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Resolving the concerns of sewage treatment and water-purifying plants ... YOKOTA Enhanced Self-Priming Pump UPM, UPS types (PAT.)

The important life line that supports our modern lives is our water supply and sewer systems.
Normally, we pay little attention to our use of the water supply and sewer system until there is a disruption caused by some natural disaster, then we realize its importance and the arduous efforts required to maintain the system.
Recently, the role of the water supply and sewer system is becoming more important than ever before for conservation of the natural environment. Promoting efficiency and reducing cost are also important tasks.

YOKOTA, as a company finding solutions to water and liquid handling needs, offers you various means of solving your concerns with pump and valve equipment for water supply and sewer systems to help you promote efficiency and reduce costs.
The following are some examples.


"Concern 1" - Sewage treatment plants


When an excess amount of rainwater enters the holding tank of a sewage treatment plant, it is discharged using a rainwater pump, although some rainwater that could not be discharged remains in the tank.
Rainwater retained in the tank starts to decay and smell over time.
If this polluted and odorous rainwater were to be released into the river, the river would also become polluted and smelly, resulting in environmental problems.
Is there any appropriate method to handle this problem?

Sewage treatment plants
Holding tank description


"Concern 2" - Sewage treatment plants


Sewage collecting at sewage treatment plants contains large amounts of soil as well as pebbles and sand.
Sewage treatment plants

Sewage treatment plants

Sewage treatment plants


Sewage flowing into a receiving well is sent to a discharge well by a large "screw pump" after soil in the sewage is removed by a soil extractor.
It is extremely expensive to transfer sewage from a receiving well to a discharge well (construction, equipment, and maintenance costs).
Is there any way to effectively reduce these costs?

Screw pump external view
Screw pump external view


"Concern 3" - Water purification plants


There are between 10 and 20 sedimentation ponds located at water purification plants.
There is a lot of floating matter such as algae and floating grass on the surface of sedimentation ponds.
Water purification plants
Water purification plants
Water purification plants

Floating matter on sedimentation ponds is removed by hand. Removing all of it using a net is labor intensive and expensive.
Is there an easier method?

Water purification plants

Water purification plants




The YOKOTA Enhanced Self-Priming Pump UPM, UPS types have addressed these problems.

For "Concern 1", YOKOTA can solve environmental problems at low cost.


The YOKOTA Enhanced Self-Priming Pump UPS type can draw up retention water from a holding tank, and then pressurize it to deliver it to a sewage treatment plant.
As a result, polluted and odorous retention water is not released into rivers. This pump has been highly evaluated for its role in environmental conservation of rivers, and odor reduction from holding tanks.

A City Sewerage Bureau D Pumping Station
Administrative building,
rainwater drainage pump
Rainwater drainage building,
rainwater drainage pump
Pumped retention water
rainwater drainage pump, Enhanced Self-Priming Pump
rainwater drainage pump, Enhanced Self-Priming Pump
Pumped retention water

A City Sewerage Bureau D Pumping Station

Rainwater drainage pump: UPS-20-1520N

Rainwater drainage pump:Enhanced Self-Priming Pump UPS-20-1520N


A City Sewerage Bureau T Treatment Plant

Water pollution control pump: UPS-20-1520N

Water pollution control pump:Enhanced Self-Priming Pump UPS-20-1520N



For "Concern 2", YOKOTA can reduce drainage transference cost by 50%.


The YOKOTA Enhanced Self-Priming Pump UPS type can easily transfer the drainage from a receiving well to a discharge well instead of a "screw pump". Moreover, 50% of the cost for construction, equipment, and maintenance can be reduced.

Construction cost:

Equipment space (both inside and outside) can be reduced by approximately 50%, reducing construction cost significantly.

Equipment cost:

Equipment cost can be reduced by more than 50% by using the UPS type pumps.

Maintenance cost:

A non-clogging impeller has been adopted on the UPS type pump structure, and YOKOTA duplex stainless steel alloy YST130N has been used on the drainage passage for high corrosion and wear resistance. In addition, maintenance is easier compared to submersible pumps since it is horizontally mounted on the floor.


Comparison with conventional type and the YOKOTA UPS type (image comparison including the equipment space)
Conventional type
YOKOTA UPS type

Conventional type

YOKOTA UPS type Enhanced Self-Priming Pump


For "Concern 3", YOKOTA can improve work efficiency substantially while reducing labor intensity.


The YOKOTA Enhanced Self-Priming Pump UPM type removes floating matter easily, improving working efficiency substantially, and reducing cost.

The actual work process is like using a vacuum cleaner at home.
The light YOKOTA Enhanced Self-Priming Pump UPM10 type can suction floating matter quickly and pump it to a specified place.
If you choose the higher vacuum performance pump (option) according to the usage, work efficiency will further improve.

Suction intake (test product), Enhanced Self-Priming Pump


Suction intake (test product)

Suction intake (test product), Enhanced Self-Priming Pump



About the YOKOTA Enhanced Self-Priming Pump UPM, UPS types (PAT.)

This is a volute pump with an interlocked water-air separating impeller and a vacuum pump.
The mixture of water and air gathered in the center of the volute pump is centrifugally separated by rotation of the water-air separating impeller and only the air is drawn out by the vacuum pump. Therefore, the volute pump always shows stable and supreme pumping performance without being blocked by the air.

Unique features

Capable of continuous suction and transfer of liquids containing air or solids such as high viscosity liquid, muddy water containing gravel, and sewage containing empty cans (i.e., gas-solid-liquid multiphase flow).

Enhanced self-priming type which needs no priming liquid even at initial operation after installation.

The intake piping can be constructed in many ways such as with waved pipes or across embankments.

A wide variety of materials are available, including YOKOTA's corrosion and wear resistant special stainless steel casting (YST) among others.


UPM type: Vacuum pump built-in type
UPS type: Vacuum pump mounted/separate types
UPM type: Vacuum pump built-in type
UPS type: Vacuum pump mounted/separate types


For details of each product, please refer to
Enhanced Self-Priming Pump UPM, UPS types
Special Stainless Steel YST series


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