Self-closing liquid/gas control valve

For interrupting the flow of a liquid under the propulsion of pressurized gas, a self closing valve comprising:

• a housing;
• an inlet port at one side, an outlet port at the other side of the housing and a hollow space extending therebetween;
• a first valve seat formed at said inlet port side of the said space;
• a second valve seat formed at said outlet port side of the space;
• a first, elongated freely slidable valve member placed within said space, comprising:
• a portion configured to close against said first valve seat;
• a blind bore, open at the outlet port side and extending in register therewith;
• a second, freely movable valve member placed within said bore, configured to close against the second valve seat;
• and
• an orifice communicating said bore with said space upstream of said first valve seat;
• the arrangement being such that during supply of the liquid through said inlet, the first valve member becomes displaced to allow the flow of the liquid through the first valve seat, around the first valve member and through said outlet, and upon the gas reaching the level of said orifice, the said second valve member becomes seated against said second valve seat to close said outlet.