Sanitary frostproof hydrant

Claim 2

A sanitary and frostproof hydrant which comprises an outlet head having a water conducting passage therein, a return water overflow port in the side of said passage adjacent the discharge end thereof, an enlongated cylindrical housing having an inlet opening at one end thereof, a valve member for closing said opening, a riser communicating with the interior of the housing adjacent said housing end and the water conducting passage in said outlet head, a piston in fluid tight relation with the interior of the housing, means on the piston engageable with the valve member to open the valve when the piston is in a valve open position adjacent said end of the housing, means for advancing the piston along the housing between the valve open position and water storage position spaced from said end of the cylinder in which riser water is stored in the cylinder, the means for advancing the piston along the housing including a piston rod including a pair of telescopically engaged sections and spring means urging the sections to an extended position, the sections moving to a retracted position against the bias of the spring means as the piston is moved in valve opening direction into engagement with the valve member, the bias of the spring means being sufficient to cause the sections to move to extended position as the valve opens so that the valve opens quickly, said outlet head having a double acting check valve adjacent the discharge end of said water conducting passage therein and seatable to close said return water overflow port in the side of said passage while water is discharged through the outlet head and seatable to close the said passage upstream of the overflow port to divert return water through the overflow port and an air check valve to vent said outlet head water conducting passage to the atmosphere intermediate said riser and said double acting check valve only when water is not being discharged from said hydrant so that upon movement of said piston to water storage position, water does not stand in a portion of the riser wherein it might be frozen.

Claim 3

A sanitary and frostproof hydrant which comprises an outlet head having a water conducting passage therein, a return water overflow port in the side of said passage adjacent the discharge end thereof, an elongated cylindrical housing having an inlet opening at one end thereof, a valve member for closing said opening, a riser communicating with the interior of the housing adjacent said housing end and the water conducting passage in said outlet head, a piston in fluid tight relation with the interior of the housing, the piston including a body, a pair of cup-shaped gaskets each attached in sealing relation to a respective end of the body with a flange of each gasket in flatwise face-to-face engagement with the interior wall of the housing, and a cup-expander of resilient material attached to the body inside each cup-shaped gasket, each cup-expander including a plurality of outwardly extending teeth resiliently engaging the flange of the gasket associated therewith to hold the flange in sealing engagement with the wall of the housing, the gaskets supporting the piston in substantial alignment in the housing when cantedly directed forces are applied thereto by said piston advancing means and providing tandem seals between the ends of the piston, means on the piston engageable with the valve member to open the valve when the piston is in a valve open position adjacent said end of the housiNg, means for advancing the piston along the housing between the valve open position and water storage position spaced from said end of the cylinder in which riser water is stored in the cylinder, said outlet head having a double acting check valve adjacent the discharge end of said water conducting passage therein and seatable to close said return water overflow port in the side of said passage while water is discharged through the outlet head and seatable to close the said passage upstream of the overflow port to divert return water through the overflow port and an air check valve to vent said outlet head water conducting passage to the atmosphere intermediate said riser and said double acting check valve only when water is not being discharged from said hydrant so that upon movement of said piston to water storage position, water does not stand in a portion of the riser wherein it might be frozen.

Claim 4

A sanitary and frostproof hydrant which comprises an outlet head having a water conducting passage therein, a return water overflow port in the side of said passage adjacent the discharge end thereof, an elongated cylindrical housing having an inlet opening at one end thereof, a valve member for closing said opening, a riser communicating with the interior of the housing adjacent said housing end and the water conducting passage in said outlet head, a piston in fluid tight relation with the interior of the housing, the piston including a body, a pair of cup-shaped gaskets each attached in sealing relation to a respective end of the body with a flange of each gasket in flatwise face-to-face engagement with the interior wall of the housing, and a cup-expander of resilient material attached to the body inside each cup-shaped gasket, each cup-expander including a plurality of outwardly extending teeth resiliently engaging the flange of the gasket associated therewith to hold the flange in sealing engagement with the wall of the housing, the gaskets supporting the piston in substantial alignment in the housing when cantedly directed forces are applied thereto by said piston advancing means and providing tandem seals between the ends of the piston, means on the piston engageable with the valve member to open the valve when the piston is in a valve open position adjacent said end of the housiNg, means for advancing the piston along the housing between the valve open position and water storage position spaced from said end of the cylinder in which riser water is stored in the cylinder, said outlet head having a double acting check valve adjacent the discharge end of said water conducting passage therein and seatable to close said return water overflow port in the side of said passage while water is discharged through the outlet head and seatable to close the said passage upstream of the overflow port to divert return water through the overflow port and an air check valve to vent said outlet head water conducting passage to the atmosphere intermediate said riser and said double acting check valve only when water is not being discharged from said hydrant so that upon movement of said piston to water storage position, water does not stand in a portion of the riser wherein it might be frozen.

Claim 5

A sanitary and frostproof hydrant which comprises an elongated cylindrical housing having an inlet opening at one end thereof, a valve member for closing said opening, a riser communicating with the interior of the housing adjacent said end, a piston in fluid tight relation with the interior of the housing, means on the piston engageable with the valve member to open the valve when the piston is in a valve open position adjacent said end of the housing, and means for advancing the piston along the housing between the valve open position and a water storage position spaced from said end of the cylinder in which riser water is stored in the cylinder, which piston advancing means includes a piston rod including a pair of telescopically engaged sections and spring means urging the sections to an extended position, the sections moving to a retracted position against the bias of the spring means as the piston is moved in valve opening direction into engagement with the valve member, the bias of the spring means being sufficient to cause the sections to move to extended position as the valve opens so that the valve opens quickly.

Claim 6

A sanitary and frostproof hydrant which comprises an elongated cylindrical housing having an inlet opening at one end thereof, a valve member for closing said opening, a riser communicating with the interior of the housing adjacent said end, a piston in fluid tight relation with the interior of the housing, means on the piston engageable with the valve member to open the valve when the piston is in a valve open position adjacent said end of the housing, and means for advancing the piston along the housing between the valve open position and a water storage position spaced from said end of the cylinder in which riser water is stored in the cylinder, which piston advancing means includes a piston rod including a pair of telescopically engaged sections and spring means urging the sections to an extended position, the sections moving to a retracted position against the bias of the spring means as the piston is moved in valve opening direction into engagement with the valve member, the bias of the spring means being sufficient to cause the sections to move to extended position as the valve opens so that the valve opens quickly.

Claim 7

A sanitary and frostproof hydrant as in claim 3 wherein the piston includes a body, a pair of cup-shaped gaskets each attached in sealing relation to a respective end of the body with a flange of each gasket in flatwise face-to-face engagement with the interior wall of the housing, and a cup-expander of resilient material attached to the body inside each cup-shaped gasket, each cup-expander including a plurality of outwardly extending teeth resiliently engaging the flange of the gasket associated therewith to hold the flange in sealing engagement with the wall of the housing, the gaskets supporting the piston in substantial alignment in the housing when cantedly directly forces are applied thereto by said piston advancing means and providing tendem seals between the ends of the piston.