Engineered to address specific operational challenges, from handling slurry in mining environments to simplifying maintenance in large rotating equipment.
MECHANICAL PUMP SEALS
Pump seals
Discover John Crane pump seals designed for long-lasting reliability, reduced leakage and efficient performance in pump applications.
Overview
John Crane offers a comprehensive range of mechanical pump seals, delivering reliable sealing solutions for every application.
From small elastomer bellows seals used in millions of domestic water pumps to double mechanical seals for pumps that ensure maximum seal reliability and safety, we provide the proper mechanical seal for pump performance in many operating environments.
Our world-class rotating equipment technologies, paired with engineering expertise, meet virtually all international standards including API 682 and help plants reduce maintenance costs and down time and improve equipment reliability.
When it comes to keeping rotational equipment running 24/7, John Crane’s extensive portfolio of seals for pumps has you covered.
OUR PUMP SEALS
Explore our pump seals
Liquid hydrocarbon pipeline seals
Pipeline applications are unique. At John Crane, we understand the importance of pipeline integrity, and of avoiding seal failure.
Metal bellow seals
Available in edge-welded and formed designs, our seals are essential in environments requiring long-term durability, leak prevention and resistance to extreme conditions.
Non-contacting seals
Our non-contacting mechanical seals can assist companies who are seeking a zero-emission/zero leakage seal solution to achieve environmental and safety regulations.
O-ring pusher seals
From cost-effective component designs to high-duty and API 682-qualified solutions, our o-ring pusher seals are engineered for some of the industry’s most demanding applications.
PTFE bellow seals
A reliable and long-lasting sealing solutions in challenging environments, our PTFE bellow seals are designed to meet your highest standards.
Slurry seals
Our slurry seals are designed to resist the destructive effects of ore, limestone, phosphates, kaolin clay, lime mud, boiler fly ash, rock salt, sludge, sand and gravel.
Split seals
Intended for facilities with large pumps and rotating equipment, our split seals are easy to install, help reduce downtime and increase MTBR.
Standard cartridge seals
We offer a broad portfolio of standard cartridge mechanical seals that are versatile, easy to install and suitable for a wide range of applications.
PROVEN RELIABILITY
Proven reliability across mechanical pump seal applications
Our pump seals are engineered for demanding operating environments, from routine pump seal replacement to critical double mechanical seal applications, with a portfolio covering all major pump seal types, including cartridge seals, component seals and pump seal kits.
Designed to reduce leakage, minimise downtime, and extend equipment life, our mechanical seals for pumps deliver proven reliability, safety, and compliance with global standards.
Backed by decades of applied engineering expertise, John Crane mechanical pump seals keep operations running smoothly, day after day.
John Crane Performance Plus™
John Crane Performance Plus™ is our modular service framework, supported by the largest mechanical seal service network, with over 200 manufacturing, sales and service centres globally. That means we are where you need us, when you need us – empowering people, plant and performance.
FREQUENTLY ASKED QUESTIONS
Common questions
What is a pump seal?
A pump seal is a device that prevents fluid from leaking along the rotating shaft of a pump. Mechanical seals for pumps create a tight, reliable barrier between stationary and rotating components, improving safety, efficiency, and uptime in industrial and commercial applications.
How do pump seals work?
Pump seals work by maintaining a controlled, lubricated interface between two precision-machined faces, one of them rotating and one stationary. This prevents leakage, reduces wear and keeps the pump operating efficiently. Different pump seal types suit various pressures, temperatures and fluids.
How to install a pump seal?
To install or change a pump mechanical seal:
- Isolate the pump
- Remove the old seal
- Clean the housing
- Fit the new pup seal kit according to manufacturer guidelines
Proper alignment and lubrication are essential. For reliability, installation is best handled by trained technicians.
How does a mechanical seal work in a pump?
A mechanical seal on a pump uses two flat sealing faces, one stationary and the other rotating, to create a tight, low-leakage interface. A thin fluid film lubricates the faces, enabling reliable sealing under varying pressures, speeds and temperatures.
How long should pump seals last?
Mechanical pump seals typically last several years, depending on operating conditions, fluid properties, installation quality and maintenance. Proper alignment, lubrication and monitoring can significantly extend seal life and reduce the need for unplanned pump seal replacement.
FURTHER READING
Read our latest blogs on pump seals
How the critical minerals value chain is reshaping opportunities for pump and compressor OEMs
Upstream Pumping (USP): Supporting chemical plant processing – Part 1
