KR20180098720A - Valve stem for ultra high pressure valve - Google Patents

Abstract

Disclosed is a valve stem for an ultra high pressure valve. The valve stem includes: a valve body having an inlet formed at one side, an outlet formed at a position different from the position of the inlet, and a control hole formed by interposing a valve seat between the inlet and the outlet; and a control means having a valve stem, which is located in a stem hole formed above the control hole and has a stem body and a stem head to control a flow of a fluid by opening and closing the control hole while approaching and separated from the valve seat, a packing interposed between the outer face of the valve stem and the stem hole to maintain airtightness, and a driving shaft maintained on the valve body by a retaining nut and a gland to rotate the valve stem forwardly and backwardly, wherein the control means selects the flow of the fluid. The valve stem further includes a blocking means for blocking causes which damage and abrade a backup ring, the packing and the valve stem by blocking ultra high pressure at a boundary position between the stem body and the stem head, dispersing pressure and inducing the pressure in the direction of the stem head, and which hinder airtightness due to a flow of the fluid.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve stem for ultra-

[0001] The present invention relates to a valve stem for an ultra-high-pressure valve, and more particularly, to a valve stem for an ultra-high-pressure valve, which is structurally improved to prevent damage and deformation of related parts located above the valve stem, .

Generally, valves are used to control the flow, such as the supply of fluids such as air, gas, liquid and the like. Generally, valves used for industrial use have a pressure of less than 100 bar.

However, a line for supplying hydrogen to the storage tank, a supply line for supplying hydrogen to the storage tank, for example, a filling facility for filling hydrogen with a hydrogen car, a filling line, a filling line, etc., And an ultra high pressure valve is used to easily control the ultra high pressure fluid.

Many ultra high-pressure valves have been developed and used in the past. Such ultra-high-pressure valves include open-close type valves for interrupting and releasing fluid flow and flow control for freely controlling the amount of fluid Valves.

The valve stem is connected to an opening / closing means provided above the control hole. The valve stem is connected to the control hole. The control hole is formed at the intermediate position between the inlet port and the discharge port. So that the flow of the fluid can be selected.

The technical structure of the ultra-high pressure valve will be briefly described with reference to FIG.

A typical ultra high pressure valve 1 to which the prior art is applied is provided with an inlet 3 formed at one side of a hexahedron shaped valve body 2 made of a metal and supplied with a fluid, And an outlet 4 for discharging the introduced fluid is formed at another position.

A control hole 6 having a valve seat 5 is formed between the inlet 3 and the outlet 4 so that the fluid can flow from the inlet to the outlet and a stem hole And a valve stem 10 connected to the opening / closing means 8 such as a handle, a lever or an actuator provided above the valve body 2 so as to move upward and downward in the direction of the control hole 6. [

The valve stem 10 includes a bar type stem body 11 connected to the opening and closing means 8 and having a long length and a valve body 11 having a diameter smaller than that of the stem body 11 at the lower end of the stem body 11 , And a stem head (13) having a tip (12) in bullet shape so as to be connectable with the valve seat (5).

(Document 1) Patent Application No. 10 - 2012 - 0043231 (Document 2) Patent No. 10-1267328-0000 (Document 3) Patent No. 10-1667593-0000

The valve stem to which the conventional technique is applied functions not only to block or open the flow of the fluid while connecting or separating the valve stem with the valve seat, but also to control the amount of fluid flowing by adjusting the connection interval with the valve seat .

In the process of controlling the flow and amount of the fluid, there is no serious problem in the process of moving to the discharge port through the valve seat through the inlet port in the case of the general pressure fluid. However, in the case of the ultra- A significant pressure is delivered to the valve stem as well as to the upper portion of the valve stem.

That is, when the ultra high pressure is transmitted to the backup ring for maintaining the airtight packing or packing while maintaining the valve stem, the packing is pressed downward by the packing gland. However, in the closed state, The phenomenon that the ultrahigh pressure is instantaneously transmitted at the moment of opening is repeated.

When the ultrahigh pressure is instantaneously transferred to the packing located at the lowermost position through the backup ring, the backup ring and the packing are temporarily moved up to move finely. In this process, the fluid penetrates through the gap where the backup ring and the packing are generated If this is repeated continuously, the packing can not perform its function and eventually causes the fluid to leak above the valve stem.

In addition, when ultra-high pressure is momentarily transferred to the backup ring and the packing, damage to the backup ring and packing is caused by the movement of the packing up ring and the packing, and the inner wall surface of the stem hole and the surface of the valve stem are damaged. Such damage will cause fluid leakage to be accelerated.

When the high pressure is momentarily transmitted to the valve stem, the valve stem itself does not maintain a stable state and flows. When this phenomenon occurs, it is difficult to accurately and precisely control the flow, It is impossible to properly control it.

As described above, since the ultra high pressure adversely affects the valve stem and the components associated with the valve stem, various problems such as an adverse effect on the quality and durability of the ultra high pressure valve occur.

According to an aspect of the present invention, there is provided a valve body comprising: an inlet formed on a side surface thereof; an outlet formed in a position different from the inlet; and a valve body having a control hole formed between the inlet and the outlet, Wow;

A valve stem disposed in the stem hole formed above the control hole and configured to open and close the control hole while being connected to and detached from the valve seat to control the flow of the fluid, the valve stem having a stem body and a stem head; And a control means for selecting a flow of the fluid including an operating shaft which is held in the valve body by the intermittent nut and the gland to rotate and reverse the valve stem, ;

A stopping means for blocking the cause of damaging and abrading the backup ring, the packing and the valve stem, and the airtightness due to the flow by guiding the pressure to the stem head while dispersing the pressure while blocking the super high pressure at the boundary position between the stem body and the stem head More;

It can ensure smooth operation by excluding abrasion, damage and flow phenomenon of valve stem, backup ring, and packing, while satisfying the quality and durability of ultra high pressure valve and achieving the goal of being able to have an advantage of external competitiveness.

The present invention relates to a backup ring, which is located at the upper part of a valve stem, while dispersing a pressure of a fluid flowing through a stem head constituting a valve stem, and a backup ring, a packing and a valve It is possible to prevent damage and deformation of the stem.

By minimizing the influence of ultrahigh pressure due to fluid distribution, it is possible to prevent damage, deformation and flow of the backup ring, packing, valve stem, and stem hole to ensure smooth operation while eliminating leakage of fluid. It is possible to improve durability and to enhance external competitiveness.

1 is a schematic cross-sectional view showing an ultra-high pressure valve to which a valve stem according to the present invention is applied.
2 is a perspective view illustrating an example of a valve stem for an ultra high-pressure valve to which the technique of the present invention is applied.
3 is a cross-sectional view illustrating an important part of a valve stem for an ultra-high pressure valve to which the technique of the present invention is applied.
4 is a view showing another example of a valve stem for an ultra high-pressure valve to which the technique of the present invention is applied.
5 is a block diagram showing an ultra high pressure valve to which a valve stem of the prior art is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a perspective view illustrating a valve stem for an ultra-high pressure valve to which the technique of the present invention is applied. FIG. 3 is a cross-sectional view of a valve stem according to an embodiment of the present invention. FIG. 4 is a schematic view showing another example of a valve stem for an ultra high-pressure valve to which the technique of the present invention is applied. FIG.

A conventional ultra high pressure valve 100 is provided with a hexahedron shaped valve body 102 having a fixing hole 101. An inlet port for connecting a pipe for receiving fluid to a side surface of the valve body 102 And an outlet 104 is formed in a side surface of the valve body 102 at a position opposite to the inlet 103 or at a position different from the inlet 103. [

A control hole 106 is formed through the valve seat 105 so that the fluid can communicate with the inlet hole 103 and the outlet hole 104. A control hole 106 is formed above the control hole 106, And a control means 110 for selecting the flow of the fluid.

The control means 110 includes a valve stem 120 positioned in the stem hole 111 formed above the control hole 106 and controlling the flow of fluid while being connected to and detached from the valve seat 105, A packing (115) is interposed between the outer diameter portion of the valve stem (120) and the stem hole (111) to maintain airtightness.

The valve stem 120 is provided with an operation shaft 118 which is held in the valve body 102 by the interlocking nut 116 and the ground 117 to be forwardly and reversely rotated. And an operating means 119 such as a knob, a lever or an actuator for moving the operating shaft 118 in the forward and reverse directions is fixed.

The valve stem 120 has a tip portion 124 having a diameter smaller than the diameter of the stem body 123 and connected to the valve seat 105 at the lower end of the stem body 123, And a stem head (125).

According to the present invention, the valve stem 120 is improved so that the ultra-high pressure fluid is positioned below the stem hole 111, and the backup ring 121 and the packing 115, which maintain the hermeticity of the valve stem 120, So that the cause of damaging and hindering the airtightness can be blocked.

To this end, the stop means 130 may further include a stop means 130 for distributing pressure while guiding the super high pressure to the boundary position between the stem body 123 and the stem head 125 and guiding the pressure toward the stem head 125.

The blocking means 130 integrally forms the blocking body 131 having the diameter smaller than the diameter D of the control hole 106 in the valve stem 120 and the stopping body 131 The fluid movement surface 132 is formed on the outer surface of the discharge port 104 so that the fluid does not interfere with the movement of the fluid to the discharge port 104 even if the blocking body 131 is positioned lower than the discharge port 104 during operation.

The fluid movement surface 132 may be formed in various shapes such as a shape in which one or more cut surfaces are formed in the blocking body 131, a concave shape such as a semicircular shape, a mountain shape, or a rectangular shape, It is preferable that the valve stem 120 is formed in two or more directions rather than being formed in only one direction so that the balance of the valve stem 120 is not biased in one direction by the fluid or fluid pressure.

A lower end 133 of the stem head 125 is connected to a lower end 134 of the blocking body 131 so as to prevent fluid or pressure from being excessively conducted to the blocking body 131. [ Has a relaxed surface 135 that is connected in an oblique or arcuate shape.

A diffusion guide surface 136 for guiding the fluid or pressure to the upper side of the relief surface 135 while preventing the fluid or pressure from moving upward and diffusing the fluid or the pressure in the downward direction of the stem head 125 is further formed.

3 and 4, the diffusion guide surface 136 may have a shape that horizontally connects the upper end 137 of the mitigating surface 135 and the lower end 134 of the blocking body 131, The lower end 134 of the blocking body 131 is connected to the upper end 137 of the mitigation surface 135 and the lower end 134 of the blocking body 135 in an arc- 137), it can be connected in a mountain-like shape or a circular arc shape, and so on.

Hereinafter, the operation of the valve stem for an ultra-high pressure valve according to the present invention will be described.

The fluid is supplied to the use place through the outlet 104 after passing through the control hole 106 through the inlet 103 and the control stem 110 installed at the top of the control hole 106 causes the valve stem 120 are moved upward and downward to connect and disengage from the valve seat 105 to select the flow of the fluid or adjust the amount of the fluid. Therefore, detailed description thereof will be omitted and the valve stem 120 ) In order to prevent or disperse fluid or pressure.

The flow of the fluid is blocked when the valve stem 120 descends and is completely connected to the valve seat 105 so that the influence of the fluid or the pressure is transmitted to the valve stem 120 or the backup ring 121 or the packing 115, Pressure fluid is moved while the valve stem 120 is lifted to allow the fluid to move.

The fluid or pressure is dispersed and diffused toward the stem head 125 by the blocking means 130 integrally formed at the boundary position between the stem body 123 and the stem head 125, It is prevented from being conducted to the backup ring 121 and the packing 115, and the movement of the fluid is not hindered.

Specifically, when the fluid or pressure is moved upwardly of the stem head 125, it is first relieved by the relief surface 135 formed on the lower side of the blocking body 131, and then the relief surface 135 and the blocking body 135 131 by the diffusion inducing surface 136 formed at the end of the stem head 125 and at the same time,

In other words, the relief surface 135, which is formed obliquely below the blocking body 131, prevents fluid or pressure from being suddenly transferred to the valve stem 120 to prevent the valve stem 120 from being impacted, And the diffusion inducing surface 136, it is possible to minimize pressure conduction to the upward direction.

Therefore, the valve stem 120, the backup ring 121, and the packing 115 are prevented from being deformed, damaged or abraded due to a high pressure without any obstacle to fluid movement, Lt; / RTI >

Particularly, since the fluid moving surface 132 is formed on the outer surface of the blocking body 131, the valve stem 120 is lowered and the valve seat 105 is moved downward even when the blocking means 130 is positioned lower than the outlet 104 So that the passing fluid does not hinder the movement to the discharge port 104.

The present invention eliminates abrasion, damage and flow phenomenon of the valve stem, the backup ring and the packing to thereby ensure smooth operation and satisfy the quality and durability of the ultra-high pressure valve, and can be advantageous in external competitiveness .

100; Ultra high pressure valve 102; Valve body
103; Inlet 104; outlet
105; Valve seat 106; Control hole
111; Stem hole 115; packing
120; Valve stem 123; Stem body
125; Stem head 130; Blocking means
131; A blocking body 132; Fluid moving surface
135; Relaxation surface 136; Diffusion guide surface

Claims (3)

A control hole 106 is formed between the inlet 103 and the outlet 104 and a valve seat 105 is interposed between the inlet 103 and the outlet 104, A valve body 102 forming a valve body 102;
The control valve 106 is positioned in the stem hole 111 formed above the control hole 106 and is opened or closed with the valve seat 105 in a state of being connected to or detached from the valve seat 105 to control the flow of the fluid, A seal 115 interposed between the outer diameter portion of the valve stem 120 and the stem hole 111 so as to maintain airtightness; And a control means (110) for selecting a flow of the fluid including an operating shaft (118) held by the valve body (102) by the valve body (117) for forward and reverse rotation of the valve stem ;
Pressure is distributed to the boundary position between the stem body 123 and the stem head 125 and the pressure is dispersed and guided in the direction of the stem head 125 so that the pressure of the backup ring 121, Further comprising blocking means (130) for blocking the cause of damage, abrasion and hindrance of airtightness due to flow. The method of claim 1, further comprising:
The blocking means 130 includes a blocking body 131 integrally formed with the valve stem 120 with a diameter smaller than the diameter D of the control hole 106;
A fluid moving surface 132 formed on an outer surface of the blocking body 131 to prevent fluid from moving to the outlet 104 even if the blocking body 131 is positioned lower than the outlet 104 during operation;
The lower end 133 of the stem head 125 is connected to the lower end 134 of the blocking body 131 so that fluid or pressure can be prevented from being excessively conducted to the blocking body 131 under the blocking body 131. [ And a relief surface (135) connected in an oblique or circular arc shape. 3. The method of claim 2,
And a diffusion inducing surface 136 for guiding the fluid or pressure to the upper end of the relief surface 135 while preventing the fluid or pressure from moving upward and diffusing the fluid or pressure in the lower end direction of the stem head 125 is further formed Valve stem for ultra high pressure valve.

Images