Hose coupling for a hydrant, and hydrant
A hose coupling for a hydrant has a ventilation device. The ventilation device has a non-return valve that is received in a receptacle incorporated into an outer flange of the hose coupling.
1. A hose coupling ( 10 ) for a hydrant, wherein the hose coupling ( 10 ) comprises a ventilation device ( 18 ), wherein the ventilation device ( 18 ) comprises a non-return valve ( 20 ), which is accommodated in a receptacle ( 22 ) incorporated into an outer flange ( 24 ) of the hose coupling ( 10 ),
wherein the ventilation device ( 18 ) further comprises a ventilation path ( 42 ) between the receptacle ( 22 ) and the interior of the hydrant, and
wherein the ventilation path ( 42 ) comprises a first path ( 44 ) extending in the external flange ( 24 ) between the receptacle ( 22 ) and an external thread ( 14 ) of the hose coupling ( 10 ), and a second path ( 46 ) adjoining the first path ( 44 ), the second path ( 46 ) being formed as a recess incorporated in the external thread ( 14 ) of the hose coupling ( 10 ) in the axial direction thereof or the second path ( 46 ) being formed as a longitudinal bore within the material of the outer edge of the hose coupling ( 10 ).
2. The hose coupling ( 10 ) according to claim 1 , wherein the non-return valve ( 20 ) comprises a bushing ( 26 ) insertable at least in sections into the receptacle ( 22 ) and a valve body ( 28 ) inserted at least in sections into the bushing ( 26 ) and adjustable in the axial direction of the bushing ( 26 ).
3. The hose coupling ( 10 ) according to claim 2 , wherein the valve body ( 28 ) comprises a cylinder section ( 32 ), which is inserted at least in sections into the bushing ( 26 ) and can be guided therein in the axial direction, and a stop ( 36 ) adjoining the cylinder section ( 32 ).
4. The hose coupling ( 10 ) according to claim 3 , wherein the stop ( 36 ) projects radially above the cylinder section ( 32 ).
5. The hose coupling ( 10 ) according to claim 3 , wherein the stop ( 36 ) is adjustable in a section of the receptacle ( 22 ) between the bushing ( 26 ) and an end surface ( 34 ) of the receptacle ( 22 ).
6. The hose coupling ( 10 ) according to claim 3 , wherein the non-return valve ( 20 ) further comprises a ring seal ( 38 ) arranged to circumferentially seal the stop ( 36 ) from the end face of the bushing ( 26 ) facing the stop ( 36 ) when the non-return valve ( 20 ) is in the closed state.
7. The hose coupling ( 10 ) according to claim 6 , wherein the ring seal ( 38 ) is placed in a section around the cylinder portion ( 32 ).
8. The hose coupling ( 10 ) according to claim 6 , wherein the end face of the bushing ( 26 ) facing the stop ( 36 ) is formed with a conically shaped sealing surface.
9. The hose coupling ( 10 ) according to claim 2 , wherein the bushing ( 26 ) is cylindrical in shape and is provided at least in sections with an external thread, designed to be accommodated by threading in an internal thread correspondingly incorporated into the receptacle ( 22 ).
10. The hose coupling ( 10 ) according to claim 3 , wherein the stop ( 36 ) is provided with at least one projection on a side facing the end surface ( 34 ) of the receptacle ( 22 ).
11. The hose coupling ( 10 ) according to claim 3 , wherein the stop ( 36 ) is of convex design on a side facing the end surface ( 34 ) of the receptacle ( 22 ).
12. The hose coupling ( 10 ) according to claim 1 , wherein the non-return valve ( 20 ) further comprises a resilient return element ( 30 ) clamped between the bushing ( 26 ) and the valve body ( 28 ), wherein the resilient return element ( 30 ) applies a force to the valve body ( 28 ) in a direction to open the non-return valve ( 20 ).
13. The hose coupling ( 10 ) according to claim 12 , wherein the resilient return element ( 30 ) resiliently pretensions the valve body ( 28 ) relative to the bushing ( 26 ) in such a way that the stop ( 36 ) abuts an end surface ( 34 ) of the receptacle ( 22 ).
14. The hose coupling ( 10 ) according to claim 1 , wherein an opening of the first path ( 44 ) is inserted eccentrically into the end surface ( 34 ) of the receptacle ( 22 ).
15. The hose coupling ( 10 ) according to claim 1 , further comprising a backflow preventer ( 12 ).
16. A hydrant, comprising the hose coupling ( 10 ) according to claim 1 , designed to reduce a difference between the pressure in the interior of the hydrant and the pressure of the outside atmosphere.