Abstract: This liquid flow control apparatus is a delayed closure valve mechanism intended for use in an unloading bypass between the outlet and the inlet of a pump for supplying fuel to an oil burner. The valve mechanism includes a conduit having a large diameter section between two small diameter sections. A ball valve having a diameter smaller than the large diameter section and larger than the two small diameter sections is captured within the large diameter section. The large diameter section extends upwardly, so that the ball is biased by gravity to its inlet end. When the pump starts, the ball is moved by the discharge pressure of the pump until it engages the upper end of the large diameter section, whereupon the unloading bypass is closed and the discharge pressure of the pump is effective to open a cut-off valve leading to the nozzle of the oil burner. The length of the large diameter section determines the time delay between the starting of the pump and the delivery of oil to the nozzle of the burner.

Abstract: The pump drive shaft may rotate in either direction. The pump discharges liquid from the same port, regardless of the direction of rotation. A receiving port on the pump mounting pad is aligned with that discharge port. The pump includes a base plate, a pump plate and a cover plate, aligned with a stack. The pump has a single inlet diametrically opposite the point where the gears mesh. This inlet acts in either direction of rotation so that no valves are needed in the inlet passage. Two outlet ports are located respectively on opposite sides of the mesh point. All fluid passages and a valve means which selects one outlet port or the other, depending on the direction of rotation, are located in the base plate. All valves are simple structures trapped in chambers between the base plate and the pump plate, or between the base plate and the mounting pad. The inlet is made narrower than the teeth on the gears to prevent cavitation.

Abstract: This drip preventing valve is adapted to be installed in a conduit between the discharge outlet of an oil burner pump and the nozzle. The valve responds to the pressure in that conduit and closes whenever the pump stops, thereby preventing leakage or dripping from the nozzle. This valve consists of a body of one or more closed, flexible-walled cells, filled with air at atmospheric pressure. When the valve body is subjected to a greater pressure, it is compressed, thereby opening the valve. When that greater pressure is relieved, the valve closes.

Abstract: The pump drive shaft may rotate in either direction. The pump discharges liquid from the same port, regardless of the direction of rotation. A port on the pump mounting pad, which receives the discharge from the pump, may be in any of various locations. The pump has plural discharge ports at different locations on its base plate, one of which is aligned with the receiving port on the mounting pad. Any discharge port not used in any particular embodiment is blocked. The pump includes a base plate, a pump plate and a cover plate, aligned in a stack. In one modification, all fluid passages and a valve means which controls the direction of the flow are located in the base plate. In other modifications, a valve plate is provided, and the valve means is located in the valve plate. The fluid passages may be completely in the valve plate or partly in some of the other plates. All valves are simple structures trapped in chambers between or within the plates.

Abstract: This pump is driven by a shaft which may rotate in either direction. The direction of flow of fluid at the inlet and outlet ports of the pump may be maintained the same regardless of the direction of rotation. When the pump is set for one direction of rotation, it may be adapted for use with the other direction of rotation by removing a single plate, turning the plate over, and replacing it. The plate is held by bolts whose removal does not cause disassembly of any other parts.