JPH0470102B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a valve, and more specifically to a method for manufacturing a valve in which a valve body and a bonnet are integrally formed by press working a pipe material. Regarding the method.

(Prior art) Conventionally, the manufacturing method of valves for fluid control has been to integrally form a main body part and a bonnet part by casting, forging, machining, etc. a metal material, and then insert a valve body inside the body part and bonnet part. After storing the valve stem, insert the valve stem through the bonnet and connect it to the valve body, insert the sealing member, valve stem retainer, valve lever, etc. into the bonnet, and tighten each of the above parts by bolting or other means. Methods of fixing and preventing the valve stem from falling out were commonly used.

However, all of these manufacturing methods require complicated processes such as cutting to finish the valve case, and many steps are required to seal the bonnet and fix and prevent the valve stem from falling out. Since it requires parts and labor-intensive work, it has the drawback of lacking mass productivity and increasing manufacturing costs. Furthermore, in the case of casting and forging, the wall thickness inevitably increases in order to ensure a certain level of strength, and as a result, the weight of the final product also increases, making it inconvenient to handle. Furthermore, in the case of cutting, a lot of shavings are generated, which further increases the cost.

In response, various valve manufacturing methods have been proposed in which various commercially available metal pipe materials are used as raw materials for the valve body.
One example is the technique described in Publication No. 165081.
As shown in Fig. 7, a hole 102 for inserting the valve stem is previously drilled in a commercially available pipe material 100 of a predetermined size, and the outer peripheral surface of one end of the pipe is caulked so that a positioning hole 102 protrudes inside. A plurality of protrusions 104 are provided. Then, by inserting the valve body 106 etc. from the other end of the pipe and caulking the other end of the pipe 100, the valve body 106 etc. are held inside the pipe, and further the above-mentioned hole 102
After inserting the valve stem 108 and coupling it with the valve body, the sealing member 110 and the valve lever 112 are inserted into the valve stem 108, and the bolts 114 are tightened to fix these parts 110, 112 and prevent the valve stem 108 from coming off. This is what we do.

(Problem to be Solved by the Invention) According to this, it is possible to manufacture a large quantity of light and inexpensive valves with a simple manufacturing process. However, in this case, only the valve body is formed of a pipe material, so as mentioned above, the bonnet part must be omitted and the seal member, valve lever, etc. must be bolted directly to the valve body. Therefore, since each of the above-mentioned parts is constantly exposed to the outside air, corrosion, rust, etc. are likely to occur, which poses a problem in terms of durability. Also,
It is not very aesthetically pleasing either. In order to avoid these problems, it is possible to manufacture the bonnet separately and join it to the main body, but this would defeat the purpose of reducing the number of manufacturing steps and parts and improving mass productivity. Become something.

The present invention aims to solve the conventional problems as described above.

(Means for solving the problem) Cut a short pipe of the length necessary to construct the valve part from a commercially available pipe, use this short pipe as a valve case, and install a valve body inside it to make the valve. In the manufacturing method of the valve, the present invention integrally forms a cylindrical bonnet portion protruding from the outer peripheral surface of the short tube in a direction perpendicular to the tube axis by press-molding the short tube. A valve rod is housed inside the end pipe from the open end of the short pipe, and a valve rod is inserted through the upper opening of the bonnet part to connect the lower end to the valve element, and the valve rod has a valve rod passage hole. It is characterized in that the presser foot is fitted into the upper opening of the bonnet part.

(Function) As described above, since the valve body and the bonnet are integrally molded using commercially available pipe materials, lightweight and inexpensive valves can be mass-produced with a simple manufacturing process, and the sealing member and valve stem parts can be made into a bonnet. Since it can be stored inside the unit, durability is improved and aesthetic requirements can also be satisfied. In addition, the fixing of the seal member within the bonnet and the prevention of the valve stem from coming off can be accomplished with a small number of parts and simple steps, further improving mass productivity.

(Example) The present invention will be described below based on the illustrated example. The method for manufacturing a valve according to the present invention begins by creating a valve case, as shown in FIGS. 1a to 1c. That is, as shown in FIG. 1a, a short tube 10 cut out from a commercially available tube to a length necessary to make a valve case is used as a material for the valve body 12. Then, by press-molding the short tube 10, the bonnet part 14 is formed integrally with the main body part 12 on the outer peripheral surface of the main body part 12. As shown in FIG. 1B, the bonnet portion 14 has a substantially cylindrical shape, and is formed on the outer peripheral surface of the central portion of the main body portion 12 in the longitudinal direction so as to be perpendicular to its axis. As an example of the press-forming method for the bonnet part 14, as shown in FIGS. The short tube 10 is set on top of the bonnet, a punch 22 having a convex shape corresponding to the inside shape of the bonnet portion 14 is installed inside the short tube 10 in a predetermined manner, and pressure is applied to the punch 20 (see c in the same figure). ，
d) By doing so. Note that the reference numeral 24 is a wrinkle suppressor. Of course, other methods may be used as long as the main body portion 12 and the bonnet portion 14 can be integrally molded from the short tube 10. As described above, the main body part 12 and the bonnet part 14 are integrally molded from the short pipe 10, but if the upper end of the cylindrical bonnet 14 is irregular, that part may be cut horizontally or ground to shape it. Then, an opening 26 is formed (FIG. 1c).

Next, by expanding both ends of the main body part 12, a connecting part 28 for connecting to another pipe material is formed (FIG. 1c). Furthermore, at a portion a predetermined distance from one end (the left end in the figure) of the main body 12,
A first groove 30 for positioning and fixing the valve body is formed by applying pressure with a roller or the like along its outer peripheral surface. Alternatively, although not shown in the drawings, the valve body may be positioned by forming a plurality of protrusions on the inner circumferential surface of the main body 12 that protrude inward from the outside by punching or the like instead of the grooves 30.・It may be fixed.

By going through the above steps, a valve case having a cylindrical bonnet is completed from ordinary piping material (FIG. 1c).

Next, the valve body is stored in the valve case. At this time, as shown in FIG. 3, the seat retainer 31a is first inserted through the right end opening 32 of the main body 12 and brought into contact with the groove 30. Next, a sealing O-ring 34a and a seat ring 36a are inserted in the same manner. Then, after inserting the valve body 40 (ball valve body), which has a substantially spherical shape and has a through hole 38 for fluid passage, the seat ring 36b,
Insert each member in the order of O-ring 34b and seat retainer 31b, and remove each member 31a, 31b, 34.
A, 34b, 36a, and 36b sandwich the valve body 40 from both sides, and the valve body 40 is hollowly supported inside the main body portion 12. Then, a second groove 42 is formed in the outer end of the seat retainer 31b in the same manner as the first groove 30. As a result, the valve body 40 is inserted into the left and right grooves 3.
Seat retainers 31a, 31b between 0 and 42,
It will be clamped and fixed via the seat rings 36a and 36b.

After the valve body 40 is stored inside the main body 12 as described above, the valve stem 44 is inserted from the opening 26 side of the bonnet 14 toward the inside of the main body 12, and then inserted into the valve body 40 using an appropriate means. combine. The valve stem 4
4, a first step 46 is formed on the lower end side (valve body 40 side) and a second step 48 is formed thereon, and a sealing part is formed between the two steps. An annular packing 50 is fitted. When inserting the valve stem 44, the valve stem retainer 52 is fitted into the opening 26 of the bonnet portion 14 to fix the valve stem 44. As shown in FIG. 4, the valve stem retainer 52 has a cylindrical shape in which a valve stem through hole 56 is formed in a cylindrical main body 54, and the radius of the upper surface 58 is equal to the wall thickness of the bonnet 14. The radius of the bottom surface portion 60 is longer than that corresponding to the radius of the top surface portion 5 .
8 has an edge 62 formed therein. Furthermore, the upper surface portion 58 is provided with two protrusions 64, 6 for regulating rotation of the valve stem.
6 are provided at intervals of approximately 90 degrees from the center of the upper surface portion 58.

After engaging the valve stem presser 52 as described above, the valve stem 4
The valve according to the present invention is completed by attaching a stopper 72 and a lever 74 for opening and closing the valve to 4 by a predetermined means (FIGS. 3 and 6). Although FIG. 3 shows the valve in an open state, the lever 74 is
The valve can be closed by rotating it 90 degrees. In addition, the stopper 72 attached to the valve stem 44
are the two protrusions 64, 6 provided on the valve stem retainer 52.
6, the valve body 40 is designed to be rotatable only within a range of 90 degrees.

In this embodiment, a substantially spherical ball valve is used as the valve body, but the present invention is not limited to this; it can be stored in the main body 12, and the valve can be opened and closed by its rotation. It may be of any shape as long as it exists.

(Effects of the Invention) The present invention has the above configuration, and can manufacture lightweight and inexpensive valves in large quantities through a simple process using commercially available pipe materials. In particular, since the valve body and the bonnet are integrally molded, it is possible to effectively prevent corrosion and rust of the sealing member and the valve stem, which would occur if the valve was constructed without the bonnet.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the valve manufacturing method according to the present invention, FIG. 1 is an explanatory perspective view showing the process of forming the valve case, and FIG. 2 is a cross-sectional view showing the method of forming the bonnet part. Fig. 3 is a sectional view showing the completed state of the present invention, Fig. 4 is a perspective view showing an example of the shape of the valve stem holder, and Fig. 5 is an explanatory perspective view showing a state in which the valve stem holder is inserted into the valve stem. , FIG. 6 is an overall perspective view showing the completed state of the present invention. Further, FIG. 7 is a sectional view showing a conventional valve. 10...Short pipe, 12...Valve body, 14...
... Bonnet part, 26 ... Opening, 40 ... Valve body,
44... Valve stem, 46, 48... Step portion, 52... Valve stem holder.

Claims (1)

[Claims] 1. A method for manufacturing a valve, in which a short pipe of the length necessary to construct the valve part is cut from a commercially available pipe for piping, and this short pipe is used as a valve case, and a valve body is installed inside the short pipe to construct the valve, By press-molding the short tube, a cylindrical bonnet portion protruding from the outer peripheral surface of the short tube in a direction perpendicular to the tube axis is integrally formed, and a valve body is inserted into the end tube from the open end of the short tube. and inserting a valve stem through the upper opening of the bonnet portion and coupling its lower end to the valve body, and fitting a valve stem retainer having a valve stem through hole into the upper opening of the bonnet portion. A method for manufacturing a valve characterized by: