Freeze-proof, pollution free valve

A valve comprising a substantially closed cylinder having a first end and a second end, said valve being divided by a transverse partition into a first portion and a second portion, a first piston reciprocable in said first portion and a second piston reciprocable in said second portion, first means for causing said pistons to move together, resilient means biasing said pistons toward said first end, manually operable second means for admitting fluid under pressure into said first portion near said first end, third means for transmitting fluid from said second end to a point remote from said valve, an opening in said first piston permitting constricted fluid flow from said first end past said first piston, fourth means transmitting fluid from said first end of said first portion through said first means and through said second piston, fifth means cutting off flow through said third means when said second means is open and also when said second piston is moved toward said first end when said second means is closed, sixth means activates said fifth means when said second piston is adjacent said second end to allow fluid to flow from said fourth means into said third means, and when said second means is open said pistons are moved away from said first end by fluid pressure and when said second means is closed said resilient means biases said pistons away from said second end, said second piston thereby sucking fluid out of said third means.