Product
FNU-45mm FS-N-U45 Upper Mechanical Seal for Flygt 2201.320/430/480/590/690
| Place of Origin | China |
| Brand | Hong Teng |
| Marketing Reference | FNU-45mm |
| Seal Reference | FS-N-U45 |
| Nominal Size | 45 mm |
| Seal Position | Upper Mechanical Seal |
| Compatible Equipment | Selected Flygt 2201.320, 2201.430, 2201.480, 2201.590 and 2201.690 variants |
| Product Type | Aftermarket replacement mechanical seal |
| Ordering Check | Confirm complete Flygt model, numerical suffix, upper seal position, old seal and dimensions before ordering. |
Product Details
The FNU-45mm / FS-N-U45 is a 45 mm upper mechanical seal supplied as an aftermarket replacement for selected Flygt 2201 equipment. It is intended for maintenance, overhaul and seal replacement where the installed upper seal configuration matches the FS-N-U45 reference.
Product Specifications
- Product Name: FNU-45mm FS-N-U45 Upper Mechanical Seal for Flygt 2201
- Marketing Reference: FNU-45mm
- Seal Code / Reference: FS-N-U45
- Nominal Size: 45 mm
- Installation Position: Upper mechanical seal
- Brand: Hong Teng
- Place of Origin: China
- Product Type: Aftermarket replacement mechanical seal
- Application: Maintenance and overhaul of selected compatible Flygt 2201 equipment
Flygt Compatibility Reference
| Flygt Model | Seal Position | Replacement Reference |
|---|---|---|
| 2201.320 | Upper | FS-N-U45 |
| 2201.430 | Upper | FS-N-U45 |
| 2201.480 | Upper | FS-N-U45 |
| 2201.590 | Upper | FS-N-U45 |
| 2201.690 | Upper | FS-N-U45 |
Do not write or identify the compatible versions simply as “2201, 430, 480, 590 and 690.” The numerical values are part of the complete Flygt model designation, such as 2201.590. The complete suffix should be recorded before seal selection.
Confirm the complete Flygt model designation, upper seal position, nominal size, old seal design and critical dimensions. A Flygt 2201 family number alone is not sufficient for final replacement confirmation.
Product Description
The FNU-45mm Flygt mechanical seal, also identified by the replacement reference FS-N-U45, is a 45 mm upper mechanical seal for selected Flygt 2201 equipment. It is supplied for maintenance and overhaul applications where the existing upper seal configuration matches this reference.
The Flygt 2201 family includes different numerical variants, so the base number “2201” should not be used alone for mechanical seal selection. Reference applications for this product include 2201.320, 2201.430, 2201.480, 2201.590 and 2201.690.
Other Flygt 2201 versions may use a different upper seal. For example, if your equipment is identified as 2201.010 or 2201.011, compare it with our FOU-45mm / FS-O-U45 upper mechanical seal rather than assuming all 45 mm upper seals in the 2201 family are interchangeable.
When the old seal reference is unavailable, dimensional verification should be used together with the equipment nameplate and installation position. Measure the shaft or sleeve, stationary component, rotating assembly and relevant working dimensions. See our mechanical seal measurement guide for the dimensions commonly required for replacement identification.
For other upper, lower and cartridge seal references, browse our Flygt replacement mechanical seals and identify the replacement from the complete equipment model whenever possible.
Flygt names, trademarks and model numbers are used only to identify compatible applications. This FNU-45mm / FS-N-U45 product is an independently manufactured aftermarket replacement mechanical seal supplied by Hong Teng and is not represented as an original Flygt product.
Application
Applications
The FNU-45mm / FS-N-U45 45 mm upper mechanical seal is intended for maintenance and replacement work on selected Flygt 2201 dewatering pump variants using a compatible upper-and-lower mechanical seal arrangement.
- Flygt 2201.320
- Flygt 2201.430
- Flygt 2201.480
- Flygt 2201.590
- Flygt 2201.690
- Dewatering pump maintenance
- Pump overhaul and mechanical seal replacement
- Repair projects based on complete model, seal position, old seal and dimensional confirmation
Important Notice
Do not identify this product only from the 2201 family number or the 45 mm nominal size. Different Flygt 2201 variants can use different mechanical seal references. Always confirm the complete numerical suffix and make sure the required component is the upper seal.
How to Confirm an FNU-45mm / FS-N-U45 Replacement
Use the following checks together before ordering. The complete Flygt model and installed seal should take priority over appearance or nominal size alone.
Record the Complete Flygt Model
Photograph the pump nameplate and record the complete model designation. Confirm whether the unit is 2201.320, 2201.430, 2201.480, 2201.590, 2201.690 or another variant rather than providing only “2201.”
Confirm the Upper Seal Position
FS-N-U45 is an upper mechanical seal reference. Do not confuse it with the lower mechanical seal fitted in the same sealing system. Photograph both components before disassembly whenever possible.
Compare the Old Seal & Dimensions
Confirm the nominal 45 mm size together with the rotating assembly, stationary component and other critical installation dimensions. Similar-looking upper mechanical seals are not automatically interchangeable.
Check Materials & Service
Confirm the existing sealing-face and elastomer materials where known and provide information about the pumped liquid and service conditions. Material suitability should be checked separately from dimensional compatibility.
Original Flygt 2201 Sealing-System Reference
Xylem technical data for the Flygt 2201.590 identifies the equipment as a dewatering pump using a double mechanical shaft seal and distinguishes inner and outer mechanical face seals. This supports the importance of identifying the correct seal position rather than selecting a replacement only from the pump family or shaft size.
The original Flygt technical data is provided only to explain the equipment sealing-system concept. Its materials, operating limits and performance data should not be interpreted as guaranteed specifications for the Hong Teng FS-N-U45 replacement product.
Frequently Asked Questions
Common questions about identifying the FNU-45mm / FS-N-U45 upper mechanical seal.
What is the FNU-45mm mechanical seal?
FNU-45mm is Hong Teng’s marketing reference for the FS-N-U45 45 mm upper mechanical seal. It is supplied as an aftermarket replacement for selected Flygt 2201 applications where the existing upper seal configuration matches this reference.
Which Flygt models use the FS-N-U45 upper seal?
Reference applications include selected Flygt 2201.320, 2201.430, 2201.480, 2201.590 and 2201.690 variants. Always confirm the complete pump model, upper seal position and old seal before ordering.
Does every Flygt 2201 pump use the FNU-45mm upper seal?
No. Different Flygt 2201 variants can use different mechanical seal configurations. For example, some 2201.010 and 2201.011 applications are associated with a different upper seal reference. The complete numerical suffix should therefore be checked before selection.
Is FS-N-U45 an upper or lower mechanical seal?
FS-N-U45 is an upper mechanical seal reference. Selected Flygt 2201 equipment uses a multi-seal arrangement, so the upper and lower sealing components should be identified separately.
Can I select this Flygt seal using only the 45 mm size?
No. The 45 mm nominal size is only one identification parameter. The complete Flygt model, numerical suffix, upper seal position, old seal design and relevant dimensions should also be checked.
What information should I send before ordering?
Please provide the complete Flygt pump model, pump nameplate photo, photos of the removed upper and lower seals, available dimensions and material information. These details help confirm replacement compatibility before shipment.
Is this an original Flygt mechanical seal?
No. This product is an independently manufactured aftermarket replacement mechanical seal supplied by Hong Teng. Flygt trademarks and model references are used only for compatibility identification.
Company Profile
Dongguan Hongteng Seals Co., Ltd. Company was established in 1996. The company has passed the GB/T19001-2016 idt ISO9001:2015 quality management system certification. The company has world-renowned pump mechanical seals, axe mechanical seals, fluid mechanical seals, metal bellows mechanical seals, container mechanical seals, rubber bellows mechanical seals, O-ring seals, PTFE mechanical seals, stainless steel oil seals, skeleton oil seals, hydraulic oil seals, automotive water seals and various mechanical seal materials, hard alloys, silicon carbide, carbon graphite, alumina, etc. There are Guangzhou Port, Shenzhen Port, and Foshan Port in the surrounding area, with developed and efficient logistics. The company has a stock warehouse of over 2000 square meters, which can efficiently and quickly deliver goods.
Production of Workshop
Exhibiton
Packing And Shipping
Customer Reviews
frequently asked questions
01. Q: Are you a factory or a trader?
A: We are a production factory and also sell on our own
02. Q: Where is your factory located?
A: Our factory is located in Dongguan City, and the nearest ports are Guangzhou Port and Shenzhen Port. Other ports can also be selected according to customer needs
03. Q: What is your delivery time in days?
A: For products in stock, we can ship immediately when receive the payment; For other projects, we need 10-25 days for mass production
04. Q: Do you provide free samples?
A: We usually do not provide free samples, and the sample fee can be deducted after the second order
05. Question: What is the most commonly used mode of transportation
A: The weight and size of mechanical seals are relatively small, and air freight, sea freight, and express delivery are usually the preferred transportation methods for customers.
06. Q:What payment methods do you accept?
A: For products in stock, 100% advance payment is required and immediate shipment will be made upon receipt of payment. For customized products, a 30% advance payment and a 70% payment must be made before the order is shipped. We accept T/T, Western Union, and also welcome customers to make payments through Alibaba
07. Q: Can you provide me with customized production
A: Yes, we can customize products and welcome OEM
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