John Crane Double Cartridge Mechanical Seal

John Crane Double Cartridge Mechanical Seal

Type: Double cartridge mechanical seal

Replace Brand: John Crane mechanical seal

Specification:  type 6/type 8/type 9/type 21/109b/2100/5610/8b1/8b2

Temperature: high temperature mechanical seal

Balance: Unbalanced

Type: Multi-Spring

Accreditation: ISO, SGS, UL, ROHS

Service: OEM/ODM

Origin: China

Model:2
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Key Features


• Zero Emissions: A dual-pressurized double cartridge mechanical seals are designed for hazardous, toxic, or volatile fluids.

• Gas Lubricated (Hybrid): The "LP" typically stands for specialized face geometry (sometimes gas-lift or liquid lubricated depending on config) for low emission performance.

• Integrated Pumping: Features a highly efficient internal pumping ring to circulate barrier fluid for cooling.

• Face-to-Face or Tandem: Modular design allows for different dual seal arrangements to suit API Plan 52 or 53.

• Engineered Faces: Faces are optimized for low heat generation, extending the life of both the double cartridge mechanical seal and the barrier fluid.


John Crane Double Cartridge Mechanical Seal 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


John Crane Double Cartridge Mechanical Seal
CF2-2.jpg



Product Specifications


D1 (inch)Size CodeD1 (mm)Size CodeD3D7L1L4
0.500012712012030.1425.4020.647.93
14014033.3231.7522.2310.30
0.625015816016033.3231.7522.2310.30
0.750019118018036.5034.9322.2310.30
20020039.6738.1023.8010.30
0.875022222022039.6738.1023.8010.30
24024045.5041.2825.4011.10
1.000025425025045.5041.2825.4011.10
1.125028628028048.5044.4426.9711.10
30030052.3747.6326.9711.10
1.250031732032052.3747.6326.9711.10
33033056.0050.8028.5811.10
1.375034935035056.0050.8028.5811.10
1.500038138038059.2053.9828.5811.10
1.625041240040067.0060.3334.9312.70
43043069.8563.5034.9312.70
1.750044445045069.8563.5034.9312.70
1.875047648048073.0366.6838.1012.70
2.000050850050076.2069.8538.1012.70
2.125053953053082.5576.2042.8514.28
2.250057155055085.7379.3842.8514.28
2.375060360060088.9082.5546.0214.28
2.500063563063092.0885.7346.0214.28
2.625066665065098.4385.7349.2015.90
2.7500698700700101.6088.9049.2015.90
2.8750730730730104.7895.2552.3715.90
3.0000762750750107.9598.4352.3715.90



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 of John Crane double cartridge mechanical seal, meeting various high-specification manufacturing requirements.


John Crane Double Cartridge Mechanical Seal
John Crane Double Cartridge Mechanical Seal
John Crane Double Cartridge Mechanical Seal
John Crane Double Cartridge Mechanical Seal



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 double cartridge mechanica seals undergo rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments.


R&D and Design.jpg
microscope.jpg
Light band detection.jpg
pressure test.jpg



Industry Solutions


Metal Bellows Seals for High Temperature Pumps 606
Metal Bellows Seals for High Temperature Pumps 606
Metal Bellows Seals for High Temperature Pumps 606
Metal Bellows Seals for High Temperature Pumps 606




Case Study


Benzene Transfer: Strict emissions regulations required a double seal upgrade. We installed the 48LP equivalent with Plan 53A. The double cartridge mechanical seal seal has operated with zero detectable emissions for 3 years.

Testimonials


A premium double cartridge mechanical seal. We use it on our most critical chemical reactors and pumps.

—EHS Manager, Chemical Plant



FAQs About John Crane Double Cartridge Mechanical Seal


Q: Does this require a gas panel?

A: If configured as a liquid-lubricated dual seal (standard), it needs a fluid reservoir (Plan 53). If configured for gas lift (Type 28 style), it needs a gas panel. Please specify your barrier media.

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If you have any questions about our products and services, please feel free to contact us. Our team will get in touch with you within 24 hours!
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    Our company is specialized in the production of sealing materials, mechanical seals , cartridge seals.

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