KR20090081462A - Lining method of valve with protrusion and valve with protrusion with lining - Google Patents

Abstract

The present invention relates to a lining method of a valve, and more particularly, to a lining method of a valve having a protrusion and a valve having the lining.

A lining method of a valve having a protrusion according to a preferred feature of the present invention includes a tubular body portion, a flange portion formed at one end of the body portion, and a tubular protrusion portion formed at the other end of the flange portion to communicate with the body portion. A method of lining a valve comprising: (A) a rotational molding step of lining an inner surface of the valve, or an inner surface of the valve and an upper surface of at least a part of the protrusion by a conventional rotational molding method; (B) a press-fit step of manufacturing a protrusion outer lining portion for lining the outer portion of the protrusion which is not lined by the rotational molding step and press-fits into the protrusion; (C) a welding step of melting the boundary between the portion lined by the rotational molding step and the protruding outer lining portion press-fitted in the pressing step.

Description

TECHNICAL FOR LINING OF VALVE HAVING PROJECTION MEMBER AND VALVE HAVING LINER

The present invention relates to a lining method of a valve, and more particularly, to a lining method of a valve having a protrusion and a valve having the lining.

In general, valves are widely used in the chemical industry, and in particular, since they are connected to a tank for storing chemicals to control chemical entry and exit, corrosion resistance or chemical resistance is required for highly corrosive chemicals.

Therefore, in order to manufacture a valve used in the chemical industry in the past has been made of a metal such as zirconium, titanium excellent in corrosion resistance, but because such a metal is expensive, there is a problem that the manufacturing cost increases.

In order to solve this problem, valves are made of relatively inexpensive metal such as stainless steel, iron, etc., and ethylene tetrafluoroethlene (hereinafter referred to as 'ETFE'), which is a material having excellent corrosion resistance inside the valve, is manufactured. By forming the lining according to the rotational molding method using.), It was possible to obtain the effect of lowering the manufacturing cost while having excellent corrosion resistance characteristics.

A longitudinal cross-sectional view of the valve formed with the ETFE lining by the rotational molding method is shown in FIG.

Referring to Figure 2 describes the rotational molding method, the process (a) of injecting the ETFE powder (4) inside the valve (1) after sealing the cover 3 to the valve (1), and the injected ETFE powder (4 ) Is a process (b) of rotating molding while heating to an appropriate temperature in the oven so as to be evenly fused to the inner surface of the valve (1), this method is called pre-injection method.

On the other hand, after sealing the valve with a cover in the oven after the first heating it is possible to put the ETFE powder inside the valve at a constant temperature, and to be rotated again while heating in the oven, this is called a post-injection method.

By the above-described process, a valve 1 having an ETFE lining 2 as shown in FIG. 1 is manufactured.

However, although it is relatively easy to manufacture the ETFE lining 2 on the valve 1 having the structure as shown in FIGS. 1 and 2, it is difficult to manufacture the ETFE lining 110a of the valve having the protrusion 102 as shown in FIG. 3. This follows.

That is, after the powder 110 is introduced into the valve according to the conventional rotational molding method, the cover 120 is covered to cover the outside of the protrusion 102, and the above-mentioned rotational molding is performed. Increasingly less heat transfer, as shown in Figure 3, the lower portion of the outer portion of the protrusion 102 is formed with a thick lining, the upper portion of the outer portion of the protrusion 102 is formed thin to form a lining of uniform thickness There was a problem that can not be obtained, the lining of the required thickness.

On the other hand, in order to use a valve having a stem for opening and closing the protrusion of the valve, for example, a valve such as a tank flush valve, in the chemical industry, not only the valve body but also the stem in contact with the fluid have excellent corrosion resistance such as zirconium and titanium. Since it must be made of expensive metal, there was a problem that the manufacturing cost increases.

According to the present invention for solving the above problems, not only the inner surface of the valve having a protrusion, but also the upper surface and the outer surface of the protrusion, a portion of the upper surface of the flange portion is uniform, forming a lining of sufficient thickness excellent in corrosion resistance It is an object of the present invention to provide a lining method of a valve having a protrusion and a valve having a protrusion having a lining so as to increase chemical resistance and corrosion resistance without using metal.

The stem of the valve having a stem to open and close the protrusion is formed of a polytetrafluoroethlene (PTFE) material on the outer portion of the metal rod, thereby making the metal excellent in corrosion resistance. An object of the present invention is to provide a lining method of a valve having a protrusion capable of producing a stem having excellent corrosion resistance and chemical resistance, and a valve having a protrusion provided with the lining without fabrication.

A lining method of a valve having a protrusion according to the present invention for achieving the above object and a valve having a protrusion provided with a lining may include a tubular body portion, a flange portion formed at one end of the body portion, and the other end of the flange portion. A method of lining a valve having a tubular protrusion formed in communication with the body portion, comprising: (A) an inner surface of the valve, or an inner surface of the valve and an upper surface of at least a portion of the protrusion by a conventional rotational molding method; Rotational molding step lining; (B) a press-fit step of manufacturing a protrusion outer lining portion for lining the outer portion of the protrusion which is not lined by the rotational molding step and press-fits into the protrusion; (C) it provides a lining method of a valve having a protrusion, characterized in that it comprises a welding step of melting the boundary portion between the lined portion by the rotational molding step and the protrusion outer lining portion pressed in the pressing step.

In the above, (D) it is preferable to further include the step of machining the lining formed after the rotational molding step to trim the parts to be bordered with the protruding outer lining portion.

In the above, it is preferable that the protruding portion outer lining portion is manufactured to cover at least a portion of the protruding portion outer surface and the flange portion upper surface.

In the above, it is preferable that the protruding portion outer lining portion is manufactured to cover at least a portion of the protruding portion outer surface and the upper surface and the flange portion upper surface.

In the above, it is preferable that the protruding portion outer lining portion is formed separately from the mold having a shape corresponding to the protruding portion by a rotational molding method.

In the above, in the pressing step, it is preferable to perform a thermal indentation for heating and press-fitting the protruding portion outer lining portion manufactured to have an inner diameter smaller than the outer diameter of the protruding portion.

The method according to claim 1, further comprising a lining method of the stem for opening and closing the protrusion of the valve, wherein the lining method of the stem includes (E) a metal rod, the inner diameter of which is smaller than the outer diameter of the metal rod of polytetrafluoroethylene material Manufacturing a stem outer lining; (F) pressing the stem outer lining into the metal rod; (G) preferably further comprises the step of machining the outer lining to have a uniform thickness after indentation.

In the above, the flange portion is preferably composed of a first flange portion formed integrally on one end of the body portion and a second flange portion formed on one end of the protruding portion.

It is preferable that the valve with the protrusion provided with the lining for achieving the above object is provided according to the lining method of the valve with the protrusion.

According to the lining method of the valve provided with the protrusion of this invention as described above, and the valve provided with the protrusion provided with the lining, the uniformity of the protrusion of the valve provided with the protrusion is possible, and the lining of sufficient thickness is possible, It is easy to manufacture a valve having corrosion resistance and chemical resistance without producing a valve made of metal, there is an effect that the manufacturing cost is lowered.

Another effect is to increase the corrosion resistance and chemical resistance of the stem by means of a lining method of injecting the PTFE lining into the metal rod, such as stainless steel, the stem provided in the valve having a protrusion, and furthermore, because the stem is not made of expensive metal Has the effect of lowering.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, this is only to describe in detail enough to be able to easily carry out the invention by those skilled in the art, which does not mean that the technical spirit and scope of the present invention is limited.

4 is an explanatory view illustrating a lining fabrication process of an inner surface of a valve having a protrusion and an upper surface of a protrusion according to an embodiment of the present invention, and FIG. 5 is a protrusion of the valve having a protrusion according to an embodiment of the present invention. It is explanatory drawing about the manufacturing process of an outer lining part.

When described in detail with reference to Figures 4 and 5,

The valve having a protrusion according to the present invention is formed in the tubular body portion 100, the flange portion 101 formed on one end of the body portion 100, the other end of the flange portion 101 and the body portion 100 and It has a tubular protrusion 102 in communication with it.

The lining of the inner surface of the valve having the protrusion 102 or the inner surface of the valve and the upper surface of the protrusion 102 can be produced by a conventional rotational molding method, and the lining of the inner surface of the valve and the upper surface of the protrusion 102 is provided. Explain the process of making

First, a predetermined amount of powdered ETFE powder 110 is introduced into the valve, and the cover 130 is manufactured and covered to cover the protrusion 102 of the valve (FIG. 4A).

At this time, the thickness of the ETFE lining (110b) is formed according to the amount of the ETFE powder 110 is input, which can of course be changed by those skilled in the art as necessary.

The cover 130 is in close contact with the outside of the protrusion 102, as shown in Figure 4, and is manufactured so as not to cover the upper surface of the protrusion 102, in particular the cover so that the ETFE powder 110 does not leak to the outside ( It is preferable to seal the portion where 130 and the protrusion 102 contact.

Next, the cover 130 is covered with a sealed valve is placed in the oven, and heated to a predetermined temperature with a multi-directional rotation (step (b) of Figure 4).

When a predetermined time elapses as the valve is heated together with the multi-directional rotation, the ETFE powder 110 is uniformly fused to the inner surface of the valve and the upper surface of the protrusion 102 to form an ETFE lining 110b having a uniform thickness. (C) process of Figure 4).

In addition, as shown in FIG. 4C, the protrusion outer lining part 110c is provided to be press-fitted by the mold 200, as will be described in detail later.

That is, the manufacturing process will be described in detail with reference to FIG. 5 to manufacture the protrusion outer lining.

First, the mold 200 corresponding to the shape of the protrusion 102 is prepared in advance, a predetermined amount of ETFE powder 110 is introduced into the produced mold 200, and the protrusion outer lining 110c of the mold 200 is formed. Cover and seal the mold cover 140 provided to cover the part to be manufactured (FIG. 5 (a) process).

Subsequently, the sealed mold 200 is placed in a closed oven for rotational molding, and heated to a predetermined temperature with multidirectional rotation (process of FIG. 5B).

That is, the injected ETFE powder 110 is uniformly fused to the mold 200 and the inner surface of the mold cover 140 after a predetermined time elapses as the mold 200 is heated to a predetermined temperature with multi-directional rotation, thereby ETFE lining 110c. ) Is formed (process (c) of FIG. 5).

The formed ETFE lining 110c is separated from the mold 200 and cut to have a shape and size as shown in FIG. 4C to produce the protrusion outer lining 110c.

At this time, the inner diameter of the protruding portion outer lining portion (110c) to be produced is smaller than the outer diameter of the protruding portion 102 is firmly coupled by the indentation process to be described later, the outer surface of the protrusion 102 and the upper portion of the flange portion 101 It is preferable to cover.

In addition, although the protrusion outer lining part 110c was manufactured by the rotomolding method with the mold 200 corresponding to the shape of the protrusion 102, the protrusion outer side by press molding with another method, for example, male and female molds. It is also possible to manufacture the lining portion 110c, this design change is obvious to those skilled in the art.

As shown in (c) of FIG. 4, the manufactured protrusion outer lining part 110c has a corresponding shape of the protrusion part 102, that is, an outer side surface of the protrusion part 102 and a part of an upper surface of the flange part 101. Press to cover.

At this time, the indentation process is because the inner diameter of the protrusion outer lining 110c is smaller than the outer diameter of the protrusion 102, when the protrusion outer lining 110c is heated and relaxed to be inserted to the outside of the protrusion 102, the inserted protrusion When the outer lining part 110c is elapsed after a predetermined time, the outer lining part 110c is contracted to return to its original shape, thereby performing a thermal press fitting process fixedly coupled to the protrusion part 102.

The protrusion outer lining 110c fixed by the thermal press is formed of an ETFE material so as to connect the boundary between the inner surface of the valve formed in the rotational molding process of FIG. 4 and the ETFE lining 110b of the upper surface of the protrusion 102. Weld welding is performed by melting the pre-fabricated ETFE rod.

At this time, it is preferable to machine the parts to be bordered with the protrusion outer lining 110c of the ETFE lining 110b of the valve inner surface and the protrusion 102 upper surface before the joint welding.

After the joint welding, the ETFE linings 110b and 110c protruding from the upper surface, the outer surface of the protrusion 102 and the upper surface of the flange portion 101 are machined to have a constant thickness so as to correspond to the shape of the protrusion 102. This is preferred.

6 is an explanatory view of the inner surface lining manufacturing process of the valve having a protrusion according to another embodiment of the present invention.

Referring to Figure 6 in detail,

According to the lining method of the valve having a protrusion according to another embodiment, only the inner surface of the valve is manufactured by a rotation molding method according to a method of covering the cover 150, and the protrusion outer lining part 110e is a part of the upper surface of the flange portion 101 and The outer surface of the protruding portion 102, the upper portion of the protrusion 102 is further produced by the mold.

That is, as shown in FIG. 6 (a) to produce a rotational molding method on the inner surface of the valve, a predetermined amount of ETFE powder 110 is introduced into the valve and then the upper and outer surfaces of the protrusions 102. Cover the cover 150 is made to be in close contact with the seal (Fig. 6 (a) process).

Subsequently, the ETFE powder 110 injected by heating the valve sealed according to the rotational molding method at a predetermined temperature with the multi-directional rotation is evenly fused along the inner surface of the valve to form an ETFE lining 110d having a uniform thickness ( (B), (c) process of Figure 6).

As shown in FIG. 6C, the protrusion outer lining 110e including the protrusion 102 upper surface, the protrusion 102 outer surface, and a portion of the upper surface of the flange 101 is manufactured in a corresponding shape in advance. The mold is manufactured by the above-described rotational molding method, and press-fitted and fixed by thermal press.

In this case, the ETFE rod is melted at the boundary between the ETFE lining 110d of the valve inner surface and the protrusion outer lining 110e, and welded, and machined.

On the other hand, the above-mentioned indentation process is preferably carried out by thermal indentation, any other indentation method may be performed, which can be changed by anyone skilled in the art.

In the foregoing, the lining method of a valve having a general protrusion has been described, and a lining method of a tank flush valve used in the chemical industry will be described below by applying the lining method of the valve having such a protrusion.

FIG. 7 is a partial longitudinal cross-sectional view of a tank flush valve with a lining according to a lining method of a valve having a protrusion according to an embodiment of the present invention, and FIG. 8 is an explanatory view of a lining manufacturing process of the stem of FIG. 7. .

Referring to Figure 7 in detail,

The tank flush valve is generally divided into a body 10, a stem 20, a handle 30, a cap 40, and a stem 20 coupled with the handle 30 according to left and right rotations of the handle 30. This vertical movement is performed, and the flow path 11 is opened and closed by the vertical movement of the stem 20.

In detail, a first flange portion 13 is formed at one end of the body 10, and a second flange portion 41 coupled to the first flange portion 13 is formed at one end of the cap 40. .

The flow path 11 is formed as both ends of the body 10 are opened, and one side of the body 10 is formed to be inclined to the outside of the valve about 45 degrees based on the stem 20 inserted into the body 10. The branch pipe 16 is provided, and as the third flange portion 12 is formed at the end of the branch pipe 16, a flow path 11 is further formed along the inside of the branch pipe 16.

At this time, the fourth flange portion 14 is further formed on the other end of both ends of the body 10, the handle 30 and the stem 20 is inserted and connected, the inner diameter of the stem 20 to the size that can be inserted In order to be provided, the flow path 11 formed at the other end of the body 10 is closed by tightly fixing the V-packing 70 along the outer circumferential surface of the inserted stem 20.

That is, only the flow path 11 of one end of the body 10 and the end of the branch pipe 16 to which the cap 40 is coupled is opened and closed according to the vertical movement of the stem 20.

Thus, as shown in FIG. 7 to have corrosion resistance, the ETFE lining 17 having a predetermined thickness is formed in the flow path 11 by applying the ETFE lining method of the present invention.

At this time, the inner surface of the body 10 and the inner surface of the cap 40 or the inner surface of the body 10, the inner surface of the cap 40 and the upper surface of the cap 40 lining using the above-described rotational molding method Although it is possible, the protrusion part 42 of the cap 40, that is, the outer surface of the protrusion part 42 and the upper surface of the second flange part 41 is preferably manufactured by a mold to apply a press-fit method.

On the other hand, as the tank flush valve opens and closes the flow path 11 by the up and down movement of the stem 20, the metal stem 20 also needs to be formed because the lining is in contact with the fluid. It will be described later in detail with reference.

First, a metal rod made of stainless steel is prepared to have an outer diameter that can be inserted into the tank flush valve, but one end of the metal rod is manufactured to have an outer diameter larger than the other end, so that insertion of the stem outer lining portion 23a to be described later is performed. To facilitate (step (a) of Figure 8).

The stem outer lining portion 23a is made of PTFE material, and has a tubular shape having an inner circumferential surface to be inserted into the metal rod, and the other end is blocked (produced in FIG. 8A).

At this time, the inner diameter of the stem outer lining portion (23a) is preferably provided to be smaller than the smaller outer diameter of the two outer diameter of the metal rod, it is preferable to be fixed by indentation.

The manufactured stem outer lining part 23a is fixed to the metal rod by press-fitting (process of FIG. 8 (b)), and the machined trimmed stem outer lining part 23a is machined to a predetermined thickness to trim the PTFE lining 23. To complete (process (c) of Figure 8).

In the reference numerals shown in FIG. 7, reference numeral 15 is a coupling bolt 15, 21 is a stopper 21, and 22 and 31 are fixed bolts 22 and a fixed nut 31, and 32 is an axis. (32), 43 is hollow (43), 50 is yoke (50), 51 is yoke sleeve (51), 52 is yoke bolt (52), 53 is yoke nut (53), 60 is gasket (60), 80 is a disk 80, 81 is a disk joint 81, the structure and function of the codes are obvious to those skilled in the art will be omitted description that does not conform to the present invention.

1 is a longitudinal sectional view of a valve formed with a lining by a rotational molding method according to the prior art.

2 is an explanatory diagram of a manufacturing process of FIG.

Figure 3 is a longitudinal sectional view of the valve having a protrusion formed with a lining by the rotational molding method according to the prior art.

Figure 4 is an explanatory view of the lining manufacturing process of the inner surface of the valve having a protrusion according to an embodiment of the present invention and the upper surface of the protrusion.

5 is an explanatory view of a process of manufacturing a protrusion outer lining of a valve having a protrusion according to an exemplary embodiment of the present invention.

Figure 6 is an explanatory view of the inner surface lining manufacturing process of the valve having a protrusion according to another embodiment of the present invention.

Figure 7 is a partial longitudinal cross-sectional view of the tank flush valve with a lining in accordance with the lining method of the valve having a projection according to an embodiment of the present invention.

8 is an explanatory view of the lining manufacturing process of the stem of FIG.

<Description of reference numerals for the main parts of the drawings>

10: body 11: euro

12: third flange portion 13: the first flange portion

14: fourth flange portion 16: branch pipe

17: ETFE lining 20: stem

23: PTFE lining 23a: stem outer lining

30: handle 40: cap

41: second flange portion 42, 102: protrusion

70: V-packing 100: body

101: flange 110: ETFE powder

110a, 110b, 110d: ETFE lining

110c, 110e: protrusion outer lining

120, 130, 150: Cover 140: Frame Cover

200: template

Claims (9)

A method of lining a valve having a tubular body portion, a flange portion formed at one end of the body portion, a tubular protrusion formed at the other end of the flange portion and in communication with the body portion, (A) a rotational molding step of lining the inner surface of the valve, or the inner surface of the valve and the upper surface of at least some of the protrusions by a conventional rotational molding method; (B) a press-fit step of manufacturing a protrusion outer lining portion for lining the outer portion of the protrusion which is not lined by the rotational molding step and press-fits into the protrusion; And (C) a lining method of a valve having a protrusion, comprising a welding step of melting a boundary between a portion lined by the rotomolding step and a protrusion outer lining part press-fitted in the pressing step. The method of claim 1, And (D) machining the lining formed after the rotomolding step to machine the outer lining and the part to be bordered with each other so as to match each other. According to claim 1, wherein the protrusion outer lining portion A method of lining a valve with a protrusion, characterized in that it is manufactured to cover at least a portion of the protrusion outer surface and the flange upper surface. According to claim 1, wherein the protrusion outer lining portion A method of lining a valve having a protrusion, characterized in that it is manufactured to cover at least a portion of the protrusion outer surface and the upper surface and the flange upper surface. According to claim 1, wherein the protrusion outer lining portion Method for lining a valve having a protrusion, characterized in that formed by forming by rotating molding method from the mold of the shape corresponding to the protrusion and separated. The method of claim 1, Method of lining a valve having a protrusion, characterized in that for performing the thermal press-in to heat press-in the protrusion outer lining portion manufactured to be smaller than the outer diameter of the protrusion in the pressing step. The method of claim 1, Further comprising a lining method of the stem for opening and closing the protrusion of the valve, The method of lining the stem includes (E) manufacturing a stem outer lining part of poly tetrafluoroethylene material having a metal rod and having an inner diameter smaller than that of the metal rod; (F) pressing the stem outer lining into the metal rod; And And (G) machining the outer lining to have a uniform thickness after indentation. The method of claim 1, wherein the flange portion And a first flange part integrally formed at one end of the body part and a second flange part formed at one end of the protrusion part. A valve having a projection with a lining formed according to the method of claim 1.

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