JP5773853B2 - Pressure reducing valve and mounting method of pressure reducing valve - Google Patents

Description

  The present invention relates to a pressure reducing valve provided with a valve mechanism unit that controls the pressure in a secondary-side flow path, and a method for attaching the pressure reducing valve.

  Conventionally, the “header method” has been widely adopted as a method of hot water supply / water supply piping in a dedicated part of hot water supply / water supply in a detached house or an apartment house. When piping used for the header system is made of flexible resin such as cross-linked polyethylene pipes, polybutene pipes, and polyethylene-aluminum composite pipes, the risk of water leakage from the connecting parts by limiting the number of connecting parts of the pipes Even if it is a case where it reduces the property and it is a case where it is simultaneously used in a some use location (water faucet), it has the merit that the flow variation of each water faucet can be suppressed. Moreover, since there is little deterioration by corrosion etc., it has the merit that water quality and hygiene can be maintained.

  In addition, the “water tank method” is widely adopted as a water supply method for small apartment houses. The water tank system is a system in which tap water is temporarily stored in a water tank provided on the roof of the apartment house or on the ground, and the stored tap water is distributed to each dwelling unit by positional energy using a height difference or pumping using a pump. Primarily, it has the merit of being able to compensate for insufficient water supply pressure on the upper floors. However, the water receiving tank method has a problem that unsanitary water is supplied to each dwelling unit due to poor management of the hygienic aspect of the water receiving tank.

  Therefore, in recent years, “directly connected direct-pressure water supply” has been widely adopted in 3 to 5 stories of middle-rise buildings due to the promotion of the “Fureshu Waterworks Project” advocated by the government. Direct-coupled direct-pressure water supply is a method of supplying tap water to upper floors using only water supply pressure without using a water receiving tank or pump, and there is a problem that unsanitary water is supplied through the water receiving tank. There is nothing. However, since the direct connection direct pressure type water supply needs to increase the water supply pressure of the water supply as compared with the conventional water receiving tank method or the like, it is necessary to reinforce the pump equipment and piping of the water supply facility. In addition, because direct-coupled direct-pressure water supply may affect the area and altitude, the water supply pressure may become abnormally high. For example, when the water supply pressure rises, the piping in the house is abnormal due to water hammer (water hammer) And the problem that the wear and deterioration of the seal member of the pipe become severe.

  In addition, the “single lever method” has been widely adopted as a faucet method for kitchens, washrooms, and baths. The single lever system has the advantage that it can be easily operated with a single operating lever to supply and stop hot water and to switch between water and hot water, but it is difficult to adjust the fine water volume, and water scatters due to excessive flow rate. Have problems such as.

Also, with regard to the water supply pressure of apartment houses, the water supply pressure to each dwelling unit fluctuates due to the difference in elevation, so the upper floor has insufficient water discharge, while the lower floor has excessive water discharge. Have problems such as. Therefore, a system is widely used in which a meter unit having a pressure reducing valve is attached to a water supply pipe of each dwelling unit and water is supplied to each dwelling unit having a different level with an appropriate water supply pressure. However, this system has not been adopted for detached houses.
In addition, regarding the water supply pressure of apartment buildings, the amount of water used by each dwelling unit increases during the morning and evening hours, so the water supply pressure from the water supply decreases. As the amount of water used decreases, the water supply pressure increases. Therefore, it has the problem that the user of each dwelling unit cannot obtain the comfortable use feeling of water. Therefore, it has been proposed to adjust the discharge flow rate when the valve is fully opened with a stop cock provided at the base of the faucet fitting. Is impossible.

  Moreover, as a hot water supply system for kitchens, washrooms, baths, etc., a “hot water storage type hot water heater” is widely adopted. In order to keep the pressure in the hot water tank below a certain level, the hot water storage type water heater is equipped with a pressure reducing valve provided at the inlet from the water supply pipe to the water heater body, and hot water is supplied with the pressure of the water supplied by the pressure reducing valve. . However, when the hot water storage type hot water heater is used in an area where the water supply pressure is high, for example, the pressure on the hot water supply side is reduced from the pressure on the water supply side, and the pressure difference between the water supply side and the hot water supply side becomes excessive. Therefore, when combined with a “thermo-type faucet” that adjusts the fluid temperature to a set temperature by automatically mixing hot and cold water and discharges water, there is a problem that temperature control becomes impossible.

  Therefore, in order to solve these problems, a pressure reducing valve for reducing the secondary side water supply pressure has been proposed (for example, Patent Document 1), and this pressure reducing valve is used as the primary side of the header pipe for hot water supply and / or water supply. This is a case where a single lever type faucet is used by suppressing the water hammer effect of the pipe to prevent the generation of abnormal noise, preventing wear and deterioration of the pipe seal member and extending the service life. Even so, attempts have been made to solve the above-described problems by suppressing the scattering of water and operating the temperature control in the “thermo-type faucet” by reducing the pressure difference between the water supply side and the hot water supply side.

JP 10-63342 A

  However, in the pressure reducing valve described in Patent Document 1, since the internal valve mechanism is complicated, for example, a piece of sealing material or a piece of piping material generated during upstream piping construction work, etc. The solid matter is easily clogged in the valve mechanism, and the solid matter clogged in the valve mechanism may impair the water tightness of the valve and the pressure adjusting function of the valve.

  The present invention has been made in view of such circumstances, and includes a valve box portion including a cylindrical unit holding portion that opens to the outside at the boundary between the primary flow path and the secondary flow path, A valve mechanism unit that controls the flow rate of the fluid flowing in accordance with the pressure fluctuation of the secondary pressure, and a lid portion that includes a removing means for removing solids such as chips contained in the fluid flowing in the valve box portion. By selecting either the valve mechanism unit or the lid according to the process and inserting it into the unit holding part, for example, a piece of sealing material generated during piping construction work including the work of installing the pressure reducing valve It is an object of the present invention to provide a pressure reducing valve that can complete the mounting operation without clogging the valve mechanism with solid matter such as chips and chips, and without impairing the water tightness of the valve and the pressure adjusting function of the valve.

  A pressure reducing valve according to the present invention is inserted in a valve box portion having a cylindrical unit holding portion that opens to the outside at a boundary between a primary-side flow passage and a secondary-side flow passage, and is detachably inserted into the unit holding portion. A water passage that communicates the primary-side flow path and the secondary-side flow path in a state of being inserted into the unit holding portion, and the flow rate of the fluid flowing through the water-flow path is a pressure of the secondary pressure. A valve mechanism unit to be controlled in accordance with fluctuations, and the valve mechanism unit is inserted in the unit holding portion in a non-inserted state in place of the valve mechanism unit, and is inserted into the unit holding portion in the primary side flow path And a lid having a removing means that forms a water passage that communicates with the flow path on the secondary side and removes solids such as chips contained in the fluid flowing through the water passage from the fluid. And

  Further, in the pressure reducing valve according to the present invention, in the state where the lid portion is inserted into the unit holding portion, a predetermined portion of the fitting portion with the unit holding portion is in a watertight sealing state, and the watertight sealing state portion And an open end of the unit holding portion, an engagement receiving portion for receiving a locking pin is formed, and the locking pin that engages with the engagement receiving portion is inserted and held in the unit holding portion so as to be detachable. The structure attached to the said unit holding | maintenance part may be sufficient.

  In the pressure reducing valve according to the present invention, the removing unit may be a member having a stitch or lattice structure.

  Further, the pressure reducing valve according to the present invention may have a configuration in which a joint for connecting to another member is attached to an end portion thereof.

  The pressure reducing valve mounting method according to the present invention is the pressure reducing valve mounting method in which the pressure reducing valve according to the present invention is installed, wherein the valve box unit is inserted into the unit holding portion in a state where the valve mechanism unit is not inserted. Is attached to open to the outside at the boundary between the primary side flow path and the secondary side flow path, and the lid is inserted into the unit holding part instead of the valve mechanism unit. Further, after removing solid matter contained in the fluid flowing through the water passage by the removing means, the lid part is removed from the unit holding part and the valve mechanism unit is inserted.

  In the present invention, for example, when flowing hot water for water flow and pressure inspection after mounting the pressure reducing valve, a lid portion having a removing means is selectively inserted into the unit holding portion of the valve box portion. Remove the solids contained in the fluid flowing in the valve box, and then remove the lid and selectively insert the valve mechanism unit with pressure adjustment function to remove the solids generated during the upstream piping construction work. Installation of the pressure reducing valve is completed safely without clogging the mechanism unit and without impairing the water tightness of the valve or the pressure adjustment function of the valve.

  Since the internal valve mechanism of the present invention is complicated, for example, even when a pressure reducing valve that is likely to be clogged with solids contained in a fluid is attached, for example, a piece of sealing material generated during upstream piping construction work or piping The mounting operation can be completed without clogging the valve mechanism with solids such as cutting chips of the material, and without impairing the water tightness of the valve and the pressure adjusting function of the valve.

It is a schematic diagram which shows the whole structure of a header piping system provided with the pressure reducing valve which concerns on this invention. It is a side view which shows an example of attachment of the pressure reducing valve which concerns on this invention. It is side view sectional drawing when the pressure reducing valve which concerns on this invention is cut | disconnected by the perpendicular direction in the state which mounted | wore with the valve mechanism unit. FIG. 4 is a cross-sectional view in plan view when the valve mechanism unit of FIG. 3 is cut in the XX direction (horizontal direction). It is side surface sectional drawing when the pressure-reduction valve which concerns on this invention is cut | disconnected by the orthogonal | vertical direction in the state which mounted | wore with the cover part. FIG. 6 is a side cross-sectional view of the pressure reducing valve according to the present invention when cut in the vertical direction with a lid portion different from that of FIG. FIG. 7 is a cross-sectional view in plan view when the lid of FIG. 6 is cut in the YY direction (horizontal direction). FIG. 4 is a side sectional view when a pressure reducing valve having a structure different from that in FIG. 3 is cut in a vertical direction with the valve mechanism unit mounted.

Embodiment 1.
A pressure reducing valve according to the present invention and a header piping system including the pressure reducing valve will be described below with reference to the drawings showing the present embodiment. As shown in the drawing, the header piping system includes a header pipe 1, a pressure reducing valve 2, a joint 3, a fastener 4, a lead-in pipe 5, an indoor pipe 6, and a faucet fitting 7.

  The header pipe 1 is formed of, for example, a flexible synthetic resin such as a cross-linked polyethylene resin, and connects a lead-in pipe 5 that takes in hot water from the outside and an indoor pipe 6 that supplies hot water to the faucet fitting 7. It is a header for. In addition, the header pipe 1 includes a header body 10 and a plurality of header branch portions 11 that branch from the header body 10.

  In the header body 10, the primary inlet is indirectly connected to the drawing pipe 5 and receives hot water passing through the drawing pipe 5. The plurality of header branching portions 11 have secondary outlets connected to the indoor piping 6, respectively, and divide the hot water passing through the header body 10 and send it to the indoor piping 6. Supply to the stopper fitting 7.

  The header pipe 1 has a pressure reducing valve 2 and a joint 3 interposed between the primary side inlet and the lead-in pipe 5. One end of the joint 3 is connected to the lead-in pipe 5, the other end is connected to the pressure reducing valve 2, and the connection portion is fixed so as not to be pulled out by being sandwiched between the fasteners 4.

  The pressure reducing valve 2 receives the pressure on the secondary side (secondary pressure) by a diaphragm 212 described later, and operates the output valve 229 by the balance between the received force and the restoring force of the secondary pressure adjusting spring 215, It is an apparatus that adjusts the opening of a water passage communicating with a flow path and a secondary-side flow path to lower the secondary pressure and supply hot water to the secondary side. The pressure reducing valve 2 controls the flow rate of hot water flowing from the drawing pipe 5 to the indoor pipe 6. Hot water passing through the indoor pipe 6 is supplied to each faucet fitting 7.

(Regarding the configuration of the pressure reducing valve 2)
As shown in FIGS. 3 to 7, the pressure reducing valve 2 includes a valve box portion 20, a valve mechanism unit 21, and a lid portion 25.

  In the valve box portion 20, a unit holding portion 200 penetrating in the vertical direction is formed in the upper half portion. The unit holding part 200 includes a cylindrical body part that opens to the outside at the boundary between the primary side flow path and the secondary side flow path, and the upper end of the body part opens to form an open end. In addition, a vacant chamber 201 communicating with the lower end opening of the trunk is formed.

  The vacant chamber 201 communicates with a connecting portion 202 formed on the secondary side (header pipe 1 side). A primary inlet of the header pipe 1 is fitted around the connection portion 202. Further, the valve box portion 20 has an inlet 203 to the trunk portion of the unit holding portion 200 formed on the primary side (the joint 3 side), and a connection portion 204 formed on the primary side from the inlet 203. The joint 3 is fitted into the connection portion 204. In the unit holding part 200, an insertion hole 205 for inserting a locking pin 230 described later is formed in the middle between the open end of the body part and the inlet 203 (see FIG. 2).

(Regarding the valve mechanism unit 21)
As shown in FIGS. 3 and 4, the valve mechanism unit 21 is inserted from the open end of the unit holding part 200 and is detachably attached. The valve mechanism unit 21 includes a diaphragm chamber 213 that includes a base plate 210 and a spring cap 211 and includes a diaphragm 212, and a unit body 218 that protrudes from the center of the base plate 210. These units can be integrated together and exchanged. It has a simple cartridge structure.

  The diaphragm chamber 213 has a plate 210 made of a sheet metal disk and a spring cap 211 having a trapezoidal shape in a side view facing each other, and a diaphragm 212 is interposed between them. Are overlapping. In the diaphragm chamber 213, a spring receiver 214 is attached to the upper surface of the substrate 210, and a secondary pressure adjusting spring 215 is interposed between the spring receiver 214 and an adjusting nut 216 screwed into the upper end of the spring cap 211. ing. In the diaphragm chamber 213, a secondary pressure chamber 217 is formed between the substrate 210 and the diaphragm 212. The diaphragm chamber 213 has a threaded portion formed at the center of the diaphragm 212, and a unit body 218 is threadedly connected to the threaded portion.

  The unit body 218 includes a cylindrical valve seat 219 having an outer diameter substantially the same as the inner diameter of the body portion of the unit holding portion 200. The valve seat 219 is formed with an insertion hole 220 that is inserted into the inside of the cylinder in the axial direction, a first annular groove 221 is formed in the middle of the outer peripheral surface of the cylinder, and a second annular groove 222 is formed above and below it. Has been. An O-ring 226 for sealing is fitted in the second annular groove 222. The O-ring 226 is in close contact with the inner peripheral surface of the body part of the unit holding part 200 and causes a watertight seal.

  In the unit body 218, a communication hole 224 for communicating the first annular groove 221 and the insertion hole 220 is formed at a predetermined interval at the groove bottom of the first annular groove 221. Further, the unit body 218 is formed with a plurality of pressure introducing holes 225 which are parallel to the insertion hole 220 and partitioned from the communication hole 224.

  Further, the unit body 218 engages a locking pin 230 described later between the second annular groove 222 and the upper end of the cylinder of the valve seat 219 (that is, a position corresponding to the open end of the unit holding portion 200). An engagement receiving groove 223 for receiving is formed. The engagement receiving groove 223 is formed so that the groove width is slightly larger than the wire diameter of a locking pin 230 described later.

  In the unit body 218, the output shaft 227 extends from the threaded portion of the diaphragm 212 toward the insertion hole 220, and a slide valve 228 formed near the upper end of the output shaft 227 slides on the inner peripheral surface of the insertion hole 220. Fits freely. The output shaft 227 is inserted with the lower end side having a margin from the inner peripheral surface of the insertion hole 220, protrudes from the lower end of the cylinder of the valve seat 219, and the output valve 229 is connected to the protruding portion. . The output valve 229 faces the lower end of the cylinder of the valve seat 219.

  The locking pin 230 is a metal wire, curved in a U shape in plan view, and two curved tips are inserted from the insertion holes 205 of the unit holding part 200 to engage the unit body 218. It is formed to have a size that fits into the receiving groove 223 and the engaging receiving groove 253 of the lid portion 25.

(About the lid 25)
As shown in FIGS. 5 to 7, the lid portion 25 is inserted into the unit holding portion 200 that is opened because the valve mechanism unit 21 is not inserted, instead of the valve mechanism unit 21. The lid 25 includes a resin disc-shaped lid body 250 that closes the open portion of the open end of the unit holding portion 200, and a hanging piece 251 that hangs down from the periphery of the lid main body 250 within the body portion of the unit holding portion 200. Mates to the peripheral surface.

  In addition, the hanging piece 251 has a third annular groove 252 formed on the outer peripheral surface, and is engaged between the third annular groove 252 and the lid body 250 (that is, a position corresponding to the open end of the unit holding portion 200). An engagement receiving groove 253 that receives the engagement of the stop pin 230 is formed. A sealing O-ring 254 is fitted in the third annular groove 252. The O-ring 254 is in close contact with the inner peripheral surface of the body part of the unit holding part 200 and causes a watertight seal.

  Further, the lid 25 shown in FIGS. 6 and 7 further includes the following configuration. The hanging piece 251 has a protrusion 255 protruding on the inner peripheral surface. Moreover, the cover part 25 is provided with the removal member holding | maintenance part 256 into which the upper end part fits into the drooping piece 251. As shown in FIG. The removal member holding portion 256 has a cylindrical shape, and a notch 257 is formed at the upper end portion of the cylinder so that the diameter of the removal member holding portion 256 is reduced when fitted into the hanging piece 251.

  Further, the removal member holding portion 256 protrudes from the upper end portion of the cylinder so as to avoid the notch 257, and is hooked on the protrusion 255 of the hanging piece 251 when it is fitted into the hanging piece 251.

  Further, the removal member holding portion 256 has a fourth annular groove 259 formed in the middle of the outer peripheral surface of the cylinder, and a communication hole 260 for communicating the fourth annular groove 259 and the hollow of the hanging piece 251 is the first. It is formed at a predetermined interval in the groove bottom of the four annular grooves 259.

  Further, the removal member holding portion 256 has a removal member holding rod 261 laid over the lower end opening portion of the cylinder, and the removal member 262 is attached to the lower end opening portion of the cylinder so as to be supported by the removal member holding rod 261. The removal member 262 corresponds to, for example, a wire mesh in which a metal wire is knitted in a lattice shape, a stitch structure product made of a resin molded product, or the like.

(How to install the pressure reducing valve 2)
Since the valve mechanism unit 21 has a cartridge structure, the pressure reducing valve 2 is detachable from the unit holding part 200 of the valve box part 20. In the header piping system, an operator attaches the header pipe 1 to a predetermined installation location. The operator inserts a lid portion 25 serving as a substitute for the valve mechanism unit 21 into the unit holding portion 200 of the pressure reducing valve 2.

  The operator inserts the lid portion 25 into the unit holding portion 200 with the removal member holding portion 256 facing down so that the hanging piece 251 and the removal member holding portion 256 become a fitting portion with the unit holding portion 200. These are inserted while sliding on the inner peripheral surface of the body part of the unit holding part 200. The operator closes the unit holding part 200 by inserting the lid part 25 until the fourth annular groove 259 of the removal member holding part 256 communicates with the inlet 203 of the unit holding part 200.

  The operator inserts the locking pin 230 into the engagement receiving groove 253 through the insertion hole 205 of the unit holding part 200 and fixes the lid part 25 so as not to come out of the unit holding part 200. The locking pin 230 is fitted between the O-ring 254 that forms a water-tight seal state and the open end of the unit holding part 200, thereby preventing the O-ring 254 from jumping out from the open end side.

  The operator inserts the connecting portion 202 of the pressure reducing valve 2 into the inlet of the primary side of the header pipe 1, fits the connecting portion 204 of the pressure reducing valve 2 to the joint 3, and inserts the lead-in pipe 5 into the joint 3. Connect with.

  Finally, the worker attaches faucet fittings 7 to various places such as kitchens, washrooms, and baths, and draws indoor piping 6 between header pipe 1 and faucet fittings 7 so that they can be passed from indoor to outside. These are laid out by pulling out the lead-in pipes 5 to complete the assembly of the system.

(Removal function by the lid 25)
When the lid portion 25 is attached as described above, the O-ring 254 of the removal member holding portion 256 is brought into close contact with the inner peripheral surface of the unit holding portion 200 to form a watertight seal. A water passage that communicates from the primary side flow path to the secondary side flow path is formed from the four annular concave grooves 259 to the inside of the cylinder of the removal member holding portion 256.

  The lid portion 25 pours hot water flowing into the valve box portion 20 of the pressure reducing valve 2 into the fourth annular groove 259 of the removal member holding portion 256 via the inlet 203 of the unit holding portion 200 in water flow and pressure inspection. Then, the hot water that has flowed into the fourth annular groove 259 is poured into the inside of the cylinder of the removal member holding portion 256 through the communication hole 260. The hot water flows into the vacant chamber 201 of the valve box portion 20 through the removing member 262 attached to the opening at the lower end of the cylinder of the removing member holding portion 256, and flows into the header pipe 1 through the vacant chamber 201. .

  At this time, the removing member 262 of the lid portion 25 removes solid matter such as chips and chips of the sealing material generated during piping construction work contained in the hot water, and supplies the hot water from which the solid matter has been removed to the empty chamber 201. And pour. The operator pours hot water until the removal member 262 removes all solids present in the header piping system.

(Secondary pressure control by pressure reducing valve 2)
The operator conducts the water flow and pressure inspection without any problems, removes all the solid matter present in the header piping system, removes the cover 25 storing the collected solid matter, and installs it in the valve mechanism unit 21. Exchange. Since the pressure reducing valve 2 is mounted with the valve mechanism unit 21, the primary side flow path to the secondary side flow path from the first annular groove 221 to the insertion hole 220 in the valve seat 219 through the communication hole 224. When the secondary pressure rises by forming a water passage that communicates with the secondary pressure chamber, the pressure in the secondary pressure chamber 217 increases through the insertion hole 220 and the pressure in the secondary pressure chamber 217 increases. Pushes up the diaphragm 212 and the spring receiver 214 from below. The spring receiver 214 presses and contracts the secondary pressure adjustment spring 215, and the diaphragm 212 pushes up the output shaft 227 that is screwed together via a threaded portion. The output shaft 227 moves upward together with the output valve 229 while the sliding valve 228 slides on the inner peripheral surface of the insertion hole 220. The output valve 229 contacts the lower end of the valve seat 219 and closes the water passage leading to the empty chamber 201.

  On the other hand, when the secondary pressure drops, the pressure reducing valve 2 releases the pressure of the secondary pressure chamber 217 through the insertion hole 220, and accordingly, the spring receiver 214 and The diaphragm 212 is pushed down. Diaphragm 212 pushes down output shaft 227 that is screwed together via a threaded portion, and output shaft 227 moves downward together with output valve 229 while sliding valve 228 slides on the inner peripheral surface of insertion hole 220. To do. The output valve 229 releases the contact with the lower end of the valve seat 219 and opens a water passage leading to the empty chamber 201. The pressure reducing valve 2 controls the pressure on the secondary side as viewed from the pressure reducing valve 2 to be equal to or lower than a predetermined pressure by the series of operations described above.

(Fastener connection)
In the embodiment described above, the fastener-type joint is applied to the connection between the header pipe 1 and the pressure reducing valve 2 and the connection between the pressure reducing valve 2 and the joint 3. Fastener-type joining is a method for easily attaching and detaching, and the joining work is easy even in a narrow working space compared to the conventional joining method. The header pipe 1 and the pressure reducing valve 2 are relatively connected. The angle position can be easily adjusted. Further, even when the pressure reducing valve 2 is additionally installed, the construction thereof becomes easy.

  However, the present invention is not limited to the application of the fastener-type joining, and for example, the joining using a conventional screw joint using a taper screw for a pipe or a cap nut equipped with a parallel thread for a pipe is applied. You may make it do.

(About header piping system)
As described above, by providing the pressure reducing valve 2, the header piping system conventionally solves various problems that are manifested by an increase in water supply pressure. That is, in the header piping system, the pressure reducing valve 2 is attached to the primary inlet of the header pipe 1 to reduce the pressure of the hot water supply water and guide the hot water to the faucet fitting 7.

  As a result, even when a single lever type faucet is used, excessive hydraulic power is suppressed, unpleasant water splashing is prevented, excessive use of water is prevented, and water conservation and water resource protection are achieved. In addition, it suppresses the water hammer effect of the pipe that occurs when the faucet is opened, and prevents the generation of unpleasant noise in the pipe.

  Conventionally, a self-sealing structure has been adopted for piping seal members in order to increase the water-stopping performance. However, as the water supply pressure increases, deterioration due to compression set of rubber is promoted and wear resistance due to sliding is increased. As the wear increases, the wear becomes severe, and the service life is adversely affected. Therefore, the header piping system reduces the pressure of hot water supply water and guides it to the faucet fitting 7 for hot water, thereby suppressing deterioration and wear of the seal member and contributing to a longer life.

Embodiment 2. FIG.
In addition to the configuration described in the first embodiment, the pressure reducing valve 2 includes a check valve 27 in the vicinity of the connection portion 202 on the secondary side, and this check valve 27 allows the secondary side (header pipe 1 side) to be connected. You may make it prevent the inflow of the hot water which flows backward (refer FIG. 8).

  Generally, in the case of a detached house, the header pipe 1 for hot and cold water supply is installed under the floor on the first floor. However, in recent years, low-rise apartment houses, houses where the water environment is concentrated on the second floor, and two-generation houses installed on both the first and second floors have been proposed, and the header pipe 1 is located on the first floor. More cases are installed behind the ceiling. Thus, the ceiling of the first floor is in an environment vulnerable to water leakage, such as a gypsum ceiling board, glass wool as a sound absorbing material, and electrical equipment.

  Therefore, when replacing the valve mechanism unit 21 from the lid 25 on the first floor ceiling, care must be taken so that the hot water remaining in the piping does not leak out. Therefore, the pressure reducing valve 2 includes the check valve 27 attached in the vicinity of the connection portion 202 on the secondary side, so that when the lid portion 25 is removed, water is removed from the header pipe 1 through the indoor pipe 6. Hot water remaining in the range reaching the plug fitting 7 is not ejected from the open end of the unit holding part 200 due to a water head difference. As a result, when the operator replaces the lid 25 with the valve mechanism unit 21, the operator can work without adversely affecting other facilities and the environment.

  Since the configuration other than the check valve 27 is the same as that of the first embodiment described above, the corresponding portions are denoted by the same reference numerals, and the description thereof is omitted. However, the connecting portion 202 is different from the first embodiment in that the inlet on the primary side of the header pipe 1 is fitted.

DESCRIPTION OF SYMBOLS 1 Header pipe 2 Pressure reducing valve 20 Valve box part 200 Unit holding part 201 Vacant room 202 Connection part (secondary side connection part)
203 Inlet 204 Connection (primary side connection)
205 Insertion hole 21 Valve mechanism unit 210 Substrate 211 Spring cap 212 Diaphragm 213 Diaphragm chamber 214 Spring receiver 215 Secondary pressure adjustment spring 216 Adjustment nut 217 Secondary pressure chamber 218 Unit body 219 Valve seat 220 Insertion hole 221 First annular groove 222 Second annular groove 223 Engagement groove 224 Communication hole 225 Pressure hole 226 O-ring 227 Output shaft 228 Slide valve 229 Output valve 230 Locking pin 25 Lid portion 250 Lid body 251 Drooping piece 252 Third annular groove 253 Engagement receiving groove 254 O-ring 255 Protrusion 256 Removal member holding portion 257 Notch 258 Hanging claw 259 Fourth annular groove 260 Communication hole 261 Removal member holding rod 262 Removal member 27 Check valve 3 Joint 4 Fastener 5 Pull-in piping 6 Indoor piping 7 Faucet fittings

Claims (5)

A valve box portion including a cylindrical unit holding portion that opens to the outside at the boundary between the primary-side flow path and the secondary-side flow path;
It is inserted into the unit holding part so that it can be pulled out, and in the state of being inserted into the unit holding part, a water passage that communicates the primary side flow path and the secondary side flow path is formed, and flows through the water passage. A valve mechanism unit for controlling the flow rate of the fluid according to the pressure fluctuation of the secondary pressure;
The valve mechanism unit is inserted in the unit holding part in the uninserted state in place of the valve mechanism unit, and the primary side flow path and the secondary side flow path are communicated with the valve mechanism unit inserted in the unit holding part. And a lid having a removing means for removing solids such as chips contained in the fluid flowing through the water passage from the fluid.   When the lid is inserted into the unit holding portion, a predetermined portion of the fitting portion with the unit holding portion is in a watertight seal state, and the watertight seal state portion and the open end of the unit holding portion are An engagement receiving portion for receiving a locking pin is formed therebetween, and the locking pin that engages with the engagement receiving portion is inserted into and held by the unit holding portion so as to be freely inserted and removed, thereby being attached to the unit holding portion. The pressure reducing valve according to claim 1.   The pressure reducing valve according to claim 1 or 2, wherein the removing means is a member having a stitch or lattice structure.   The joint for connecting with another member is attached to the edge part of it, The pressure reducing valve in any one of the Claims 1 thru | or 3 characterized by the above-mentioned. In the attachment method of the pressure reducing valve which installs the pressure reducing valve in any one of Claims 1 thru / or 4,
In a state where the valve mechanism unit is not inserted, the valve box part is attached so that the unit holding part is opened to the outside at the boundary between the primary side flow path and the secondary side flow path,
The lid is inserted into the unit holding part instead of the valve mechanism unit,
The solid matter contained in the fluid flowing in the water passage formed in the lid portion is removed by the removing means, and then the lid portion is removed from the unit holding portion and the valve mechanism unit is inserted. How to install the pressure reducing valve.

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