JPS5919789A - Three-way valve controlling apparatus - Google Patents

Abstract

PURPOSE:To enable to establish ''normally open condition'' and ''normally closed condition'' with ease, by disposing a resilient member for pressing a piston connected to valve bodies in either of a first pressure chamber or a second pressure chamber of a cylinder selectively. CONSTITUTION:A resilient member 12 is disposed selectively in either of a first pressure chamber 11a or a second pressure chamber 11b. In case that the member 12 is disposed in the second pressure chamber 11b, a piston 6 and valve bodies 4a, 5a are always urged in the forward direction, so that an upper valve mechanism 4 is closed and a lower valve mechanism 5 is opened. Therefore, a first fluid passage 3a and a third fluid passage 3c are communicated with each other, so that ''normally open condition'' is established. On the other hand, in case that the resilient member 12 is disposed in the first pressure chamber 11a, a second fluid passage 3b and the third fluid passage 3c are communicated with each other by the pressing force of the member 12, so that ''normally closed condition'' is established. In setting the resilient member 12, recesses 9a, 9b of the piston 6 perform the positioning of the end part of the coil spring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling the valve position of a normal position switching valve for fluid control in food and other piping systems.

Generally, the normal position switching valve d is mutually connected iff! A second flow path and a third flow path communicate with the first flow path in an F-shaped branch shape, and the first flow path and the second flow path as well as the first flow path An opening/closing valve mechanism is provided between each phase 17 between the phase 17 and the channel 1, and only one of these opening/closing valves is opened and the other is closed. Or, by opening both on-off valves tl' + t and I'E of d1 and setting their opening degrees to desired values, the above three flow paths become in three different communication states. It consists of (.

Such normal position switching valves are used in crowded areas in fields where flow path switching efficiency affects work efficiency, such as in piping systems for filling foods such as beer and juice. For switching the position of the valve body in the mechanism, a coaxial control device is attached to the normal position switching valve.

For conventional control devices, for example,
As seen in Publication No. 327, a piston integrally connected to the valve body is always elastically biased in a certain direction, and the valve position when control pressure is supplied is set at its upper limit and one lower limit. In addition, the control pressure chamber of the cylinder containing the piston is divided into two parts, and a stopper member is provided on one side to set the intermediate level of the valve body, thereby reducing the internal pressure of the control pressure chamber. With the "Piston Toy" force)・
A lance-slung format was adopted.

However, in such a control device, the biasing direction of the piston connected to the valve body is fixed (C) and cannot be changed, so safety when control pressure is not supplied is limited. In other words, if the safe side of the valve body is set to the normal oven that opens the first flow path during manufacturing, it cannot be changed to the normal oven position after it is assembled into the piping. It is impossible to change the state to closed (the state in which the first flow path is blocked), and in this case, it is necessary to replace the control device with a control device that is previously set to normally closed.Therefore, the conventional control device It was not possible to quickly change the control system according to the requirements, and large-scale rework of the piping system was required, and an improvement was desired.In order to improve this, the conventional method was If an attempt is made to improve and satisfy the above requirements, the height of the control device will increase, which will significantly reduce its operability when attached to a collective pipe and increase the installation space. ,Actually, there was a "second hand nJa" effect. 8:IQ,, I put a lot of effort into changing the level of the book that gives you +H while turning (changed the position, Yo-bui, Straight); He, lHlz. jJ '7 He also had the disadvantage of having a high IQ.

This invention improves the drawbacks of conventional control devices and
11> The position of the valve on the safe side (1 m) can be easily set to the desired position by simply changing the insertion point of the swab (1 m) that connects with this valve body (tt) and energizes the piston. The purpose of this invention is to provide a complete control device that does not require any effort to operate due to the control/grid.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a control device 1 is installed coaxially above a normal position switching valve 2. The normal position switching valve 2 has three flow paths 3a, 3b, 3c configured in a substantially F shape and two pmIWs.
4 + 5 (flit), and select between a normal state in which one of the valve mechanisms 4 and 5 A is closed and the other is open, and a state in which both are opened at a certain degree. Uniformly set. In addition, 4a and 5a are valve bodies, and 4b.

5b indicates a valve seat.

Next, the control device 1 has a piston 6 connected to the upper part of the normal position switching valve 2 and a built-in cylinder 7VC, and has a control section 8 at the end of the cylinder 7.

In No. 21i1C, the piston 6 has recesses 9a and 9bk on its upper and lower surfaces, respectively, and a connecting rod 10 that connects the piston 6 and the valve bodies 4a and 5a at its center. Fixed. In addition, supply and exhaust pressure bows A and B are provided on the outer walls of the first pressure chamber 11a and the second pressure chamber 111 in the cylinder 7 defined by the piston 6, respectively (see FIG. 1). The elastic member 12, such as a spring, which urges the piston 6 in the forward direction (upward) or backward direction (downward) is the seventh member.
It is alternatively installed in the pressure chamber 11a and the second pressure chamber 11b, but in that case, as in the illustrated example, a compression coil spring is used as the elastic member 12, and this is inserted into the second pressure chamber 11.
When installed in b, the piston 6 or valve body 4a, 5
Since a is always urged in the forward direction, the two-part valve mechanism 4 is closed, and the lower valve mechanism 5-
1. When opened, the first flow path 3a and the first flow path 3a are in communication 11. A so-called normal oven state is established. This (the lower valve mechanism 5 is closed, the upper valve mechanism 4 is opened, and the second flow path 31) and the third flow path 3C are communicated with each other.
'l, the state becomes a so-called normally closed state. Which of the above two states to set is determined by which state the safety point is in.

In addition, when installing the elastic part fA12, the protrusion parts 9a and 9b of the piston 6 are useful for positioning the end 741 of the coil spring.

Next, the control section 8 includes a predetermined mechanism built inside the control valve box 13. That is, the valve box 13 has a cylindrical wall 13a.
A partition wall 14 is provided at an intermediate portion of the chamber, and a first chamber 5 and a second chamber 16 are defined by this partition wall 14VC. A threaded portion 17 is provided on a part of the inner wall surface of the first chamber 15,
A valve seat 19 is formed at the center of the lower end of the cylindrical positioning part + 1B which is screwed into and out of this eagle part 17 . Further, a rotary member 20 is rotatably provided at the upper end of the cylindrical wall +3a and also serves as a lid, and a plurality of bottles 21 are provided to protrude downward from the inner surface of the rotary member 20. The positioning member 18 is slidably fitted into the vertical holes 22 formed at the plurality of cylindrical positions. By holding the handle 23 (provided on the outer periphery of the rotating member 20) in your hand and rotating the rotating member 20 by a predetermined angle in the forward or reverse direction, the positioning member 1B can be moved in the forward or reverse direction. While being rotated in the direction,
Displaced into two parts. A bracket 24 is provided protruding from the cylindrical wall 13a near the rotating member 20, and a stopper screw 25 is provided on the bracket 24.

Further, the control rod 26 inserted through the first chamber 15 and the second chamber 16 controls a lower rod 26a connected to the piston 6 and a base rod 26b passing through the rotation member 20. A through hole 27 is formed at this connecting portion inside the box so that the first chamber 15 and the second chamber 16 of the valve box 13 communicate with each other.

2. In the first chamber 15, the upper rod 26
A cylindrical movable valve member 2B is hermetically and slidably fitted to the outside of the O' valve member 28.
a first valve portion 28a for opening and closing the indoor boat 27a;
A second valve portion 28b corresponding to the valve seat 191C of the positioning member 18 is provided, while a stepped portion 29a is provided immediately below the first chamber side bow 27a in the upper Rond 26b.
is formed, and a spring 29b that constantly presses the movable valve member 28 against the step 11 portion 29a is interposed between the movable valve member 2 and the L-positioned rotary valve member 20. The stepped portion 29a and the spring 291) constitute the positioning mechanism 29 of the movable valve member 2B, and the second valve portion 281) of the movable valve portion 4'A28 is the positioning portion +;t +
8 (when the valve seat 19 is not in contact with the valve seat 19, the positioning mechanism 290 acts to prevent the valve seat 19 from being in contact with the first chamber side hole) 2
7a is set to be closed by the seventh valve portion 28aVc of the movable valve member 28.

Here, the first chamber 15 is divided into a t section compartment 15a and a lower compartment 15b by the valve seat 19VC of the positioning member 18.
The supply and exhaust pressure ports are connected to predetermined portions of the cylindrical wall 13a corresponding to the respective compartments 15a and 15b (Vc). D
is provided, and a cylindrical wall 1 corresponding to the second chamber 16 is provided.
A supply/exhaust pressure bow) E is also provided at a predetermined portion of 3a.

According to the control device 1 described above, the positions of the valve bodies 4a and 4b of the three-way switching valve 2 can be adjusted to the upper limit (the upper valve mechanism 4 is closed), the lower limit (the lower valve mechanism 5 is closed), and the lower limit (the lower valve mechanism 5 is closed). It can be easily set at an intermediate position, and the above-mentioned normally open and normally closed positions BVc can be easily set.

That is, the normal oven state is set by interposing the elastic member 12 made of a compression coil spring in the second pressure chamber 11bVC of the cylinder 7, while the elastic member 12 is interposed in the seventh pressure chamber 11aVC of the cylinder 7. This sets the normally closed state. Therefore, with this control device, when changing between the two states, there is no need to use separate control devices that are previously set to normally open or normally closed, as is the case with conventional methods. , there is no need for major rework of the piping system.

In addition, when setting the valve bodies 4a, 4b to intermediate positions and making the three flow paths 3a, 3b, 3c communicate with each other, the following method 1 is used.
1 (llJ Yobi).

As shown in Figure 7, set to normal open 3Σ
Pipe d1 supply and exhaust pressure boat 1) and 8 to the culm with 71
In this state, the positions of the valve bodies 4a, 4b,
In other words, in order to obtain the desired valve openings of the upper bullet [4 and the upper valve mechanism 5], the handle 23 is operated to rotate the rotating part 20 by a certain angle in the forward or reverse direction. As a result, the positioning member 18 is displaced to a position corresponding to the opening degree, for example, as shown by arrow J in FIG. As a result, the second valve portion 2 of the 1if valve operating member 28
81] and the valve seat 19 of the positioning portion 4'A1B.

When the supply pressure boat CVc is pressurized from this state, the fluid pressure is
, the supply/discharge pressure boat D1 pipe 31 and the supply/discharge pressure boat Δ enter the first pressure chamber 11a in this order, so the piston 6
Then, the valve bodies 4a and 5a are pushed down against the downward force of the elastic member 12, thereby opening the upper valve mechanism 4. As the piston 6 and the valve bodies 4a and 53 descend, the control rod 26 descends, and the movable valve member 28 follows this and descends as indicated by the arrow Q in FIG. When the second valve part 281 of the member 28 comes into contact with the valve seat 19 of the positioning member 18, the upper compartment 15a and the lower compartment +5b are shut off, and the first
Supply pressure to the pressure chamber 11a is stopped. Therefore, the lowering of the piston 6 and the valve bodies 4a, 5a is stopped, and these are held at their intermediate positions, and the three flow paths 3a, 3b, 3
c can communicate with each other. Note that if excessive pressure acts on the first pressure chamber 11a at the time when the second valve portion 28b and the valve seat 19 come into contact, the control iron 26 becomes elastic as shown by the arrow in FIG. It descends against the bias of the member 12, but at this time, since the movable valve member 28 is positioned by the positioning member 1B, the first chamber side boat 27a of the through hole 27 is opened to the lower compartment +5b, As a result, the surplus pressure in the first pressure chamber 11a flows backward through the supply/discharge pressure boat A, the piping 31, the supply/discharge pressure boat D, and the lower compartment chamber 15b, and furthermore, the first chamber side bow) 27a, the through hole 27, No. 1,
It passes through the second chamber side hoe 27b, the second chamber 16, and the supply/discharge boat E in this order and is released into the atmosphere. In this way, when the lid is completely removed, the elastic part (A12
The valve bodies 4a, 5a are set to proper positions by the force of the arrow A (see FIG. 5, 1j; j).

On the other hand, as shown in FIG. 8V, when it is set to normally closed, the supply/discharge pressure boat D and the supply/discharge pressure boat B are connected through the pipe 32Vc, and pressure is supplied to the supply/discharge pressure boat E. . In this case, initially, the first chamber side bow 27a of the through hole 27 is, for example, as shown in FIG.
Since it is open to the lower compartment +5b, pressure is sent from the seventh chamber 15 to the second pressure chamber 11b of the cylinder 7 through the piping 32, and this pressure causes the piston 6 and the valve body 4a to
, 5a is raised, the first chamber side boat 27a of the through hole 27 is closed by the first valve portion 28a of the movable valve member 28, as shown in FIG. The pressure feeding is stopped, the valve bodies 4a and 5a are set at predetermined positions, and the flow paths 3a and 3J3c are communicated with each other. Furthermore, when excess pressure is supplied to the second pressure chamber HbVc, the control rod 26 is pushed an extra amount commensurate with the excess pressure. A passage (a) is formed such that the excess pressure is released from the supply/discharge pressure boat C to the atmosphere through this passage (a). Therefore, the valve bodies 4a, 5a are set at an appropriate position M.

When the control method as explained above is adopted, the valve body 4a
, 5a can only assume the L lower limit and intermediate positions, and the valve bodies 4a, 5a cannot be set from the intermediate position to the upper or lower limit except when operating the handle 23. That is, each channel 3a, 3b, 3.
from the state where c is in communication with each other, the second flow path 3b is instantly opened.
It is also impossible to switch to a state in which only the third channels 3C communicate with each other, or to switch to a state in which only the first channel 3a and the third channel 3c communicate with each other.

Therefore, in order to meet the first requirement, the control valve 40 shown in FIGS. 2 to 4 is used for several purposes.

In FIG. 2, the inside of the control valve 40 is divided into a seventh chamber 43 and a second chamber 44 by a partition plate 42, and the first chamber 43 and the second chamber 44 are connected to each other. The first piston 45 and the second piston 46 are each housed in a separate interior (11).
45a, 46a Outer wall parts of the valve box 41 facing each other L and C (one pair each for supply and exhaust pressure bows) F, U, II, and J are set up. .Still, the second
The piston 46;;j has a penetrating valve hole 49 located at its axis.
is formed, and a first valve seat portion 5 is formed at an opening on the back side of the valve hole 49 and an opening on the L pressure receiving surface 46a side, respectively.
0a and a second valve seat portion 50b, while a shaft portion 45b integrally formed with the first piston 45 is connected to the second chamber 4.
The first valve seat portion 5 is protruded from the inner portion 1 of the valve seat portion 5 at the tip thereof.
A first valve body 51a corresponding to the second valve seat 50b is provided in the valve hole 49, and a second valve body 51b corresponding to the second valve seat 50b is provided in the valve hole 49.

Here, the first piston 45 and the second piston 4
Spring 52, 53 is interposed between each of the pistons 6 and the partition plate 42, and both pistons 45, 46 are biased in the direction of Japanese tile. The first valve body 51a is open. Also, a spring 54 is connected between the second piston 46 and the second valve body 51b.
is inserted, and this second valve body 51b is biased in the closing direction. In that case, in the natural state, the tip end surface of the second valve body 51b hits the outer wall of the valve box 41, and the space between the second valve seat 50b and the second valve body 51b is opened despite the above-mentioned bias. has been done. Furthermore, the shaft portion 45b of the first piston 45
VC, the communication hole 55 that communicates the pressure receiving surface 45a of the first piston 45 with the second chamber 44 is shaped like
The piston 46 has an outer peripheral surface portion and a first valve seat portion 50a.
(!) A communication hole 56 extending between
The valve body 51b also has a communication hole 57 that communicates the two compartments in the valve hole 49 divided by the second valve body 51b.
is formed. A supply/discharge pressure boat J corresponding to the communication hole 56 is provided on the outer wall of the valve box 41.

In addition, in FIG. 2, 58 shows a switching valve, 59 shows a pressure sending compressor, and 60id blind cover.

In the above, in order to cause the control valve 40 to perform the above-mentioned action, as shown in FIG. 1! :G, D2J, Δ and ■ are connected respectively, while the supply pressure boats F and 11 are connected to the switching valve 5BVC by piping 64.65.

In this state, when the switching valve 58 is set to the neutral position @, as is clear from FIG.
F and 1 are communication hole 55, valve hole 4
9. Due to the communication through the communication hole 57Vc, the first pressure chamber 11a of the cylinder 7 is open to the atmosphere, and the valve body 4a,
5a is set to its upper limit by the bias of the elastic member 12, and the upper valve mechanism 4 is closed. Therefore, only the first flow path 3a and the third flow path 3c are communicated with each other.

Next, when setting the valve bodies 4a, 5a to desired intermediate positions, after displacing the positioning member 18 to a predetermined level as described above, the switching valves 58 are all set to the first position 4'PL. As a result, the fluid pressure sent from the supply and exhaust pressure port F acts on the pressure receiving surface 45a of the first piston 45, causing the seventh piston 45 to move downward as indicated by arrow S in FIG. Therefore, the seventh valve element 51a closes the first valve seat portion 50a, and the fluid pressure is transferred to the supply/discharge pressure boat C through the supply/discharge pressure boat (G) and the piping 61. On the other hand, supply and exhaust pressure boat J and ■
are communicated through the communication hole 56, the valve hole 49, and the communication hole 57, so the supply and exhaust pressures D and H are communicated. Therefore, in the same manner as described above, the valve body 4a
, 5a or a predetermined intermediate position, each flow path 3a,
3b and 3c are communicated with each other.

If it becomes necessary to close the lower valve mechanism 5 from this state, the switching valve 58 is set to the second position P2 and the supply/discharge pressure boat HK is sent. As a result, as shown in FIG. 4, the fluid pressure sent from the supply/discharge pressure bow 1-F acts on the pressure receiving surface 46aK of the second piston 46, causing the second piston 46 to move as indicated by the arrow T in FIG. Move it up like this.

Therefore, the second valve seat portion 50b and the second valve body 51b are pressed together to close them, and the first pressure chamber 1 of the cylinder 7 is closed.
Fluid pressure is directly supplied to 1a through the supply/discharge pressure bow) I and the pipe 63, and the valve bodies 4a and 5a are moved to their lower limit against the bias of the elastic part 1fA12, and the lower valve Mechanism 5 is closed.

On the other hand, when the control device 1 is set to normally closed, the piping 66°67.68
According to tζ, the supply and exhaust pressure boat ■rito (U, 'D and J, B
and 11 evenings each. The effect in this case is as described above.
．． Since it is clear from his early life, the details will be omitted.

As is clear from the explanation below, according to the present invention, the piston connected to the valve body can be moved in the forward or backward direction (
By simply changing the installation location of the elastic part +4 that exerts the force between the first and second pressure chambers of the cylinder, the normally open and normally closed states can be easily set. In order to meet this demand, not only is there no need for separate control devices and extensive piping work as in the past, but the entire device is made more compact and the cost is reduced.

[Brief explanation of drawings]

Fig. 1 Qj Embodiment of this invention
Partially cutaway side view of JU Ranorada three-position exchange valve, Figure 2v
Figures 3 and 4 are partially cut-away side views of the control device with the control valves removed, and Figures 5 and 6 are longitudinal sectional side views for explaining the operation of the control valves. FIG. 7 is a diagram of a piping system in a normal oven, and FIGS. 8 and 9 are diagrams of a piping system in a normally closed state. 1... Control device, 2... Three-position exchange valve, 3a, 3b
, 3c...Flow path, 4, 5...Valve mechanism, 4a, 5a.
... Valve body, 6... Piston, 7 TTT cylinder, 10
・Connecting rod, 11a-Q・1st pressure chamber, llb・
...Second pressure chamber, 12...Elastic member, 13...Control valve box, +3a...Cylindrical wall, 15...First chamber, 16
... No. 2 cloudy i-chamber, 18... Positioning member, 20.
...Rotating member, 23...Handle, 26...Control a
rod, 27...1ml hole, 27a...first chamber side boat, 27b...second chamber side boat, 28...movable valve member, 28a...7th valve part, 28b...・Second valve part, 29...positioning mechanism, A, B, C, D, E...
Air pressure boat. Figure 3 6194 Figure 4 5a Figure 5 Figure 6 9b

Claims (1)

[Claims] By switching the valve body between the upper and lower limits and the three intermediate positions, the three flow paths are in three different communication states (in a normal position switching valve configured to be set, the valve body is A single pressure boat is provided outside each of the first pressure chamber and the second pressure chamber defined by the piston of the cylinder containing the piston connected to the piston, and the piston is moved in the forward or backward direction. The elastic part 41 which is biased can be selectively inserted into the seventh pressure chamber and the second pressure chamber, while the elastic part 41 of the control valve box in which different first and second chambers are partitioned can be installed in the seventh pressure chamber and the second pressure chamber. In one chamber, a positioning member for setting the intermediate position of the valve body is displaceable. and to this control rod,
A through hole is formed to communicate the first chamber and the third base of the valve box, and the movable valve member is slidably moved in the axial direction in the first chamber. Z) A seventh valve part for opening and closing the first chamber side boat and a second valve part corresponding to the valve seat formed on the positioning member are provided, and the second valve part corresponds to the valve seat. A positioning mechanism is provided inside the valve box for positioning the movable valve member relative to the control rod so that the first chamber side exhaust boat is closed by the first valve portion of the movable valve portion 4n only when the movable valve member 4n is not in contact with the first chamber side exhaust boat. , the first
A control device for a normal position switching valve, characterized in that a supply/exhaust boat is provided on each of the outer walls of the two compartments partitioned by the L valve seat in the chamber, and on the outer wall of the second chamber.