Abstract: A pressure regulating valve for an inkjet printhead. The valve includes: a fluid flow path defined between a valve inlet and a valve outlet; an orifice positioned in the flow path; a movable valve member configured for regulating a fluid flow rate through the orifice; a regulator chamber having the valve outlet and including a diaphragm operatively connected to the valve member, such that movement of the diaphragm moves the valve member relative to the orifice; and a biasing mechanism for resiliently biasing the diaphragm away from the orifice. An outer surface of the valve member is non-linearly flared away from the diaphragm.

Abstract: An ink delivery system for supplying ink to an inkjet printhead at a predetermined backpressure. The ink delivery system includes: a pressure regulating valve connected to a printhead inlet port; an ink tank connected to a valve inlet of the pressure regulating valve; and a pump connected to a printhead outlet port. The backpressure of ink supplied to the printhead is controlled by: a height h1 of ink in the ink tank relative to a valve orifice, a height h2 of the valve orifice relative to the printhead, a position of a valve member relative to the orifice and a pump speed of the pump.

Abstract: A pressure regulating valve for an inkjet printhead. The valve includes: a valve inlet connect to a valve outlet; via a flow path; a first orifice positioned in the flow path having a sealable first seat; a movable first valve member configured for sealing engagement with the first seat; a second orifice positioned in the flow path; a movable second valve member configured for regulating a fluid flow rate through the second orifice; a regulator chamber having the valve outlet and comprising a diaphragm operatively connected to the second valve member, such that movement of the diaphragm moves the second valve member relative to the second orifice; and a biasing mechanism for resiliently biasing the diaphragm away from the second orifice.