Pump & Valve Seals

Double Cartridge Mechanical Seal

Double cartridge mechanical seals for chemical and process pumps. Dual sealing arrangements, barrier and buffer fluid options, SiC faces and custom configurations.

Custom sizes, materials and profiles available
Reliable sealing performance under demanding conditions
Export-ready packing and documents

1. General Specifications

Parameter	Specification
Product Name	Double Cartridge Mechanical Seal
Product Type	Dual Cartridge Pump Seal
Seal Arrangement	Double / Dual Mechanical Seal
Construction	Pre-Assembled Cartridge Unit
Seal Face Materials	Carbon Graphite / Silicon Carbide / Tungsten Carbide
Secondary Seal Materials	NBR / EPDM / FKM / PTFE Options
Metal Components	Stainless Steel 316 / Alternative Alloys
Reference Temperature Range	-40°C to +220°C (Selected Designs)
Reference Process Pressure	Up to 20–25 bar (Selected Designs)
Reference Sliding Velocity	Up to 10–16 m/s (Selected Designs)
Barrier / Buffer System	Pressurized / Unpressurized Options
Seal Balance	Balanced Configurations Available
Installation	Cartridge / Gland-Mounted
Shaft Sizes	Standard Metric / Inch / Custom Sizes
Applications	Chemical Pumps / Process Pumps / Hazardous Fluid Handling
Customization	Dimensions / Materials / Seal Arrangement
MOQ	Flexible

2. Seal Face Material Options

Face Combination	Main Characteristics	Typical Applications
Carbon / Silicon Carbide	Good sliding performance with suitable lubrication	General Process Fluids
Silicon Carbide / Silicon Carbide	High wear resistance and chemical compatibility	Chemical Processing / Selected Abrasive Media
Tungsten Carbide / Tungsten Carbide	Good strength and abrasion resistance	Selected Heavy-Duty Pump Applications
Carbon / Tungsten Carbide	Established combination for selected industrial sealing duties	Industrial Pumps / Process Equipment

3. Double Seal Arrangement Options

Arrangement	Main Characteristics	Typical Applications
Pressurized Dual Seal	Barrier fluid pressure is maintained above process-side seal chamber pressure	Hazardous / Difficult-to-Seal Fluids
Unpressurized Dual Seal	Buffer fluid system operates below the process-side sealing pressure	Leakage Collection / Emission Control
Back-to-Back Arrangement	Opposed sealing faces in a dual-seal configuration	Selected Barrier Fluid Systems
Face-to-Face Arrangement	Opposing seal assemblies configured around an intermediate fluid space	Industrial Process Equipment
Tandem Arrangement	Two seals arranged sequentially along the shaft	Process Leakage Containment / Buffer Systems

Double Cartridge Mechanical Seals are pre-assembled dual sealing units designed for industrial pumps handling hazardous, volatile, abrasive or difficult-to-seal process fluids. These seals incorporate two sets of mechanical sealing faces within a cartridge assembly, providing an additional level of leakage control compared with conventional single mechanical seals.

Double cartridge seals can operate with an appropriate external buffer or barrier fluid system, depending on the seal arrangement and process requirements. The supporting fluid helps lubricate and cool the sealing faces and may improve reliability when handling demanding process media.

Features & Advantages

Dual Sealing Arrangement: Two sets of mechanical seal faces provide additional containment capability.
Cartridge Construction: Pre-assembled components simplify installation and reduce on-site adjustment requirements.
Barrier & Buffer Fluid Options: Compatible designs can operate with suitable pressurized or unpressurized support systems.
Enhanced Leakage Control: Suitable for applications requiring improved containment of hazardous or volatile liquids.
Balanced Seal Options: Hydraulically balanced designs help control sealing face loads under varying pressure conditions.
Multiple Material Combinations: Available with carbon, silicon carbide, tungsten carbide and compatible secondary sealing materials.
Flush & Cooling Connections: Selected configurations incorporate ports for circulating and monitoring support fluids.

Materials & Construction

Double cartridge mechanical seals commonly use carbon graphite, silicon carbide or tungsten carbide sealing faces.

Secondary sealing elements may include FKM, EPDM, NBR or PTFE materials, depending on the operating fluid and temperature.

Cartridge components are generally manufactured from stainless steel, with additional alloy options for corrosive process environments.

Depending on the equipment and operating conditions, double cartridge seals may be configured with face-to-face, back-to-back or tandem sealing arrangements.

Typical Applications

Chemical and petrochemical processing
Industrial process pumps
Pharmaceutical and specialty chemical equipment
Wastewater and contaminated-fluid handling
Solvent and hydrocarbon pumping systems
Selected slurry and abrasive-fluid applications
Industrial plants requiring additional leakage containment

Standard & Custom Supply

CORA SEALS supplies double cartridge mechanical seals for industrial pump manufacturers, process equipment operators, maintenance contractors and aftermarket replacement requirements.

Various shaft sizes, sealing face combinations, gland configurations and material options can be sourced based on application requirements.

For quotations, please provide the pump model, shaft diameter, seal chamber dimensions, process medium, working pressure, operating temperature and rotational speed.

Please also specify whether a pressurized barrier fluid or unpressurized buffer fluid arrangement is required. Existing drawings, samples and support system details can help confirm the appropriate seal design.

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