JP3811146B2 - Dispensing head for liquid containers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a liquid which is attached to the opening of a liquid container such as beer and other beverages, and uses the gas pressure from a connected gas cylinder so that the liquid in the container can be fed to the outside through a siphon tube. The present invention relates to a container dispensing head.
[0002]
[Prior art]
In this type of liquid container dispensing head, if the dispensing head is removed from the container while the gas pressure remains in the container, the dispensing head is rotated by a large force against the gas pressure. This requires a large operating force and increases the wear of the container, the dispense head, or the packing.
[0003]
In order to solve such a problem, in a conventional dispensing head for a liquid container, when the handle is lowered, the handle is raised to a slide provided with a valve body of an on-off valve that introduces gas pressure from the gas cylinder into the container. In some cases, a valve body of a release valve that allows the gas pressure in the container to escape to the outside when the on-off valve is closed is provided integrally (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
JP-T 8-505113 Publication (FIGS. 1 and 2)
[0005]
[Problems to be solved by the invention]
However, in the conventional device as described above, since the valve body of the release valve is provided integrally with the slide provided with the valve body of the on-off valve, the length of the slide must be increased. Along with this, the head body must be lengthened, and a long port for the release valve must be drilled in the head body, which is cumbersome to process and thoroughly cleans the inside of the port during cleaning. It is hard to do.
In addition, a release valve may not be required, and in that case, a device with a release valve and a device without a release valve must be designed and manufactured completely separately.
[0006]
In view of the above-described problems of the prior art, the present invention can reduce the size of the entire apparatus, can be easily manufactured, can be easily cleaned to the inside, and is a release valve. It is an object of the present invention to provide a dispensing head for a liquid container that can be used in common with other components that do not provide the liquid and that can be safely removed from the container with light power. It is said.
[0007]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
[0008]
(1) A main valve body provided in the head body by mounting the head body in an airtight manner in an opening of a pressure vessel containing liquid and moving a handle mounted on the head body from a closed position to an open position. The pressure gas introduced from the gas port provided in the head main body is introduced into the pressure vessel, and the liquid in the pressure vessel whose liquid surface is pressed by the introduced gas pressure is introduced into the head main body. In a liquid container dispensing head that is sent to the outside through a siphon tube provided inside, the main valve is moved to the lower outer periphery of the head body when the main valve body is lifted by the movement of the handle from the open position to the closed position. in contact with the enlarged diameter flange portion provided in the body, only set a release valve which is adapted to release the pressure gas in the pressure vessel to the outside air, a lid member provided at an end portion of the release valve A boss part with an external thread engraved on the outer periphery is provided at the center of the outer surface, a through hole is provided at the center of the boss part, and an inverted conical valve seat communicating with the through hole is formed on the end face of the boss part. An end wall of an inverted bottomed cylindrical case having a spherical valve body fitted to the valve seat and having an internal screw threaded to the valve body and a male thread of the boss portion on the inner surface of the opening When the gas pressure in the pressure vessel becomes equal to or higher than a set value by the compression coil spring that is compressed between and the valve seat, the pressure gas is against the biasing force of the compression coil spring, pushes up the valve body, through the said case, the exhaust port is formed in the outer peripheral surface of the case, to emit to the outside.
[0009]
(2) In the above item (1), the release valve is detachably provided on the lower outer peripheral portion of the head body.
[0010]
(3) In the above item (1) or (2), the release valve can be moved to the open position and the closed position in the valve box, which is mounted on the outer periphery of the lower part of the head body in an airtight manner. A valve body that is provided and moves to an open position to communicate an inner port that communicates with the internal space of the head body and an exhaust port that communicates with outside air, and through the head body from the valve body, The valve shaft is designed to push the valve body to the open position by being pushed in the axial direction with the tip abutting against the enlarged diameter flange of the main valve body, and the valve body is closed. And an urging means for urging toward the.
[0011]
(4) In the above item (3), the biasing means includes a compression coil spring that is contracted between the end wall of the valve box and the valve body and biases the valve body toward the normally closed position. And
[0012]
(5) In the above (3) or (4), the biasing means uses the valve box as a cylinder and the valve body as a piston, and introduces the gas pressure in the head body to both side surfaces of the piston, By making the one that urges the valve body toward the closed position out of the pressure receiving area on both sides of the piston larger than the other, the difference in urging force due to the gas pressure acting on both sides of the piston is utilized. And means for urging the valve body toward the closed position.
[0013]
In any one of (6) above (3) to (5) section, an exhaust port, through the head body from the valve box, Ru provided so as to open outside the opening of the liquid container at the lower end of the head body.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
1 to 7 show an embodiment of the present invention. 1 to 6 show a state before the safety valve (50) is assembled into the release valve (26) , and FIG. 7 shows a state after the assembly.
As shown in FIG. 1, FIG. 2 and FIG. 5, (1) is a barrel-shaped pressure vessel containing a liquid (2) such as beer and is outside the circular opening (3) provided at the center of the upper end thereof. On the peripheral edge portion, there are formed outward flange portions (4) provided with notches (4a) at a plurality of circumferential locations (three locations in the illustrated example).
[0015]
A head main body (6) of the dispensing head (5) is detachably attached to the upper end of the pressure vessel (1).
That is, the base portion (6a), which is the lower end portion of the head body (6), has a substantially hollow conical shape with an open lower end. ) Can be inserted vertically (in the example shown, three in the illustrated example) is formed with an inward flange portion (7) provided with a notch (7a) in the circumferential direction. The flange (7) is located below the outward flange (4) in the pressure vessel (1), and the upper end of the pressure vessel (1) is from the inward flange (7) in the head body (6). The head main body (6) is fitted to the upper part of the pressure vessel (1) until it is pressed against the annular packing (8) provided slightly above, and then the head main body (6) is attached to the pressure vessel (1). By rotating approximately 60 ° around the central axis, the inward flange (7) engages with the lower surface of the outward flange (4) of the pressure vessel (1) and the upper end of the pressure vessel (1) In a state of press-contacting the packing (8), the head body (6) is mounted in hermetically to the top of the pressure vessel (1).
[0016]
From this state, the head main body (6) can be easily removed from the upper part of the pressure vessel (1) by the reverse procedure described above.
[0017]
Above the base portion (6a) of the head body (6), an upward tube portion (6b) and a horizontal tube with a gas cylinder (not shown) branched off from the lower portion thereof and connected to the free end portion. The part (6c) is continuously provided.
[0018]
Inside the upward cylinder (6b) and the base (6a), a substantially cylindrical main valve element (9) is slid in the vertical direction while maintaining airtightness by a pair of upper and lower O-rings (10, 10). It is movably fitted.
[0019]
An annular groove (11) is formed in the lower outer peripheral surface of the main valve body (9), and as shown in FIG. 1, the main valve body (9) is located at the valve open position which is the lowered position. At this time, the annular groove (11) communicates the gas port (12) provided in the horizontal tube portion (6c) with the internal space of the base portion (6a) and eventually the internal space of the pressure vessel (1). When the pressure gas supplied to the gas port (12) is introduced into the pressure vessel (1) and the main valve element (9) is located at the closed position as shown in FIG. The annular groove (11) is aligned with the gas port (12), and is sealed by the upper and lower O-rings (10) and (10) at the upper and lower portions thereof, from the gas port (12) to the internal space of the base (6a). The supply of pressure gas is cut off.
[0020]
An enlarged diameter flange portion (9a) and a cylindrical portion (9b) are formed at the lower end portion of the main valve body (9), and the lower end of the cylindrical portion (9b) is at the bottom portion of the pressure vessel (1). The siphon tube (13) facing downward reaching is coupled by the coupling member (14).
[0021]
The other end of a flexible tube (not shown) having one end connected to a liquid supply cock (not shown) or the like is connected to the upper end of the main valve body (9).
[0022]
In the main valve element (9), a pin-shaped check valve element (15) facing upward and downward with pointed tapered portions (15a) and (15b) formed at the upper and lower ends is floated in a floating state. A valve seat (16) having a tapered hole that is fitted and expands upward toward the upper surface provided at the lower inner surface of the main valve body (9). The liquid is prevented from flowing backward from the flexible tube side to the pressure vessel (1) side. That is, the check valve is formed by the check valve body (15) and the valve seat (16). A rubber cap (17) for retaining the check valve body (15) is fitted to the upper end portion of the main valve body (9).
[0023]
As shown in FIG. 6, a planing surface (18) is formed on both side surfaces of the intermediate part (or upper part) of the main valve body (9), and a handle arm (19) is formed on the planing surface (18). ) Are fitted with circular short projections (20) and (20) projecting from the intermediate portion of the inner surface of the bifurcated portion (19a).
[0024]
The handle arm (19) is provided with a bifurcated portion (19a) at one end of the handle support shaft (19b), and the main valve body (9) is sandwiched from both sides at an intermediate portion of the bifurcated portion (19a). The tip of (19a) is pivotally attached to the upper part of the horizontal tube (6c) of the head body (6) with a horizontal shaft (21), thereby forming a substantially horizontal position as shown in FIG. As shown in FIG. 2, the valve body (9) is rotated to the valve-opening position, and as shown in FIG. 2, the valve body (9) is turned obliquely upward and the main valve body (9) is held in the valve-closed position. It has become possible.
[0025]
A handle (22) is mounted on the handle support shaft (19b) of the handle arm (19) so as to be slightly tiltable in the vertical direction, and the handle (22) is rotated slightly upward with respect to the handle support shaft (19b). When it is moved, the lock pin (23) protruding from the handle support shaft (19b) into the bifurcated portion (19a) is immersed in the handle support shaft (19b), and when the hand is released from the handle (22), the handle The handle (22) is returned to its original position by the urging force of a spring (not shown) provided in (22), and the lock pin (23) projects into the bifurcated portion (19a). Yes. In addition, since the specific structure in the handle | steering wheel (22) for that is not directly related to this invention, illustration and detailed description are abbreviate | omitted.
[0026]
An upward projecting piece (24) that enters the space between the bifurcated portion (19a) of the handle arm (19) and the main valve body (9) is formed at the upper end of the upward cylindrical portion (6b) of the head body (6). The outer surface is provided with an inclined surface (24a), a cylindrical surface (24b), and a recessed step (24c) from the upper end in order.
[0027]
When the handle arm (19) rotates from the valve closing position shown in FIG. 2 to the valve opening position shown in FIG. 1, the tip of the lock pin (23) is moved from the outer downward inclined surface (24a) to the cylindrical surface (24b ) And finally engages with the recessed step (24c), and the handle arm (19) is locked in the valve opening position.
[0028]
In order to turn the handle arm (19) from the valve opening position to the valve closing position, first, as described above, the handle (22) is turned slightly upward with respect to the handle support shaft (19b), and the lock pin ( After the tip of 23) is detached from the recessed step (24c), the handle (22) may be rotated upward as it is.
[0029]
According to the present invention, in such a dispensing head (5), as shown in FIGS. 3 and 4, the screw hole (25) is provided on the inclined surface in the outer peripheral portion of the base (6a) of the head body (6). When the main valve body (9) is lifted by the movement of the handle (22) from the open position to the closed position, the screw hole (25) comes into contact with the enlarged diameter flange (9a) of the main valve body (9). A release valve (26) adapted to open the pressure gas in the pressure vessel (1) to the outside air is detachably screwed.
[0030]
The release valve (26) has a male screw part (27a) screwed into the screw hole (25), and has a step part serving as a valve seat (28) inside, and a head body (6) by an O-ring (29). ) And a substantially cylindrical case body (27) so as to be kept airtight, a lid member (30) removably screwed to the free end of the case body (27), and a case body ( 27) is substantially slidable in the direction of its central axis, and is movable to an open position that is an ascending position and a closed position that descends and contacts the valve seat (28) ( 31) and the valve body (31) extending in the axial direction, passing through the opening (27b) of the case body (27) and penetrating through the head body (6) and entering the head body (6). The valve shaft (32) whose tip can be positioned in the rising locus of the enlarged diameter flange (9a) of the main valve body (9) and the valve body (31) are urged toward the closed position; Biasing means to be described later.
[0031]
The case body (27) and the lid member (30) form a valve box, and this valve box is formed by a gap between the opening (27b) of the case body (27) and the valve shaft (32), An inner port (33) communicating between the valve seat (28) and the internal space of the head body (6), and the case body (27) are drilled in parallel to the central axis thereof, and the internal space of the case body (27) is formed. And an exhaust port (34) communicating with the valve seat (28).
[0032]
The exhaust port (34) is further passed through an exhaust port (35) facing the up and down direction formed in the head body (6) so that the lower end opens outside the opening (3) of the pressure vessel (1). And communicate with the outside air.
[0033]
A large-diameter hole (38) in which an O-ring (36) having a large outer diameter and a small O-ring (37) are externally fitted on the upper and lower parts of the valve body (31) and formed in the lid member (30). And by sliding along the small diameter holes (39) formed in the case body (27), the upper and lower parts of the valve body (31) and the inner surface of the valve box are kept airtight.
[0034]
The upper end of the small diameter hole (39) is provided with a taper hole (40) that expands upward, and when the valve body (31) reaches the open position, the lower O-ring (37) tapers. Located in the hole (40), the pressure gas in the pressure vessel (1) passes from the inner port (33) through the gap between the tapered hole (40) and the O-ring (37), and then the exhaust port. (34) It is discharged to the outside through (35).
[0035]
In the center of the valve body (31) and the valve shaft (32), there is provided a through hole (41) for guiding the pressure gas in the base (6a) of the head body (6) to the upper part of the large diameter hole (38). It has been.
[0036]
Therefore, the same pressure as the gas pressure in the pressure vessel (1) acts on the upper end and the lower end of the valve body (31), and the valve body (31) is a piston having a valve box as a cylinder.
The pressure receiving area on the upper end side of the valve element (31) acting as the piston is substantially the area of a circle whose diameter is the outer diameter of the O-ring (36), and the pressure receiving area on the lower end side of the valve element (31). The area is substantially the area of a circle whose diameter is the outer diameter of the O-ring (37). Due to the difference in pressure receiving area, the valve body (31) as a piston is at atmospheric pressure in the pressure vessel (1). As long as a larger gas pressure is applied, the first urging means for urging the valve body (31) toward the closing direction by such a cylinder-piston structure is normally urged toward the closing direction. Is formed.
[0037]
Further, the valve body (31) is closed by a compression coil spring (42) that is compressed between the lower surface of the lid member (30) in the large-diameter hole (38) and the upper end of the valve body (31). A second urging means for urging toward is formed.
The compression coil spring (42) as the second urging means is for when the first urging means does not operate, that is, when the gas pressure in the pressure vessel (1) is lowered. It may be a weak one with a thin diameter.
[0038]
Next, the operation of this apparatus will be described.
As shown in FIGS. 1 and 3, when the handle (22) and the handle arm (19) are in the open position, the main valve (9) is held in the lowered open position, and the pressure gas in the gas cylinder is From the gas port (12), the annular groove (11) of the main valve (9), the internal space of the base (6a) of the head body (6), the enlarged diameter flange (9a) of the main valve (9) and the packing (8 ) And the opening (3) of the pressure vessel (1), and is introduced into the pressure vessel (1), and the liquid level of the liquid (2) is pressed by the pressure, and the liquid (2 ) Is sent from the siphon tube (13) through the inside of the valve body (9) to the liquid supply cock by a flexible tube, and is injected from the cock by opening the cock.
[0039]
At this time, in the release valve (26), the valve shaft (32) is separated from the enlarged diameter flange (9a) of the main valve body (9), and is larger than the through hole (41) in the larger diameter hole (38). The valve body (31) is maintained in the closed position by the gas pressure introduced to the pressure coil spring and the compression coil spring (42), and the pressure gas does not leak from the exhaust ports (34) (35). .
[0040]
From this state, when the handle (22) and the handle arm (19) are turned upward to the valve closing position shown in FIGS. 2 and 4, the main valve (9) is moved to the protrusion (20 of the handle arm (19)). ) (20), the enlarged diameter flange (9a) comes into contact with the valve shaft (32) immediately before or after the main valve (9) reaches the valve closing position or during the surplus stroke after reaching the valve closing position. After the valve shaft (32) and the valve body (31) are pushed up and the main valve (9) is closed, the release valve (26) is opened.
[0041]
That is, when the valve body (31) is separated from the valve seat (28), the pressure gas in the pressure vessel (1) flows from the inner port (33) to the small diameter hole (39), the taper hole (40), the case It passes through the gap between the main body (27) and the lid member (30) and the exhaust ports (34) and (35) in sequence, and is discharged from the lower end of the exhaust port (35) to the outside, and inside the pressure vessel (1). Is depressurized to atmospheric pressure.
[0042]
Therefore, in this state, since the internal pressure is not applied in the pressure vessel (1), the dispensing head (5) can be detached from the pressure vessel (1) with a light force.
[0043]
FIG. 7 shows a state after the safety valve (50) is incorporated in the release valve (26) in the above configuration .
[0044]
In this configuration , when the gas pressure inside the base portion (6a) of the head body (6) becomes a predetermined value, for example, 0.5 MPa or more, the gas pressure is released to the release valve (26). Incorporates a safety valve (50).
[0045]
That is, a boss portion (52) having a male screw (51) engraved on the outer periphery is provided in the center of the outer surface of the lid member (30) in the release valve (26), and a through hole (53 ) And an inverted conical valve seat (54) communicating with the through hole (53) is formed on the end face of the boss portion (52), and the valve body (55 ) Of the inverted bottomed cylindrical case (57) having an inner surface of the opening (56) and a female screw (56) screwed to the male screw (51) of the boss portion (52). The compression coil spring (58) contracted between the end wall (57a) urges the valve body (55) toward the valve seat (54), and the gas pressure in the base (6a) is set to the set value. When this is the case, the pressure gas pushes up the valve body (55) from the through hole (53) against the urging force of the compression coil spring (58), passes through the case (57), and the outer periphery of the case (57). The exhaust port (59) formed in the surface is discharged to the outside.
[0046]
With such a configuration, the safety valve (50) can be integrated into the release valve (26), so that the assembling work to the head body (6) can be facilitated and the space can be saved.
[0047]
【The invention's effect】
According to the present invention, the following effects can be achieved.
(1) According to the first aspect of the present invention, the release valve is provided on the lower outer peripheral portion of the head body, and the expansion valve provided on the main valve body is raised when the main valve body is raised by the movement of the handle from the open position to the closed position. Since the pressure gas in the pressure vessel is released to the outside air in contact with the diameter flange portion, the main valve body corresponding to the slide in the above-mentioned Patent Document 1 can be shortened, and accordingly, the head The main body and the entire apparatus can be remarkably miniaturized compared to the conventional one, and particularly the length in the vertical direction can be shortened.
[0048]
In addition, the present invention can be easily applied to existing liquid container dispensing heads simply by attaching the release valve to the lower outer peripheral portion of the head body, and with or without a release valve. The components other than the release valve can be shared.
[0049]
Further, unlike the above-described conventional one, it is not necessary to make a long port in the head body, the processing is easy, and the inside can be easily cleaned completely during cleaning.
[0050]
In addition, when removing the dispensing head from the container, it is possible to perform the detachment work after releasing the gas pressure in the container to the outside.
[0051]
Further, since the safety valve is incorporated in the release valve, the assembling work can be simplified and the space can be saved as compared with the case where they are provided separately.
[0052]
(2) According to the invention described in claim 2, the release valve can be removed from the lower outer peripheral portion of the head body, and can be easily inspected, cleaned, replaced, etc. By closing with the closing means, it can be used as a dispense head without a release valve.
[0053]
(3) According to the invention described in claim 3, the configuration of the release valve can be simplified and easily manufactured.
[0054]
(4) According to the invention described in claim 4, the structure of the urging means can be simplified and the release valve can be operated reliably.
[0055]
(5) According to the invention described in claim 5, the biasing means is formed by utilizing the difference in biasing force due to the gas pressure acting on both side surfaces of the piston without relying on mechanical means such as a compression coil spring. Therefore, the structure can be further simplified and can be manufactured at low cost.
In addition, when used together with the compression coil spring, the reliability of the operation can be improved, and an inexpensive compression coil spring with a small urging force can be used.
[0056]
(6) According to the invention described in claim 6, when the pressure gas in the container is discharged to the outside, it is ejected downward from the outside of the opening of the liquid container at the lower end of the head body. without impinging on the worker, Ru safety der.
[Brief description of the drawings]
[1] An embodiment of the present invention is mounted to the pressure vessel, and is a vertical sectional front view of a main part when the open state.
FIG. 2 is a similar longitudinal front view when the valve is closed.
FIG. 3 is an enlarged longitudinal sectional side view of only the dispensing head as viewed from line III-III in FIG. 1;
4 is an enlarged vertical side view of only the dispensing head as seen from line IV-IV in FIG. 2. FIG.
FIG. 5 is an enlarged cross-sectional view taken along line VV in FIG.
6 is an enlarged cross-sectional view taken along line VI-VI in FIG. 1. FIG.
FIG. 7 is an enlarged longitudinal sectional view of a main part showing a state in which a safety valve is incorporated in a release valve .
[Explanation of symbols]
(1) Pressure vessel
(2) Liquid
(3) Opening
(4) Outward buttock
(4a) Notch
(5) Dispensing head
(6) Head body
(6a) Base
(6b) Upward tube
(6c) Horizontal tube
(7) Inward buttock
(7a) Notch
(8) Packing
(9) Main disc
(9a) Expanded collar
(9b) Tube section
(10) O-ring
(11) Annular groove
(12) Gas port
(13) Siphon tube
(14) Connecting member
(15) Check valve
(15a) (15b) Taper
(16) Valve seat
(17) Rubber cap
(18) Planed surface
(19) Handle arm
(19a) Fork
(19b) Handle support shaft
(20) Projection
(21) Axis
(22) Handle
(23) Lock pin
(24) Upward protrusion
(24a) Outwardly inclined surface
(24b) Cylindrical surface
(24C) Recessed step
(25) Screw hole
(26) Release valve
(27) Case body (valve box)
(27a) Male thread
(27b) Opening
(28) Valve seat
(29) O-ring
(30) Lid member (valve box)
(31) Disc
(32) Valve stem
(33) Inner port
(34) (35) Exhaust port
(36) (37) O-ring
(38) Large diameter hole
(39) Small diameter hole
(40) Taper hole
(41) Through hole
(42) Compression coil spring (biasing means)
(50) Safety valve
(51) Male thread
(52) Boss
(53) Through hole
(54) Valve seat
(55) Disc
(56) Female thread
(57) Case
(57a) End wall
(58) Compression coil spring
(59) Exhaust port

Claims (6)

The head body is attached to the opening of the pressure vessel containing the liquid in an airtight manner, and the main valve body provided in the head body is lowered by moving the handle attached to the head body from the closed position to the open position. The pressure gas introduced from the gas port provided in the head body is introduced into the pressure vessel, and the liquid in the pressure vessel whose liquid surface is pressed by the introduced gas pressure is provided in the head body. In the dispensing head for a liquid container that is sent to the outside through the siphon tube,
When the main valve body ascends due to the movement of the handle from the open position to the closed position on the lower outer periphery of the head body, the pressure gas in the pressure vessel is released to the outside air by contacting the enlarged diameter flange provided on the main valve body. set the release valve so as to open only to the outer surface center of the lid member provided at an end portion of the release valve is provided with a boss portion which is engraved a male screw on the outer periphery, the center of the boss portion, provided with a through hole In addition, an inverted conical valve seat communicating with the through hole is formed on the end face of the boss portion, and a spherical valve body is fitted to the valve seat, the valve body and the boss portion The valve body is urged toward the valve seat by a compression coil spring that is contracted between an end wall of an inverted bottomed cylindrical case having a female screw threadedly engaged with the male screw of the opening, When the gas pressure in the pressure vessel is equal to or higher than a set value, the pressure gas is from the through hole, Serial against the urging force of the compression coil spring, pushes up the valve body, through the said case, the exhaust port is formed in the outer peripheral surface of the case, the liquid container is characterized in that so as to emit to the outside Dispensing head.   The dispensing head for a liquid container according to claim 1, wherein a release valve is detachably provided on a lower outer peripheral portion of the head body.   A release valve is installed in the lower outer periphery of the head body so as to be airtight, and is provided in the valve box so as to be movable between an open position and a closed position. A valve body that communicates the inner port that communicates with the internal space and an exhaust port that communicates with the outside air, and the head body penetrates the head body from the valve body and extends into the head body. And a valve shaft that pushes the valve body to the open position by being pushed in the axial direction, and a biasing means that biases the valve body toward the closed position. The dispensing head for a liquid container according to claim 1 or 2.   4. The liquid container dispenser according to claim 3, wherein the biasing means includes a compression coil spring that is contracted between the end wall of the valve box and the valve body and biases the valve body toward the normally closed position. head.   The urging means uses the valve box as a cylinder and the valve body as a piston, introduces gas pressure in the head body to both side surfaces of the piston, and closes the valve body out of the pressure receiving area on both side surfaces of the piston. Means for urging the valve body toward the closed position by using the difference in the urging force due to the gas pressure acting on both sides of the piston by making the one urging toward the position larger than the other A dispensing head for a liquid container according to claim 3 or 4, further comprising:   The dispensing head for a liquid container according to any one of claims 3 to 5, wherein the exhaust port is provided so as to open from the valve box to the outside of the opening of the liquid container at the lower end of the head body.

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