JP2010007842A - Double-seat valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a miniaturized double-seat valve that reduces the residual liquid quantity. <P>SOLUTION: A first valve casing 3 having a first valve chamber 3A, a second valve casing 4 having a second valve chamber 4A and a valve seat member 5 having a valve opening 6 and a drain passage 7 are integrally formed with each other to form a body 2. A first valve element 25 to be driven by a first actuator 26 to open/close the valve opening 6 is arranged in the first valve chamber 3A. A second valve element 32 to be driven by a second actuator 33 to open/close the valve opening 6 is arranged in the second valve chamber 4A. A third valve casing 10 having a third valve chamber is connected to the body 2. A third valve element to be driven by a third actuator 41 to open/close the drain passage 7 is arranged in the third valve chamber. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a double seat valve in which a valve port connecting two pipes is double sealed to prevent mixing of two kinds of fluids.

  In the food and pharmaceutical industries, cleaning and sterilization of pipes and valves are regarded as the most important issue as measures for preventing contamination by bacteria. For this reason, CIP (Cleaning in Place) that cleans and sterilizes equipment without disassembling as a cleaning and sterilization method has been proposed and implemented. In that case, in CIP, it is an important issue to prevent mixing of cleaning liquid and product liquid (hereinafter also referred to as product) and different types of products, and a double seal valve is used to solve this problem. As a double seal valve that is used, for example, those disclosed in Patent Documents 1 and 2 are known.

  In the double seal valve described in Patent Document 1, the opening and closing of the first and second openings provided in the connecting cylinder connecting the first pipe and the second pipe is controlled by the first and second valve bodies, respectively. Like to do. That is, when a fluid flows from the first pipe to the second pipe, the first and second openings are opened, and the fluid flows from the first pipe to the second pipe through the connecting cylinder, and the first and second pipes. When different liquids are allowed to flow, the first and second openings are respectively closed (double sealed) by the first and second valve bodies. Therefore, the fluid flowing through the first and second pipes does not mix. Also, even if the seal of one opening is insufficient and the fluid flowing through one pipe enters the internal space of the connecting cylinder, the other opening is sealed, so there is no risk of flowing into the other pipe, It is discharged outside through the exhaust pipe.

  The double seal valve described in Patent Document 2 is provided with first and second openings in a connecting cylinder, and these openings are controlled to be opened and closed by the first and second valve bodies, respectively. In addition, a drain pipe communicating with the outside air is connected to the third opening formed in the connecting cylinder, the third opening is controlled to open and close by the third valve body, and the first opening is further formed in the fourth opening formed in the connecting cylinder. By connecting a branch pipe branched from the pipe and controlling the opening and closing of the fourth opening by the fourth valve body, the first and second pipes, the drain pipe and the branch pipe are mutually connected via the space in the connecting cylinder. To communicate with or close.

Japanese Patent Laid-Open No. 10-103590 JP 2008-95900 A

  However, the conventional double seal valve described in the above-mentioned Patent Document 1 adopts a configuration in which the exhaust pipe that is open to the atmosphere and the space in the connecting cylinder are in communication with each other. When various germs enter the space through the exhaust pipe, there is a problem that the product flowing in the first and second pipes may be contaminated. In addition, since the first and second valve bodies are disposed through the first and second pipes, there is a problem that maintenance is troublesome and requires time.

  Since the double seal valve described in Patent Document 2 is provided with a valve in the discharge pipe so that the internal space of the connecting cylinder does not communicate with the atmosphere, there is no possibility that germs enter the connecting cylinder from outside air. There is an advantage that the above problem can be solved. However, this double seal valve has the first, second, third, and fourth valve bodies that control opening and closing of the first, second, third, and fourth openings of the connecting cylinder, respectively, outside the connecting cylinder. Therefore, there is a problem that the valve itself inevitably increases in size and the internal volume of the connecting cylinder is large, and the amount of fluid staying in the internal space increases.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a double seat valve that can be reduced in size and reduced in residual amount.

  In order to achieve the above object, the present invention provides a first valve box having a first valve chamber having a pipe connection port, a second valve box having a second valve chamber having a pipe connection port, A body main body formed integrally with a valve seat communicating with the valve box and a valve seat member having a drain passage, and a third valve chamber and drain port provided in the body main body and connected to the drain passage A third valve box having one end connected to the drain port of the third valve box, and a first valve body provided in the first valve chamber for opening and closing the valve port. A first actuator, a second actuator provided in the second valve chamber for driving a second valve body that opens and closes the valve port, and a drain actuator provided in the third valve chamber for opening and closing the drain passage. And a third actuator for driving the third valve body.

  Further, as a preferred aspect of the present invention, the body body is formed in a cylindrical body whose both ends are open, and the inner center is partitioned by a valve seat member, so that one half forms the first valve box, The other half forms a second valve box, the valve port comprises a through hole formed in the center of the valve seat member, the drain passage opens radially inside the valve seat member, and one end of the valve seat The other end communicates with the third valve chamber.

  Moreover, this invention consists of the piping connection port of a 1st, 2nd valve box consisting of two each as a preferable aspect of the said invention.

  Further, according to the present invention, as a preferable aspect of the above invention, two pipe connection ports of the first and second valve boxes are provided in one of the valve boxes and one is provided in the other valve box. It is.

  Further, according to a preferred aspect of the present invention, the pipe connection port of the first valve box and the pipe connection port of the second valve box are horizontally provided with their axes intersecting with each other and spaced apart in the height direction. It is what.

  Further, in the present invention, as a preferred aspect of the above invention, the drain passage is provided at 45 ° crossing with respect to the axis of the pipe connection port of the first valve box and the pipe connection port of the second valve box. It is.

In the double seat valve according to the present invention, the valve bodies driven by the first, second, and third actuators are respectively disposed in the valve chambers of the first, second, and third valve boxes. It can be miniaturized. Further, since the fluid in the body body only accumulates in the valve opening, the remaining amount can be reduced. Moreover, since the first and second valve boxes and the valve seat member are integrally formed to form the body body, the number of parts and assembly man-hours can be reduced, and the manufacturing cost can be reduced. The drain passage guides the fluid in the valve port to the third valve chamber. The drain pipe discharges the fluid in the third valve chamber to the outside of the valve.
Pipes for supplying products, cleaning liquid, steam, hot water and the like are connected to the pipe connection ports of the first and second valve boxes.

  Further, since the valve seat member is provided in the body main body and also serves as a partition wall for partitioning the first and second valve boxes, the body main body can be reduced in size.

When there are two pipe connection ports provided in the first and second valve boxes, one is used as an inlet pipe and the other as an outlet pipe.
When one pipe connection port is provided in one of the first and second valve boxes, it is used as an inlet pipe or an outlet pipe. When two pipe connection ports are provided in the other, one is an inlet pipe and the other is an outlet. Used as a tube.

  In the invention in which the two pipe connection ports provided in the first and second valve boxes are each composed of an inlet pipe and an outlet pipe, the axes intersect with each other and are provided horizontally in the height direction. In addition, it is easy to dispose liquid supply devices for supplying products and products so as not to interfere with each other, and the installation space can be reduced. Further, the manifold block can be easily formed.

  Furthermore, in the invention in which the drain passage is provided at 45 ° with respect to the pipe connection ports of the first and second valve boxes, the third valve box can be attached so as not to interfere with the pipe connection port. The attachment of the three valve box, the third valve body, and the third actuator is facilitated.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
FIG. 1 is an external perspective view showing an embodiment of a double seat valve according to the present invention, FIG. 2 is a front view showing a part of the double seat valve in a cutaway state, and FIG. 3 is a plan view of the double seat valve. FIG. 4, FIG. 4 is a sectional view taken along line IV-IV of FIG. 2, FIGS. 5 to 8 are diagrams for explaining the operation of the double seat valve, and FIGS. 9 to 12 are other embodiments of the present invention. It is a figure for demonstrating operation | movement of a double seat valve.

  1 to 4, the double seat valve 1 includes a body body 2. The body body 2 is formed in a cylindrical shape that is opened up and down by SUS304 or the like. A member 5 is integrally provided so as to partition the first and second valve boxes 3 and 4. That is, the body body 2 is constituted by the first and second valve boxes 3 and 4 and the valve seat member 5 which are integrally formed. The inside of the first valve box 3 forms a first valve chamber 3A, and the inside of the second valve box 4 forms a second valve chamber 4A.

  The valve seat member 5 is formed in a disc shape having an appropriate thickness, and a valve port 6 and a drain passage 7 are formed. The valve port 6 includes a through hole formed in the center of the valve seat member 5 so as to open in the upper and lower surfaces, and communicates the first and second valve chambers 3A and 4A. The drain passage 7 is formed in the valve seat member 5 so as to open in the radial direction, so that one end communicates with the valve port 6 and the other end is a third valve box 10 of a third valve box 10 described later. It communicates with the valve chamber 10A. The height m (FIG. 2) from the lower surface of the valve seat member 5 to the lower end of the drain passage 7 is set sufficiently small to reduce the amount of liquid remaining in the valve port 6 as much as possible (for example, several mm or less). ) That is, by setting the opening diameter of the drain passage 7 to a diameter slightly smaller than the thickness of the valve seat member 5, it means that the residual liquid staying in the valve opening 6 is reduced.

  As shown in FIG. 4, the third valve box 10 is formed in a cylindrical shape on the front end side and a rectangular tube shape on the rear end side as shown in FIG. It is fixed by.

  Two pipe connection ports 13A and 13B (FIG. 2) respectively communicating with the first valve chamber 3A of the first valve box 3 are separated from each other by 180 ° in the circumferential direction on the upper end side of the body body 2 so as to have an axis line. The pipe connection ports 13 </ b> A and 13 </ b> B are connected in the middle of the first pipe 14. Pipe connection port 13A, 13B consists of a pipe line part with a joint, pipe connection port 13A located in the upper stream constitutes the 1st entrance pipe, and pipe connection port 13B located in the lower stream side is the 1st exit. Make up the tube. The 1st piping 14 is connected to the liquid supply apparatus (not shown) which sends a product, a washing | cleaning liquid, a vapor | steam, or warm water. The pipe connection ports 13A and 13B are collectively referred to as the first pipe connection port 13.

  Further, on the lower end side of the body body 2, two pipe connection ports 17A and 17B (FIGS. 1 and 2) communicating with the second valve chamber 4A of the second valve box 4 are separated by 180 ° in the circumferential direction. These pipe connection ports 17 </ b> A and 17 </ b> B are connected in the middle of the second pipe 18. The pipe connection ports 17A and 17B are composed of a pipe portion with a joint, the pipe connection port 17A located on the upstream side constitutes the second inlet pipe, and the pipe connection port 17B located on the downstream side is the second outlet. Make up the tube. The second pipe 18 is connected to a liquid supply device (not shown) for sending a product, cleaning liquid, steam or hot water different from the product sent to the first pipe 14. The pipe connection ports 17A and 17B are collectively referred to as a second pipe connection port 17.

  The first piping connection port 13 and the second piping connection port 17 are provided horizontally with their axes intersecting each other at an angle of 90 ° and spaced apart in the height direction. The reason why the first and second pipe connection ports 13 and 17 are provided so as to cross each other at an angle of 90 ° is that when these pipe connection ports are provided in parallel, products and cleaning liquids are supplied to these pipe connection ports. This is to prevent the supplying devices to be supplied from being too close and interfering with each other. The first pipe connection port 13 and the second pipe connection port 17 are provided such that the axis intersects the axis of the drain passage 7 at an angle of 45 ° in the horizontal plane. In other words, the drain passage 7 is provided so as to intersect at an angle of 45 ° in the horizontal plane with respect to the axis of the pipe connection ports 13A and 13B and the pipe connection ports 17A and 17B. Further, the first pipe connection port 13 and the valve port 6 are perpendicular to each other in axis and form a T-shaped flow path. Similarly, the second pipe connection port 17 and the valve port 6 are perpendicular to each other in axis and form a T-shaped flow path. In addition, in this Embodiment, although the example which crossed the 1st piping connection port 13 and the 2nd piping connection port 17 at the angle of 90 degrees is shown, it is not restricted to this but about 60-90 degrees It may cross over an angle range. However, if the crossing angle is too small, it is not preferable because the supply devices easily interfere with each other.

  A drain hole 20 (FIG. 4) is formed on the lower surface side of the third valve box 10, and an upper end of a drain pipe 21 is connected to the drain hole 20 by welding.

  The double seat valve 1 further includes first, second, and third valves 22, 23, and 24 that are diaphragm valves that open and close the valve port 6 and the drain passage 7.

  The first valve 22 is disposed in the first valve chamber 3A of the first valve box 3 and has a first valve body 25 that opens and closes an upper end side opening 6a (FIG. 2) of the valve port 6; And a first actuator 26 attached downward to the upper end opening 29 of the valve box 3, and the first valve body 25 is attached to the lower end of the operating rod 30 of the actuator 26. The first valve body 25 is integrally formed of a fluororesin or the like, and includes a columnar head portion 25A, and a hook-shaped elastic deformation portion 25B integrally provided on the base end side of the head portion 25A. The head portion 25A is composed of a neck portion 25C provided therebetween, and the head portion 25A is seated on the upper seat portion 27a formed around the valve port 6 on the upper surface of the valve seat member 5 when the valve port 6 is closed. The upper end side opening 6a is sealed. The outer peripheral edge of the elastically deforming portion 25B is fixed to an annular protrusion 28 projecting from the inner peripheral surface of the first valve box 3, so that the upper end opening 29 of the first valve box 3 and the first valve chamber 3A Is completely shut off. Therefore, germs or the like in the outside air do not enter the first valve chamber 3A, and the liquid in the first valve chamber 3A does not leak to the outside.

  The second valve 23 is disposed in the second valve chamber 4 </ b> A of the second valve box 4 and opens and closes the lower end side opening 6 b of the valve port 6. The second valve element 32 is attached to the upper end of the operating rod 36 of the actuator 33. Similar to the first valve body 25, the second valve body 32 is integrally formed of fluororesin or the like, and is integrally formed with a columnar head portion 32A and a base end side of the head portion 32A. It comprises a collar-like elastic deformation part 32B provided and a neck part 32C provided between them, and the head 32A is located around the valve opening 6 on the lower surface of the valve seat member 5 when the valve opening 6 is closed. The lower opening 6b is sealed by being seated on the formed lower seat 27b. The outer peripheral edge of the elastically deforming portion 32B is fixed to an annular protrusion 34 projecting from the inner peripheral surface of the second valve box 4, so that the lower end opening 35 of the second valve box 4 and the second valve chamber 4A Is completely shut off. Therefore, germs in the outside air do not enter the second valve chamber 4A, and the liquid in the second valve chamber 4A does not leak to the outside.

  In FIG. 4, the third valve 24 is provided in a third valve body 40 disposed horizontally in the third valve chamber 10 </ b> A of the third valve box 10 and a rear end opening of the third valve box 10. The third valve element 40 is attached to the tip of the operating rod 46 of the third actuator 41. Similar to the first and second valve bodies 25 and 32, the third valve body 40 is made of a fluororesin or the like, and is provided integrally with the head 40A and the base end side of the head 40A. It is comprised by the deformation | transformation part 40B and the neck part 40C provided among these, and when the drain passage 7 is obstruct | occluded, it is comprised so that the head 40A may obstruct | occlude the communicating hole 42 provided in the 3rd valve box 10. FIG. . The communication hole 42 is formed in the front plate of the third valve box 10, and communicates the drain passage 7 and the third valve chamber 10 </ b> A when the third valve body 40 is fully opened. The outer peripheral edge of the elastically deforming portion 40B is fixed to an annular protrusion 44 projecting from the inner peripheral surface of the third valve box 10, so that the rear end opening 44 of the third valve box 10 and the third valve chamber 10A are fixed. And is completely shut off. Therefore, germs or the like in the outside air will not enter the third valve chamber 10A, and the liquid in the third valve chamber 10A will not leak to the outside. In addition, as such 1st, 2nd, 3rd valve body 25, 32, 40, the diaphragm valve of patent 3704657 can be used, for example.

  The first valve body 25 does not block the pipe connection ports 13A and 13B when fully opened or fully closed. Further, the second valve body 32 does not block the pipe connection ports 17A and 17B when the valve body 32 is fully opened or fully closed. Further, the third valve body 40 does not block the drain port 20 when the communication hole 42 is fully opened or fully closed. Valves not shown are provided on the upstream side and the downstream side of the double seat valve 1 of the first and second pipes 14 and 18, respectively. The valves not shown in the figure and the first, second, and third valves 22, 23, and 24 are driven and controlled by control signals from the control unit at the start of product supply, at the time of supply stop, at the time of sterilization, and washing. It is configured to be.

Next, an example of operation | movement of the double seat valve 1 which consists of the said structure is demonstrated based on FIG.1, FIG.2, FIG.5-8.
FIG. 5 is a view showing a state when the double seat valve 1 is stopped. In this stop state, the first valve body 25 closes the upper end side opening 6 a of the valve port 6, and the second valve body 32 closes the lower end side opening 6 b of the valve port 6. The double seal. Further, the third valve body 40 closes the drain passage 7. Accordingly, since the valve port 6 and the drain passage 7 are completely cut off from the atmosphere, germs and the like pass through the drain pipe 21 and the third valve chamber 10A, the drain passage 7 and the valve port 6, and further the first In addition, there is no risk of entering the second pipe connection ports 13 and 17 and the first and second pipes 14 and 18, and contamination by various germs and the propagation of germs can be reliably prevented.

  FIGS. 6A and 6B are diagrams showing a state when the double seat valve is sterilized. FIG. 6A is a diagram showing a state when the first pipe is sterilized, and FIG. 6B is a diagram showing a state when the second pipe is sterilized. At the time of sterilization of the first pipe 14 shown in FIG. 6A, the first valve body 25 is fully opened, and the second and third valve bodies 32 and 40 are held in a fully closed state. In this state, steam (or hot water) 50 is flowed from the first pipe 14 to the first pipe connection port 13, and the first pipe 14, the first pipe connection port 13, the first valve chamber 3 </ b> A, the valve The mouth 6 and the drain passage 7 are sterilized.

  When the sterilization of the first pipe 14 is completed, the state is switched to the state shown in FIG. 6B and the second pipe 18 is sterilized. At this time, the second valve body 32 is opened, and the first and third valve bodies 25 and 40 are held closed. In this state, the steam 50 is allowed to flow through the second pipe 18 to sterilize the second pipe 18, the second pipe connection port 17, the second valve chamber 4 </ b> A, the valve port 6, and the drain passage 7.

  Thus, the first and second pipes 14 and 18, the first and second pipe connection ports 13 and 17, the first and second valve chambers 3A and 4A, the valve port 6 and the drain passage 7 are completely sterilized. It will be done.

  FIG. 7 is a diagram showing a state during product feeding. At the time of product feeding, the first and second valve bodies 25 and 32 are opened, and the third valve body 40 is held in a closed state. Further, the pipe body portion downstream of the double seat valve 1 of the first pipe 14 is previously closed by a valve (not shown) so that the product 51 does not flow downstream. Further, the tube portion upstream of the double seat valve 1 of the second pipe 18 is also closed in advance by a valve (not shown) so that the product 51 does not flow backward to the upstream side of the second pipe 18. deep. In this state, a product 51 made of, for example, milk is fed to the first pipe 14 and flows to the downstream side of the second pipe 18 through the double seat valve 1. At this time,

  When the product 51 is sent from the second pipe 18 to the downstream side of the first pipe 14, the pipe portion upstream of the double seat valve 1 of the first pipe 14 is not previously disposed in reverse to the above. The product 51 is blocked by the illustrated valve so that the product 51 does not flow backward to the upstream side of the first pipe 14, and the pipe body portion downstream of the double seat valve 1 of the second pipe 18 is blocked by the unillustrated valve. It should be closed.

  FIGS. 8A and 8B are diagrams showing a state at the time of CIP. FIG. 8A is a diagram showing a state at the time of cleaning the first pipe, and FIG. At the time of cleaning the first pipe 14 shown in FIG. 8A, the first and third valve bodies 25 and 40 are repeatedly opened and closed for a predetermined time at an early cycle, and the second valve body 32 is fully closed. The acidic cleaning liquid (for example, nitric acid) 52 is intermittently fed into the valve port 6 from the first pipe 14, and the first pipe 14, the first pipe connection port 13, and the first valve The chamber 3A, the valve port 6, the drain passage 7, and the third valve chamber 10A are washed. The cleaning liquid 52 is discharged to the outside through the tube portion on the downstream side of the first pipe 14 and the drain pipe 21 and collected.

  Here, when the first and third valve bodies 25 and 40 are repeatedly opened and closed for a certain period of time at an early cycle, and the cleaning liquid 52 is intermittently blown into the valve opening 6, it remains in the valve opening 6. The product 51 is blown off by the cleaning liquid 52 and is discharged to the outside through the drain passage 7, the third valve chamber 10 </ b> A, and the drain pipe 21.

  When the acid cleaning is completed, an alkaline cleaning liquid (for example, caustic soda) is then sent to the first pipe 14, and the first pipe 14, the first pipe connection port 13, the valve port 6, the drain passage 7, The third valve chamber 10A is similarly cleaned. Thereafter, water is further fed, and the first pipe 14, the first pipe connection port 13, the valve port 6, the drain passage 7, and the first and third valve chambers 3A and 10A are similarly cleaned.

  After the first pipe 14 is washed with acid, alkali and water, the state is switched to the state shown in FIG. 8B, and the second pipe 18 is similarly washed with acid. That is, when the second pipe 18 is cleaned, the first valve body 25 is held in a fully closed state. The second and third valve bodies 32 and 40 are repeatedly opened and closed intermittently at a constant cycle, the acidic cleaning liquid 52 is sent to the second pipe 18, and the second pipe 18 and the second pipe The pipe connection port 17, the valve port 6, the drain passage 7, and the second and third valve chambers 4A and 10A are cleaned. The cleaning liquid 52 at this time is discharged to the outside through the tube portion on the downstream side of the second pipe 18 and the drain pipe 21 and collected.

  Next, an alkaline cleaning liquid is similarly sent to the second pipe 18, and the second pipe 18, the second pipe connection port 17, the second valve chamber 4 </ b> A, the valve port 6, the drain passage 7, and the third pipe 3. The valve chamber 10A is similarly cleaned. Then, further rinsing is performed with water.

  When the cleaning of the first and second pipes 14 and 18 and the double seat valve 1 is completed in this way, the first, second, and third valve bodies 25, 32, and 40 are all fully closed, and FIG. Return to the stop state shown in.

  According to such a double seat valve 1 according to the present invention, the valve port 6 is double sealed by the first and second valves 22 and 23 and the drain passage 7 is sealed by the third valve 24. It is possible to reliably prevent germs and the like from entering the body body 2 from the outside and contaminating or multiplying the product, which is suitable as a sanitary specification valve.

  Further, since the first and second valve boxes 3 and 4 and the valve seat member 5 are integrally formed to form the body body 2, the number of parts and the number of assembly steps can be reduced, and the manufacturing cost can be reduced. .

  Furthermore, in the present invention, the first, second, and third valve chambers 3A are obtained by using diaphragm valves as the valve bodies 25, 32, and 40 of the first, second, and third valves 22, 23, and 24. Since 4A and 10A are completely shut off from the outside air, it is possible to reliably prevent invasion of germs into the first, second and third valve chambers 3A, 4A and 10A. The reliability of the valve 1 can be further improved.

  9 to 12 are diagrams showing an example of the operation of the double seat valve according to another embodiment of the present invention. FIG. 9 is a diagram showing a state when the double seat valve is stopped, and FIG. ) Is a diagram showing the state of the first piping when sterilized, FIG. 10B is a diagram showing the state of the second piping when sterilizing, FIG. 11 is a diagram showing the state when the product is fed, FIG. FIG. 12A is a diagram illustrating a state of the first piping during CIP cleaning, and FIG. 12B is a diagram illustrating a state of the second piping during CIP cleaning.

  This embodiment shows an example in which one pipe connection port 13A is provided for the first valve chamber 3A and two pipe connection ports 17A and 17B are provided for the second valve chamber 4A. The pipe connection port 13A constitutes an inlet pipe by being connected to the upstream side of the first pipe 14, and the pipe connection port 13B (first outlet pipe) in the above-described embodiment is omitted. Since other configurations are completely the same, the same members and portions are denoted by the same reference numerals, and description thereof is omitted.

  9, the first, second, and third valve bodies 25, 32, and 40 are held in a fully closed state. Therefore, since the valve port 6 and the drain passage 7 are completely cut off from the atmosphere, germs and the like pass through the drain pipe 21, and the third valve chamber 10A, the drain passage 7 and the valve port 6, and further pipe connection There is no possibility of entering the port 13A, the second pipe connection port 17, and the first and second pipes 14 and 18, and contamination by bacteria and the propagation of bacteria can be reliably prevented.

  At the time of sterilization of the first pipe 14 shown in FIG. 10A, the first and second valve bodies 25 and 32 are fully opened, and the third valve body 40 is held in a fully closed state. In this state, steam (or hot water) 50 is allowed to flow from the first pipe 14 to the first pipe connection port 13A, so that the first pipe 14, the pipe connection port 13A, the first valve chamber 3A, the valve port 6, The downstream side of the drain passage 7, the second valve chamber 4A, the pipe connection port 17B, and the second pipe 18 is sterilized.

  When the second pipe 18 is sterilized, the state is switched to the state shown in FIG. At this time, the second valve body 32 is opened, and the first and third valve bodies 25 and 40 are held closed. In this state, the steam 50 (or hot water) is caused to flow through the second pipe 18, and the second pipe 18, the pipe connection port 17A, the second valve chamber 4A, the valve port 6, the drain passage 7, and the pipe connection port 17B. The downstream side of the second pipe 18 is sterilized.

  At the time of product feeding shown in FIG. 11, the first and second valve bodies 25 and 32 are opened, and the third valve body 40 is held in a closed state. In this state, the product 51 made of milk, for example, is fed to the first pipe 14 as in the above-described embodiment, and the first valve chamber 3A, the valve port 6, the second valve chamber 4A, and the pipe connection port It flows to the downstream side of the second pipe 18 through 17B.

  At the time of CIP cleaning of the first pipe 14 shown in FIG. 12 (a), the third valve body 40 is repeatedly opened and closed for a certain period of time at an early cycle, and the first and second valve bodies 25 and 32 are fully opened. The acidic cleaning liquid (for example, nitric acid) 52 is sent to the first pipe 14, and the first pipe 14, the pipe connection port 13 </ b> A, the first valve chamber 3 </ b> A, the valve port 6, the drain passage 7, The downstream side of the second and third valve chambers 4A, 10A, the pipe connection port 17B, and the second pipe 18 is washed.

  Next, an alkaline cleaning liquid (for example, caustic soda) is sent to the first pipe 14 and cleaned in the same manner as described above. And after this, it is washed in the same manner with water.

  When the second pipe 18 is washed with acid, alkali and water, the state is switched to the state shown in FIG. During the cleaning of the second pipe 18, the first valve body 25 is held in a fully closed state. Then, the second and third valve bodies 32 and 40 are repeatedly opened and closed at regular intervals, and the acidic cleaning liquid 52 is sent to the second pipe 18, and the second pipe 18 and the pipe connection port The downstream side of 17A, the second valve chamber 4A, the valve port 6, the drain passage 7, the third valve chamber 10A, the pipe connection port 17B, and the second pipe 18 is washed.

  Next, an alkaline cleaning liquid is similarly fed to the second pipe 18 and washed in the same manner as described above. Thereafter, the substrate is similarly washed with water.

  In the above embodiment, an example in which one pipe connection port 13A is provided in the first valve box 3 and two pipe connection ports 17A and 17B are provided in the second valve box 4 is shown. However, the pipe connection port 13A or 13B may be provided in the first valve box 3, and the pipe connection port 17A or 17B may be provided in the second valve box 4.

1 is an external perspective view showing an embodiment of a double seat valve according to the present invention. It is a front view which fractures | ruptures and shows a part of double seat valve. It is a top view of a double seat valve. It is the IV-IV sectional view taken on the line of FIG. It is a figure which shows the stop state of a double seat valve. (A), (b) is a figure which shows the state at the time of the disinfection of a double seat valve, respectively. It is a figure which shows the state at the time of product liquid feeding of a double seat valve. (A), (b) is a figure which shows the state at the time of the washing | cleaning of a double seat valve, respectively. It is a figure which shows the stop state of the double seat valve which shows other embodiment of this invention. (A), (b) is a figure which shows the state at the time of the disinfection of a double seat valve, respectively. It is a figure which shows the state at the time of product liquid feeding of a double seat valve. (A), (b) is a figure which shows the state at the time of the washing | cleaning of a double seat valve, respectively.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Double seat valve, 2 ... Body main body, 3 ... 1st valve box, 3A ... 1st valve chamber, 4 ... 2nd valve box, 4A ... 2nd valve chamber, 5 ... Valve seat member, 6 ... Valve port, 7 ... Drain passage, 10 ... Third valve box, 10A ... Third valve chamber, 13 ... First pipe connection port, 13A ... Pipe connection port (first inlet pipe), 13B ... Pipe connection port (First outlet pipe), 14 ... first pipe, 17 ... second pipe connection port, 17A ... pipe connection port (second inlet pipe), 17B ... pipe connection port (second outlet pipe), DESCRIPTION OF SYMBOLS 18 ... 2nd piping, 20 ... Drain port, 21 ... Drain pipe, 22 ... 1st valve, 23 ... 2nd valve, 24 ... 3rd valve, 25 ... 1st valve body, 26 ... 1st actuator, 32 ... 2nd valve body, 33 ... 2nd actuator, 40 ... 3rd valve body, 41 ... 3rd actuator, 42 ... Communication hole.

Claims (6)

A first valve box having a first valve chamber having a pipe connection port; a second valve box having a second valve chamber having a pipe connection port; and a valve port and a drain passage communicating between the two valve boxes. A body body formed integrally with a valve seat member having
A third valve box having a third valve chamber and a drain port provided in the body body and connected to the drain passage;
A drain pipe having one end connected to the drain port of the third valve box;
A first actuator that is provided in the first valve chamber and drives a first valve body that opens and closes the valve opening;
A second actuator for driving a second valve body provided in the second valve chamber for opening and closing the valve opening;
And a third actuator for driving a third valve body provided in the third valve chamber for opening and closing the drain passage. The double seat valve according to claim 1,
The body main body is formed in a cylindrical body whose both ends are open, and an inner center is partitioned by the valve seat member, so that one half forms the first valve box and the other half forms the second valve box. Forming,
The valve port comprises a through hole formed in the center of the valve seat member,
The double passage valve is characterized in that the drain passage is opened radially in the valve seat member, one end communicates with the valve port, and the other end communicates with the third valve chamber. . The double seat valve according to claim 1 or 2,
The double seat valve, wherein each of the first and second valve boxes has two pipe connection ports. The double seat valve according to claim 1 or 2,
The double seat valve according to claim 1, wherein two pipe connection ports of the first and second valve boxes are provided in one of the valve boxes and one is provided in the other valve box. The double seat valve according to claim 3 or 4,
The double-seat valve is characterized in that the pipe connection port of the first valve box and the pipe connection port of the second valve box are provided horizontally with their axes intersecting each other and spaced apart in the height direction. The double seat valve according to claim 3 or 4,
2. The double seat valve according to claim 1, wherein the drain passage is provided so as to cross 45 degrees with respect to the axis of the pipe connection port of the first valve box and the pipe connection port of the second valve box.

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