult the original manufacturer's guidelines. Consider the timing to schedule your maintenance.

Q: Can a water pump run continuously?

A: It is advised to run the pump for no more than 10 hours in a single run. Give it time to cool down and then you can start the motor again. Make sure you do not start it more than the specified limit. Also, make sure that the pump is always submerged.

Q: How do peripheral pumps work?

A: The fluid in a peripheral pump is pumped into a peripheral channel (around the edge of the casing). Unlike standard centrifugal pumps, the curves do not flatten as the fluid flow decreases. To summarise the fluid moves along the circumference for the inlet to the outlet of the casing with increasing pressure.

Q: What are the disadvantages of a peripheral pump?

A: The downside to peripheral pumps is that they can be less efficient that most radial pumps. However, the biggest disadvantage is that peripheral pumps use rotation rather than suction to move the liquid, therefore have low or almost no suction power.

Q: What are the consequences of pump failure?

A: Pump failures can lead to severe consequences, such as flooding, water damage or complete failure of the piping system, so it is essential to take steps to prevent them.

Q: How do you prevent pump failure?

A: Avoiding pump failure can be simple - regular maintenance and condition monitoring are good ways to detect issues like corrosion or severe wear and tear before they cause problems. System audits and reviews can help catch more complex problems - like an oversized pump that is starting to cause pipe damage.

Q: What are common failures in pump system?

A: Pump failure can be caused by several issues, including but not limited to: Pressure: restrictions in the pump's suction can result in cavitation of the pump. Root causes of this are generally undersized suction lines, plugged suction strainer or valve issues.

Q: How pump efficiency can be improved?

A: Proper maintenance and upkeep can improve your pump's efficiency and extend its useful life. This includes things like bearing inspection, lubrication, and replacement, impeller inspection and replacement, wear ring replacement, mechanical seal inspection and repacking, and motor/pump alignment check.

Q: What causes pump impeller damage?

A: It's common to find pump impellers with significant surface damage. The three most common causes of surface damage are erosion, corrosion and cavitation. For each of these there are characteristics which will help indicate the primary cause of the damage.

Q: How to choose the right size peripheral pump for your needs?

A: When selecting a peripheral pump, it is crucial to carefully consider the appropriate size that caters to your specific requirements. Functioning as a centrifugal pump, a peripheral pump finds its niche in low-flow, high-pressure applications, notably catering to tasks such as irrigation, water supply, and boosting. In order to make an informed decision regarding the appropriate size of a peripheral pump, it is essential to take into account the specific flow rate and pressure requirements of your system. The flow rate, quantified in gallons per minute (GPM) or liters per minute (LPM), signifies the volume of water the pump can effectively transport within a given time frame. On the other hand, pressure, measured in pounds per square inch (PSI) or bars, represents the force generated by the pump to propel the water through the piping network. In order to ascertain the necessary flow rate and pressure requirements, it is imperative to consider several factors. These include the dimensions of the area to be irrigated or supplied with water, the vertical lift and horizontal distance between the water source and the intended location, as well as any potential obstacles that might impede the flow, such as changes in elevation or bends in the piping system. After establishing your specific flow rate and pressure requirements, you can proceed to select a peripheral pump that precisely fulfills those needs. It is crucial to opt for a pump that falls within the appropriate range of flow rate and pressure, aligning with the demands of your system. Selecting a pump with an inadequate flow rate or pressure may result in an insufficient water supply while opting for a pump with an excessively high flow rate or pressure can lead to energy wastage and potential damage to the system.

Q: How to install and maintain your peripheral pump for maximum efficiency?

A: Achieving optimal efficiency when utilizing a peripheral pump requires meticulous attention to both installation and maintenance. While a peripheral pump stands as a dependable and efficient apparatus for facilitating water movement within your system, it is crucial to ensure proper installation and diligent upkeep to unlock its full potential. For the installation of your peripheral pump, it is essential to guarantee its levelness and secure fastening, while ensuring the correct connection of suction and discharge lines. Following installation, it is imperative to conduct routine inspections of the pump, diligently examining for any indications of wear and tear. Regular cleaning of the impeller and strainer is crucial to prevent clogging and maintain seamless pump operation. Prompt replacement of any damaged or worn components is equally important. By adhering to regular maintenance practices, you can effectively prolong the lifespan of your peripheral pump and optimize its efficiency to the fullest extent. By following these simple tips, we are confident that you can keep your peripheral pump in great condition and enjoy a reliable and effective water system.

Lewei Pumps Industry Co., Ltd. is one of the most professional peripheral pump manufacturers and suppliers in China, featured by quality products and low price. Please rest assured to buy bulk discount peripheral pump for sale here and get free sample from our factory. Also, customized service is available. hvac pump, single stage peripheral pump, end suction peripheral pump