JP2008234364A - Pressure reducing valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure reducing valve device capable of surely preventing fine foreign matters passing through a strainer from being caught in. <P>SOLUTION: This pressure reducing value device 10 comprises: a diaphragm mechanism comprising a pressure reducing valve 24; a check valve 56 at the upstream side of the pressure reducing valve 24; and a stopper mechanism 80 for regulating the valve opening of a check valve body 62 by butting a stopper member 82 to the check valve body 62 in the case of opening the check valve body 62. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pressure reducing valve device that maintains a secondary side fluid pressure at a constant set pressure lower than a primary side fluid pressure, and more particularly to a feature of technical means for preventing foreign matter biting.

2. Description of the Related Art Conventionally, pressure reducing valve devices that maintain a secondary side fluid pressure at a constant set pressure lower than a primary side fluid pressure have been widely used for various purposes.
For example, when an electric water heater is installed and hot water heated by the electric water heater is supplied to the faucet device, a pressure reducing valve device is installed upstream of the hot water tank of the electric water heater, and the primary water supply pressure is reduced. The water is supplied to the hot water tank after the pressure is reduced.

FIG. 3 shows an example of a conventional pressure reducing valve device.
In the figure, reference numeral 200 denotes a pressure reducing valve device, and 202 denotes a main body (valve body) in the pressure reducing valve device 200, which is provided with a liquid inlet 204 and an outlet 206.

  A liquid passage 208 is formed inside the main body 202 and communicates with the inflow port 204 and the outflow port 206. A pressure reducing valve 210 performs a pressure reducing action by reducing the flow rate of the liquid in the liquid passage 208.

  Reference numeral 212 denotes a pressure reducing valve body in the pressure reducing valve 210. The pressure reducing valve body 212 has a valve portion 214 and a shaft portion 216, and is moved between the valve portion 214 and the valve seat 218 by moving in the vertical direction in the drawing. By changing the gap (valve opening), the flow rate of the liquid flowing through the liquid passage 208 is reduced, and at that time, pressure loss (pressure loss) is generated, and the secondary side liquid pressure is made lower than the primary side liquid pressure. .

220 is a diaphragm that is displaced upward in the drawing in response to the secondary fluid pressure. A shaft portion 216 of a pressure reducing valve body 212 is connected to the diaphragm 220, and the pressure reducing valve is interlocked with the vertical displacement of the diaphragm 220 in the drawing. The body 212 moves in the vertical direction in the figure.
Here, the urging force of the spring 222 disposed on the upper side of the diaphragm 220 is exerted downward on the diaphragm 220.
The diaphragm 220 is displaced in the vertical direction by the downward urging force of the spring 222 in the drawing and the secondary fluid pressure acting upward in the drawing.

224 is a check valve that allows only the flow of the liquid from the primary side liquid passage 208A to the secondary side liquid passage 208B and blocks the flow in the reverse direction. The check valve has a valve portion 228 and a shaft portion 230. A body 226, a valve seat 232 corresponding to the valve portion 228, and a spring 234 for biasing the check valve body 226 in the valve closing direction.
In the check valve 224, the check valve body 226 is opened by the flow of the liquid from the primary side liquid passage 208A to allow the flow of the liquid to the secondary side liquid passage 208B, and the flow in the reverse direction is prevented. When it is about to occur, the valve portion 228 of the check valve body 226 is seated on the valve seat 232 and closed to prevent the reverse flow.
Reference numeral 236 denotes a strainer composed of a mesh-like member, and this strainer 236 serves to remove foreign substances contained in the liquid by a filtering action.

In the pressure reducing valve device shown in FIG. 3, the diaphragm 220 is displaced in the vertical direction in the drawing in accordance with the magnitude of the secondary side fluid pressure acting on the diaphragm 220, and the pressure reducing valve body 212 is moved up and down in conjunction with the pressure. Thus, the clearance between the valve portion 214 and the valve seat 218 in the pressure reducing valve body 212, that is, the valve opening degree is changed.
That is, when the secondary fluid pressure is low, the diaphragm 220 is displaced downward in the figure based on the urging force of the spring 222, and a gap (valve opening) between the valve portion 214 of the pressure reducing valve body 212 and the valve seat 218 is reached. Is increased, and the amount of restriction of the flow rate of the liquid from the primary liquid passage 208A to the secondary liquid passage 208B is reduced.
That is, the pressure loss when the liquid from the primary side liquid passage 208A passes through the pressure reducing valve 210 toward the secondary side liquid passage 208B is reduced to increase the secondary side liquid pressure.

  Further, when the secondary fluid pressure increases, the diaphragm 220 moves upward in the figure, the opening of the pressure reducing valve body 212 is reduced, and the pressure loss at the pressure reducing valve 210 is increased. Then, the pressure reducing valve body 212 maintains a predetermined valve opening degree under a stable water flow state according to the primary side liquid pressure, and maintains the secondary side liquid pressure at a predetermined fixed pressure.

  In this pressure reducing valve device 200, normally, a gap of about 2 to 3 mm is generated between the valve portion 214 of the pressure reducing valve body 212 and the valve seat 218 in a non-water-flowing state. Under such conditions, the gap may become a very small gap S1 (see FIG. 3B) of about 0.1 to 0.3 mm. In this case, the fineness that has passed through the eyes (openings) of the upstream strainer 236 This causes a problem that foreign matter such as fine sand is caught between the valve portion 214 and the valve seat 218.

The fine foreign matter caught here does not readily flow to the secondary side due to the flow of the liquid in the liquid passage 208, and remains stuck between the valve portion 214 and the valve seat 218.
In this case, even if the primary side fluid pressure increases, the pressure reducing valve body 212 cannot be closed, and the secondary side fluid pressure becomes higher than the set pressure. That is, the secondary side liquid pressure cannot be maintained at the set pressure.

In order to solve this problem, the following Patent Document 1 discloses that a gap in the direction perpendicular to the axis between the shaft portion 216 and the valve seat 218 is set to 0.5 mm or less, and the primary fluid pressure is reduced to reduce the diaphragm. By reducing the pressure that pushes up 220, the gap between the valve portion 214 and the valve seat 218 is increased, and the reduced pressure is designed to prevent such foreign matter from being caught between the valve portion 214 and the valve seat 218. A valve device is disclosed.
However, when the water supply pressure on the primary side is high, the gap between the valve portion 214 of the pressure reducing valve body 212 and the valve seat 218 in the pressure reducing valve device 200 is as small as 0.1 to 0.3 mm as described above. In this case, when a foreign substance finer than the opening size of the strainer 236 or the gap between the shaft portion 216 and the valve seat 218 flows between the valve portion 214 and the valve seat 218, the foreign matter is caught. .

JP 2002-132351 A

  The present invention has been made for the purpose of providing a pressure reducing valve device that can reliably prevent the intrusion of fine foreign matters that pass through a strainer.

  Thus, according to the first aspect of the present invention, there is provided a main body provided with a liquid inlet and outlet, a liquid passage formed inside the main body and connecting the inlet and outlet, and the liquid passage. And a pressure reducing valve that performs a pressure reducing action by reducing the flow rate of the liquid, and the pressure reducing valve body of the pressure reducing valve is configured to reduce the valve opening as the primary liquid pressure increases. In the pressure reducing valve device that moves the valve opening in a direction that increases according to a decrease in the liquid pressure and maintains the secondary side liquid pressure at a constant set pressure lower than the primary side liquid pressure, the pressure reducing valve A check valve that allows only the flow of liquid from the primary side liquid passage to the secondary side liquid passage downstream of the pressure reducing valve and prevents reverse flow in the primary side liquid passage on the upstream side. In addition, when the check valve body is opened, the stopper member is brought into contact with the check valve body so that the valve opening degree of the check valve body is minimized. A stopper mechanism that can be regulated to an opening smaller than the opening is provided, and the check mechanism and the stopper mechanism constitute a throttle mechanism that restricts the flow rate of liquid from the primary liquid passage to the secondary liquid passage. It is characterized by being.

  According to a second aspect of the present invention, in the first aspect, the stopper mechanism has an adjustment mechanism that adjusts a throttle amount of the liquid by adjusting a contact position of the stopper member with respect to the check valve body. It is characterized by.

  According to a third aspect of the present invention, in any one of the first and second aspects, the check valve is provided in the primary liquid passage inside the main body, and the stopper mechanism is provided in the main body. It is characterized by.

Effects and effects of the invention

  As described above, the present invention provides a check valve in the primary liquid passage upstream from the pressure reducing valve and makes the stopper member abut against the check valve body during the opening operation of the check valve body. A stopper mechanism capable of restricting the valve opening degree of the stop valve body to an opening degree smaller than the maximum opening degree is provided, and a throttle mechanism that restricts the flow rate of the liquid is configured by the check valve and the stopper mechanism.

Such a pressure reducing valve device according to the present invention includes a check valve and a stopper mechanism in addition to causing pressure loss by the pressure reducing valve with respect to the flow of liquid from the primary side liquid passage to the secondary side liquid passage. A pressure loss can also be generated by the throttle mechanism, and the secondary side liquid pressure can be maintained at a constant set pressure lower than the primary side liquid pressure based on the pressure loss at these two locations.
In this case, the pressure loss to be generated by the pressure reducing valve can be reduced, and the valve opening degree of the pressure reducing valve body can be increased as compared with the case where there is no such throttle mechanism.
As a result, it is possible to effectively prevent foreign matter such as fine sand that passes through the strainer's eyes (openings) from being caught between the valve portion and the valve seat in the pressure reducing valve body. .

  Further, in the present invention, since the throttle mechanism is configured using the check valve normally provided on the primary side of the pressure reducing valve as it is, only a slight structural change is required compared to the case where a separate throttle mechanism is provided. Compared to the case where a new and separate diaphragm mechanism is provided, the required cost can be reduced.

According to a second aspect of the present invention, the stopper mechanism is provided with an adjusting mechanism that adjusts the amount of liquid throttling by adjusting the contact position of the stopper member with respect to the check valve body.
For example, in a valve pressure valve device provided on the upstream side of a hot water tank in an electric water heater, the supply water pressure on the primary side varies depending on the installation site.
In this case, if the contact position of the stopper member with respect to the check valve body is fixed at a fixed position, the valve opening of the pressure reducing valve body becomes small when the primary side water supply pressure is high, and conversely the primary When the water supply pressure on the side is low, the valve opening of the pressure reducing valve body becomes large and becomes unstable, and when the water supply pressure on the primary side is high, the valve opening of the pressure reducing valve becomes small, thereby reducing the pressure reducing valve body. There is a risk that foreign matter such as dust may be caught in the gap between the valve portion and the valve seat.
However, according to the second aspect, when the primary side hydraulic pressure is high, the lift-up amount (valve opening degree) of the check valve body can be adjusted to be small by changing the stopper position by the stopper member. By increasing the pressure loss when passing through the stop valve body, the valve opening degree of the pressure reducing valve body can be ensured to be large, and even when the primary side fluid pressure is high, the foreign matter is reliably caught by the pressure reducing valve body. It becomes possible to prevent.

In the present invention, the check valve can be provided in the primary liquid passage inside the main body and the stopper mechanism can be provided in the main body.
If it does in this way, a pressure-reduction valve apparatus can be comprised as a single structure.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, reference numeral 10 denotes a pressure reducing valve device according to this embodiment, and reference numeral 12 denotes a main body (valve body) in the pressure reducing valve device 10.
The main body 12 is integrally formed of a metal casting, and connection ports 13 and 14 for piping are provided at the left end and the right end in the drawing.
The insides of these connection ports 13 and 14 are a liquid inlet 16 and an outlet 18, respectively.

A partition wall 20 is provided in the main body 12, and a liquid passage 22 that communicates the inlet 16 and the outlet 18 is defined in the main body 12 by the partition 20.
Reference numerals 22A and 22B denote a primary liquid passage on the upstream side and a secondary liquid passage on the downstream side with respect to the pressure reducing valve 24, respectively.

The pressure reducing valve 24 serves to maintain the secondary side liquid pressure at a constant set pressure smaller than the primary side liquid pressure, and 26 is a pressure reducing valve body in the pressure reducing valve 24.
The pressure reducing valve body 26 has a valve portion 28 and a shaft portion 30, and changes the gap (valve opening) between the valve portion 28 and the valve seat 32 by moving in the vertical direction in the figure, The flow rate of the liquid flowing through the liquid passage 22 is reduced, and at that time, a pressure loss (pressure loss) is generated to make the secondary side liquid pressure lower than the primary side liquid pressure.
Incidentally, the valve seat 32 is provided in a shape projecting annularly downward in the figure around the valve opening.
The shaft portion 30 is provided with a piston portion 34. The piston portion 34 is fitted in a fitting hole 36 provided in the partition wall 20 in a watertight and vertically slidable manner through an O-ring. Yes.

38 is a diaphragm that is displaced upward in the drawing in response to the secondary side hydraulic pressure. The upper end portion of the shaft portion 30 in the drawing with respect to the diaphragm 38 is a flange portion 40 provided on the shaft portion 30 and a shaft. A central portion of the diaphragm 38 is sandwiched by a nut 42 screwed into a threaded portion at the tip of the portion 30.
As a result, the pressure reducing valve body 26 is moved in the vertical direction in conjunction with the vertical displacement of the diaphragm 38 in the drawing.

Reference numeral 44 denotes a cover member that forms a spring accommodating chamber 46 on its inner side. A spring 48 made of a compression coil spring is accommodated in the spring accommodating chamber 46, and the diaphragm 38 is urged downward in the drawing.
Reference numeral 50 denotes a disc-shaped spring adjustment member that also serves as a lid for closing the upper end opening of the cover member 44, and a male screw is formed on the outer peripheral surface, and the male screw is screwed onto the female screw on the inner peripheral surface of the cover member 44. Are combined.
The spring adjusting member 50 is brought into contact with the upper end of the spring 48 via a spring receiver 52, and the spring adjusting member 50 is rotated downward and screwed downward in the figure, so that the spring 48 is attached downward. The power is increased. Conversely, the urging force of the spring 48 is weakly adjusted by screwing the spring adjustment member 50 upward in the drawing.
The spring adjusting member 50 is provided with a tool engaging groove 54 at the center of the upper surface.

In this embodiment, the diaphragm 38 is displaced in the vertical direction by the downward biasing force of the spring 48 in the drawing and the secondary side hydraulic pressure acting upward in the drawing.
In the present embodiment, the pressure reducing valve 24 includes the check valve body 26, the valve seat 32, the diaphragm 38, the spring 48, the spring receiver 52, the spring adjusting member 50, and the like.

  56 is a check valve that allows only the flow of liquid from the primary side liquid passage 22A to the secondary side liquid passage 22B and blocks the flow in the reverse direction, and includes a valve portion 58 and a shaft portion 60. The valve body 62, the valve seat 64 corresponding to the valve portion 58, and the spring 66 for biasing the check valve body 62 in the valve closing direction are provided.

In addition, the valve seat 64 is provided in the shape which protrudes cyclically | annularly upward in the figure toward the valve part 58 of the non-return valve body 62 around a valve opening.
The shaft portion 60 is fitted in a fitting hole 70 of a valve case 68 that holds the check valve body 62 so as to be slidable in the vertical direction.
The valve case 68 is inserted into the main body 12 upward in the figure at an opening 71 formed in the main body 12, and an inner peripheral surface of the opening of the main body 12 is an external thread formed on the outer peripheral surface of the valve case 68. And is attached to the main body 12.
Reference numeral 72 denotes a strainer made of a mesh-like member attached to the valve case 68. The strainer 72 serves to remove foreign substances contained in the liquid by a filtering action.

A push rod 74 for draining water is held in the valve case 68 so as to be pushed upward in the figure.
The push rod 74 forcibly opens the check valve body 62 in a valve-closed state by pushing upward in the drawing to drain water.

The body body 12 is also provided with an opening 76 at a lower position in the figure of the pressure reducing valve body 26, and the opening 76 is closed by a plug 78.
The plug body 78 is screwed into the female screw on the inner peripheral surface of the opening 76 at the male screw on the outer peripheral surface, and closes the opening 76.
The opening 76 is provided for detaching the pressure reducing valve body 26.

  In this embodiment, when the check valve body 62 is opened in the check valve 56, a stopper mechanism 80 is provided that can regulate the valve opening to an opening smaller than the maximum opening. And the check valve 56 constitutes a throttle mechanism that restricts the flow rate of the liquid from the primary liquid passage 22A to the secondary liquid passage 22B.

A stopper member 82 in the stopper mechanism 80 has an axial shape in the vertical direction in the figure, and a contact part 84 having a large-diameter disk shape is provided at the lower end part in the figure. 84 is brought into contact with the upper surface of the check valve body 62 to regulate the valve opening degree of the check valve body 62.
That is, the lift-up amount of the check valve body 62 is regulated.

As shown in the enlarged view of FIG. 2, the stopper member 82 is a fitting shaft portion 85 having a circular base portion, and the fitting shaft portion 85 is formed in a circular opening 86 penetrating the main body 12. It is fitted in a watertight manner through an O-ring 87 as an elastic seal ring.
And the upper end part protrudes upward from the main body 12.

The stopper member 82 has a male screw 90 on the outer peripheral surface of the upper portion, and this male screw 90 is screwed to a female screw 94 on the inner peripheral surface of the cap 92 attached to the circular opening 86, and at the screwed portion. The body body 12 is held by a main body 12 through a cap 92 so as to be rotatable.
The stopper member 82 is moved in the axial direction by screw feeding downward or upward in the figure by engaging a tool in an engagement groove 96 provided on the upper end surface and rotating the tool.

Thus, when the stopper member 82 moves forward in the drawing downward, the contact position with respect to the check valve body 62, that is, the stopper position is adjusted downward, and when the stopper member 82 moves backward, the check valve body 62 is moved downward. The position of the abutment, that is, the stopper position is adjusted to the upper side in the figure.
That is, the lift-up amount of the check valve body 62 can be freely adjusted by moving the stopper member 82 up and down.
In the present embodiment, an adjustment mechanism for moving the position of the stopper member 82 is constituted by the male screw 90 of the stopper member 82 and the female screw 94 of the cap 92.

In the pressure reducing valve device 10 of this embodiment, the diaphragm 38 is displaced in the vertical direction in the figure in accordance with the magnitude of the secondary fluid pressure acting on the diaphragm 38, and the pressure reducing valve body 26 moves up and down in conjunction with the pressure. Thus, the clearance between the valve portion 28 and the valve seat 32 in the pressure reducing valve body 26, that is, the valve opening degree is changed.
That is, when the secondary side hydraulic pressure is low, the diaphragm 38 is displaced downward in the figure based on the urging force of the spring 48, and a gap (valve opening) between the valve portion 28 of the pressure reducing valve body 26 and the valve seat 32. Is increased, and the amount of restriction of the flow rate of the liquid from the primary side liquid passage 22A to the secondary side liquid passage 22B is reduced.
That is, the pressure loss when the liquid from the primary side liquid passage 22A passes through the pressure reducing valve 24 toward the secondary side liquid passage 22B is reduced, and the secondary side liquid pressure is increased.

On the other hand, when the secondary fluid pressure increases, the diaphragm 38 moves upward in the figure, the valve opening degree of the pressure reducing valve body 26 decreases, and the pressure loss at the pressure reducing valve 24 increases.
When the secondary fluid pressure reaches a set constant pressure under the stable water flow state, the pressure reducing valve body 26 maintains a constant valve opening degree and maintains the secondary fluid pressure at a predetermined constant pressure.

Thus, in the conventional pressure reducing valve device, the secondary side liquid pressure is held at a constant set pressure lower than the primary side liquid pressure based only on the pressure loss caused by the pressure reducing valve 24. Then, in addition to the pressure loss due to the pressure reducing valve 24, the pressure loss is also caused by the throttle mechanism including the check valve 56 and the stopper mechanism 80.
Specifically, in the conventional check valve, the check valve body 62 can be freely opened until the maximum opening degree is reached according to the flow pressure of the liquid on the primary side. The valve opening of the check valve body 62 is restricted to a valve opening smaller than the maximum opening degree by the stopper mechanism 80, and the gap between the valve portion 58 and the valve seat 64 in the check valve body 62 is kept small. Is done.
As a result, when the liquid passes through the check valve body 62 from the primary side liquid passage 22A toward the secondary side liquid passage 22B, a predetermined pressure loss is caused there.

In the pressure reducing valve device 10 of this embodiment, the secondary side liquid pressure is changed to the primary side liquid pressure based on the total pressure loss of the pressure loss when passing through the check valve 56 and the pressure loss when passing through the pressure reducing valve 24. Reduced to pressure.
The stopper mechanism 80 moves the stopper member 82 up and down to change the contact position (stopper position) with respect to the check valve body 62, thereby causing the valve portion 58 and the valve seat 64 of the check valve body 62 to change. Can be adjusted to an appropriate clearance according to the magnitude of the primary side fluid pressure, and the pressure loss when passing through the check valve 56 can be increased or decreased.
As a result, as shown in FIG. 1 (B), the pressure reducing valve when the secondary side liquid pressure is maintained at the set pressure regardless of whether the primary side liquid pressure is high or conversely low. A gap between the valve portion 28 and the valve seat 32 in the body 26 can be held in a gap S2 larger than the gap S1 shown in FIG.

  In this embodiment, the flow rate of the liquid flowing through the secondary liquid passage 22B is measured, and the flow rate of the liquid flowing through the secondary liquid passage 22B is 90 to 100% with respect to the flow rate when the check valve 56 is fully opened. By adjusting the valve opening degree of the check valve body 62 so as to be, the gap between the valve portion 28 and the valve seat 32 in the pressure reducing valve 24 can be made a gap that does not bite foreign matter. it can.

According to the present embodiment as described above, in addition to causing pressure loss by the pressure reducing valve 24 with respect to the flow of liquid from the primary side liquid passage 22A to the secondary side liquid passage 22B, the check valve 56 and the stopper mechanism 80 can also cause pressure loss. Based on the pressure loss at these two locations, the secondary fluid pressure is lower than the primary fluid pressure. Can be held in.
In this embodiment, the pressure loss that should be caused by the pressure reducing valve 24 can be reduced, and thereby the valve opening degree of the pressure reducing valve 24 can be increased.
This effectively prevents foreign matter such as fine sand from passing through the eyes (openings) of the strainer 72 between the valve portion 28 of the pressure reducing valve body 26 and the valve seat 32. Can do.

  Further, in this embodiment, since the throttle mechanism is configured by using the check valve 56 that is conventionally provided as it is, only a slight structural change is required compared to the case where a separate throttle mechanism is provided, and it is new and separately provided. The required cost can be reduced compared with the case where the aperture mechanism is provided.

  Furthermore, in the present embodiment, when the primary side fluid pressure is high, the lift-up amount of the check valve body 62 can be reduced by changing the stopper position of the stopper member 82 with respect to the check valve body 62, thereby allowing the liquid to flow. The pressure loss when passing through the check valve 56 can be increased. Therefore, even when the primary fluid pressure is high, the valve opening of the pressure reducing valve body 26 can be kept large, and it is possible to reliably prevent foreign matter from being caught by the valve portion 28 and the valve seat 32 of the pressure reducing valve body 26. it can.

  In addition, since the check valve 56 is provided in the primary liquid passage 22A inside the main body 12 and the stopper mechanism 80 is provided in the main body 12, the pressure reducing valve device 10 can be configured as a single structure.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention may be provided with a primary side liquid passage check valve and a stopper mechanism outside the main body 12 depending on circumstances, etc. The present invention can be configured in various modifications without departing from the spirit of the present invention.

It is a figure of the pressure-reduction valve apparatus which is one Embodiment of this invention. It is an enlarged view of the principal part of the embodiment. It is the figure which showed an example of the conventional pressure reducing valve apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pressure reducing valve apparatus 12 Main body body 16 Inlet 18 Outlet 22 Liquid passage 22A Primary side liquid passage 22B Secondary side liquid passage 24 Pressure reducing valve 26 Pressure reducing valve body 56 Check valve 62 Check valve body 80 Stopper mechanism 82 Stopper member

Claims (3)

A main body provided with a liquid inlet and outlet, a liquid passage formed inside the main body and connecting the inlet and outlet, and a flow rate of the liquid in the liquid passage is reduced to reduce pressure. And the pressure reducing valve body of the pressure reducing valve in a direction to decrease the valve opening in accordance with an increase in the primary side liquid pressure, and in response to a decrease in the primary side liquid pressure. In the pressure reducing valve device that holds the secondary side liquid pressure at a constant set pressure lower than the primary side liquid pressure, in the primary side liquid passage upstream of the pressure reducing valve, A check valve that allows only the flow of liquid from the primary side liquid passage to the secondary side liquid passage downstream from the pressure reducing valve and prevents reverse flow is provided, and the check valve body is opened. Sometimes, the valve opening of the check valve body is regulated to an opening smaller than the maximum opening degree by bringing a stopper member into contact with the check valve body. A stop mechanism that can be controlled is provided, and a throttle mechanism that restricts the flow rate of the liquid from the primary-side liquid passage to the secondary-side liquid passage is configured by the check valve and the stopper mechanism. Pressure reducing valve device.   2. The pressure reducing valve device according to claim 1, wherein the stopper mechanism includes an adjustment mechanism that adjusts a liquid throttling amount by adjusting a contact position of the stopper member with respect to the check valve body. .   3. The pressure reducing valve device according to claim 1, wherein the check valve is provided in the primary liquid passage inside the main body, and the stopper mechanism is provided in the main body. .

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