Classifications

• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G25/00—Watering gardens, fields, sports grounds or the like
  • A01G25/16—Control of watering
  • A01G25/165—Cyclic operations, timing systems, timing valves, impulse operations

Definitions

• the known device comprises a main valve with a valve body formed as a differential piston, having a small-bore c-antral through duct to its major side, a duct from this major side to a control valve which is arranged to close and open the main valve when it closes and opens said duct. as well as a pivoting means with an open bowl, arranged to be supplied with water from a drop means controlled by the control valve and.
• the present invention relates to a method fulfilling precisely these desires, and an apparatus for carrying out the method.
• Figure 1 is a longitudinal section through an embodiment of a device in accordance with the invention, in a position for irrigation.
• FIG. 2 illustrates a detail on the embodiment shown in
• Figure 1 in a closing position.
• Figure 3 is a section along the line III-III in Figure 1 and
• Figure 4 is a section along the line IV-IV in Figure 2.
• a casing 11 enclosing the device is put together from two parts which slide into each other with a substantially flat bottom 21 having perforations 22 and a roof 33 provided with a rainwater collecting depression 12. the substantially flat bottom of which is provided with perforations 13.
• the bottom 21 carries a main valve 1 with an inlet 2 projecting out of the casing 11 and arranged for connection to a water pipe, as well as an outlet 3 arranged for connection to irrigation apparatus, (not shown).
• the main valve 1 comprises a valve body 4 formed as a differential piston with a narrowgauge central bore 5 to its major side, from which a duct 6 goes substantially vertically to a control valve 7 with a vertical spindle 25 carrying a float 26 fastened thereto.
• the float is surrounded by an upwardly open circular bowl 27 with an overflow 28 and a side opening 29.
• the wall 34 of the bowl 27 dilates upwardly.
• a cover 30 with a central opening for the spindle 25 is provided with a dependent rim 32 fitting rotatably in the bowl 27 and with a narrow groove 31 opposite the side opening 29 of the bowl 27.
• the width of the groove 31 substantially corresponds to the side opening 29.
• the one 8 is upwardly open and situated under the casing depression 12 and under the drop means 9.
• the other bowl 14 carries a closed air chamber 15 from the roof of which a projection 10 formed as an arm extends in over the spindle 25.
• the air chamber 15 is cbnnected to the open bowl 8 by means of a narrow transverse slit 17 adjacent the common bottom 16, and by means of at least one duct 18 going to the opposite end of the open bowl 8 with a narrow lengthwise slit 20 adjacent the bottom 16.
• the cross section of the duct 18 can be optionally formed, all that is important is that its roof height rises continuously from being negligibly larger than the width of the slit 20 at the furthermost end of the open bowl 8 to a maximum at its opening into the air chamber 15, the height of the opening being determined by the quantity of water desired to be retained in the air chamber 15 and the air volume of the latter.
• the opening height must be somewhat larger than the sum of the width of the slits 17.20 and the maximum difference in the day and night levels of the water in the air chamber 15.
• a staircaseshaped block 23 under the air chamber end such that it can be displaced towards the pivoting shaft 35.
• the apparatus functions in the following way: Starting from the situation where the open bowl 8 is full of water and has caused the pivoting means to tip in this direction.
• the projecting portion of arm 10 engages against the spindle 25 so that the latter presses the control valve 7 sealingly arainst its seating.
• the pressure against the major side 36 of the differential piston 4 will be equal to the pressure in the water pipe and cause the main valve 7 to close the flow to the irrigation installation.
• the water in the float bowl 27 has dropped down from the drop means 9 into the open bowl 8 so that the float chamber 27 is empty and the weight of the float 26 coacts with the arm 10 to keep the control valve 7 in a closing position.
• the water in the open bowl 8 will evaporate and depart through the perforations 13.
• the pressure of the arm 10 against the spindle 25 is thus reduced, while the water enclosed in the air chamber 15 will remain substantially unaltered.
• the water pressure propagated via the through bore 5 in the differential piston 4, and the duct 6 to the control valve 7 will press against the control valve 7 so that it opens somewhat and lets water into the float bowl 27.
• the float 26 presses the spindle 25 upwards towards the arm 10 so that this causes the tilting means to tip over towards the air chamber side.
• the float bowl 27 Since the float bowl 27 is now filled to the overflow 28, water will pass out through the groove 31 and side opening 29 to the drop means 9 from which it drops down onto the open bowl 8 at a rate which can be adjusted by turning the lid or cover 30.
• the weight of water in the open bowl 8 When the weight of water in the open bowl 8 has risen to a given value, it causes the tipping means to tip back again to the starting position, and via the arm 10 press the control valve 7 and main valve 1 to a closing position.
• the water in the float bowl 27 drops down into the open bowl so that the float 26 will coact with the arm 10 to keep the valves 1 and 7 in a closing position, whereafter the sequence described above starts once again.
• the air in the airchamber 15 naturally alters its temperature in accordance with that of the surroundings and thereby also its volume. This results in that a portion of the water in the bottom basin of the air chamber 15 will be pressed out into the open bowl 8 via the transverse slit 17 during the day and sucted back again during the night. In turn, this results in that the tipping means will be in an opening position during irrigation times, i.e. tipped towards the edge chamber side during the night and in a closing position during the day. Irrigation thus always takes place at night, which is just what is best for plant growth and the intention with the air chamber 15.
• the block 23 is so displaceable that its steps 24 form stops limiting the tipping angle.

Landscapes

• Engineering & Computer Science (AREA)
• Water Supply & Treatment (AREA)
• Life Sciences & Earth Sciences (AREA)
• Environmental Sciences (AREA)
• Self-Closing Valves And Venting Or Aerating Valves (AREA)
• Fluid-Driven Valves (AREA)
• Massaging Devices (AREA)
• Domestic Plumbing Installations (AREA)
• Float Valves (AREA)
• Drying Of Solid Materials (AREA)
• Control Of Non-Electrical Variables (AREA)
• Safety Valves (AREA)
• Threshing Machine Elements (AREA)
• Water Treatment By Sorption (AREA)
• Nozzles (AREA)
• Sanitary Device For Flush Toilet (AREA)
• Mechanically-Actuated Valves (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20336168

Family Applications (1)

Country Status (13)

Cited By (3)

Families Citing this family (2)

Citations (3)

• 1978
  • 1978-10-23 SE SE7811004A patent/SE414364B/sv not_active IP Right Cessation
• 1979
  • 1979-10-22 AT AT79901473T patent/ATE2597T1/de active
  • 1979-10-22 DE DE7979901473T patent/DE2964919D1/de not_active Expired
  • 1979-10-22 JP JP54501859A patent/JPS6261293B2/ja not_active Expired
  • 1979-10-22 FI FI793271A patent/FI61387C/fi not_active IP Right Cessation
  • 1979-10-22 WO PCT/SE1979/000213 patent/WO1980000777A1/en unknown
  • 1979-10-22 NO NO793390A patent/NO147201C/no unknown
  • 1979-10-23 AU AU52078/79A patent/AU544595B2/en not_active Ceased
  • 1979-10-23 BE BE0/197786A patent/BE879589A/fr not_active IP Right Cessation
  • 1979-10-23 IE IE2022/79A patent/IE48971B1/en unknown
• 1980
  • 1980-02-18 DK DK069280A patent/DK150691C/da active
  • 1980-05-07 EP EP79901473A patent/EP0020558B1/en not_active Expired
  • 1980-06-20 SU SU802937848A patent/SU1050542A3/ru active

Patent Citations (3)

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