Views: 0 Author: Site Editor Publish Time: 2026-07-24 Origin: Site
When a single mechanical seal is no longer enough — because the fluid is hazardous, the process cannot tolerate any leakage, or environmental compliance demands zero emission — the EDM double seal from FBU SEALS delivers a reliable and cost-effective answer. Engineered as a standardized dual cartridge seal with a back-to-back configuration, it is built to protect both your centrifugal pump and your operating budget.
The EDM is a back-to-back rotary pusher cartridge seal that arrives factory-set, which simplifies installation in the field and eliminates the risk of assembly errors. Its seal faces are hydraulically balanced, a design choice that reduces heat generation at the contact surface, lowers energy consumption, and extends the working life of the seal. Around this core, a modular architecture with standardized universal components gives the seal maximum configuration flexibility and fast delivery performance, while a multi-spring design keeps the springs clear of the product media so they resist clogging and last longer.
Covering shaft diameters from 24 mm to 100 mm (1.000" to 4.000"), the EDM operates at pressures up to 15 bar, temperatures from -20 °C to +120 °C, and sliding velocities up to 20 m/s. It is designed for ISO 2858 standard seal chambers and other compact chambers, and supports the common barrier-fluid piping plans 52, 53A, 53B, 53C and 54 between its two seal stages — making it a genuine drop-in solution for most general centrifugal pump applications.
Material selection follows the demands of real process duty. Structural parts such as the shaft sleeve, seats, gland, clamp ring and anti-tamper screws are made from corrosion-resistant 316 stainless steel. The seal faces are offered in Carbon, silicon carbide (SSIC) or tungsten carbide (TC), and the O-rings can be supplied in EPR, Viton, Aflas or Kalrez to match the specific medium. The springs are manufactured from Alloy 276 for dependable long-term performance.
Across industries, the EDM double seal serves chemical and petrochemical plants, the oil, gas and energy sector, water treatment and environmental protection projects, pharmaceutical and food & beverage lines, hazardous-chemical and specialized processes, as well as marine and offshore engineering. In every one of these settings, its redundant sealing barrier is what keeps toxic, flammable, abrasive or environmentally sensitive media safely contained.
What makes the EDM the economical choice is the way its modular cartridge design, hydraulically balanced faces and media-isolated springs work together: heat, energy draw, clogging risk and unplanned downtime are all reduced, while standardized parts keep typical lead time to around one week. For plants that need the safety of a double seal without the premium price, the EDM is the practical, budget-friendly path forward.
Q: What is a double mechanical seal and when do I need one?
A: A double mechanical seal uses two seal faces in series to create a barrier between the pumped fluid and the atmosphere. You need one when handling toxic, flammable, abrasive, or environmentally hazardous media where a single seal leak would be unsafe or non-compliant.
Q: What does the back-to-back configuration mean?
A: Back-to-back means the two seal faces are arranged with their wearing surfaces facing outward toward a buffered or circulated barrier fluid. This layout balances hydraulic loads and lets the EDM run safely with a simple, low-cost barrier fluid plan (52 / 53A / 53B / 53C / 54).
Q: Which pump chambers is the EDM double seal compatible with?
A: The EDM is designed for ISO 2858 standard seal chambers and other compact chambers, making it a drop-in modular solution for most general centrifugal pump applications.
Q: What are the size and operating limits?
A: Shaft diameter 24–100 mm (1.000"–4.000"), pressure ≤ 15 bar, temperature -20 °C to +120 °C, sliding velocity ≤ 20 m/s.
Q: What materials are used?
A: Structural parts are 316SS; seal faces in Carbon / SSIC / TC; O-rings in EPR / Viton / Aflas / Kalrez; springs in Alloy 276.
Q: How is the EDM more economical than other double seal solutions?
A: Its modular, standardized cartridge design maximizes parts commonality and shortens lead time to about one week. Hydraulically balanced faces cut heat and energy use and extend seal life, while springs kept out of the product media prevent clogging — lowering total cost of ownership.
