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

Comprehensive analysis of water pump mechanical seal: principle, selection and maintenance guide

Water Pump Mechanical Seal is the core component to ensure the efficient and safe operation of water pumps. It is widely used in industry, agriculture, municipal water supply and special fields. Compared with traditional packing seals, it has lower leakage rate, longer life and more convenient maintenance. This article will systematically introduce the structural principle, material selection, installation and maintenance and typical applications of Water Pump Mechanical Seal to help users optimize sealing performance and reduce total cost of ownership (TCO).

1. Structure and working principle of water pump mechanical seal

1.1 Basic composition

Water Pump Mechanical Seal consists of the following core components:

• Main sealing ring (dynamic ring/static ring): usually silicon carbide (SiC), tungsten carbide (WC) or graphite is used to form a friction pair to prevent medium leakage.

• Auxiliary seal: O-ring, bellows or wedge-shaped gasket to compensate for axial vibration and enhance sealing.

• Spring assembly: Provide uniform end face pressure to ensure that the sealing surface fits tightly.

• Metal structure: 316L stainless steel or Hastelloy shell, resistant to corrosion and mechanical stress.

1.2 Sealing principle

Through the precise matching of the dynamic ring and the static ring, a micron-level liquid film lubrication is formed under high-speed rotation to achieve dynamic sealing. The leakage of a typical Water Pump Mechanical Seal can be controlled at ≤5ml/h (in accordance with ISO 21049 standard), which is far better than the dripping phenomenon of the packing seal.

2. Material selection for water pump mechanical seal

Choosing the right material according to the characteristics of the medium is the key to extending the service life:

Component Recommended material Applicable working conditions

Dynamic/static ring Silicon carbide (SiC) High temperature (≤250℃), containing particles (such as sewage pump)

Auxiliary seal EPDM rubber Fresh water, neutral medium (municipal water supply pump)

Metal parts 316L stainless steel Mildly corrosive environment (cooling water pump)

Special needs PTFE bellows + FFKM seal Strong acid/alkali (chemical process pump)

Note: Seawater pumps need to use a combination of super duplex steel (S32750) housing + SiC/SiC sealing ring to resist chloride ion corrosion.

3. Installation and commissioning of water pump mechanical seal

3.1 Installation steps

1. Pretreatment

• Clean the pump shaft and seal chamber to ensure that there are no scratches or impurities.

• Check the compatibility of the Water Pump Mechanical Seal model with the pump (shaft diameter, pressure level).

2. Assembly Key

• Split seals require manual adjustment of spring compression (usually 3-4mm).

• Cartridge seals (Cartridge Type) are directly installed as a whole and do not require adjustment.

3. Commissioning and operation

• Manually turn the wheel to confirm that there is no obstruction, and test run at low speed (≤500rpm) for 30 minutes.

• Monitor the initial leakage, and there should be no visible dripping under normal circumstances.

3.2 Common Error Avoidance

• Error: Direct start without lubricating the sealing surface → Consequence: Dry friction causes the sealing ring to burst.

• Correct operation: Apply silicone-based grease or medium liquid to the sealing surface.

4. Maintenance and troubleshooting of water pump mechanical seals

4.1 Daily maintenance

• Monthly inspection: record leakage, vibration value and temperature (abnormal temperature rise may indicate failure).

• Flushing system management: Double-end seals need to maintain the isolation liquid pressure 0.1-0.2MPa higher than the pump chamber pressure.

4.2 Typical Fault Analysis

Fault Phenomenon Possible Cause Solution

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

Abnormal noise Spring breakage or medium crystallization Disassemble and replace the crystallization-resistant material seal

Sealing surface overheating Insufficient lubrication or cooling failure Check the flushing pipeline and restore the flow

4.3 Life optimization suggestions

• Clean water pump: Replace the seal every 3 years (MTBF ≥ 25,000 hours).

• Chemical pump: Shorten to 1-2 years according to the corrosiveness of the medium, it is recommended to use PTFE bellows seal.

5. Typical application scenarios of water pump mechanical seals

5.1 Municipal water supply system

• Requirements: low leakage, long life (≥ 5 years).

• Solution: EPDM rubber auxiliary seal + SiC/WC friction pair, leakage rate ≤ 3ml/h.

5.2 Industrial cooling circulation pump

• Requirements: temperature change resistance (-20℃~80℃).

• Solution: Metal bellows seal to avoid rubber aging.

5.3 Chemical process pumps

• Requirement: Corrosion resistance (pH 1-14).

• Solution: Perfluoroelastomer (FFKM) + Teflon coated spring.

5.4 Seawater lifting pumps

• Requirement: Salt spray corrosion resistance.

• Solution: Duplex steel housing + SiC/SiC sealing ring, standard Plan 32 flushing.

6. Conclusion

The performance of Water Pump Mechanical Seal directly affects the reliability and energy efficiency of the water pump system. Through reasonable selection (such as the choice of containerized and split types), precise material matching (such as PTFE for corrosive media) and standardized maintenance (regular flushing and monitoring), users can significantly reduce the failure rate and improve operational efficiency.

Recommended actions:

✅ Download the "Water Pump Mechanical Seal Selection Manual" (including working condition calculation tool)

✅ Contact engineers to obtain customized solutions (free selection service for providing media analysis reports)

1. Basic technical issues

1. Q: What is the typical lifespan of a water pump mechanical seal?

A: Standard water pump mechanical seals last 2-5 years depending on:

• Clean water applications: 3-5 years (MTBF ≥30,000 hours)

• Abrasive/saline media: 1-2 years (recommend SiC/SiC pairing)

2. Q: How does a water pump mechanical seal differ from gland packing?

A: Compared to packing:

• Water pump mechanical seals reduce leakage by 90% (≤5ml/h vs. packing’s drip loss)

• Lower friction saves 15-20% energy

• Require less maintenance (no periodic tightening)

3. Q: What’s the max pressure/temperature your seals handle?

A: Our water pump mechanical seals cover:

• Pressure: Full vacuum to 25 bar (special designs to 40 bar)

• Temperature: -40°C to +260°C (high-temp models use graphite/SiC)

2. Selection and adaptation issues

4. Q: How to choose between cartridge and component-type water pump mechanical seals?

A: Key factors:

• Cartridge seals: Pre-assembled, 90% faster installation (ideal for maintenance crews)

• Component seals: Lower upfront cost (suits OEMs with skilled technicians)

5. Q: Which materials suit seawater applications?

A: For seawater water pump mechanical seals, we recommend:

• Seal faces: Silicon carbide (SiC) vs. SiC

• Metal parts: Super duplex stainless steel (UNS S32750)

• Elastomers: EPDM or FKM

6. Q: Can your water pump mechanical seals handle slurries?

A: Yes! Solutions include:

• Hard-faced seal rings (WC/WC for ≤30% solids)

• External flush systems (API Plan 32) to prevent clogging

7. Q: Are FDA-compliant water pump mechanical seals available?

A: Yes, our FDA-grade water pump mechanical seals feature:

• Ceramic/alumina seal faces

• Medical-grade EPDM or silicone elastomers

• Lubricants meeting NSF H1 standards

3. Installation and maintenance issues

8. Q: What tools are needed to install a water pump mechanical seal?

A: For cartridge-type water pump mechanical seals, only standard wrenches are needed. We provide:

• Step-by-step multilingual installation videos

• Torque specifications for all bolt sizes

9. Q: How to confirm proper spring compression during installation?

A: For component seals:

• Measure initial spring length (refer to datasheet)

• Compress to 3-4mm (clean water) or 4-5mm (viscous media)

• Pro tip: Our cartridge seals eliminate this step!

10. Q: Why does my new water pump mechanical seal leak immediately?

A: Common causes:

• ❶ Transport clips not removed (60% of cases)

• ❷ Incorrect direction of rotation (check pump vs. seal markings)

• ❸ Damaged O-rings during installation

11. Q: How often should water pump mechanical seals be inspected?

A: Recommended intervals:

• Clean water: Annual visual check + leakage monitoring

• Harsh conditions (chemicals/abrasives): Quarterly inspections

4. Troubleshooting issues

12. Q: What causes premature failure of water pump mechanical seals?

A: Top 3 reasons we see:

• Dry running (>5 minutes without fluid)

• Misalignment (pump shaft runout >0.05mm)

• Chemical attack on elastomers (verify media compatibility)

13. Q: How to diagnose seal failure from leakage patterns?

A: Quick guide:

• Steady droplets: Worn seal faces

• Sudden gushing: Spring/O-ring failure

• Crystallized deposits: Chemical incompatibility

14. Q: Can a water pump mechanical seal be repaired, or must it be replaced?

A: Cartridge seals are replacement-only. Component seals may allow:

• Replacing individual parts (if faces are undamaged)

• Cost-benefit tip: Labor often exceeds seal cost → recommend full replacement

5. Business service issues

15. Q: What’s your lead time for water pump mechanical seals?

A: Standard models:

• 7-10 days ex-stock (EU/US warehouses)

• 15-20 days for customized seals (e.g., special materials/sizes)

16. Q: Do you provide installation training onsite?

A: Yes! Our engineers can:

• Conduct hands-on training at your facility

• Audit existing installations (leakage/energy efficiency reports)

17. Q: What’s included in your warranty for water pump mechanical seals?

A: 24-month warranty covers:

• Material defects

•Premature wear under specified conditions

*Exclusions: Dry running, incorrect installation, chemical attack

18. Q: Can you match competitors’ prices for equivalent water pump mechanical seals?

A: We guarantee:

• 100% material traceability (vs. generic seals)

• 30% longer warranty than industry average

• Price-match policy (provide competitor’s quote for verification)

6. Upgrade and optimization issues

19. Q: How to retrofit old pumps with modern water pump mechanical seals?

A: 3-step process:

1. Share pump specs (shaft diameter, flange type)

2. We engineer adapter sleeves if needed

3. Provide retrofit kit with alignment tools

20. Q: What’s the ROI of upgrading to premium water pump mechanical seals?

A: Case study data shows:

• 40% reduction in unplanned downtime

• 18% lower energy costs (ef