The invention relates to a combined
water level control valve without a power source. When the combined
water level control valve is used, at first, a primary valve is mounted on a
water supply pipeline, a secondary valve is mounted in a field, a connecting hose is in
butt joint with union nuts which are arranged on the primary valve and the secondary valve, the combined
water level control valve without the power source is normally opened, and when a floating ball of the secondary valve drops, the planes of an ejecting rod and a guide
pipe form a space naturally, so that the pressure of the upper cavity of a membrane of the secondary valve is released, and at the moment, the secondary valve is opened; then the pressure of the upper cavity of the primary valve is released through the connecting hose, and at the moment, the primary valve is opened; and when the water level of the field is reached, the floating ball floats under the action of water
buoyancy, the round plane of the eccentric ejecting rod and the plane of the pressure releasing guide
pipe are naturally matched and sealed, so that the pressure of the upper cavities of the sealed membranes cannot be released, under the double actions of pressure balancing holes of the membranes and a reset spring,
water supply is stopped by virtue of the membranes of the secondary valve and the primary valve in sequence, and under non power source and unattended conditions,
water supply and water supply stop are repeated so as to achieve the automatic supply and automatic supply stopping functions. Since the combined water level control valve is reasonable in structure, and convenient to
mount, the combined water level control valve has a great market and popularization value.