KR20230061657A - A high-pressure needle valve with ion nitriding stem - Google Patents

Abstract

The present invention relates to a high-pressure needle valve, and relates to a high-pressure needle valve having an ionitridized stem made to reduce manufacturing cost and enhance durability by using a screen ionitration treatment method.
The high-pressure needle valve having an ionitridized stem of the present invention is a high-pressure needle valve that regulates fluid or gas using a vertically moving stem, characterized in that the sealing portion of the stem is ionitridized within 5 hours to be
The high-pressure needle valve includes a stem installed in a stem installation portion of a valve body having an outlet port portion, an inlet port portion, and a stem installation portion, and moving up and down according to manipulation of a stem handle; After being inserted through the inlet port, it includes a replacement type metal seal configured to be fixed with a metal seal connector having an inlet port, and a connection screw for separation for separation during replacement is provided at the lower side of the passage hole formed in the replacement type metal seal. The stem and the replacement type metal seal use metal of the same material, but only the stem is ionized so that the hardness of the stem is higher than that of the replacement type metal seal by 140HV or more, so that the replacement type metal is more replaceable than the stem. It caused the seal to be damaged.

Description

A high-pressure needle valve with ion nitriding stem}

The present invention relates to a high-pressure needle valve, and relates to a high-pressure needle valve having an ionitridized stem made to reduce manufacturing cost and enhance durability by using a screen ionitration treatment method.

In general, a valve is a device for controlling the flow rate, flow rate, pressure, etc. of a fluid or gas (gas) flowing through a pipe, and is classified into various types according to requirements such as usage and pressure.

A simple look at the types of these valves includes a stop valve to safely block the flow of fluid, a slew valve to block a flow path with high pressure, a butterfly valve to control the opening of a pipeline, and a reverse flow by allowing fluid to flow in only one direction. An escape valve that automatically operates when the hydraulic pressure in the pipe exceeds the specified level to allow the fluid to flow out or return to its original state. Cock valves, etc.

The present invention relates to a high-pressure needle valve for controlling the flow of a high-pressure fluid or gas (gas).

In general, in a high-pressure needle valve, a sealing part for controlling the flow of a high-pressure fluid or gas (gas) is made of metal-to-metal contact.

The applicant of the present invention has registered Patent No. 2080603, a replacement seat having a guide for stem and a valve including the same, in order to improve problems caused by vibration of the end of the operating system for control in a high pressure needle valve due to high pressure. , Patent Registration No. 2225407 provided a high-pressure valve with flow control and opening/closing functions.

However, despite providing such a technology, wear and damage due to high-pressure fluid and high-pressure gas for control occur between the stem and the replacement sheet (replacement-type metal seal). This is a problem in that the unit price of the product is increased and the maintenance cost due to replacement is increased.

As shown in FIG. 6, the replacement seat (replacement type metal seal) 30, which is replaced due to damage, is inserted through the inlet port 12 of the valve body 10 and partially inserted on the passage 14, and inserted. The replacement seat (replacement type metal seal) 30 is fixed with a metal seal connector 16 screwed with a screw portion formed on the inlet port portion 12 of the valve body 10. That is, the replacement seat (replacement type metal seal) 30 is pressurized and fixed by the metal seal connector 16, and the passage 14 of the valve body 10 depends on long-term use and the type of intermittent (to be controlled) fluid. It is not well separated from the phase, which can cause a lot of inconvenience during replacement.

(KR) Registered Patent No. 10-2080603 (KR) Registered Patent No. 10-2225407

An object of the present invention is to solve the problems of the prior art by enabling metal of low hardness to be used for a metal stem and a replacement sheet (replacement type metal seal).

That is, in the present invention, the stem and the replacement sheet (replacement type metal seal) can be made of a metal with low hardness, but surface treatment using ion nitration is performed to improve the hardness, thereby solving the problems of the prior art.

In addition, when replacing the replacement type metal seal, it is intended to be easily separated from the passage of the valve body so that replacement and repair can be easily performed.

In order to achieve the above object, the present invention, a high-pressure needle valve having an ionitridized stem, is a high-pressure needle valve that uses a vertically moving stem to regulate fluid or gas, and the sealing surface and outer surface of the stem are ionitridized It is characterized by

The high-pressure needle valve includes a stem installed in a stem installation portion of a valve body having an outlet port portion, an inlet port portion, and a stem installation portion, and moving up and down according to manipulation of a stem handle; After being inserted through the inlet port, a replacement type metal seal configured to be fixed with a metal seal connector having an inlet port is included, and the lower side of the passage hole formed in the replacement type metal seal is for separation to facilitate removal after fastening. A connection screw portion is formed, and the stem and the replacement type metal seal use the same metal material, but only the stem is ionitized so that the hardness of the stem is higher than that of the replacement type metal seal.

The stem and the replacement type metal seal are made of any one material among STS 316CW, STS 630, and STR 660, and only the stem is surface treated with a screen ion nitriding method for 3 to 5 hours.

Alternatively, the stem and the replacement type metal seal use STS 316CW material, and the surface treatment is performed by the screen ion nitriding method so that the hardness (HV) of the stem 20 is 600 to 700, and the hardness between the stem and the metal seal Make sure the car is over 140HV.

The surface of the stem is coated with one of graphene, TiN, TiCN, and DLC (diamond-like carbon) to increase wear resistance and reduce friction with respect to the solid seal.

The high-pressure needle valve having an ionitridized stem according to the present invention made as described above can prevent an increase in manufacturing cost and product cost caused by using a metal of high hardness, while being manufactured by using a metal of low hardness. It has this easy advantage.

That is, in manufacturing the stem and replacement type metal seal, heat treated STS 630 and STR 660 materials with high hardness are not used, and STS 316CW or unheat treated STS 630 having a hardness lower than heat treated STS 630 and STR 660 is used. By using it, the cost of the metal material is low and the manufacturing of the product is easy, thereby having the advantage of lowering the unit price of the product.

In particular, it is most preferable to use STS 316CW, and has the advantage of being able to manufacture the high-pressure needle valve at a low cost due to its low cost of material and ease of manufacture compared to STS 630.

In addition, the replacement type metal seal can be easily separated from the passage of the valve body by using the connection screw for separation formed on the lower side of the hole for the flow path of the replacement type metal seal, so that it can be easily replaced when the replacement type metal seal is damaged. .

1 is a schematic diagram of a high-pressure needle valve with an ionitridized stem illustrating one embodiment of the present invention.
Figure 2 is a schematic cross-sectional view of a high pressure needle valve having an ionitridized stem showing one embodiment of the present invention.
3 is a schematic cross-sectional view of a high-pressure needle valve having an ionitized stem showing an embodiment of the present invention.
4 is a schematic cross-sectional view of a stem and a replacement type metal seal of a high-pressure needle valve having an ionitridized stem showing an embodiment of the present invention.
5 is a hardness graph of metals subjected to screen ionitration (plasma nitration) treatment, which is an embodiment of the present invention.
6 is a schematic view showing that a replacement type metal seal, which is a major part of a prior art high pressure needle valve, is fixed with a metal seal connector.

Terms or words used in this specification and claims should not be construed as being limited to a common or dictionary meaning, and the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention. It is only and does not represent all of the technical spirit of the present invention, it should be understood that there may be various equivalents and modifications that can replace them at the time of this application.

The present invention relates to a high-pressure needle valve made to control a fluid or gas (gas) using a stem, and more particularly, to reduce manufacturing cost by improving hardness by ionitrating the surface of the stem. It relates to a high-pressure needle valve having a stem.

Screen ion nitriding uses glow discharge generated by applying a high voltage of the cathode to the perforated plate in the chamber, not the treated material. is known to be For this reason, the surface roughness of the treated material after nitriding treatment is excellent, and it is characterized by being able to process products with complex shapes.

Ionitriding raises wear resistance, corrosion resistance, fatigue strength and improves surface hardness to an extremely high level. Since it is processed in a low-temperature vacuum state, there is an advantage that almost no deformation occurs and post-processing can be omitted.

Experiment method

Material: STS 316CW, STS 630, heat treated STS 630 (hereinafter referred to as 'STS 630T'), STR 660

Specimen: Disk type (diameter (Ф) 31.9 (㎜), thickness (T) 6㎜)

Hardness measurement method: 5 times measured with a micro Vickers hardness tester

Surface treatment method: screen ionitration (plasma nitrification)

Prepared specimens made of STS 316CW, STS 630, STS 630T, and STR 660 are subjected to ionization at intervals of 0 hours (hr), 4 hours (hr), 8 hours (hr), and 12 hours (hr).

The specimens surface-treated by the ion nitriding method at each of the above times were measured 5 times using a micro Vickers hardness tester, and the results are shown in the table below and FIG. 5.

Standard(0hr) 4hr 8hr 12hr STR 660 HV 414 HV770 HV 1015 HV 1021 STS 316CW HV 308 HV663 HV827 HV 947 STS630 HV 340 HV905 HV890 HV 924 STS 630T HV430 HV896 HV 1017 HV 1104

As a result of surface treatment of the specimens by the secret ion nitriding method, the hardness (HV) of all specimens increased as shown in the table above.

In general, the stem used for high-pressure needle valves uses STS 630T material obtained by heat treatment of STS 630, a material with high hardness, to prevent damage to the stem due to high pressure.

The hardness (HV) of heat-treated STS 630T has a high hardness of about 430, and when manufacturing a stem by processing such a high hardness material, it is difficult to manufacture due to the high hardness, and the unit price of the material is high. there is.

In the present invention, it is possible to use STS 316CW or STS 630, which has a relatively lower hardness than STS 630T and can be inexpensive, as a stem used in a high pressure needle valve.

As shown in the above experimental results, when the surface treatment of STS 316CW and STS 630 was performed for 4 hours (hr) by the ionitriding method, both STS 316CW and STS 630 showed higher hardness (HV) than 430 of STS 630T without ionitration.

Furthermore, in the case of the material STS 316CW, the hardness (HV) was about 663 when the surface was treated by the ionitriding method for 4 hours (hr), which indicates that it can be used as a very excellent material for the stem used in high pressure needle valves. Proven.

In summary, considering economic feasibility, the stem material is STS 316CW or STS 630, and the screen ionitriding time is within 5 hours (hr) as a result of reviewing various comprehensive factors such as hardness, production time and cost. It is desirable to do

Preferably, the material of the stem is STS 316CW, and the screen ionization time is 3 to 5 hours (hr), but the difference in hardness between the replacement type metal seals is higher than 140HV for the stem.

A stem made of such ionitridized STS 316CW is used for high-pressure needle valves as shown in FIGS. 1 to 4.

Referring to Figures 1 to 4,

The high-pressure needle valve 1 shown in FIGS. 1 to 4 can control high-pressure fluid or gas (gas) by moving the stem up and down. Looking at its configuration, the outlet port 11 and the inlet port A valve body 10 having a part 12 and a stem installation part 13, a stem 20 installed on the stem installation part 13 and moving up and down by the operation of the stem handle 21, and the inlet After being inserted through the port portion 12, it includes a replacement type metal seal 30 fixed with a metal seal connector 16 having an inlet port 16a.

The outlet port portion 11, the inlet port portion 12, and the stem installation portion 13 provided in the valve body 10 are formed to communicate with each other through a passage 14 formed to form a flow path, On the lower side of the drawing, an inlet port 12 for connection with an inlet means is formed so that fluid or gas (gas) can flow in, and on the right side, the fluid or gas (gas) introduced into the inlet port 12 is formed. An outlet port portion 11 for connection with the discharge means is formed so that it can be discharged, and the stem 20 for controlling the inflow fluid or gas (gas) is installed on the upper side opposite to the inlet port portion 12. A stem installation portion 13 is formed.

A metal seal connector 16 having an inlet port 16a is installed at an end portion of the inlet port 12 that is coupled by screwing and fixing the replacement type metal seal 30 .

The stem installation part 13 includes a sealing pressing member 18 for pressing and fixing a solid seal installed for airtightness between the stem 20 and the passage 14 in the valve body 10, and the stem ( 20) is installed, and a stem gland 17 configured to move up and down according to the rotation direction of the stem 20 is installed.

A threaded portion is formed on the inner surface of the stem ground 17 to move the stem 20 up and down, and the anti-loosening device 15 and the outer surface come into contact to prevent loosening.

The stem 20 has a stem handle 21 for vertical movement installed on the upper side, and a stem guide 22 installed on the upper side.

The stem guide 22 is pressurized and fixed by a fixing screw installed on the top of the stem 20, and a threaded portion for movement coupled with a threaded portion formed on the inner surface of the stem gland 17 is formed on the lower outer circumferential surface.

The replacement type metal seal 30 is installed on the passage 14 formed to form a flow path in the valve body 10, and is inserted into the inlet port 12 and screwed to the inlet port 12 by screwing. It is fixed with a metal seal connector 16 to be coupled.

The replacement type metal seal 30 includes a passage hole 31 penetrating the inside for forming a passage, a sealing part 32 formed in the middle of the passage hole 31, and the sealing part 32 A stem guide part 33 formed on the upper part, a fixing expansion part 34 formed on the lower part so that the outer peripheral surface protrudes so that it can be fixed with the metal seal connector 16, and formed on the lower side of the passage hole 31 It includes a connecting screw portion 35 for separation.

When the replacement type metal seal 30 is damaged due to damage to the replacement type metal seal 30, the connection screw part 35 for separation is combined with a tool for separation and discharge in a screwing manner so that separation can be facilitated.

That is, the connection screw portion 35 for separation is configured to be separated by using a separate separation and discharge tool when replacing due to damage to the replacement type metal seal 30, and the metal seal in the inlet port portion 12 After separating the connector 16, insert a tool for separation and discharge, fasten the thread formed at the end of the tool for separation and discharge to the connection screw for separation 35, and then discharge the replacement type metal seal 30 to the outside. allow it to be done

Due to this, the replacement type metal seal 30 is pressurized and fixed by the metal seal connector 16, and will not be separated from the passage 14 of the valve body 10 depending on the type of fluid used for a long time and intermittent (to be controlled). Discomfort caused by possible phenomena can be resolved.

The stem 20 and the replacement type metal seal 30 of the high-pressure needle valve 1 made in this way use the same metal material.

The stem 20 and the replacement type metal seal 30 use STS 316CW or STS 630, which is a metal of the same material, preferably STS 316CW.

By ionizing only the stem 20, the hardness of the stem 20 is 140 HV or more than the hardness of the replacement type metal seal 30, thereby minimizing damage to the stem 20.

In addition, on the outer circumferential surface of the stem 20, a coating layer using a coating method such as graphene, TiC, TiCN, DLC (diamond-like carbon) is applied to increase abrasion resistance against the solid seal and reduce the friction coefficient. can also be added.

1: High pressure needle valve
10: valve body
20 : stem
30: replacement type metal seal

Claims (5)

In the high-pressure needle valve that regulates fluid or gas using a stem that moves up and down,
A high-pressure needle valve having an ionitized stem, characterized in that the surface treatment of the sealing portion of the stem using screen ionitration. The method of claim 1, wherein the high pressure needle valve,
It is installed in the stem installation part 13 of the valve body 10 equipped with the outlet port part 11, the inlet port part 12, and the stem installation part 13, and moves up and down according to the operation of the stem handle 21. The stem 20 and; After being inserted through the inlet port portion 12, it includes a replacement type metal seal 30 configured to be fixed with a metal seal connector 16 having an inlet port 16a,
A connection screw portion 35 for separation is formed at the lower side of the passage hole 31 formed in the replacement type metal seal 30 for separation during replacement,
The stem 20 and the replacement type metal seal 30 use metal of the same material, but only the stem 20 is ionitized so that the hardness of the stem 20 is 140 HV or more than the hardness of the replacement type metal seal 30. High pressure needle valve with ionitridized stem characterized by high. According to claim 2,
The stem 20 and the replacement type metal seal 30 are made of any one of STS 316CW, STS 630, and STR 660, and only the stem 20 is surface treated with a screen ion nitriding method for 3 to 5 hours. High-pressure needle valve with an ionitridized stem as a feature. According to claim 3,
The stem 20 and the replacement type metal seal 30 use STS 316CW material, and the hardness (HV) of the stem 20 is ionitridized by ionitriding to be 600 to 700. High-pressure needle valve with stem. According to any one of claims 2 to 4,
The surface of the stem 20 is an ionitized stem characterized in that it is coated with any one of graphene, TiN, TiCN, and DLC (diamond-like carbon) for enhancing surface hardness and reducing frictional force with the upper solid seal High-pressure needle valve having a.

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