Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
  • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
  • F17D3/00—Arrangements for supervising or controlling working operations
  • F17D3/14—Arrangements for supervising or controlling working operations for eliminating water
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16T—STEAM TRAPS OR LIKE APPARATUS FOR DRAINING-OFF LIQUIDS FROM ENCLOSURES PREDOMINANTLY CONTAINING GASES OR VAPOURS
  • F16T1/00—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers
  • F16T1/12—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers with valves controlled by excess or release of pressure
  • F16T1/16—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers with valves controlled by excess or release of pressure involving a high-pressure chamber and a low-pressure chamber communicating with one another, i.e. thermodynamic steam chambers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16T—STEAM TRAPS OR LIKE APPARATUS FOR DRAINING-OFF LIQUIDS FROM ENCLOSURES PREDOMINANTLY CONTAINING GASES OR VAPOURS
  • F16T1/00—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers
  • F16T1/12—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers with valves controlled by excess or release of pressure
  • F16T1/16—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers with valves controlled by excess or release of pressure involving a high-pressure chamber and a low-pressure chamber communicating with one another, i.e. thermodynamic steam chambers
  • F16T1/165—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers with valves controlled by excess or release of pressure involving a high-pressure chamber and a low-pressure chamber communicating with one another, i.e. thermodynamic steam chambers of disc type

Definitions

• the present invention relates to a method for controll ⁇ ing the drainage of liquid from a liquid-containing pres ⁇ sure-gas conduit, with the aid of a valve arranged in a drainage channel, and also to a drainage valve for carrying out the method.
• the present invention is not concerned with devices of this kind, but relates more specifically to small, inexpen ⁇ sive devices which require only a small amount of space and which can be used, for instance, in conjunction with small compressors into which oil is injected.
• Compressors of this kind normally include a suitably located nozzle means which constantly drains-off gas and liquid. The smaller the comp ⁇ ressor the more sensitive it becomes to the loss of gas through drainage. Consequently, it is normal practice to instal a valve which will open periodically so as to drain off gas and liquid intermittently over a given active pe ⁇ riod, e.g. a period of 10 seconds duration.
• the active area of the nozzle or valve may not be made too small, however, since the flow of liquid separated may be quite large at times.
• the object of the present invention is to provide a so ⁇ lution which while overcoming the aforesaid problems will not be encumbered with the aforementioned drawbacks.
• the liquid to be drained from, for example, a liquid separator is enabled to flow through two constrictions which are coupled in series in a drainage channel and which can be closed with the aid of a valve bo ⁇ dy in response to a pressure increase that occurs there- between when gas instead of liquid passes through the first constriction as seen in the flow direction, this pressure increase being allowed to attenuate through a leakage passage, past the other constriction until the valve re ⁇ opens and detects either the presence of liquid or of gas at the first constriction, in which latter case the valve is again closed.
• the valve is opened periodically at a frequency which is dependent on the negligible leakage past the second constriction.
• the valve according to the present invention is closed immediately the presence of gas instead of liquid is detected in the first constriction, therewith preventing gas from being lost from the system without restricting the drainage capacity thereof.
• a drainage valve for carrying out the method according to the invention has the features set forth in the charac ⁇ terizing clause of claim 2.
• FIG. 1 illustrates schematically a channel for flowing fluid
• FIG. 2 is a longitudinal sectional view of a valve constructed to illustrate the inventive method
• FIG. 3 is a longitudinal sectional view of a valve constructed in accordance with a preferred embodiment of the invention, said view being taken on the line III-III in Figure 4;
• - Figure 4 is a cross-sectional view taken on the line IV-IV in Figure 3;
• FIG. 5 is an enlarged view of part of the valve illustrated in Figure 3.
• a liquid flows through a channel 1 that incorporates two identical and mutually sequential restrictions A and B
• the drop in pressure across the two constrictions A and B will be the same, i.e. in the case of the indicated pressures p-,, P2, P3, p ⁇
• - p 2 will 2 - P3-
• Both of the constrictions have an active surface area A-, .
• the pressure between the constrictions is designated 2•
• the constrictions A and B can be closed by means of a common valve body 4, which presents a piston in the axial extension thereof.
• the piston extends into a cylindrical chamber 6 connected to the channel 1.
• the piston 5 has a larger active area than the constrictions A and B and is also provided with a pressure equalizing channel 7 which equalizes the pressure on both sides of the valve body 4.
• a leakage passage 8 extends from one of the spaces in which this pressure prevails, i.e. the pressure p , to the outlet at which pressure P3 prevails, e.g. between the peripheral surface of the piston 5 and the opposing cylinder wall of the chamber 6.
• acts downward ⁇ ly on the closed valve body 4, and the pressure P2 acts with an equal force in both an upward and a downward direc ⁇ tion.
• the constant outlet pressure P3 acts downwardly on an annular surface 9 on the piston 5, whereas the variable pressure P2 acts upwards on the undersurface of the piston 5, this undersurface having an area A2• If it is assumed that the pressure P3 is equal to the pressure 0.1 x p-j, it can readily be shown that when the ratio between the areas h- and 2 lies between 0.5 and 0.7, the pressure P2 will be sufficiently high to close the valve when air is present in the constriction A.
• valve illustrated in Figure 2 is unsuitable both with regard to its manufacture and to its method of operation.
• a more practicable and more suitable valve arrangement is illustrated in Figures 3-5.
• the valve housing of this valve arrangement comprises an upper part 30 and a lower part 31.
• pre ⁇ vails is designated 32 and the first constriction is de ⁇ fined by two axial bores 33.
• the other constriction is de ⁇ fined by three axial bores 34 which are finer than the bores 33.
• the mouths or outlet orifices of the two con ⁇ strictions are thus adjacent one another, instead of being located one behind the other as in the valve arrangement described with reference to Figure 2.
• valve body to have the form of a planar valve plate or disc 35 located in an intermediate chamber 36 in which the pres ⁇ sure P2 prevails.
• the outlet orifices of respective bores 5 33, 34 present a thin, forwardly projecting edge 37, 38 -which when ground flat will ensure that an effective seal is obtained between the mouths of the bores 33, 34 and the upper surface of the valve plate 35.
• the pressure equalizing chan- 0 nel 7 of the Figure 2 embodiment has the form of a clearan ⁇ ce 7' around the periphery of the valve plate 35.
• a plura ⁇ lity of low shoulders 39 provided on the undersurface of the plate 35 ensure that there is obtained beneath the plate 35 a clearance in which the pressure 2 can propa- 5 gate.
• the leakage passage 8 referred to in the description of the Figure 2 embodiment has correspondence in the Figure 3 embodiment in the form of a fine groove or like recess 40 in the forwardly projecting edge 38 of the exit orifices or 0 mouths of the bdres 34.
• valve plate 35 When the valve plate 35 occupies its closed position, the plate is subjected to the downwardly acting force of the pressure p-
• the pressure p decreases slightly as a result of ⁇ -* * the leakage that takes place through the grooves 40 or be ⁇ cause of the presence of oil in the bores 33, the upwardly * acting force is not sufficient to hold the valve plate 35 5 in its closed position and hence the valve will open.
• the pressure p 2 in the chamber 36 will rise, therewith initiating the aforedescribed sequence. If, for example, the total area of the bores 33 is assumed to be equal to the total area of the bores 34 and p- j and P3 are assumed to be equal to 8 bars and 1 bar re ⁇ spectively, P2 will alternate between a value of 4.5 bars when oil is present in the bores 33 and a value of 6.45 bars when air is present in said bores.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Safety Valves (AREA)
• Lift Valve (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20362429

Family Applications (1)

Country Status (5)

Citations (1)

Family Cites Families (4)

• 1985
  • 1985-12-11 SE SE8505865A patent/SE451274B/sv unknown
• 1986
  • 1986-12-10 JP JP50003386A patent/JPS63502128A/ja active Pending
  • 1986-12-10 WO PCT/SE1986/000562 patent/WO1987003664A1/en active IP Right Grant
  • 1986-12-10 DE DE8787900316T patent/DE3669193D1/de not_active Expired - Fee Related
  • 1986-12-10 EP EP87900316A patent/EP0250536B1/en not_active Expired - Lifetime

Patent Citations (1)

Non-Patent Citations (1)

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