JP3118088U - Pressure reducing valve - Google Patents

Abstract

A pressure reducing valve is provided with a replaceable strainer, and at a position before the pilot valve, impurities contained in a fluid that can come into contact with the pilot valve are removed, thereby improving the operability of the pilot valve. Eliminate the problem of worsening.
A main valve for adjusting a primary pressure of an upstream fluid to reduce it to an appropriate secondary pressure and supplying it to the downstream side, and a primary pressure and a secondary pressure for adjusting the main valve. And a pilot valve configured to be adjusted in accordance with the flow rate, and is disposed on a flow passage that causes the fluid to flow in a predetermined path from the upstream side, which is the supply source, to the downstream side with a finite pressure. In the pressure reducing valve, an impurity contained in the fluid that causes malfunction of the pilot valve is introduced between the inlet of the primary pressure fluid flowing into the pressure reducing valve and the pilot valve. It is characterized by interposing a strainer for removal.
[Selection] Figure 2

Description

  The present invention relates to a pressure reducing valve for adjusting and holding a secondary fluid pressure at a constant pressure lower than a primary fluid pressure.

  Conventionally, a pressure reducing valve for adjusting and holding the fluid pressure on the secondary side at a constant pressure lower than the fluid pressure on the primary side is known and widely used for controlling the fluid pressure. The pressure reducing valve is a so-called bellows type direct acting pressure reducing valve, which is often used when the steam capacity is relatively small and extremely accurate pressure control is not necessarily required, and more accurate pressure control. There is known a pilot operated pressure reducing valve that is configured to be capable of being used and is used when a relatively high and accurate pressure control is required.

  As shown in FIG. 9, the latter pilot operated diaphragm type pressure reducing valve (100) has a main valve (101) for obtaining an appropriate secondary pressure corresponding to a load, and for adjusting the main valve (101). In order to obtain the control pressure as the motive power from the partial pressure of the fluid on the primary side, it is constituted by two valve mechanisms including a pilot valve (102) for controlling the pressure.

  The pressure reducing valve (100) includes a main valve (101) for adjusting the pressure on the secondary side to a constant pressure lower than that on the primary side, and is normally urged in the valve closing direction by the urging means (103). ing. The main valve (101) includes a pressure receiving body (104) to which a pilot pressure branched from the primary side is added. The biasing means (108) opens the pilot valve to apply pilot pressure to the pressure receiving body (104), and opens the main valve to flow the primary pressure side fluid to the secondary side. The pressure reducing valve includes a valve chamber (107) having a primary side inlet (105) and a secondary side outlet (106), and a pilot valve (102) provided with an urging means (108) for opening and closing the pilot pressure therein. ) And the pressure receiving body (104). A pressure receiving chamber (109) is formed facing the urging means (108) of the pilot valve (102), and a secondary pressure is introduced. The opening and closing of the pilot valve is controlled by the balance between the biasing force of the biasing means (108) and the secondary pressure. Such pilot-actuated pressure reducing valves are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 7-295656, 2001-75653, and 2004-164186.

  However, in such a pilot-actuated pressure reducing valve, impurities contained in the fluid may adhere to or clog the periphery of the valve, particularly around the pilot valve, leading to malfunction of the valve or causing failure. There was a fear.

JP-A-7-295656 JP 2001-077563 A JP 2004-164186 A

  The present invention has been made in view of the above problems, and the pressure reducing valve incorporates a strainer that is configured to be exchangeable from the outside to remove impurities contained in the fluid flowing through the pilot valve. The purpose is to eliminate the problem of worsening the operation.

  Means taken by the present invention to solve the above-mentioned problem is that a valve element disposed in a valve body is separated from a primary-side pressure fluid by a biasing means that can be adjusted from the outside and a pilot valve that is controlled by a secondary-side pressure. In a pressure reducing valve that controls the opening and closing of the branching pilot pressure and controls the opening and closing of the main valve with the pilot pressure so that the secondary pressure is adjusted and held at a constant pressure lower than the pressure on the primary side, the pilot valve and the primary pressure Impurity removing means for removing impurities in the fluid is disposed in the branch passage communicating with the fluid inlet.

  Also, a main valve for adjusting the primary pressure of the upstream fluid to a predetermined pressure and supplying it to the secondary side, and opening and closing by the biasing means and the secondary pressure to adjust the opening and closing of the main valve A pressure reducing valve having a pilot valve to be controlled and adjusting and holding the pressure on the secondary side at a constant pressure lower than that on the primary side, and an inlet and pilot valve for the primary pressure fluid flowing into the pressure reducing valve body In addition, a strainer for removing impurities contained in the fluid is interposed between the strainer and the strainer, which can be taken out from the outer surface of the valve body, so that the strainer can be easily replaced or cleaned. It is characterized by doing so.

  Further, the pilot pressure controlled to open and close by the pilot valve is used as the driving force of the main valve.

  Further, it has an elastically urging means adjustable from the outside for controlling the opening and closing of the pilot valve, a pressure receiving body acting in a direction opposite to the urging means, and a pressure receiving chamber for accommodating the pressure receiving body. A secondary pressure is applied to the body, and the pilot valve is opened and closed opposite to the urging force by the urging means.

  Furthermore, the pilot valve mechanism part including the pilot valve and the strainer and / or the pilot valve urging mechanism part including the urging means for adjusting the opening and closing of the pilot valve are unitized and detachably connected to the main valve mechanism part including the main valve. It is characterized by that.

  According to the present invention, by incorporating the strainer interposed between the inlet and the pilot valve, impurities can be removed from the fluid flowing through the pilot valve, and the deterioration of the operability of the pilot valve can be eliminated. it can.

  Also, the main valve mechanism, the pilot valve mechanism and / or the pilot valve urging mechanism are independent units. In particular, the main valve mechanism and the pilot valve urging mechanism are each of the conventional configuration, and these are the pilot units. By configuring so that they can be connected to each other via the valve mechanism part, the existing pressure reducing valve already arranged in the pipeline is used as it is while using the main valve mechanism part or the pilot valve biasing mechanism part as it is. The pilot valve mechanism can be easily exchanged with that of the present invention, and there is an effect that the pressure reducing valve having the effect of the strainer can be improved.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a part of the pressure reducing valve (1) according to the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of the pressure reducing valve (1). FIG. 3 is an exploded view around the pilot valve body (2) of the pilot valve of the pressure reducing valve (1). FIG. 4 is a cross-sectional view similar to FIG. 2 of a conventional pressure reducing valve having a structure substantially equivalent to the pressure reducing valve of the present invention.

  1-3, the pressure reducing valve (1) includes a main valve mechanism portion (3) including a main valve, and a pilot valve mechanism portion (6) including a pilot valve connected and disposed immediately above the main valve mechanism portion (3). Further, a pilot valve biasing mechanism (4) including an adjustment biasing means (7) for applying a biasing force to the pilot valve connected to the upper portion thereof and controlling the opening and closing of the pilot valve body (2) is provided. It is configured.

  The main valve mechanism portion (3) constitutes a valve body, and includes a flange-like primary side connecting portion (8) for connecting to the upstream side connecting portion of the fluid transfer pipe, and a primary side connecting portion. A primary pressure inlet (9) provided substantially at the center of (8), an inlet (10) for introducing a fluid into the pressure reducing valve (1) via the inlet (9), and a primary side The outflow path (11) for flowing the introduced fluid downstream, the secondary pressure outlet (12) at the tip of the outflow path (11), and the outlet (12) are located at the center. And a flange-like secondary side connecting portion (13) for connecting to the secondary side pipe.

  The main valve mechanism (3) is provided with a main valve chamber (14) through which fluid from the inflow passage (10) can freely flow. The main valve chamber (14) and the outflow passage ( 11) is connected through the main valve port (15), and the inflow passage (10) and the outflow passage (11) communicate with each other through the main valve chamber (14). A main valve body (16) capable of opening and closing the main valve port (15) is disposed in the main valve chamber (14). Further, on the upper part of the main valve body (16), an urging means (17) for urging the main valve body (16) in a direction in which the main valve body (16) closes the main valve port (15). A pressure receiving body (18) connected to the lower part of the main valve body (16) via a connecting rod (16a), and the main valve body (16) so as to be movable in the opening and closing direction. A pressure receiving chamber (19) for accommodating the pressure receiving body (18) is provided.

  The pilot valve mechanism section (6) is configured to communicate a fluid from the branch port (20) formed so as to communicate with the main valve chamber (14) of the main valve mechanism section (3). A strainer (21) having a filter element for removing impurities such as dust and solute contained in the introduced fluid while being introduced into the valve mechanism (6) is disposed. A pilot valve chamber (22) configured to be able to introduce the passed fluid is disposed. A pilot valve body (2) is disposed in the pilot valve chamber (22), and is configured to open and close the pilot valve according to the primary pressure and the secondary pressure. The strainer (21) is housed in a strainer storage chamber (23) with one end open outward from the outer surface of the pilot valve mechanism (6), and can be freely removed and attached, allowing the strainer to be replaced. It is.

  Referring to FIG. 3, the pilot valve penetrates the ball-shaped pilot valve body (2), the connecting rod (2a) for connecting the valve body (2) to the pressure receiving body (24), and the connecting rod (2a). The pilot piece body (5), the spring (29) for urging the pilot valve body (2) in the valve closing direction, and the pilot valve body (2) and the frame (30) holding the spring (29) Arranged in the valve chamber (22).

  The pilot valve urging mechanism (4) includes a pressure receiving body (24) that contacts the connecting rod (2a) of the pilot valve body (2), and an elastic urging force such as a spring adjusted to the pressure receiving body (24). Means (7) and an urging force adjusting screw (25) configured to adjust the urging force of the urging means (7) from the outside. The pressure receiving body (24) is arranged to receive the pressure in the pressure receiving chamber (26) created at the upper end with the pilot valve urging mechanism (4), and the secondary pressure is received in the pressure receiving chamber (26). The pressure of the secondary fluid introduced through the passage (27) is received. The opening and closing of the pilot valve is controlled by the balance between the urging force of the urging means (7) and the secondary pressure. When the pilot valve (2) is opened, the primary pressure fluid that has passed through the strainer (21) and has flowed into the pilot valve chamber (22) from the primary side passes through the pilot pressure passage (28) and the pressure receiving body (18 ) Is introduced into the pressure receiving chamber (19) in which the main valve (16) is accommodated.

  Next, the operation of the pressure reducing valve according to the present invention will be described in detail with reference to FIGS. FIG. 5 shows a state in which the urging means (7) is not adjusted, and the pilot valve body (2) is in a closed state. Accordingly, the pilot pressure is not applied to the pressure receiving body (24) of the main valve (16), and the main valve (16) is also closed. In this state, when the urging force adjusting screw (25) is screw-rotated to compress the urging means (7) made of a spring and the urging force is applied to the pressure receiving body (24), the connecting rod (2a) is lowered, and the pilot valve The pilot valve opens by pushing down the body (2).

  By opening the pilot valve, the pilot pressure branched from the primary pressure as shown in FIG. 6 is introduced into the pressure receiving chamber (19) via the pilot pressure passage (28) and moves up the pressure receiving body (18). Due to the upward movement of the pressure receiving body (18), the connecting rod (16a) rises and the main valve body (16) opens. As a result, the primary pressure flows to the secondary side. The pressure that has flowed to the secondary side is introduced into the pressure receiving chamber (26) of the pilot valve mechanism through the secondary side passage and added to the pressure receiving body (24) (see FIG. 7). When the elastic biasing force applied to the upper surface of the pressure receiving body (24) is greater than the secondary pressure applied to the lower surface of the pressure receiving body (24), the open state of the pilot valve is maintained and the main valve body ( 16) is maintained open.

  When the pressure on the secondary pressure side rises, as shown in FIG. 8, the pressure applied to the pressure receiving body (24) also increases, and when the elastic biasing force is exceeded, the pressure receiving body (24) moves up, The pilot valve body (2) closes. Since the pilot valve body (2) is closed, the pilot pressure applied to the pressure receiving body (18) of the main valve mechanism disappears, so that the main valve body (16) is elastic of the biasing means (17) made of a spring. It descends due to force and closes. By closing the valve, the pilot pressure in the pressure receiving chamber (19) is discharged to the secondary side through the pilot pressure discharge passage (31). The pilot pressure discharge passage (31) is connected to the pilot pressure passage (28) via a check valve.

  The pressure reducing valve (1) of the embodiment shown in FIGS. 1 to 3 is configured as described above. In particular, the main valve mechanism portion (3) and the pilot valve biasing mechanism portion (4) are each shown in FIG. The main valve mechanism (3) and the pilot valve urging mechanism (4) in the pressure reducing valve are substantially the same, and the conventional pilot valve mechanism can be replaced with the pilot valve mechanism (6) of the present invention. Configured to be able to. As a result, it is possible to change to the structure of the pilot type pressure reducing valve equipped with the strainer of the present invention without removing the existing pressure reducing valve already disposed in the pipe, and the pilot valve has a problem. It is possible to introduce a system that can remove impurities contained in the fluid around the pilot valve that has been installed at a low cost, and it is possible to replace only the strainer (21) and to perform maintenance easily. It can be done. Further, the pressure reducing valve (1) of the present invention can be changed as appropriate without departing from the gist of the above configuration.

The perspective view which cut down some pressure reducing valves concerning the device An enlarged cross-sectional view of the main part of the pressure reducing valve Exploded view around the pilot valve body of the pressure reducing valve Sectional drawing of the conventional pressure reducing valve which has the main valve mechanism part of the structure substantially equivalent to the pressure reducing valve, and a pilot valve biasing mechanism part The figure which shows the non-operation state of the pressure reducing valve concerning this device The figure which shows the state which changed to the adjustment state and the pilot valve opened The figure which shows the state in which secondary pressure was introduced into the pressure-receiving chamber of the pilot valve The figure which shows the state which the pilot valve closed by the rise of secondary pressure similarly A diagram schematically showing the operating principle of a conventional pilot operated diaphragm type pressure reducing valve

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure reducing valve 2 Pilot valve body 3 Main valve mechanism part 4 Pilot valve urging mechanism part 5 Pilot piece body 6 Pilot valve mechanism part 7 Energizing means 8 Primary side connection part 9 Inlet
10 Inflow channel
11 Outflow channel
12 Outlet
13 Secondary side connection
14 Main valve chamber
15 Main valve
16 Main disc
17 Energizing means
18 Pressure sensing element
19 Pressure chamber
20 Branch
21 Strainer
22 Pilot valve chamber
23 Strainer chamber
24 Pressure receiver
25 Force adjusting screw
26 Pressure chamber
27 Secondary pressure passage
28 Pilot pressure passage
29 Spring
30 frames
31 Pilot pressure discharge passage
100 Pressure reducing valve
101 Main valve
102 Pilot valve
103 Energizing means
104 Pressure receiver
105 Primary side entrance
106 Secondary exit
107 Valve chamber
108 Energizing means
109 Pressure chamber

Claims (7)

  The valve body arranged in the valve body is controlled to open and close the pilot pressure branched from the primary pressure fluid by a pilot valve controlled by an externally adjustable biasing means and secondary side pressure, and the main valve is controlled by the pilot pressure. In a pressure reducing valve that adjusts and holds the pressure on the secondary side at a constant pressure lower than the pressure on the primary side by controlling the opening and closing of the fluid, the pilot valve and the inlet of the primary pressure fluid are in the branch passage communicating with each other in the fluid. A pressure reducing valve having an impurity removing means for removing impurities.   Opening / closing control is performed by a main valve for adjusting the primary pressure of the upstream fluid to a predetermined pressure and supplying it to the secondary side, an urging means for controlling opening / closing of the main valve, and the secondary pressure. A pressure reducing valve, wherein the pressure on the secondary side is adjusted and held at a constant pressure lower than that on the primary side, between the inlet of the primary pressure fluid flowing into the pressure reducing valve body and the pilot valve. And a strainer for removing impurities contained in the fluid.   The pressure reducing valve according to claim 1 or 2, wherein the fluid pressure branched from the primary side pressure-controlled by the pilot valve is used as a driving force for adjusting the main valve.   An elastically biasing means that can be adjusted from the outside for controlling the opening and closing of the pilot valve, a pressure receiving body that acts in a direction opposite to the biasing means, and a pressure receiving chamber that accommodates the pressure receiving body. The pressure reducing valve according to any one of claims 1 to 3, wherein a secondary pressure is applied to open and close the pilot valve in opposition to the urging force of the urging means.   The pressure reducing valve according to any one of claims 1 to 4, wherein a pilot valve mechanism including a pilot valve and a strainer is unitized and detachably connected to a main valve mechanism including a main valve.   A pilot valve mechanism including a pilot valve and a strainer and a pilot valve urging mechanism including an urging means for adjusting the opening and closing of the pilot valve are individually unitized and detachably connected to the main valve mechanism including the main valve. The pressure reducing valve according to any one of claims 1 to 5, wherein The pressure reducing valve according to any one of claims 1 to 6, wherein the strainer can be removed from the outer surface of the valve body so that the strainer can be easily replaced or cleaned.

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