Abstract: A dry scroll vacuum pump includes a fixed scroll, a drive shaft having an axis and an eccentric shaft portion, an orbiting scroll connected to the eccentric shaft portion so that during use rotation of the shaft imparts an orbiting motion to the orbiting scroll relative to the fixed scroll for pumping gas between a mechanism inlet and a mechanism outlet of a scroll mechanism comprising the scrolls; an inlet vacuum region for conveying gas from the pump inlet to the mechanism inlet; a cooling flow path formed inside the orbiting scroll for guiding a cooling fluid for cooling the orbiting scroll, the cooling flow path having a fluid inlet; and a sealing arrangement for sealing the fluid inlet from the inlet vacuum region so a cooling fluid can be conveyed across the inlet vacuum region through the sealing arrangement to the fluid inlet.