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Submersible Motors Seal 202UU Water Alkali Pump Seal
The 202UU Series is a robust, single-spring mechanical seal engineered specifically for the demanding environments of submersible motors and water-alkali pumping systems. Known for its compact axial profile and high reliability, the 202UU is the industry standard for preventing fluid ingress in submersible sewage pumps, fountain pumps, and chemical transfer units handling alkaline solutions.
In submersible applications, the 202UU often functions as the primary barrier within the oil chamber, where it must withstand both the external pressure of the pumped media and the internal lubrication requirements of the motor. For alkali services, our 202UU units utilize specialized material pairings that resist caustic embrittlement, ensuring a leak-free operation in high-pH environments.
Technical Specifications
Parameter
Range / Specifications
Engineering Application Insights
Shaft Diameter
12mm - 60mm
Standard metric sizing for submersible shafts
Max Pressure
≤ 1.0 MPa (10 bar)
Suitable for medium-head submersible applications
Operating Temp
-20°C to +120°C
Stable performance in varied fluid temperatures
Peripheral Speed
≤ 10 m/s
Optimized for 2-pole and 4-pole motor speeds
Primary Faces
SiC / Tungsten Carbide (TC)
Superior hardness for handling grit and alkali crystals
Secondary Seals
Viton (FKM) / EPDM
High chemical resistance to alkalis and oils
Metal Hardware
AISI 304 / 316 Stainless Steel
Corrosion-resistant springs and drive components
Key Technical Advantages
Dual-Face Reliability (UU Configuration): The "UU" designation signifies a design optimized for dual-application or high-specification material pairings (such as SiC vs. SiC). This is critical for submersible pumps where the seal must resist abrasion from silt and sand while maintaining a tight seal against caustic alkalis.
Clog-Resistant Single Spring: The large-diameter open coil spring prevents the accumulation of fibrous debris or alkaline scale. Unlike multi-spring designs, the 202UU spring maintains constant axial pressure even in "dirty" water or slurry-heavy environments.
Optimized for Submersible Oil Chambers: Specifically designed to operate effectively within the oil-filled buffer zone of submersible motors, ensuring the secondary seal (O-ring) remains resilient against both the lubricating oil and the external process fluid.
Alkali-Resistant Material Science: For pumps handling sodium hydroxide (caustic soda) or other alkaline cleaners, we provide specialized EPDM or Viton elastomers that prevent "swelling" or hardening, which are common causes of seal failure in chemical services.
Expert FAQ & Maintenance
Why is the 202UU preferred over standard component seals for submersible motors?
Submersible motors experience significant thermal expansion and pressure changes. The 202UU features a flexible non-pusher design that accommodates minor shaft axial play and vibration, which are common during the start-stop cycles of submersible equipment.
Which material pairing is recommended for high-concentration alkali pumps?
We strongly recommend Silicon Carbide (SiC) vs. Silicon Carbide faces paired with EPDM secondary seals. EPDM offers superior resistance to alkaline solutions compared to standard Nitrile (NBR), while SiC faces resist the "leaching" effect that chemicals can have on softer materials.
How do I verify the seal's integrity during a motor overhaul?
During maintenance, check for "tracking" or heat checks on the seal faces. In submersible units, ensure the oil in the buffer chamber is not milky; milkiness indicates a breach in the 202UU seal, allowing water or alkali to contaminate the lubricant.
Product Features
202UU Replacement for: Burgmann pump, diving pump and circulating pump
Double seal design
Unbalanced configuration
Independent direction of rotation
Multiple springs
Conforms to ISO3069 standards
Wear resistant with superior sealing effects
Low friction operation
Easy replacement and maintenance
Customized manufacturing available
Quality management system certified
Professional packaging
Wide industrial application range
Technical drawings provided for mass production
Operating Limits
Parameter
Specification
Shaft Diameter
20-80mm
Pressure
0-1.2 MPa
Temperature
-30°C to 180°C
Sliding Velocity
3000 rpm
Material Specifications
Component
Materials
Rotary Ring
Car / SiC / TC / Ceramic
O-Ring
EPDM, NBR, AFLAS, Kalrez, PTFE
Spring and Metal Parts
SUS304, SUS316, Titanium, 904L
Stationary Ring
Car / SiC / TC / Ceramic
Industrial Applications
Water and waste water technology
Chemical industry
Refining technology
Dirty, abrasive and solid containing media
Fugitive hydrocarbons (no API seal!)
Sticky and stringy media
Chemical standard pumps
Sewage pumps
Shipping & Payment Terms
Port of Loading: Shanghai
Shipping Method: DHL, UPS, FEDEX, TNT, etc
Payment Terms: T/T, Western Union, Money Gram
Our Services
OEM/ODM orders available
Customized mechanical seals according to your drawings or requirements
Small quantity orders accepted
Excellent quality with competitive pricing
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter,Trading Company,Seller
Year Established:
1992
Total Annual:
10milion-15milion
Employee Number:
80~100
Ecer Certification：
Verified Supplier
JIAXING BURGMANN is a professional manufacturer of mechanical seal for pump and autoclave used in the mining, industry, agriculture, flange, rubber ring, bushing, hard alloy and Sic. We are specialized in producing Burgmann series seals.
We have over 20 years production experience, wit... JIAXING BURGMANN is a professional manufacturer of mechanical seal for pump and autoclave used in the mining, industry, agriculture, flange, rubber ring, bushing, hard alloy and Sic. We are specialized in producing Burgmann series seals.
We have over 20 years production experience, wit...
