Abstract: A tank for a pump is disclosed, which can accommodate a fluid for pumping, such as a chemical liquid. To a lower portion of a tank body which has a pump accommodation recess formed on one side, a weight member is removably secured. Prior to the securing, at the tank installation site the inner space of the weight member is filled with a weight material, such as water or sand, through an opening formed in the upper portion of the weight member. By so doing, when the residual quantity of the fluid for pumping in the tank body of the tank after the installation is reduced to be small, the tank is held in stable state by the weight of the weight member.

Abstract: In an electromagnetically-operated fixed displacement pump, a lubricating oil storage tank and a communicating hole with one end opening upon the bottom of the tank are formed in a pump body, the other end of the hole in the pump body communicating with one end of another communicating hole extending through a movable armature in the axial direction thereof, the other end of the communicating hole in the armature opening into an electromagnetic gap between a fixed armature and the movable armature.