KR20090127859A - Check type pressure reducing valve - Google Patents

Abstract

PURPOSE: A check integrated depressurization valve is provided to elastically support an operational shaft with relatively smaller elasticity than the pressure of a pressure spring in an internal space formed between a stem and an insertion member or an internal space formed between a lower stopper and a disc, thereby preventing the backflow of a fluid. CONSTITUTION: A check integrated depressurization valve(100) comprises a valve body(110), a spring cover(120), a lower cover(130), a pressure spring(150), an insertion member(145), an operational shaft(160), and a backflow prevention unit. The spring cover is coupled to the opened upper side of the valve body. The lower cover is coupled to the opened lower side of the valve body. The pressure spring pressurizes the diaphragm(pressure spring) downward which is upward carried with pressure applied to the inside of the space of an outlet. The insertion member seals up an internal space opened to the lower part of a stem(140) inserted into the guide cavity of the valve body. The operational shaft comprises a disc(164). The disc is close to a circulation hole(114) or is separated to open and shut a fluid flow path. The backflow prevention unit supports the operational shaft upward elastically with elastic force relatively smaller than the pressure of the pressure spring to the upward.

Description

Check type Pressure Reducing Valve

The present invention relates to a check-integrated pressure reducing valve having a backflow prevention function, and more particularly, it is possible to improve the reliability of the valve product by preventing a backflow phenomenon of the fluid through the open hole in a state in which the fluid supply is stopped or unloaded. The present invention relates to a check-integrated immersion valve capable of reducing the total volume of the product and increasing the price competitiveness by providing a check function for preventing backflow inside the valve body. .

In general, the pressure reducing valve is a type of valve installed in the pipe to maintain the reduced pressure constant after reducing the fluid having a primary pressure higher than the intended use to a secondary pressure suitable for the intended use. It is used to maintain a constant pressure by reducing the pressure of gas, water, etc.

1 is a longitudinal cross-sectional view showing a pressure reducing valve according to the prior art, the conventional pressure reducing valve 1, as shown in Figure 1, the inlet 11 through which the fluid is introduced, and the inflow fluid is discharged outside It is provided with a valve body (10) having a discharge port (12) and a partition wall (13) having a predetermined sized distribution hole (14) in a substantially central portion of the inlet port (11) and the outlet port (12).

An open upper side of the valve body 10 is provided with a spring cover 20 coupled thereto, and an open lower side of the valve body 20 also has a lower stopper 30 coupled thereto, and the valve body ( 10) the disk 42 having a disk packing 42a for contacting or spaced apart from the flow hole (14) to be opened and closed at the lower end, and up and down in the guide hole (18) of the valve body (10) It has a stem 46 that is movably assembled and an actuating shaft 40 that is assembled.

Between the valve body 10 and the spring cover 20 for pressing the operating shaft 40 downward with the diaphragm 52 moved upward by the pressure applied to the inside of the outlet space of the valve body 10. It is provided with a spring 50, the upper end of the spring cover 20 is provided with an adjustment bolt 54 for adjusting the pressing force of the spring (50).

Accordingly, by adjusting the pressing force of the spring member 50 to a predetermined pressure reduction pressure by the rotation operation of the adjustment bolt 54, if the fluid is supplied through the inlet 11 of the valve body 10 In addition, the disk 42 is moved downwardly along with the operation shaft 40 by the fluid pressure introduced by a predetermined pressure setting, and opens the flow hole 13, thereby discharging the fluid having a constant fluid pressure outlet 12. It can be discharged to the other side through.

However, when the fluid supply through the inlet 11 is temporarily stopped or in a no-load state, the disc 42 which is downward by the depressurizing force set for opening of the flow hole 13 is raised to prevent backflow. The distribution hole 13 should be sealed so that the distribution hole 13 has a large friction force between the stem 46 and the guide hole 18 assembled to the guide hole 18 of the valve body 10 so as to be movable. As a result, the fluid at the outlet flowed backward through the flow hole 13, resulting in a failure to seal the product rapidly.

In order to prevent such a backflow, a check valve for preventing a backflow function must be separately provided at the inlet 11 of the valve body 10, thereby increasing the overall volume of the valve and increasing the manufacturing cost of the valve product. It was.

Accordingly, the present invention is to solve the above problems, the object is to prevent the backflow of the fluid through the open flow hole in the pause or no load of the fluid supply to increase the reliability of the valve product, the backflow It is to provide a check-integrated pressure reducing valve that can reduce the overall volume of the product by providing a check function for preventing the inside of the valve body, and increase the price competitiveness.

As a specific means for achieving the above object, the present invention is to reduce the pressure of the fluid flowing through the inlet port, in the pressure reducing valve for discharging the fluid decompressed at a constant pressure to the outside through the inlet and outlet A valve body having a distribution hole therebetween; A spring cover coupled to the open upper side of the valve body; A lower stopper coupled to the open lower side of the valve body; A pressure spring disposed between the valve body and the spring cover to provide an elastic force for downwardly pressing the diaphragm moved upward by a pressure applied inside the space of the outlet; An insertion member assembled to seal an inner space opened to a lower portion of the stem inserted into the guide hole of the valve body; An actuating shaft, which is assembled to the center hole penetratingly formed in the center of the body of the insertion member, and having a disk contacting or spaced apart from the flow hole to open and close the fluid flow path of the flow hole; and a pressing force of the pressure spring. And a backflow prevention part that elastically supports the operating shaft upward with a relatively small elastic force and elastically supports the operating shaft upwardly so that the disk contacts the distribution hole when the fluid supply through the inlet is temporarily stopped or unloaded. A check integrated pressure reducing valve is provided.

Preferably, the backflow prevention part is formed of an upper elastic body disposed in an inner space formed between the stem and the insertion member and having an upper end in contact with an end plate provided at an end of the operating shaft, and having a lower end in contact with a bottom surface of the insertion member.

More preferably, the upper elastic body is provided to have a relatively low elastic force than the friction between the outer surface of the stem and the inner surface of the guide hole.

More preferably, the end plate is made of a plate member that can be screwed or detached to the male screw portion formed on the upper end of the operating shaft or is integrally provided on the upper end of the operating shaft.

Preferably, the backflow prevention part is disposed in an inner space formed between the lower stopper and the disc, the upper end is in contact with the disk, the lower end is made of a lower elastic body in contact with the bottom surface of the lower stopper.

More preferably, the lower elastic body is provided to have a relatively low elastic force than the friction between the outer surface of the stem and the inner surface of the guide hole.

More preferably, the insertion member has a male screw portion screwed to the female screw portion formed on the upper inner surface of the recessed portion formed in the stem on the upper outer surface.

More preferably, the disk has a disk main body having a disk packing in contact with the sheet provided in the distribution hole, and a lower groove which is assembled to correspond to the protrusion formed to project a certain height from the bottom surface of the lower stopper to form a lower portion of the operating shaft Screwed to the end.

According to the present invention, the fluid supply through the inlet can be supported by elastically supporting the operating shaft upwards with an elastic force relatively smaller than the pressing force of the pressure spring in the inner space formed between the stem and the insertion member or the lower stopper and the disk. It can diversify the function of valve products and improve product reliability by preventing the backflow of fluid from the outlet to the inlet so that the disk can contact the distribution hole in the paused or no-load state and close the fluid passage naturally and quickly. Can be.

In addition, it is possible to reduce the total volume of the valve product, to miniaturize the valve product, and to increase the price competitiveness by providing a check function for preventing the backflow inside the valve body without having to separately include the valve body outside. Effect is obtained.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a longitudinal sectional view showing a check integrated pressure reducing valve according to a first embodiment of the present invention.

As shown in FIG. 1, the pressure reducing valve 100 according to the first embodiment of the present invention is provided with a fluid, such as a liquid or a gas, installed in one direction in the middle of a length of a pipe (not shown). The valve body 110 and the spring cover 120 to reduce the pressure, and to discharge the fluid decompressed to a certain pressure to the outside through the outlet port and at the same time to prevent the flow of the fluid back flow in the suspended or no-load state ), The lower stopper 130, the stem 140, the pressure spring 150, the working shaft 160 and the backflow prevention portion 170.

The valve body 110 has an inlet 111 through which fluid is introduced, an outlet 112 through which the inflowed fluid is discharged externally, and a distribution hole 114 having a predetermined size in a substantially central portion of the inlet 111 and the outlet 112. It is a metal structure of a metal material such as brass having a partition 113 formed with a).

The inside of the valve body 110 is formed through the guide hole 118 through which the stem 140 is disposed to be placed in the upper portion of the distribution hole 114, the stem 140 on the inner peripheral surface of the guide hole 118 O-ring (118a) in contact with the outer surface of the) to prevent leakage of fluid.

The spring cover 120 is coupled to seal the open upper portion of the valve body 10, the diaphragm (pressure spring 150) disposed between the valve body 110 and the spring cover 120 to the external environment It is a cover member to protect from.

The lower stopper 130 is coupled to seal the open lower portion of the valve body 20, and the bottom surface is correspondingly assembled with the lower groove 164c of the disk to guide the movement of the disk 164, which will be described later. It has a protrusion 132 of a predetermined height.

The pressure spring 150 is disposed between the valve body 110 and the spring cover 120 to move the diaphragm 152 downward by a pressure applied to the inside of the space of the outlet 112. Coil-like elastic member that provides a constant strength of the elastic force to press.

The pressure spring 150 is the spring pressing plate 155 and the upper surface of the diaphragm 152 is coupled to the control bolt 154 assembled on the top of the spring cover 120 to adjust the pressing force of the pressure spring 150. It is disposed between the pressure plate 156 in contact with.

Here, the center of the body of the diaphragm 152 is inserted into the extension portion 142 extending a certain height from the center of the upper surface of the stem 140, the bottom surface is in contact with the upper surface of the stem 140, the extension portion ( The nut member 143 is fastened to the pressure plate and the diaphragm so that it is difficult to detach from the outside, and the outer edge of the diaphragm 152 is pressed and fixed by the pressing ring 157 assembled to the upper side of the valve body.

Insertion member 145 coupled to the stem 140 is shown in Figures 2 and 3, to open the lower portion of the stem 140 inserted into the guide hole 118 of the valve body 110. Inserted from the bottom into the recessed recessed portion 141 is assembled to seal the open inner space of the stem 140, through the central hole 146 to be assembled to the operating shaft 160 and the operating shaft ( 160 has an inner space in which the upper end is disposed.

The insertion member 145 is preferably inserted into the recessed portion 141 so as not to protrude downward from the stem 140, and the stem 140 and the upper outer surface of the insertion member 145. It is provided with a male screw portion 145a fastened with the female screw portion 141a formed on the upper inner surface of the recessed portion 141 so that the assembly is easy and the lower detachment after assembly is difficult.

The operating shaft 160 has an upper end inserted through the central hole 146 formed through the center of the body of the insertion member 145 is disposed in the inner space of the insertion member 145, the central hole 146 It is a shaft member of a certain length that is assembled so as to be movable, and the upper end of the operating shaft 160 is provided with an end plate 162 disposed to contact the step 145a formed in the inner hole of the insertion member 145. .

The working shaft 160 has a disk 164 in contact with or spaced apart from the flow hole 113 to open and close the fluid flow path of the flow hole 114, the disk 164 is the flow hole 114 The disk body 164b having a disk packing 164a in contact with the annular sheet 114a assembled to the disk body 164b, and the disk body 164b is a protrusion 132 protruding a predetermined height from the bottom surface of the lower stopper. The lower groove 164c is assembled to correspond to the screw is assembled to the lower end so as to move together with the operating shaft 160.

Here, a stopper 164d in contact with the disk packing 164a is provided in the middle of the length of the operation shaft 160.

On the other hand, the backflow prevention unit 170 is always elastically supported upwards by the operating shaft 160 with an elastic force relatively smaller than the pressing force of the pressure spring 150, the fluid supply through the inlet 111 is temporarily stopped or In order to prevent the backflow of the fluid through the flow hole 114 in the no-load state, the operating shaft 160 is elastically supported upward so that the disk packing 164a of the disc is in close contact with the seat of the flow hole 114. It is.

As shown in FIGS. 2 and 3, the non-return portion 170 is disposed at an inner space formed between the stem 140 and the insertion member 145 and is provided at an end of the operating shaft 160. The upper end is in contact with the end plate 162, the lower end is in contact with the bottom surface of the insertion member 145 may be made of an upper elastic body 171 to elastically support the operating shaft 160 upward.

Here, the end plate 162 is shown and described as being made of a plate member that can be screwed or detached to the male screw portion formed on the upper end of the operating shaft 160, but is not limited thereto. It may be provided integrally at the top.

In addition, as shown in FIG. 4, the backflow prevention unit 170 is disposed in an inner space formed between the lower stopper 130 and the disk 164, and an upper end thereof is in contact with the disk 164. The bottom surface of the stopper 130 may be in contact with the lower elastic body 171 to elastically support the operating shaft 160 upward.

Here, the upper elastic body 171 and the lower elastic body 172 is shown and described as being provided in the form of a coil spring, but is not limited to this, and various elastic materials having an elastic restoring force that is contracted by an external force and returns to its original state upon release of the external force. May be optionally provided.

In addition, the upper elastic body 171 or the lower elastic body 172, the stem 140 is assembled so as to be movable in the guide hole 118 of the valve body 110 is the upper elastic body 171 or lower elastic body 172 It is preferable to set the elastic force relatively lower than the frictional force between the outer surface of the stem 140 and the inner surface of the guide hole 118 so that it is difficult to move the vertical position by the elastic force provided by.

5 (a) (b) (c) are operation state diagrams of the check integrated pressure reducing valve according to the first embodiment of the present invention.

First, as shown in Figure 5 (a), by adjusting the adjustment bolt 154 to apply the maximum pressure to the upper portion of the pressure spring 150 to set the set pressure to a specific pressure to be reduced, As the pressure spring 150 is compressed, the pressure spring 150 provides a pressing force for pressing the diaphragm 152 and the stem 140 in direct contact therewith.

In addition, the stem 140 assembled to the guide hole 118 of the valve body 110 is assembled to be movable along the guide hole, and the distribution hole 114 is the stem 140 and the insertion member 145. The fluid flow path is closed by contacting the disk 164 assembled to the operation shaft 160 which is elastically supported upward by the elastic force of the upper elastic body 171 compressed and compressed between the ends and the end of the operation shaft 160. The provided end plate 162 may be in contact with or spaced apart from the step 145a.

Here, the distribution hole 114 of the second embodiment disclosed in FIG. 4 is provided on the operation shaft 160 that is elastically supported upward by the elastic force of the lower elastic body 172 disposed between the disk 164 and the lower stopper 130. The fluid flow path is blocked by contact with the assembled disk 164, and the end plate 162 provided at the end of the operating shaft 160 is in contact with or is spaced apart from the step 145a.

In this state, as shown in FIG. 5 (b), when a fluid having a constant fluid pressure flows through the inlet 111, the disk and the fluid are forced by the fluid pressure of the fluid introduced into the inlet 111. In addition, since the operation shaft 160 is lowered downward to open the flow hole 114, the fluid is decompressed and discharged to the outlet 112 according to a predetermined pressure by the pressure spring, and at this time, the stem 140 is also The end plate 162 and the step 145a are lowered together with the operating shaft by the locking.

On the other hand, as shown in Figure 5 (c), the fluid supply through the inlet 111 is temporarily stopped or no load state, the fluid pressure in the internal space of the inlet 111 is switched to the atmospheric pressure state or the outlet ( When lower than the internal pressure of the 111, the contracted upper elastic body 171 is elastically supported by the end plate 162 upwards by the elastic restoring force while the external force is released to quickly raise the operating shaft 160 to the upper portion By doing so, the flow hole 114 is closed by being in contact with the disk 164 which is raised together with the working shaft in a short time by the elastic restoring force of the upper elastic body 171.

As a result, it is possible to fundamentally prevent a phenomenon in which the fluid of the outlet flows back to the inlet side through the distribution hole at the time of stopping or no load of the fluid supply through the inlet 111.

Subsequently, when the stem 140, which has been lowered along the guide hole 118 at the time of opening of the distribution hole 113, is raised and returned to an initial state, the rising of the stem 140, which is raised and returned, causes the disk to have a sheet ( Since the end plate 162 disposed inside the insertion member is lowered in the internal hole of the insertion member because it is in contact with 113a), the upper elastic body 171 is recompressed to an initial state, and the end plate 162 As shown in FIG. 5 (a), the return return of the stem 140 is stopped when the stepped contact with the step 145a occurs.

While the invention has been shown and described with respect to particular embodiments, it will be understood that various changes and modifications can be made in the art without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

1 is a longitudinal sectional view showing a pressure reducing valve according to the prior art.

2 is a longitudinal sectional view showing a check integrated pressure reducing valve according to a first embodiment of the present invention.

Figure 3 is an exploded perspective view of the insertion member, the upper elastic body and the operating shaft employed in the check integrated pressure reducing valve according to the first embodiment of the present invention.

4 is a longitudinal sectional view showing a check integrated pressure reducing valve according to a second embodiment of the present invention.

5A, 5B and 5C are longitudinal cross-sectional views showing the check integrated pressure reducing valve according to the first embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: valve body 111: inlet

112: outlet 113: bulkhead

114: distributor 118: guide

120: spring cover 130: lower cap

140 stem 145 insertion member

146: center hole 150: pressure spring

160: working shaft 162: end plate

164: disk 170: backflow prevention unit

171: upper elastic body 172: lower elastic body

Claims (8)

In the pressure reducing valve for reducing the pressure of the fluid flowing through the inlet port, and discharges the pressure reduced to a constant pressure to the outside through the outlet, A valve body having a distribution hole between the inlet and the outlet; A spring cover coupled to the open upper side of the valve body; A lower stopper coupled to the open lower side of the valve body; A pressure spring disposed between the valve body and the spring cover to provide an elastic force for downwardly pressing the diaphragm moved upward by a pressure applied inside the space of the outlet; An insertion member assembled to seal an inner space opened to a lower portion of the stem inserted into the guide hole of the valve body; An operating shaft having a disk which is assembled to the center hole penetratingly formed in the center of the body of the insertion member, the disk being in contact with or spaced apart from the flow hole to open and close the fluid flow path of the flow hole; and Resilient support of the operating shaft upwards with an elastic force relatively smaller than the pressing force of the pressure spring to prevent the back flow to elastically support the operating shaft upwards so that the disk contact the flow hole when the fluid supply through the inlet is suspended or no load state Integrated check pressure reducing valve, characterized in that it comprises a portion. The method of claim 1, The backflow prevention part is disposed in an inner space formed between the stem and the insertion member, the upper end is in contact with the end plate provided at the end of the operating shaft, the bottom of the insertion member is characterized in that the upper elastic body made of contact Pressure reducing valve with integrated check. The method of claim 2, The upper elastic body is a check integrated pressure reducing valve, characterized in that it is provided to have a relatively low elastic force than the friction between the outer surface of the stem and the inner surface of the guide hole. The method of claim 2, The end plate is made of a plate member that can be screwed or detached from the male screw portion formed on the upper end of the operating shaft or is integrally provided on the upper end of the operating shaft. Check integrated pressure reducing valve, characterized in that. The method of claim 1, The backflow prevention part is disposed in the inner space formed between the lower stopper and the disc, the check integrated pressure reducing valve, characterized in that the upper end is in contact with the disk, the bottom of the lower stopper is in contact with the bottom surface. The method of claim 5, The lower elastic body is a check integrated pressure reducing valve, characterized in that it is provided to have a relatively low elastic force than the friction between the outer surface of the stem and the inner surface of the guide hole. The method according to any one of claims 1 to 6, The insertion member is a check-integrated pressure reducing valve, characterized in that the male screw portion that is screwed with the female screw portion formed on the upper inner surface of the depression formed in the stem on the upper outer surface. The method according to any one of claims 1 to 6, The disk has a disk body having a disk packing in contact with the sheet provided in the distribution hole and the lower groove corresponding to the protrusion formed to the predetermined height protruding from the bottom surface of the lower stopper to form a screw assembly on the lower end of the working shaft Check integrated pressure reducing valve.

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