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An automatic air venting device including a venting cylinder communicating with the pressure side of an electromagnetic plunger pump down-stream of a discharge valve thereof, a valved plunger fitted in the venting cylinder for sliding reciprocatory movement, a valve mounted at an end of the valved p

An automatic air venting device including a venting cylinder communicating with the pressure side of an electromagnetic plunger pump down-stream of a discharge valve thereof, a valved plunger fitted in the venting cylinder for sliding reciprocatory movement, a valve mounted at an end of the valved plunger on the side of a return port, a valve seat located at the return port and adapted to be engaged by the valve when the internal pressure of the pump is above a predetermined value during operation of the pump, a spring urging the valve to be brought out of engagement with the valve seat, and a leak passage formed in the valved plunger for bringing the pressure side of the pump into communication with the return port when the valved plunger is urged by the spring to move in a direction in which the valve is brought out of engagement with the valve seat. When the internal pressure of the valve drops below the predetermined value as the pump draws air at initial stages of operation or draws air bubbles entrained in the liquid during operation of the pump, the valve is brought out of engagement with the valve seat and the pressure side of the pump is communicated with the return port through the leak passage, the air or air bubbles in the liquid are rapidly vented through the return port.

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An automatic venting device for an electromagnetic plunger pump including an electromagnetic coil, and an electromagnetic plunger mounted in sliding reciprocatory movement in a guide case extending through the electromagnetic coil on its center axis, the sliding reciprocatory movement of the electro

An automatic venting device for an electromagnetic plunger pump including an electromagnetic coil, and an electromagnetic plunger mounted in sliding reciprocatory movement in a guide case extending through the electromagnetic coil on its center axis, the sliding reciprocatory movement of the electromagnetic plunger being caused by an intermittent magnetic attracting force produced by energization of the electromagnetic coil with a pulse current and the biasing force of a return spring, so as to enable a pumping action to be performed with the cooperation of a suction valve and a discharge valve actuated simultaneously as energization of the electromagnetic coil, wherein said automatic venting device is arranged with a shut-off valve mechanism in a passage at the pressure side between the discharge valve of the pump and a discharge port of the pump, said automatic air venting device comprising: a venting cylinder which is at its one end flow-connected to said passage at the pressure side of the pump and at the other end flow-connected to a return port; a valved plunger fitted in the venting cylinder for sliding reciprocatory movement and formed at one end portion with a leak passage for gas communicating said passage at the pressure side of the pump with said return port; a valve mounted at the other end of the valved cylinder facing said return port; a valve seat arranged on said return port adapted to be brought into and out of engagement with the valve; a spring mounted between the valved plunger and the return port for urging the valve to be brought out of engagement with the valve seat to open the valve; and a return passage provided outside a pump body separately from an intake passage; said spring and said leak passage being set such that when the internal pressure of the pump rises above a predetermined pressure during operation of the pump, said leak passage is blocked by the liquid so that said valve is operative to be closed as it is brought into engagement with the valve seat, and that only when the pressure and flow rate of the liquid at the pressure side of the pump drops below the predetermined valve due to entrainment of the gas in the liquid, said lead passage allows gas or liquid containing gas to glow therethrough and the valve is brought out of engagement with the valve seat by the biasing force of the spring to thereby cause the gas or the liquid containing gas to flow through the return port and the return passage to be vented out of a pump body.