Sanitary hydrant
First Claim
Patent Images
1. A sanitary hydrant, comprising:
- a casing comprising an inlet in a lower end thereof and a removable cap on an upper end thereof, the removable cap comprising a first aperture;
an elongated external pipe extending through the first aperture and into the casing, the external pipe comprising an upper external pipe end portion outside of the casing and a lower external pipe end portion inside of the casing;
an internal fluid pipe extending within the external pipe, the internal fluid pipe comprising an upper fluid pipe end portion and a lower fluid pipe end portion;
a head interconnected to the upper external pipe end portion, the head comprising a first fluid channel in fluid communication with the internal fluid pipe, the first fluid channel terminating in a fluid outlet;
a diverter valve interconnected to the head and associated with the first fluid channel to selectively allow outside air to enter the first fluid channel;
a knob operatively interconnected to the head, the knob interconnected to the upper fluid pipe end portion with a stem screw such that rotation of the knob causes the internal fluid pipe to translate vertically between a first position and a second position;
a canister slidably interconnected to the casing, the canister comprising;
an internal wall;
a fitting interconnected to an upper portion of the internal wall and the lower external pipe end portion, the fitting comprising a second aperture through which the lower fluid pipe end portion extends;
a canister end interconnected to a lower end of the internal wall, the canister end comprising a second fluid channel;
a canister floor positioned between the fitting and the canister end and comprising a third aperture; and
a valve extending through at least a portion of the second fluid channel and at least a portion of the third aperture, the valve selectively displaceable from a closed position to an open position, the open position allowing fluid to flow from the inlet of the casing into the internal fluid pipe via the second fluid channel and the third aperture; and
a piston head interconnected to the lower fluid pipe end portion and slidably engaged with the internal wall of the canister, the piston head configured to translate vertically within the canister, the piston head positioned adjacent the fitting when the internal fluid pipe is in the first position and adjacent the canister floor when the internal fluid pipe is in the second position, the piston head further configured to switch the valve to the open position when the internal fluid pipe is in the second position.
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Accused Products
Abstract
A sanitary hydrant comprises an isolated reservoir that can be positioned below a freeze level at the location of installation. A piston within the isolated reservoir is operable to expel, during a downward stroke, stored fluid from the reservoir before actuating a valve that allows fluid to flow from a fluid supply source through the hydrant. On an upward stroke, the piston releases the valve and generates a negative pressure within the reservoir that draws fluid from within the hydrant into the reservoir.
223 Citations
20 Claims
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1. A sanitary hydrant, comprising:
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a casing comprising an inlet in a lower end thereof and a removable cap on an upper end thereof, the removable cap comprising a first aperture; an elongated external pipe extending through the first aperture and into the casing, the external pipe comprising an upper external pipe end portion outside of the casing and a lower external pipe end portion inside of the casing; an internal fluid pipe extending within the external pipe, the internal fluid pipe comprising an upper fluid pipe end portion and a lower fluid pipe end portion; a head interconnected to the upper external pipe end portion, the head comprising a first fluid channel in fluid communication with the internal fluid pipe, the first fluid channel terminating in a fluid outlet; a diverter valve interconnected to the head and associated with the first fluid channel to selectively allow outside air to enter the first fluid channel; a knob operatively interconnected to the head, the knob interconnected to the upper fluid pipe end portion with a stem screw such that rotation of the knob causes the internal fluid pipe to translate vertically between a first position and a second position; a canister slidably interconnected to the casing, the canister comprising; an internal wall; a fitting interconnected to an upper portion of the internal wall and the lower external pipe end portion, the fitting comprising a second aperture through which the lower fluid pipe end portion extends; a canister end interconnected to a lower end of the internal wall, the canister end comprising a second fluid channel; a canister floor positioned between the fitting and the canister end and comprising a third aperture; and a valve extending through at least a portion of the second fluid channel and at least a portion of the third aperture, the valve selectively displaceable from a closed position to an open position, the open position allowing fluid to flow from the inlet of the casing into the internal fluid pipe via the second fluid channel and the third aperture; and a piston head interconnected to the lower fluid pipe end portion and slidably engaged with the internal wall of the canister, the piston head configured to translate vertically within the canister, the piston head positioned adjacent the fitting when the internal fluid pipe is in the first position and adjacent the canister floor when the internal fluid pipe is in the second position, the piston head further configured to switch the valve to the open position when the internal fluid pipe is in the second position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A sanitary hydrant, comprising:
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a cylindrical casing comprising; an inlet in a first end thereof; and a removable cap on a second end thereof, the removable cap comprising an opening; an outer pipe coaxial with the casing and positioned within the opening, the outer pipe comprising an upper end outside of the casing and a lower end inside of the casing; an inner pipe extending through the outer pipe and coaxial with the casing, the inner pipe comprising an upper end and a lower end, the inner pipe axially translatable between a first position and a second position; a cylindrical canister slidably contained within and coaxial with the casing, the canister comprising; an upper portion interconnected to the lower end of the outer pipe, the upper portion comprising an opening through which the lower end of the inner pipe extends into the canister; a lower portion interconnected to the inlet of the casing; a fluid reservoir in fluid communication with the inner pipe; and a valve positioned within the lower portion that provides fluid communication between the inlet of the casing and the fluid reservoir; and a piston head interconnected to the lower end of the inner pipe and slidingly positioned within the canister, the piston head configured to open the valve when the inner pipe is in the first position. - View Dependent Claims (16, 17, 18)
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19. A method of utilizing a self-contained reservoir to prevent contamination of a water source, the method comprising:
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channeling water from an underground inlet to an above-ground outlet via an internal fluid pipe, a lower end of the internal fluid pipe terminating in a piston head disposed within a canister, the piston head engaging a valve in a lower portion of the canister to allow water to flow from the underground inlet into the internal fluid pipe, the underground inlet and the canister positioned below a frost line; raising the piston head with the internal fluid pipe to create the self-contained reservoir within the canister, the raising causing the piston head to disengage the valve, the disengaged valve blocking fluid flow from the underground inlet into the self-contained reservoir; collecting water from the internal fluid pipe in the self-contained reservoir; and lowering the piston head with the internal pipe, the lowering piston head pressurizing the self-contained reservoir to force collected water to flow out of the self-contained reservoir toward the above-ground outlet via the internal fluid pipe and then engaging the valve. - View Dependent Claims (20)
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Specification