• Dry-Run Faces (Optional): Can be fitted with specialized dry-running Carbon faces for gas-phase reactions where liquid lubrication is prohibited.
• Non-Metallic Options: For glass-lined reactors, we offer ceramic-coated or PTFE-sleeved metal parts to prevent metal contamination.
Key Features
• Reactor-Grade Upgrade: A heavily reinforced version of the standard Type 21, designed for small to medium top-entry glass-lined or stainless steel reactors.
• Double Seal Config: Often supplied as a double seal arrangement (Back-to-Back) to provide a liquid barrier for toxic or gaseous reactor contents.
• Short Working Length: Ideal for reactors with limited headroom or compact sealing housings.
Technical Specs | Materials | ||
Mediums | Water, oil and weakly-corrosive mediums | Stationary Ring | Ceramic/Sic/TC |
Pressure | ≤1.0MPa | 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
| D1 (inch) | Size Code | D3 | D7 | L4 | L1 | L11 |
| 0.500' | 0127 | 23.90 | 25.40 | 7.93 | 20.62 | 31.75 |
| 0.625' | 0158 | 26.70 | 31.75 | 10.28 | 22.22 | 34.93 |
| 0.750' | 0191 | 31.10 | 34.93 | 10.28 | 22.22 | 34.93 |
| 0.875' | 0222 | 33.40 | 38.10 | 10.28 | 23.80 | 36.50 |
| 1.000' | 0254 | 43.20 | 41.28 | 11.10 | 25.40 | 41.28 |
| 1.125' | 0286 | 46.30 | 44.44 | 11.10 | 26.97 | 42.85 |
| 1.250' | 0317 | 49.40 | 47.63 | 11.10 | 26.97 | 42.85 |
| 1.375' | 0349 | 52.60 | 50.80 | 11.10 | 28.58 | 42.85 |
| 1.500' | 0381 | 55.80 | 53.98 | 11.10 | 28.58 | 42.85 |
| 1.625' | 0412 | 62.20 | 60.33 | 12.70 | 34.93 | 50.80 |
| 1.750' | 0444 | 66.00 | 63.50 | 12.70 | 34.93 | 50.80 |
| 1.875' | 0476 | 66.60 | 66.68 | 12.70 | 38.10 | 53.98 |
| 2.000' | 0508 | 73.00 | 69.85 | 12.70 | 38.10 | 53.98 |
| 2.125' | 0539 | 73.30 | 76.20 | 14.28 | 42.88 | 60.32 |
| 2.250' | 0571 | 78.40 | 79.38 | 14.28 | 42.88 | 60.32 |
| 2.375' | 0603 | 82.00 | 82.55 | 14.28 | 46.02 | 63.50 |
| 2.500' | 0635 | 84.90 | 85.73 | 14.28 | 46.02 | 63.50 |
| 2.625' | 0666 | 88.40 | 85.73 | 15.90 | 49.20 | 69.85 |
| 2.750' | 0698 | 92.60 | 88.90 | 15.90 | 49.20 | 69.85 |
| 2.875' | 0730 | 94.85 | 95.25 | 15.90 | 52.37 | 73.03 |
| 3.000' | 0762 | 101.90 | 98.43 | 15.90 | 52.37 | 73.03 |
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
Pilot Reactor: A pilot plant reactor used a standard Type 21 that leaked vapors. We upgraded it to a Double Type 21 arrangement with a pressurized oil pot. The barrier fluid prevented any process gas from escaping.
Testimonials
Simple, effective sealing for our mixing vessels. The double arrangement gives us the safety we need.
—Lab Manager, Pharma
FAQs about Metal Bellows Seals for High Temperature Pumps
Q: Can a Type 21 handle reactor runout?
A: The standard Type 21 has limited runout capability. For reactors with significant wobble (>0.1mm), we recommend our heavy-duty bearing-integrated version or upgrading to a vessel-specific seal.
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
