H75 Replacement Mechanical Seal

A Multi-Spring Equivalent for Larger Stepped Shaft Pumps

Fitting the H75 equivalent seal follows the same stepped-shaft installation approach as the H7N, but with individually sleeved springs that need even compression across the full circumference before the stationary seat is aligned and locked in the gland. The multiple-spring-in-sleeve arrangement is what makes this variant practical on larger shaft diameters, where a single Super-Sinus spring would struggle to apply consistent closing force, and it also allows for a noticeably wider axial movement tolerance to accommodate larger pumps with more shaft float. It carries the same high-pressure, high-temperature capability as the rest of the H7 platform, making it a dependable choice for large boiler feed, refining, and petrochemical pumps. For complete step-by-step installation instructions and torque specifications, refer to our detailed installation guide on the blog.