• PTFE Backup Rings: Many models include PTFE backup rings behind the O-ring to prevent extrusion at high pressures.
• Multi-Spring Distribution: Uses multiple small springs to provide even face loading, ensuring a compact axial length suitable for modern centrifugal pumps.
Key Features
• Classic Design: We offer high-quality aftermarket replacements for the entire range of John Crane O-ring pusher seals (e.g., Type 8-1, Type 9, Type 8B1).
• High Pressure & Versatility: Known for their ability to handle higher pressures than bellows seals due to the robust pusher design.
• Balanced Options: Available in balanced (Type 8B1) configurations for high-pressure applications.
Technical Specs | Materials | ||
Mediums | Water, oil, acids, alkali, etc. | Stationary Ring | Carbon/Sic/TC |
Pressure | ≤1.2MPa | Rotary Ring | Carbon/Sic/TC/SUS304 |
Temperature | -30℃ to 200℃ | Secondary Seal | NBR/EPDM/Viton |
Speed | ≤18m/s | Spring and Metal Part | Stainless Steel |
Product Specifications
| Metric Shaft Size D1 | Size Code | D3 | D7 | L1 | L4 |
| 14 | 0140 | 25.00 | 25.00 | 25.00 | 10.00 |
| 16 | 0160 | 27.00 | 27.00 | 25.00 | 10.00 |
| 18 | 0180 | 33.00 | 33.00 | 26.00 | 11.50 |
| 20 | 0200 | 35.00 | 35.00 | 26.00 | 11.50 |
| 22 | 0220 | 37.00 | 37.00 | 26.00 | 11.50 |
| 24 | 0240 | 39.00 | 39.00 | 28.50 | 11.50 |
| 25 | 0250 | 40.00 | 40.00 | 28.50 | 11.50 |
| 28 | 0280 | 43.00 | 43.00 | 31.00 | 11.50 |
| 30 | 0300 | 45.00 | 45.00 | 31.00 | 11.50 |
| 32 | 0320 | 47.00 | 47.00 | 31.00 | 11.50 |
| 33 | 0330 | 48.00 | 48.00 | 31.00 | 11.50 |
| 35 | 0350 | 50.00 | 50.00 | 31.00 | 11.50 |
| 38 | 0380 | 55.00 | 56.00 | 31.00 | 14.00 |
| 40 | 0400 | 57.00 | 58.00 | 31.00 | 14.00 |
| 43 | 0430 | 60.00 | 61.00 | 31.00 | 14.00 |
| 45 | 0450 | 62.00 | 63.00 | 31.00 | 14.00 |
| 48 | 0480 | 65.00 | 66.00 | 31.00 | 14.00 |
| 50 | 0500 | 67.00 | 70.00 | 32.50 | 15.00 |
| 53 | 0530 | 70.00 | 73.00 | 32.50 | 15.00 |
| 55 | 0550 | 72.00 | 75.00 | 32.50 | 15.00 |
| 58 | 0580 | 79.00 | 78.00 | 37.50 | 15.00 |
| 60 | 0600 | 81.00 | 80.00 | 37.50 | 15.00 |
| 63 | 0630 | 84.00 | 83.00 | 37.50 | 15.00 |
| 65 | 0650 | 86.00 | 85.00 | 37.50 | 15.00 |
| 68 | 0680 | 89.00 | 90.00 | 34.50 | 18.00 |
| 70 | 0700 | 91.00 | 92.00 | 42.00 | 18.00 |
| 75 | 0750 | 99.00 | 97.00 | 42.00 | 18.00 |
| 80 | 0800 | 104.00 | 105.00 | 41.80 | 18.20 |
| 85 | 0850 | 109.00 | 110.00 | 41.80 | 18.20 |
| 90 | 0900 | 114.00 | 115.00 | 46.80 | 18.20 |
| 95 | 0950 | 119.00 | 120.00 | 47.80 | 17.20 |
| 100 | 1000 | 124.00 | 125.00 | 47.80 | 17.20 |
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.
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.
Industry Solutions
Case Study
Pipeline Station: Replaced OEM Type 8B1 seals on a mainline pump. Our aftermarket version matched the pressure rating perfectly and was delivered in 1 week versus 12 weeks for the OEM.
Testimonials
We use these to service all our older API pumps. The dimensions are identical to the Crane originals, but the price allows us to be competitive on repairs.
—Pump Service Center, Texas
FAQs about Metal Bellows Seals for High Temperature Pumps
Q: What is the difference between Type 8-1 and Type 9?
A: They are mechanically similar pusher seals. The Type 9 typically uses a PTFE wedge for chemical resistance, while the Type 8-1 uses an O-ring. We supply replacements for both.
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
