Key Features

• Cartridge Upgrade: Takes the industry-standard flowserve pac seal type 21 and packages it into a convenient, pre-set cartridge format.

• Eliminates Measurement: Removes the need to measure working length or mark the shaft, which is the #1 cause of flowserve pac seal type 21 failure.

• Universal Gland: Features a slotted gland plate designed to fit the bolt circles of most ANSI and DIN standard pumps originally fitted with component seals.

• Shaft Protection: Unlike the standard flowserve pac seal type 21 where the drive band bites into the shaft, this cartridge version has an internal sleeve, protecting the pump shaft from damage.

• Improved Concentricity: The cartridge gland ensures the stationary seat is perfectly square to the shaft, reducing uneven wear.

Product Specifications

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 flowserve pac seal type 21 machining accuracy and production efficiency, meeting various high-specification manufacturing requirements.

Product Research, Development and Testing

Our Product R&D and Testing focuses on optimizing seal performance through advanced simulation and material analysis. All flowserve pac seal type 21 undergo rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments.

Industry Solutions

FAQs about Flowserve Pac Seal Type 21 Cartridge Seals with O-rings

Q: Is this more expensive than the flowserve pac seal type 21?

A: Yes, the initial purchase price is higher due to the metal gland and sleeve. However, the total cost of ownership is lower because it installs faster and lasts longer due to better alignment.

Q: Is this seal a direct replacement for my existing Flowserve or John Crane Type 21?

A: Yes. MIAOYU's flowserve pac seal type 21 Cartridge is engineered to be dimensionally and functionally interchangeable with original Flowserve, John Crane, and other industry-standard Type 21 seals. It is a direct drop-in replacement for pumps designed for these models.

Q: What is the main advantage of the flowserve pac seal type 21 cartridge design over a component seal?

A: The cartridge design integrates all components (faces, springs, sleeve) into a single, pre-assembled unit. This eliminates the need for precise shaft measurement and manual setting during installation, drastically reducing the risk of installation errors and protecting the pump shaft from drive band wear.