High-Performance Double Mechanical Seal Type 21 for Optimal Efficiency

• Customization: Available
• Structure: Single End
• Pressure: High Pressure Mechanical Seals
• Model NO.: QT-D21
• Speed: General Speed Mechanical Seal
• Temperature: Low-Temperature Mechanical Seal
• Performance: Temperature
• Standard: Standard
• Type: Qt-D21
• Balance: Balanced
• Brand: Queeny
• Price: Lower Than Original
• Delivery Time: Stock
• Quality: 12 Month Guarantee
• Transport Package: Beautiful Package
• Specification: Customized
• Trademark: Queeny
• Origin: Shanghai, China
• HS Code: 8484200090
• Production Capacity: 300000PCS
• Package Size: 10.00cm * 10.00cm * 10.00cm
• Package Gross Weight: 1.000kg

Product Description

Parameter	Value/Description	Unit/Note
Model	QT-D21	Dual-sensor combustible gas detector with advanced functionality
Standards Compliance	GB15322.6-2019, ISO 17025	Meets high-precision industrial and safety standards
Sensing Principle	- Primary: Catalytic combustion sensor - Secondary: Infrared (IR) sensor	Dual detection for LPG, methane, and cross-gas interference rejection
Measurement Range	0-100% LEL (catalytic) 0-5% VOL (IR for methane)	Wide range for different gas concentrations
Accuracy	±3% of reading (catalytic) ±2% of reading (IR)	High-precision dual-sensor verification
Response Time	≤15 seconds (T90, catalytic) ≤25 seconds (T90, IR)	Rapid response for emergency gas leaks
Alarm Types	- Audible: ≥90 dB at 1m - Visual: RGB LED (green/amber/red) - Relay outputs (2 channels for low/high alarms)	Multi-level alerts with external device control
Communication Interfaces	- 4-20 mA (dual channels) - RS485 (Modbus RTU) - Wireless: LoRaWAN/Zigbee (optional)	Integration with SCADA systems and remote monitoring platforms
Power Supply	- 24 V DC (main) - UPS backup: 4-hour runtime	Stable power with failover protection for critical applications
Environmental Rating	IP66 (dust-tight and water-resistant) Ex db IIC T6 Gb (explosion-proof)	Suitable for harsh environments (Zone 1/21, outdoor use)
Installation	- Wall-mounted - Pipeline-mounted with sampling probe	Flexible setup for industrial pipelines or fixed locations
Dimensions (L×W×H)	220 mm × 160 mm × 100 mm	Rugged enclosure for heavy-duty use
Certifications	CCC, ATEX, IECEx, NEPSI	International explosion-proof and safety approvals
Applications	Petrochemical plants, chemical storage facilities, gas transmission networks	Dual-sensor design for high-reliability gas safety in complex environments
Key Features	- Auto-calibration function - Dual-sensor redundancy - Real-time gas type identification (IR sensor)	Reduces maintenance costs and improves detection reliability

Queeny design engineers are able to produce a seals solution for the most basic applications,to those that are extremely complicated and unique. We are able to provide you these solutions supported by life test data and years of excellent field performance.As your partner, we provide sealing solutions for centrifugal pumps,agitators and other rotating equipment, and help you consolidate your brand and market position.

 

Our products are made of high quality materials and manufacturing processes, with a long service life and low cost of use. It can effectively reduce the maintenance costs and operating costs of equipment .

 

Our mechanical seals are designed to be easy to service and replace,simply by removing the sealing components and replacing the sealing surface and sealing ring. Compared with other sealing forms, our products are more convenient to repair and replace.

 

Mechanical seal is suitable for high temperature, low temperature, high pressure, vacuum and corrosive media and other complex environment, to ensure the stable operation of the equipment.

Shanghai Queeny Mechanical Equipment Co.,Ltd.is an enterprise specializing in the R&D,manufacture and export of mechanical seal products,headquartered in Pudong New Area,Shanghai.Our products mainly include component seals,dry gas seals,metal bellows seals,mixer and agitator seals,single & dual cartridge seals,silicon carbide parts and tungsetn carbide parts,which can replace John Crane, Burg--mann, AES, Chesterton,Flowserve,Rotenand other similar products,they are widely used in water treatment,petroleum,chemical,food,medical and other industries.
Relying on first-class technology and professional services,since its establishment, Queeny has carried out in-depth cooperation with hundreds of companies in more than 70 countries around the world.Our products are exported to Asia,Europe,North America,South America,Oceania and Africa in large quantities every year,and have been widely praised.Super high cost performance is the basis of our long-term cooperation with customers.We always rigorously treat clients' requirements,strictly control the production process,and comprehensively monitor the export procedure.It is our mission to reduce production and operation costs for more enterprises all over the world.Q1: Are you a trading company or a factory?
We are a factory, so we can offer you factory prices with high quality.

Q2: Can I get samples?
Yes. You can ask for samples. Usually it's free, but you need to pay for shipping.

Q3: Can l use my own logo or design on the goods?
Yes, we provide OEM/ODMservices; your logo and design can be printed on the products.

Q4: What are your payment terms?
We accept T/T, Paypal, Western Union, and credit card payment is also welcome.

Q5: How about the delivery time?
For stock items, we can ship immediately after receiving the payment.
For other products, we need 14-25 days for mass production, which depends on the quantity and type of order.

Q6: How can we ensure the quality?
Pre-production samples are required before mass production;Final inspection is required before shipment;

Q7: 1 can't find our products in your catalog, can you customize the products for us?
Yes, customized products are available, OEM is welcome.

Q8: Can l buy pumps or pump parts from your company?
Yes, we also provide pumps and pump parts.