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US 3,937,439 AGranted
Thermally operated valve utilizing gas adsorbent material
AssigneeRobertshaw Controls Company
InventorsHugh J. Tyler, Denis G. Wolfe
Life of this patent
Estimating the term…
Abstract
A thermally operated valve utilizes a member which is moved in accordance with the pressure of a gas within a chamber containing an adsorbent carbon material formed from a compound of carbon and a non-carbon component wherein the non-carbon component has been removed leaving a porous structure with cavities of sufficient size to receive and adsorb the gas.
Claims16
A thermally operated valve comprising
- a valve seat,
- a valve member for closing and opening the valve seat,
- means forming an enclosed chamber,
- an adsorbent carbonaceous material in the chamber,
- a charge of gas in the chamber,
- means responsive to the pressure of the gas in the chamber for moving the valve member relative to the valve seat, and
- said adsorbent carbonaceous material being formed from a synthetic polymer selected from the group consisting of polyvinylidene chloride and polyvinylidene fluoride by removing the hydrogen and halogen components from the synthetic polymer to leave a porous carbonaceous skeletal structure with cavities, and
- said charge of gas including molecules which have a width smaller than the width of the cavities such that the molecules are readily adsorbed and desorbed in the cavities upon decrease and increase, respectively, of temperature.
5 more elements
A thermally operated valve comprising
- a housing having an inlet and an outlet with a valve seat interposed between the inlet and the outlet;
- a valve member for closing the valve seat;
- a sensing bulb having a chamber;
- an adsorbent carbonaceous material in the chamber;
- a charge of gas in the chamber;
- means responsive to the pressure of the gas in the chamber for moving the valve member relative to the valve seat;
- said adsorbent carbonaceous material having cavities wherein a substantial majority of the cavities have inlets which have a width in the range of about 9.2 to 17 angstroms;
- said gas charge including gas molecules having widths which are smaller than the widths of the substantial majority of cavities so as to be readily adsorbed and desorbed in the cavities upon decrease and increase, respectively of temperature.
5 more elements
A thermally operated valve comprising
- a housing having an inlet and an outlet with a valve seat interposed between the inlet and the outlet;
- a valve member for closing the valve seat;
- a sensing bulb having a chamber;
- an adsorbent carbonaceous material in the chamber;
- a charge of gas in the chamber;
- and
- means responsive to gas pressure in the chamber for moving the valve member relative to the valve seat;
- said adsorbent carbonaceous material being porous with cavities wherein a substantial majority of the cavities have substantially uniform widths in the range of about 9.2 to 17 angstroms throughout portions of the depths of the cavities;
- and
- said charge of gas including gas molecules having widths which are smaller than the widths of the substantial majority of cavities so as to be readily adsorbed and desorbed in the cavities upon decrease and increase, respectively, of temperature.
7 more elements
A thermally operated valve comprising
- a housing having an inlet and an outlet with a valve seat interposed between the inlet and the outlet;
- a valve member for closing the valve seat;
- a sensing bulb having a chamber;
- porous carbonaceous granules in the bulb, formed by substantially complete pyrolytic decomposition of synthetic polymer granules containing polyvinylidene chloride in a purifying atmosphere at a temperature in the range of 138.degree.C to 177.degree.C;
- a charge of gas in the chamber, selected from the group consisting of helium, neon, argon, krypton and xenon;
- and
- expandable and retractable means responsive to the gas pressure in the chamber for moving the valve member relative to the valve seat.
4 more elements
A flame responsive valve comprising
- a valve seat,
- a flame sensing bulb positioned in the path of a flame,
- gas pressure responsive means for moving the valve member relative to the valve seat,
- a tube connecting the pressure responsive means to the flame sensing bulb,
- a quantity of granular adsorbent material in the flame sensing bulb,
- said adsorbent material formed by pyrolytic decomposition of polyvinylidene chloride to form a porous carbonaceous structure with cavities of sufficient size to receive and adsorb monatomic molecules of gas,
- a charge of gas in the flame sensing bulb, tube and gas pressure responsive means, said charge of gas being selected from krypton and xenon.
4 more elements
Dependencies are inferred from the claim text.