JP2014114827A - Branch pipe having valve device, and method of using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a branch pipe having a valve device, and a method of using the same, capable of suppressing a fluid such as water, air or the like circulated in the branch pipe, to a predetermined very small flow rate in an initial stroke of an operation to open a pipe conduit by separating a valve element from a valve seat by operating the valve device by a worker, even when the worker is an unskilled worker who does not have advanced techniques.SOLUTION: In a branch pipe constituting a fluid pipe conduit and having a valve device, at least one of a valve element 5 and a valve seat 39 of the valve device is provided with a circulation passage S for allowing circulation of a fluid within an initial stroke range in valve opening by separating the valve element 5 from the valve seat 39.

Description

  The present invention relates to a branch pipe having a valve device applicable to repair work of a water main or the like or drawing in an extended pipe, and a method of using the branch pipe.

  Conventionally, for example, in the repair work of an existing fluid pipe in a water main buried in the ground, an uninterrupted flow construction method in which repair is performed in a state where the flow of fluid in the existing fluid pipe is maintained (discontinuous flow state) has been adopted. Yes. In such repair work, a valve device and an extension pipe are attached to an existing fluid pipe, and the flow of the existing fluid pipe to be repaired is interrupted by switching the flow path using the valve device. The existing fluid pipe without water circulation is repaired by diverting the flow of the water to the existing fluid pipe, and then the bypass extending pipe is removed. Also, in the case of extension pipe pull-in work, the branch pipe branched from the existing fluid pipe is closed using a valve device, the extension pipe is attached to the branch pipe, and the extension pipe is installed in buildings, houses, etc. After the arrangement, the branch pipe is opened to form a flow path.

  As a valve device that can be used in this way, for example, a valve seat having a size almost equal to that of a pipe line is provided, a valve body is brought into contact with the valve seat to close the pipe line, and the valve is operated by an external operation. There is one that allows the pipe to be opened by sliding the body along the valve seat (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 4-53494 (page 3, Fig. 1)

  However, in the valve device of Patent Document 1, since the valve seat is provided so as to surround the pipeline, the operator operates the valve device to release the valve body from the valve seat and open the pipeline. In the initial stroke of the operation, the pipe line is suddenly opened, and water such as water in the main water pipe and air collected in the pipe line is separated from the existing fluid pipe to the branch pipe. There is a problem that the extended pipe connected to the branch pipe is damaged by causing a sudden pressure change in the branch pipe by flowing at a flow rate. Also, in the opening operation of the branch pipe where water or air may flow, the conditions for generating water hammer due to sudden pressure changes are not uniform. A skilled worker with technology had to perform the opening operation.

  The present invention has been made paying attention to such a problem, and even if it is not a skilled worker having advanced technology, the operator operates the valve device to separate the valve body from the valve seat and to perform the pipework. To provide a branch pipe having a valve device that can keep a fluid such as water or air flowing through the branch pipe at a predetermined minute flow rate in an initial stroke in an operation for opening the path, and a method of using the branch pipe. Objective.

In order to solve the above-described problem, a branch pipe having the valve device of the present invention includes:
A branch pipe comprising a fluid pipe and having a valve device,
At least one of the valve body and the valve seat of the valve device is characterized in that a flow passage that allows fluid flow is formed within an initial stroke range when the valve is opened to separate the valve body from the valve seat. Yes.
According to this feature, fluid such as water or air is circulated by the flow passage within the initial stroke range when the valve is opened to release the valve body from the valve seat when the worker opens the blocked pipeline. As a result, a fluid with a predetermined flow rate determined in advance can be circulated to the branch portion, so that even a skilled worker having advanced technology circulates from the main pipe portion to the branch portion within the worker's initial stroke range. The fluid can be kept at a predetermined small flow rate.

A branch pipe having the valve device of the present invention,
The flow path is formed so that a cross-sectional area gradually increases toward the front side in the moving direction of the valve body.
According to this feature, the larger the stroke amount in the initial stroke range when the valve is opened, the wider the flow path to be opened, and the greater the flow rate of fluid allowed to flow. Accordingly, the flow rate flowing through the flow passage can be gradually increased to approach a predetermined flow rate.

A branch pipe having the valve device of the present invention,
The valve device has a notifying means for notifying an operator that the stroke amount has reached or reached the end point of the initial stroke range.
According to this feature, since the notification means notifies that the stroke amount has reached the end point of the initial stroke range or the vicinity thereof, the operator can distinguish the initial stroke from the main stroke.

A branch pipe having the valve device of the present invention,
The notifying means is provided in an operation portion for opening the valve that separates the valve body from the valve seat, and contacts the predetermined member when the stroke amount reaches or near the end point of the initial stroke range. Thus, the operation of the operation unit is restricted.
According to this feature, when the stroke amount reaches the end point of the initial stroke range or in the vicinity thereof, the operation of the operation unit is restricted by the notification means, so that a flow rate larger than a predetermined flow rate determined in advance by an operator's erroneous operation or the like. Therefore, it is possible to prevent the fluid from flowing through the branch portion.

A branch pipe having the valve device of the present invention,
The valve body can be rotated in any direction around a rotation axis, and the flow passage is formed symmetrically in at least one of the valve body and the valve body. .
According to this feature, the flow passage can be opened within the initial stroke range even when the valve body is rotated in any direction around the rotation axis.

The method of using the branch pipe having the valve device of the present invention is as follows.
A method of using a branch pipe having the valve device,
In a state where the branch port portion of the branch pipe is closed by the valve device, an extension pipe is connected to the branch port portion, the valve device is opened within the initial stroke range, and a predetermined flow rate is set by the flow passage. Then, the extension pipe is filled with a fluid in the fluid pipe line, and then the valve device is opened beyond the initial stroke range to open the branch port.
According to this feature, fluid such as water or air is circulated by the flow passage within the initial stroke range when the valve is opened to release the valve body from the valve seat when the worker opens the blocked pipeline. Therefore, the extension pipe can be filled with a fluid at a predetermined flow rate that is determined in advance through the branch portion, so that even a highly skilled worker can move from the main pipe portion within the initial stroke range. It is possible to switch the flow path to the branching section by keeping the fluid flowing through the branching section at a predetermined small flow rate and filling the extension pipe with the fluid.

It is a top view which shows the branch pipe which has a valve apparatus in Example 1. FIG. It is a front view which shows a branch pipe. It is a side view of the partial cross section which shows a branch pipe. (A) is a top view which shows a valve body, (b) is a front view similarly. (A) is a plane sectional view showing a case, and (b) is a front sectional view showing an AA section of (a). (A) is BB sectional drawing of FIG. 9, (b) is a plane sectional view which shows D part of (a), (c) is a sectional side view similarly. 6 is a front cross-sectional view showing a modification of the groove portion according to Embodiment 1. FIG. It is a plane sectional view for explaining the usage method of a branch pipe. (A)-(c) is a plane sectional view for explaining the procedure of opening operation of a branching part. FIG. 6 is a plan sectional view showing another modification of the groove part according to the first embodiment. (A) is a plane sectional view showing another modification of the slot concerning Example 1, and (b) is an EE sectional view of (a). (A) is a plane sectional view showing a case in Example 2, and (b) is an FF sectional view of (a). (A) is a plane sectional view showing a modification of a groove part concerning Example 2, and (b) is a GG sectional view of (a). 6 is a cross-sectional view showing a groove in Example 3. FIG. (A) is a plane sectional view showing a slot in Example 4, and (b) is a HH sectional view of (a). (A) is a plane sectional view showing a groove part, and (b) is a side sectional view showing J section of (a). (A) is a top view which shows a valve body, (b) is a front view similarly, (c) is a plane sectional view similarly.

  EMBODIMENT OF THE INVENTION The form for implementing the branch pipe which has a valve apparatus based on this invention, and its usage method is demonstrated below based on an Example.

  A branch pipe having the valve device according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the casing 3 of the branch pipe 2 having the fluid pipes 1 and 1 ′ and the valve device according to the present embodiment is made of, for example, ductile cast iron for waterworks buried in the ground, and is viewed in cross section. It is formed in a substantially circular shape, and its inner peripheral surface is covered with a mortar layer. The fluid pipe according to the present invention may be made of other metals such as cast iron and steel, or made of asbestos, concrete, vinyl chloride, polyethylene, or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe with powder coating. In this embodiment, the fluid in the fluid pipe is clean water, but is not limited to clean water in this embodiment. For example, in addition to industrial water, agricultural water, sewage, etc., gas or gas-liquid mixture of gas and liquid It does not matter.

  The fluid pipe 1 is embedded in the ground in a substantially horizontal direction to form a fluid pipe line. In the middle of the fluid pipe 1, two receiving portions 4 and 4 ′ provided so as to face each other have a valve device. A branch pipe 2 is connected. A branch pipe 2 having a valve device is incorporated in advance in a fluid pipe network of fluid pipes 1, 1 ′,... At a predetermined interval in advance, for example, two valves as shown in FIG. This is used when the work for exchanging or repairing the fluid pipes 1 ′,... Connected between the branch pipes 2 and 42 having the apparatus and the fluid equipment attached to the fluid pipes is performed in an uninterrupted state.

  As shown in FIG. 1, a branch pipe 2 having a valve device includes a housing 3 connected to the receiving ports 4 and 4 ′ to form a fluid conduit, and a valve body 5 (see FIG. 3) and an operation shaft 6 for the operator to rotate the valve body 5 mainly.

  As shown in FIGS. 1 and 2, the housing 3 is provided between the main pipe portions 7, 7 ′ communicating with the receiving ports 4, 4 ′ and the main pipe portions 7, 7 ′. , 7 ′, a valve chamber portion 8 formed in a bottomed cylindrical shape having a diameter larger than the tube diameter, a valve lid portion 9 for sealing the valve chamber portion 8 in a sealing manner, and a main pipe portion communicating with the valve chamber portion 8 7 and 7 '.

  At the ends of the main pipe portions 7 and 7 ', insertion-shaped connecting portions 11 and 11' that can be inserted into the receiving portions 4 and 4 'are formed. On the other hand, claw portions 12 and 12 ′ having sharp tips are provided at the end portions of the receiving portions 4 and 4 ′ so as to protrude from the inner peripheral surface of the receiving portions 4 and 4 ′. , 12 ′ are provided with bolts 13, 13 ′. In addition, annular groove portions 14 and 14 'are formed in the circumferential direction on the inner peripheral surfaces of the opening portions 4 and 4', and annular rubber rings 15 and 15 'are fitted into the annular groove portions 14 and 14'. . As the bolts 13 and 13 ′ are screwed in the inner diameter direction of the receiving portions 4 and 4 ′, the claw portions 12 and 12 ′ are pressed and bite into the outer peripheral wall of the main pipe portions 7 and 7 ′. The mouth portions 4, 4 'and the main pipe portions 7, 7' are in close contact with each other through the rubber rings 15, 15 ', and the receiving mouth portions 4, 4' and the main pipe portions 7, 7 'are fixed in a sealed manner. ing.

  Note that one or both of the connecting portions 11 and 11 'may be formed in a receiving shape, a flange may be formed at an end portion, or an end of a cut tube in which an end surface is formed on a cut surface. It may be formed as a part and can be appropriately set according to the connection mode on the fluid pipe side so that it can be connected to the fluid pipe network. Further, the connecting portions 11 and 11 ′ are connected to the receiving portions 4 and 4 ′ in a sealing manner by fastening with bolts and nuts using, for example, a push wheel for preventing separation and a seal member (not shown). Also good.

  Next, as shown in FIG. 3, an opening 16 for arranging the valve body 5 inside the housing 3 is formed in the upper part of the valve chamber 8. A female screw portion 17 is formed on the upper end surface of the valve chamber portion 8 surrounding the opening portion 16 at a predetermined interval in the circumferential direction. A substantially disc-shaped valve lid portion 9 is disposed above the valve chamber portion 8 with a packing member interposed therebetween, and a plurality of bolts 18 provided in the circumferential direction on the outer edge portion of the valve lid portion 9 are internally threaded. By being fastened to the portion 17, the valve lid portion 9 is fixed to the valve chamber portion 8, and the opening portion 16 is closed in a sealing manner. In addition, the fixed form of the valve chamber part 8 and the valve cover part 9 is not limited to that by the female screw part 17 and the bolt 18, for example, while forming a groove on the outer peripheral surface of the casing 3 around the opening part 16, The valve lid portion 9 may be fixed to the valve chamber portion 8 by forming a claw portion locked in the groove on the lid portion.

  Further, as shown in FIG. 3, a lid through hole 19 is provided in the center of the valve lid portion 9 so as to penetrate from the upper side to the lower side of the valve lid portion 9. An operation shaft 6 that forms a rotation shaft according to the present invention is inserted into the lid through-hole 19. And the extended piece extended in the outer-diameter direction of the valve cover part 9 in the upper surface side rather than the valve cover part 9 of the operating shaft 6 so that the direction of the rotation position of the valve body 5 inside the housing | casing 3 may always face. 20 (see FIG. 1) is provided on the operation shaft 6 so as not to rotate relative to the operation shaft 6. Further, an upper end of the operation shaft 6 is fitted with an operation rod (not shown) for rotating the operation shaft 6. A cap 21 having a prescribed shape is put on.

  The extending piece 20 may be fixed to the operation shaft 6 so as not to rotate relative to the operation shaft 6 by, for example, an adhesive or welding, or a rectangular rectangular portion is formed on a part of the operation shaft 6 and extended. An insertion hole into which the operation shaft 6 is inserted in the piece 20 is formed in a substantially square shape in plan view, and the rectangular piece and the insertion hole are engaged with each other at the corners, so that the extended piece 20 and the operation shaft 6 are connected. You may make it rotate in synchronization. Furthermore, the extended piece 20 may be extended in the opposite direction across the operation shaft 6, and in this way, the operation shaft 6 is in any direction around the rotation axis, that is, Regardless of whether it is rotated clockwise (clockwise) or counterclockwise (counterclockwise), the extended piece 20 comes into contact with a regulation pin 22 (see FIG. 2) described later, and the operation shaft 6 Can be restricted.

  Further, the extended piece 20 may be formed of an elastic body while the extended portion is formed thin in the rotating direction. As a result, when the extended portion of the extended piece 20 contacts the restriction pin 22, the operation shaft 6 is rotated to a predetermined rotation angle by the contact between the restriction pin 22 and the extended piece 20. While the operator is informed, the operator continues to contact the extension piece 20 with the restriction pin 22 to deform the extension portion made of an elastic body, so that the extension piece 20 extends beyond the restriction pin 22. Since the operation shaft 6 can be rotated, the operation shaft 6 can be easily rotated out of the predetermined rotation angle range, and the workability of the opening operation of the valve body 5 can be improved. .

  Further, on the upper surface of the valve lid portion 9, as shown in FIG. 1, four small-diameter holes 23 a having a smaller diameter than the lid through-hole 19 between the operation shaft 6 and the distal end portion of the extended piece 20 in a plan view. ˜23d are provided on the branching portion 10 side so as to be arranged in a circular arc shape with a predetermined interval. As shown in FIG. 2, a rod-shaped regulating pin 22 having a predetermined length protrudes from the upper surface of the valve lid portion 9 and is detachably inserted into the predetermined one of the small diameter holes 23a to 23d.

  The predetermined length of the restricting pin 22 is set so that the restricting pin 22 can contact the side surface of the extended piece 20, and the small-diameter hole 23 is spaced apart by a valve seat 39 (FIG. 5) described later. In the initial stroke range when the valve is released, the control pin 6 is set so that the restriction pin 22 and the extended piece 20 come into contact with each other when the operating shaft 6 is rotated at a predetermined angle by the operator. Thereby, when the operating shaft 6 is rotated by a predetermined angle by the operator, the extended piece 20 comes into contact with the restriction pin 22 and the movement of the extended piece 20 exceeding the predetermined angle is restricted. The operation shaft 6 cannot be rotated to an angle larger than a predetermined angle, and the malfunction of the valve body 5 is prevented. Since the regulation pin 22 is detachable, the regulation pin 22 can be removed by the operator so that the regulation can be released and the operation shaft 6 can be operated at an angle larger than a predetermined angle.

  Further, as shown in FIGS. 1 and 2, the branch portion 10 is formed to protrude from the outer periphery of the housing 3 in a direction substantially perpendicular to the tube axis of the main pipe portions 7 and 7 ′. A flange-like branch connection portion 24 having a diameter larger than the pipe diameter of the branch portion 10 is formed at the distal end portion. In addition, the branch connection part 24 may be formed in a receptacle shape, may be formed in an insertion shape, or may be formed as an edge part of the cut tube in which the end surface was formed in the cut surface. For example, the connection mode can be appropriately set so that connection can be made according to an extended pipe 40 (see FIG. 8) that forms a bypass path described later.

  Next, as shown in FIG. 3, the valve body 5 has a substantially U shape in a side view, and the outer surface is covered with an elastic member 25 such as rubber. In the first embodiment, since the valve body 5 is covered with the elastic member 25, the later-described seal portion 33 is configured in the valve body 5, so that the valve device can be easily manufactured.

  Further, the valve body 5 is supported by an end portion of the operation shaft 6 protruding into the valve chamber portion 8 from the valve lid portion 9 and extends substantially horizontally in the direction of the inner peripheral wall of the valve chamber portion 8; A valve portion 27 that extends downward from the base end portion of the upper support portion 26 and closes the conduit in the housing 3, and a rod-like support shaft 28 that extends substantially horizontally from the lower end of the valve portion toward the operation shaft 6. The lower support portion 29 is rotatably supported by the lower portion of the housing 3.

  As shown in FIG. 4, the upper and lower support portions 26 and 29 of the valve body 5 are both substantially fan-shaped in plan view, have a substantially disk shape at the tip portion, and penetrate vertically through the center portion. Shaft support portions 31 and 31 ′ having through holes 30 and 30 ′ are provided.

  A small-diameter insertion hole (not shown) that is formed in the inner diameter direction and communicates with the through holes 30 and 30 ′ is provided on the side peripheral surfaces of the shaft support portions 31 and 31 ′. As shown in FIG. 3, the operation shaft 6 or the support shaft 28 is inserted into the through holes 30 and 30 ′, and a rod-shaped locking pin is inserted into the insertion hole from the side peripheral surface of the shaft support portions 31 and 31 ′. 32 and 32 'are inserted, and the locking pins 32 and 32' are locked in locking holes (not shown) at the tip of the operation shaft 6 or the support shaft 28, so that the upper and lower support portions 29 is fixed to the operation shaft 6 and the support shaft 28 so as not to be relatively rotatable. Thereby, the valve body 5 is rotated in the valve chamber 8 by rotating the operation shaft 6 by the operator.

  Further, as shown in FIG. 4, the valve portion 27 has an approximately quarter arc shape in plan view, and an elastic member 25 is raised in the outer diameter direction at the outer edge portion of the outer peripheral surface. A substantially rectangular frame-shaped seal portion 33 extending at a predetermined width along the outer edge portion is formed. The seal surface 34 that is the outer peripheral surface of the seal portion 33 and faces the outer diameter direction of the valve body 5 is a valve seat surface 35 of the casing 3 described later when the operation shaft 6 is rotated by a predetermined angle by the operator. (See FIG. 5). Further, since the seal portion 33 has a predetermined width, a groove portion 36 (see FIG. 5) described later can be opened when the operation shaft 6 is rotated to a predetermined angle. Yes.

  Next, inside the valve chamber 8 of the housing 3, as shown in FIG. 5, the main tubes 7 and 7 ′ communicate with the valve chamber 8 to open the main chamber 7. The mouth portions 37 and 37 ′ are formed, and the branch port portion 38 that opens to the valve chamber portion 8 is formed by communicating the branch portion 10 with the valve chamber portion 8. The main wall ports 37, 37 ′ and the branch port portion 38 are provided on the inner peripheral wall surface of the valve chamber portion 8 so as to protrude in the center direction of the valve chamber portion 8. A substantially rectangular frame-shaped valve seat 39 is formed so as to surround the portion 38.

  The valve seat surface 35 facing the center direction of the valve chamber 8 in the valve seat 39 comes into pressure contact with the seal surface 34 of the valve body 5 when the operation shaft 6 is rotated by a predetermined angle by the operator. ing. Then, the operation shaft 6 is rotated to a predetermined angle, and the seal surface 34 and the valve seat surface 35 are pressed against each other, so that the main port port portions 37 and 37 ′ or the branch port port 38 is connected to the valve body 5. The portion 27 is hermetically closed. The valve device 8 of this embodiment is configured by the valve chamber portion 8 provided with the valve seat 39, the valve body 5 provided with the seal portion 33, the operation shaft 6, the support shaft 28, and the valve lid portion 9.

  Further, as shown in FIG. 5A and FIG. 6B, the outer peripheral edge of the valve seat 39 surrounding the branch port 38 is on the side peripheral surface of the valve seat 39 on the main pipe portion 7 side. And a groove-like groove portion 36 communicating with a part of the valve seat surface 35 is formed. In addition, as shown in FIG. 5B, the groove 36 is formed in a substantially rectangular shape having a predetermined width in the left-right direction when viewed from the side. Furthermore, the groove part 36 is formed so as to intersect the horizontal plane X passing through the tube axis of the branch part 10.

  As a result, as shown in FIGS. 6B and 6C, the valve body 5 is rotated within a predetermined angle range within the initial stroke range when the valve body 5 is released from the valve seat 39. At this time, the flow path S according to the present invention is formed by the groove 36 and the sealing surface 34 of the valve body 5. Further, by forming the sealing surface 34 on the valve body 5 side and forming the groove 36 on the valve seat 39 side, the manufacture of the valve device can be facilitated.

  Further, as shown in FIG. 6B, the groove portion 36 has an outlet opening Q on the branching portion 10 side of the flow passage S having a predetermined area when the valve body 5 is rotated at a predetermined angle. Is formed. Thereby, when the valve body 5 is rotated at a predetermined angle, the flow rate of the fluid flowing from the main pipe portions 7 and 7 ′ through the outlet opening Q to the branch portion 10 can be set to a predetermined flow rate. it can. Further, the flow rate of the fluid flowing through the branch portion 10 via the outlet opening Q can be easily adjusted by the shape of only the groove 36 on the valve seat 39 side, for example, the size of the area of the outlet opening Q. it can.

  The predetermined area of the outlet opening Q is such that the flow rate and pressure of the fluid in the main pipe parts 7 and 7 ′ and the pipe length of the extended pipe 40 (see FIG. 8) connected to the branch part 10 as will be described later. It is set according to the pipe diameter. Thereby, while being able to make the flow volume of the fluid distribute | circulated from the main pipe parts 7 and 7 'into the branch part 10 into a micro flow volume with respect to the flow volume of the fluid which flows through the main pipe parts 7 and 7', extending A very small flow rate can be set for the pipe 40.

  The groove portions 36, 36 ′ are formed in the valve seat 39 surrounding the branch port portion 38 symmetrically with respect to the tube axis of the branch portion 10. Thus, in the initial stroke range when the valve 5 is released from the valve seat 39, the groove 36 is operated even when the valve body 5 is rotated in any direction around the operation shaft 6 serving as a rotation axis. , 36 ′ are opened to form a flow passage S so that fluid can flow from the main pipe portions 7, 7 ′ to the branch portion 10.

  The grooves 36 and 36 ′ may be formed so that the area of the outlet opening Q when the valve body 5 is rotated at a predetermined angle is a predetermined area. It may be formed in the side, and may be extended long in the up-down direction. Further, the groove part 41 may be divided into a plurality of grooves 41 as shown in FIG.

  Next, a method of using the branch pipe 2 having the valve device of the first embodiment will be described with reference to FIGS. 1 and 8 to 10. In the method of using the branch pipe 2 having the valve device, first, as shown in FIG. 1, the valve body 5 is inserted into the above-described housing 3, and the housing 3 is closed in a sealing manner with the valve lid portion 9. The branch pipe 2 having the valve device of this embodiment in which the operating shaft 6 protrudes from the outer peripheral surface of the housing 3 is connected to the fluid pipes 1 ′,. As shown in FIG. 8, a branch pipe 42 having another valve device is connected to the downstream side of the branch pipe 2 having the valve device via the fluid pipes 1 ',. As shown in FIG. 8, before branching of the fluid pipe line, the branch parts 10 and 43 of the branch pipes 2 and 42 having the respective valve devices are closed by the valve bodies 5 and 44, and the main pipe parts 7 and 7. Fluid is distributed from the left side to the right side of ', 45, 45'.

  Next, as shown in FIG. 8 and FIG. 9A, an extension pipe 40 that forms a bypass path is interposed in the flange-like branch connection portions 24 and 46 of the branch portions 10 and 43 with a packing member (not shown) interposed therebetween. Connecting. The flanges 24 and 46 and the flanges of the extended pipe 40 are fastened with bolts and nuts (not shown) to fix the extended pipe 40 in a sealed manner to the branch pipes 2 and 42 having the valve device.

  In the branch pipe 2 having the upstream valve device, the operator inserts the restriction pin 22 into the leftmost small-diameter hole 23a (see FIG. 1) on the upper surface of the valve lid portion 9, while the downstream valve device. In the branch pipe 42 having a restriction pin, a restriction pin is inserted into the rightmost small diameter hole (not shown).

  Next, as shown in FIG. 9 (b), in the branch pipe 2 having the upstream valve device, the operator turns the operation shaft 6 counterclockwise so that the side surface of the extended piece 20 contacts the restriction pin 22 ( The groove 36 is opened by rotating it counterclockwise to open the flow passage S, and the extension pipe 40 is filled with the fluid in the main pipe parts 7 and 7 ′ via the branch part 10. In the present invention, the filling of the fluid does not mean that the fluid is completely filled with the fluid and the fluid is introduced until the pressure in the tube is further increased, and the fluid is filled into the empty tube after the fluid is introduced into the empty tube. It means the introduction of fluid until it is finished.

  At this time, as shown in FIG. 9B, the groove 36 on the front side in the rotational direction R of the valve body 5 is opened, and the fluid flows from the main pipe portion 7 to the branch portion 10 at a predetermined minute flow rate. On the other hand, the groove portion 36 ′ on the rear side in the moving direction R of the valve body 5 is not communicated with the branch portion 10. Thereby, a fluid flows from the front in the rotational direction of the valve body 5, and a resistance force acts on the valve body 5 in a direction opposite to the movement of the valve body 5 due to the flow of the fluid. This prevents the groove 36 from being opened.

  Then, a fluid having a predetermined minute flow rate is circulated from the main pipe portion 7 to the branch portion 10 through the flow passage S, and the fluid is generated without causing a sudden pressure change in the extended pipe 40 connected to the branch portion 10. Since it is filled, it is prevented that an impact such as a water hammer occurs in the extended pipe 40. On the other hand, in the main pipe part 7, it is prevented that a large flow rate drop or pressure drop occurs, and the flow from the upstream side to the downstream side of the main pipe part 7 is maintained. Accordingly, it is possible to prevent the extension pipe 40 from being damaged, the extension pipe 40 from being detached from the branch portion 10, and the branch connection portion 24 of the branch portion 10 from being damaged to cause fluid leakage.

  Further, at the end of the initial stroke range when the valve 5 is released from the valve seat 39, the extended piece 20 of the operation shaft 6 contacts the restriction pin 22 and the rotation of the operation shaft 6 is restricted. For example, an operator may accidentally rotate the operation shaft 6 too much, or the operation shaft 6 may be rotated for some reason while the branch portion 10 is filled with fluid such as water or air. In addition, it is possible to prevent malfunction such as fluid flowing into the branch portion 10 at a flow rate larger than a predetermined minute flow rate, and even if the worker is not a skilled worker having advanced technology, the operator can operate the operation shaft 6. It is possible to keep the fluid flowing through the branch portion 10 at a predetermined minute flow rate in the initial stroke in the operation of operating the valve body 5 away from the valve seat 39 to open the branch portion 10. Further, the extension pipe 40 can be filled with a fluid at a predetermined minute flow rate in the initial stroke in the operation of opening the branching portion 10.

  Further, after the extension pipe 40 is filled with a fluid at a predetermined minute flow rate and the extension pipe 40 is filled with the fluid, in the branch pipe 42 having a downstream valve device, an extension piece (not shown) and a regulation pin When the extension pipe 40 is connected to the branch pipes 2 and 46 by rotating the operation shaft 6 ′ clockwise (clockwise) until the two come into contact with each other and opening the groove 47 ′ on the left side of the branch part 46. The air remaining in the pipe is caused to flow to the downstream side of the fluid pipe network at a minute flow rate using the branch pipe 42 having a valve device. Thereby, the air remaining in the extended pipe 40 can be discharged preferentially to the outside of the fluid pipe network from an air valve or the like on the downstream side of the fluid pipe network (not shown). In addition, by using the branch pipe 42 having a valve device, the air can be gradually discharged from the air valve of the fluid pipe network by allowing the air to flow out into the fluid pipe network at a minute flow rate, and the valve device is provided. It is possible to prevent a large air accumulation from occurring in the fluid pipe network on the downstream side of the branch pipe 42.

  Thereafter, in the branch pipe 42 having the downstream valve device, a regulating pin (not shown) is removed and the operation shaft 6 ′ is rotated clockwise (clockwise) to open the branch section 43 while the main pipe section. The upstream side of 45 is closed with a valve body 44. Further, as shown in FIG. 9C, also in the branch pipe 2 having the upstream valve device, the control pin 22 is removed and the operation shaft 6 is rotated counterclockwise (counterclockwise) to branch. While the part 10 is opened, the downstream side of the main pipe parts 7, 7 ′ is closed with the valve body 5.

  As described above, a bypass flow path can be formed in the extended pipe 40 between the branch pipes 2 and 42 having the upstream and downstream valve devices, and the flow of the fluid pipes 1 ′,. Can be blocked. And it becomes possible to repair the fluid pipes 1 ′,.

  Note that an air valve (not shown) may be interposed in the middle of the extended pipe 40 so that the air in the extended pipe 40 may be efficiently discharged to the outside, and thereby, a branch having a downstream valve device. The operation | work which flows the air which remained in the pipe | tube at the time of the connection of the extended piping 40 to the downstream of a fluid pipe network using the pipe | tube 42 can be abbreviate | omitted. Further, after repairing the fluid pipes 1 ′,... Without fluid flow, the upstream and downstream valve devices are operated to rotate the valve bodies 5, 44 in the direction of closing the branch portions 10, 43. Thus, the flow path can be returned to the fluid pipes 1 ′, and the extended pipe 40 can be removed from the branch parts 10 and 43.

  Furthermore, as shown in FIG. 10, in the casing 3 of the branch pipe 2 having the valve device, the main pipe parts 7, 7 ′ are symmetrical with respect to the pipe axis of the main pipe parts 7, 7 ′. The groove portion 48, 48 'is also formed inside the valve seat 39 that surrounds the main pipe portion even when the flow passage is returned to the fluid pipe 1', ... after repairing the fluid pipe 1 ', .... In the initial stroke in the operation of opening 7, 7 ', the fluid can be circulated from the branch part 10 to the main pipe parts 7, 7' at a predetermined minute flow rate, and the fluid pipes 1 ',. The fluid pipes 1 ′,... Can be filled with fluid without causing a pressure change.

  Furthermore, in the above-described first embodiment, in the branch pipe 2 having the upstream valve device, the operator rotates the operation shaft 6 to open the groove portion 36, and the fluid in the main pipe portions 7 and 7 '. Is filled in the extended pipe 40 at a very small flow rate, and then the air remaining in the extended pipe 40 is transferred to the downstream side of the fluid pipe network at a very small flow rate by using the branch pipe 42 having a valve device on the downstream side. However, the method of using the branch pipe having the valve device according to the present invention is not limited to this procedure. For example, in the branch pipe 42 having the downstream valve device, the operator can connect the branch portion 46. By opening the left-side groove 47 ', the air remaining in the extension pipe 40 flows to the downstream side of the fluid pipe network at a minute flow rate using the branch pipe 42 having the downstream valve device. In this state, the groove 36 is opened in the branch pipe 2 having the upstream valve device. It may be filled in extending 設配 tube 40 the fluid mains 7, 7 'a minute flow rate to. Thereby, it is possible to discharge the residual air through the air valve of the downstream fluid pipe network while filling the extension pipe 40 with the fluid, and to improve the workability of the residual air discharge operation.

  Next, still another modification of the branch pipe 2 having the valve device according to the first embodiment will be described with reference to FIG. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted. In the present modification, the valve body 5 similar to that in the first embodiment is disposed in the housing 49, but the formation positions of the grooves 50 and 50 'in the valve seat 39 are different from those in the first embodiment.

  As shown in FIG. 11, a valve seat 39 that protrudes in the inner circumferential direction of the housing 49 is formed around the branch port portion 38 formed on the inner peripheral surface of the housing 49 so as to surround the branch port portion 38. Has been. Further, on the inner edge of the valve seat 39, a groove-like groove portion that communicates with the inner side of the valve seat 39, that is, the side peripheral surface on the branch port portion 38 side and a part of the valve seat surface 35. 50, 50 'are formed. The groove portions 50, 50 ′ are formed symmetrically with respect to the tube axis of the branch portion 51. Further, as shown in FIG. 11B, the groove portions 50 and 50 'are formed in a substantially rectangular shape having a predetermined width in the left-right direction in a side view. Furthermore, the groove part 36 is formed so as to intersect with a horizontal plane Y passing through the tube axis of the branch part 10.

  Thereby, for example, in the initial stroke when the operator opens the branch portion 51 by turning counterclockwise, the groove portion 50 ′ on the rear side in the rotation direction R of the valve body 5 (not shown) is opened, and the main pipe portion While the fluid flows from 52 and 52 ′ to the branch portion 51, the groove portion 50 on the front side in the rotational direction of the valve body 5 does not communicate with the branch portion 10. When the valve body 5 is operated at a predetermined angle as in the first embodiment, the flow path S is formed by the grooves 50 and 50 ′ and the seal surface 34 of the valve body 5. , 52 ′ can be filled with a fluid at a predetermined minute flow rate.

  Note that the groove portions 36 and 36 ′ of the first embodiment and the groove portions 50 and 50 ′ of the present modification may be formed together in the valve seat 39. Thereby, in the usage method of the branch pipe 2 having the valve device of the first embodiment, when the fluid pipes 1 ′,... Without fluid flow are repaired and the flow paths are returned to the fluid pipes 1 ′,. Even when the closed main pipe part is opened, the fluid can be circulated at a predetermined minute flow rate from the branch part to the main pipe part.

  Next, the branch pipe 53 having the valve device according to the second embodiment will be described with reference to FIG. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted. In the branch pipe 53 having the valve device of the second embodiment, the valve body 5 similar to that of the first embodiment is disposed in the housing 54, but the shape of the valve seat 39 is different from that of the first embodiment.

  As shown in FIG. 12, inside the valve chamber portion 55 of the housing 54, the main port portion 37 that opens to the valve chamber portion 55 when the main tube portions 56, 56 ′ communicate with the valve chamber portion 55. , 37 ′ are formed, and the branch port portion 38 that opens to the valve chamber portion 55 is formed by communicating the branch portion 57 with the valve chamber portion 55. The main wall ports 37, 37 ′ and the branch port 38 around the inner wall surface of the valve chamber 55 are raised in the center direction of the valve chamber 55, and the main ports 37, 37 ′ and the branch port. A substantially annular valve seat 58 is formed so as to surround the portion 38.

  Further, as shown in FIG. 12 (a), on the outer side edge of the valve seat 58 surrounding the branch port portion 38, the side peripheral surface on the main pipe portion 56 side of the valve seat 58 and the valve seat surface 59, Groove-shaped groove portions 60, 60 ′ communicating with a part of 59 ′ are formed. Further, as shown in FIG. 12B, the groove portions 60, 60 'are formed in a substantially rectangular shape having a predetermined width in the left-right direction in a side view. Further, the groove portions 60 and 60 ′ are formed so as to intersect with the horizontal plane Y passing through the tube axis of the branch portion 57. As a result, when the valve body 5 is rotated within a predetermined angle range within the initial stroke range when the valve body 5 is released from the valve seat 58, the seal between the groove portions 60, 60 ′ and the valve body 5 is achieved. The flow path S according to the present invention is formed by the surface 34. Since these flow passages S are formed on the valve seat 58 side, a flow path for minute flow rate that can separate and discharge water, air, and the like is more easily formed than on the valve body 5 side. be able to.

  Accordingly, as in FIG. 9B of the first embodiment described above, for example, in the initial stroke when the operator opens the branch portion 57 by left rotation, the valve body 5 is moved forward in the rotation direction R. The groove 60 on the side is opened and fluid flows from the main pipes 56 and 56 ′ to the branch 57 at a predetermined minute flow rate, while the groove 60 ′ on the rear side in the moving direction R of the valve body 5 is the branch. No communication with 57. In addition, a fluid flows from the front in the rotational direction of the valve body 5, and a resistance force acts on the valve body 5 in a direction that opposes the movement of the valve body 5 by the flow of the fluid. This prevents the groove 60 from being opened.

  In addition, a fluid having a predetermined minute flow rate is circulated from the main pipe portions 56 and 56 ′ to the branch portion 57 through the flow passage S formed by the groove portions 60 and 60 ′ and the seal surface 34. It is possible to prevent a shock such as a water hammer from being filled in the extended pipe 40 without being subjected to a rapid pressure change in the extended pipe 40. On the other hand, in the main pipe portions 56 and 56 ′, the flow from the upstream side to the downstream side of the main pipe portions 56 and 56 ′ is maintained without causing a large decrease in flow rate or pressure.

  Next, a modification of the branch pipe 53 having the valve device according to the second embodiment will be described with reference to FIG. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted. In the branch pipe 61 having the valve device of this modification, the valve body 5 similar to that of the above-described second embodiment is disposed in the housing 62, but the formation position of the groove 63 in the valve seat 58 is different.

  As shown in FIG. 13, a substantially annular valve seat 58 that protrudes in the inner peripheral direction of the housing 62 so as to surround the branching port portion 38 around the branch port portion 38 formed on the inner periphery of the housing 62. Is formed. Further, on the inner edge of the valve seat 58, a groove-like groove portion communicating with the inner side of the valve seat 58, that is, the side peripheral surface on the branch port portion 38 side and a part of the valve seat surface 59. 65, 65 ′ are formed. The groove portions 65 and 65 ′ are formed symmetrically with respect to the tube axis of the branch portion 64. Further, as shown in FIG. 11B, the groove portions 65, 65 'are formed in a substantially rectangular shape having a predetermined width in the left-right direction in a side view. Furthermore, the groove part 36 is formed so as to intersect with a horizontal plane Y passing through the tube axis of the branch part 10.

  Thereby, for example, in the initial stroke when the operator turns the branch portion 64 by turning counterclockwise, the groove portion 65 ′ on the rear side in the rotation direction R of the valve body 5 (not shown) is opened, and the main pipe portion While the fluid flows from 66 and 66 ′ to the branching portion 64, the groove portion 65 on the front side in the rotational direction of the valve body 5 does not communicate with the branching portion 64. Then, when the valve body 5 is operated at a predetermined angle as in the first embodiment, the flow path S is formed by the grooves 65 and 65 ′ and the seal surface 34 of the valve body 5. , 66 ′, the branch portion 64 can be filled with a fluid at a predetermined minute flow rate.

  It should be noted that the groove portions 60 and 60 ′ of the second embodiment and the groove portions 66 and 66 ′ of the present modification may be formed together on the valve seat 58. As a result, in the above-described first embodiment, when the fluid pipes 1 ′,... Without fluid flow are repaired and the flow paths are returned to the fluid pipes 1 ′,. Even when the valve is opened, the fluid can be circulated at a predetermined minute flow rate from the branch portion 64 to the main pipe portions 66 and 66 ′.

  Next, a branch pipe having the valve device according to the third embodiment will be described with reference to FIG. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted. In the branch pipe having the valve device of the third embodiment, the valve body 5 similar to the first and second embodiments described above is disposed in the housing 67, but the shape of the groove 68 in the valve seat is different. .

  As shown in FIG. 14, a substantially rectangular frame-shaped valve that protrudes in the inner peripheral direction of the casing 67 so as to surround the branch opening 38 around the branch opening 38 formed on the inner periphery of the casing 67. A seat 70 is formed. Further, the outer edge of the valve seat 70 has a groove-like shape communicating with the outer side of the valve seat 70, that is, the side peripheral surface on the main pipe port 37 side and a part of the valve seat surface 59. A plurality of grooves 68 are formed side by side in the vertical direction. The groove 68 is formed so that the vertical width gradually increases from the center of the valve seat 70 toward the outside in a side view.

  Thus, when the valve body 5 (not shown) is rotated so as to open the branch port portion 38 and close the main tube port portions 37 and 37 ′, the valve body 5 is directed toward the front side in the rotation direction. The cross-sectional area of the groove 68 and the outlet opening Q on the branch port 69 side of the flow passage S are gradually increased. The larger the stroke amount in the initial stroke range when the valve is opened, the more the flow passage is opened. Since S increases and the flow rate of the fluid allowed to flow through the flow passage S increases, the flow rate flowing through the flow passage S is gradually increased according to the stroke amount so as to approach the predetermined flow rate even within the initial stroke range. Can do. Therefore, the flow rate that starts to flow from the main pipe portions 37 and 37 ′ to the branch port portion 38 when the valve is opened can be kept at a much smaller flow rate.

  Further, by forming the groove portion 68 on the valve seat 70 side, it is possible to make the manufacture of the valve device easier than forming the groove portion 68 on the valve body 5 side. Further, since the groove 68 is not deformed by forming the groove 68 on the valve seat 70 side, it is easier to form a more accurate flow passage S than that formed on the elastic member 25 or the like on the valve body 5 side. Thus, the flow rate flowing through the flow passage S can be set to a predetermined flow rate.

  Next, the branch pipe 71 having the valve device according to the fourth embodiment will be described with reference to FIGS. 15 to 18. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted. The branch pipe 71 having the valve device according to the fourth embodiment is different from the first to third embodiments in that grooves 89 and 89 'are formed in the valve body 73 as shown in FIG.

  As shown in FIG. 15, a main port port portion 77 that opens to the valve chamber portion 75 by connecting main tube portions 76, 76 ′ to the valve chamber portion 75 inside the valve chamber portion 75 of the housing 74. , 77 ′, and a branch port portion 79 that opens to the valve chamber portion 75 is formed by communicating the branch portion 78 with the valve chamber portion 75. Further, the main wall port portions 77 and 77 ′ and the branch port portion 79 are protruded on the inner peripheral wall surface of the valve chamber portion 75 in the center direction of the valve chamber portion 75, and the main port port portions 77 and 77 ′ and the branch port. A substantially rectangular frame-shaped valve seat 80 is formed so as to surround the portion 79.

  As shown in FIG. 17, the valve body 73 includes a pair of upper and lower upper and lower support portions 82 and 83 that are substantially fan-shaped in a plan view, and a valve portion 84 that closes the conduit of the housing 74. The valve body 73 is substantially U-shaped in a side view, and an elastic member 85 is raised in the outer diameter direction on the outer edge portion of the outer peripheral surface of the valve body 73 and is predetermined along the outer edge portion. A substantially rectangular frame-shaped seal portion 86 extending in the width is formed. The seal surface 87 that is the outer peripheral surface of the seal portion 86 and faces the outer diameter direction of the valve body 73 is pressed against the valve seat surface 80 of the housing 74 when the operation shaft 6 is rotated by a predetermined angle by the operator. It has come to be. The valve device 73 according to the fourth embodiment is configured by the valve body 73 provided with the seal portion, the valve chamber portion 75 provided with the valve seat 80, the operation shaft 6, the support shaft 28, and the valve lid portion 9.

  Then, on the left and right inner edges of the seal portion 86 of the valve body 73, as shown in FIG. 17, groove-shaped grooves 89 and 89 communicating from the inner surface of the seal portion 86 to the inner edge of the seal surface 87. 'Is formed. The groove portions 89 and 89 'are formed in a substantially rectangular shape having a predetermined width in the vertical and horizontal directions when viewed from the side. As shown in FIG. 16, the grooves 89 and 89 ′ allow the operator to operate the operation shaft 6 to release the valve body 73 from the valve seat 80 and open the branch portion 78. When the body 73 is rotated within a predetermined angle range, the flow path S according to the present invention is formed by the groove portions 89 and 89 ′ and the valve seat surface 90 of the valve seat 80.

  As a result, similar to the flow path S of the first embodiment described above, the groove portion 89 on the front side in the rotational direction R of the valve body 73 is opened in the initial stroke when the operator opens the branch portion 78. Thus, a fluid such as water or air can be circulated from the main pipe portions 76 and 76 ′ to the branch portion 78 at a predetermined minute flow rate.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the said Example, although it has comprised so that one branch part 10 may be branched from the main pipe parts 7 and 7 'of the branch pipe 2 which has a valve apparatus, the branch part 10 is not restricted to one, For example, two branch portions may be branched from the main portion with the tube axis of the housing 3 interposed therebetween, or two or more branch portions may be branched from the main portion.

1, 1 'Fluid pipe 2, 2', 42 Branch pipe 3, 49, 54 Housing 5, 44, 73 Valve body 6, 6 'Operating shaft 7, 7' Main pipe section 8, 55 Valve chamber section 9 Valve lid Portions 10, 43, 51 Branch portion 16 Opening portion 20 Extension piece 21 Cap 22 Restriction pin 23 Small-diameter holes 24, 46 Branch connection portion 25, 85 Elastic member 27, 84 Valve portion 32 Locking pin 33, 86 Seal portion 34, 87 Seal surface 35, 59, 90 Valve seat surface 36 Groove portion 37, 37 'Main port portion 38, 69, 79 Branch port portion 39, 58 Valve seat 40 Extended piping 41, 47, 48 Groove portion 50, 60, 63 Groove portion 52, 52 ′ Main pipe part 53, 61 Branch pipe 56, 56 ′ Main pipe part 57, 64, 78 Branch part 62, 68, 74 Housing 65, 72 Groove part 66, 66 ′ Main pipe part 67, 71 Branch pipe 70 , 80 Valve seat 75 Valve chamber part 76 Main pipe part 77 Main pipe port part

Claims (6)

A branch pipe comprising a fluid pipe and having a valve device,
At least one of the valve body and the valve seat of the valve device is formed with a flow passage that allows a fluid to flow within an initial stroke range when the valve is opened to separate the valve body from the valve seat. A branch pipe having a valve device to perform.   The branch pipe having the valve device according to claim 1, wherein the flow passage is formed so that a cross-sectional area gradually increases toward a front side in a moving direction of the valve body.   3. The branch pipe having the valve device according to claim 1, wherein the valve device has notification means for notifying an operator that the stroke amount has reached or reached the end point of the initial stroke range. .   The notifying means is provided in an operation portion for opening the valve that separates the valve body from the valve seat, and contacts the predetermined member when the stroke amount reaches or near the end point of the initial stroke range. The branch pipe having a valve device according to any one of claims 1 to 3, wherein the operation at the operation portion is restricted by the operation.   The valve body is rotatable in any direction around a rotation axis, and the flow passage is formed symmetrically in at least one of the valve body and the valve body. A branch pipe having the valve device according to any one of claims 1 to 4. A method of using a branch pipe having the valve device,
In a state where the branch port portion of the branch pipe is closed by the valve device, an extension pipe is connected to the branch port portion, the valve device is opened within the initial stroke range, and a predetermined flow rate is set by the flow passage. 2. The extension pipe is filled with a fluid in the fluid pipe line, and then the valve device is opened beyond the initial stroke range to open the branch port portion. Use method of the branch pipe which has the valve apparatus in any one of thru | or 5.

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