Question 1

What is a spring pusher seal?

Accepted Answer

A spring pusher seal is the most common mechanical seal design, using one or more springs to load the seal face against the mating ring. The dynamic O-ring "pushes" along the shaft as the faces wear, keeping constant contact. It suits clean water, chemicals, and general-purpose pump service.

Question 2

Single spring vs multi-spring — which do I need?

Accepted Answer

Single-spring designs handle viscous, fibrous, or crystallizing fluids better because the large coil resists clogging. Multi-spring designs give more even face loading and are preferred for higher speeds and cleaner media.

Question 3

What pressure and temperature can these seals handle?

Accepted Answer

Standard spring pusher seals handle up to 25 bar / 362 psi and 120 °C / 250 °F. High-duty variants push to 40 bar and 200 °C. Beyond that, look at bellow or cartridge designs.

Question 4

Are Astra seals compatible with major OEM pump brands?

Accepted Answer

Yes. Every Astra seal is engineered as a direct dimensional and performance replacement for major OEMs including John Crane, Flowserve, EagleBurgmann, AESSEAL, Chesterton, and Sepco. Provide the OEM part number or a photo and we cross-reference it to the matching Astra model.

Question 5

What materials are available?

Accepted Answer

Standard face combinations include Silicon Carbide (SiC) vs Carbon, SiC vs SiC, and Tungsten Carbide (TC) vs TC. Elastomers include Viton (FKM), EPDM, NBR, Aflas, Kalrez, and PTFE. Custom material specs are available for aggressive or high-purity media.

Spring Pusher Seal

AS Type 8-O

AS 5610V-43-GA-197516

AS 5610Q-38-GA-128706

AS 4610-65-GA-214821

AS 5610V-57-GA-215553

AS 59U

AS 586-100-GA-210770

AS 586-80-GA-210544

AS 5610VQ-1.75

AS 4STC-165

AS 5KSCB2S-43

AS 8B1BF-58-M10049-00

Spring Pusher Seal — Common Questions

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