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NINGBO MIAOYU MACHINERY TECHNOLOGY CO., LTDNINGBO MIAOYU MACHINERY TECHNOLOGY CO., LTD

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John crane replacement

John Crane PTFE Mechanical Oil Seal

John Crane 8B1 8B2 Mechanical Seal Replacement
John Crane 8B1 8B2 Mechanical Seal Replacement Copy
John Crane 8B1 8B2 Mechanical Seal Replacement Copy
thumb John Crane 8B1 8B2 Mechanical Seal Replacement
John Crane 8B1 8B2 Mechanical Seal Replacement Copy
John Crane 8B1 8B2 Mechanical Seal Replacement Copy

John Crane PTFE Mechanical Oil Seal

• Low Friction PTFE: Reduces power consumption and heat generation.

• Composite Design: Uses a PTFE sealing lip or wedge integrated into the compact Type 6 metal shell.

Model:8B-1
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Key Features

• Oil & Chemical Special: A Type 6 geometry seal upgraded with PTFE sealing elements for superior oil and additive resistance.

• Synthetic Oil Ready: Standard rubber (NBR) swells in some synthetic oils. PTFE is inert, making this ideal for modern synthetic lubricants.

• Compact: Fits the extremely short working length of the Type 6 standard.al



Technical Specs

Materials

Mediums

Petroleum, chemical solvents, medium corrosion.

Stationary Ring

Ceramic/Sic/TC

Temperature

30℃ to 200℃

Rotary Ring

Carbon/Sic/TC

Pressure

≤2.5MPa

Secondary Seal

NBR/EPDM/Viton

Speed

≤25m/s

Spring and Metal Part

Stainless Steel


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Product Specifications

Inch Shaft Size Size Code D1 D2 D3 L1 L3 D7 L4
0.625 0158 15.87 12.7 30.80 27.0 7.5 25.60 7.90
0.750 0191 19.05 15.9 34.00 30.0 7.8 31.95 10.30
0.875 0222 22.22 19.1 37.20 32.0 8.0 35.12 10.30
1.000 0254 25.40 22.2 40.30 33.0 8.0 38.30 10.30
1.125 0286 28.58 25.4 43.40 35.0 7.9 41.48 11.15
1.250 0317 31.75 28.6 48.30 35.0 7.9 44.65 11.15
1.375 0349 34.93 28.6 51.30 37.0 8.7 44.65 11.15
1.500 0381 38.10 31.8 54.50 37.0 8.7 47.83 11.15
1.625 0412 41.28 34.9 60.80 45.0 8.7 51.00 11.15
1.750 0444 44.45 38.1 64.00 45.0 9.5 54.18 11.15
1.875 0476 47.62 41.3 67.20 45.0 9.5 60.53 12.75
2.000 0508 50.80 44.5 70.40 45.0 9.5 63.70 12.75
2.125 0539 53.98 47.6 76.70 52.0 11.1 66.88 12.75
2.250 0571 57.15 50.8 79.90 52.0 11.1 70.05 12.75
2.375 0603 60.33 54.0 83.10 52.0 11.1 76.40 14.33
2.500 0635 63.50 57.2 86.20 52.0 11.1 79.58 14.33
2.625 0666 66.68 60.3 89.40 52.0 11.1 82.75 14.33
2.750 0698 69.85 63.5 92.60 52.0 11.1 85.93 14.33
2.875 0730 73.03 66.7 95.80 52.0 11.1 85.96 15.93
3.000 0762 76.20 69.9 97.30 52.0 11.1 89.10 15.93
3.125 0793 79.38 73.0 100.50 52.0 11.1 95.45 15.93
3.250 0825 82.55 76.2 105.30 52.0 14.3 98.63 19.84
3.375 0857 85.73 79.4 108.50 52.0 14.3 101.80 19.84
3.500 0889 88.90 82.6 111.60 52.0 14.3 104.98 19.84
3.625 0921 92.08 85.7 114.80 52.0 14.3 108.15 19.84
3.750 0953 95.25 88.9 118.00 52.0 14.3 111.33 19.84
3.875 0984 98.43 92.1 121.20 52.0 14.3 114.50 19.84
4.000 1016 101.60 95.3 124.30 52.0 14.3 117.68 19.84



Workshop

This workshop is equipped with professional processing equipment and integrated with standardized material warehousing management, enabling a one-stop production process from precision machining to finished product delivery. It ensures part machining accuracy and production efficiency, meeting various high-specification manufacturing requirements.


Metal Bellows Seals for High Temperature Pumps 606
Metal Bellows Seals for High Temperature Pumps 606
Metal Bellows Seals for High Temperature Pumps 606
Metal Bellows Seals for High Temperature Pumps 606



Product Research, Development and Testing

Our Product R&D and Testing focuses on optimizing seal performance through advanced simulation and material analysis. All seals undergo rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments.


R&D and Design.jpg
microscope.jpg
Light band detection.jpg
pressure test.jpg



Industry Solutions

Metal Bellows Seals for High Temperature Pumps 606
Metal Bellows Seals for High Temperature Pumps 606
Metal Bellows Seals for High Temperature Pumps 606
Metal Bellows Seals for High Temperature Pumps 606




Case Study

Gearbox Seal: A high-speed gearbox used synthetic oil that ate rubber seals. We installed this Type 6 PTFE seal. Leakage stopped, and the oil remained contaminant-free.

Testimonials

Perfect for our synthetic oil pumps. No swelling, no leaks.

—Lubrication Systems OEM



FAQs about Metal Bellows Seals for High Temperature Pumps

Q: Is Type 6 usually rubber?

A: Yes, standard Type 6 is a rubber bellow seal. This PTFE version is a specialized upgrade for fluids that attack rubber.

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    Our company is specialized in the production of sealing materials, mechanical seals , cartridge seals.

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