JPH08135815A - Check valve - Google Patents

Abstract

PURPOSE: To surely maintain sealing performance with a structure having a less fluid resistance and with a small open/close stroke of a valve, in such a way that the principal part thereof is not damaged by a fluid. CONSTITUTION: A valve body 1 is made up by integrally connecting a spherical body part 11 in which a fluid inlet port B is provided in its lower part and also a conical and an inverse-conical valve seats 14, 15 are connected in the inside thereof, and a tubular cylinder part 12 having a fluid outlet port C turned upwards. A cylindrical valve element 21 is slidably housed inside thereof in such a way that when it is lowered the lower end thereof is abutted on the valve seat 14, and the outer circumferential part of the cylindrical valve element 21 and the inner surface of the valve body are connected through a diaphragm 25, and the undersurface of the diaphragm 25 is communicated with a primary flow passage D, and also the cylindrical valve element 21 is energized by the elasticity of a coil spring 23 that has been provided to the upper surface of the diaphragm 25 so that it can be abutted on the valve seat 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve that can be used regardless of vertical or horizontal piping.

[0002]

2. Description of the Related Art In general, a check valve is a valve that operates so as to prevent a backflow mainly due to the back pressure of a pipeline through which liquids, gases, etc. flow, that is, a one-way valve, and the fluid is always constant. Keeping directional flow is an important condition in pipelines. However, backflow for any reason is a phenomenon that should not occur because it may cause damage to the equipment, damage to the entire equipment, or cause a disaster.Therefore, in order to prevent backflow automatically and promptly. The valve structure of is important.

As a conventionally used check valve, a cast iron 10k swing check valve for ships (JIS-F7373)
Is mainly for vertical piping, and when backflowing, it may adversely affect the pipeline due to chattering and slamming (state in which the valve element closes rapidly). Also, bronze for ships 1
6k Union bonnet type lift non-return valve (JIS
-F7417) is used only for horizontal piping, but it is similar to a sphere valve and has a large fluid resistance. Both of these check valves are made of metal for the valve element and valve seat material. Yes,
The drawbacks were the noise due to the metallic noise accompanying the opening and closing of the valve, and the wear of the main parts such as the valve body and valve seat due to the fluid.

Further, as one of the structures that have been spotlighted in recent years, two semi-circular valve plates that are openably and closably supported by a pin that penetrates the center of the valve body are used as springs supported by the pins. There is a check valve that is biased to close the valve opening by reaction force. (Refer to Japanese Utility Model Laid-Open No. 60-184467) This one opens the valve opening by stacking two semi-circular valve plates back to back during normal flow, and when backflowing,
The force of the spring quickly spreads the two semi-circular valve plates to close the valve port and prevent backflow.

Further, a ball-shaped valve seat chamber having a fluid outlet provided below and a valve seat connected to the inside thereof is integrally connected with a main body having a fluid inlet provided above, and an inner peripheral surface of an intermediate portion is provided inside. A cylindrical valve body having an annular piston is slidably accommodated so that the lower end thereof abuts the annular valve seat packing portion on the upper surface of the valve seat when descending, and the upper surface of the piston of the cylindrical valve body and Conventionally known is an on-off valve (ON-OFF valve) configured to raise or lower the tubular valve body by opening or closing the valve port by introducing pressure fluid into any of the working chambers formed on the lower surface. It is known. (See Japanese Utility Model Laid-Open No. 54-91730).

[0006]

The check valve having the two semi-circular valve plates described above has a degree of freedom in the mounting posture of the pipe, but the valve plate occupies a large proportion in the flow path, and the fluid resistance is high. And the valve plate protrudes from the end surface of the valve body when the valve is opened.

Further, in the above-mentioned conventionally known on-off valve, the fluid pressure is applied to the upper surface and the lower surface of the annular piston provided integrally with the cylindrical valve body to move the valve body up and down. An operating fluid (air) pressure source is required, and in order to prevent leakage at the sliding portion of the tubular valve body, a seal material (packing) must be provided on the peripheral surface portion of the valve body to reduce sliding resistance. There were problems such as making it larger.

Further, in the above-mentioned prior art, there is a restriction on the pipe mounting posture like a check valve for ships, the main part material is made of metal, and the resistance in the flow path is large, so that the valve is opened and closed. Accordingly, there is a problem that durability is impaired due to wear of main parts due to noise and fluid.

The present invention solves the above-mentioned problems of the prior art, has a structure with a small fluid resistance, a small opening / closing stroke of the valve, a main part is less likely to be damaged by the fluid, and a reverse seal that maintains a reliable sealing property. It is intended to provide a stop valve.

[0010]

In order to achieve the above-mentioned object, the invention of claim 1 provides a ball-shaped main body portion having a fluid inlet port below and a valve seat connected to the inside thereof, and a fluid flow upward direction. A valve body is configured by integrally connecting a tubular cylinder portion provided with an outlet, and a tubular valve body is slidable inside the valve body so that the lower end abuts against the valve seat when descending. In the stored check valve, the outer peripheral portion of the tubular valve body and the inner surface of the valve body are connected via a diaphragm, and the lower surface of the diaphragm and the flow passage on the inlet side of the valve seat are communicated with each other. , A conical shape that urges the cylindrical valve body to abut against the valve seat by means of a compression spring mounted above the diaphragm, and the outer shape of the valve seat connected to the ball-shaped main body portion reduces the fluid flow resistance. And an inverted conical shape to increase the flow passage cross-sectional area of the ball-shaped main body. And respectively along the outer and inner peripheral surfaces of the ball-shaped body portion of the valve seat characterized in that a rectifying grooves of plural rows.

Further, the invention of claim 2 is characterized in that an elastomer is attached to at least one of the abutting portions of the valve seat and the tubular valve body to provide a simultaneous planar touch structure.

According to the third aspect of the present invention, both pressure receiving chambers formed on the inlet side and the outlet side of the diaphragm connecting the outer peripheral portion of the tubular valve body and the inner surface of the valve body are provided with a bypass valve. It is characterized by being connected by a bypass pipe.

[0013]

Since the present invention is constructed as described above,
According to the invention of claim 1, the following action is brought about. That is, when the fluid is flowing in the piping system, the fluid flows in from the lower fluid inflow port, and the outer peripheral surface of the conical valve seat connected to the ball-shaped main body and the inner peripheral surface of the ball-shaped main body. Through a plurality of straightening grooves respectively provided along with, the diaphragm pressure receiving portion is pressed against the elastic force of the compression spring, and the valve body is pushed upward to open the valve and flow out to the upper outlet. At this time, the flow of the pressure fluid flowing from below is such that the shape of the valve seat is streamlined as much as possible in order to reduce the fluid resistance, and a plurality of straightening grooves are provided in the gap with the inner surface of the main body. Through the road, it flows in an orderly fashion towards the upper outlet.

Since the inflow side (primary side) and the outflow side (secondary side) of the fluid of the tubular valve body are blocked by the diaphragm having a small sliding resistance, the sliding action of the valve body is concerned. The fluid sealability is maintained. Also, since the diaphragm has a large pressure receiving area, the strength of the compression spring (coil spring) should be selected according to the specification conditions such as standard, high load and low load, even if the fluid pressure varies. By installing it, the valve can be opened and closed smoothly, and the stroke of the valve body required for opening and closing can be shortened.
It enables high-speed opening and closing.

According to the second aspect of the present invention, in addition to the above-mentioned operation, an elastomer is attached to at least one of the abutting portions of the valve seat and the lower end portion of the tubular valve body, and the planar simultaneous touch is performed. Since it is formed in a structure, damage to the valve seat abutting portion is prevented when the valve seat is opened and closed by the lower end portion of the valve body, particularly when the valve is opened,
The sealability of the valve seat is maintained for a long period of time, and no metallic noise is generated at the time of contact.

Further, according to the invention of claim 3, it is formed on the inlet side (primary side) and the outlet side (secondary side) of the diaphragm that connects the outer peripheral portion of the tubular valve body and the inner surface of the valve body. Both pressure receiving chambers are connected by a bypass pipe equipped with a bypass valve.Therefore, when opening and closing the valve, the bypass valve of the bypass pipe is opened appropriately in advance to release the fluid pressure to the primary side. It is possible to buffer a sudden pressure change caused by opening or closing the valve, and prevent damage to the check valve, other devices, and pipelines.

[0017]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a vertical sectional view showing an embodiment of the present invention.
The left side of the Y line shows the state when the valve is closed, and the right side shows the state when the valve is open.

First, the state when the valve is closed on the left side of the line YY will be described. In the drawing, a ball-shaped main body 11 having a fluid inlet opening B at the bottom and a cylindrical cylinder portion 12 having an outlet opening C at the top are integrated by a connecting bolt 13 to form a valve body 1. Is formed. Inside the ball-shaped main body 11, a conical valve seat 14 having an outer shape that reduces the fluid flow resistance is screwed into the outlet side, and an inverted conical valve seat 15 is screwed into the inlet side to integrate them. The conical valve seat 14 on the outlet side is formed with a contact surface A portion of the valve body. Further, a valve seat cavity portion 15a is formed inside the valve seat, and the inlet side valve seat 1
A plurality of straightening grooves 17 are formed on the outer peripheral surface of No. 5, and a plurality of straightening grooves 18 are formed on the inner peripheral surface of the ball-shaped main body 11 so as to face the valve seat. In the figure, 19 is a corner portion for screwing formed on the outlet side valve seat 14 to be integrated with the inlet side valve seat 15, and the shape is not limited to that shown in the drawing.

On the other hand, a cylindrical valve body 21 is housed inside the valve body 1, and the cylindrical valve body 21 has a cylinder guide 12a formed on the inner surface of the cylindrical cylinder portion 12 and a ball-shaped main body portion. 11 is slidably housed along the inner surface of a valve body guide 11a formed on the inner surface of the valve seat contact surface A above. A diaphragm receiver 22 formed by bending a peripheral end portion of a ring-shaped portion downward is integrally formed on an outer peripheral portion at an intermediate position of the tubular valve body 21, and is formed by an upper surface of the ring-shaped portion and a coil spring 23. The inner peripheral portion is sandwiched by the lower surface of the pressed diaphragm retainer 24, and the outer peripheral portion is connected to the flange 12 of the cylindrical cylinder portion 12.
It is sandwiched between b and the flange 11b of the ball-shaped main body 11, and the diaphragm 25 is attached by bending the intermediate portion so as to correspond to the stroke of the tubular valve body 21. In the figure, 21a is a drill hole and 21b is a bolt.

Further, a bypass pipe 31 is installed so as to connect both pressure receiving chambers E and F formed on the inlet side (primary side) and the outlet side (secondary side) of the diaphragm 25, respectively. A bypass valve 32 is provided in the bypass pipe 31.

The contact surface A between the lower end of the tubular valve body 21 and the upper surface of the outlet side valve seat 14 is shown in FIG.
As shown in FIG.
Is attached to the metal valve seat 14 so as to come into contact therewith. FIG. 2B shows another embodiment, in which the elastomer 27
Is mounted on the valve seat 14 side and faces the metallic cylindrical valve body 21. The method of mounting the elastomer on the valve body 21 and the valve seat 14 includes an integral baking method in addition to the fitting method.

FIG. 3 shows still another embodiment. Elastomers 26 and 27 are attached to the contact surfaces on both sides of the tubular valve body 21 and the valve seat 14, respectively.

FIG. 4 and FIG. 5 are cross-sectional views of essential parts showing other embodiments. In these examples, the inner diameter of the tip of the valve body 21 is tapered, and when the valve is closed, it can be used for high-pressure fluid by sandwiching the width of simultaneous touch on the plane. By doing so, it plays a role of preventing damage to the tip of the valve body.

With the above construction, when the valve on the left side of the line YY in FIG. 1 is closed, the fluid flows from the lower opening B through the inlet side valve seat 15 and the outlet side valve seat 14, and 2 to 5 reach the contact surface A of the valve body 21, and the fluid further reaches the pressure receiving chamber E on the lower surface of the diaphragm receiver 22 through the gap of the valve body guide 11a. On the other hand, on the secondary side of the outlet C, the fluid pressure is applied to the diaphragm retainer 24, and the valve body 21 is pushed downward by the elastic force of the coil spring 23, and the valve seat 21 is adhered to the valve seat 14 to seal it. Holds sex.

Further, relates strokes required for opening of the valve body 21, in cross-sectional area ^{πD 2/4 = πD × D} / 4 of Formula valve bore below, D: diameter or Benza径, i.e., the diameter and the valve seat When the diameter is the same, the right side of the above equation is [circle of valve seat (πD)
X stroke (D / 4)]. That is, the valve body is D /
It means a cylindrical cross-sectional area at right angles to the flow through the valve seat opening when it is moved up by 4 strokes. Therefore, if the bore diameter and the valve seat diameter are the same, there is a valve stroke of 1/4 or more of the bore diameter. Thus, the total flow rate will flow. Thereby, the valve body 21
The moving distance of the valve becomes short, and therefore the valve can be opened and closed at high speed.

Next, the valve open state on the right side of the line YY in FIG. 1 will be described. In the figure, when the pressure fluid flows in through the opening B, it is pressed against the lower surface of the diaphragm receiver 22 from the gap of the valve body guide 11a through the flow passage D in the outer peripheral portion of the valve seats 15 and 14, and the elasticity of the coil spring 23 is increased. The valve body 21 is pushed upward as shown in FIG. At this time, the fluid in the pressure receiving chamber F that accommodates the coil spring 23 is discharged to the inside of the valve body 21 through the drill hole 21a, so that the raising action of the valve body 21 is not hindered.

When the fluid passes through the flow passage D in the outer peripheral portion of the valve seats 15 and 14, a plurality of straightening grooves 17 are formed on the outer peripheral surface of the valve seat 15 and the inner peripheral surface of the ball-shaped main body 11. , 18 are provided, noise and vibration due to the impact of fluids on the outlet side of the outlet side valve seat 14 are prevented, and local abrasion at the valve body tip portion and the like are prevented.

The valve seat rectifying groove 17 and the main body rectifying groove 1
The cross-sectional shape of FIG. 8 taken along line VI-VI in FIG. 1 is shown in FIG.
It is shown in (b). In the figure, the straightening grooves are arranged so as to face each other ((b) in the figure), and the grooves and the ridges are arranged so as to face each other ((a) in the figure), and the combination is arbitrary. . Further, it goes without saying that the shapes of the grooves and the ridges are not limited to those shown in FIG. Similarly, VII in FIG.
The sectional shape taken along the line -VII is shown in FIG. 7, and the number and shapes of the crests of the cylinder guide 12a in the figure are of course not limited to those in the figure.

The stopper when fully opened is restricted by the tip of the diaphragm retainer 24 coming into contact with the inner end of the cylinder portion 12.

According to this embodiment, the valve body 21 is located at the boundary surface between the fluid inflow side (primary side) and the outflow side (secondary side).
By introducing the fluid pressure flowing in the pipeline to the diaphragm 25 integrated with the coil 25, the valve can be opened and closed promptly, and the coil spring 23 can be operated until the fluid pressure changes from a slight pressure to a high pressure. Adjusting allows for automatic opening or closing of the valve. Such an action is achieved by the diaphragm 2 attached to the peripheral surface of the tubular valve body 21.
This is because the pressure receiving area can be increased by 5 and, on the other hand, it is
Compared with the one using a ring or the like, the sliding resistance required for opening and closing can be remarkably reduced.

The greatest feature of the diaphragm is that by simultaneously molding a reinforcing cloth or the like inside the diaphragm (cross section), the strength is excellent, deformation and penetration due to pressure reception are eliminated, sliding resistance is small, and a wide range of fluids are used. That is, it has a high cyclic strength such as compression, tension and bending.

Further, in FIG. 1, a bypass pipe 31 for connecting the primary side and the secondary side is provided at an intermediate portion between the main body portion 11 and the cylinder portion 12, and as a normal use method, the bypass valve 32 is slightly or slightly provided. By fully opening, noise, vibration, etc. due to the impact when the valve body 21 abuts on the valve seat 14 is prevented when the valve is suddenly closed, so that not only the check valve but also other equipment and pipelines can be prevented. It is possible to prevent damage. In addition, in the above-described embodiment, the structure in which the outlet end of the outlet side valve seat 14 is formed in a conical shape has been described, but any shape that reduces fluid flow resistance may be used.

[0033]

As described above, according to the present invention,
In the invention of claim 1, the outer peripheral portion of the tubular valve body and the inner surface of the valve body are connected via a diaphragm, and the lower surface of the diaphragm and the flow passage on the inlet side of the valve seat are communicated with each other. , A conical shape that urges the cylindrical valve body to abut against the valve seat by means of a compression spring mounted above the diaphragm, and the outer shape of the valve seat connected to the ball-shaped main body portion reduces the fluid flow resistance. And a conical shape to increase the flow passage cross-sectional area of the ball-shaped main body, and by providing a plurality of straightening grooves along the outer surface of the valve seat and the inner surface of the ball-shaped main body, respectively. The fluid resistance on the inlet and outlet sides of the valve seat can be reduced, and the multiple flow straightening grooves provided in the flow path between the valve seat and the main body allow the fluid to flow in an orderly manner toward the outlet, and also to open the valve. The pressure receiving part at the time of valve is made by the diaphragm with low sliding resistance. Since it is configured, there is no fluid leakage in the sliding part of the valve body, and the pressure receiving area of the diaphragm is large, so the valve can be opened and closed smoothly by exchanging the compression spring regardless of the fluid pressure. In addition, theoretically, high-speed opening / closing can be performed with a stroke of the valve body that is ¼ or more of the diameter.

According to the second aspect of the invention, an elastomer is attached to at least one of the abutting portions of the valve seat and the tubular valve body, and the planar simultaneous touch structure is adopted. The valve seat portion can be reliably sealed, and the valve body is not damaged by the fluid flow when the valve is opened.

Further, in the invention of claim 3, both pressure receiving chambers formed on the primary side and the secondary side of the diaphragm connecting the outer peripheral portion of the tubular valve body and the inner surface of the valve body are provided with the bypass valve. By connecting by bypass pipe,
It is possible to effectively buffer a sudden pressure change due to opening or closing of the valve, and prevent damage to the check valve, other devices, and the pipeline.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a check valve according to an embodiment of the present invention, in which a left side of a line Y-Y shows a closed state and a right side shows a opened state.

2 (a) and 2 (b) are cross-sectional views of essential parts showing different embodiments of the valve seat sealing surface.

FIG. 3 is a cross-sectional view of essential parts showing another embodiment of the valve seat sealing surface.

FIG. 4 is a sectional view of an essential part showing still another embodiment of the valve seat sealing surface.

FIG. 5 is a sectional view of an essential part showing still another embodiment of the valve seat sealing surface.

6A and 6B are sectional views taken along line VI-VI in FIG. 1, showing different embodiments.

7 is a sectional view taken along line VII-VII of FIG.

[Explanation of symbols]

 1 Valve body 11 Ball-shaped body part 11a Valve body guide 11b Flange 12 Cylindrical cylinder part 12a Cylinder guide 12b Flange 13 Bolt 14 Outlet side valve seat 15 Inlet side valve seat 15a Valve seat cavity part 16 Connecting part 17,18 Rectification groove 19 Corner for screwing 21 Cylindrical valve body 21a Drilling hole 21b Bolt 22 Diaphragm receiving 23 Coil spring 24 Diaphragm retainer 25 Diaphragm 31 Bypass pipe 32 Bypass valve A Contact surface B, C Opening D Flow path E, F Pressure receiving chamber

Claims (3)

[Claims] 1. A valve body is formed by integrally connecting a ball-shaped main body portion having a fluid inlet port below and a valve seat connected to the inside thereof, and a cylindrical cylinder portion having an upper fluid outlet port. ,
A check valve in which a tubular valve body is slidably housed inside the valve body so that a lower end of the valve body contacts the valve seat when the valve body is lowered, an outer peripheral portion of the tubular valve body and an inner surface of the valve body. Are connected via a diaphragm to connect the lower surface of the diaphragm to the flow passage on the inlet side of the valve seat, and the cylindrical valve element is brought into contact with the valve seat by a compression spring mounted above the diaphragm. The outer shape of the valve seat connected to the ball-shaped main body is formed into a conical shape and an inverted conical shape that reduce the fluid flow resistance to increase the flow passage cross-sectional area of the ball-shaped main body. A check valve, wherein a plurality of straightening grooves are provided along the outer peripheral surface of the valve seat and the inner peripheral surface of the ball-shaped main body. 2. The check valve according to claim 1, wherein an elastomer is attached to at least one of the abutting portions of the valve seat and the tubular valve body to have a plane simultaneous touch structure. 3. The pressure receiving chambers formed on the inlet side and the outlet side of the diaphragm connecting the outer peripheral portion of the tubular valve body and the inner surface of the valve body are connected by a bypass pipe equipped with a bypass valve. The check valve according to claim 1 or 2, which is characterized.