JP2009201888A - Pressure reducing valve with water shut off function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure reducing valve with a water shut off function, which securely allows pressure reducing action for a long time with water shut off. <P>SOLUTION: A primary water flow channel A1 from an inflow port 11 to a valve port 14, and a secondary water flow channel A2 from the valve port 14 to an outflow port 12 are formed in a valve casing 2 of the pressure reducing valve 1 with the water shut off function. A cylinder chamber 16 is formed on the periphery side of the primary water flow channel A1 so as to accommodate the sliding member 31 of a slider 3 and a coil spring 5. A pressure receiving member 4 fixed on the tip end of the rod member 32 of the slider 3 is arranged in the secondary water flow channel A2. A valve body 6 that has a through-hole 63 to be inserted into the rod member 32 of the slider 3 and is movable toward an approaching/receding direction of a valve sheet 15 between the pressure receiving member 4 and the valve sheet 15. Closing an operation handle 72 applies a pressure force to the valve body 6 from a valve axis 71 through a valve body connection member 73, and allows the valve body 6 to close the valve port 14 so as to shut off the water. A compressive force is not applied to the coil spring 5 while the water is shut off, which prevents deterioration of the coil spring 5 for the long time with the water shut off. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pressure reducing valve with a water stop function used for a fire hydrant device, for example.

  In the fire hydrant device, a fire hose is connected to the water supply pipe via a gate valve, the fire hose is extended at the time of fire extinguishing, the water discharge nozzle at the tip thereof is directed to the fire extinguishing point, and the gate valve is opened to discharge water. . However, when the water pressure of the water supply pipe is high as in a high-rise building, if the water pressure is applied to the hose as it is, the hose becomes stiff and difficult to handle, or a large reaction force is given to the operator of the water discharge nozzle. There is.

  In order to prevent such inconvenience, in the fire hydrant device, a pressure reducing valve is provided on the upstream side or downstream side of the gate valve, and the pressure from the water supply pipe is reduced by this pressure reducing valve and sent to the hose. As a pressure reducing valve used for a fire hydrant device, there is a pressure reducing valve with a water stopping function which has a water stopping function and also functions as a gate valve.

  Conventionally, there exists a thing as shown in FIG. 4 as a pressure-reduction valve with a water stop function (for example, refer patent document 1). This pressure reducing valve with a water stop function is connected to the valve body 533 that opens and closes the valve port 532 that connects the inflow port 530 and the outflow port 531, and is located below the valve port 532 and communicates with the outflow port 531 through the communication path 540. A cylinder chamber 534, a piston 535 accommodated in the cylinder chamber 534, a stem 536 connecting the piston 535 and the valve body 533, and an upper end of the stem 536 are slidably connected to each other. A deadline shaft 538 that moves up and down by a rotation operation to position the upper end position of the stem 536 is provided. The piston 535 is biased upward by a coil spring 539 accommodated in the lower portion of the cylinder chamber 534.

When the handle 537 is operated and the closing shaft 538 is set to the lowest position, the valve body 533 closes the valve port 532 and enters the water stop state. On the other hand, when the handle 537 is operated and the closing shaft 538 is set to a predetermined position above the lowest position, the stem 536, the valve body 533, and the piston 535 can move in the vertical direction with this position as the upper limit. Here, when the water pressure on the outlet 531 side is high, the piston 535 is driven downward against the biasing force of the coil spring 539, the valve body 533 approaches the valve port 532, and the water from the inlet 530 to the outlet 531 is driven. This causes the downstream water pressure to be lower than the upstream water pressure. In this way, the pressure reducing operation is performed, and water of a predetermined low pressure is supplied to the hose connected to the outflow port 531.
JP 2006-95150 A

  However, when the conventional pressure reducing valve with a water stop function is used in a fire plug device, the opportunity to perform the pressure reducing operation is limited to a fire or inspection, and the water stop state continues for a long period of time. Therefore, since the compressed state of the coil spring 539 is continued, there is a possibility that the coil spring 539 may be deteriorated, and there is a problem that a malfunction may occur when a pressure reducing operation is required due to a fire or the like.

  Then, the subject of this invention is providing the pressure-reduction valve with a water stop function which can perform pressure reduction operation reliably, even if it continues a water stop state for a long time.

  In order to solve the above problems, the pressure reducing valve with a water stop function of the present invention has a flow channel between the inlet and the outlet, and a valve port and a valve seat are formed in the middle of the flow channel. A valve box in which a primary flow channel is formed on the upstream side of the valve and a secondary flow channel formed on the downstream side of the valve port, a slider movably disposed on the primary flow channel side of the valve box, A pressure receiving member fixed to the downstream end of the slider and having a pressure receiving surface located in the secondary flow channel of the valve box and receiving the water pressure of the secondary flow channel, and interposed between the valve box and the slider; An urging member for urging the slider in a direction in which the pressure receiving member moves away from the valve seat; a valve body movably disposed between the valve seat and the pressure receiving member in the secondary flow channel of the valve box; The valve body is provided with an opening / closing part that switches between a valve-closed state in which the valve body is in contact with the valve seat and a valve-opened state in which the valve body is separated from the valve seat. To have.

  According to the said structure, when a valve body is a valve opening state, pressure reduction operation | movement is performed. That is, when the water pressure in the secondary flow channel rises, the force acting on the pressure receiving member increases, whereby the pressure receiving member moves the valve body to the valve seat side against the urging force of the urging member acting via the slider. To drive. As a result, the flow rate of water from the primary flow channel to the secondary flow channel decreases, and the water pressure in the secondary flow channel decreases. On the other hand, when the valve body is in a closed state, the valve body contacts the valve seat and closes the valve port, whereby the flow of water from the primary flow path to the secondary flow path is cut off and the water stop state is entered. . Here, the valve body is movably disposed between the valve seat and the pressure receiving member, and the valve body is operated by the opening / closing portion to come into contact with the valve seat to be in a closed state. Even in the state, no compressive force acts on the urging member. Therefore, even if the water stop state is continued for a long time, the urging member is hardly deteriorated. As a result, the pressure reducing valve with a water stop function can normally perform the pressure reducing operation even if the pressure reducing operation is performed after the water stopped state continues for a long time.

  In the pressure reducing valve with a water stop function of one embodiment, the slider has a bar member extending on the central axis of the valve body and having a tip fixed to the pressure receiving member, and the pressure receiving member is offset from the central axis. The valve body has a guide hole that is inserted through the rod member of the slider and guided in the valve seat contact / separation direction, and the opening / closing portion is inserted through the through hole of the pressure receiving member. A valve body connecting member having a rod-shaped portion whose one end is fixed to the valve body, and an engaging portion that extends to the other end of the rod-shaped portion and extends on the central axis of the valve body and projects to the opposite side of the valve body A shaft portion screwed into the valve box and disposed on the central axis of the valve body, the tip of which engages with the engagement portion of the valve body connection member, and a handle that rotates the shaft portion to advance and retract in the axial direction. Part.

  According to the above embodiment, the valve body can be switched between the valve-closed state and the valve-opened state via the valve-body connecting member by moving the shaft portion in the axial direction by operating the handle portion. Here, the rod member of the slider connected to the urging member is inserted through the guide hole of the valve body, and the urging member and the valve body are separated from each other, so that the urging member is compressed to the valve body closed state. Can be avoided.

  In the pressure reducing valve with a water stop function of one embodiment, the slider is disposed at a position parallel to the center axis of the valve body and offset from the center axis of the valve body, and has a rod member whose tip is fixed to the pressure receiving member, The pressure receiving member has a through hole formed on the central axis, the valve body has a guide hole that is inserted in the rod member of the slider and guided in the valve seat contact and separation direction, and the opening / closing part is a valve box And a shaft portion which is disposed on the central axis of the valve body and is inserted into the through hole of the pressure receiving member and whose tip abuts on the valve body, and a handle portion which rotates the shaft portion to advance and retreat in the axial direction. Have

  According to the said embodiment, a valve body can be switched to a valve closing state and a valve opening state by advancing and retracting a shaft part to an axial direction by operation of a handle part. Here, the rod member of the slider connected to the urging member is inserted through the guide hole of the valve body, and the urging member and the valve body are separated from each other, so that the urging member is compressed to the valve body closed state. Can be avoided.

  According to the pressure reducing valve with a water stop function of the present invention, the valve body is movably disposed between the valve seat and the pressure receiving member, the valve body is operated by the opening / closing portion, and the valve body is in contact with the valve seat. Since the valve body is switched to the valve open state away from the valve seat, the compression force is applied to the biasing member connected to the pressure receiving member via the slider even in the valve closed state. Therefore, even if the water stop state is continued for a long time, deterioration of the urging member can be prevented. As a result, even if the decompression operation is performed after the water stop state continues for a long time, the decompression operation can be normally performed.

  FIG. 1 is a sectional view showing a pressure reducing valve with a water stop function as an embodiment of the present invention. The pressure reducing valve 1 with a water stop function includes a valve box 2, a slider 3, a pressure receiving member 4, a coil spring 5 as an urging member, a valve body 6, and an opening / closing part 7.

  The valve box 2 has a substantially cylindrical shape in which a substantially central portion in the axial direction swells, and an inflow port 11 is formed at a lower end, while an outflow port 12 is formed on a side surface. A flow path is formed between the inflow port 11 and the outflow port 12, and a valve port 14 is formed at a position where a central axis passing through the inflow port 11 and a central axis passing through the outflow port 12 intersect. A primary flow channel A1 is formed between the inlet 11 and the valve port 14, while a secondary flow channel A2 is formed between the valve port 14 and the outlet 12. The direction of the water flowing through the primary flow channel A1 and the secondary flow channel A2 is substantially perpendicular to each other. A valve seat 15 to which the valve body 6 contacts and separates is formed at the edge of the valve port 14 on the secondary flow channel A2 side.

  A substantially conical cap 21 is fixed to the upper end of the valve box 2, a valve shaft 71 is disposed on the central axis of the cap 21, and an operation handle 72 is fixed to the upper end of the valve shaft 71. The valve shaft 71 is screwed into the cap 21, and is configured to advance and retract the valve shaft 71 in the axial direction by rotating the operation handle 72.

  A substantially cylindrical annular cylinder chamber 16 is formed on the outer peripheral side of the primary flow channel A1 in the valve box 1, and the lower portion of the slider 3 is slidably fitted in the cylinder chamber 16.

  FIG. 2 is an exploded perspective view showing the slider 3, the pressure receiving member 4, the valve body 6, and the opening / closing part 7. As shown in FIGS. 1 and 2, the slider 3 includes a generally cylindrical sliding member 31 and a bar member 32 integrally formed on the upper side of the sliding member 31. The sliding member 31 is accommodated in the cylinder chamber 16, while the rod member 32 has a tip connected to the pressure receiving member 4. The end of the sliding member 31 on the side of the rod member 32 is formed with a large diameter, and an outer O-ring 33 is provided on the outer peripheral surface of the sliding member 31 to seal between the outer diameter side wall of the cylinder chamber 16. . The other end of the sliding member 31 is formed with a small diameter, and an inner O-ring 34 is provided on the inner peripheral surface thereof to seal the space between the inner diameter side wall of the cylinder chamber 16. The coil spring 5 is accommodated between the outer peripheral surface of the other end of the sliding member 31 and the inner peripheral surface on the outer diameter side of the cylinder chamber 16. A primary water channel A1 is formed inside the sliding member 31, and the rod member 32 is integrally formed along the central axis at the center of the radial member 35 formed integrally with the upper end of the sliding member 31. Is formed.

  The pressure receiving member 4 is formed in a disk shape with a central portion of the upper side surface bulging into a truncated cone shape, and a rod member 32 is screwed into a screw hole 41 formed along the central axis. A rod-shaped part 73a of the opening / closing part 7 described later is inserted into two through holes 42, 42 formed on the same diameter by offset. The upper side surface of the pressure receiving member 4 is a pressure receiving surface, while the lower side surface of the pressure receiving member 4 is formed on a contact surface with the upper side surface of the valve body 6.

  The valve body 6 is formed in a flat disk shape, and is disposed between the valve seat and the pressure receiving member 4. The valve body 6 includes a metal valve main body 61 and a rubber packing 62 provided on a surface of the valve main body 61 on the valve seat 15 side. The valve element 6 has a rod member 32 of a slider inserted through a through-hole 63 formed on the central axis, and is movable between the valve seat 15 and the pressure receiving member 4 by being guided by the rod member 32. ing.

  The opening / closing part 7 is substantially engageable with a valve shaft 71 as a shaft part screwed into the cap 21, an operation handle 72 as a handle part fixed to the upper end of the valve shaft 71, and a lower end of the valve shaft 71. And an inverted Y-shaped valve body connecting member 73. The valve body connecting member 73 has rod-like portions 73a and 73a that are respectively inserted into the two through holes 42 and 42 of the pressure receiving member 4, and the lower ends of the rod-like portions 73a and 73a are fixed to the upper surface of the valve body 6. Yes. The rod-like parts 73a and 73a are formed in parallel with the central axis of the valve body 6, and the upper ends thereof are connected to each other by a generally arcuate connection part 73b. An engaging portion 73c that protrudes on the opposite side of the valve body 6 along the central axis of the valve body 6 is integrally formed at the center upper portion of the connection portion 73b. The engaging portion 73 c of the valve body connecting member 73 is accommodated in a bottomed hole 71 a formed in the lower end surface of the valve shaft 71 and engages with the valve shaft 71.

  The pressure reducing valve 1 with the water stop function configured as described above operates as follows.

  When the operation handle 72 is operated and the valve shaft 71 is driven upward while the valve body 6 is closed with the valve port 14 closed, the valve body 6 is pushed up by the water pressure of the primary flow channel A1, and the valve body The valve body 6 moves away from the valve seat 15 until the engagement portion 73c of the connection member 73 engages with the valve shaft 71, and the valve is opened. Water having a flow rate corresponding to the separation distance between the valve body 6 and the valve seat 15 flows from the primary flow channel A1 through the valve port 14 to the secondary flow channel A2. Here, when the water pressure P2 in the secondary flow channel A2 exceeds a predetermined reference value, the force acting on the pressure receiving surface of the pressure receiving member 4 increases, whereby the pressure receiving member 4 acts via the slider 3. The valve element 6 is driven toward the valve seat 15 against the urging force of the coil spring 5. As a result, the flow rate of water from the primary flow channel A1 to the secondary flow channel A2 decreases, and the water pressure P2 in the secondary flow channel A2 decreases. The valve body 6 is adjusted to a position where the water pressure P1 of the primary flow channel A1, the water pressure P2 of the secondary flow channel A2 and the urging force of the coil spring 5 are balanced, whereby the water pressure P2 of the secondary flow channel A2 is a predetermined value. It is adjusted to the reference value. In this way, the pressure reducing valve 1 with a water stop function performs a pressure reducing operation.

  On the other hand, when the operation handle 72 is operated and the valve shaft 71 is driven downward with the valve body 6 opened, the engaging portion 73c of the valve body connecting member 73 is inserted into the bottomed hole 71a of the valve shaft 71. Engage and a downward force is applied from the valve shaft 71 to the valve body connecting member 73, whereby the valve body 6 is driven toward the valve seat 15. When the valve body 6 comes into close contact with the valve seat 15, the valve port 14 is closed, the flow of water from the primary flow channel A1 to the secondary flow channel A2 is stopped, and the pressure reducing valve 1 with a water stop function is in a water stop state. Become.

  When this pressure-reduction valve 1 with a water stop function is used for a fire plug device, the water stop state is continued for a long period of time. Here, the valve body 6 is given a pressing force from the valve shaft 71 to the valve seat 15 via the valve body connecting member 73. At this time, the slider 3 and the pressure receiving member 4 connected to the coil spring 5 The force accompanying the pressing of the valve body 6 does not act. Therefore, since the coil spring 5 is held in a free state where it does not receive a compressive force, the coil spring 5 does not deteriorate even if the water stop state continues for a long period of time. Therefore, even if the valve body 6 is opened due to a fire or the like after the water stop state has continued for a long period of time, the pressure reducing operation can be normally performed without causing malfunction.

  Further, when the water pressure P2 in the secondary flow channel A2 is below the reference value and the pressure reducing valve 1 with the water stop function does not perform the pressure reducing operation, the water from the primary flow channel A1 is supplied to the valve body 6 and the valve body connecting member. Only by moving 73 upward, it flows into the secondary flow channel A2 with less pressure loss than in the past. In a conventional pressure reducing valve with a water stop function, a valve body is formed integrally with a stem and a piston and is urged by a coil spring. Therefore, even when the pressure reducing operation is not performed, it is necessary to hold the valve body on the open side against the urging force of the coil spring when the water in the primary flow channel flows through the valve port, and the pressure loss is large. There was an inconvenience. On the other hand, according to the pressure reducing valve 1 with a water stop function of the present embodiment, the above-described conventional inconvenience can be prevented. That is, when the pressure reducing operation is not performed, the pressure loss can be minimized, and the pressure loss can be made as low as that of a standard water stop valve having no pressure reducing mechanism.

In the pressure reducing valve 1 with a water stop function of the present embodiment, a pressing force is applied from the valve shaft 71 to the valve body 6 via the valve body connecting member 73. However, as shown in FIG. You may comprise so that a pressing force may be directly provided to. FIG. 3 is a cross-sectional view showing a modified example of the pressure reducing valve 1 with a water stop function of the present embodiment, and the same components as those in FIG. In the pressure reducing valve 10 with the water stop function of the modified example, the slider portion 3 has two bar members 32 ′ and 32 ′ offset from the central axis, and at the upper ends of the two bar members 32 ′ and 32 ′, The pressure receiving member 4 is fixed. The pressure receiving member 4 is formed with a through hole 42 ′ on the central axis. The valve body 6 has two through holes 63′63 ′ offset from the central axis, and the two rod members 32 ′ and 32 ′ of the slider portion 3 are inserted into the two through holes 63 ′ and 63 ′. ing. The pressure reducing valve with a water stop function of the modified example is formed so that the lower end portion of the valve shaft 71 is inserted through the through hole 42 ′ of the pressure receiving member 4 and comes into contact with the upper surface of the valve body 6. When the water pressure P2 in the secondary flow channel A2 exceeds the reference value in the valve-opened state of the valve body 6, the force acting on the pressure receiving surface of the pressure receiving member 4 increases, and the valve seat 15 from the pressure receiving member 4 to the valve body 6 increases. A lateral force acts, and the valve body 6 is driven away from the lower end of the valve shaft 71 toward the valve seat 15. Thereafter, a pressure reducing operation similar to that of the pressure reducing valve 1 with a water stop function of FIG. 1 is performed. On the other hand, when the operation handle 72 is operated and the valve shaft 71 is driven downward, the lower end portion of the valve shaft 71 contacts the upper surface of the valve body 6, and the valve body 6 is driven to the valve seat 15 side. The valve port 15 is closed in close contact with the seat 15. In this way, the pressure reducing valve 10 with a water stop function enters a water stop state. Also in the pressure reducing valve 10 with the water stop function of the modified example, since the coil spring 5 does not receive the compressive force in the water stop state, the deterioration of the coil spring 5 can be prevented even if the water stop state continues for a long period of time, and the operation is switched to the pressure reduction operation. Sometimes the pressure reducing operation can be normally performed.

It is sectional drawing which shows the pressure reducing valve with a water stop function of embodiment of this invention. It is a disassembled perspective view which shows a slider, a pressure receiving member, a valve body, and an opening-and-closing part. It is sectional drawing which shows the pressure reducing valve with a water stop function of a modification. It is a figure which shows the conventional pressure reducing valve with a water stop function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure reducing valve with a water stop function 2 Valve box 3 Slider 4 Pressure receiving member 5 Coil spring 6 Valve body 7 Opening and closing part A1 Primary flow channel A2 Secondary flow channel

Claims (3)

There is a flow channel between the inlet and the outlet, a valve port and a valve seat are formed in the middle of the flow channel, a primary flow channel is formed upstream of the valve port, A valve box having a secondary flow channel formed on the downstream side;
A slider movably disposed on the primary flow channel side of the valve box;
A pressure receiving member that is fixed to the downstream end of the slider and has a pressure receiving surface that is located in the secondary flow channel of the valve box and receives the water pressure of the secondary flow channel;
An urging member that is interposed between the valve box and the slider and urges the slider in a direction in which the pressure receiving member moves away from the valve seat;
A valve body movably disposed between the valve seat and the pressure receiving member in the secondary flow channel of the valve box;
A pressure reducing valve with a water stop function, comprising: an open / close unit that operates a valve body to switch between a closed state in which the valve body is in contact with the valve seat and an open state in which the valve body is separated from the valve seat. The slider has a bar member extending on the central axis of the valve body and having a tip fixed to the pressure receiving member,
The pressure receiving member has a through hole formed at a position offset from the central axis,
The valve body has a guide hole that is inserted through the rod member of the slider and guided in the valve seat contact and separation direction,
The opening / closing part is inserted into the through hole of the pressure receiving member and has one end fixed to the valve body, and is connected to the other end of the rod-like part and extends on the central axis of the valve body and is opposite to the valve body A valve body connecting member having an engaging portion projecting into the valve body, a shaft portion screwed into the valve box and disposed on the central axis of the valve body, the tip of which engages with the engaging portion of the valve body connecting member, The pressure reducing valve with a water stop function according to claim 1, further comprising a handle portion that rotates the shaft portion to advance and retreat in the axial direction. The slider is disposed at a position parallel to the center axis of the valve body and offset from the center axis of the valve body, and has a rod member whose tip is fixed to the pressure receiving member,
The pressure receiving member has a through hole formed on the central axis,
The valve body has a guide hole that is inserted through the rod member of the slider and guided in the valve seat contact and separation direction,
The opening / closing portion is screwed into the valve box and disposed on the central axis of the valve body, and is inserted into the through hole of the pressure receiving member and the tip is in contact with the valve body, and the shaft portion is rotated in the axial direction. The pressure-reducing valve with a water stop function according to claim 1, further comprising a handle portion that moves forward and backward.

Images