WO2016080013A1

WO2016080013A1 - Cone valve

Info

Publication number: WO2016080013A1
Application number: PCT/JP2015/069024
Authority: WO
Inventors: 広樹神野; 徹朗後藤; 伊藤　幹; 徹北崎
Original assignee: 住友金属鉱山株式会社
Priority date: 2014-11-21
Filing date: 2015-07-01
Publication date: 2016-05-26

Abstract

The purpose of the invention is to allow the lifespan of a cone valve to be extended over conventional ones even if used as a check valve when feeding slurry containing highly abrasive coarse particles. A cone valve (1) used as a check valve when feeding slurry comprises at least a valve body (11), a valve seat (13), and a spring (14) incorporated so as to bring the valve body (11) in contact with the valve seat (13). The total length of the spring (14) is less than the stroke length of the valve body (11).

Description

Cone valve

The present invention relates to a cone valve for preventing backflow when a fluid is fed. Specifically, when feeding ore slurry containing hard coarse particles, for example obtained by pretreatment of nickel oxide ore, it is used to prevent backflow, suppresses the occurrence of defects due to wear, and life It is related with the cone valve which can be extended. This application is based on Japanese Patent Application No. 2014-236461 filed on November 21, 2014 in Japan and Japanese Patent Application No. 2015-003105 filed on January 9, 2015. And these applications are hereby incorporated by reference into the present application.

Nickel oxide ore was difficult to use as a nickel resource because of its low nickel content. However, a hydrometallurgical method using high-pressure acid leaching technology has been developed, and for example, nickel-cobalt mixed sulfide (nickel grade is about 60 wt%) can be produced economically (for example, see Patent Document 1). .

As an example of the hydrometallurgical method of nickel oxide ore, first, an ore slurry is prepared from ore having a predetermined particle size, and the resulting slurry is supplied to a high-temperature and high-pressure autoclave. The nickel and cobalt mixed sulfides are produced by leaching and lowering the temperature to reduce unnecessary substances such as leaching residues to obtain a leachate and sulfiding.

The ore slurry is prepared with a solid content of about 20 to 40 g / L (see FIG. 9), a solid particle size of about 2 mm or less (for example, see Patent Document 2), a temperature of about 250 ° C., and a pressure of 3.5. It is supplied to a high-temperature and high-pressure autoclave of up to 4.0 MPaG, and mineral acid for leaching, air for promoting oxidation, steam for maintaining temperature, etc. are supplied together, and stirring by a stirrer is performed, so that leaching is performed. proceed.

In order to supply the ore slurry into the autoclave, it is necessary to increase the pressure to a pressure higher than at least the above pressure, and the ore slurry produced at atmospheric pressure and the temperature of the plant environment is usually heated stepwise by various means. The pressure is increased (see, for example, Patent Document 3).

In the initial stage, for example, a combination of a heat exchanger and a general liquid feed pump is used to simultaneously raise the temperature while raising the temperature to a state of about 200 ° C. and a pressure of about 1.5 MPaG. The pressure is increased to 4.0 MPaG or more to push the pressure into the autoclave.

The devices used in the final pressurizing step are generally a diaphragm type pump and a cone valve type check valve. This type is used because a necessary amount of ore slurry (about 240 m ³ / Hr) can be continuously supplied into an autoclave under high temperature and high pressure conditions.

In particular, when the pressure is increased under severe conditions (1.5 MPaG → 4.0 MPaG) as described above, a strong cone coil coil spring is generally used in order to suppress the backflow of the slurry. Similarly, in order to suppress the backflow of the slurry, the contact surface between the valve body of the cone valve and the valve seat has a curvature as shown in FIG. Contact).

However, the ore slurry is subjected to sieving so that the solids particle size is 1-2 mm, more preferably 1.4 mm or less. At this time, even if there are no particles coarser than 1.4 mm, a slight back flow always occurs, and local wear proceeds due to slight damage to the valve body due to the impact when the cone valve is closed. To do. In particular, either one of the contact surfaces of the valve body and the valve seat is curved and curved so that the contact area between the valve body and the valve seat is small, so that the slurry is caught when the cone valve is closed. Sometimes it is easy to pass through and wear of the curved part is generated from the point through.

As a result, the space to be partitioned by the contact surface between the valve body and the valve seat may be extremely communicated, and there is a problem that a predetermined discharge amount cannot be maintained.

When such a problem occurs, it is necessary to judge the life of the part, stop the operation and replace the worn part, and not only the operation efficiency is lowered but also the cost required for the replacement part cannot be ignored.

In particular, the problem of reduced operational efficiency is that if the life of a part can be maintained until the time when the plant is systematically stopped and inspected and maintained every 6 months (≈4380 hours), the part will be systematically adjusted to that timing. It's not a big problem because it only needs to be exchanged.

However, since the flow rate decreases due to wear, often from 200 hours to 350 hours (about 8 to 15 days), it is necessary to extend the life.

In simple terms, it is conceivable to completely remove particles close to the upper limit of 1 to 2 mm, which are likely to damage the valve body, or particles larger than this which are mixed due to breakage of the sieving equipment. An attempt to completely remove this is not practical because it causes a dramatic increase in cost.

It is also easy to recall that the amount of slurry passing through the cone valve (about 40 m ³ / Hr / 1 valve at 60% stroke operation) and reducing the wear of parts is maintained, but the overall production of the plant is maintained. In order to achieve this, the number of slurry feeding lines must be increased, which is not preferable because of the high investment cost.

Also, the technology of making parts difficult to wear also increases costs. Further, a technique using a component that sacrifices wear is not preferable in that the valve structure becomes complicated and maintenance time increases.

For example, Patent Document 4 describes a technique for extending the life of a check valve when a slurry of hard particles is fed.

However, the valve structure is complicated in the same manner as described above, that is, a technique using an annular valve seat or an annular packing made of a highly durable material to form the valve seat surface, and the valve body is a ceramic sphere. It cannot be applied to the above problem.

JP-A-2005-350766 JP 2009-173967 A JP 2010-025455 A JP 2006-214539 A

The present invention has been made to solve such a situation, and even if it is used as a check valve when feeding a slurry containing coarse particles having high wear properties, the service life is extended more than ever. An object of the present invention is to provide a cone valve that can be used.

The present inventors have intensively studied the strength of the spring, the shape of the cone valve, etc., and reached the conclusion that the spring is not necessary for prevention of backflow, but should be able to prevent sticking due to catching, and the length of the spring. By shortening the cone valve, the impact when closing the cone valve is weakened, and further, by smoothing the contact surface that was in line contact, the impact is distributed and the valve body or valve seat that triggers local wear It has been found that the above-mentioned problems can be solved by reducing the damage caused by the impact.

A cone valve according to the present invention is a cone valve used as a check valve when feeding slurry, and is incorporated so that at least the valve body, the valve seat, and the valve body are in contact with the valve seat. And the total length of the spring is at least shorter than the stroke length of the valve body.

Furthermore, the slurry is preferably a nickel oxide ore slurry.

Furthermore, the shape of the portion where the valve body and the valve seat come into contact is preferably flat.

Even if the cone valve according to the present invention is used as a check valve when feeding a slurry containing coarse particles having high wear properties, the lifetime can be extended as compared with the conventional one. Have.

FIG. 1 is a schematic view showing an example of use of a cone valve according to the present invention. FIG. 2 is a cross-sectional perspective view showing an example of a cone valve according to the present invention. FIG. 3 is a cross-sectional front view illustrating an example of a closed cone valve in which a valve body and a valve seat are in contact with each other. FIG. 4 is a cross-sectional front view showing an example of an open cone valve in which the valve body and the valve seat are separated from each other. FIG. 5 is a schematic view showing a flat contact surface of a cone valve according to the present invention. FIG. 6 is a schematic view showing a curved contact surface of a cone valve according to the present invention. FIG. 7 is a cross-sectional front view showing another example of the closed cone valve in which the valve body and the valve seat are in contact with each other. FIG. 8 is a cross-sectional front view showing another example of an open cone valve in which the valve body and the valve seat are separated from each other. FIG. 9 is a table illustrating the properties of the ore slurry.

Hereinafter, the cone valve according to the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following examples, In the range which does not deviate from the summary of this invention, it can change arbitrarily.

<Description of First Embodiment>
The cone valve 1 according to the present invention is a slurry containing coarse particles (particle maximum diameter is 1 to 2 mm) having high wear properties, for example, when ore slurry obtained by pretreatment of nickel oxide ore is fed. A cone valve that is used as a check valve when feeding liquid, and is installed in a liquid feeding device 100 as shown in FIG. 1, for example.

As shown in FIG. 1, the liquid delivery apparatus 100 includes an upstream side slurry tank 101, a downstream side slurry tank 102, and a diaphragm pump 103. The upstream side slurry tank 101 and the downstream side slurry tank 102 are connected by a first pipe 104. The diaphragm pump 103 is connected to the first pipe 104 through the second pipe 105. One cone valve 1 is installed in the first pipe 104a between the connecting part 106 between the first pipe 104 and the second pipe 105 and the upstream side slurry tank 101 (upstream side cone valve 1a). One is installed in the first piping 104b between 106 and the downstream side slurry tank 102 (downstream side cone valve 1b).

Then, when the diaphragm portion of the diaphragm pump 103 moves to the right (one side) and sucks, the liquid feeding device 100 opens the upstream cone valve 1a and closes the downstream cone valve 1b. As indicated by a solid arrow A, slurry is supplied to the diaphragm pump 103 from the upstream tank (pressure ≈ 1.5 MPaG) 101.

On the other hand, when the diaphragm portion of the diaphragm pump 103 moves to the left (the other side) and exhales, the liquid delivery device 100 has the upstream cone valve 1a closed and the downstream cone valve 1b opened. As indicated by a dotted arrow B in the middle, slurry is supplied from the diaphragm pump 103 to the downstream tank (pressure ≧ 4.0 MPaG).

In other words, the cone valve 1 is configured such that when the slurry containing coarse particles having high wearability is fed, the diaphragm portion of the diaphragm pump 103 is left and right (high and low pressure (1.5 MPaG to 4.0 MPaG)). With the repeated movement to one or the other, the open / close state is repeatedly switched.

Specifically, as shown in FIGS. 2, 3, and 4, the cone valve 1 includes at least a valve portion 10 having a valve body 11, a main body portion 12 having a valve seat 13, and the valve body 11 as a valve seat. 13 and a spring 14 incorporated so as to come into contact with 13.

As shown in FIG. 3, the valve portion 10 includes a columnar rod member 10 a and a valve body 11 projecting from one end of the rod member 10 a toward the outside in the radial direction of the rod member 10 a. The valve portion 10 is accommodated in the main body portion 12 so as to be movable along the axial direction of the main body portion 12 while disposing the valve body 11 on one end side of the main body portion 12 relative to the valve seat 13.

As shown in FIG. 3, the main body portion 12 has an insertion portion 15 in which the slurry is inserted and the valve portion 10 is accommodated, and is formed in a cylindrical shape. Furthermore, a valve seat 13 that protrudes toward the inner side in the radial direction of the main body 12 and contacts the valve body 11 is formed in the middle of the insertion portion 15.

Moreover, as shown in FIG. 5, the shape of the contact surfaces 11a and 13a with which the valve body 11 of the valve part 10 and the valve seat 13 of the main-body part 12 contact is formed so that cross-sectional shape is linear flat. Yes. Specifically, the contact surface 11a of the valve body 11 and the contact surface 13a of the valve seat 13 are flat inclined surfaces that gradually increase in diameter from the other end side of the main body portion 12 toward one end side, Provided in parallel and in surface contact. Therefore, since the valve body 11 and the valve seat 13 have a large contact area, even if the slurry is caught when the cone valve 1 is closed, the valve body 11 and the valve seat 13 are difficult to pass through, so that local wear hardly occurs.

In addition, you may form so that the shape of the contact surface 11a of the valve body 11 may be curvilinear and curved as shown in FIG. Further, the shape of the contact surface 13a of the valve seat 13 may be formed to be curved and curved. That is, the shape of one of the contact surface 11a of the valve body 11 and the contact surface 13a of the valve seat 13 is formed to be curved and curved so that the valve body 11 and the valve seat 13 are in point contact (actually, (Circle contact). Furthermore, you may form so that the shape of both the contact surface 11a of the valve body 11 and the contact surface 13a of the valve seat 13 may be curved and curved.

Further, as shown in FIG. 3, a sliding support member 16 that slidably supports the valve portion 10 is attached in the other end region 15 a on the other end side of the main body portion 12. The sliding support member 16 is formed in an annular shape, and is fitted in the fitting portion 17 fitted to the inner peripheral surface of the other end region 15 a of the main body portion 12. Is formed between the fitting portion 17 and the sliding support portion 18, and the fitting portion 17 and the sliding support portion are slidably supported. It has the connection part 19 which connects the part 18. FIG. The sliding support portion 18 is configured to slidably support the valve portion 10 via a sliding member 20 formed of, for example, a material having low friction and excellent sliding properties disposed inside. Alternatively, the valve portion 10 may be directly slidably supported. Further, a spring 14 is disposed on the outer peripheral surface of the sliding support portion 18 on the other end side than the connecting portion 19.

Further, as shown in FIG. 3, an abutting portion 21 with which the spring 14 abuts is attached to the other end portion of the valve portion 10. The abutting portion 21 is formed in a cylindrical shape, and the other end portion of the valve portion 10 is inserted therein, and is detachably attached to the other end portion of the valve portion 10 by a fixing member 22 such as a wedge member. ing. Therefore, the contact portion 21 moves in the main body portion 12 as the valve portion 10 moves along the axial direction of the main body portion 12. Further, a flange portion 23 is formed on the outer peripheral surface of the contact portion 21 so as to protrude outward in the radial direction of the contact portion 21. Further, the contact portion 21 has a spring 14 disposed on the outer peripheral surface on one end side of the flange portion 23. Note that the contact portion 21 may be attached by bonding, welding, or the like without using the fixing member 22.

As shown in FIG. 4, the spring 14 is, for example, a coil spring, and is disposed on the outer peripheral surface of the sliding support member 16 of the main body 12 and the outer peripheral surface of the contact portion 21 of the valve portion 10, and one end thereof is the main body. 12 is connected to the other end surface 19 a of the connecting portion 19, and the other end is in contact with one end surface 23 a of the flange portion 23 of the contact portion 21, so that the valve body 11 is arranged on one end side of the valve seat 13. The valve portion 10 is urged toward the other end side of the main body portion 12 so as to be in contact with the valve seat 13.

Further, as shown in FIG. 3, the total length of the spring 14 is formed to be at least shorter than the stroke length of the valve body 11 (valve portion 10).

Specifically, as shown in FIG. 3, the total length (free height) L1 of the spring 14 is in contact with the other end surface 19a of the connecting portion 19 in the closed state in which the valve body 11 and the valve seat 13 are in contact. 21 is formed so as to be shorter than a stroke length L2 which is a length between one end surface 23a of the flange portion 23. As an example, the total length (free height) L1 of the spring 14 is 155 mm, and the stroke length L2 is 161 mm. Therefore, as shown in FIG. 4, the spring 14 is bent in the compression direction, and in the open state in which the valve body 11 is separated from the valve seat 13, the spring 14 has a free height and the valve body 11 is close to the valve seat 13. Until then, the valve portion 10 is urged toward the other end side of the main body portion 12. On the other hand, the spring 14 has a free height as shown in FIG. 3, and when the valve body 11 is close to or in contact with the valve seat 13, the valve portion 10 is moved to the main body portion 12. It does not urge toward the other end side. After that, the valve body 11 is not urged by the spring 14 due to an inertial force due to the urging of the spring 14 and a pressure difference between the other end region 15a and the one end region 15b of the main body 12 and the like. 13 abuts.

Further, as shown in FIG. 4, the total length (height at the allowable load) L3 when the spring 14 is bent to the maximum in the compression direction is the other end surface 19a of the connecting portion 19 and the other end surface 16a of the sliding support member 16. It is formed to be longer than the guide length L4 between. Thereby, no matter how much the spring 14 bends in the compression direction, it protrudes to the other end side from the other end surface 16a of the sliding support member 16, and the contact portion 21 of the valve portion 10 and the sliding support member 16 Are prevented from coming into contact with each other, and the valve body 11 and the sliding support member 16 are prevented from being stuck and stuck.

The cone valve 1 having the above-described configuration is resistant to the urging force of the spring 14 when fluid pressurized to a predetermined value or more is fed from the other end side of the main body 12 toward the one end side. The valve body 11 is pushed up to one end side of the main body portion 12, the valve body 11 is separated from the valve seat 13, and the fluid is directed from the other end region 15 a on the other end side of the main body portion 12 toward the one end region 15 b on one end side. Shed.

On the other hand, the cone valve 1 pushes the valve body 11 down to the other end side of the main body portion 12 while being assisted by the spring 14 when the pressure at one end side of the main body portion 12 is larger or larger than the other end side. The valve body 11 is brought into contact with the valve seat 13, the insertion part 15 is covered with the valve body 11, and the other end region 15 a on the other end side of the main body 12 and the one end region 15 b on the one end side are shut off. The fluid is prevented from flowing backward from the one end region 15b of the main body 12 toward the other end region 15a.

Here, the inventors described the cause of the malfunction of the cone valve, that is, the cause of the valve seat or the valve body being worn and the upstream side and the downstream side of the cone valve communicating with each other as follows. I guessed. When the cone valve changes from the open state to the closed state, highly wearable particles inevitably contained in the slurry are caught in the gap between the valve seat and the valve body, and either surface is damaged. Depending on the size of the scratch and the position where the scratch is attached, the scratch gradually grows by opening and closing repeatedly (about 1908 times / Hr when the stroke is 60%), and the slurry can flow backward at a certain point. It becomes a flow path, and communication begins between the upstream side and the downstream side of the cone valve through this scratch. After that, the slurry always flows through the gap between the valve seat and the valve body, and wear progresses. Finally, a large communication part is formed, and the liquid feeding efficiency of the slurry is extremely lowered, and parts must be replaced. It will be in an unobtainable state.

Further, the present inventors presume that the extent of scratching is affected by the period until parts replacement is necessary, and the cause of the severe damage is the strength of the spring. I found That is, the strength of the spring is set to a relatively strong level in an attempt to suppress the backflow, and this strength causes the cone valve to be closed and at the same time sandwiches highly wearable particles. Sometimes, if the spring is too strong, the degree of scratching becomes deeper and worse.

Therefore, the present inventors have come to the conclusion that it is sufficient that the function of the spring in this cone valve can prevent sticking due to catching.

As described above, the cone valve 1 reduces the impact at that time even if coarse particles are caught when the cone valve 1 is closed by making the total length L1 of the spring 14 shorter than the stroke length L2 of the valve body 11. In addition, damage to the valve body 11 or the valve seat 13 that triggers uneven wear can be prevented and the degree of scratches can be mitigated, so that the life can be maintained two to three times the conventional life. .

The stroke length means a length in a state where the spring 14 in FIG. 3 is incorporated. Conventionally, when the valve body 11 and the valve seat 13 are assembled so as to come into contact with each other, the spring 14 is fitted in a stroke length (for example, 161 mm) shorter than a natural length (for example, 188 mm), and the valve body 11 Even in a state where the valve seat 13 is in contact with the valve seat 13, the repulsive force of the spring 14 works and the valve body 11 is pressed against the valve seat 13. For this reason, conventionally, when coarse particles are sandwiched when the cone valve is closed, the impact becomes stronger by the repulsive force. On the other hand, in the present invention, the natural length of the spring 14 is shorter than the stroke length (for example, 155 mm). For this reason, the repulsive force does not work, and even when coarse particles are sandwiched when the cone valve is closed, the impact can be reduced by the repulsive force.

Further, the cone valve 1 has a flat shape of the contact surfaces 11a and 13a where the valve body 11 and the valve seat 13 come into contact with each other, so that coarse particles may be sandwiched when the cone valve 1 is closed. Since the impact can be dispersed and the damage of the valve body 11 or the valve seat 13 that triggers uneven wear can be prevented and the degree of scratches can be further relaxed, the life is nearly five times that of the conventional life. be able to.

Further, the cone valve 1 can be suitably applied if it is a slurry containing coarse particles having a high wear resistance (particle maximum diameter of 1 to 2 mm), and in particular, an ore obtained by treating nickel oxide ore. If it is a slurry, it can be applied particularly effectively.

Next, examples to which the present invention is applied will be described, but the present invention is not limited to the following examples.

The cone valves of Example 1, Example 2 and Comparative Example 1 below were each installed in a liquid delivery device as shown in FIG.

The common conditions are as follows.
・ Slurry Solid content: Nickel oxide ore (slurry with a maximum particle size of 1 to 2 mm)
Solid content concentration: 30 g / L
・ Slurry feed rate: about 240m ³ / Hr (60% stroke operation, 2 units operation)
・ Cone valve stroke length: 161 mm

-Size of spring used in Example and Comparative Example (Example): Free length 155mm
(Comparative example): Free length 188mm

(Example 1)
In Example 1, a cone valve having a curved and curved contact surface in contact with the valve seat of the main body of the valve body as shown in FIG. 6 is installed in the liquid feeding device as shown in FIG. Then, the slurry was fed. As a result, the cone valve of Example 1 did not have any problems even after 645 hours of operation.

(Example 2)
In the second embodiment, a cone valve having the same configuration as that of the first embodiment except that the shape of the portion where the valve body of the valve portion and the valve seat of the main body portion are in contact with each other is linear and flat as shown in FIG. 1 and installed in a liquid feeding apparatus as shown in FIG. 1 to feed the slurry. As a result, the cone valve of Example 2 did not fail even after 968 hours of operation.

(Comparative Example 1)
In Comparative Example 1, a cone valve having the same configuration as that of Example 1 except that the size of the spring was different was installed in a liquid feeding device as shown in FIG. 1, and the slurry was fed. As a result, the cone valve of Comparative Example 1 had a problem in 200 hours and had to be replaced.

From the above, according to Example 1, it is possible to maintain a life three times or longer than the conventional life (Comparative Example 1). Furthermore, according to Example 2, it can be seen that the life of nearly five times that of the conventional (Comparative Example 1) can be maintained, and can be used for one month (≈720 hours) or longer.

<Description of Second Embodiment>
In the cone valve 1 of the first embodiment, the valve body 11 is disposed on one end side with respect to the valve seat 13, the spring 14 is disposed on the other end side, and the valve body 11 and the spring 14 are different from the valve seat 13. Although arranged in the direction, in the cone valve 31 of the second embodiment, the valve body 41 and the spring 44 are arranged in the same direction with respect to the valve seat 43.

Specifically, as shown in FIGS. 7 and 8, the cone valve 31 includes at least a valve portion 40 having a valve body 41, a main body portion 42 having a valve seat 43, and the valve body 41 in contact with the valve seat 43. And a spring 44 incorporated therein.

As shown in FIG. 7, the valve portion 40 includes cylindrical first and

second rod members

40a and 40b, and first and second rod members 40a between the first and

second rod members

40a and 40b. , 40b and a valve body 41 projecting outward in the radial direction. In the valve portion 40, the first rod member 40 a is slidably accommodated in the first guide portion 46 of the main body 42 while the valve body 41 is disposed on one end side of the main body 42 relative to the valve seat 43. In addition, the second bar member 40b is slidably accommodated in the second guide portion 47 of the main body portion 42, and is accommodated in the main body portion 42 so as to be movable along the axial direction of the main body portion 42. .

As shown in FIG. 7, the main body portion 42 has an insertion portion 45 in which the slurry is inserted and the valve portion 40 is accommodated, and is formed in a cylindrical shape. For example, the insertion portion 45 is formed in a substantially L shape so that a bottom surface opening 45 c formed on the bottom surface 42 a of the main body 42 communicates with a side surface opening 45 d formed on the side surface. Furthermore, a valve seat 43 that protrudes toward the inside in the radial direction of the main body 42 and contacts the valve body 41 is formed in the middle portion of the insertion portion 45 on the bottom surface 42 a side.

Moreover, the shape of the contact surfaces 41a and 43a with which the valve body 41 of the valve part 40 and the valve seat 43 of the main-body part 42 contact is respectively similar to the cone valve 1 of 1st embodiment, as shown in FIG. The cross-sectional shape is linearly flat. Specifically, the contact surface 41a of the valve body 41 and the contact surface 43a of the valve seat 43 are flat inclined surfaces that gradually increase in diameter from the other end side of the main body portion 42 toward one end side, Provided in parallel and in surface contact. Therefore, since the valve element 41 and the valve seat 43 have a large contact area, even if the slurry is caught when the cone valve 31 is closed, it is difficult for the valve element 41 and the valve seat 43 to pass through.

In addition, you may form so that the shape of the contact surface 41a of the valve body 41 may be curved and curved like the cone valve 1 of 1st embodiment, as shown in FIG. Further, the shape of the contact surface 43a of the valve seat 43 may be formed to be curved and curved. That is, the shape of either the contact surface 41a of the valve body 41 or the contact surface 43a of the valve seat 43 is formed to be curved and curved so that the valve body 41 and the valve seat 43 are in point contact (actually, (Circle contact). Furthermore, the shapes of both the contact surface 41a of the valve body 41 and the contact surface 43a of the valve seat 43 may be formed to be curved and curved.

Further, as shown in FIG. 7, a cylindrical first guide portion 46 that slidably supports the valve portion 40 is formed on the bottom surface 42 a side of the main body portion 42. The first guide portion 46 is disposed in the other end region 45a on the other end side of the main body portion 42 through a connecting portion (not shown) and the like, and is coaxial with the central axis of the bottom surface opening 45c of the main body portion 42. The first rod member 40a is inserted inside and supports the valve portion 40 so as to be slidable.

Further, as shown in FIG. 7, a cylindrical second guide portion 47 that slidably supports the valve portion 40 is formed on the inner wall surface of the upper surface 42 b of the main body portion 42. The second guide portion 47 is disposed in one end region 45b on the one end side of the main body portion 42 and is disposed coaxially with the first guide portion 46, and the second rod member 40b is inserted into the valve portion so that the valve The part 40 is slidably supported. Further, a spring 44 is disposed on the outer peripheral surface of the second guide portion 47.

As shown in FIG. 8, the spring 44 is, for example, a coil spring, and is disposed on the outer peripheral surface of the second guide portion 47 of the main body portion 42, and one end thereof is in contact with the inner wall surface of the upper surface 42 b of the main body portion 42. The valve portion 40 of the main body portion 42 is arranged such that the other end portion is in contact with the valve body 41 of the valve portion 40 and the valve body 41 disposed on one end side with respect to the valve seat 43 is in contact with the valve seat 43. Energize toward the other end.

Further, as shown in FIG. 7, the total length of the spring 44 is formed to be at least shorter than the stroke length of the valve body 41 (valve portion 40).

Specifically, as shown in FIG. 7, the total length (free height) L31 of the spring 44 is equal to the inner wall surface of the upper surface 42b of the main body 42 and the valve in the closed state where the valve body 41 and the valve seat 43 are in contact. It is formed to be shorter than the stroke length L32 which is the length between the valve body 41 of the portion 40. As an example, the total length (free height) L31 of the spring 44 is 155 mm, and the stroke length L32 is 161 mm. Therefore, as shown in FIG. 8, the spring 44 is bent in the compression direction and becomes a free height in the open state in which the valve body 41 is separated from the valve seat 43, and the valve body 41 is close to the valve seat 43. Until then, the valve portion 40 is urged toward the other end side of the main body portion 42. On the other hand, as shown in FIG. 7, the spring 44 has a free height, and when the valve body 41 is close to or in contact with the valve seat 43, the valve portion 40 is moved to the main body portion 42. It does not urge toward the other end side. After that, the valve body 41 is not urged by the spring 44 due to an inertial force due to the urging of the spring 44 and a pressure difference between the other end region 45a and the one end region 45b of the main body 42, and the like. 43 abuts.

As shown in FIG. 8, the total length (allowable load height) L <b> 33 when the spring 14 is bent to the maximum in the compression direction is the inner wall surface of the upper surface 42 b of the main body portion 42 and the second guide portion 47. It is formed to be longer than the length L34 between the other end surface 47a. Thereby, no matter how much the spring 44 bends in the compression direction, it protrudes to the other end side from the other end surface 47a of the second guide portion 47, and the valve body 41 and the second guide portion 47 come into contact with each other. This prevents the valve body 41 and the second guide portion 47 from being stuck and stuck.

As with the cone valve 1 of the first embodiment, the cone valve 31 having the above-described configuration is fed with fluid pressurized to a predetermined value or more from the other end side of the main body portion 42 toward the one end side. The valve body 41 is pushed up to one end side of the main body portion 42 against the urging force of the spring 44, the valve body 41 is separated from the valve seat 43, and the fluid is supplied to the other end on the other end side of the main body portion 42. It flows from the region 45a toward the one end region 45b on one end side.

On the other hand, in the same manner as the cone valve 1 of the first embodiment, the cone valve 31 is assisted by the spring 44 when the pressure at one end side of the main body portion 42 is larger or larger than the other end side. 41 is pushed down to the other end side of the main body portion 42, the valve body 41 is brought into contact with the valve seat 43, the insertion portion 45 is covered with the valve body 41, and the other end region on the other end side of the main body portion 42. 45a and the one end region 45b on one end side are blocked, and the fluid is prevented from flowing backward from the one end region 45b of the main body 42 toward the other end region 45a.

As described above, the cone valve 31 has a coarse particle size when the cone valve 1 is closed by making the total length L31 of the spring 44 shorter than the stroke length L32 of the valve body 41, like the cone valve 1 of the first embodiment. Can be reduced, and the damage to the valve body 41 or the valve seat 43 that triggers uneven wear can be prevented and the degree of scratches can be reduced. Compared to 2 to 3 times the service life.

Further, like the cone valve 1 of the first embodiment, the cone valve 31 has a

flat contact surface

41a, 43a where the valve body 41 and the valve seat 43 are in contact with each other, so that the cone valve 31 is closed. Even if coarse particles are sometimes sandwiched, the impact at that time can be dispersed, and damage to the valve body 41 or the valve seat 43 that triggers uneven wear can be prevented, and the degree of scratches can be further eased. It is possible to maintain a life nearly 5 times longer than the conventional life.

Furthermore, as with the cone valve 1 of the first embodiment, the cone valve 31 can be suitably applied as long as it is a slurry containing coarse particles having a high wear property (particle maximum diameter is 1 to 2 mm). In particular, an ore slurry obtained by treating nickel oxide ore can be applied particularly effectively.

1 cone valve, 1a upstream cone valve, 1b downstream cone valve, 10 valve part, 10a rod member, 11 valve body, 11a contact surface, 12 body part, 13 valve seat, 13a contact surface, 14 spring, 15 insertion part 15a other end region, 15b one end region, 16 sliding support member, 16a other end surface, 17 fitting portion, 18 sliding support portion, 19 connecting portion, 19a other end surface, 20 sliding member, 21 abutting portion, 22 Wedge member, 23 flange portion, 23a one end surface, 31 cone valve, 40 valve portion, 40a first rod member, 40b second rod member, 41 valve body, 41a contact surface, 42 body portion, 42a bottom surface, 42b top surface , 43 valve seat, 43a contact surface, 44 spring, 45 insertion part, 45a other end region, 45b one end region, 45c bottom opening, 45 Side opening, 46, first guide part, 47, second guide part, 47a, other end face, 100 liquid feeding device, 101 upstream slurry tank, 102 downstream slurry tank, 103 diaphragm pump, 104 first piping, 105 Second piping, 106 connection part

Claims

A cone valve used as a check valve when feeding slurry,
Comprising at least a valve body, a valve seat, and a spring incorporated so as to contact the valve body with the valve seat;
A cone valve characterized in that a total length of the spring is at least shorter than a stroke length of the valve body.
2. The cone valve according to claim 1, wherein the slurry is a slurry of nickel oxide ore.
The cone valve according to claim 1, wherein a shape of a portion where the valve body and the valve seat are in contact with each other is flat.