Abstract: A dual directional relief valve including a chamber within which is mounted a piston or valve member. The valve member is biased into a closed position covering and closing the open ends of two conduits. In the preferred embodiment, the conduits are respectively connected to opposite sides of a pump and the open ends of the conduits are concentrically positioned relative to each other. In operation and should dangerously high pressure develop on either side of the pump, the valve member will be opened and the high pressure relieved to pass harmlessly from one conduit to the other through the chamber. The valve member preferably has two surface portions of equal area covering the open ends of the conduits wherein the relief valve can be set to open when a predetermined pressure is exceeded in either conduit.

Abstract: Fluid inductor and metering device for handling and mixing concentrated chemicals such as herbicides and pesticides. In one mode of operation, the concentrated chemicals are first drawn by a transfer pump from their storage container or containers into a graduated chamber and thereafter added into a primary water flow in a metered manner. In addition to being operable in a batching manner, the apparatus of the present invention can also be used to continuously inject the concentrated chemicals into the primary water flow directly from their storage containers as well as to back flush water through the storage containers to clean them. In the preferred embodiment, all of these operations can be accomplished using only the force of one transfer pump and by the manipulation of a single valve member.