a) To keep the seal faces together while the pump is operating?
b) To keep the seal faces together while the pump is not operating?
c) To compensate for misalignment
d) All of the above
ANSWER : (b) Contrary to popular belief, the primary function of this spring is to keep the seal faces together when the pump is not operating (turned off). It is the hydraulic pressure of the pumped fluid within the seal chamber that keeps the seal faces together during operation. The elastomer diaphragm (bellows) within the rotary head of the seal will flex to compensate for misalignment.
