JPS5940606Y2 - ball valve - Google Patents

Description

[Detailed explanation of the idea] Industrial applications This idea will help improve ball valves.

Therefore, the industrial field of application of this invention is the field of manufacturing and using valves.

BACKGROUND OF THE INVENTION The ball valve to be improved by this invention includes a valve body having a generally hollow cylindrical body, and a hollow and generally spherical valve body provided rotatably within the cylindrical hollow portion of the valve body. A pair of symmetrically arranged hollow unions that can be fitted and removed from both ends in the cylindrical hollow part of the main body of the valve body, and these unions can be press-contacted from the outside. Advantageously, the tank has a pair of body caps disposed on the valve body, and a pair of cap nuts that are removably screwed together with the main body of the valve body to engage and disconnect the body cap from the union. bottomed out.

An example of this type of conventional ball valve is the one described in Japanese Utility Model Application Publication No. 51-28532.

By the way, when this type of ball valve is in a blocked state,
When the cap nut on the downstream side is loosened or removed, the ball-shaped valve member moves very slightly downstream due to the pressure of the fluid acting from the upstream side, and the contact between the valve member and the sealing member is caused. A gap is created between them, and fluid often leaks.

For this purpose, a stopper is provided that spans between the valve body and the union, and by stopping the movement of the union, it indirectly prevents the valve member from moving downstream as described above. has already been proposed, but it has the disadvantage that processing and assembling the stopper are time-consuming.

Therefore, in order to achieve an effective and appropriate sealing effect in this case, the material and arrangement of the ring-shaped seal member interposed between each union and the ball-shaped valve member play an important role. However, as a prior art related to this, Japanese Utility Model Publication No. 46-21920 can be mentioned.

The gist of this prior art is that the inner surface of the seat ring 1 is machined with an oblique plane 2, a single row or multiple rows of annular grooves 8 are bored around the oblique plane 2, and the annular groove 8 has a stopcock body 5
This is a seat ring for a spherical cock into which a ring 4 with a circular cross section made of phosphor bronze, brass, stainless steel, etc. is fitted and fits into contact with the spherical surface of the cock.

Although the material of the sealing member in this conventional device is not Teflon (registered trademark) and is made of metal such as phosphor bronze, brass, or stainless steel, there is no need to discuss the difference in material, but it is possible to use single-row or multi-row seals. As a means for elastically pressurizing the seat ring 1, which is usually made of steel, and supporting the seat ring 4 from the outside to the inside, a cross section that expands in response to the pressure of the fluid flow is used. A U-shaped hydraulic backing 15 is used to pressurize the stopcock body 1, ie, the valve ball, from behind, and it is clear that this member is also made of metal.

By the way, the proposed device is mainly intended for use with liquid phase substances such as water, and is particularly suitable for use with substances containing corrosive acids. Since the purpose is to provide an interception that avoids the use of metal parts as much as possible, even if such a hydraulic backing 15 has the desired self-expanding property, overall there are too many It is extremely inappropriate to have several metal parts.

By the way, regarding the seat ring, Japanese Utility Model Publication No. 17839/1989 discloses a conventional technique that is somewhat similar to that used in the device of the present invention.

Particularly in FIG. 2 of this publication, a ring-shaped rubber 24 with excellent flexibility is housed at the bottom side of an annular seal member housing groove 23 provided in a support tube 21, and a thin metal plate 25 is placed on the side surface of the ring-shaped rubber 24. Furthermore, a ring-shaped sealing member 26 made of Teflon (registered trademark) or the like is inserted into the front side of the housing groove 23, and its protruding tip is brought into contact with the ball valve body 5, and the port I is inserted from the lateral direction. - 27 are intertwined and the above-mentioned rubber 24 is pressed.

However, in such a device, it is necessary to use a very large number of bolts 27 in order to achieve a uniform pressurizing effect over the entire circumference of the sealing member, which, together with the metal plate 25, are of course made of metal. Therefore, it is extremely unsuitable for applications such as the proposed product.

Problems to be Solved by the Invention Even when the three types of prior art described above are integrated, the following problems to be solved are as follows: (1) When the valve is opened and closed, the ball-shaped The supporting state of the valve member changes, and when the valve is opened, sliding in parallel to the flow path direction is ensured, simplifying assembly, but when the valve is closed, it is held in a fixed position, To enable the valve member to resist fluid pressure from the upstream side.

(2) Avoid using metal parts as much as possible in each part of the valve device, especially important parts, so that liquids containing acids and the like can be treated appropriately.

(3) When the cap nut or union on the downstream side is loosened, even if the seal gap slightly expands due to the fluid pressure on the upstream side, the upstream seal assembly will self-expand only elastically. A sealing state that is in pressure contact with the ball-shaped valve member can still be maintained.

The following three points are required to be met simultaneously.

The present invention is a so-called selective design of an all-plastic ball valve that satisfies these requirements.

Means for Solving the Problems (1) In the ball valve of the present invention, as a starting point that is the object of improvement, there is a valve body having a hollow cylindrical body, and a cylindrical shape of the valve body. A hollow, generally spherical valve member rotatably provided within the hollow portion, and a pair of symmetrically arranged hollow valve members that are removably fit into the cylindrical hollow portion of the main body portion of the valve body. unions, a pair of body caps arranged so that they can be pressed against these unions from the outside, and a pair of body caps that are removably screwed together with the main body of the valve body so that the body caps can be connected to and removed from the unions. Start with an all-plastic ball valve that has a pair of cap nuts that hold the valve in place.

This structure itself corresponds to a known structure.

(2) In the present invention, a slot (see 3c in Fig. 4) is formed on the outer surface of the seat of the valve member, which extends parallel to the fluid flow path when the valve is open and extends perpendicularly to the fluid flow path when the valve is closed. and an inward protrusion protruding from the inner wall surface of the shaft hole of the main body portion of the valve body is engaged with the slot.

Thereby, the first problem mentioned above can be solved.

Next, the second structural feature of the present device is that the ring-shaped seal member interposed between each union and the ball-shaped valve member is a hard Teflon (registered trademark) ring;
The bottom of the tank is backed up by a rubber elastic lining that backs it up from the outside.In particular, the rubber elastic lining allows the receiver to be completely sealed without having a pressure adjustment screw in the deepest part of the groove. It is to be arranged in such a way.

This ensures fluid sealing when the downstream cap nut is loosened or removed when the valve is closed, due to the action of the combination seal ring and the fact that the valve ball is reliably held in place at the stop position of the valve. This can be done on the upstream side by releasing the stored energy of the backing rubber elastic body.

The on/off operation of the valve in the functional device is the same as in the conventional device.

However, since the ball-shaped valve member is in a different retention state when the valve is open and closed, the operation of assembling the ball-shaped valve member from the side and ensuring a seal on the upstream side when the valve is closed are required. will be carried out reliably.

Furthermore, since the use of metal parts is kept to a minimum as a whole, acid solutions and the like can be treated safely and advantageously.

In the drawings of the embodiment, reference numeral 1 denotes a valve main body having a main body portion IA having a generally hollow cylindrical shape.

Reference numeral 3 designates a generally spherical valve member that is rotatably provided within the cylindrical hollow portion 1B of the valve body 1.

Reference numerals 2 and 2' designate a pair of symmetrical hollow unions that are disposed in the cylindrical hollow portion 1B of the main body portion 1A of the valve body 1 so as to be able to be fitted and removed from both ends thereof.

Reference numeral 4.4' designates a pair of body caps which are disposed so as to be able to press against these unions 2 and 2' from the outside.

13, 13' are removably screwed together with the main body part 1A of the valve body 1, and the body caps 4, 4' are connected to the union 2,
2' are a pair of camp nuts that are engaged and disengaged from each other.

In the present invention, the ring-shaped sealing member interposed between each union 2゜2' and the ball-shaped valve member 3 is backed up by a hard Teflon (registered trademark) ring 6, which is also backed up from the outside. Similarly, a ring-shaped lining rubber elastic body 7
When the cap nut 13, 13' on the downstream side (the right side in Figs. 1 and 4) is loosened or removed when the valve is closed, the fluid is sealed and the accumulation in the rubber elastic body 7 is prevented. This is done on the upstream side by releasing energy.

In this case, in addition to the above, a slot 3c is provided on the bottom outer surface of the valve member 3, which extends parallel to the fluid flow path when the valve is open and extends perpendicularly to the fluid flow path when the valve is closed. An inward protrusion 5 protruding from the inner wall surface of the shaft hole of the main body portion 1A is engaged with the slot 3c.

In the embodiment shown in FIG. 1, this inward protrusion 5 is located below the central portion of the main body portion IA of the valve body 1 along the vertical axis B-B' of the valve.
It is in the form of a removable plug that is provided in a female threaded hole 1b provided along the main body 1 so as to project slightly inward from below.
It is in the form of a fixed inward projection that is integral with A.

In order to distinguish between the two, they are designated by the reference numeral 5' in FIG.

Note that 3a is a hole passing through the valve member in the horizontal direction,
Of course, it is for forming a flow path, and FIG. 1 shows the valve in its open position, with the hole 3a aligned along the horizontal axis A-A' of the valve.

On the other hand, when the handle 11 is turned 90 degrees from the position shown in FIG. 1, the movement is transmitted to the valve member 3 via the valve shaft 10, and the valve member 3 is brought to the closed position.

Of course, in this position the hole 3a is at a position perpendicular to the axis AA'.

Reference numeral 12 denotes a bolt for fixing the handle 11 to the valve shaft 10.

In addition, the Teflon (registered trademark) ring on the upstream side is numbered 6,
The Teflon ring on the downstream side is designated by the numeral 6', the ring-shaped rubber elastic lining on the upstream side is designated by the numeral 7, and the one on the downstream side is designated by the numeral 7'.

In the modification shown in FIG. 5, the Teflon ring is designated by 6'' and the rubber elastic backing is designated by 7''.

The upper end of the valve member 3 has a horizontal groove 3b (see Figure 2).
is provided and receives the enlarged end portion 10A of the valve stem 10.

The direction of extension of the horizontal groove 3b and the enlarged end portion 10A is the horizontal groove A-A' when the valve is open, and therefore along the fluid flow path, but when the valve is closed, it is along the flow path. and are perpendicular to each other, so that the valve member 3 is not pushed downstream when the valve is closed.

Note that most of the valve shaft 10 is arranged above the valve body 1A and along the vertical axis B-B' of the valve.
It is fitted into a hollow cylindrical receiving portion 1a and is supported to allow correct rotational movement.

8.8' is a seal provided between the valve body 1 and the unions 2, 2', and 9, 9' are O-rings provided between the valve body 1 and the body caps 4, 4'. .

The fact that 4a and 4a' are female threaded parts provided on the body caps 4 and 4', and these are connected to the male threaded part of the piping (not shown) by threaded connection is as follows.
As is well known, the slot 3c is shown as a hole in FIG. 1, but is actually in the shape of a long hole as shown in FIG.

In this case, when the valve member is brought into the closed position, the inwardly directed projections 5 or 5' engage the longitudinal side walls of the slots 5' which are now brought into a position perpendicular to the fluid flow path seen from the entire valve. When engaged, movement of the valve member 3 in the downstream direction is actively prevented, which is extremely effective in preventing the desired fluid leakage, and is compatible with the unique structure of the sealing member of the elastic force sealing type. Therefore, the original effect can be more fully ensured.

Furthermore, the valve member 3 can be assembled very easily.

Effects of the invention Therefore, according to the invention, the required sealing effect is sufficiently achieved, and even if the downstream cap nut is loosened or removed at the stop position, the fluid will not flow out. This has the effect that there is no risk of leakage to the downstream side.

Additionally, since there are almost no metal parts as a whole, acid solutions and the like can be effectively treated.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing the ball valve of the present invention in its open state, Fig. 2 is a cross-sectional view of the ball-shaped valve member, Fig. 3 is a reverse view of the valve member as viewed from below, and Fig. 4 1 is a vertical sectional view similar to FIG. 1 showing a modified embodiment of the ball valve, and FIG. 5 is an enlarged partial vertical sectional view of the essential parts of a modified embodiment of the combination seal member essential to the present invention. It is a diagram. In these figures, 1...valve body, IA...
...Body part, 1a... Receiving part, 1b...
...Female screw hole, 2゜2'...Union, 3...
... Valve member, 3a ... Hole, 3c ...
・Slot, 4, 4'...Body cap, 5
．． 5'... Introvert process, 6. 6', 6"...
...Teflon (registered trademark) ring, 7.7', 7"
...Rubber elastic lining, 8...Seal member, 9...0 ring, 10...Valve shaft, IOA...Terminal enlargement Part, 11...Handle, 12...Tighten with bolt, 13.13'
...Cap Nut.

Claims (1)

[Scope of utility model registration request] A valve body having an outline hollow cylindrical body part, a hollow and roughly spherical valve member rotatably provided in the cylindrical hollow member of the valve body, and a cylindrical hollow part of the main body part of the valve body. A pair of symmetrically arranged hollow unions that can be fitted and removed from both ends within the valve body, a pair of body caps that can be pressed against these unions from the outside, and a valve body. and a pair of cap nuts that are removably screwed together to engage and disengage the body cap from the union, and are parallel to the fluid flow path when the valve is open, relative to the outer surface of the seat of the valve member. When the valve is closed, a slot is provided that extends perpendicularly to the fluid flow path, and an inward protrusion that protrudes from the inner wall surface of the shaft hole in the main body of the valve body is engaged with the slot, and each union and The ring-shaped sealing member interposed between the ball-shaped valve member is formed at the bottom of the tank by a hard Teflon (registered trademark) ring and a rubber elastic lining that backs it up from the outside. The body is installed so that the receiver is completely sealed without having a pressure adjustment screw in the innermost part of the groove, and when the downstream cap nut is loosened or removed when closing the valve. A ball valve characterized in that fluid sealing is performed on the upstream side by releasing stored energy from a rubber elastic lining.