JP2020176631A - Automatic valve with backflow prevention mechanism and cleaning mechanism - Google Patents

Abstract

To provide an automatic valve with a backflow prevention mechanism and a cleaning mechanism capable of properly exhausting initial air and easily cleaning a valve port.SOLUTION: In an initial state of a steam trap 1, a bimetal 40 pushes up a float 10 and an orifice 61 is opened, such that initial air is speedily exhausted from an outlet 55 in a direction of an arrow 92 from the orifice 61 when steam transfer of a piping system is started. When drain flows back from the outlet 55, a check valve 2 is floated and closes a rear end of the orifice 61, thereby preventing back flow. Further, at the time of cleaning for removing a foreign substance deposited on the orifice 61, a cleaning bar 3 is moved forward in a direction of an arrow 101 by screwing, the check valve 2 is pressed by a cleaning presser part 31, and an entering projection 25 of the check valve 2 is made enter and penetrate the orifice 61.SELECTED DRAWING: Figure 1

Description

The automatic valve having a check flow prevention mechanism and a cleaning mechanism according to the present application relates to a technique for cleaning an inlet portion of an automatic valve such as a steam trap having a check flow prevention mechanism.

For example, there is a steam trap as an automatic valve. Steam traps are installed everywhere in the piping system for steam transfer installed in industrial plants, etc., so that the drain generated from the steam in the piping is appropriately discharged to the outside of the piping and the steam is not leaked as much as possible. Works on.

There are various types of steam traps, but float traps have a hollow float built into the valve chamber. Normally, this float closes the drain outlet formed near the bottom of the valve chamber, but when drain flows into the valve chamber, this float floats as the drain stays, and the drain outlet is opened. Open. Since the drain discharge port is opened, the drain accumulated in the valve chamber is automatically discharged from the drain discharge port toward the drain recovery pipe in response to the high pressure in the pipe. After draining the drain, the float descends and returns to its original position, closing the drain outlet again.

Here, when back pressure is generated on the discharge side of the steam trap, drain may flow back into the valve chamber from the drain recovery pipe. If the drain flows back into the valve chamber, a check valve may be provided at the drain outlet because the steam transfer in the piping system is hindered.

In addition, foreign matter such as rust and scale (scale) may enter the valve chamber of the steam trap together with the inflowing drain. Then, when such a foreign substance adheres to the drain discharge port and accumulates, the drain discharge port is blocked by the foreign substance and clogging occurs, and even if the float floats, the drain cannot be properly discharged. In particular, since the drain outlet is formed in an orifice shape with a small diameter in relation to the contact surface of the float, clogging by foreign matter is likely to occur. For this reason, the steam trap may be provided with a cleaning mechanism for removing foreign matter adhering to or accumulating on the drain outlet.

As a steam trap provided with the above-mentioned check valve and cleaning mechanism, there is a float type drain trap disclosed in Patent Document 1 described later. In this float type drain trap, a valve seat member 8 is arranged in the lower part of the valve chamber 4, and a valve opening 11 is formed in the valve seat member 8. The valve port 11 communicates the valve chamber 4 with the outlet 7 (Patent Document 1, paragraph number 0008). Then, the operating member 13 provided with the pressure receiving wall portion 14 is arranged in the valve seat member 8, the operating member 13 is advanced by the spring 15, and is positioned in the valve port 11, and the flange-shaped pressure receiving wall portion 14 is used. The valve opening 11 is closed (Patent Document 1, paragraph number 0009).

When a drain flows into the valve chamber 4 from the inlet 5 and the float 17 floats to open the valve opening 11, the drain drain passing through the valve opening 11 collides with the pressure receiving wall portion 14 and compresses the spring 15. The operating member 13 is retracted from the valve port 11, and the drain is discharged from the through hole 12 to the outlet 7 through the outlet passage 10 (Patent Document 1, paragraph number 0010). Then, when the float 17 descends and closes the valve opening 11, the operating member 13 invades the valve opening 11 under the urgency of the spring 17 and removes the foreign matter adhering to the valve opening 11 (Patent Document 1). , Paragraph number 0010). Further, when the fluid pressure on the outlet 7 side becomes higher than that on the inlet 5 side, the operating member 13 further advances, the pressure receiving wall portion 14 abuts on the check valve seat portion 16 and closes the valve opening 11, and backflow is prevented. (Patent Document 1, paragraph number 0010).

JP-A-2007-247789

The float type drain trap disclosed in Patent Document 1 described above cannot properly exhaust the initial air accumulated in the pipe at the initial stage of the start of steam transfer. That is, in a normal state, the operating member 13 and the pressure receiving wall portion 14 are in a state of advancing under the urgency of the spring 15, and the pressure receiving wall portion 14 comes into contact with the check valve seat portion 16 to close the valve opening 11. There is. Therefore, the initial air in the valve chamber 4 is not exhausted at the initial stage of the start of steam transfer, and the drain cannot flow into the valve chamber 4.

Therefore, the automatic valve having the check flow prevention mechanism and the cleaning mechanism according to the present application has a problem of solving these problems, and can properly exhaust the initial air and easily clean the valve opening. It is an object of the present invention to provide an automatic valve having a check mechanism and a cleaning mechanism capable of preventing flow.

The automatic valve having the check flow prevention mechanism and the cleaning mechanism according to the present application is
An operating flow path that has an inflow part and an outflow part and allows the fluid that has flowed in from the inflow part to flow out from the outflow part
A backflow prevention valve that is movably located in the working flow path and has a closing part that closes the inflow part and an invading part that invades the inflowing part, and is in the initial state or the fluid flows from the inflowing part. When it flows into the road, it evacuates from the inflow part and opens the inflow part, and when the fluid flows back from the outflow part into the operating flow path, it receives the backflow and advances toward the inflow part and flows in by the closed part. Backflow prevention valve that closes the part,
It is a cleaning unit that is located toward the operating flow path and can be operated from the outside of the operating flow path. When the cleaning operation is performed from the outside, it works on the check valve to advance the check valve toward the inflow section. Cleaning unit that allows the intrusion part to enter the inflow part,
It is characterized by being equipped with.

In the automatic valve having the check flow prevention mechanism and the cleaning mechanism according to the present application, the check flow prevention valve is positioned so as to retract from the inflow portion and open the inflow portion in the initial state. Therefore, the initial air can be reliably exhausted from the outflow portion through the inflow portion.

Further, when the cleaning operation is performed from the outside, the cleaning unit acts on the check valve to advance the check valve toward the inflow section, and causes the intrusion section to enter the inflow section. Therefore, foreign matter adhering to the inflow portion can be removed, and cleaning can be easily performed.

It is sectional drawing of the initial state of the float type steam trap 1 which shows 1st Embodiment of the automatic valve which has the check flow prevention mechanism and cleaning mechanism which concerns on this application. It is an enlarged sectional view of the float type steam trap 1 near the valve seat 6 shown in FIG. It is a side view of the check valve 2 shown in FIG. It is a front view of the check valve 2 shown in FIG. It is sectional drawing which shows the state in the normal operation of the float type steam trap 1 shown in FIG. It is an enlarged cross-sectional view around the valve seat 6 which shows the state at the time of the backflow of the float type steam trap 1 shown in FIG. It is an enlarged cross-sectional view around the valve seat 6 which shows the state at the time of cleaning of the float type steam trap 1 shown in FIG. It is sectional drawing of the initial state in the vicinity of the valve seat 6 which shows the 2nd Embodiment of the automatic valve which has the backflow prevention mechanism and cleaning mechanism which concerns on this application.

The main terms shown in the embodiments correspond to the following elements of the automatic valve having the check flow prevention mechanism and the cleaning mechanism according to the present application, respectively.
Steam trap 1 ・ ・ ・ Automatic valve Check valve 2, 7 ・ ・ ・ Backflow prevention valve Cleaning bar 3 and cleaning Pressing part 31, 81 ・ ・ ・ Cleaning part Check valve space 21a, 21b, 21c ・ ・ ・ Passing space intrusion Protrusions 25, 75 ・ ・ ・ Intrusion part Spherical part 28, 78 ・ ・ ・ Closure part Orifice 61 ・ ・ ・ Inflow part Valve chamber space 62 ・ ・ ・ Operating flow path Valve seat outlet 69 ・ ・ ・ Outflow part Check valve recess 70 and pressing protrusion 80 ... Coupling means Air, steam or drain ... Fluid

[First Embodiment]
An example in which the first embodiment of the automatic valve having the check flow prevention mechanism and the cleaning mechanism according to the present application is applied to the steam trap will be described.

(Explanation of the configuration of steam trap 1)
A large number of steam traps are provided throughout the piping system installed in the industrial plant to drain the drain as appropriate. FIG. 1 is a cross-sectional view of the steam trap 1 in the present embodiment. A branch pipe is provided in communication with the main pipe of the pipe (not shown), and a steam trap 1 is attached to this branch pipe.

The lower body 12 is fixed to the upper body 11 of the steam trap 1 with bolts, and the space formed inside is configured as the valve chamber 15. An inlet 51 is formed in the upper main body 11, and a branch pipe (not shown) is connected to the inlet 51, and steam or drain flows from the inlet 51 into the valve chamber 15 along the direction of the arrow 91. Further, an outlet 55 is formed in the upper main body 11, and a drain collection pipe (not shown) is connected to the outlet 55 to drain the drain through the outlet 55.

A float 10 which is a hollow spherical body is freely positioned in the valve chamber 15. Further, a mesh cover 45 is arranged in a state of being fixed with bolts on the upper part of the valve chamber 15. The mesh cover 45 catches foreign matter flowing in from the inlet 51 together with steam and drain.

A bimetal 40 is arranged in a bolted state at the lower part of the valve chamber 15 and is in contact with the bottom of the float 10. The bimetal 40 is formed by laminating two types of members having different expansion coefficients and bending them. The bimetal 40 utilizes the difference in the expansion coefficient of the members, and when the temperature of the members falls below a predetermined temperature, the opening of the curved portion (U-shaped portion) becomes large, as shown in FIG. Lift the float 10 from below. Further, when the temperature of the member exceeds a predetermined temperature from this state, the curved portion (U-shaped portion) is deformed so as to be smaller in opening.

A through hole is formed in the vicinity of the bottom of the lower body 12, and a valve seat 6 is attached to the valve chamber 15 side of the through hole. FIG. 2 is an enlarged cross-sectional view of the vicinity of the valve seat 6. As shown in FIG. 2, the valve seat 6 is fixed by being screwed into the through hole of the lower body 12 with the gasket 68 interposed therebetween.

The valve seat 6 is formed with an orifice 61 at the tip on the valve chamber 15 side, and the valve seat 6 is further formed with a valve seat space 62 which is a cylindrical through hole. The rear end of the valve seat space 62 is opened as a valve seat outlet 69. The orifice 61 and the valve seat space 62 are in communication with each other, and the cylinder diameter of the valve seat space 62 is larger than the inner diameter of the orifice 61.

As shown in FIG. 1, the valve seat space 62 of the valve seat 6 communicates with the outlet passage 53 formed in the lower main body 12, the outlet passage 54 formed in the upper main body 11, and the outlet 55, and is inside the valve chamber 15. Drain from valve seat 6 through these paths and from outlet 55 along the direction of arrow 92. When the float 10 is released from the interference caused by the bimetal 40, the float 10 sits on the valve seat 6 and comes into contact with the float 10 to close the orifice 61.

A check valve 2 is freely advancing and retreating in the valve seat space 62 of the valve seat 6. FIG. 3 is a side view of the check valve 2, and FIG. 4 is a front view of the check valve 2. In addition, in FIG. 1 and FIG. 2 described above, the check valve 2 of the cross section in the direction of III-III shown in FIG. 4 is shown.

The check valve 2 is composed of an integrally formed pressure receiving portion 21, a spherical portion 28, and an intrusion protrusion 25. The pressure receiving unit 21 includes three pressure receiving pieces 21a, 21b, and 21c. As shown in FIG. 4, the pressure receiving pieces 21a, 21b, and 21c project radially from the spherical surface portion 28 and are arranged at equal intervals, and the check valve spaces 22a and 22b are arranged between the pressure receiving pieces 21a, 21b, and 21c, respectively. , 22c is formed.

Further, the diameter of the circle represented by the outer edge of the pressure receiving portion 21 is configured to be slightly smaller than the cylindrical diameter of the valve seat space 62, and the check valve 2 is shown in FIGS. 1 and 2 in the valve seat space 62. While maintaining the indicated posture, the valve seat space 62 can freely advance and retreat in the direction of the central axis, that is, in the directions of arrows 101 and 102. A stopper 65 is fixed in the vicinity of the valve seat outlet 69 of the valve seat 6, and the check valve 2 becomes a valve when the pressure receiving pieces 21a, 21b, and 21c of the check valve 2 come into contact with the stopper 65. It does not fall out of the counterbore outlet 69 and is held in the valve seat space 62.

The diameter of the sphere represented by the outer circumference of the spherical portion 28 of the check valve 2 is formed to be larger than the diameter of the orifice 61, and when the check valve 2 advances in the direction of arrow 101 and reaches the limit position, the spherical portion 28 is formed. The rear end of the orifice 61 is closed.

Further, the thickness of the intrusion protrusion 25 extending from the spherical portion 28 toward the tip is formed to be slightly smaller than the diameter of the orifice 61, and when the check valve 2 advances in the direction of arrow 101, the intrusion protrusion 25 Invades the orifice 61, and when the check valve 2 advances and reaches the limit position, it penetrates the orifice 61 and protrudes toward the valve chamber 15.

Behind the valve seat outlet 69 of the valve seat 6, a plug 37 is screwed into a through hole of the lower body 12 via a gasket 38 and fixed. Through holes are formed in the plug 37 and the gasket 38 along the central axis. A cleaning bar 3 is attached to the through hole of the plug 37 so that it can be screwed in via a screw mechanism.

A cleaning pressing portion 31 is integrally connected to the tip of the cleaning bar 3, and the cleaning pressing portion 31 is arranged toward the valve seat space 62 of the valve seat 6. The rear end of the cleaning bar 3 projects from the plug 37 to the outside of the lower body 12, and an operation groove 35 is formed on the protruding rear end surface. When the cleaning bar 3 is rotated, the cleaning bar 3 moves back and forth in the direction of arrow 101 or arrow 102 according to the screw mechanism in response to this rotation.

The central axes of the valve seat 6, the check valve 2, the cleaning bar 3, and the cleaning pressing portion 31 are arranged so as to be located on the same line.

(Initial state of steam trap 1 / Explanation during normal operation)
First, the normal operation after the steam transfer is started from the initial state of the steam trap 1, that is, the state before the piping system starts the steam transfer will be described. In the initial state, since the steam trap 1 is not heated by steam, the curvature of the bimetal 40 is wide open to lift the float 10, and the orifice 61 of the valve seat 6 is opened as shown in FIG.

When the steam transfer of the piping system is started from this state, the initial air accumulated in the piping flows into the valve chamber 15 from the inlet 51 along the direction of arrow 91, but this initial air is opened. It is quickly exhausted from the orifice 61 through the valve seat space 62, the outlet passages 53, 54 and the outlet 55 along the direction of arrow 92. Further, the low temperature drain in the pipe is also drained from the same route through the outlet 55.

Since the check valve spaces 22a, 22b, and 22c are formed in the pressure receiving portion 21 of the check valve 2 (see FIG. 4), the check valve spaces 22a, 22b, and 22c are used for the initial air and low-temperature drain. Flows through. Therefore, the check valve 2 does not hinder the exhaust of the initial air and the drainage of the low temperature drain.

After the initial air is exhausted and the low-temperature drain is drained, high-temperature steam and drain flow into the valve chamber 15 in the direction of arrow 91. Then, when the temperature of the drain flowing into the valve chamber 15 rises and reaches a predetermined temperature, the bimetal 40 reacts with this to reduce the opening of the curve, and the contact of the bimetal 40 with the float 10 is released. After that, the bimetal 40 will not interfere with the float 10. As a result, the float 10 is seated and closes the orifice 61 of the valve seat 6. FIG. 5 shows this state, and the steam trap 1 starts normal operation from this state.

When the orifice 61 is closed, the water level of the drain that flows into and stays in the valve chamber 15 rises, and the float 10 gradually rises accordingly. Then, when the water level of the stagnant drain reaches the level L2 and the float 10 rises to the levitation position 96, the float 10 completely opens the orifice 61. When the orifice 61 is opened, the drain accumulated in the valve chamber 15 is drained at once along the direction of arrow 92 according to the force of high pressure in the pipe. Even in this case, the drain flows through the check valve spaces 22a, 22b, and 22c (FIG. 4) formed in the pressure receiving portion 21 of the check valve 2, so that the check valve 2 drains the drain. It does not become an obstacle.

The drainage of the drain lowers the water level of the drain that stays in the valve chamber 15, and when the level L1 is reached, the float 10 descends again and sits down to block the orifice 61 of the valve seat 6. Then, when the water level of the drain in the valve chamber 15 reaches the level L2 again, the float 10 that has surfaced opens the orifice 61 to drain the drain.

The steam trap 1 repeats the above operation and drains the drain as appropriate. During this operation, the water level of the drain staying in the valve chamber 15 changes back and forth between levels L1 and L2, but the orifice 61 is always submerged in the drain. Therefore, the steam transferred through the piping system does not leak, and the loss of steam can be avoided.

(Explanation when backflow occurs in steam trap 1)
When back pressure is generated on the discharge side of the steam trap 1, drain may flow back from the drain recovery pipe toward the valve chamber 15. When the drain flows back into the valve chamber 15, the steam transfer in the piping system is hindered. Therefore, in the present embodiment, the check valve 2 operates to prevent the drain from flowing back.

FIG. 6 is an enlarged cross-sectional view of the vicinity of the valve seat 6 when a backflow of drain occurs. Back pressure causes drain to enter the valve seat space 62 from the valve seat outlet 69 through the outlet passage 53 from the outlet 55 and the outlet passage 54 (FIGS. 1 and 5) and along the direction of arrow 93.

When the drain enters the valve seat space 62, the check valve 2 which has been in contact with the stopper 65 of the valve seat 6 and stands by, floats in the direction of arrow 101 while the pressure receiving pieces 21a, 21b, and 21c receive the backflow pressure. .. Then, when the check valve 2 moves to the limit position shown in FIG. 6, the spherical portion 28 of the check valve 2 closes the rear end portion of the orifice 61. This prevents backflow of drain into the valve chamber 15.

Further, when the check valve 2 moves to the limit position shown in FIG. 6, the spherical portion 28 closes the rear end portion of the orifice 61, and at the same time, the intrusion projection 25 of the check valve 2 penetrates into the orifice 61 and penetrates. To do. As a result, foreign matter adhering to the orifice 61 can be removed by the intrusion protrusion 25 at the opportunity of preventing the backflow of the drain, and the same effect as the cleaning operation can be obtained.

When the back pressure on the discharge side of the steam trap 1 is released and the backflow drain is properly drained to the drain recovery pipe, the check valve 2 retreats in the direction of arrow 102 to the position where it contacts the stopper 65 according to the drainage of the drain. Return to the state shown in 5.

(Explanation at the time of cleaning)
By the way, foreign matter such as fine dust and scale may flow into the valve chamber 15 through the mesh of the mesh cover 45 (FIG. 1), and this foreign matter may adhere to the orifice 61. When such foreign matter accumulates over time, the diameter of the orifice 61 is gradually reduced, drainage of the drain becomes insufficient, and finally the orifice 61 is completely blocked and the float 10 floats. However, the drain is not drained at all. Further, when a relatively large foreign substance adheres to the orifice 61, the drain may suddenly not be drained at all.

Therefore, if the drainage from the steam trap 1 becomes dull or if the drainage does not drain at all, it is judged that the orifice 61 may be clogged, and the cleaning bar is used as part of maintenance. Operate 3 to clean the orifice 61 of the valve seat 6. When cleaning, from the state shown in FIG. 5, a tool or the like is fitted into the operation groove 35 formed at the rear end of the cleaning bar 3 and rotated in the tightening direction. As a result, the cleaning bar 3 advances in the direction of arrow 101 via the screw mechanism.

By advancing the cleaning bar 3 in the direction of arrow 101, the cleaning pressing portion 31 enters the valve seat space 62 from the valve seat outlet 69. Then, the tip surface of the cleaning pressing portion 31 comes into contact with the rear end surface of the check valve 2 that has been waiting in contact with the stopper 65, and the cleaning pressing portion 31 points the check valve 2 to the arrow 101 according to the rotation operation of the cleaning bar 3. Push it up in the direction and force it to advance.

Since the thickness of the cleaning bar 3 is slightly smaller than the distance between the stoppers 65 fixed to the valve seat 6, the cleaning bar 3 is not restricted from moving by the stopper 65 and passes between the stoppers 65. You can advance in the direction of arrow 101.

FIG. 7 shows a state in which the cleaning bar 3 has advanced to the limit position in the direction of arrow 101. FIG. 7 is an enlarged cross-sectional view of the vicinity of the valve seat 6. The check valve 2 is pressed by the cleaning pressing portion 31 of the cleaning bar 3 and is located in the same state as when the drain flows back (FIG. 6), and the intrusion protrusion 25 forcibly penetrates the orifice 61. By penetrating the intrusion protrusion 25, foreign matter adhering to the inner surface of the orifice 61 is scraped off and pushed out from the orifice 61 toward the valve chamber 15.

After that, the tool or the like fitted in the operation groove 35 formed at the rear end of the cleaning bar 3 is rotated in the loosening direction, the cleaning bar 3 is retracted in the direction of arrow 102, and the cleaning bar 3 is restored to the state shown in FIG. As the cleaning bar 3 retracts in the direction of arrow 102, the check valve 2 retracts in the direction of arrow 102 due to its own weight, and the check valve 2 also returns to the state shown in FIG.

Foreign matter pushed out from the orifice 61 to the valve chamber 15 side by the intrusion protrusion 25 of the check valve 2 is discharged into the drain recovery pipe together with the drain according to the force of the drainage when the drain is drained during the normal operation of the steam trap 1. It is discharged toward.

[Second Embodiment]
Next, a second embodiment of the automatic valve having the check flow prevention mechanism and the cleaning mechanism according to the present application will be described. The basic configuration, initial state, normal operation, backflow, or cleaning operation of the steam trap in the present embodiment are the same as those in the first embodiment.

FIG. 8 is an enlarged cross-sectional view of the vicinity of the valve seat 6 in the present embodiment. In the present embodiment, the check valve 7 is provided in the valve seat 6. The point that the check valve 7 is composed of the pressure receiving portion 71, the spherical surface portion 78, and the intrusion protrusion 75 is the configuration of the check valve 2 in the first embodiment (pressure receiving portion 21, spherical surface portion 28, and intrusion protrusion 25). ), But the check valve 7 in the present embodiment is further formed with a check valve recess 70 on the rear end surface.

On the other hand, also in this embodiment, the same cleaning bar as the cleaning bar 3 shown in the first embodiment is provided, but the cleaning pressing portion 81 located on the tip side is pressed and convex on the tip surface. A part 80 is provided. The pressing convex portion 80 has a shape that fits into the check valve recess 70 formed on the rear end surface of the check valve 7.

In the present embodiment, when cleaning the orifice 61, a tool or the like is fitted into the operation groove formed at the rear end of the cleaning bar and rotated to operate the cleaning bar, as in the case of the first embodiment. The portion 81 is advanced in the direction of arrow 101 and is brought into contact with the rear end surface of the check valve 7. At this time, the pressing convex portion 80 of the cleaning pressing portion 81 fits into and is coupled to the check valve concave portion 70 formed on the rear end surface of the check valve 7. As a result, the cleaning pressing portion 81 can be pushed up more reliably while rotating the check valve 7.

After that, as in the first embodiment, the intrusion protrusion 75 of the check valve 7 pushed up by the cleaning pressing portion 81 penetrates the orifice 61, scrapes off the foreign matter adhering to the inner surface of the orifice 61, and pushes it out. After that, the tool or the like fitted in the operation groove formed at the rear end of the cleaning bar is rotated in the reverse direction, and the cleaning bar is retracted in the direction of arrow 102 to be restored. As the cleaning bar 3 retracts in the direction of arrow 102, the check valve 7 retreats in the direction of arrow 102 due to its own weight and returns to its original position.

[Other Embodiments]
In the above embodiment, an example is shown in which an automatic valve having a backflow prevention mechanism and a cleaning mechanism according to the present application is applied to a float type steam trap, but the present invention is not limited to this, and the automatic valve is provided in a path through which a fluid passes. Any automatic valve that controls the flow direction, pressure, and flow rate can be applied to other equipment. In each of the above-described embodiments, a float type steam trap, which is a type of mechanical steam trap, has been described as an example, but the backflow prevention mechanism and the cleaning mechanism according to the present application are used for other types of steam traps. It is also possible to apply an automatic valve having.

Further, in the above-described embodiment, the spherical portions 28 and 78 are exemplified as the closing portions, but other shapes as long as they move in response to the backflow of the drain (fluid) and block the orifice 61 (inflow portion). , The structure may be adopted.

Further, in the above-described embodiment, the intrusion protrusions 25 and 75 are illustrated as the intrusion portion, but other shapes and structures may be adopted as long as they invade the orifice 61 (inflow portion) during the cleaning operation. ..

In addition, in order to avoid the risk of damage to the float 10 during the cleaning operation and prevention of backflow, the tips of the intrusion protrusions 25 and 75 may be formed of a soft member such as rubber. Further, the protrusion lengths of the intrusion protrusions 25 and 75 shown in the above embodiment are formed short, and when the check valves 2 and 7 advance to the limit position, the intrusion protrusions 25 and 75 do not penetrate to the tip side of the orifice 61. It can also be configured to avoid collision with the float 10 and avoid damage to the float 10.

In the above embodiment, the cleaning bar 3 and the cleaning pressing portions 31 and 81 are exemplified as the cleaning portion, but the present invention is not limited to this, and the check valve 2 (check valve) when the cleaning operation is performed from the outside. If the check valve 2 is advanced toward the orifice 61 (inflow part) and the intrusion protrusions 25 and 75 (intrusion part) are allowed to enter the orifice 61, other shapes and structures may be adopted. Good.

Further, in the second embodiment, an example is shown in which the pressing convex portion 80 is formed in the cleaning pressing portion 81 and the check valve concave portion 70 is formed in the check valve 7, but conversely, the cleaning pressing portion 81 is formed. A concave portion may be formed, and a convex portion may be formed on the check valve 7. Further, the shapes of the concave portion and the convex portion are not limited to those illustrated, and other shapes may be adopted as long as they can be combined.

Further, the coupling means is not limited to the fitting mechanism shown in the second embodiment, and is provided on either or both of the cleaning pressing portion 81 (cleaning portion) and the check valve 7 (check valve). , Another mechanism can be used as long as the cleaning pressing portion 81 presses the check valve 7 to connect the two. For example, a metal portion and a magnet can be used to bond them by magnetic force.

1: Steam trap 2, 7: Check valve 3: Cleaning bar
22a, 22b, 22c: Check valve space 25, 75: Intrusion protrusion 28, 78 Spherical part
31, 81: Cleaning pressing part 61: Orifice 62: Valve chamber space
69: Valve seat outlet 70: Check valve concave part 80: Pressing convex part

Claims (3)

An operating flow path that has an inflow part and an outflow part and allows the fluid that has flowed in from the inflow part to flow out from the outflow part.
A backflow prevention valve that is movably located in the working flow path and has a closing part that closes the inflow part and an invading part that invades the inflowing part, and is in the initial state or the fluid flows from the inflowing part. When it flows into the road, it evacuates from the inflow part and opens the inflow part, and when the fluid flows back from the outflow part into the operating flow path, it receives the backflow and advances toward the inflow part and flows in by the closed part. Backflow prevention valve that closes the part,
It is a cleaning unit that is located toward the operating flow path and can be operated from the outside of the operating flow path. When the cleaning operation is performed from the outside, it works on the check valve to advance the check valve toward the inflow section. Cleaning unit that allows the intrusion part to enter the inflow part,
An automatic valve having a backflow prevention mechanism and a cleaning mechanism. In the automatic valve having the check flow prevention mechanism and the cleaning mechanism according to claim 1.
When the cleaning unit is cleaned from the outside, it presses the check valve to advance the check valve toward the inflow section.
A coupling means is formed on either one or both of the cleaning portion and the check valve when the cleaning portion presses the check valve.
An automatic valve having a backflow prevention mechanism and a cleaning mechanism. In an automatic valve having a backflow prevention mechanism and a cleaning mechanism according to claim 1 or 2.
The check valve is formed with a passage space for passing the fluid flowing in from the inflow portion toward the outflow portion.
An automatic valve having a backflow prevention mechanism and a cleaning mechanism.

Images