Automatic valve with cleaning means

Abstract

To provide an automatic valve having cleaning means which can reliably remove foreign matters adhering to an internal periphery of a discharge hole and takes reduced time and labor for maintenance for removing foreign matters.SOLUTION: To perform cleaning for removing foreign matters adhering to an internal peripheral face of a valve port 62, a valve body bar 12 is rotated and operated independently of a valve shaft 10. Specifically, a tool such as a thinner driver is fit and caulked into a valve shaft bar operation groove 12c to rotate and only the valve body bar 12. This causes the valve body bar 12 to advance in the direction of an arrow 106 independently of the valve shaft 10 following screwing of a screw connecting part 19, and protrudes from a tip face of a flat blade 10b to penetrate the valve port 62. When a tip part of the valve body bar 12 passes through the valve port 62, a thread (screw connecting part 19) formed at the tip part of the valve body bar 12 moves in a direction of entry while sliding on an internal periphery of the valve port 62. Foreign matters adhering to the internal peripheral face of the valve port 62 can be thereby scraped off.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The automatic valve having a cleaning means according to the present invention relates to a cleaning technique for removing foreign matter adhering to the valve opening of a temperature-responsive valve such as a temperature control trap. [Background technology]

[0002] Industrial plants are equipped with piping systems that transport high-temperature steam generated in boilers to their destinations, and drainage (condensed water) is generated from the steam within these piping. A branch pipe for collecting the drainage is connected to the main pipe that transports the steam, and the drainage is often discharged as waste material by a steam trap installed at the end of this branch pipe.

[0003] However, in order to intentionally retain this drain in the branch pipe and adjust the temperature of the branch pipe to a predetermined set temperature for use, a temperature-controlled trap as a temperature-responsive valve is sometimes used instead of a steam trap. For example, when transporting highly viscous fluids such as heavy oil through a transport pipe, a drop in temperature can cause the heavy oil to solidify. For this reason, a branch pipe carrying high-temperature steam or drain is placed alongside the transport pipe to function as a tracing heat transfer pipe, using the steam or drain as a heat source. By exchanging heat with the transport pipe for the heavy oil, the temperature of the heavy oil or the like is increased, preventing solidification.

[0004] For example, in the case of heavy oil, a temperature of around 40°C is sufficient for transportation, but the temperature of steam is over 100°C, so if steam or drainage is used directly as a heat source for the tracing heat transfer tube, there is a risk that the temperature of the heavy oil will rise too much. For this reason, a technology is known in which a temperature control trap is installed at the end of the tracing heat transfer tube to adjust the temperature of the tracing heat transfer tube to an appropriate set temperature.

[0005] The temperature control trap, which is installed at the end of the tracing heat transfer tube, has a valve chamber formed inside it into which steam and condensate flow from the tracing heat transfer tube, and a discharge chamber formed below the valve chamber. The valve chamber and discharge chamber are connected by a small-diameter valve port, and steam and condensate flow through the valve port with the valve chamber side upstream and the discharge chamber side downstream.

[0006] A valve stem with a valve element at its tip is disposed within the valve chamber. The tip of the valve element faces the valve port, and a bimetal laminate, which is a temperature-sensitive member, is attached to the valve stem.

[0007] When high-temperature condensate flows into the valve chamber, the bimetal laminate expands in response to this high temperature, moving the valve stem axially and closing the valve orifice. When the temperature of the condensate subsequently drops due to heat exchange with the object being heated, the bimetal laminate contracts in response to this temperature drop, and the valve stem moves as the return spring expands, opening the valve orifice and discharging the low-temperature condensate into the discharge chamber. In this way, the valve orifice opens and closes repeatedly based on the displacement of the valve stem, maintaining the temperature of the tracing heat transfer tube at a constant reference temperature.

[0008] The rear end of the valve stem protrudes outward from above the temperature control trap, and can be moved axially by an operator from outside to adjust the position of the valve stem within the valve chamber, allowing the reference temperature inside the tracing heat transfer tube to be freely set.

[0009] Incidentally, foreign matter such as rust and scale (limescale) can flow into the valve chamber of a temperature control trap along with steam and condensate. If such foreign matter adheres to and accumulates around the valve orifice, it can impede the flow of condensate, making it impossible to properly regulate the temperature of the tracing heat transfer tube. The valve orifice of a temperature control trap is particularly affected by the small diameter of the opening, which allows for fine adjustment of the condensate flow rate.

[0010] A temperature-responsive valve disclosed in Patent Document 1 below is a cleaning technology for removing foreign matter adhering to the valve port. In this temperature-responsive valve, a connecting rod 23 protruding laterally from a valve stem 12 is attached to the upper part of the valve stem 12, which has a valve element 13 attached to its tip. A vertical slit 22 is formed at the tip of an adjustment rod 17 that is threadedly connected to the valve casing 4, and the connecting rod 23 of the valve stem 12 fits into this slit 22, connecting the adjustment rod 17 and the valve stem 12. A blade 15 having a cross-face that fits into the valve element fitting hole 7 is integrally attached to the valve stem 12 above the valve element 13.

[0011] When removing foreign matter adhering to the inner wall 14 of the valve body fitting hole 7, the adjusting rod 17 is screwed in to rotate the valve stem 12. As a result, the lower end of the blade 15 provided on the valve stem 12 removes the foreign matter adhering to the inner wall 14 of the valve body fitting hole 7. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-372166 Summary of the Invention [Problem to be solved by the invention]

[0013] In the technology disclosed in the aforementioned Patent Document 1, foreign matter adhering to the inner wall 14 of the valve disc fitting hole 7 can be removed with the lower end of the blade 15 attached to the valve stem 12, but it is difficult to remove foreign matter adhering to the inner circumferential surface of the valve orifice 8. In particular, because the valve orifice 8 is formed with a small diameter, it is difficult to easily remove foreign matter adhering to the inner circumferential surface of the valve orifice 8.

[0014] Therefore, if the temperature responsive valve is disassembled and cleaned, the foreign matter adhering to the inner peripheral surface of the valve port 8 can be removed, but in this case the maintenance work can become complicated.

[0015] Therefore, the automatic valve with cleaning means of the present application aims to provide an automatic valve with cleaning means that can reliably remove foreign matter adhering to the inner surface of the valve orifice (discharge hole) and that does not require time-consuming maintenance work to remove the foreign matter. [Means for solving the problem]

[0016] The automatic valve having cleaning means according to the present invention comprises: a main body having a valve chamber space into which a fluid flows and a discharge hole communicating with the valve chamber space and discharging the fluid to the outside of the valve chamber space; a valve stem means having a valve body portion, which is disposed in the valve chamber space along a reference line and is capable of reciprocating movement in the direction of the reference line, and which moves the valve body portion in an approaching direction relative to the discharge hole to close the discharge hole, or moves the valve body portion in a retracting direction relative to the discharge hole to open the discharge hole; an opening / closing operation means for reciprocating the valve stem means; An automatic valve having a cleaning means comprising: the valve shaft means is configured to include a cleaning portion having the valve body portion and a holding portion that holds the cleaning portion, the cleaning part is capable of reciprocating in the reference line direction independently of the holding part, the cleaning portion moves further in the approach direction relative to the discharge hole from the closed state and slides along the inner periphery of the discharge hole to enter a cleaning state. It is characterized by the following. [Effects of the Invention]

[0017] In the automatic valve with cleaning means according to the present invention, the valve stem means is configured to include a cleaning part having a valve body and a holding part that holds the cleaning part. The cleaning part is capable of reciprocating movement in the reference line direction independently of the holding part, and the cleaning part moves further in the direction of entry into the discharge hole from the closed state, sliding along the inner periphery of the discharge hole to enter the cleaning state.

[0018] Therefore, foreign matter adhering to the inner periphery of the discharge hole can be reliably removed by moving the cleaning part in the direction of entry. Also, there is no need to disassemble the automatic valve to remove foreign matter adhering to the inner periphery of the discharge hole, and maintenance work for removing foreign matter is not time-consuming. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a cross-sectional view of a temperature control trap 1 that is a first embodiment of an automatic valve having a cleaning means according to the present invention, showing the temperature control trap 1 when the valve is closed. [Figure 2] 2 is an enlarged cross-sectional view of the vicinity of a valve port 62 of the temperature control trap 1 shown in FIG. [Figure 3] 2 is a plan view showing the rear end surfaces of the adjusting tube 35 and the valve body bar 12 shown in FIG. [Figure 4] 2 is a perspective view of the valve stem 10 and the valve body bar 12 shown in FIG. 1, as seen from the valve body 2 side. FIG. [Figure 5] 2 is a cross-sectional view showing the temperature control trap 1 during cleaning of the inner circumferential surface of the valve port 62 shown in FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] The main terms used in the embodiments correspond to the following elements of the automatic valve with a cleaning mechanism according to the present application:

[0021] Temperature control trap 1: Automatic valve with cleaning means Valve body 2: Valve body section Valve stem 10... Valve stem means Through hole 10d of valve stem 10...holding portion Valve disc bar 12...Cleaning section Threaded joint 19....Screw mechanism Valve casing 21 and casing cover 22: Valve body Bimetal 50 and return spring 71...opening and closing operation means Valve chamber 53 and valve seat upstream chamber 61...valve chamber space Valve port 62...discharge hole Arrow 105: Evacuation direction Arrow 106: Direction of approach Axis line L1...Reference line Steam or drainage fluid

[0022] [First embodiment] A first embodiment of an automatic valve with a cleaning mechanism according to the present invention will be described using a temperature-controlled trap as an example. The temperature-controlled trap is installed at the end of a tracing heat transfer tube and has the function of maintaining the tracing heat transfer tube at a set temperature. Tracing heat transfer tubes maintained at a constant set temperature are used as tracing to prevent the solidification of highly viscous fluids such as heavy oil, or to prevent instrumentation equipment from freezing.

[0023] (Explanation of the configuration of temperature control trap 1) 1 is a cross-sectional view of a temperature control trap 1 according to this embodiment. An inlet 26 and an outlet 29 are coaxially provided in a valve casing 21, and a casing lid 22 is attached to the top by a screw connection with a gasket 39 sandwiched therebetween. The inlet 26 is connected to the end of a tracing heat transfer tube (not shown), and the outlet 29 is connected to a discharge pipe (not shown). A valve chamber 53 is formed within the valve casing 21, and this valve chamber 53 communicates with the inlet 26 via an inlet channel 27. The outlet 29 also communicates with an outlet channel 28.

[0024] A cylindrical valve seat 60 is attached and fixed by threaded connection to the bottom chamber 54 formed at the bottom of the valve casing 21. A valve port 62 is formed in the valve seat 60, penetrating along the axis L1, and on either side of the valve port 62, a valve seat upstream chamber 61 is formed on the upstream side, and a valve seat downstream chamber 63 is formed on the downstream side. Both the valve seat upstream chamber 61 and the valve seat downstream chamber 63 have a cylindrical shape.

[0025] The diameter of the valve port 62 is configured to be sufficiently smaller than the diameters of the valve seat upstream chamber 61 and the valve seat downstream chamber 63. The valve chamber 53 communicates with the outflow port 29 via the valve chest upstream chamber 61, the valve port 62, the valve seat downstream chamber 63, the bottom chamber 54, and the outflow path 28, and forms a flow path continuing to the upstream inflow port 26 and inflow path 27.

[0026] A cylindrical screen 70 is provided inside the valve chest 53. Steam and condensate flowing in from the inlet 26 pass through the inlet passage 27, pass through the screen 70, and flow into the valve chest 53 in the direction of arrow 101. As the steam and condensate pass through the screen 70, foreign matter mixed in the steam and condensate is captured by the screen 70.

[0027] A cylindrical valve stem 10 is disposed within the valve chamber 53. The center line of the valve stem 10 coincides with the axis L1, and the valve stem 10 is disposed so as to be able to move back and forth along this axis L1 in the directions of arrows 105 and 106. A valve stem bar operating groove 12c is formed at the rear end of the valve stem 10 (Fig. 3), and a flat blade 10b having a rectangular parallelepiped shape and corners configured as cutting tools is integrally formed at the tip.

[0028] A through hole 10d is formed in the center of the valve stem 10 and the flat blade 10b along the axis L1. A cylindrical valve disc bar 12 passes through and is held in this through hole 10d. The diameter of the cross section of the valve disc bar 12 perpendicular to the axis L1 is approximately the same as the inner diameter of the through hole 10d in the valve stem 10 and the flat blade 10b, and the valve disc bar 12 can move back and forth along the axis L1 independently of the valve stem 10 and the flat blade 10b.

[0029] A screw thread is formed at the tip of the valve disc bar 12, and a screw groove that screws onto the screw thread is formed at the tip of the through hole 10d of the flat blade 10b provided on the valve stem 10. This screw engagement forms a threaded coupling 19 (see Figure 2). That is, by independently rotating the valve disc bar 12, the valve disc bar 12 moves back and forth along the axis L1 in the directions of arrows 105 and 106 relative to the valve stem 10 in accordance with the engagement of the threaded coupling 19. A conical valve disc 2 with an apex at its tip is integrally formed at the tip of the valve disc bar 12, and the valve disc 2 is positioned to protrude from the tip surface of the flat blade 10b (see Figure 4).

[0030] An adjustment tube 35 is attached to the rear end of the valve stem 10. This adjustment tube 35 is screwed to the casing lid 22 via an O-ring 36 by an adjustment screw portion 15, and can be rotated by inserting a tool such as a screwdriver into an adjustment tube operation groove 35c formed in the upper part. When the adjustment tube 35 is rotated, the adjustment tube 35 moves forward and backward in the directions of arrows 105 and 106 as the adjustment screw portion 15 is threaded. The adjusted position of the adjustment tube 35 relative to the casing lid 22 is fixed by a lock nut 89.

[0031] An adjustment space 35b is formed along the axis L1 inside the adjustment cylinder 35, and the rear end of the valve stem 10 is inserted into this adjustment space 35b. The upper part of the adjustment cylinder 35 protruding from the casing lid 22 is covered with a protective cap 37.

[0032] A connecting rod 10a protruding in both directions perpendicular to the axis L1 is fixed near the rear end of the valve stem 10. Meanwhile, a slide groove 35a is provided in the lower part of the adjusting tube 35, and the connecting rod 10a of the valve stem 10 is inserted into this slide groove 35a. That is, the valve stem 10 rotates integrally with the adjusting tube 35 as the adjusting tube 35 is screwed into it, but the valve stem 10 can also move forward and backward along the slide groove 35a in the directions of arrows 105 and 106 independently of the adjusting tube 35.

[0033] 1 are arranged coaxially so that the axes of the adjustment tube 35 and the valve seat 60 coincide with the axis L1, similar to the valve stem 10, and the valve element 2 of the valve stem 10 is positioned toward the valve orifice 62. A spring retainer 10c is fixed to the valve stem 10. The valve stem 10 passes through a central hole of a container-shaped intermediate member 75, which abuts against the underside of the spring retainer 10c. The outer side of the intermediate member 75 is curved, and a return spring 71 is attached to the inside of this curve, between the intermediate member 75 and the bottom of the valve chamber 53. That is, the valve stem 10 is constantly urged upward (in the direction of arrow 105) by the return spring 71 via the intermediate member 75 and the spring retainer 10c.

[0034] A bimetal 50 for moving the valve stem 10 downward (in the direction of arrow 106) is attached to the valve stem 10. In this embodiment, five bimetals 50 are stacked to form a laminate. The upper surface of the uppermost bimetal 50 abuts against the lower end surface 35d of the adjustment tube 35, and the lower surface of the lowermost bimetal 50 abuts against the intermediate member 75 with a flat washer 73 sandwiched therebetween.

[0035] Each bimetal 50 is a temperature-sensitive member that deforms in response to the ambient temperature, expanding along the axis L1 when the ambient temperature rises above a predetermined reference temperature, and contracting along the axis L1 when the ambient temperature falls below the reference temperature. Figure 1 shows the state in which each bimetal 50 has expanded and the valve stem 10 has moved to its limit position in the direction of arrow 106.

[0036] An over-expansion absorbing spring 72 attached to the valve stem 10 is disposed inside the intermediate member 75. The upper part of this over-expansion absorbing spring 72 abuts against a plain washer 73, and the lower part abuts against the upper side of the spring receiver 10c via a washer 85.

[0037] (Explanation of the basic operation of temperature control trap 1) Next, the basic operation of the temperature controlled trap 1 will be described. In the initial stage, the valve chamber 53 is filled with air, and each bimetal 50 contracts due to the low temperature of the surrounding air. The spring retainer 10c of the valve stem 10 is biased by the return spring 71, causing it to move in the direction of arrow 105 (not shown). At this time, the valve disc 2 also retracts in the direction of arrow 105 from the valve port 62, leaving the valve port 62 open (open state).

[0038] When the piping system starts transferring steam, condensate flows in from inlet 26 through the traced heat transfer tube in the direction of arrow 101. The condensate is initially low temperature, and pushes air out of valve port 62 and is discharged to outlet 29 in the direction of arrow 102. Subsequently, the low-temperature condensate follows the same path and is discharged from outlet 29.

[0039] After this, high-temperature condensate generated from the steam flows into the valve chamber 53 in the direction of arrow 101. As the temperature of the condensate in the valve chamber 53 rises, each bimetal 50 gradually expands. The expanding stack of bimetals 50 presses the spring retainer 10c of the valve stem 10 in the direction of arrow 106 via the flat washer 73, the over-expansion absorbing spring 72, and the washer 85.

[0040] At this time, the relatively powerful over-expansion absorption spring 72 does not contract, so the expansion of the bimetal 50 laminate is transmitted directly to the valve stem 10, and the valve element 2 enters the valve orifice 62. At this time, the return spring 71 is pressed and compressed by the expansion of the bimetal laminate 50. Then, in accordance with the degree of entry of the valve element 2, the opening area of ​​the valve orifice 62 gradually decreases along the slope (side surface) of the conical valve element 2, and eventually the valve orifice 62 is completely closed (closed state).

[0041] By reducing the opening of the valve port 62 or closing it, the amount of condensate discharged decreases or stops, and condensate at the set reference temperature accumulates in the valve chest 53 and the tracing heat transfer tube. This allows the tracing heat transfer tube to heat the heating object, such as a heavy oil transport pipe, to an appropriate temperature. After that, the temperature of the condensate in the tracing heat transfer tube gradually decreases through heat exchange with the heating object, and the temperature of the condensate in the valve chest 53 also falls below the reference temperature.

[0042] Each bimetal 50 responds to this drop in condensate temperature and begins to contract. As each bimetal 50 contracts, the return spring 71 expands and returns, pushing up the spring retainer 10c of the valve stem 10 via the intermediate member 75, causing the valve stem 10 to move in the direction of arrow 105, and the valve element 2 expands the opening area of ​​the valve port 62 to open the valve. As a result, condensate that has fallen below the reference temperature is discharged through the valve port 62 to the outlet 29. After this, high-temperature condensate flows into the valve chamber 53, and the expansion of each bimetal 50 again reduces or closes the opening area of ​​the valve port 62, allowing condensate at the reference temperature to accumulate.

[0043] As described above, each bimetal 50 expands or contracts in response to the temperature of the condensate in the valve chamber 53, causing the valve element 2 attached to the valve stem 10 to rise and fall, and the valve port 62 to repeatedly open and close, thereby maintaining the condensate in the valve chamber 53 and the tracing heat transfer tube at a set reference temperature.

[0044] Furthermore, even after each bimetal 50 expands and the valve disc 2 completely closes the valve port 62, the temperature of the drain continues to rise, and in response, each bimetal 50 may expand further. In this case, to avoid excessive strain on each bimetal 50, the over-expansion absorbing spring 72 contracts to absorb the expansion of each bimetal 50. When the over-expansion absorbing spring 72 contracts, the return spring 71 is also compressed at the same time, and the intermediate member 75 separates from the spring retainer 10c on the valve stem 10 side and descends in the direction of arrow 106.

[0045] The reference temperature of the drain in the valve chamber 53 and the tracing heat transfer tube can be freely adjusted and set. To adjust the reference temperature, remove the protective cap 37 from the top of the temperature control trap, loosen the lock nut 89, and then insert a tool such as a screwdriver into the adjustment tube operation groove 35c and screw it in to move the adjustment tube 35 along the axis L1. Note that, at this time, the adjustment tube operation groove 35c and the valve stem bar operation groove 12c are arranged in a straight line (see Figure 3), and a tool such as a screwdriver is inserted into the adjustment tube operation groove 35c and the valve stem bar operation groove 12c at the same time. Therefore, the adjustment tube 35 and the valve disc bar 12 rotate together, and the positional relationship of the valve disc bar 12 with respect to the adjustment tube 35 does not change.

[0046] When the adjusting tube 35 is tightened toward the inside of the valve chamber 53, the lower end surface 35d of the adjusting tube 35 presses against the laminated body of the bimetal 50, causing the position of the valve stem 10 itself to move downward in the direction of arrow 106, shortening the distance between the valve disc 2 and the valve orifice 62 in the open state, allowing the reference temperature to be set lower. Conversely, when the adjusting tube 35 is loosened, the bias of the return spring 71 causes the position of the valve stem 10 itself to move upward in the direction of arrow 105, lengthening the distance between the valve disc 2 and the valve orifice 62 in the open state, allowing the reference temperature to be set higher.

[0047] (Cleaning operation explanation) As described above, the valve chamber 53 is provided with a screen 70 for capturing foreign matter mixed in the steam and drain, but fine rust, scale, and other foreign matter penetrate through the screen 70 and adhere to the inner circumferential surface of the valve seat upstream chamber 61 of the valve seat 60 and the valve orifice 62, where they form clumps and solidify and accumulate. In this embodiment, the tip of the valve disc bar 12 is inserted into the valve orifice 62 to remove and clean the foreign matter adhering to the inner circumferential surface of the valve orifice 62.

[0048] When cleaning the inner peripheral surface of the valve orifice 62, each bimetal 50 is in a contracted state, the valve stem 10 and valve disc bar 12 move together in the direction of arrow 105, and the valve disc 2 is retracted from the valve orifice 62 (not shown). From this state, the protective cap 37 is removed and the lock nut 89 is loosened. First, a tool such as a screwdriver is inserted into the linearly aligned adjustment cylinder operation groove 35c and valve stem bar operation groove 12c, and the tool is tightened to the limit position (see Figure 3).

[0049] As a result, the valve stem 10 and valve disc bar 12 rotate together and advance in the direction of arrow 106, and foreign matter adhering to the side periphery and bottom surface of the valve seat upstream chamber 61 is scraped off by the rotation of the flat blade 10b integrally fixed to the tip of the valve stem 10. The state in which the tip surface of the flat blade 10b abuts on the bottom surface of the valve seat upstream chamber 61 is the limit position for the valve stem 10 to advance in the direction of arrow 106.

[0050] Next, to remove and clean foreign matter adhering to the inner circumferential surface of the valve orifice 62, the valve disc bar 12 is rotated independently of the valve stem 10. That is, a thinner tool such as a screwdriver is inserted into the valve stem bar operation groove 12c and tightened (see Figure 3), and only the valve disc bar 12 is rotated. As a result, the valve disc bar 12 advances in the direction of arrow 106 independently of the valve stem 10 as the threaded coupling portion 19 is threaded, protruding from the tip surface of the flat blade 10b and penetrating the valve orifice 62. Figure 5 shows the state in which the vicinity of the tip of the valve disc bar 12 has penetrated the valve orifice 62.

[0051] When the tip of the valve disc bar 12 penetrates the valve orifice 62, the tip of the valve disc bar 12 moves in the entry direction while sliding and rotating on the inner periphery of the valve orifice 62. This scrapes off any foreign matter adhering to the inner periphery of the valve orifice 62. Note that, as described above, a thread (screw coupling portion 19) is formed on the tip of the valve disc bar 12, and this thread can more reliably scrape off any foreign matter.

[0052] In this way, foreign matter adhering to the valve seat upstream chamber 61 of the valve seat 60 and the inner circumferential surface of the valve orifice 62 is removed and cleaned. After cleaning, the valve disc bar 12 and valve stem 10 are rotated in the opposite directions to return them to their positions before cleaning, and the protective cap 37 is attached to restore them. Note that the foreign matter scraped off by the flat blade 10b and the tip of the valve disc bar 12 is then discharged from the outlet 29 in the direction of arrow 102 together with steam and condensate when the valve orifice 62 opens.

[0053] [Other embodiments] In the above embodiment, an example is given in which an automatic valve having a cleaning means according to the present application is applied to a temperature-controlled trap 1, but this is not limited to this, and the invention can be applied to other automatic valves as long as the valve body portion (valve body 2, etc.) moves forward and backward relative to a discharge hole (valve port 62, etc.) to block or open the discharge hole.

[0054] Furthermore, the components shown in the above embodiment are merely examples, and can be replaced with other components that perform the same function. For example, although the valve stem 10 is exemplified as the valve stem means, other shapes and structures can be used as long as they are capable of reciprocating along a reference line (such as the axis L1). Furthermore, although the valve disc bar 12 is exemplified as the cleaning part, other shapes and structures can be used as long as they have a valve disc portion (such as the valve disc 2) and are capable of reciprocating along a reference line (such as the axis L1) independently of the holding part (such as the through hole 10d of the valve stem 10).

[0055] Furthermore, in the above embodiment, an example is shown in which a screw connection portion 19 (screw mechanism) is formed at the tip portion of the valve body bar 12, but it is also possible to form a screw thread at the rear end or middle portion of the valve body bar 12 (cleaning portion) and correspondingly form a screw groove at the rear end or middle portion of the through hole 10d (retaining portion) of the valve shaft 10 to form the screw connection portion 19 (screw mechanism). [Explanation of symbols]

[0056] 1: Temperature control trap 2: Valve body 10: Valve stem 12: Valve body bar 19: Threaded connection 21: Valve casing 22: Casing cover 50: Bimetal 53: Valve chamber 61: Valve seat upstream chamber 62: Valve port 71: Return spring L1: Axis

Claims

1. a main body having a valve chamber space into which a fluid flows and a discharge hole communicating with the valve chamber space and discharging the fluid to the outside of the valve chamber space; a valve stem means having a valve body portion, which is disposed in the valve chamber space along a reference line and is capable of reciprocating movement in the direction of the reference line, and which moves the valve body portion in an approaching direction relative to the discharge hole to close the discharge hole, or moves the valve body portion in a retracting direction relative to the discharge hole to open the discharge hole; an opening / closing operation means for reciprocating the valve stem means; An automatic valve having a cleaning means comprising: the valve shaft means is configured to include a cleaning portion having the valve body portion and a holding portion that holds the cleaning portion, the cleaning unit is capable of reciprocating in the reference line direction independently of the holding unit, the cleaning portion moves further in the approach direction relative to the discharge hole from the closed state and slides along the inner periphery of the discharge hole to enter a cleaning state. An automatic valve having a cleaning mechanism characterized by:

2. 2. The automatic valve with a cleaning mechanism according to claim 1, the opening and closing operation means operates in response to the temperature of the fluid, and causes the valve stem means to reciprocate. An automatic valve having a cleaning means.

3. 3. The automatic valve having a cleaning mechanism according to claim 1 or 2, the cleaning unit and the holding unit are connected by a screw mechanism, and the cleaning unit reciprocates relative to the holding unit in accordance with the screw mechanism; the screw mechanism of the cleaning part has approximately the same diameter as the discharge hole, and the screw mechanism of the cleaning part moves further in the approach direction relative to the discharge hole from the closed state and slides on the inner periphery of the discharge hole to enter a cleaning state. An automatic valve having a cleaning mechanism characterized by:

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