JP5303226B2 - Double seat valve - Google Patents

Description

  The present invention relates to a double seat valve for controlling a refrigerant flow rate in a freezing / refrigeration / air conditioning / hot water supply cycle.

  2. Description of the Related Art Conventionally, in a refrigeration cycle, the structure of a double seat valve is varied as a valve for controlling the flow rate of a refrigerant having a particularly high pressure and a large flow rate. In particular, when the refrigerant is carbon dioxide, it is used at a high differential pressure, so it is effective to use a double seat valve structure. The double seat valve includes a valve body having two valve ports and two valve land portions that respectively open and close these valve ports in the valve housing, and a load due to a differential pressure of refrigerant applied to the two valve land portions. By canceling each other, even if the pressure difference between the inlet and outlet is large, it can be driven by a small motor or the like.

As such a double seat valve, it is disclosed by Unexamined-Japanese-Patent No. 2004-353862 (patent document 1), Unexamined-Japanese-Patent No. 2004-19825 (patent document 2), and Unexamined-Japanese-Patent No. 2003-56723 (patent document 3), for example. There is something.
JP 2004-353862 A JP 2004-18825 A JP 2003-56723 A

  In the double seat valve, both of the two valve ports need to be in a closed state. However, in the structure of Patent Document 1, a valve body having two valve land portions is an integrally formed member. The member having the valve port is also a member formed integrally. For this reason, in order to match | combine the seating position of the two valve land parts in an axial direction, a highly accurate process is required and there exists room for improvement. In addition, since the valve land has a larger diameter than the corresponding valve port, the diameter of the valve port on the near side in the assembly direction must be larger than the diameter of the other valve port in order to assemble the valve body. The effect of canceling out the load due to the differential pressure is reduced, and there is a problem in applying it to a high-pressure refrigerant system such as carbon dioxide. Conventionally, the refrigerant pressure difference applied to the valve body has been about 3 MPa, but in the case of a high-pressure refrigerant such as carbon dioxide, when the pressure rises to about 10 MPa, there may be a problem that the valve body does not operate.

  In order to solve such a problem, for example, Patent Documents 2 and 3 require a structure in which the valve body is separated before assembly. However, in the structures as in Patent Documents 2 and 3, there is a problem that the concentricity of the two valve land portions tends to shift. In particular, as in Patent Document 3, when the valve land portion (upper valve body, lower valve body) is seated on the valve seat at the taper portion, the valve land portion and the valve seat have a slight deviation in the concentricity. The amount of leakage increases, making it difficult to use in systems that require low leakage.

  It is an object of the present invention to make it possible to eliminate the influence of a load due to differential pressure by making the diameters of two valve ports the same in a double seat valve, and to enable highly accurate assembly so as not to impair valve leakage. To do.

  The double seat valve according to claim 1 includes a main valve chamber communicating with the first inlet / outlet port in the valve housing, and a first valve formed on both sides of the main valve chamber and communicated with the second inlet / outlet port. And the second sub valve chamber, the first valve port disposed between the first sub valve chamber and the main valve chamber, and the first sub valve chamber between the second sub valve chamber and the main valve chamber. A valve body having a first valve land portion and a second valve land portion, the first sub-valve chamber, The main valve chamber and the second sub-valve chamber extend in the axial direction, and the first valve land portion opens and closes the first valve port by the axial movement of the valve body. In the double seat valve in which the portion opens and closes the second valve port, the first valve port is formed in the lower valve seat member at the bottom and the first inlet / outlet port is connected to the side portion. By fitting the cup member formed with the opening portion into the valve housing, the first sub valve chamber and the main valve chamber are partitioned, and the second valve port is formed. By fitting the valve seat member into the opening on the opposite side of the cup member from the first valve port, the main valve chamber and the second sub valve chamber are partitioned, and the valve body is A rod member extending from the first sub valve chamber to the second sub valve chamber, and a cylindrical shape forming the second valve land portion fixed to the rod member side of the rod member. A first centering portion that aligns with the first valve port, the first valve land portion, the first valve land portion, and the second land member. A second centering portion that is formed between the valve land portion and the second valve port and is aligned with the second valve port. Characterized in that it is constructed by forming integrally made is the land fixing unit for fixing the small the land member diameter than the second valve port.

  A double seat valve according to a second aspect is the double seat valve according to the first aspect, wherein the first and second valve ports have the same diameter.

  The double seat valve according to claim 3 is the double seat valve according to claim 1 or 2, wherein a male screw is formed at the land fixing portion of the rod member, and a female screw is provided inside the land member. The land member is formed and fixed to the land fixing portion by the male screw and the female screw.

  The double seat valve according to claim 4 is the double seat valve according to any one of claims 1 to 3, wherein the first auxiliary valve chamber is disposed on the second inlet / outlet port side, The first sub-valve chamber is communicated with the second inlet / outlet port by a through-hole disposed on the outer periphery of the rod member of the valve body, and an internal passage penetrating in the axial direction is formed in the rod member of the valve body. The second subvalve chamber communicates with the second inlet / outlet port through the internal passage.

  According to the double seat valve of claim 1, the cup member and the rod member are made concentric by fitting the first centering portion of the rod member of the valve body to the first valve port of the cup member, By fitting the second valve port of the upper valve seat member from the land adhering portion side to the second centering portion of the rod member, the rod member and the upper valve seat member are concentric, and the upper portion of the cup member is The valve seat member can be fitted and fixed. At this time, since the upper valve seat member is fitted from the land fixing portion side, the diameter of the second valve port can be made the same as the diameter of the first valve port. In addition, the first valve port of the cup member is closed by the first valve land portion of the rod member, and in this state, the land member is fitted to the land fixing portion of the rod member, and a second member formed by the land member is formed. The second valve port can be closed by the valve land portion. In this state, by fixing the land member to the rod member, the first valve port, the first valve land portion, the second valve port, and the second valve land portion can be made concentric with each other. It is possible to accurately adjust the axial positions of the valve land portion and the second valve land portion. Accordingly, the diameters of the two valve ports can be made the same, the influence of the load due to the differential pressure can be eliminated, the assembly can be performed with high accuracy, and low leakage can be realized.

  According to the double seat valve of the second aspect, in addition to the effect of the first aspect, since the diameters of the first and second valve ports are the same, the influence of the load due to the differential pressure can be completely eliminated.

  According to the double seat valve of Claim 3, in addition to the effect of Claim 1 or 2, the operation | work which adjusts the position of the axial direction of a 1st valve land part and a 2nd valve land part becomes easy.

According to the double seat valve of claim 4, in addition to the effect of any one of claims 1 to 3,
The first sub-valve chamber communicates with the second inlet / outlet port through a through-hole disposed on the outer periphery of the rod member, and the second sub-valve chamber is connected to the first passage by an internal passage penetrating in the axial direction of the rod member. Since the second auxiliary valve chamber is communicated with the second inlet / outlet port, there is no need for a passage communicating with the second auxiliary valve chamber to the second inlet / outlet port on the outer periphery around the axis, thereby enabling downsizing.

  Next, an embodiment of the double seat valve of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of an essential part of a double seat valve according to an embodiment. Note that the concept of “upper and lower” in the following description corresponds to the upper and lower sides in the drawing of FIG. The double seat valve of this embodiment has a valve housing 1. The valve housing 1 includes a cylindrical cylinder-shaped chamber 10 and a first inlet / outlet port (inlet port) opened on one inner peripheral surface of the chamber 10. 1a, a second inlet / outlet port (outlet port) 1b opened adjacent to one end in the axis L direction of the chamber 10, a through hole 1c communicating the second inlet / outlet port 1b and the chamber 10, A slide hole 1d is formed through which an end of a rod member 41 described later is inserted. The first inlet / outlet port 1a is formed as a horizontal hole, and a joint pipe 11 is fixed to the first inlet / outlet port 1a by brazing. The second inlet / outlet port 1b is formed as a pilot hole, and the joint pipe 12 is fixed to the second inlet / outlet port 1b by brazing.

  A cylindrical cup member 2 having a main valve chamber Rm inside is disposed in the cylindrical cylinder-shaped chamber 10. The bottom of the cup member 2 constitutes a lower valve seat member 2a, and a first valve port 21 is formed at the center of the lower valve seat member 2a. Moreover, the opening part 22 connected to the 1st entrance / exit port 1a is formed in the side part of the cup member 2. As shown in FIG. Then, by fitting the cup member 2 into the chamber 10, the space on the second inlet / outlet port 1b side of the chamber 10 becomes the first auxiliary valve chamber Rs1, and the first auxiliary valve chamber 2a causes the first auxiliary valve chamber 2a. The valve chamber Rs1 and the main valve chamber Rm are partitioned.

  An upper valve seat member 3 is disposed on the upper portion of the cup member 2. A second valve port 31 is formed at the center of the upper valve seat member 3, and a ring-shaped convex portion 3 a is formed around the cup member 2 side of the second valve port 31. . Then, as will be described later, the upper valve seat member 3 is attached to the cup member 2 by fitting the convex portion 3 a into the opening 23 of the cup member 2. A lid member 13 is disposed in the upper opening of the chamber 10, and a second subvalve chamber Rs 2 is formed between the lid member 13 and the upper valve seat member 3, and the upper valve seat member 3. Thus, the second auxiliary valve chamber Rs2 and the main valve chamber Rm are partitioned.

  Further, as will be described later, the cup member 2 and the upper valve seat member 3 are fixed to each other by welding, and the lower end portion of the cup member 2 is brought into contact with the step portion 10a of the chamber 10, The upper valve seat member 3 is press-fitted into the chamber 10. The upper valve seat member 3 and the cup member 2 are fixed by screwing the male screw 13 a of the lid member 13 into the female screw 10 b of the chamber 10.

  Further, the valve body 4 is disposed in the chamber 10 so as to penetrate the first valve port 21 of the cup member 2 and the second valve port 31 of the upper valve seat member 3. Thereby, the valve body 4 extends across the first sub valve chamber Rs1, the main valve chamber Rm, and the second sub valve chamber Rs2 in the direction of the axis L. As will be described later, the valve body 4, the cup member 2, and the upper valve seat member 3 are disposed in the chamber 10 as an assembly assembled together with a connecting rod 5 described later.

  The valve body 4 includes a rod member 41 extending from the first sub valve chamber Rs1 to the second sub valve chamber Rs2, and a cylindrical land member 42 disposed on the upper valve seat member 3 side. Has been. The rod member 41 is formed with an internal passage 41a penetrating in the direction of the axis L, and the internal passage 41a communicates with the second inlet / outlet port 1b by the slide portion 41b at the lower end passing through the slide hole 1d. . Moreover, the rod member 41 has the 1st centering part 411, the 1st valve land part 412, the 2nd centering part 413, and the land adhering part 414 from the slide part 41b side. . The land member 42 is fixed to the rod member 41 by screwing the internal female screw 42 a to the male screw 414 a of the land fixing portion 414. The land member 42 includes a step portion 421 and a second valve land portion 422, and the connecting rod 5 is fixed to the step portion 421.

  A bearing hole 131 is formed in the center of the lid member 13, and a male screw member 14 having a bearing hole 141 having the same diameter and the same diameter as the bearing hole 131 is attached to the upper end portion of the bearing hole 131. The connecting rod 5 is inserted into and supported by the bearing holes 131 and 141 so as to be slidable in the axis L direction. The bearing holes 131 and 141 need not be the same diameter as long as the connecting rod 5 can be inserted coaxially. A horizontal hole 51 penetrates the lower end portion of the connecting rod 5 in the radial direction, and the second auxiliary valve chamber Rs2 is connected to the second inlet / outlet port 1b through the internal passage 41a and the horizontal hole 51 of the rod member 41. Has been. The first sub valve chamber Rs1 is electrically connected to the second inlet / outlet port 1b through the through hole 1c.

  A cylindrical member 15 is fixed in an airtight manner on the upper portion of the valve housing 1 by brazing, and a rotor case 61 of the stepping motor 6 is fixed in an airtight manner on the upper portion of the cylindrical member 15 by welding. Inside the rotor case 61, a rotor 62 having a multi-pole magnetized outer peripheral portion is rotatably arranged. A cylindrical female screw member 63 is fixed to the center of the rotor 62. The female screw member 63 and the rotor 62 are connected to the upper end 52 of the connecting rod 5 by a connecting member 64, a fixing metal 65, springs 66, 67, and the like. It is connected with relative rotation. A female screw 63 a is formed on the inner peripheral surface of the female screw member 63, and this female screw 63 a is screwed to the male screw 14 a on the outer peripheral surface of the male screw member 14 fixed to the lid member 13. A stator unit 68 is disposed on the outer periphery of the rotor case 61, and the stepping motor 6 rotates the rotor 62 in accordance with the number of pulses when a pulse signal is given to the stator coil of the stator unit 68. Let

  A stopper holding rod 71 is suspended and fixed inside the rotor case 61. A spiral guide 72 is attached to the stopper holding rod 71, and a movable stopper 73 is engaged with the spiral guide 72. When the movable stopper 73 is kicked around by a pin 62 a attached to the rotor 62, the movable stopper 73 is guided by the spiral guide 72 along with the rotation of the rotor 62 and moves up and down. The movable stopper 73 abuts against the stopper portion 74 at the lower end of the stopper holding rod 71 or the stopper portion 75 at the upper end of the spiral guide 72 to limit the rotation of the rotor 62 in the valve closing direction or the valve opening direction. .

  With the above configuration, when the stepping motor 6 is driven, the rotor 62 rotates within a range regulated by the movable stopper 73 and the stopper portions 74 and 75. The rotation of the rotor 62 is converted into a linear motion by the screw feeding action of the male screw 14a and the female screw 63a, and the valve body 4 moves in the axis L direction via the connecting rod 5. Accordingly, the first valve land portion 412 of the valve body 4 adjusts the opening degree of the first valve port 21, and the second valve land portion 422 of the valve body 4 opens the opening degree of the second valve port 31. Thus, the same flow rate control is performed at both the first valve port 21 and the second valve port 31.

  Next, a method for assembling the cup member 2, the upper valve seat member 3, the valve body 4 and the connecting rod 5 will be described. FIG. 2 is a view showing the structure of the cup member 2, the upper valve seat member 3, and the rod member 41 of the valve body 4 and the assembling method thereof. As shown in FIG. 2 (A), in the rod member 41, the first centering portion 411 has a conical cone portion 411a centered on the axis L and an axis L continuous to the conical portion 411a. And a cylindrical column portion 411b. The diameter of the tapered surface of the conical portion 411a decreases toward the first valve land portion 412 side. The outer diameter of the cylindrical portion 411b is “d1”.

  The first valve land portion 412 has a conical first conical portion 412a centered on the axis L, a second conical portion 412b continuous with the first conical portion 412a, and a continuous portion with the second conical portion 412b. And a cylindrical cylindrical portion 412c centering on the axis L. The tapered surfaces of the first conical portion 412a and the second conical portion 412b are smaller in diameter toward the first centering portion 411, and the tapered surface of the second conical portion 412b is closer to the first conical portion 412a. The slope is larger than the taper surface. Further, the diameter of the boundary portion between the first conical portion 412 a and the second conical portion 412 b is smaller than the outer diameter “d1” of the cylindrical portion 411 b of the first centering portion 411. Further, the outer diameter of the cylindrical portion 412 c of the valve land portion 412 is “d3” which is larger than the outer diameter “d1” of the cylindrical portion 411 b of the first centering portion 411. Accordingly, the second conical portion 412b contacts the opening edge of the first valve port 21 when seated.

  The second centering part 413 has a cylindrical columnar part 413a centered on the axis L and a conical part 413b continuous with the cylindrical part 413a. The outer diameter of the cylindrical part 413a is “d2”. It has become. The land fixing portion 414 is formed with the male screw 414a.

  The inner diameter of the first valve port 21 of the cup member 2 is “D1”, and the inner diameter of the second valve port 31 of the upper valve seat member 3 is “D2”. Then, d1 = D1 except for the dimensional tolerance so that the columnar portion 411b of the first centering portion 411 of the rod member 41 is fitted into the first valve port 21 of the cup member 2. Similarly, d2 = D2 except for dimensional tolerance so that the cylindrical portion 413a of the second centering portion 413 of the rod member 41 fits into the second valve port 31 of the upper valve seat member 3. ing. In this embodiment, the first and second valve ports 21 and 31 have the same inner diameter D1 = D2.

  With the above configuration, the rod member 41 is fitted into the cup member 2, and the first centering portion 411 is fitted into the first valve port 21 of the cup member 2. The cylindrical portion 411b of the centering portion 411 has a cylindrical outer periphery, the inner peripheral surface of the first valve port 21 is a cylindrical surface, and the rod member 41 and the cup member 2 are inclined with respect to the axis L. There is no. Thereby, as shown in FIG. 2 (B), the cup member 2 and the rod member 41 can be made concentric.

  Next, in a state where the cup member 2 and the rod member 41 are concentric, the second valve port 31 is passed through the second valve port 31 of the upper valve seat member 3 from the land adhering portion 414 side as it is, and the second core port 31 is moved to the second core It fits into the protruding portion 413. Thereby, the cup member 2 (first valve port 21), the rod member 41, and the upper valve seat member 3 (second valve port 31) can be concentric. At this time, the convex portion 3a of the upper valve seat member 3 is fitted into the opening 23 of the cup member 2, but the convex portion 3a may not be provided. Here, in the rod member 41, the first centering portion 411 and the second centering portion 413 are composed of a single member by the rod member 41 itself, so that concentric processing of the respective outer diameters “d1, d2” is performed. Thus, the cup member 2, the rod member 41 and the upper valve seat member 3 can be accurately concentric. In this concentric state, the contact portion between the cup member 2 and the upper valve seat member 3 is fixed by welding. Since a bulge is generated by this welding, a step 3 b is provided in the welded portion inside the outer periphery of the upper valve seat member 3 so as not to interfere with the inner surface of the chamber 10.

  When fixed by welding in the state of FIG. 2 (B), the diameter “d3” of the cylindrical portion 412c of the first valve land portion 412 is equal to the inner diameter “D1 = D2” of the first and second valve ports 21 and 31. Since it is larger, the rod member 41 does not come off from the cup member 2 and the upper valve seat member 3, and these members become an integral part.

  FIG. 3 is a view showing the structure of the land member 42 and its assembling method. As shown in FIG. 3 (A), the second valve land portion 422 of the land member 42 includes a first conical portion 422a having a conical shape centered on the axis L, and a second contiguous to the first conical portion 422a. It has a conical portion 422b and a columnar cylindrical portion 422c centering on an axis L continuous to the second conical portion 422b. The tapered surfaces of the first conical portion 422a and the second conical portion 422b are smaller in diameter toward the opposite side to the step portion 421, and the tapered surface of the second conical portion 422b is the tapered surface of the first conical portion 422a. The slope is larger. Further, the diameter of the boundary portion between the first conical portion 422a and the second conical portion 422b is smaller than the outer diameter “d2” of the cylindrical portion 413a of the second centering portion 413 of the rod member 41, and this second The outer diameter of the cylindrical portion 422c of the valve land portion 422 is “d3” which is larger than the outer diameter “d2” of the cylindrical portion 413a of the second centering portion 413. Therefore, the second conical portion 422b contacts the opening edge of the second valve port 31 when seated. The first conical portion 422a and the second conical portion 422b of the land member 42 have the same shape as the first conical portion 412a and the second conical portion 412b of the first valve land portion 412.

  With the above configuration, first, the rod member 41 is pushed in from the state shown in FIG. 2B, and the first centering portion 411 is removed from the first valve port 21 as shown in FIG. One valve land portion 412 is seated on the lower valve seat member 2 a of the cup member 2. At this time, the first conical portion 412 a of the first valve land portion 412 is fitted in the first valve port 21, and the second conical portion 412 b is in contact with the opening edge of the first valve port 21. In this state, the land member 42 is fitted into the land fixing portion 414 of the rod member 41, and the female screw 42a is screwed into the male screw 414a. Then, the land member 42 (second valve land portion 422) is seated on the upper valve seat member 3 as shown in FIG. At this time, the first conical portion 422 a of the land member 42 is fitted into the second valve port 31, and the second conical portion 422 b abuts against the opening edge of the second valve port 31. And the edge part of the rod member 41 and the land member 42 is fixed by welding. This welding also serves to prevent refrigerant leakage due to the gap between the male screw 414a and the female screw 42a. Next, the lower end portion of the connecting rod 5 is fitted into the step portion 421 of the land member 42, and the land member 42 and the connecting rod 5 are fixed by welding as shown in FIG. At this time, the connecting rod 5 is welded vertically to the rod member 41 so that the axis is a straight line.

  As described above, the assembly in which the cup member 2, the rod member 41, the land member 42, the upper valve seat member 3 and the connecting rod 5 are assembled is disposed in the chamber 10. At this time, the lid member 13 is inserted into the chamber 10 such that the slide portion 41b of the rod member 41 is passed through the slide hole 1d and the connecting rod 5 is passed through the bearing hole 131 of the lid member 13 and the bearing hole 141 of the male screw member 14. Screw in. Note that the slide hole 1d and the bearing holes 131 and 141 have a backlash, and the slide hole 1d and the bearing holes 131 and 141 are restrained to impair the fully closed state as shown in FIG. It is supposed not to.

  As described above, by fitting the first centering portion 411 of the rod member 41 of the valve body 4 to the first valve port 21 of the cup member 2, the cup member 2 and the rod member 41 are concentric, and the rod By fitting the second valve port 31 of the upper valve seat member 3 into the second centering portion 413 of the member 41, the rod member 41 and the upper valve seat member 3 are concentric, and the opening 23 of the cup member 2. The upper valve seat member 3 can be fitted and fixed to the upper part. At this time, since the upper valve seat member 3 is fitted from the land fixing portion 414 side, the diameter of the second valve port 31 can be made the same as the diameter of the first valve port 21. Therefore, the influence of the load due to the differential pressure can be eliminated.

  The first conical portion 412a and the second conical portion 412b of the first valve land portion 412 and the first conical portion 422a and the second conical portion 422b of the land member 42 have the same shape. Even in the state of the intermediate opening between the closed state and the fully opened state, the first valve port 21 and the second valve port 31 have the same opening degree, and there is no influence of the load due to the differential pressure constantly. Note that the inclination angles of the tapered surfaces of the first conical portions 412a and 422a and the tapered surfaces of the second conical portions 412b and 422b are different depending on the relationship between the position of the valve body 4 in the sliding direction and the opening degree. However, the first valve land portion and the land member may have a single cone shape with a single tapered surface.

  Further, the first valve port 21 of the cup member 2 is closed by the first valve land portion 412 of the rod member 41, and in this state, the land member 42 is fitted to the land fixing portion 414 of the rod member 41. The second valve port 31 can be closed by the valve land portion 422 of the land member 42. Then, by fixing the land member 42 to the rod member 41 in this state, the first valve port 21, the first valve land portion 412, the second valve port 31, and the second valve land portion 422 are concentric. In addition, the positions of the first valve land portion 412 and the second valve land portion 422 in the axis L direction can be accurately adjusted. Therefore, it can be assembled with high accuracy and low leakage can be realized.

  As shown in FIG. 5, when the valve is opened, the refrigerant flows as indicated by an arrow, but even in the fully opened state, the first centering portion 411 does not block the first valve port 21 and the second centering is performed. The lengths of the first centering part 411 and the second centering part 413 are set so that the part 413 does not block the second valve port 31. Further, the conical part 411a of the first centering part 411 and the conical part 413b of the second centering part 413 make the flow of the refrigerant smooth.

  In the embodiment, since the land member 42 is fixed to the rod member 41 by turning the female screw 42a of the land member 42 into the male screw 414a of the land fixing portion 414, the first valve land portion 412 and The operation | work which adjusts the position of the axis L direction of the 2nd valve land part 422 becomes easy. The land member and the rod member may be fixed by other methods.

  In order to make the second subvalve chamber Rs2 have the same pressure as the first subvalve chamber Rs1, a passage is provided in or around the valve housing 1, and the second subvalve chamber Rs2 is connected to the second inlet / outlet. The port 1b (or the first auxiliary valve chamber Rs1) may be communicated with. In contrast, in this embodiment, the second sub valve chamber Rs2 communicates with the second inlet / outlet port by the internal passage 41a penetrating in the axis L direction of the rod member 41. Therefore, the valve housing 1 Therefore, it is possible to reduce the size without requiring a passage on the outer periphery around the axis.

It is a principal part longitudinal cross-sectional view of the double seat valve of embodiment of this invention. It is a figure which shows the structure of the cup member in embodiment, the upper valve seat member, and the rod member of a valve body, and its assembly method. It is a figure which shows the structure of the land member in the embodiment, and its assembly method. It is a figure which shows the adhering state of the connecting rod in embodiment. It is a figure explaining the flow of the refrigerant | coolant at the time of valve opening in embodiment, and the length of the 1st centering part and the 2nd centering part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve housing 1a 1st inlet / outlet port 1b 2nd inlet / outlet port 2 Cup member 2a Lower valve seat member 21 1st valve port 22 Opening part 23 Opening part 3 Upper valve seat member 31 2nd valve port L axis | shaft Rm Main valve chamber Rs1 First subvalve chamber Rs2 Second subvalve chamber 4 Valve body 41 Rod member 41a Internal passage 411 First centering portion 412 First valve land portion 413 Second centering portion 414 Land Adhering portion 414a Male screw 42 Land member 42a Female screw 422 Second valve land portion

Claims (4)

A main valve chamber communicating with the first inlet / outlet port in the valve housing, first and second sub-valve chambers formed on both sides of the main valve chamber and communicated with the second inlet / outlet port, respectively; The first valve port disposed between the first sub valve chamber and the main valve chamber, and the first valve port disposed on the same axis between the second sub valve chamber and the main valve chamber. A second valve port configured to
A valve body having a first valve land portion and a second valve land portion, extending across the first sub valve chamber, the main valve chamber and the second sub valve chamber in the axial direction; In the double seat valve in which the first valve land portion opens and closes the first valve port and the second valve land portion opens and closes the second valve port by the axial movement of the valve body,
By fitting in the valve housing a cup member in which the first valve port is formed in the lower valve seat member at the bottom and an open portion communicating with the first inlet / outlet port is formed in the side portion , The first auxiliary valve chamber and the main valve chamber are partitioned,
By fitting the upper valve seat member formed with the second valve port into the opening of the cup member opposite to the first valve port, the main valve chamber and the second sub valve The room is partitioned,
A rod member extending from the first sub valve chamber to the second sub valve chamber; and the second valve land fixed to the second sub valve chamber side of the rod member. It is composed of a cylindrical land member that forms a part,
The rod member is aligned with the first valve port, the first centering part, the first valve land part, and between the first valve land part and the second valve land part. A second centering portion formed and aligned with the second valve port; and a land fixing portion formed on the second sub-valve chamber side and fixing the land member having a smaller diameter than the second valve port; A double seat valve characterized by being formed integrally.   The double seat valve according to claim 1, wherein the first and second valve ports have the same diameter.   A male screw is formed at the land fixing portion of the rod member, a female screw is formed inside the land member, and the land member is fitted and fixed to the land fixing portion by the male screw and the female screw. The double seat valve according to claim 1, wherein the double seat valve is provided.   The first auxiliary valve chamber is arranged on the second inlet / outlet port side, and the first auxiliary valve chamber is formed by a through hole arranged on the outer periphery of the rod member of the valve body. An internal passage penetrating in the axial direction is formed in the rod member of the valve body, and the second auxiliary valve chamber is communicated with the second inlet / outlet port by the internal passage. The double seat valve according to any one of claims 1 to 3.

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