The invention provides a pump assembly comprising a suction pump and a safety valve arranged between the pump inlet and a fluid inlet for the assembly. The method includes defining a plurality of policy configuration files for each tenant of the SaaS application. An exporting program for data associated with geometrical entities is substituted in at least one of the at least one display programs, the exporting program having the same display functions as the at least one display program. Energy saving is achieved by guaranteeing only one regular read strobe, even when multiple write accesses occur during one read access. At least one hydraulic brake assembly movably is mounted on the at least one connecting portion of the carrier body. The multi-display apparatus includes a first display panel, a second display panel disposed to overlap at least a portion of the first display panel, a transparent plate disposed only on the second display panel, or on both the first display panel and the second display panel, and a transparent window disposed on an area corresponding to the first display panel and the second display panel.