Single Spring Mechanical Shaft Seal 108U
The Type 108U is a heavy-duty single spring mechanical seal designed for robust performance in a wide range of industrial applications. Its cartridge design simplifies installation and replacement, ensuring correct positioning without specialized tools. The seal utilizes a high-grade carbon stationary face and a precision-ground rotating face, typically from silicon carbide or tungsten carbide, to ensure reliable sealing under demanding conditions. This compact and versatile unit is engineered for use in pumps, mixers, and other rotary equipment handling everything from water and chemicals to mild abrasives.
Jiaxing Burgmann Mechanical Seal offers the 108U Single Spring Seal, a top - notch solution for chemical pumps.
This seal has a single - end face design, which simplifies installation and maintenance. The single - spring mechanism provides stable elastic force, ensuring a tight seal with a fixed rotation direction for optimal performance.
It can handle shaft diameters from 18mm to 100mm, operates at temperatures between - 10°C and 150°C, and withstands a linear velocity up to 15m/s, adapting to various chemical processes.
Material selection is outstanding. The rotating ring uses wear - and corrosion - resistant SiC or TC. The stationary ring offers choices like Carbon, SiC, and TC. Auxiliary seals come in materials such as NBR, EPDM, FFKM, Aflas, and PTFE for chemical compatibility. Springs and metal parts are made of high - quality stainless steel (SS304, SS316) for durability.
Suitable for transporting acids, alkalis, and organic solvents in the chemical industry, as well as applications in water treatment and food sectors, the 108U Single Spring Seal ensures reliable, long - term sealing, protecting your processes and equipment.
Features:
- Single face plus framework oil seal
- Independent direction of rotation.
- Multi-springs do not contact with the medium against blocking.
- Easy for installation and maintenance.
- Excellent wear-resistant friction pairs.
- Double-balanced structure on the side of the medium.
- Short inboard length.
- Compensated by the mating ring.
- Low-pressure circulating water is introduced between the primary seal and oil seal, which improves the lubrication of the first seal and carries off the friction heat and leakage.
Operating Limited:
| Shaft diameter |
18~100mm |
| Pressure |
0~0.8Mpa |
| Temperature |
-10~150°C |
| Slidingvelocity |
3000r/mins |
Material:
| Rotary Ring |
Car / SIC/TC/Cer |
| O-Ring |
, EPDM, NBR, AFLAS, Kalrez,PTFE |
| Spring and Metal Parts |
SUS304, SUS316 |
| Stationary Ring |
Car / SIC /TC/Cer |
Advantages:
- Spring unit averted from the product so no sticking and clogging of the springs
- Safe operation (no fractures) because of seal face locking by square pin
- Suitable for pressure reversals
- Operation in vacuum without additional seat locking possible
- No damage of the shaft by a dynamically loaded O-Ring
- Small installation sizes
- Best suitable for conversions, no adaptations of the pump
- Insensitive to solid containing and abrasive media
- Advantages of a balanced seal even with plain shafts
- Insensitive to shaft movements because of the stationary design
Application:
- 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 are available for our factory
- Accept customized mechanical seals according to your drawing or requirements
- Small quantity is accepted
- Provides excellent quality with competitive price
Q1: What are the primary design advantages of the single-spring mechanism in the 108U seal?
A1: The large, single-spring design provides several key benefits over multiple small springs. It offers a more consistent and uniform closing force, is less susceptible to clogging from crystallized fluids or particulate matter, and simplifies both maintenance and inspection procedures. This makes it particularly robust in applications with poor media quality.
Q2: For which specific fluid services is the 108U seal most recommended?
A2: The 108U is engineered for a broad range of moderate-duty applications. It is well-suited for handling water, light oils, non-abrasive process fluids, and mild chemical solutions. The specific fluid compatibility is ultimately determined by the selected face material combination (e.g., Carbon/Ceramic for general service, Silicon Carbide/Silicon Carbide for more demanding conditions) and the elastomer of the bellows.
Q3: Is the 108U designed as a cartridge or a component seal?
A3: The 108U is typically supplied as a component seal, also known as a "pusher-type" seal. It requires precise installation of individual parts onto the shaft. For applications requiring easier maintenance and reduced installation error, a custom cartridge version can often be specified, which incorporates all components into a single, pre-assembled unit.
Q4: What is the function of the elastomeric bellows in this seal design?
A4: The elastomeric bellows serves a dual purpose. Primarily, it acts as a static seal, preventing leakage along the shaft. Secondly, it provides flexibility to accommodate minor axial shaft movement, thermal expansion, and face wear, while also transmitting the spring force to the seal faces.
Q5: How does the 108U perform in high-pressure versus high-speed applications?
A5: The single-spring design is generally more effective in medium-pressure applications. For very high rotational speeds, a multi-spring seal might be preferred as it can provide a more balanced closing force. The 108U's suitability for a specific pressure/speed (PV value) range should be verified against the manufacturer's performance curves for the chosen materials.
Q6: What are the common failure modes to monitor for with this seal type?
A6: Typical failure indicators include:
-
Spring Hang-up: The spring becomes clogged with solids, preventing it from compensating for face wear.
-
Bellows Degradation: Chemical attack or ozone cracking of the elastomer compromises the static seal.
-
Face Fretting: Micro-motion between the seal face and its holder can cause wear, known as fretting.
Q7: Can the 108U be used in a double seal arrangement for hazardous fluid containment?
A7: Yes, the 108U can be configured in a tandem or double (back-to-back) arrangement. In this setup, a pressurized or non-pressurized barrier fluid is introduced between two seals, providing a secondary containment layer for handling hazardous, abrasive, or volatile fluids, thereby significantly enhancing sealing safety.
Q8: What key parameters must be specified when ordering a 108U seal replacement?
A8: To ensure correct replacement, always specify:
-
Shaft Diameter and Bore Diameter
-
Seal Width
-
Face Material Combination (e.g., SiC/Carbon)
-
Elastomer Type (e.g., Nitrile, FKM/Viton)
-
Overall Seal Length
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