1. An irrigation system comprising:
a plurality of circular pipes;
a plurality of plumbing fittings each having three legs extending in a \u201cY\u201d shape, the \u201cY\u201d shape having an angle of 120 degrees between each of its three legs, the pipes being connected to the legs of the plumbing fittings to form a network in which each pipe, in combination with legs of connected plumbing fittings, forms one side in a hexagonal shaped pipe network formation, all of the sides of each hexagonal shaped pipe network formation being of substantially equal length, the central axes in a flow direction of each of the pipes of the hexagonal shaped pipe network formation located in a common plane with one another, and
watering outlets fitted to alternate plumbing fittings.
2. The irrigation system as claimed in claim 1, wherein the watering outlets are sprinkler heads.
3. The irrigation system as claimed in claim 2, wherein the sprinkler heads are directly connected to the plumbing fittings.
4. The irrigation system as claimed in claim 2, wherein the sprinkler heads are connected to the plumbing fittings via risers or pop-up fittings.
5. An irrigation system comprising:
a plurality of circular pipes;
a plurality of plumbing fittings each having three legs extending in a \u201cY\u201d shape, the \u201cY\u201d shape having an angle of 120 degrees between each of its three legs, the pipes being connected to the legs of the plumbing fittings to form a network in which each pipe, in combination with legs of plumbing fittings connected at either end of the respective pipe, forms one side in a hexagonal shaped pipe network formation, all of the sides of each hexagonal shaped pipe network formation being of substantially equal length, the central axes in a flow direction of each of the pipes of the hexagonal shaped pipe network formation located in a common plane with one another, and
watering outlets fitted to each plumbing fitting.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A check valve for engaging a lid having through-hole and valve coupling part and controlling air flow through the through-hole, the check valve comprising:
a valve body part which is made of an elastic material, is provided with a concave part for providing on the bottom surface thereof an empty space higher than the edge thereof, and has a through-hole vertically formed therein;
a vacuum indicating part which is connected integrally to the valve body part along the inner wall surface of the through-hole at a position spaced downwardly from the top of the through-hole, is formed to be thinner than the thickness of the valve body part and protrude upwardly, and sinks toward a lid when negative pressure is generated in the space between the lid and the valve body part; and
a fixing part which is coupled to a valve coupling part so as to fix the valve body part to the valve coupling part.
2. The check valve of claim 1, wherein the vacuum indicating part is connected integrally to the valve body part along the inner wall surface of the through-hole at a position spaced upwardly from the bottom of the through-hole.
3. The check valve of claim 1, wherein a length of a cross-sectional surface of the vacuum indicating part is not less than a surface length of a bottom of the vacuum indicating part facing the cross-sectional surface of the vacuum indicating part, and wherein the surface length is a sum of a surface length of the lid facing the cross-sectional surface of the vacuum indicating part, a length from an end of the cross-sectional surface of the vacuum indicating part to a surface of the lid below the end, and a length from the other end of the cross-sectional surface of the vacuum indicating part to the surface of the lid below the other end.
4. The check valve of claim 1, wherein an edge protrusion is provided, which is formed continuously along an edge top surface of the valve body part so as to have a ring shape and protrudes upwardly.
5. The check valve of claim 1, wherein a handle is installed, which is provided protruding upwardly at an edge of the valve body part and configured for being grabbed by a hand of user and lifted by an edge of the valve body part so as to relieve vacuum state.
6. The check valve of claim 5, wherein the handle has a shape of rectangular cylinder, a protruding bump protruding outwardly on a top end of the handle, and an outer side surface of the handle is formed so as to be sloped inwardly as going upwardly from an edge of the valve body part.
7. The check valve of claim 1, wherein in a state of being installed in the lid through the fixing part the edge of the valve body part is pressed upwardly by a surface of the lid.
8. A vacuum container lid for opening or closing an opening of the container main body provided in an internal space for storing contents, the vacuum container lid comprising:
a lid body having a packing provided on a bottom surface so as to seal the opening of the container main body and formed with a through-hole and a valve coupling part; and
a check valve coupled to the valve coupling part and for controlling air flow through the through-hole,
wherein the check valve comprises:
a valve body part which is made of an elastic material, is provided with a concave part for providing on the bottom surface thereof an empty space higher than the edge thereof, and has a through-hole vertically formed therein;
a vacuum indicating part which is connected integrally to the valve body part along the inner wall surface of the through-hole at a position spaced downwardly from the top of the through-hole, is formed to be thinner than the thickness of the valve body part and protrude upwardly, and sinks toward a lid when negative pressure is generated in the space between the lid and the valve body part; and
a fixing part which is coupled to a valve coupling part so as to fix the valve body part to the valve coupling part.
9. The vacuum container lid of claim 8, wherein in the check valve, in a state of being installed in the lid through the fixing part, the edge of the valve body part is pressed upwardly by a surface of the lid even though negative pressure is not formed in the container main body.
10. The vacuum container lid of claim 8, wherein in the check valve, the edge of the valve body part is pressed upon the top surface of the lid by a catching bump formed a bottom side part of the fixing part and caught at a bottom surface of the lid through the valve coupling part.
11. The vacuum container lid of claim 9, wherein the edge of the valve body part is pressed upon the top surface of the lid, so that when pressing the lid installed in the container main body the air in the internal space of the container main body escapes to outside and generates an air-venting effect sound.
12. The vacuum container lid of claim 8, wherein the vacuum indicating part is connected integrally to the valve body part along the inner wall surface of the through-hole at a position spaced upwardly from the bottom of the through-hole.
13. The vacuum container lid of claim 8, wherein a length of a cross-sectional surface of the vacuum indicating part is not less than a surface length of a bottom of the vacuum indicating part facing the cross-sectional surface of the vacuum indicating part, and wherein the surface length is a sum of a surface length of the lid facing the cross-sectional surface of the vacuum indicating part, a length from an end of the cross-sectional surface of the vacuum indicating part to a surface of the lid below the end, and a length from the other end of the cross-sectional surface of the vacuum indicating part to the surface of the lid below the other end.
14. The vacuum container lid of claim 8, wherein an edge protrusion is provided, which is formed continuously along an edge top surface of the valve body part so as to have a ring shape and protrudes upwardly.
15. The vacuum container lid of claim 8, wherein a handle is installed, which is provided protruding upwardly at an edge of the valve body part and configured for being grabbed by a hand of user and lifted by an edge of the valve body part so as to relieve vacuum state.
16. The vacuum container lid of claim 8, wherein the handle has a shape of rectangular cylinder, a protruding bump protruding outwardly on a top end of the handle, and an outer side surface of the handle is formed so as to be sloped inwardly as going upwardly from an edge of the valve body part.
17. A check valve for engaging a lid having through-hole and valve coupling part and controlling air flow through the through-hole, the check valve comprising:
a valve body part which is made of an elastic material, is provided with a concave part for providing on the bottom surface thereof an empty space higher than the edge thereof, and has a through-hole vertically formed therein;
a vacuum indicating part which is connected integrally to the valve body part along the inner wall surface of the through-hole at a position spaced downwardly from the top of the through-hole, is formed to be thinner than the thickness of the valve body part and protrude upwardly, and sinks toward a lid when negative pressure is generated in the space between the lid and the valve body part; and
a fixing part which is coupled to a valve coupling part so as to fix the valve body part to the valve coupling part,
wherein the vacuum indicating part is connected integrally to the valve body part along the inner wall surface of the through-hole at a position spaced upwardly from the bottom of the through-hole,
and wherein in a state of being installed in the lid through the fixing part the edge of the valve body part is pressed upwardly by a surface of the lid.
18. The check valve of claim 17, wherein a length of a cross-sectional surface of the vacuum indicating part is not less than a surface length of a bottom of the vacuum indicating part facing the cross-sectional surface of the vacuum indicating part, and wherein the surface length is a sum of a surface length of the lid facing the cross-sectional surface of the vacuum indicating part, a length from an end of the cross-sectional surface of the vacuum indicating part to a surface of the lid below the end, and a length from the other end of the cross-sectional surface of the vacuum indicating part to the surface of the lid below the other end.
19. The check valve of claim 17, wherein an edge protrusion is provided, which is formed continuously along an edge top surface of the valve body part so as to have a ring shape and protrudes upwardly.
20. The check valve of claim 17, wherein a handle is installed, which is provided protruding upwardly at an edge of the valve body part and configured for being grabbed by a hand of user and lifted by an edge of the valve body part so as to relieve vacuum state.