John Crane Type 2 Elastomer Bellows Mechanical Seal Replacement
Key Features
• Short Working Length: A compact version of the Type 1 with shorter installed length. The John Crane Type 2 seal equivalent fits pumps where the standard Type 1 is too long – no housing modification required.
• Positive Drive: Uses the same reliable elastomer bellow drive principle as the original elastomer bellows seal, absorbing shaft end-play and misalignment while transmitting torque through the bellow drive band and notches.
• Cost-Effective: This John Crane Type 2 seal replacement delivers identical performance to the OEM at a fraction of the cost. Available in metric (10–100mm) and inch sizes with Carbon/Ceramic/SiC/TC face options and NBR/Viton/EPDM elastomers.
• Non-Clogging Spring: Large single coil spring is mounted externally and resists fouling from hard water scale or light slurries – more reliable than enclosed multi-spring designs in dirty water service common to elastomer bellow mechanical seal applications.
• Shaft Protection: The elastomer bellow covers the shaft area under the seal, protecting against corrosion and fretting – a key advantage over packed glands and open O-ring seals.
Technical Specs | Materials | ||
Mediums | Water, oil and weakly-corrosive mediums | Stationary Ring | Ceramic/Sic/TC |
Pressure | ≤1.4MPa | Rotary Ring | Carbon/Sic/TC |
Temperature | -20℃ to 120℃ | Secondary Seal | NBR/EPDM/Viton |
Speed | ≤15m/s | Spring and Metal Part | Stainless Steel |
Product Specifications
| Metric Shaft Size D1 | Size Code | D3 | D7 | L1 | L4 |
| 16 | 0160 | 34.00 | 30.00 | 25.20 | 8.00 |
| 18 | 0180 | 36.80 | 32.00 | 25.20 | 8.00 |
| 20 | 0200 | 38.80 | 34.00 | 25.20 | 8.00 |
| 22 | 0220 | 41.50 | 36.00 | 25.20 | 8.00 |
| 25 | 0250 | 44.80 | 39.00 | 26.20 | 8.00 |
| 28 | 0280 | 48.50 | 43.00 | 26.20 | 8.00 |
| 30 | 0300 | 52.00 | 48.00 | 26.20 | 8.00 |
| 35 | 0350 | 57.00 | 53.00 | 30.20 | 10.00 |
| 40 | 0400 | 67.00 | 58.00 | 34.20 | 10.00 |
| 45 | 0450 | 73.00 | 63.00 | 36.20 | 10.00 |
| 50 | 0500 | 79.00 | 68.00 | 41.20 | 10.00 |
| 55 | 0550 | 84.00 | 73.00 | 41.20 | 12.00 |
| 60 | 0600 | 90.00 | 79.00 | 41.20 | 12.00 |
| 65 | 0650 | 98.50 | 86.00 | 49.20 | 12.00 |
| 70 | 0700 | 103.50 | 91.00 | 52.20 | 12.00 |
| 75 | 0750 | 110.50 | 96.00 | 52.20 | 12.00 |
| 80 | 0800 | 120.00 | 105.00 | 56.20 | 14.00 |
| 85 | 0850 | 125.00 | 110.00 | 56.20 | 14.00 |
| 90 | 0900 | 132.00 | 115.00 | 56.20 | 14.00 |
| 95 | 0950 | 137.00 | 120.00 | 56.20 | 14.00 |
| 100 | 1000 | 144.00 | 125.00 | 62.20 | 14.00 |
| 110 | 1100 | 157.00 | 135.00 | 62.20 | 16.00 |
| 120 | 1200 | 169.50 | 145.00 | 72.20 | 16.00 |
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 John crane type 2 seal machining accuracy and production efficiency, meeting various high-specification manufacturing requirements.
Product Research, Development and Testing
Our Product R&D and Testing focuses on optimizing seal performance through advanced simulation and material analysis. All John crane type 2 seals undergo rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments.
Industry Solutions
Case Study
Heating Systems: A district heating provider needed a short seal for older circulation pumps. The Type 1 was too long. Our John crane type 2 seal fit perfectly, restoring the pumps to service without machining the housing.
Testimonials
Hard to find these short John crane type 2 seal seals anymore. Glad you stock them. They save us from replacing the whole pump.
—HVAC Technician, NYC
FAQs about John Crane Type 2 Replacement Seal
Q: How do I distinguish Type 1 from Type 2?
A: The main difference is the installed working length. Type 2 is significantly shorter. Measure the distance from the face to the back of the spring to confirm.
Q: What are the standard operating limits for this John crane type 2 seal?
A: The standard Type 2 replacement operates within a temperature range of -40°C to +150°C(extendable to 200°C with FKM/Viton) and a maximum pressure of 1.0 MPa (10 bar). For higher-pressure applications (up to 29 bar), a balanced Type 2B configuration is recommended.
Q: Do you supply John Crane Type 2 seal replacements as a manufacturer with factory direct price?
A: Yes. MIAOYU is an ISO 9001 certified manufacturer of elastomer bellow mechanical seals in China. We supply direct to pump distributors, OEMs and MRO buyers at factory prices with OEM/private label options and fast global shipping.
Our company is specialized in the production of sealing materials, mechanical seals , cartridge seals.
E-mail: gechacha@aliyun.com
Mobile: +86-18758835650
WhatsApp: +86-18758835650
Add: No8-2, Jinsha road Yuelin Street, Fenghua District, Ningbo, Zhejiang
