JP2010007764A - Wafer type valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily position a valve to a tube flange, stably hold a posture of the valve, and efficiently perform a piping operation in piping a wafer type valve. <P>SOLUTION: This wafer type valve comprises a valve box 4 which has flangeless connection ends 10, 11 to tube flanges F, F1 and which is nipped between tube flanges F, F1 fastened by bolts B, B1... and nuts N, N1... and having inlets/outlets 6, 7 of pressure fluid; and a cover flange neck 17 which extends upward from the valve box 4, which has spaces 26, 27 capable of passing the pressure fluid inside, and through which a valve rod 29 communicating a drive part 1 controlling an opening degree of a valve body 3 with the valve body 3 is inserted. In the cover flange neck 17, a through path 28, which are provided between the tube flanges F, F1, and through which the bolts B, B1 adjacent on the circumferences of the tube flanges F, F1, are provided separate from the interior spaces 26, 27. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wafer type valve in which a valve box is sandwiched and fixed between pipe flanges.

Conventionally, in a valve box such as a pressure regulating valve, a type in which a connecting end portion with a pipe is a flange, a so-called flange type has been widely used from low pressure to high pressure. In the flange shape in which the flange is formed, not only the valve itself becomes heavy, but also the manufacturing cost increases only by the material cost of the flange.
For this reason, a wafer-type valve has been developed in which the valve box is not formed with a flange, but the valve box is sandwiched between the pipe flanges and the pipe flanges are fastened together by bolts and nuts (see, for example, Patent Document 1). ).

This valve is formed by constricting the side wall of the cover flange neck extending upward from the valve box, and the constricted portion is installed adjacent to the upper portion of the pipe flange in the piping. The cover flange neck can be inserted between the adjacent bolts, avoiding the bolts, so that the installation state is not hindered. Many bolts arranged on the circumference of the pipe flange are uniformly fastened with nuts, and the valve is made of pipe material. It is fixed in between.
Japanese Patent No. 3863550

  However, since the wafer type valve does not have a flange, the pipe box is sandwiched between the pipe flanges while supporting the valve so that the connection end of the valve is coaxial with the pipe flange during piping. The pipe flanges had to be fastened with bolts and nuts, which was very troublesome and laborious.

In view of the above problems, the wafer-type valve of the present invention is formed between a pipe flange that is clamped by a bolt and a nut and that has a pipe flange that has a pressure fluid inlet / outlet, respectively, and has a flangeless structure. And a valve rod that extends upward from the valve box and has a space through which pressure fluid can pass, and that connects the valve body and a drive unit that controls the opening of the valve body. The cover flange neck is inserted between the pipe flanges, and a through-passage through which each of the bolts adjacent on the circumference of the pipe flange can pass is provided in the cover flange neck. It is characterized by being provided with a partition.
In addition, an annular groove may be formed in the joint surface of each connection end with the pipe flange, and a sealing material may be loaded into the annular groove.

In short, the present invention sandwiches the valve box between the pipe flanges fastened with bolts and nuts, and has a flange-less connection end with the pipe flanges each having a pressure fluid inlet / outlet. Compared to other valves, the overall weight of the valve can be significantly reduced, the surface-to-face (between connecting ends) dimension can be shortened, and the number of bolts required for piping can be halved. The space can be reduced, installation work during piping can be performed efficiently, the load on the pipe material in the piping state can be reduced, and the material cost required for the flange can be reduced, resulting in a dramatic reduction in production costs.
Also, a cover that extends upward from the valve box and has a space through which pressure fluid can pass, and through which a valve rod that connects the valve body and a drive unit that controls the opening degree of the valve body is inserted. The flange neck is provided with a through passage that is installed between the pipe flanges and through which the bolts adjacent to each other on the circumference of the pipe flange can penetrate, so that the pipe flange is provided at the end. When piping with the valve sandwiched between the pipe materials, the valve box is sandwiched between the pipe flanges, and each of the adjacent bolts installed between the pipe flanges is passed through the through passage to change the installation state. Without hindering, the bolt can be passed through all the bolt holes of the pipe flange without any trouble, and by fastening the bolt with a nut, the valve can be piped so as to be interposed between the pipe materials without difficulty.
And in this invention, by providing the penetration path of the said bolt in a cover flange neck, in the case of piping, a bolt is penetrated to the penetration path of a valve and the bolt hole of a pipe flange, and connection of a valve to a pipe flange is carried out. Since the end portion can be set on the same axis, so-called valve positioning can be easily performed, and the posture of the valve can be stably maintained, so that piping work can be performed more efficiently than conventional products.
In addition, since the stable mounting posture of the valve with respect to the pipe flange can be maintained even during use, the valve is not displaced due to vibration or the like generated in the piping system during use.

  Further, according to the present invention, the distance between the bolts differs depending on the type of the pipe flange standardized according to the size of the valve, and even if the distance is narrow, the bolt can be passed through all the bolt holes of the pipe flange without any trouble. By tightening the bolt with a nut, the valve can be piped so as to be interposed between the pipes without difficulty. In this way, the space between the bolts penetrating the cover flange neck is narrow, and the cover corresponding to between the through paths Even if the inside of the flange neck is narrowed due to the formation of the through passage, it is not necessary to narrow it in the bolt installation direction, so the passage area of the pressure fluid that circulates inside the cover flange neck corresponding to the through passage, It can be sufficiently ensured so as not to hinder the operation of the valve body by the drive unit, and the valve function can be performed more satisfactorily.

  An annular groove is recessed in the joint surface of each connection end with the pipe flange, and a sealing material is loaded into the annular groove. If the bolt is inserted, the connection end and the pipe flange are positioned coaxially, and the seal material is coaxially interposed between the connection end and the pipe flange without any effort just by joining them. The connection end and the pipe flange can be sealed and joined, and the working efficiency can be dramatically improved compared to the case where the sealing material is separated and interposed between the connection end and the pipe flange. The effect is great.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a front view showing a piping state of a wafer type valve according to the present invention, FIG. 2 is a sectional view taken along line XX of FIG. 1, FIG. 3 is a longitudinal sectional view of the valve, and FIG. An end view is shown.
This wafer-type valve is a direct acting valve comprising a drive unit 1 that operates by sensing a primary side pressure or a secondary side pressure, and a valve body 3 that opens and closes a flow path 2 connected to the drive unit 1. The illustrated valve is a direct-acting pressure reducing valve.
This wafer-type direct-acting pressure reducing valve has a valve body 3 provided with a flow path 2 (primary side flow path 2a and secondary side flow path 2b) according to the pressure fluctuation of the secondary side flow path 2b. A drive unit 1 for controlling the opening degree of the drive unit 1 is incorporated, and a pressure detection chamber 5 of the drive unit 1 provided in communication with the secondary side channel 2b is provided to detect the pressure of the secondary side channel 2b. In the state, the valve box 4 is sandwiched between the pipe flanges F and F1 provided at the connection ends of the pipe materials P and P1, and the bolts B and B1 passed through the pipe flanges F and F1 (long screws) are nuts N, N1. By fastening with, it is configured to be supported between the pipe flanges F and F1.

The valve box 4 is provided with an inlet 6 and an outlet 7 on the left and right sides thereof, and is provided with a primary channel 2a and a secondary channel 2b that communicate with the inlet 6 and the outlet 7, respectively.
In the center of the valve box 4, there is provided a partition wall 8 in which a primary flow path 2a and a secondary flow path 2b are vertically divided, and a valve port 9 is opened in the partition wall 8 so that both flow paths 2a and 2b communicate with each other. Thus, the flow path 2 of the inlet 6 and the outlet 7 has an S shape.

In addition, the valve box 4 is flangeless so that the connection ends 10 and 11 with the pipe flanges F and F1 respectively having the inlets 6 and 7 of the flow path 2 are sandwiched between the pipe flanges F and F1. The face-to-face dimension is set shorter than the conventional flange-type valve box by the thickness of the flange.
An annular groove 12 is formed in each of the joint surfaces of the connection end portions 10 and 11 with the pipe flanges F and F1, and a sealing material 13 such as an O-ring or a flat packing is formed in the annular groove 12 (see FIG. In the example shown, an O-ring) is loaded.

The upper part of the valve box 4 has a circular dish-shaped recess 16 formed by surrounding a body cover flange (a flange for connection to a bonnet 15 described later) 14 and a cover flange neck 17 provided at the upper end extending upward. is doing.
The bonnet 15 has a substantially cylindrical shape with a lower end formed so as to correspond to the concave portion 16, and a flange 15a is provided around the lower opening end.
Then, the recess 16 and the bonnet 15 are joined via the diaphragm 18, and the flanges 14 and 15 a are fastened by bolts and nuts (not shown), and the adjustment spring 19 is placed in the upper space (inside the bonnet 15) partitioned by the diaphragm 18. Further, the drive unit 1 is configured by forming the lower space (inside the recess 16) as the pressure detection chamber 5.

The adjustment spring 19 is composed of a compression coil spring (a square spring in the illustrated example), and is moved downward by an adjustment screw 21 comprising a diaphragm retainer and a spring holder 20 joined to the upper surface of the diaphragm 18 and a bolt screwed from the upper end of the bonnet 15. A compression support is interposed between the spring receiver 22 and the pressed spring receiver 22.
Then, the adjustment screw 21 is moved up and down to adjust the elastic force of the adjustment spring 19, and the displacement of the diaphragm 18 below the adjustment spring 19 is adjusted.
Note that a lock nut 23 screwed to the adjustment screw 21 is provided at the upper end of the bonnet 15.

The pressure detection chamber 5 (recess 16) has a lower portion so as to communicate with each of the primary flow path 2a and the secondary flow path 2b separately through a space through which the pressure fluid inside the cover flange neck 17 can pass. Is opened, and one opening 24 communicating with the primary channel 2a is formed in a circular shape at the lower center of the pressure detection chamber 5 so as to correspond to the valve port 9, and communicates with the secondary channel 2b. The other opening 25 is formed in a substantially rectangular shape and is adjacent to the one opening 24.
Therefore, the upper end of the partition wall 8 rises and is formed in the cover flange neck 17 so as to partition the openings 24 and 25 adjacent to each other, and the partition wall 8 is connected to the communication path 26 and the primary channel 2a. It is partitioned into a communication path 27 with the secondary channel 2b.

The cover flange neck 17 contacts the pipe flanges F and F1 with the connection end portions 10 and 11 of the valve box 4 and the pipe flanges F and F1 with bolts B, B1. The bolts B and B1 that are installed between and adjacent to each other on the circumference of the pipe flanges F and F1 (installed between the upper parts of the pipe flanges F and F1 in the illustrated example) can be penetrated. A path 28 is provided so as to be separated from the internal space (communication paths 26 and 27) of the cover flange neck 17.
Since the through-passage 28 has an outer width D of the cover flange neck 17 corresponding to the width direction of the communication passages 26 and 27 (the direction perpendicular to the installation direction of the bolts B and B1), it is wider than the interval between the bolts B and B1. Bolts B and B1 are provided to penetrate the left and right sides of the cover flange neck 17, and the distance D1 between the left and right through passages 28 is selected according to the size of the valve. The distance between the bolts B and B1 (the bolt holes adjacent to the pipe flanges F and F1), which are different depending on the type, is set to be equal to or less than the interval.
Therefore, in the cover flange neck 17, the communication passages 26 and 27 are naturally formed to be narrower than the other portions at the locations where the through passages 28 are formed.

If the valve rod 29 (described later) is inserted into the communication passage 26 and the pressure fluid can pass through the portion corresponding to the through-passage 28 formation portion of the communication passage 26 even if the valve rod 29 is inserted, the communication passage 26 has a valve function. Although there is no hindrance, the pressure fluid is throttled by the formation of the through passage 28 in such a portion. Therefore, in order to improve the operability of the valve body 3 by the drive unit 1, the pressure at the location where the through passage 28 is formed It is desirable to increase the fluid passage area.
In addition, pipe flanges F and F1 that are standardized according to the size of the valve are used, so the distance between bolts B and B1 differs depending on the type of pipe flange F and F1, and the distance between them is narrow. Even if the communication passage 26 in the through-passage 28 forming portion is formed narrow in the width direction, it is not necessary to narrow the side wall of the cover flange neck 17 in the installation direction of the bolts B, B1,. No. 26 can secure a predetermined passage area of the pressure fluid, and does not hinder the operation of the valve body 3 by the drive unit 1.

A diaphragm receiver 30 is joined to the lower surface of the diaphragm 18, and a piston 31 having a smaller diameter than that of the communication passage 26 is integrally formed at the lower portion of the diaphragm receiver 30.
The piston 31 is slidably fitted into the communication path 26 above the through-passage 28, and a U-packing 32 is attached to a recessed groove provided around the piston 31, and the primary side flow path 2a and the pressure detection chamber 5 are fitted. Are partitioned in a watertight manner.
A valve rod 29 that passes through the communication passage 26 and the valve port 9 is suspended from the lower center of the piston 31, and a valve body 3 that opens and closes the valve port 9 is attached to the lower end of the valve rod 29. The drive unit 1 is connected.

The valve body 3 is detachably provided on the valve seat 33 provided at the lower opening end of the valve port 9 so as to receive the primary pressure in the valve opening direction, and the opening degree is controlled by the displacement of the diaphragm 18. It is made up of.
Then, with the diaphragm 18 displaced to the lowest limit, the diaphragm receiver 30 is seated on the peripheral edge of the opening 24 of the communication path 26, and the lift of the valve body 3 in this state is restricted.
A guide rod 34 is suspended from the center of the lower portion of the valve body 3, and the guide rod 34 is slidably fitted into a cylindrical recess 35 projecting from the bottom of the valve box 4.
The effective pressure receiving area of the piston 31 is set slightly larger than the effective pressure receiving area on the primary side of the valve body 3.
The valve piped in this manner includes an upward force (valve closing direction) on the diaphragm 18 due to the secondary pressure in the pressure detection chamber 5 communicating with the secondary flow path 2b via the communication path 27, and an adjustment spring. When the downward force (opening direction) by 19 is balanced, the opening degree of the valve body 3 is controlled, and the secondary side pressure is held at a certain constant pressure lower than the primary side pressure.

Next, a second embodiment in which a part of the wafer type valve is modified will be described with reference to FIGS.
This wafer-type valve is mainly a modification of the through-passage 28 in the above-described embodiment (hereinafter referred to as the first embodiment), and other configurations are basically the same as those in the first embodiment. The same or corresponding parts are denoted by the same reference numerals in the drawing, and description thereof is omitted.
In the second embodiment, the cover flange neck 17 does not have a narrow portion as in the first embodiment, and has the same cross section in the vertical direction.
Then, on the outer side of the cover flange neck 17, the bolts on the opposite side (on the same axis as the through-passage 28 in the first embodiment) to the adjacent bolt holes at the tops of the pipe flanges F and F1 that sandwich the valve box 4 during piping. An internally threaded portion 36 for projecting a headed bolt (hexagonal bolt in the illustrated example) HB inserted through the hole is provided.

Next, a third embodiment of the wafer type valve will be described with reference to FIGS.
This wafer type valve is not a direct acting type as in the first and second embodiments but a pilot (actuating) type, and its main part is basically the same as the first embodiment. The same reference numerals are given to the same or corresponding parts in the drawings, and the description is omitted.
This wafer type pilot type valve is controlled by increasing / decreasing the power (pressure difference between the primary side pressure and the secondary side pressure) required for the operation of the valve body 3 built in the main body V by the pilot valve V1. The valve body 3 opens and closes, and the illustrated valve indicates a pilot-type pressure reducing valve. The valve body 3 provided in the main body V piped in the main pipe (pipe materials P, P1) The pressure difference valve with the secondary side pressure is used as power. A small-diameter pressure reducing valve having a force balancing mechanism is used as a pilot valve V1, and the pressure controlled through the pilot valve V1 is a drive unit of the valve body 3. 1, the valve body 3 connected to the drive unit 1 opens and closes the flow path 2 in the main body V connected to the main pipe.

The main body V controls the opening degree of the valve element 3 according to the fluctuation of the pressure fed from the pilot valve V1 to the valve box 4 provided with the flow path 2 (primary side flow path 2a and secondary side flow path 2b). The drive unit 1 is incorporated.
A cover flange neck 17 extended to the upper part of the valve box 4 is provided with a recess 16 provided with a body cover flange 14 around its upper end.

The recess 16 is opened so as to communicate with the primary flow path 2a through a space through which the pressure fluid inside the cover flange neck 17 can pass, and the lower part thereof corresponds to the valve port 9. An upper end of the partition wall 8 is formed so as to correspond to the portion 24, and a primary channel 2a and a communication path (an internal space of the cover flange neck 17) 26 continuous with the primary channel 2a in the partition wall 8; The secondary channel 2b is partitioned.
Similarly to the first embodiment, the cover flange neck 17 is penetrated through the bolts B and B1 installed adjacently between the upper portions of the pipe flanges F and F1 sandwiching the valve box 4 in the pipe state. A path 28 is provided so as to be separated from the internal space (communication path 26) of the cover flange neck 17.

The bonnet 15 has a substantially circular inverted dish shape, and a flange 15a corresponding to the body cover flange 14 is provided around the lower opening end thereof.
Then, the concave portion 16 and the bonnet 15 are joined via the diaphragm 18 and the flanges 14 and 15a are fastened by bolts (partly eyebolts), and the lower space (the concave portion 16 space) and the upper side via the diaphragm 18 The space is divided into a space (inside the bonnet 15), an adjustment spring 19 is disposed inside the bonnet 15, and the inside of the bonnet 15 is formed as a pressure chamber 5 to constitute the drive unit 1.
The adjustment spring 19 is interposed between the diaphragm retainer 20 joined to the center of the upper surface of the diaphragm 18 and the center of the upper end inside the bonnet 15.

A diaphragm receiver 30 is joined to the center of the bottom surface of the diaphragm 18, and the diaphragm receiver 30 and the diaphragm retainer 20 sandwich the top and bottom of the diaphragm 18, and a valve stem 29 is placed at the center of these three members 18, 20, 30. It is fixed and integrated.
The lower end side of the valve rod 29 penetrates and fixes the valve body 3 that opens and closes the valve port 9, and connects the valve body 3 and the drive unit 1 via the valve rod 29.
The valve body 3 is detachably provided on a valve seat 33 provided at the upper opening end of the valve port 9 so as to receive the primary pressure in the valve closing direction, and the opening degree is controlled by the displacement of the diaphragm 18. It is made up of.

The lower end of the valve stem 29 is slidably inserted into a guide tube portion 35 provided on the lower opening end side of the valve port 9, and the guide tube portion 35 has a plurality of support arms radially projecting from the outer periphery thereof. The tip of 35a is connected to the lower opening end of the valve port 9, and the gap between the adjacent support arms 35a and the valve port 9 communicate with each other to allow the flow of pressure fluid.
Further, a support cylinder 37 having a diameter smaller than that of the adjustment spring 19 and projecting vertically inside and outside the bonnet 15 is provided at the center of the upper end of the bonnet 15, and a guide hole drilled in a predetermined length above the lower end in the support cylinder 37. The flow rate adjusting rod 38 provided with 38a is screwed in an airtight manner, and the upper end of the valve rod 29 is slidably inserted into the guide hole 38a of the flow rate adjusting rod 38.
Then, the upper limit of the valve rod 29 is regulated by moving the flow rate adjusting rod 38 up and down to adjust the distance between the upper end of the valve rod 29 and the closed end of the upper portion of the guide hole 38a. The flow rate of the pressure fluid is adjusted, and the valve body 3 is forcibly fully closed by bringing the closed end of the upper portion of the guide hole 38a into contact with the upper end of the valve rod 29 by the movement of the flow rate adjusting rod 38. It is also possible to stop the primary side.

The pilot valve V1 is connected to the valve body 39 via a valve rod 40, and a diaphragm 42 that is displaced by the pressure fluctuation of the secondary side pressure chamber 41, and urges the diaphragm 42 in the valve opening direction of the valve body 39. It is a direct acting pressure reducing valve provided with a force balance mechanism 44 comprising a pressure setting spring 43.
The valve box 45 of the pilot valve V1 has a primary fluid pressure chamber 48 and a secondary pressure chamber 41 communicating with the pressure fluid inlet 46 and outlet 47 opened on the left and right (upper and lower in FIG. A partition is formed, and the primary side pressure chamber 48 and the secondary side pressure chamber 41 are communicated with the partition wall 49 via a valve port 50 that opens and closes the valve body 39, and communicates with the secondary side pressure chamber 41. A diaphragm 42 between an upper portion of the valve box 45 opened upward (left side in FIG. 10) and a spring cover 53 screwed with an adjusting screw 52 that presses the pressure setting spring 43 in the valve opening direction through a spring retainer 51. Is intervening.
Note that the configuration of the pilot valve V1 is not limited to the above as long as it has a pressure reducing function for holding the secondary side pressure at a certain constant pressure lower than the primary side pressure.

The inlet 46 of the pilot valve V1 is connected to the primary channel 2a of the main body V via the first conduit 54, and the outlet 47 of the pilot valve V1 is connected to the secondary channel 2b of the main body V. The second pipe 55 is connected.
The first pipe 54 is branched in the middle and connected to the pressure chamber 5, and a T-shaped pipe joint 56 having connection ports in three directions is piped at the branch.

In the pipe joint 56, a connection pipe 54a (hereinafter referred to as a pilot connection pipe 54a) to the pilot valve V1 and a primary side flow path 2a are respectively connected to an upper connection port and a lower connection port opened on the same axis. A connecting pipe 54b (hereinafter referred to as a primary side connecting pipe 54b) is connected, and a side connecting port orthogonal to the upper and lower connecting ports is a connecting pipe 57 (hereinafter referred to as a branch pipe 57) to the pressure chamber 5. ) Is connected (see Fig. 11).
Further, an outlet throttle port 58 and an inlet throttle port 59 smaller in diameter than each of the connecting pipes 54b and 54a are provided at the outlet of the primary side connecting pipe 54b and the inlet of the pilot connecting pipe 54a facing each other in the pipe joint 56, respectively. By adjusting the flow rate of the pressure fluid flowing into the pilot valve V1 and the pressure chamber 5 through the connecting pipe 54a and the branch pipe 57, sudden pressure fluctuations are generated in the primary pressure chamber 48 and the pressure chamber 5 of the pilot valve V1. It is made so that it does not occur.

  The valve piped in this way is controlled by a pilot valve V1 to control the pressure fed into the pressure chamber 5 of the main body V, that is, an adjustment spring for assisting valve closing by increasing the pressure in the pressure chamber 5 by the pilot valve V1. The force of 19 and the downward force on the diaphragm 18 are applied in the valve closing direction, or the pressure in the pressure chamber 5 is reduced by the pilot valve V1 so that the upward force on the diaphragm 18 due to the primary pressure is opened. The opening of the valve body 3 is controlled by balancing the downward and upward acting forces on the diaphragm 18 so that the secondary pressure is kept at a certain pressure lower than the primary pressure. To do.

  In each of the above-described embodiments, the wafer type valve is shown as a pressure reducing valve. However, it is not limited to the pressure reducing valve, but other pressure regulating valves (back pressure valve, differential pressure valve, etc.), electromagnetic valves, constant water level valves, and other valves. In the same manner as described above, the connection end portions 10 and 11 of the valve box 4 are flangeless, and the through flange 28 or the female thread portion 36 is provided in the cover flange neck 17 extending upward from the valve box 4. .

In the wafer type valve in each embodiment configured as described above, the pipe flanges F and F1 provided on the pipes P and P1 are connected to the connection end portions 10 and 11 of the valve box 4 when piping. After joining, bolts B, B1,... (Bolts B, B1,..., HB in the case of the second embodiment) are passed through the respective bolt holes of the pipe flanges F, F1.
In such a state, in the first and third embodiments, the bolts B and B1 installed adjacently between the upper portions of the pipe flanges F and F1 are respectively passed through the left and right through passages 28, and the cover flange neck 17 is connected to the cover flange neck 17. Even if it is wider than the distance between the bolts B and B1, the installation state is not hindered. Therefore, a large number of bolts B, B1,... Arranged on the circumference of the pipe flanges F, F1 are uniformly fastened with nuts N, N1. The valve (valve box 4) is fixed between the pipe materials P and P1 (pipe flanges F and F1).
Further, in the second embodiment, in the pipe flanges F and F1, the head bolt HB is screwed into the female screw portion 36 through the bolt holes adjacent to each other at the upper part, and the other bolt holes in the pipe flanges F and F1 are the first. 1. Like the third embodiment, it is fastened with nuts N, N1 ... through long screw bolts B, B1 ... and the valve (valve box 4) is fixed between the pipes P, P1 (tube flanges F, F1). Is done.

In the case of the above-described piping, in the case of the first and third embodiments, the bolts B and B1 are first inserted into the through holes 28 of the valve and the bolt holes of the pipe flanges F and F1. First, the valve (valve box 4) is connected to the pipe flanges F and F1 by screwing the headed bolts HB inserted through the adjacent bolt holes at the top of the pipe flanges F and F1 into the female threaded portion 36 of the valve. By positioning the end portions 10 and 11 on the same axis, the posture of the valve can be stably maintained, and the working efficiency of the piping can be greatly improved.
In addition, the stable mounting posture of the valve with respect to the pipe materials P and P1 (pipe flanges F and F1) can be maintained not only during piping but also during use, and the valve is displaced due to vibrations etc. occurring in the piping system during use. Nor.
In any of the above embodiments, the valve box 4 is interposed and fixed between the pipe flanges F and F1 as described above, so that the seals in the annular grooves 12 provided in the connection end portions 10 and 11 are provided. The material 13 is elastically deformed and is in close contact with the connection end surface of the pipe flanges F and F1 with the connection end parts 10 and 11, thereby sealing the connection end parts 10 and 11 and the pipe flanges F and F1.

It is a front view which shows the piping state of a wafer type valve. It is XX sectional drawing of FIG. It is a longitudinal cross-sectional view of a valve same as the above. It is a YY cross-section end view of FIG. It is a front view which shows the piping state of the wafer-type valve | bulb in a 2nd Example. It is XX sectional drawing of FIG. It is a longitudinal cross-sectional view of a valve same as the above. It is a front view which shows the piping state of the wafer-type valve | bulb in a 3rd Example. It is a top view of a valve same as the above. It is XX sectional drawing of FIG. It is a longitudinal cross-sectional view of the said valve | bulb. FIG. 12 is an end view taken along the line YY of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive part 3 Valve body 4 Valve box 6 Inlet 7 Outlet
10 Connection end
11 Connection end
12 annular groove
13 Sealing material
17 Cover flange neck
26 Interior space (communication passage)
27 Internal space (communication passage)
28 Throughway
29 Valve stem B, B1 ... Bolt F, F1 Pipe flange N, N1 ... Nut

Claims (2)

  A valve box that is sandwiched between pipe flanges fastened by bolts and nuts and that has a flangeless connection end with pipe flanges each having a pressure fluid inlet and outlet, and extends upward from the valve box In addition, a wafer-type valve having a space through which a pressure fluid can pass and a drive flange for controlling the opening degree of the valve body and a cover flange neck through which a valve rod connecting the valve body is inserted The cover flange neck is provided with a through-passage that is provided between the pipe flanges and that can be penetrated by bolts adjacent to each other on the circumference of the pipe flange from the inner space. Wafer type valve.   2. A wafer-type valve according to claim 1, wherein an annular groove is formed in a joint surface of each connection end portion with the pipe flange, and a sealing material is loaded in the annular groove.

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