초록 ▼

A tank blanketing valve in which a biased piston is positioned to control the flow of source gas into the tank. The piston is biased by a spring and a pilot gas stream from the source gas (the biasing pressure of force) to close the tank gas inlet. The pilot gas stream is controlled by a pressure se

A tank blanketing valve in which a biased piston is positioned to control the flow of source gas into the tank. The piston is biased by a spring and a pilot gas stream from the source gas (the biasing pressure of force) to close the tank gas inlet. The pilot gas stream is controlled by a pressure sensing component of the valve, whereby the pilot gas stream is directed away from the biased piston when the pressure in the tank is less than a predetermined pressure. This reduces the biasing pressure which is holding the piston in the gas inlet line to the tank. The pressure of the source gas on the piston in the source gas inlet line then exceeds the biasing pressure and causes the piston to slide open and admit source gas into the tank. When the pressure in the tank reaches the predetermined level the pressure sensing component responds and allows the pilot gas stream to be redirected to the piston and thereby to combine with the biasing pressure of the spring which then exceeds the pressure of the source gas in the inlet, forcing the piston to close off the inlet to any further flow of source gas into the tank.

대표청구항 ▼

A pressure balanced pilot valve comprising: a body having a chamber therein, an inlet and an outlet in fluid communication through said chamber, a neck extending rectilinearly into said chamber, said neck having an annular lip about the terminus thereof in said chamber, a spindle comprising: a hollo

A pressure balanced pilot valve comprising: a body having a chamber therein, an inlet and an outlet in fluid communication through said chamber, a neck extending rectilinearly into said chamber, said neck having an annular lip about the terminus thereof in said chamber, a spindle comprising: a hollow body, said hollow body being slidably mounted in said chamber on said neck, a rectilinear member extending from said chamber, said rectilinear member being operably associated with a pressure sensing means, a first annular seal positioned externally on said hollow body, proximal to said rectilinear member and aligned to operably engage a portion of the chamber to form a first fluid seal between said inlet and said outlet, a second annular seal positioned internally in said hollow body, distal to said rectilinear member and operably aligned to engage said annular lip and form a second fluid seal between said inlet and said outlet, and a port communicating the interior of said hollow body with said outlet, and a spring mounted in said hollow body tending to bias said seals to fluidly seal said inlet and outlet apart and to bias said rectilinear member toward said pressure sensing means whereby a reduction in pressure sensed by said pressure sensing means will unseat said seals and provide communication between said inlet and said outlet.