MXPA99010543A - Method of making ball valves - Google Patents

Abstract

A method of making ball valves, including the steps of forging two symmetrical ball valve halves into shape such that they each have a spherically curved outer wall and a cylindrical inner wall joined at one end to the outer wall and otherwise separated by a channel;bringing the ball valve halves together to form a spherical ball valve;friction welding the ball valve halves as a whole so that reinforcing ribs are formedon the welding surfaces due to fusion and a straight flow path is defined in the ball valve;using a punch with a ram having a diameter corresponding to that of the straight flow path of the ball valve to remove the reinforcing rib on the inner wall of the straight flow path so that the wall surface of the straight flow path is smooth;and processing the surface of the ball valve. A weight-reduced hollow ball valve having a straight flow channel in the center thereof is therefore accomplished to allow smooth flow of water therethrough, and reduction in the weight of the ball valve borne by water stopping washers on both sides of the ball valve to thereby prolong the service life of the water stopping washers.

Description

METHOD FOR MANUFACTURING SPHERICAL VALVES (a) Field of Invention: The present invention relates generally to a method for the manufacture of spherical valves, and more particularly to a method in which two symmetrical spherical valve halves are forged to form, and are welded together using friction welding so as to obtain a spherical ball valve recessed with a channel for right flow in the center. Pierces formed on the weld surface are removed by drilling in the right flow path to form smooth surfaces. The surface of the ball valve is finally processed to obtain a ball valve with a reduced weight. In practice, the load supported by the washers that stop the water can be reduced (seats) on both sides of the ball valve to prolong the service life of the washers that stop the water. In addition, the right flow channel allows a laminar or uniform flow through it; The ball valve has good structural strength, and manufacturing costs can be reduced.

REF .: 32135 (b) Description of the previous technique: The spherical valve referred to herein is, as shown in Figure 1, a spherical valve structure resting against washers that stop the water 51 (seats) of a valve for water service and that rotates to control the opening and closing a water tap With reference to figure 2, in the past, spherical valves were made by casting. The cast iron is poured into a mold, and a semi-finished product is separated from the mold in the form of a sphere once solidified or dried. Then the surface of the same is processed and the burrs are removed to obtain as a product a spherical valve.

However, there are many disadvantages with a ball valve manufactured with the method described above. 1. As the conventional ball valve is formed by casting, during the casting there are air bubbles inside, during formation, in order to reduce the number of pores formed on the surface of the ball valve, the thickness of the valve is deliberately increased spherical After its formation, the surface layer is processed using a lathe. It can be seen that the proportion of wasted material is high, and pores remain on the surface of the ball valve. As a result, the surface of the ball valve is not in a tight fit with the washers that stop the water (seats) on both sides of the tap water hole, and the water drips or leaks through the pores of the valve. the ball valve. Therefore, as can be seen, it is impossible to form a pore-free spherical valve using such a casting method.

In addition (as shown in Figure 2) the conventional ball valve has a hollowed out substantially spherical interior. When the water from the tap water hole flows through the recessed interior of the ball valve, it strikes against the walls of the substantially spherical recessed interior of the ball valve, so that bubbles are formed in the pipe. These - Air bubbles prevent the flat or laminar flow of the liquid, which causes the formation of turbulence.

In order to overcome the aforementioned disadvantages, the forging process for the manufacture of spherical valves is adopted.Figure 3, a steel material is heated at high temperatures and directly forged in a semi-finished, spherical product. solid After the surface is processed, a spherical valve structure 3 is obtained.

However, although the manufacture of spherical valves using forging methods can eliminate the disadvantages of molten ball valves, there are other problems to be solved.

Since a solid ball valve is heavy, when a ball valve pushes against the water stop washers (seats) 51 of the ball valve for water service 5 and rotates, the weight of the ball valve on the washers that stop the water (since both side portions of the ball valve are inserted inside the washers that stop the water (seats)) causes the washers that stop the water to deform after a period of time, and therefore these become vulnerable to wear during the rotation of the ball valve. As a result of deformation and wear, the ball valve can no longer be in a tight fit or position with the washers that stop the water (seats) on both sides, and then clearances are formed. Therefore, even when the ball valve closes, leakage occurs in the pipe. And when a technician comes to maintain the pipe using welding, an explosion can easily occur.

BRIEF DESCRIPTION OF THE INVENTION A first objective of the present invention is to provide a method for manufacturing a ball valve having a reduced weight. According to the method of the present invention, two spherical valve halves are forged by heat to form them and friction welded together to form a spherical valve having a recessed interior defining a right flow channel, so as to that the weight of the ball valve supported by the washers that stop the water (seats) on both sides of it, reduce the rotational force of the ball valve to reduce the load of the washers that stop the water (seats), which prolongs the service life of the ball valve.

Another object of the present invention is to provide a method for manufacturing a ball valve having a right or linear flow channel to allow a laminar flow of water, in which the two halves of the ball valve are forged in shape and form. they couple together to form a ball valve using friction welding so that a laminar flow channel is defined in the center of the ball valve to allow a laminar flow of water thereby preventing turbulence formation.

A further object of the present invention is to provide a method for the manufacture of a ball valve in a rapid manner, in which the ball valve together with the right flow channel thereof are formed by forging and friction welding, without the need to drill an internal flow hole using a lathe as in the prior art, thus increasing the production speed.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will now be understood more clearly from the following detailed description and the accompanying drawings, in which, Figure 1, illustrates the relationship between a valve for service of ordinary water and a ball valve; Figure 2 is a sectional plan view of the conventional molten ball valve; Figure 3 is a sectional plan view of the conventional forged ball valve; Figure 4 is a perspective view with the separated parts of the ball valve of the present invention; And Figure 5 is a sectional plane view of the ball valve of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED MODALITY With reference to Figures 4 and 5, a method for manufacturing ball valves according to the present invention essentially comprises the steps of (A) forging to shape; (B) friction welding, and (C) process the product.

In step (A), two symmetrical spherical valve halves 11 are fabricated by forging so that each of them has a cross section in the form of a tH7.

Frictional welding refers to the use of high-speed rotation to cause the metal contact surfaces to be welded together as a whole. In step (B), the halves 11 of the ball valve are brought together to form a ball valve 1, and friction welding is employed to cause the halves 11 of the ball valve to be integrally welded so as to form a flange of reinforcement 13 on the surfaces of the weld due to fusion.

In step (C), a punch having a bore of a diameter corresponding to that of a right flow channel 12 of the ball valve 1 is used to separate the flange 13 on the inner wall of the right flow channel 12 in the center of the ball valve 1 so that the surface of the wall of the right flow channel 12 is smooth. Then a turning tool is used to process the surface of the ball valve 1.

By means of the above steps of the present invention, a recessed ball valve with a reduced weight is obtained. As the right flow channel 12 is located in the center of the ball valve 1, the weight supported by the washers that stop the water 51 (seats) on both sides of the ball valve 1 can be reduced, the rotational force of the ball valve 1 can be lowered, and the load on the washers can also be relieved that stop the water (seats) 51, which prolongs the service life of the same. In addition, the right flow channel 12 ensures the laminar flow of water through it.

The advantages of the present invention are set forth below: 1. Weight reduction; • 'The ball valve of the present invention is formed using forging and friction welding so that it has a recessed interior with a channel for right flow in the center thereof. Due to such construction, the weight of the ball valve supported by the water stop washers (seats) on both sides thereof can be reduced; the rotational force of the ball valve can be decreased; and also can alleviate the load of the washers that stop the water, which prolongs the service life of the valve spherical. 2. A laminar flow of water: After its formation, the ball valve will have a right flow channel at its center to allow the laminar flow of water through it, without causing any turbulence.

Faster production: As the spherical valve of this The invention together with the right flow channel thereof is formed by forging and friction welding, it is not necessary to drill an internal flow hole using a perforator as in the prior art. Therefore, it can increase the production speed.

Although the present invention has been illustrated and described with reference to the preferred embodiment thereof, it should be understood that it is not intended in any way to limit the details of such an embodiment but is susceptible to numerous modifications within the scope of the appended claims.

It is noted that in relation to this date, the best method known to the applicant, to implement said invention is that which is clear from the manufacture of the objects to which it refers.

Having described the invention as above, property is claimed as contained in the following:

Claims (1)

1. A method for the manufacture of spherical valves, characterized in that it comprises the steps of: a. forging two symmetrical ball valve halves to form them so that each of these has a W-shaped cross-section; b. attaching said spherical valve halves to form a spherical ball valve, and frictionally welding said spherical valve halves as a whole so that reinforcing beads are formed on the weld surfaces due to fusion, and a trajectory is defined of right flow in said ball valve; and c. using a punch with a bore having a diameter corresponding to said right flow path of said spherical valve to remove the reinforcement flanges in the inner wall of said right flow path so that the wall surface of said path of right flow is smooth; and process the surface of said ball valve, whereby: a reduced-weight recessed ball valve is obtained having a right flow channel in the center thereof to allow the laminar flow of water through it, and the weight reduction of the ball valve supported by the washers that stop the flow. water (seats) on both sides of the ball valve, which prolongs the service life of the washers that stop the water (seats).