Frost-resistant hydrant

E - Fixed Constructions – 03 – B

Patent

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Details

E03B 9/08 (2006.01) E03B 9/14 (2006.01) F16K 1/46 (2006.01) F16K 17/196 (2006.01)

Patent

CA 2215994

A hydrant (10) has a conduit (12) that communicates with a fluid source at one end thereof and atmosphere at another end thereof. A valve cartridge (100) is positioned in the conduit (12) and includes a cartridge body (104) having a back-flow port (108) and a valve (42) mounted in the cartridge body (104). The valve (42) is movable between an open position allowing fluid flow through the valve (42) to atmosphere in a first direction and a closed position blocking fluid flow. An actuator stem (102) is connected with the valve (42) and extends away from the cartridge body (104) for manipulating the valve (42) between the open and closed positions. The actuator stem has a vacuum breaker port (122) that is axially spaced from the back-flow port (108). A check valve (124) is located in a fluid passage between the vacuum breaker port (122) and the back-flow port (108) for blocking the fluid from flowing through the valve cartridge (100) in a direction opposite to the first direction while permitting fluid flow to atmosphere. The check valve includes a seal member (126) for sealing the back-flow port (108) and a cooperating plunger member (128) for sealing the vacuum breaker port (122). The plunger member (128) is reciprocal with respect to the seal member (126). The plunger member (128) and the seal member (126) simultaneously seal the vacuum breaker port (122) and the back-flow port (108) when the plunger member is extended with respect to the seal member.

Cette invention concerne une prise d'incendie (10) qui comporte une conduite (12) raccordée à un bout à une source d'eau et, à l'autre bout, à l'atmosphère. Un bloc-robinet (102) disposé dans la conduite (120) comprend un corps (104) comportant une lumière de retour d'eau (108) et un obturateur (42). L'obturateur est mobile entre une position ouverte laissant passer l'eau à l'atmosphère et une position fermée où il empêche le passage de l'eau. Une tige de manoeuvre (102) saillant du bloc-robinet est raccordée à l'obturateur (42) pour la manoeuvre de celui-ci entre les positions ouverte et fermée. La tige de manoeuvre comporte une lumière brise-vide (122) espacée axialement de la lumière de retour d'eau (108). Un clapet de retenue (124) disposé entre la lumière brise-vide (122) et la lumière de retour d'eau (108) empêche l'écoulement de l'eau à travers le bloc-robinet (100) dans une direction opposée à la première tout en permettant son écoulement à l'atmosphère. Le clapet de retenue comprend un obturateur (126) servant à boucher la lumière de retour d'eau (108) et un plongeur à action conjuguée (128) qui ferme la lumière brise-vide (122). Le plongeur (128) est vis à vis l'obturateur (126) du clapet de retenue. Le plongeur (128) et l'obturateur (126) ferment simultanément la lumière brise-vide (122) et la lumière de retour d'eau (108) lorsque le plongeur est en position sortie par rapport à l'obturateur.

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