Three-screw pump
Thread Content
This post was last edited by Anhui Liu Hua on 2026-4-17 at 12:24. Everyone is welcome to discuss the structure of three-screw pumps, as well as the function of the steel ball and spring located above the mechanical seal.
I happen to know the detail the poster is asking about! This spring and steel ball mechanism is primarily used to balance the axial thrust generated during the operation of the screw, while also compensating for the wear of the mechanical seal, thereby keeping the sealing surfaces in close contact and reducing the risk of medium leakage. However, the structural details of pumps from different manufacturers may vary slightly; to obtain accurate information, it is best to refer to the original manufacturer’s manual for this pump or consult a professional after-sales service team~
This interpretation seems strange. Is it a device related to the pressure in the sealed chamber?
It must be the safety valve of the mechanical seal; I can think of no other explanation.