JPH068379Y2 - Pressure reducing valve with relief valve - Google Patents

Description

[Detailed Description of the Invention] [Field of Use and Outline of the Invention] The present invention relates to a pressure reducing valve with a relief valve, and more particularly, to an improvement of the structure for taking out discharged water when the relief valve is opened. In a valve structure with a detection diaphragm equipped with a relief valve, the water discharged from the relief valve is the pressure reducing valve body of the pressure reducing valve.
By allowing the water to be discharged downward from the bottom of (4), it is possible to prevent the inconvenience caused by the wetting of the entire pressure reducing valve by the discharged water.

[Prior Art and its Problems] A pressure reducing valve and a relief valve are incorporated in a water supply circuit to a hot water storage water heater. All of these valves are for ensuring the safety of the hot water storage tank of the water heater.The former functions to maintain the secondary pressure at a constant level, and the latter has the secondary side circuit including the hot water storage tank. When the pressure becomes abnormally high, the circuit is opened to maintain the pressure below a certain level.

Conventionally, these valve devices were separately arranged in the piping, but recently, by incorporating a relief valve into the pressure reducing valve,
The piping structure is simplified. A pressure reducing valve with such a relief valve is disclosed in Japanese Patent Laid-Open No. 62-177378. In this type, as shown in FIG. 5, a pressure reducing valve main body has a valve chamber (10) on the primary side. , The valve unit (V) consisting of the main valve (1) and the valve shaft (13) is penetrated, and the valve unit (V) and the diaphragm (2) are contacted so that they can come into contact with and separate from each other, and the diaphragm (2 ) Is equipped with a relief valve (3). That is, the valve shaft (31) of the relief valve (3) is a hollow cylinder, and the relief valve (3) and the valve seat portion (11) formed at the upper end of the valve shaft (13) of the valve unit (V) are provided. The spring (21) for setting the secondary pressure of the pressure reducing valve acts on the diaphragm (2), and the spring (2) is attached to the lower end of the main valve (1).
It has a structure in which an auxiliary spring (12) having an urging force smaller than the urging force of 1) acts upward. Therefore, in the normal decompression operation, the relief valve (3) acts on the valve seat (11) because the biasing forces of the spring (21) and the auxiliary spring (12) act in opposite directions.
The main valve (1) is opened / closed by operating according to the operation of the diaphragm (2) while being in contact with. That is, it operates to maintain the secondary pressure at a constant pressure.

When the secondary side is closed, the main valve (1) has the valve chamber (10)
Although it is in a closed state by contacting the valve seat at the lower end of the diaphragm, if the secondary side circuit becomes abnormally high in pressure at this time, an upward force acts on the diaphragm (2) according to this pressure. Although the auxiliary spring (12) is set smaller than the biasing force of the spring (21), the total sum of pressures acting on the diaphragm (2) is large, and this pressure causes the relief valve (3) and the valve seat to move. The relief valve (3) is opened by being separated from the portion (11), and the secondary side circuit is opened through the through hole portion of the valve shaft (31). In other words, the relief valve (3) operates and the secondary side circuit is lowered to the set pressure.

However, in this conventional one, the discharge water from the relief valve (3) is discharged to the diaphragm (2) side of the pressure reducing valve, and the discharge water is accumulated in the upper region of the diaphragm (2), If this state is left for a long time, each part is likely to be damaged due to rust or corrosion.

The present invention has been made in view of the above point, and the "main valve (1) of the valve unit (V) including the main valve (1) and the valve shaft (13) of the main valve (1) The valve shaft (13) is attached to the outlet of the valve chamber (10) on the primary side so that the valve shaft (13) can be separated.
The main valve (1) is linked to the diaphragm (2), which is slidably and airtightly inserted in (10) and is operated according to the secondary pressure of the pressure reducing valve body, by linking the valve unit (V). This is a pressure reducing valve that opens and closes, and the valve unit (V) is biased by an auxiliary spring (12) so that the main valve (1) is in the closing direction, and the biasing force of this auxiliary spring (12) is Said diaphragm (2)
It is set smaller than the urging force of the secondary pressure setting spring (21) applied to the valve unit (V), and the upper end of the valve shaft (13) of the valve unit (V) is located at the part facing the lower surface of the diaphragm (2). The valve seat (11) is provided, and the relief valve (3) provided on the diaphragm (2) is brought into contact with the valve seat (11), and when the relief valve (3) opens, the secondary side In the pressure reducing valve with a relief valve that communicates with the atmosphere side, the discharged water when the relief valve is opened is not stored in the pressure reducing valve and is discharged downward so that the discharged water is It is an object to eliminate the inconvenience caused by storage or adhesion.

[Technical Means] The technical means of the present invention taken in order to solve the above technical problem is that "the valve seat (1) is attached to the valve shaft (13) of the valve unit (V).
A through hole (14) is formed from the formation area of 1) to the lower end of the valve shaft, and the lower end of the valve shaft (13) is hermetically sealed to the bottom wall of the secondary side of the pressure reducing valve body (4). In addition, it is slidably inserted, and a connecting tube portion for connecting a discharge pipe is formed on the outer periphery of the lower end insertion portion of the valve shaft (13) of the pressure reducing valve body (4). "

[Operation] The technical means of the present invention operates as follows.

Regarding the relationship between the main valve (1) and the relief valve (3) of the valve unit (V), the operation of the diaphragm (2), and the operation of each part associated with the pressure change of the secondary side circuit, This is the same as the above-mentioned conventional example.

By the way, when the relief valve (3) is opened, the water in the secondary side circuit that flows into the area of the valve seat (11) formed at the upper end of the valve shaft (13) of the valve unit (V) is It is discharged from the through hole (14) of the valve shaft (13). Since the lower end of the valve shaft (13) is slidably inserted in the outer peripheral airtight state of the bottom wall of the pressure reducing valve body (4) on the secondary side, the discharged water is discharged from the pressure reducing valve body (4). The lower end of the valve shaft (13) exposed on the bottom wall of the secondary side reaches the connecting cylinder and is discharged downward from this. Therefore, when the discharge pipe is connected to the connecting cylinder portion, the discharge water when the relief valve is opened is discharged from the discharge pipe to a desired position.

Since the connection tube portion for connecting the discharge pipe is located on the outer peripheral side away from the lower end insertion portion of the valve shaft (13), the discharge pipe connected to the connection tube portion and the valve shaft (13) are mutually connected. Independently, the main valve (1) operates independently of the discharge pipe.

[Effects] The present invention having the above-described configuration has the following unique effects.

When the relief valve is operated, the discharged water when the relief valve is opened is not stored in the pressure reducing valve but is discharged downward from the bottom wall of the secondary side of the pressure reducing valve body (4) as it is. The inconveniences such as corrosion and rust due to the accumulation or adhesion of the in the pressure reducing valve are reliably eliminated.

Also, when the discharge water is discharged downward, the discharge pipe connected to the connecting cylinder does not affect the operation of the main valve (1), so even if the discharge pipe is connected, the pressure reducing operation of the main valve Will be smooth.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

The first embodiment shown in FIGS. 1 to 3 is similar to the above-described conventional example, in the valve chamber (10) on the primary side of the pressure reducing valve body (4), the main valve (1) and the valve shaft (13). ) Through the valve unit (V)
A valve seat (11) is provided at the upper end of (13), and a relief valve (3) arranged in the center of the diaphragm (2) is in contact with this valve seat (11). The arrangement of the spring (12) and the urging force of the spring (12) and the urging force of the spring (21) acting on the diaphragm (2) are set in the same manner as in the above-mentioned conventional example.

The valve shaft (13) of the valve unit (V) has a hollow cylindrical shape with a through hole (14) penetrating in the axial direction in order to form a communication passage that connects the relief valve (3) and the atmosphere side. Configured. The upper end of the valve shaft (13) is slidably fitted in the outer peripheral airtight state to the upper end cylindrical portion of the cylindrical portion (41) formed in the pressure reducing valve body (4). The inside of the cylindrical portion (41) corresponds to the valve chamber (10) on the primary side of the pressure reducing valve body (4) described above. On the other hand, valve stem (13)
The lower end of the plug penetrates the stopper body (42) mounted on the bottom wall of the pressure reducing valve body (4) on the secondary side in a hermetically sealed state and slidably.

At the upper end of the valve shaft (13) facing the diaphragm (2), there is formed a valve seat (11) that is in contact with the relief valve (3) provided on the diaphragm (2), and The upper end of the hole (14) is a space (S) formed by the relief valve (3) and the valve seat (11).
And the lower open end is opened into the lower cylindrical portion of the plug (42). Therefore, the space (S) communicates with the atmosphere side from the through hole portion (14) through the lower open end of the plug body (42).

Next, in this embodiment, the diaphragm (2) and the valve unit
(V) is connected with a certain range of relative movement allowance.Therefore, the protrusion from the center of the bottom surface of the relief valve (3)
(32) protrude, and pin (P) this protrusion (32) and valve shaft (13).
Are linked by. Further, in order to provide the connecting portion with relative movement allowance in the axial direction, in this embodiment, the protrusion (3
A cross section of a lateral hole (33) penetrating in a direction perpendicular to the axis in (2) is an elongated hole, and the pin (P) is inserted into the lateral hole (33). This pin (P) is installed at the upper end of the valve shaft (13) and penetrates the cylindrical valve seat body (15) having the valve seat portion (11) in a direction perpendicular to its axis. The so-called spring pin is used. Also, the valve shaft (1
As a connection structure between 3) and the valve seat body (15), a screw connection method is adopted, and in order to ensure airtightness of this screw connection portion, the second
As is clear from the figure, a seal packing (16) is provided at the base end of the upper screw portion of the valve shaft (13).

In the case of the pressure reducing valve with the above configuration, the relief valve (3) and the valve seat body are previously
These (15) and (15) are connected with each other using a pin (P), these are screwed to the diaphragm (2), and the assembly and the valve shaft (13) equipped with the main valve (1) are cylindrical. Screw it to the valve seat body (15) in the part (41). At this time, since the valve seat body (15) and the relief valve (3) are connected by the pin (P), while holding a part of the relief valve (3), fix the upper screw part of the valve shaft (13). When the valve seat body (15) is screwed into the female screw portion, the valve seat body (15) and the valve shaft (13) can be screwed together without rotating together. After that, when each part is assembled to the pressure reducing valve main body (4), the pressure reducing valve is completed, and the valve shaft (13) and the relief valve (3) are connected in a mode having a certain movement margin. In this embodiment, in order to facilitate screwing of the valve shaft (13), a tool engaging groove (17) which is diametrically cut is formed at the lower end of the valve shaft (13). Therefore, when the valve seat body (15) and the valve shaft (13) are screwed together, the tool engagement groove (17) is used.
A tool such as a screwdriver can be associated with and the relative rotation can be performed while a part of the relief valve (3) is held by the tool.

In the case of this embodiment, normally, the relief valve (3) is in the closed state and the valve unit (V) is the same as in the above-mentioned conventional example.
Reacts with the diaphragm (2) in response to changes in secondary pressure.

When the relief valve (3) is in the closed state and the secondary pressure exceeds the set pressure of the relief valve (3), the relief valve (3) and the valve unit (V) are connected to each other. However, since there is an axial movement allowance between the two, the diaphragm (2) responds independently of the valve unit (V) according to this movement allowance. That is, the diaphragm (2) operates in the direction of separating from the valve shaft (13) of the valve unit (V) against the biasing force of the spring (21), and the relief valve (3 ) Also moves in a direction away from the valve seat portion (11) of the valve shaft (13),
As shown, the space (S) communicates with the atmosphere side through the through hole portion (14). Then, due to this action, the secondary side relief valve (3)
Will be maintained at the set pressure of.

When a pressure higher than the set pressure acts on the secondary side, the diaphragm (2) will be separated from the upper end of the valve unit (V), but the valve unit (V) and the diaphragm will be separated.
Since the separation distance from (2) is limited within the range of movement of these connecting parts, at this time the diaphragm
(2) and the valve unit (V) are constantly connected, and the relief valve (3) and the valve shaft (13) are in the path of the protrusion (32) pin (P) valve seat body (15). Connected, as shown in FIG.
The forced valve closing force acts on the main valve (1) integrated with (13).

In this embodiment, the lower end of the valve shaft (13) is formed at the lower end of the plug body (42) and the female screw portion (4
Since it is opened to 3), the relief valve is
(3) The pipe for discharging the discharged water during operation can be screwed and connected.

Next, a second embodiment shown in FIG. 4 has a valve shaft (13) and a valve seat (1
5) and the valve shaft (13) are integrated, and the main valve (1), which is configured separately from this valve shaft (13), is screwed and the valve shaft (13)
As a connecting structure of the relief valve (3) and the relief valve (3), the shaft body (18) is formed in such a manner that the through hole portion (14) of the cylindrical valve shaft (13) penetrates through the center portion of the relief valve (3).
Screw the valve head (19) at the lower end of the shaft (18) into the valve shaft (13).
It is arranged to face the lower end of the via a certain gap (G). Also in this case, the same function as that of the first embodiment is performed. In addition, in this embodiment, the cross-sectional shape of the inner periphery of the tubular portion having the valve seat portion (11) is a polygon such as a hexagon,
The main valve (1) can be screwed to the lower end of the valve shaft (13) by associating a tool with the polygonal cross section. Therefore, the main valve (1) is attached to the lower end of the valve shaft (13) with the upper end of the valve shaft (13) inserted in the tubular portion (41) in advance, and after this, the shaft body (18 ) Can be screwed to the relief valve (3).

In the second embodiment, when the pressure on the secondary side exceeds the set pressure of the relief valve (3), the shaft body (18) and head (19)
The forced closing force acts on the main valve (1) in the path of the lower end of the valve shaft (13).

Incidentally, in any of the above-mentioned examples, the connecting cylinder portion for the discharge pipe connecting portion was formed in the separate plug body (42) attached to the pressure reducing valve body (4). It may be formed integrally.

Further, as the connecting cylinder portion, other than the female screw structure,
It is also possible to use a so-called hose end for connecting a flexible tube such as a rubber hose.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIGS. 2 and 3 are explanatory views of an operating state, and FIG. 4 is an explanatory view of essential parts of another embodiment, and FIG.
The figure is an explanatory view of the conventional example. In the figure, (1) ...... Main valve (10) ...... Valve chamber (13) ...... Valve shaft (V) ...... Valve unit (12) ...... Auxiliary spring (21 ) …… Spring (2) …… Diaphragm (11) …… Valve seat (3) …… Relief valve (14) …… Through hole (13) …… Valve shaft (4) …… Reducing valve body

Claims (1)

[Scope of utility model registration request] 1. A main valve (1) of a valve unit (V) consisting of a main valve (1) and a valve shaft (13) of the main valve (1)
The valve shaft is attached to the outlet of (10) so that it can come into contact with and separate from the outlet.
(13) is inserted into the valve chamber (10) in a hermetically slidable manner, and the valve unit (V) is interlocked with a diaphragm (2) that operates according to the secondary pressure of the pressure reducing valve body. Main valve (1)
A pressure reducing valve that opens and closes the valve unit (V) is urged by an auxiliary spring (12) so that the main valve (1) is closed, and the urging force of the auxiliary spring (12) is Is set to be smaller than the biasing force of the secondary pressure setting spring (21) acting on the diaphragm (2), and the valve shaft (13) of the valve unit (V) is set.
A valve seat portion (11) is provided at the upper end of the diaphragm at a portion facing the lower surface of the diaphragm (2), and the relief valve (3) provided on the diaphragm (2) is brought into contact with the valve seat portion (11). In the pressure reducing valve with a relief valve, which is configured to communicate the secondary side to the atmosphere side when the relief valve (3) is opened, the valve seat portion is provided on the valve shaft (13) of the valve unit (V). A through hole (14) is formed from the formation area of (11) to the lower end of the valve shaft, and the lower end of the valve shaft (13) is hermetically sealed to the bottom wall on the secondary side of the pressure reducing valve body (4). The valve shaft (13) in the pressure reducing valve body (4) is slidably inserted in this state.
A pressure reducing valve with a relief valve in which a connecting tube portion for connecting a discharge pipe is formed on the outer periphery of the lower end insertion portion of