Mechanical Seal Metal Bellows Seal John Crane 670, 680,

• Customization: Available
• Structure: Single End
• Pressure: Medium Pressure Mechanical Seals
• Model NO.: QT-680
• Speed: General Speed Mechanical Seal
• Temperature: Temperature Mechanical Seal
• Performance: Wear
• Standard: Standard
• Type: Seal-Bellow
• Balance: Unbalanced
• Delivery: 2 Weeks
• Warranty: 2 Years
• Shipment: DHL, FedEx, UPS
• Quality Guarantee: Test After Production
• Transport Package: Customzed
• Specification: Standard
• Trademark: Queeny
• Origin: China
• HS Code: 84842000
• Production Capacity: 10000

Product Description

Mechanical Seal Model: QT-680 Technical Specifications

Parameter	Specification
Model Number	QT-680
Type	Multi-Spring / Balanced / Cartridge Design
Material Options
- Primary Seal Faces	Rotating: Carbon Grade 155 / Stationary: Alumina Ceramic
- Secondary Seals	Ethylene Propylene (EPDM), Perfluoroelastomer (FFKM)
- Metal Parts	Stainless Steel (SS316L), Titanium (Optional)
Operating Limits
- Pressure Range	0~3.0 MPa (435 psi)
- Temperature Range	-40°C to +250°C (-40°F to +482°F)
- Max. Speed	≤30 m/s (≈98 ft/s)
Shaft Diameter	20~200 mm (0.8~7.9 in) [Customizable]
Fluid Compatibility	Crude Oil, Glycol, Solvents, High-Temperature Water
Leakage Rate	≤3 mL/hr (API 682 compliant)
Standards	ISO 9001, API 682 (Type C), EN 12756
Applications	Refinery Pumps, Pipeline Systems, Heavy-Duty Industrial Equipment

1. Are we a factory or a trading company?
We are a factory only producing mechanical seals and we have our own marketing department  and also home market. The main market is 50% in China and 50% in European countries where most pumps factories located, we mainly supply to pump factories.

2. What are the payment methods?
We accept T/T, Western Union, Paypal, Made in China as your convenience.

3. How long is the delivery time?
Products in stock will be shipped within 48 hours. Standard seal 1-2 weeks. Custom seals are 3-4 weeks.

4. Could you offer sample ?
Yes, the sample could be sent to you with freight charge paid at your destination.

5. About our packaging type?
We have 2 kinds of packaging, one is with our brand, another one is white blank . with enough quantity, we could use your own logo in the package after your logo authorization.

6.I can not find our products in your catalog ,can you make customized products for us ?
Yes ,Customized products is available . Also, We have been adding new seals, there are many types we have not added in here yet, please send us the pump type or seals international code, we could identify the seals you need.