Size

custom

Other Attributes

Place of Origin	Zhejiang, China
Brand Name	CF
Model Number	Flygt Pump Seal

Supply Ability

Supply Ability

10000 Piece/Pieces per Month

Product Details

1) Heat shock stablity

2) chemical corrosion-resistant

3) High temper-endure(up to 1650°)

4) Wearing/corrosion/oxidation resistant

5) Highly performance of mechanical strength

6) Cleaning or etching the hardest sub-surfaces

7) Used for grinding, lapping, and wire saw cutting as well as abrasive blasting

Material And Component Codes

Description	Material	Material Feature & Suitable Scope
Rotary /Stationary Face	Carbon	Resistant against: erosive heat. suitable for water and oil medium.
	Ceramic	Resistant against:shore hardness,abrasion. Suitable for dusted water and oil.
	Silicon Carbide	Resistant against:heat,abrasion,erosive. Suitable for industrial pumps, submersible pump sewage pump etc
	Tungsten carbide	Resistant against:heat,abrasion,erosive. Suitable for industrial pumps, submersible pump sewage pump etc
Bellow Cup gasket Oring	NBR	Resistant against:pressure,abrasion,high elasticity and mechanical strength. Suitable for water and Oil Under -20°C-120°C
	EPDM	Resistant against:heat freeze,chemical reagent depending. Suitable for water and Oil Under -40°C-150°C
	MVQ	Resistant against:heat, oil, reagent, medicine, acetone.Suitable for high temperature. Hydraulic equipment and vacum equipment Suitable for erosive medium under  -20°C-180°C
	ECO	Resistant against:ozone aging merely ocetum, ammomia ethanol. Suitable for medium -40°C-150°C
	SUS304 SUS316	Resistant against: freon, rock oil. Suitable for medium -30°C-130°C
Retainer driver ring\spring Spring seat	SUS304 SUS316	Resistant against: abrasion, antirust of feature

Xylem Flygt Pumps	Shaft Size	Seal Code
2610、2620、2630、2640、4610&4620	20mm	FS20
2660、4630&4640	25mm	FS25
2670、3153、5100.210、5100.211、 5100.220&5100.22	35mm	FS35
3171、4650、4660、5100.250、5100.251、 5100.260&5100.261	45mm	FS45
3202、4670、4680、5100.300、5100.310、 5150.300&5150.310	60mm	FS60
3301、5150.350&5150.360	90mm	FS90

Xylem Flygt Pumps	Shaft Size	Seal Code
2610、2620、2630、2640、4610&4620	20mm	FSVC20
2660、4630&4640	25mm	FSVC25
2670、3153、5100.210、5100.211、 5100.220&5100.22	35mm	FSVC35
3171、4650、4660、5100.250、5100.251、 5100.260&5100.261	45mm	FSVC45
3202、4670、4680、5100.300、5100.310、 5150.300&5150.310	60mm	FSVC60
3301、5150.350&5150.360	90mm	FSVC90

How to choose What you want

Let me Help you find it what mechanical seal do you want

The First step: Do you know Type name?  you can choose from the list below.

The Second Step: Do you know what material do you want? Choose from the list below.

The Third step: Do you know what shaft size?

If you don’t know any, please do not hesitate to ask us, we will help you to find out the best way.

Contact Us Now

Why Choose Us

1. Plug & Play

Core selling point: pre-assembly, pre-adjustment, reducing installation time by 90%

Customer pain point: traditional split seals require on-site alignment and require professional technicians to operate

Data support: Industry reports show that installation costs can be reduced by 40%

2. Full-condition adaptability

Outstanding performance:

Pressure range: -0.1MPa to 4.0MPa (covering most industrial scenarios)

Temperature adaptability: -40℃ to +220℃ (including hot fluid conditions)

Shaft diameter compatibility: 20mm-120mm (adaptable to mainstream pump types)

Application case: Middle East seawater desalination project with a record of 12,000 hours of continuous operation

3. Modular maintenance (patented design)

Innovation:

Seal components can be replaced without disassembling the pump

Standard interface design, compatible with mainstream pump factory models

Cost advantage: Maintenance time is shortened by 75%, reducing production stoppage losses

4. Triple leakage protection system

Technical highlights:

Main seal ring: Silicon carbide/SiC pairing (wear resistance grade HV2500)

Secondary seal: PTFE wedge structure

Emergency protection: Leak sensor interface (optional)

Certification endorsement: Meets API 682/ISO 21049 standards

5. Long-term economic benefits

TCO comparison:

Service life: 3-5 years under normal working conditions (2-3 times longer than traditional seals)

Energy consumption optimization: Friction power consumption is reduced by 15-20%

Visual evidence: Provide life cycle cost calculator tool

Professional Analysis of Cartridge Type Mechanical Seal for Multistage Centrifugal Pumps: Design, Application and Maintenance Guide

1. Overview

Cartridge Type Mechanical Seal for Multistage Centrifugal Pumps is a highly integrated sealing solution designed for high pressure, high temperature and harsh working conditions. Compared with traditional split seals, its pre-assembled and modular structure greatly simplifies the installation and maintenance process, significantly improving equipment reliability and operating efficiency.

This article will provide professional analysis from the aspects of structural design, material selection, installation method, maintenance points and typical applications to help users optimize the performance of the sealing system.

2. Core structure and design advantages

2.1 Integrated design (Plug & Play)

Cartridge type mechanical seals are factory pre-installed and dynamically balanced and calibrated. All key components (such as dynamic rings, static rings, springs, O-rings, etc.) are encapsulated in a single unit. The advantages include:

• Installation time is reduced by 90%: no need to adjust the compression or alignment on site, direct overall installation.

• Eliminate human error: Avoid leakage or early failure of traditional seals due to improper installation.

• Strong compatibility: Standardized interface adapts to API 682/ISO 21049 standard pump types, with shaft diameters covering 20mm-120mm.

2.2 Triple seal protection system

1. Main seal ring: Silicon carbide (SiC) or cemented carbide (WC) pairing, wear-resistant (hardness ≥ HV2500), suitable for particle-containing media.

2. Secondary seal: PTFE wedge structure or elastomer auxiliary seal to compensate for axial movement.

3. Leakage monitoring interface: Optional sensor to monitor the sealing status in real time and prevent sudden failures.

3. Key material selection

Choosing the seal material according to the characteristics of the medium is the key to ensure long life:

Components Common materials Applicable working conditions

Dynamic/static ring Silicon carbide (SiC), cemented carbide (WC) High temperature (≤220℃), containing solid particles (such as mining slurry)

Auxiliary seal FKM fluororubber, EPDM EPDM Acid and alkali resistance, solvent (chemical process pump)

Metal parts 316L stainless steel, Hastelloy Desalination, high salt spray environment (such as desulfurization pump)

Note: Corrosive media (such as HCl, NaOH) require PTFE-coated springs or perfluoroether rubber (FFKM).

4. Installation and commissioning guide

4.1 Installation steps

1. Pretreatment:

• Clean the pump shaft and seal chamber to ensure that there are no burrs or residual particles.

• Check the matching of the seal model and the pump (shaft diameter, pressure level).

2. Assembly:

• Insert the cartridge seal as a whole into the pump shaft without disassembling the components.

• Tighten the fixing bolts evenly to avoid deformation of the sealing surface due to eccentric loading.

3. Debugging:

• Manually turn the machine to confirm that there is no obstruction, and observe the leakage after starting (standard ≤5ml/h).

4.2 Common Error Avoidance

• Error: Direct operation without removing the positioning clip → Consequence: Dry grinding and damage of the sealing surface.

• Correct operation: The transportation fixings (such as positioning pieces) must be removed after installation.

5. Maintenance and troubleshooting

5.1 Preventive maintenance

• Regular inspection: Monitor leakage, vibration and temperature every 3 months (abnormal temperature rise may indicate seal failure).

• Lubrication management: Double-end seals must ensure that the isolation fluid pressure is higher than the pump chamber pressure (+0.1~0.2MPa).

5.2 Quick Replacement Process

Cartridge seals support maintenance without disassembly of the pump:

1. Stop the pump and release the pressure.

2. Disassemble the old seal assembly (keep the bolt positioning data).

3. Install the new seal unit and resume operation (the whole process ≤ 1 hour).

5.3 Typical Fault Analysis

Fault Phenomenon Possible Cause Solution

Continuous leakage Sealing surface wear or O-ring aging Replace the sealing unit

Abnormal vibration Spring positioning failure or medium crystallization Flush the pipeline to clear or replace the material

6. Typical application scenarios

6.1 High-pressure boiler feed pump

• Challenge: high temperature (≥150℃), high pressure (≤4.0MPa).

• Solution: SiC/WC sealing ring + high-pressure balanced design.

6.2 Seawater desalination high-pressure pump

• Challenge: chloride ion corrosion, salt particle wear.

• Solution: Super duplex steel shell + corrosion-resistant coating sealing surface.

6.3 Chemical Process Pumps (Acid/Alkali Media)

• Challenge: Extreme pH value (strong acid/alkaline).

• Solution: PTFE bellows seal + FFKM auxiliary seal.

7. Conclusion

Multistage centrifugal pump cartridge mechanical seals have become an ideal choice for modern industrial pumps through modular design, high-reliability materials and intelligent monitoring. Its core value lies in:

✅ Reduce total cost of ownership (TCO): life is extended to 3-5 years, maintenance costs are reduced by 50%+

✅ Improve safety: leakage risk is controllable and meets API/ISO international standards

✅ Adapt to complex working conditions: customized solutions are available from deep well mining to nuclear power cooling

Recommendation: Jointly select with the seal supplier for specific application media and pressure parameters to maximize performance advantages.

---

For more detailed working condition adaptation solutions or technical parameters, please contact the professional engineer team for customized support.

The following are 20 frequently asked questions and professional response templates from overseas customers regarding multi-stage centrifugal pump cartridge mechanical seals, covering technology, selection, service and other dimensions.

I. Technical parameter questions

1. Q: What is the maximum pressure and temperature range that can be tolerated?

A: The standard model has a pressure resistance of ≤4.0MPa and a temperature range of -40℃~220℃ (depending on the material combination). Special designs can be provided for high-temperature conditions (such as boiler feed water pumps), and specific medium temperature and pressure curves must be provided.

2. Q: Is it suitable for media containing solid particles?

A: Yes, a hard pairing of silicon carbide (SiC) to silicon carbide is recommended, which can withstand slurries with a solid content of ≤15% (particle size ≤50μm). It is recommended to add a flushing solution (such as API Plan 32) for extreme conditions.

3. Q: How much can the leakage rate be reduced compared to split seals?

A: The leakage rate of the cartridge seal is ≤5ml/h (within 30 minutes of dry operation), which is more than 50% higher than that of the traditional split seal (usually 10-20ml/h), and the long-term stability is better.

4. Q: Does it support bidirectional rotation?

A: The standard model only supports unidirectional rotation (the pump direction must be consistent with the seal mark), but a bidirectional balanced design can be provided (the working conditions must be stated in advance).

5. Q: What is the tolerance of the radial runout of the shaft?

A: It is recommended to control it within ≤0.05mm. Excessive runout will accelerate the wear of the sealing surface (the cartridge seal has a built-in compensation spring, but the basic accuracy must be guaranteed).

2. Selection and adaptation issues

6. Q: How to confirm that the seal matches our pump model?

A: Please provide: ① Pump manufacturer and model ② Shaft diameter size ③ Flange standard (such as ISO/DIN/ANSI) ④ Medium characteristics. We have an adaptation database of mainstream pump manufacturers around the world (such as Grundfos, Sulzer).

7. Q: What material should be selected for desalination pumps?

A: Recommended solution:

• Sealing ring: reaction-bonded silicon carbide (RB-SiC)

• Metal parts: super duplex steel (UNS S32750)

• Auxiliary seal: EPDM rubber (chloride ion corrosion resistant)

8. Q: How to select a chemical pump for conveying concentrated sulfuric acid (98%)?

A: PTFE bellows structure + perfluoroether rubber (FFKM) auxiliary seal must be used, and any metal spring is prohibited (to avoid acid corrosion).

9. Q: Is there any certification for food-grade media?

A: Models certified by FDA 21 CFR and EC1935/2004 are available, and the sealing material is high-purity alumina ceramic + medical-grade silicone rubber.

10. Q: Can pumps with small shaft diameters (<20mm) be used?

A: Customizable micro cartridge seals (minimum shaft diameter 12mm), but pay attention to the upper speed limit (generally ≤3,600rpm).

III. Installation and maintenance issues

11. Q: Do special tools need to be installed?

A: Only a standard wrench is required, and the seal is pre-installed at the factory. We provide installation videos and graphic manuals (including torque value reference).

12. Q: Do I need to dismantle the pump to replace the seal?

A: No! The cartridge design supports pump replacement without disassembly (only the coupling can be removed to pull out the old seal unit).

13. Q: What precautions should be taken before the first start?

A: Three key steps:

① Confirm that the transport positioning piece has been removed

② Manually turn the wheel to check for obstruction

③ Test run at low speed (≤500rpm) for 10 minutes

14. Q: How to determine whether the seal needs to be replaced?

A: Warning signals:

• Sudden increase in leakage (>10ml/h)

• Exceeding pump vibration value (ISO 10816 standard)

• Abnormal sealing chamber temperature (more than 30℃ higher than the environment)

15. Q: How long is the maintenance cycle?

A: It is recommended to check every 12 months under normal working conditions, and shorten to 6 months under harsh working conditions (such as high temperature and particles).

IV. Service and business issues

16. Q: Can you provide on-site installation guidance?

A: We have cooperative service providers in 50+ countries around the world, and can arrange engineers for on-site support (reservation is required 72 hours in advance).

17. Q: How long is the delivery time? Is there local inventory?

A: Standard models are 7-15 days (shipped from China), and there are bonded warehouses in the United States/Germany/Middle East. Urgent orders can be delivered within 72 hours.

18. Q: How long is the warranty period? In what cases is the warranty not covered?

A: The standard warranty is 18 months, except for the following:

• Failure to install according to the manual (such as not removing the positioning piece)

• The medium exceeds the agreed parameters (such as pH <2 or >12 not declared)

• Man-made physical damage (such as hammering the sealing surface)

19. Q: Do you accept OEM customization? What is the MOQ?

A: Customization is supported (including logo, packaging, technical parameters), and the MOQ is usually 5 sets, depending on the complexity of the design.

20. Q: How to optimize procurement costs?

A: Suggestions:

① Bulk purchase (≥20 sets enjoy 15% discount)

② Choose a common model (such as ISO standard interface)

③ Participate in an annual maintenance contract (free spare parts reserve)

Reply tips

1. Data quantification: Use comparison tables/test reports to enhance persuasiveness (such as "MTBF increased from 8 months to 3 years after a customer used it").

2. Scenario-based examples: relate the problem to a specific industry (e.g. "For the sugarcane juice pump problem you mentioned, Brazilian customers used XX solution to solve the crystallization wear").

3. Active guidance: add one professional suggestion after each answer (e.g. "For your high-salt working conditions, we can also provide free material selection tools").

Professional and fast responses can significantly improve customers' technical trust in products and their willingness to purchase.