Patented in Japan, U.S.A., other
Bore
40-250mm
Total head
10-90m
Capacity
0.1-13m3/min
>Selection & DimensionsFor suction pumping with outstanding self-priming power:
UHN type
For intake piping across embankments or long intake pipes:
Priming strengthened UHNS/UHNK types
For high density slurry:
Slurry resistant UHT type
For installation in places subject to submersion:
UHPR type with submersible motor
For self-priming sanitary specifications:
SUH type
Outstanding self-priming power
The internationally patented water-air separating mechanism reaches a maximum vacuum of 60-90kPa (6-9m water column) and displays outstanding self-priming power.
No problem with suction of air during pumping
A large amount of incoming air can be separated and discharged during pumping. Even if pumping becomes subject to suction or mixture of air due to fluctuations of suction conditions, it continues pumping, constantly discharging air, and restores normal pumping operation as soon as suction conditions return to normal. Even continuous suction of air-containing water (i.e., gas-liquid two-phase pumping) is possible.
Low NPSH
Even if cavitation develops due to fluctuations of suction conditions such as water level, temperature, or vacuum level on the suction side, this pump can still continue its pumping operation. Therefore, this pump does not require allowance for NPSH, and enables stable pumping operation even under fluctuating suction conditions. It naturally shows outstanding performance for extraction from sealed (vacuum) tanks.
Simple structure without any inlet valve, No need for a foot valve
Due to its simple structure without any inlet check valve, it is robust
and easy to maintain. Moreover, there is no need for installing a foot
valve or an intermediate valve on the intake side under ordinary operating
conditions.
Operation is also easy with no need for priming.
Intake piping across embankments or long intake piping is possible
Because of superior intake power, intake pipes can be installed across
embankments.
Intake piping with long piping is also possible.
Outstanding pumping performance
This single-suction, single-stage centrifugal pump displays outstanding pumping performance in a wide range of specifications.
Large selection of models, Large selection of materials
This self-priming pump has an incomparably wide variety of models available for easy selection. Further, a wide variety of materials are available, including FC, SCS and YOKOTA's corrosion and wear resistant special stainless steel casting (YST), to meet the needs of various kinds of liquid.
Construction that can meet a wide range of specifications
Standard constructions include semi-open impellers for small pumps and closed impellers for medium and larger pumps.
The impeller has been improved to form ideal blades for high efficiency.
An oil bath lubrication system is adopted for bearings.
Maintenance is easy to perform because construction is simple and the number of parts in the water passage section is minimized.
Stable quality
All special material products are manufactured internally in a continuous process to ensure stable quality.
1. Flow of circulation
During self-priming, the water discharged from passage A in the semi-double volute returns to the impeller through passage B-C, and is discharged again into passage A.
2. Removal of bubbles
This recirculation flow mixes the water and the air in the center with intense vortex D within the impeller and discharges it into passage A.
3. Water-air separation and exhaust
The water-air mixture is led from passage A to discharge nozzle B in a cyclonic state and automatically separated by centrifugal force, and then the water is recirculated through passage B-C. The separated air is then held by cavity holder E, and compressed and discharged.
The YOKOTA Self-Priming Centrifugal Pumps can be used even under extreme conditions. They can be used, for example, as chemical pumps for liquids containing air, pumps for mixing air bubbles in an aeration system (i.e., gas-liquid two-phase flow pumps), condensate pumps, drain pumps, and pumps for extraction from sealed tanks.
Chemical industry:
Acids, Alkaline liquids, Solvents, Slurry liquids, other
Food industry:
Brewery, Sugar refining, other
Mining industry:
Seawater, Slurry liquids, other
Paper industry:
Pulp, Effluent, White water, Black water, other
Electric power:
Exhaust gas desulfurizer (Limestone slurry pumps, other), Seawater, Water treatment, other
Electronic industry:
Ultra-pure water manufacturing devices, Acidic waste water, Polishing waste water treatment, other
Aquarium, Fish farming:
Seawater suction, Circulation pumps, other
Others:
Hot springs, Hot oil, other
For aquariums ... UHN type
Made of extraordinary seawater resistant YST alloy
>"Current Topics: Aquarium"
For irrigation pumping stations ... UHN type
Automatic water supply with extremely small tank
>"Current Topics: Irrigation Supply"
For water intake ... Priming strengthened UHNS type
Suction of water through long piping over embankments
>"Current Topics: Snow Removal"
For fish farms ... Priming strengthened UHNK type
Suction of seawater from the sea at a distance of 400m
>"Current Topics: Seawater Intake"
For power plants ... Slurry resistant UHT type
Resolving problematic self-priming of slurry liquids
>"Current Topics: Slurry Self-Priming"
For undersea tunnels ... Submersible UHPR type
Pumping ensured even if submerged in seawater
>"Current Topics: Undersea Tunnel"
Structure
UHN type
Casing
18Seal ring
27-1O-ring
39Sleeve packing
2Suction cover
191Impeller nut
28Impeller key
40Sleeve key
4Impeller
192Impeller nut
29Coupling key
41Pan (Option)
6 Liner ring 201Impeller washer
30Casing packing
42Bearing nut
10Bearing bracket
202Spring washer
31Gland bush
43Bearing washer
11Front bearing cover
21Ball bearing
32O-ring
44Support ring
12Rear bearing cover
22Ball bearing
33O-ring
47V-ring
14Gland
231Stop ring
35Oil level gauge
48O-ring
15Shaft
232Stop ring
361Bearing packing
16Impeller spacer
25Gland packing
362Bearing packing
17Sleeve
27Deflector
37Oil cap
Gland packing
External flushing type is used for contaminated water
pumping or suction pumping.
Non-External-Flushing Mechanical Seal
No need of external sealing water and applicable to any kind of liquid.
Mechanical seal
Various types of mechanical seals can be installed.
Mechanical seal (oil bath)
Oil-bath lubrication allows dry operation.
We can also provide double mechanical seals.
Casing
FC200 FC200 SCS13 SCS14 YST130N CCR10Impeller
FC200 SCS13 SCS13 SCS14 YST130N CCR10Shaft
S45CH SUS304 SUS304 SUS316 SUS316 SUS304Special material products are manufactured internally in a thoroughly continuous process from casting under complete material and heat-treatment control.
YOKOTA's corrosion and wear resistant special stainless steel casting (YST)
has been adopted for anti-pollution devices, seawater pumps, and other
pumps, acquiring highly reputable results.
For details, please refer to Special Stainless Steel YST series.
UHNS/UHNK types:
Priming strengthened types for intake piping across embankments
or long intake pipes
UHT type:
High corrosion and wear resistance type for high density slurry
Specification:
Economical selections can be made from a wide variety of models similar to the UHN type.
Performance:
Impeller configuration can be selected depending on use.
Material:
A wide variety of materials, such as YOKOTA's corrosion and wear resistant special stainless steel casting (YST), are available.
Construction:
Wear resistant plates are installed for handling high density slurry.
Shaft seal:
Gland packing, mechanical seals and Non-External-Flushing Mechanical Seals can be selected depending on use.
UHPR type:
Combined with submersible motor for installation in places subject to submersion
SUH type:
High washability self-priming sanitary pump
Selection chart & Outer dimensions
For more information self priming sewage pump, please get in touch with us!