JP6470862B1 - Forced on / off valve mechanism for main valve - Google Patents

Abstract

An object of the present invention is to forcibly control the opening degree of a main valve so as to cope with various situations that cannot be dealt with by a normal function of a normal pilot type back pressure valve and other pilot type automatic control valves. In a pilot-type automatic control valve in which a main body is a diaphragm valve, an upright pipe having a predetermined height that protrudes upward from a diaphragm and that is inserted and supported in a watertight manner protrudes from the upper portion of the main body. And a nut 22 into which the valve rod 18 projecting outward from the upper end opening 21a of the upright pipe 21 is screwed is provided on the end surface 21b of the upper end opening 21a so as to be attachable / detachable. A cap 23 having a cap is detachably attached to the upright pipe 21, and an adjustment screw 24 is screwed into and penetrated from the upper end surface of the cap 23 so that the lower end can be attached to and detached from the upper end of the valve rod 18 inside the cap 23. . [Selection] Figure 5

Description

  The present invention relates to a forced open / close valve mechanism of a main valve used for a pilot type back pressure valve and other pilot type automatic control valves.

  For example, in countries with severe water resource shortages, a sufficient water distribution network is not in place, so the desired amount of water supply can be secured in upstream areas such as near water purification plants and distribution towers, but away from upstream areas. Water supply pressure tends to be insufficient in the distribution end areas and high altitude areas, and a certain amount of water supply cannot be secured.

  In view of this, a pilot-type back pressure valve (see, for example, Patent Document 1) is disposed at a necessary point in the piping path, and the water supply pressure is distributed fairly from the upstream to the downstream end by controlling the water distribution pressure on the upstream side of the water supply. It is possible.

Japanese Patent No. 3341198

However, if the distribution network is not sufficiently maintained as described above, the distribution pressure and the distribution amount tend to be insufficient, and it is assumed that the pilot-type back pressure valve cannot be controlled alone.
This is not limited to the above-described pilot-type back pressure valve, and other pilot-type automatic control valves have a problem that they cannot be addressed only by their original functions.

  Therefore, in the present invention, the main valve is forcibly opened and closed so that the opening degree of the main valve can be forcibly controlled so as to cope with various situations that cannot be dealt with by the normal function of the pilot type back pressure valve and other pilot type automatic control valves. It aims to provide a valve mechanism.

In view of the above problems, the forced on / off valve mechanism of the main valve according to the present invention has an inlet and an outlet on the side of the main body, a primary flow path communicating with the inlet, and a secondary side communicating with the outlet The flow path is partitioned within the main body, and the primary flow path and the secondary flow path are connected via the valve port, and the main valve provided to open and close the valve port is closed by the valve spring. The diaphragm is energized in the direction of the valve, and the inside of the main body is divided into a pressure chamber provided on the back side of the diaphragm and a primary flow path side by a diaphragm provided in communication with the main valve to form a diaphragm valve. The pressure chamber is provided with a pilot valve port that communicates with the secondary side flow path, and the pilot valve that opens and closes the pilot valve port is a pressure that causes the elastic force of the pressure setting spring to act on the top surface and the primary side pressure to act on the bottom surface Pilot-type back pressure valve connected to the response member and connected to the pressure chamber via the restriction on the primary side Alternatively, in a pilot-type automatic control valve that opens and closes the main valve by controlling the power necessary for the operation of the main valve of the diaphragm valve by the pilot valve, the upper part of the valve rod protruding upward from the center of the diaphragm is inserted in a watertight manner. the predetermined height standpipe of supporting projecting from the upper body, ChakuHanare capable provided nut screwed the valve stem to outward protrude from the upper opening of the standpipe to the end surface of the top opening, the valve stem Has a male screw whose length is pulled up until the main valve is fully opened by the screwing of the nut, and a cap having a height higher than the upper limit position of the valve stem is detachably crowned on the upright pipe, and the valve inside the cap An adjustment screw is screwed into and penetrated from the upper end surface of the cap so that the lower end can be attached to and detached from the upper end of the rod.

In short, the forced open / close valve mechanism of the main valve in the pilot type back pressure valve of the present invention has the above-described configuration, so that the portion corresponding to the end face of the upper end opening of the upright pipe in the valve stem with the main valve closed is usually By placing the nut above the part and placing the lower end of the adjusting screw at a height higher than the upper limit of the upper end of the valve stem when the main valve is fully open, the fluid pressure on the primary side is maintained at a certain constant pressure. Thus, it can function as a general back pressure valve that adjusts the primary pressure by discharging the upstream water to the secondary side in accordance with the change in the primary pressure.
In addition, when it is assumed that the water on the secondary side is excessively used and the primary pressure falls below the set pressure, the portion corresponding to the end face of the upper end opening of the upright pipe in the valve stem when the main valve is closed Alternatively, by placing a nut above the part and disposing the lower end of the adjustment screw at the upper end position of the valve stem corresponding to the opening smaller than the fully opened state of the main valve, the opening that should be fully opened is made smaller than the fully opened position. By controlling the flow rate as appropriate, it is possible to prevent the upstream (primary) water amount from being depleted.
In addition, when a sufficient amount of water for operating the back pressure valve is not supplied to the primary side, a nut corresponding to the upper end opening end face of the upright pipe in the valve stem with the main valve closed or a nut above the part Rotate the adjusting screw and push the upper end of the valve stem until the main valve closes at the lower end to shut off the primary side and the secondary side, or to turn the nut. The main valve is forcibly held at the desired degree of opening by pulling up the valve stem until the opening of the main valve is appropriately maintained smaller than the fully open position, and by screwing the upper end of the valve stem with the lower end of the adjusting screw. To secure a certain amount of water.
Furthermore, according to the present invention, the secondary pressure can be removed from the primary side flow path through the valve opening where the main valve is fully opened without causing the back pressure function to work, just by pulling up the nut until the main valve is fully opened by screwing the nut. For example, when piping work, if a back pressure valve is inserted in the piping, the back pressure valve functions and hinders the piping work. Since the back pressure valve may break down, a bypass pipe is connected to the back pressure valve in parallel so that the back pressure valve in the piping does not function, or a substitute pipe for the purpose of only passing water by removing the back pressure valve is attached. After piping work, it was no longer necessary to perform prior work such as removing the bypass pipe or replacing the substitute pipe with a back pressure valve, and the piping work was simply carried out with the back pressure valve attached to the pipe. The above cannot be dealt with by the normal back pressure valve function. It can cope with seed situation.

  Further, the forced on-off valve mechanism according to the present invention is used for a pilot operated valve other than the pilot back pressure valve, for example, a pilot pressure reducing valve, a pilot constant water level valve, etc., thereby forcibly opening the opening of the main valve. Since it is controllable, its practical effect is significant, such as being able to adjust the flow rate corresponding to various situations that cannot be dealt with by the normal function of the pilot type automatic control valve.

It is a longitudinal cross-sectional view which shows the valve closing state of the main valve in normal use of the pilot type back pressure valve equipped with the forced on-off valve mechanism according to the present invention. It is a longitudinal cross-sectional view which shows a fully open state same as the above. It is an expanded sectional view of a pilot valve. It is an expanded sectional view of an aperture stop. It is a principal part enlarged view of FIG. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a principal part expanded sectional view which shows the half-opened state at the time of setting the upper limit of a main valve to half-open with a forced on-off valve mechanism. It is a principal part expanded sectional view which shows the forced valve closing state of the main valve by a forced on-off valve mechanism. It is a principal part expanded sectional view which shows the forced half open state of the main valve by a forced on-off valve mechanism. It is a principal part expanded sectional view which shows the forced full open state of the main valve by a forced on-off valve mechanism.

An embodiment of the present invention will be described below with reference to the drawings.
The pilot-type back pressure valve shown in the figure is composed of a diaphragm valve whose main body 1 is mainly composed of a valve box 2 and a bonnet 3, and is necessary for the operation of a main valve 13 which will be described later, which is built in the diaphragm valve (main body) 1. This is a pilot (actuated) type valve that opens and closes the main valve 13 by controlling the power (pressure difference between the primary side pressure and the secondary side pressure) to be increased or decreased by a pilot valve 27 described later.

  An inlet 4 and an outlet 5 are opened on the same horizontal axis on the left and right sides of the valve box 2, and a primary-side flow path 6 communicating with the inlet 4 and an outlet 5 are communicated inside the valve box 2. The secondary side flow path 7 is provided, and the secondary side flow path 7 is partitioned by the partition wall 8 so that the secondary side flow path 7 is disposed inside and the primary side flow path 6 is disposed outside thereof.

  An upward valve port 9 whose axis is perpendicular to the axis of the inlet 4 is formed in the partition wall 8, and the primary channel 6 and the secondary channel 7 are communicated with each other through the valve port 9.

An opening 2a that communicates with the primary flow path 6 and the valve port 9 is provided at the upper end of the valve box 2, and the opening 2a is located between the valve box 2 and the bonnet 3 that covers the upper part thereof. It is blocked by an intervening diaphragm 10.
A strainer 11 is provided around the valve port 9 in the opening 2a.

  The bonnet 3 is provided with a concave space that is partitioned from the inside of the valve box 2 (primary flow path 6 side) by a diaphragm 10 inside thereof, and the concave space corresponding to the back surface (upper surface) side of the diaphragm 10 is pressurized. Consists of Chamber 12.

  The diaphragm 10 is provided with a main valve 13 projecting annularly from the lower surface of the diaphragm 10 so as to correspond to a valve seat 9a provided around the valve port 9 on the lower surface thereof, and thus the main valve 13 is integrated with the diaphragm 10 in this way. By forming, the main valve 13 and the diaphragm 10 are connected.

  Diaphragm retainers 14 and 14a are joined to the lower surface of the diaphragm 10 inside the main valve 13 and the upper surface of the diaphragm 10 corresponding to the main valve 13, respectively, and the valve port 9 is formed in the cross direction of the lower diaphragm retainer 14a. Four guide blades 15 whose outer edges slide on the inner wall are vertically provided.

  A coiled valve spring 16 is interposed between the upper portion of the pressure chamber 12 and the upper disk-shaped diaphragm retainer 14, and the main valve 13 is urged in the valve closing direction by the valve spring 16. Yes.

  The upper end of the valve spring 16 is supported by being externally fitted to a flat inverted frustoconical convex portion 17 that hangs down from the center of the pressure chamber 12 (bonnet 3).

  In addition, a valve rod 18 penetrating through the center of the convex portion 17 of the bonnet 3 through the diaphragm retainer 14 is projected upward at the center of the diaphragm 10. By controlling the position and state of the valve rod 18 on the bonnet 3, A forced opening / closing valve mechanism 19 for forcibly controlling the opening degree of the main valve 13 is provided.

  The forced opening / closing valve mechanism 19 has an upright pipe 21 having a predetermined height protruding above the valve rod 18 in a watertight manner by an O-ring 20 and protruding from the upper portion of the main body 1 (bonnet 3).

Then, ChakuHanare capable provided on the end face 21b of the upper opening 21a of the nut 22 screwed to the valve stem 18 to outwardly protrude from the upper opening 21a of the standpipe 21, valve stem 18 is primarily in the screwing of the nut 22 A cap 23 having a length of male screw (not shown) that is pulled up until the valve 13 is fully opened and having a length higher than the upper limit position of the valve stem 18 when the main valve 13 is fully opened can be attached to and detached from the upright pipe 21 Is crowned.

  The cap 23 can be attached to and detached from the upright pipe 21 by screwing and unscrewing the female screw threaded on the inner periphery of the lower end opening of the cap 23 onto the male thread threaded on the outer periphery of the upright pipe 21. 22 is screwed and unscrewed by removing the cap 23.

  The upper end surface of the cap 23 is threaded through an adjusting screw 24 into the cap 23 from the upper end surface, and the lower end of the adjusting screw 24 can be attached to and detached from the upper end of the valve stem 18 inside the cap 23. The adjusting screw 24 is screwed with a lock nut 24a.

  On the outlet 5 side (right side in the figure) on the bonnet 3, a protruding port 25 communicating with the pressure chamber 12 is provided to project upward, and an inlet 28 of the pilot valve 27 is connected to the protruding port 25 via a throttle pipe 26. It is connected in a watertight manner.

  The pilot valve 27 is provided with an angle-shaped valve box 30 in which the flow paths of the inlet 28 and the outlet 29 are perpendicular to each other, and in the valve box 30, a pilot valve port 31 is provided on the same axis as the inlet 28, The pilot valve port 31 communicates with the secondary flow path 7 connected to the outlet 29 via the secondary communication path 32.

  A pilot valve seat 31a made of an annular ridge is provided on the upper end surface of the pilot valve port 31, and a child valve 33 that opens and closes the pilot valve port 31 by being separated from the pilot valve seat 31a is provided at the lower end of the valve shaft 34. Yes.

  The valve shaft 34 is the center of the lower portion of a funnel-shaped recess 35 provided in the upper portion of the valve box 30 and is formed in an O-ring into a valve stem guide hole 36 formed on the same axis as the pilot valve port 31 below the recess 35. It is inserted and supported so as to slide in a watertight manner.

  Then, a flange provided around the upper opening end of the recess 35 and a flange provided around the lower opening end of the spring cover 37 covering the recess 35 are joined via a pressure responsive member 38 made of a pilot diaphragm. The lower surface center of the pressure responsive member 38 is fixed to the upper end of the valve shaft 34, the child valve 33 is connected to the pressure responsive member 38, and the inner space of the recess 35 defined by the pressure responsive member 38 is connected to the pilot pressure chamber. 39.

  A substantially disc-shaped spring retainer 40 that also serves as a diaphragm retainer joined to the upper surface of the pressure responsive member 38, and a lower end of an adjustment bolt 41 that is screwed and penetrated into the spring cover 37 from the upper surface of a flat circular step portion 37a projecting from the upper end of the spring cover 37. A pressure setting spring 42 is interposed between the spring receiver 40a and the abutting spring receiver 40a so that the elastic force of the pressure setting spring 42 is applied to the upper surface of the pressure responsive member 38. It is adjusted by movement.

  A lock nut 41a is screwed onto the adjustment bolt 41, and the adjustment bolt 41 is covered with a top cap 43 whose lower end opening can be screwed onto the flat circular step portion 37a.

  The pilot pressure chamber 39 connects a primary side communication path 44 between the primary side flow path 6 and the primary side flow path 44 so that the primary side pressure is applied to the lower surface of the pressure responsive member 38. A strainer 45 is put on the opening desired for the road 6 (see FIGS. 1 and 2).

Further, the primary side flow path 6 and the pressure chamber 12 are separately communicated by a primary side communication path 46, and a throttle 47 composed of a spiral narrow path is interposed in the primary side communication path 46. While the valve port 9 is closed, fluid is gradually supplied to the pressure chamber 12 while controlling the pressure in the pressure chamber 12 to eliminate the impact of a water hammer or the like when the valve is closed.
In addition, a strainer 48 is crowned on the opening desired in the primary flow path 6 of the primary communication path 46 (see FIGS. 1 and 2).

In the pilot-type back pressure valve configured as described above, a portion corresponding to the end surface 21b of the upper end opening 21a of the upright pipe 21 in the valve rod 18 in a state in which the main valve 13 is closed or from the portion A nut 22 is disposed above (in the illustrated example, seated on the end surface 21b of the upper end opening, see FIGS. 1 and 5), and the height position (upper limit in the illustrated example) of the upper end of the valve stem 18 when the main valve 13 is fully opened. The lower end of the adjusting screw 24 is arranged at the position (see FIGS. 2 and 6).
Thus, by setting the forced on / off valve mechanism 19, it can function as a general back pressure valve as follows.

  That is, when the primary side pressure becomes higher than the set pressure, the pressure responsive member 38 resists the elastic force of the pressure setting spring 42 by the (primary side) pressure of the fluid flowing into the pilot pressure chamber 39 from the primary side communication passage 44. Displacement is made upward (in the valve opening direction of the child valve 33), whereby the child valve 33 is separated from the pilot valve seat 31a via the valve shaft 34, and the pilot valve port 31 is opened.

By opening the valve, the pressure chamber 12 communicates with the secondary flow path 7 through the secondary communication path 32.
Further, the pressure fluid flowing into the pressure chamber 12 from the primary side communication path 46 does not stay in the pressure chamber 12 but flows down from the secondary side communication path 32 to the secondary side flow path 7 and the outlet 5.

  Since the pressure in the pressure chamber 12 drops until it becomes equal to the secondary pressure, the primary valve 13 is displaced by the primary pressure so as to push up the diaphragm 10 in the valve opening direction. It separates and the valve port 9 is opened.

  Thereby, the inflow port 4 (primary side channel 6) and the outflow port 5 (secondary side channel 7) communicate with each other via the valve port 9, and the primary pressure fluid flows down to the outflow port 5 side. Primary pressure drops.

  When the primary pressure on the primary flow path 6 side is lower than the set pressure, the elastic force of the pressure setting spring 42 moves down the pressure responsive member 38 against the primary pressure in the pilot pressure chamber 39 (closes the child valve 33). In the opposite direction, the child valve 33 is seated on the pilot valve seat 31a and the pilot valve port 31 is closed.

  As a result, the secondary flow path 7 and the pressure chamber 12 are blocked, the primary pressure fluid from the primary communication path 46 is supplied into the pressure chamber 12, and the pressure chamber 12 is connected to the primary side. The diaphragm 10 is displaced in the valve closing direction (downward) of the main valve 13 by the elastic force of the valve spring 16, so that the main valve 13 is seated on the valve seat 9 a and the valve port 9 is closed. To do.

  Further, when it is assumed that water is used excessively at the secondary side and the primary side pressure is lower than the set pressure, the valve stem 18 is closed in the valve stem 18 with the main valve 13 closed. A portion corresponding to the end surface 21b or above the portion is arranged with a nut 22 (in the illustrated example, seated on the end surface 21b of the upper end opening), and an opening smaller than the fully opened state of the main valve 13 (for example, a half-open state in the illustrated example, FIG. 7)), the upper (primary) side water volume so that the position where the valve should be fully opened can be completed with a flow rate corresponding to an appropriate opening smaller than the fully opened position. Can be prevented in advance.

  Further, when a sufficient amount of water for operating the back pressure valve is not supplied to the primary side, it corresponds to the end surface 21b of the upper end opening 21a of the upright pipe 21 in the valve rod 18 with the main valve 13 closed. Until the main valve 13 closes the upper end of the valve stem 18 at the lower end thereof, while the nut 22 is disposed (or seated on the upper end opening end face 21b in the illustrated example) and the adjustment screw 24 is screwed. By pushing, the primary side and the secondary side are shut off and the water is shut off (see FIG. 8), or the nut 22 is screwed up and the valve rod 18 is pulled up until the main valve 13 is kept at an appropriate opening smaller than the fully open position. At the same time, the main valve 13 is forcibly held at a desired opening degree by pushing the upper end of the valve rod 18 so as to be pressed by the lower end of the adjusting screw 24 (see FIG. 9).

  Furthermore, according to the present invention, the nut 22 is screwed and the valve rod 18 is pulled up only until the main valve 13 is fully opened, and the back pressure function does not work, and the primary valve 13 is opened through the valve port 9 where the main valve 13 is fully opened. Since water can be passed through the flow path 6 to the secondary flow path 7 (see FIG. 10), for example, when piping is installed, a back pressure valve is inserted in the pipe. May interfere with piping work and may damage the back pressure valve.To prevent the back pressure valve in the piping from functioning, connect a bypass pipe in parallel with the back pressure valve, or remove the back pressure valve once. A replacement pipe for the purpose of only passing water was attached, and after piping work, it was not necessary to perform prior work such as removing the bypass pipe or replacing the substitute pipe with a back pressure valve. Ordinary back pressure valve machine, such as piping work can be easily performed while attached to the pipe. It can cope with the above-mentioned various situations that cannot be handled by Noh.

  In this embodiment, a pilot-type back pressure valve in which the main opening 1 of the diaphragm valve is equipped with a forced opening / closing valve mechanism 19 and the main valve 13 can be forcibly controlled in addition to the original back pressure function is shown. However, not only in this pilot type back pressure valve, but also in other pilot type pressure regulating valves (pressure reducing valves, differential pressure valves, etc.), pilot type solenoid valves, pilot type constant water level valves, and other pilot type automatic control valves, Similarly to the above, the forced on / off valve mechanism 19 can be applied to the main body 1, thereby making it possible to forcibly control the opening of the main valve 13 according to various situations, and various situations that cannot be dealt with by the functions inherent to each valve. It is possible to respond to.

1 Body 4 Inlet 5 Outlet 6 Primary side flow path 7 Secondary side flow path 9 Valve port
10 Diaphragm
12 Pressure chamber
13 Main valve
16 Valve spring
18 Valve stem
21 Upright pipe
21a Upper end opening
21b End face
22 Nut
24 Adjustment screw
27 Pilot valve
31 Pilot valve
38 Pressure sensitive member
42 Pressure setting spring
47 Aperture

Claims (2)

An inflow port and an outflow port are opened on the side of the main body, and a primary-side flow path communicating with the inflow port and a secondary-side flow path communicating with the outflow port are defined in the main body, and the primary-side flow path and The secondary flow path is communicated with the valve opening, the main valve provided to open and close the valve opening is energized in the valve closing direction by the valve spring, and the diaphragm provided in communication with the main valve is used. The inside of the main body is divided into a pressure chamber provided on the back side of the diaphragm and a primary flow channel side, a pilot valve port communicating with the secondary flow channel is provided in the pressure chamber, and a pilot valve for opening and closing the pilot valve port is provided. In the pilot-type back pressure valve in which the elastic force of the pressure setting spring is applied to the upper surface, the pressure response member having the primary pressure applied to the lower surface is connected to the pressure chamber, and the primary flow path is connected to the pressure chamber through a restriction. Upright of a predetermined height that supports and inserts the upper part of the valve stem protruding above the center in a watertight manner The projecting from the upper body, ChakuHanare capable provided nut screwed the valve stem to outward protrude from the upper opening of the standpipe to the end surface of the top opening, the valve stem mainly by screwing of the nut It has a male screw with a length that can be pulled up until the valve is fully opened, and a cap with a height higher than the upper limit position of the valve stem can be detachably crowned on the upright pipe, and the lower end can be attached to and detached from the upper end of the valve stem inside the cap. A forced opening / closing valve mechanism for the main valve, wherein the adjusting screw is screwed into and penetrated from the upper end surface of the cap so that An inflow port and an outflow port are opened on the side of the main body, and a primary-side flow path communicating with the inflow port and a secondary-side flow path communicating with the outflow port are defined in the main body, and the primary-side flow path and The secondary flow path is communicated with the valve opening, the main valve provided to open and close the valve opening is energized in the valve closing direction by the valve spring, and the diaphragm provided in communication with the main valve is used. In the pilot-type automatic control valve which divides the inside of the main body into a pressure chamber provided on the back side of the diaphragm and a primary flow path side, and controls the power necessary for the operation of the main valve by the pilot valve to open and close the main valve, A nut that has an upright pipe that protrudes from the center of the diaphragm and that protrudes from the upper end opening of the upright pipe. the ChakuHanare capable provided on the end face of the top opening, the valve stem main valve fully opened by screwing of the nut A length of the male thread to be pulled until the, bear the removably cap the standpipe with a higher than the upper limit position of the valve stem length, such that the lower end forms possible ChakuHanare the valve stem upper end of the inner cap A forcible on / off valve mechanism for the main valve, wherein an adjusting screw is screwed into the cap from the upper end surface.

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