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Engineered API 682 Cartridge Seal built to your pump data, tested before they ship.

Every unit ships with its serial number, COC and air-leak test report. Send the pump or seal data you have — we confirm what is known and list what is missing.

Proven Seal Core Critical Metal Parts Machined In-House Factory-Assembled

100% Air-Leak TestedComplete Documentation Package

API Spec Q1 10th Edition certificate of registration Q1-5423 — FBU Sealing Technology (Suzhou)

Why Choose FBU

Drop-in fit for the pumps you already run

Built to your pump datasheet and frozen before production, so installation is a fit-and-torque job — not a re-engineering project. Replacement cartridges for John Crane, Flowserve and Sulzer process pumps.

Paperwork in the box, not on

request

Every cartridge ships with its unique serial number, COC, air-leak test report, outline and installation drawings, and full packing documents. Lead time is confirmed in writing before you commit.

You keep your brand and your customers

Controlled FBU/OEM part numbers give you an independent spare-seal and repair-kit supply channel. Your end customers stay yours, and you never get cut out of your own aftermarket.

Our Certification

API Spec Q1

API Spec Q1 10th Edition certificate of registration Q1-5423 — FBU Sealing Technology (Suzhou)

ISO 9001:2015

ISO 9001:2015 quality management system certificate

ISO 14001:2015

ISO 14001:2015 environmental management system certificate

ISO 45001:2018

ISO 45001:2018 occupational health and safety certificate

ATEX

ATEX certification for equipment used in explosive atmospheres
API 682 SEAL PROGRAM

Replacing a John Crane or Flowserve seal? Send the model.

Send the pump model, duty, dimensions or existing seal information. FBU confirms what is known, lists what is missing, and proposes a controlled complete cartridge configuration for your program.

Or you may contact us directly via the contact information below.

Send us what you have. We'll tell you what's missing.

Design & Analysis

3D assembly design of an API 682 cartridge seal with pump interface review

3D DESIGN

Complete Assembly and Interface Review

Controlled 3D assemblies support fit, drawing release and manufacturing continuity.

Structural analysis of cartridge seal components under pressure load

STRUCTURAL ANALYSIS

Pressure and Component Behavior


Applicable analysis reviews deformation, strength and pressure-boundary behavior.

Thermal analysis of a mechanical seal showing temperature distribution

THERMAL ANALYSIS

Temperature and Thermal Deformation


Applicable analysis reviews temperature distribution and combined thermal-mechanical behavior.

In-house machining of seal sleeves, glands and seal ring holders
Sleeves, glands, seal ring holders and other critical parts machined in-house
Dimensional inspection of mechanical seal components
Dimensional inspection
Five-axis five-linkage CNC machining centre cutting critical seal components
Critical seal components machined by five‑axis five‑linkage CNC equipment
Factory assembly and air-leak testing of cartridge seals
Factory assembly and air-leak testing
Dynamic test bench for cartridge seal performance testing
Dynamic Test Bench
Finished cartridge seals packed and ready for shipment
Delivered Products

Machined In-House

Sleeves, glands, drive rings, seal ring holders and other critical metal parts.

ZEISS Coordinate Measuring Machine

High-precision dimensional inspection by ZEISS CMM for tight tolerance control.

Factory-Assembled

Complete cartridge construction—not loose components for new-seal assembly.

100% Air-Leak Tested

Every complete cartridge seal receives factory air-leak testing.

SAP + PLM Controlled

BOM, drawing revision, order, quality and traceability records are controlled digitally.

Dynamic Test Rig

Dynamic testing can be arranged according to project scope and customer requirements.

Complete Delivery

Each cartridge seal includes ID & installation data, with inspection records retained for traceability.

API Spec Q1 · 10th Edition

Certificate Q1-5423 · Design, manufacture and sale of mechanical seals for the oil and gas industry.

Don’t just take our word for it Click the button below to view it for yourself online.

Successful Cases

APOG-FB cartridge seal set delivered for a WARMAN slurry pump

Seal for WARMAN®-brand Slurry Pumps

Seal set supplied for a FLOWSERVE BB2 pump at a PTA plant

Seal for FLOWSERVE® BB2 pump

APOG seal installed on a Flowserve ERPN pump

Seal for Flowserve® ERPN


220 mm cartridge seal for a water ring vacuum pump

Seal for Water ring vacuum pump

API 682 SEAL PROGRAM

Built to API 682. Send the pump tag, get the compliant cartridge.

Send the pump model, duty, dimensions or existing seal information. FBU confirms what is known, lists what is missing, and proposes a controlled complete cartridge configuration for your program.

Or you may contact us directly via the contact information below.

Send us what you have. We'll tell you what's missing.

labyrinth

CONTACT US

  sales@fbuseals.com

  +86-512-57011188

  No.183 , Yinhe Road, High Tech Industrial Development Zone Changshu Suzhou, Jiangsu, China Postal Code: 215533

Copyright © 2026 FBU Sealing Technology (Suzhou) CO.Ltd. All Rights Reserved.