KR20190052662A - Differential pressure control valve - Google Patents

Abstract

Disclosed is a flow control valve. According to an embodiment of the present invention, the differential pressure flow control valve comprises: a valve housing including a valve seat unit having a valve inlet on one side thereof to allow hot water to flow thereinto, a valve outlet on another side thereof to discharge hot water, and a valve orifice which is arranged between the valve inlet and the valve outlet and connects the valve inlet and the valve outlet, and a connection flow passage to connect the valve inlet and the valve orifice; a valve plug assembly having a valve plug movably arranged in the valve housing to open and close the valve orifice; and an auxiliary flow control unit installed on the valve housing to control a flow of hot water through the connection flow passage. The auxiliary flow control unit comprises: a unit body which has a unit body opening connecting the valve inlet and the valve orifice, and is arranged in the connection flow passage; a unit head movably arranged on the unit body opening to be pushed into the unit body by a pressure of hot water flowing into the valve inlet; a unit head passage extended from a side of the unit head in the moving direction of the unit head to allow hot water flowing into the valve inlet to flow thereinto; and a unit spring arranged in the unit body to apply an elastic force in a direction of protruding from the unit body with respect to the unit head.

Description

[0001] The present invention relates to a differential pressure control valve,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential pressure regulating valve, and more particularly, to a differential pressure regulating valve, which is applied to a hot water heating system to accurately and stably control the flow rate of hot water, The present invention relates to a differential pressure regulating valve capable of regulating the flow of hot water at a proper pressure and a proper flow rate even if the flow pressure of the hot water changes abruptly due to flow resistance or the like.

In a heating system used in apartment houses or buildings, heating is performed by an independently installed boiler, and the fluid is heated by a separate heat source installed outside, It can be distinguished by group heating which carries out heating, and group heating can be further divided into central heating using a heat source such as a central boiler and district heating using a heat source such as an external regional power plant.

Such a heating system has a structure in which each household is heated by a hot water distributor from a central supply pipe for supplying hot water heated by a heat source, and then the hot water return pipes for each household are concentrated to the central water return pipe and then returned to the heat source. In the case of collective heating, a system has been proposed in which a differential pressure regulating valve is attached to each hot water distributor for each household in order to provide uniform heating for each household.

For example, Korean Utility Model Registration No. 20-0254789 (registered on November 07, 2001) discloses a differential pressure regulating valve in which a flow rate limiting valve capable of regulating the opening and closing amount of a flow rate regulator is integrally installed have.

However, the conventional differential pressure flow rate control valve as described above has a complicated valve structure because the lower cone is separately provided at the lower end portion of the body to adjust the opening and closing amount of the flow rate control valve. In addition, The excessively high hydraulic pressure is directly transferred to the lower cone and the upper cone, so that it is impossible to precisely control the flow rate. Further, when the fluid velocity suddenly changes and the fluid pressure suddenly rises or falls, the expansion and contraction of the diaphragm suddenly repeats, and the opening and closing rate of the flow rate regulator is suddenly controlled by the upper cone, have.

Korean Utility Model Registration No. 20-0254789 (registered on November 07, 2001)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a differential pressure regulating valve capable of precisely and stably controlling the flow rate of hot water so that hot water necessary for heating operation can flow, .

Another object of the present invention is to provide a differential pressure flow rate control valve that can control the flow of hot water at a proper pressure and a suitable flow rate even if the flow pressure of the hot water suddenly changes due to a change in heating load or a flow resistance of hot water .

The objects of the present invention are not limited to those described above, and other objects not mentioned may be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, according to one aspect of the present invention, there is provided a differential pressure regulating valve comprising a valve inlet through which hot water is introduced into one side and a valve outlet through which hot water is discharged from the other side, A valve seat disposed between the valve discharge port and having a valve seat portion provided with a valve orifice connecting the valve inlet and the valve discharge port, and a connection channel connecting the valve inlet and the valve orifice; A valve plug assembly including a valve plug movably disposed within the valve housing to open and close the valve orifice; And an auxiliary flow rate adjusting unit installed in the valve housing to adjust a flow rate of the hot water through the connection channel.

Wherein the auxiliary flow rate control unit comprises: a unit body having a unit body opening connecting the valve inlet and the connection passage, the unit body being disposed in the connection passage; A unit head movably disposed in the unit body opening so as to be pushed into the unit body by a pressure of hot water flowing into the valve inlet; A unit head passage extending in a moving direction of the unit head at a side of the unit head so that hot water flowing into the valve inlet can be introduced; And a unit spring disposed inside the unit body to apply an elastic force to the unit head in a direction protruding from the unit body.

The unit head passage may have a shape in which the width of the unit head gradually increases in a direction in which the unit head enters the unit body.

A unit body passage through which the hot water flowing into the unit head passage flows is provided inside the unit body and a unit body passage connecting the unit body passage and the valve orifice is provided on the side of the unit body.

A unit sieve net can be disposed between the valve orifice and the unit body to filter foreign substances in the hot water.

The unit body passage may extend in a direction in which the unit head enters into the unit body so as to be covered by the unit head entering the unit body.

The unit body passage may have a shape in which the width gradually decreases in a direction in which the unit head enters the unit body.

Wherein the valve housing is provided with a valve housing opening connected to the connection passage and the auxiliary flow rate control unit is detachably coupled to the valve housing to open and close the valve housing opening to support the unit body, .

Further, the differential pressure control valve according to an embodiment of the present invention includes: a differential pressure chamber provided inside the valve housing to be connected to the valve orifice; And a second chamber communicating with the valve plug so that the valve plug can be elastically deformed by a pressure difference between the first chamber and the second chamber to move the valve plug, A diaphragm; A plug channel provided inside the valve plug to connect the valve orifice and the first chamber; And a bypass passage provided in the valve housing to be connected to the second chamber to bypass hot water from the outside of the valve housing to the second chamber.

The valve plug assembly is screw-movably coupled to the valve housing to elastically deform the diaphragm. One end of the valve actuator is coupled to the valve actuator to receive rotational force from the valve actuator, and the other end is disposed in the second chamber A plug stem movably disposed on the inside of the movable support and having one end penetrating a diaphragm through hole provided in the diaphragm and coupled with the valve plug; And a plug support spring disposed inside the movable support to elastically support the plug stem to apply an elastic force in a direction away from the movable support.

The differential pressure regulating valve according to the present invention as described above is simple in structure and excellent in durability and can precisely and stably control the amount of opening of the inner flow passage through which hot water flows.

In addition, the differential pressure control valve according to the present invention can be adjusted so that the hot water flows at an appropriate pressure and a suitable flow rate even if the flow pressure of the hot water suddenly changes due to a change in heating load or a flow resistance of hot water.

Accordingly, it is possible to perform a stable heating operation as compared with the prior art, to reduce the damage or breakage of parts due to sudden pressure change of the hot water, and to further increase the heating efficiency.

The effects of the present invention are not limited to those described above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a cross-sectional view illustrating a differential pressure control valve according to an embodiment of the present invention.
2 is an exploded view of a differential pressure flow control valve according to an embodiment of the present invention.
3 is another sectional view showing the differential pressure flow control valve according to an embodiment of the present invention in another direction.
4 to 5 are exploded views of an auxiliary flow rate control unit of a differential pressure flow rate control valve according to an embodiment of the present invention.
6 is a cross-sectional view illustrating an auxiliary flow rate control unit of a differential pressure flow rate control valve according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In addition, in the various embodiments, elements having the same configuration are denoted by the same reference numerals and only representative embodiments will be described. In other embodiments, only the configurations other than the representative embodiments will be described.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" between other parts. Also, when a component is referred to as " comprising ", it may mean that it does not exclude other components as well as other components, unless specifically stated otherwise.

The differential pressure regulating valve 100 according to an embodiment of the present invention controls the flow of the hot water heating system according to the pressure of the hot water supplied through the hot water supply pipe (hereinafter referred to as 'the supply pipe') of the hot water heating system and the heating load of the hot water heating system. By actively controlling the flow rate of the hot water that is returned through the hot water return pipe (hereinafter referred to as the 'return pipe'), it is possible to reduce the waste of hot water and enable efficient heating operation.

The differential pressure regulating valve 100 includes a valve housing 110 connected to the middle of the water return pipe so that the hot water flowing along the water return pipe can pass therethrough, And an auxiliary flow rate control unit 170 for stabilizing the flow rate of the hot water passing through the valve housing 110. The valve-

The valve housing 110 includes a base housing 111 connected to the water return pipe and a diaphragm housing 130 connected to the base housing 111 so that hot water passing through the base housing 111 can be introduced.

The base housing 111 includes a valve housing inlet 112 into which hot water flows from a water returning pipe, a valve housing outlet 114 through which hot water is discharged, a valve housing inlet 112 and a valve housing outlet 114, And a valve housing extension portion 118 connecting the valve housing inlet portion 112 and the valve seat portion 116 so as to allow hot water flow.

The valve housing inlet 112 is provided with a valve inlet 113 into which hot water flows and the valve housing outlet 114 is provided with a valve outlet 115 through which hot water is discharged. The valve seat portion 116 is provided with a valve orifice 117 through which hot water can pass. The valve housing extension 118 is provided with a connection passage 119 for connecting the valve inlet 113 and the valve orifice 117 to each other. The valve seat portion 116 is disposed so as to face the end of the valve plug 151 so that the valve orifice 117 inside the valve seat portion 116 can be opened and closed by the valve plug 151 of the valve plug assembly 150 to be described later. The connecting flow passage 119 is disposed obliquely with respect to the flow direction of the hot water flowing along the valve housing inlet portion 112. The hot water flowing into the valve inlet 113 can be discharged through the valve outlet 115 after passing through the connection passage 119 and the valve orifice 117. [

A pipe connector 122 and a valve cap 124 are coupled to the base housing 111. The pipe connection port 122 is coupled to the valve housing inlet 112 and is used to connect the valve housing inlet 112 with the return pipe. The pipe connection port 122 may be provided in the valve housing discharge portion 114 and may have various structures other than the illustrated structure. The valve cap 124 is detachably coupled to the base housing 111 so as to open and close an insertion hole (not shown) formed in the middle of the base housing 111. A measuring instrument or the like for measuring the physical properties of hot water passing through the valve housing 110 such as a pressure gauge or a flow meter may be inserted into the insertion hole of the base housing 111 after the valve plug 124 is separated from the base housing 111 have.

A valve housing connection part 126 is provided on one side of the base housing 111 and the base housing 111 and the diaphragm housing 130 are connected to each other through a valve housing connection part 126 to be capable of hot water flow. A valve guide passage 127 through which hot water can flow is provided inside the valve housing connection portion 126 and a valve plug 151 is movably disposed in the valve guide passage 127.

Diaphragm housing 130 includes diaphragm housing base 131 and diaphragm housing cover 132. A differential pressure chamber 133 is provided in the diaphragm housing 130. The diaphragm 140 connected to the valve plug 151 is disposed in the differential pressure chamber 133. The differential pressure chamber 133 is partitioned by the diaphragm 140 into a first chamber 134 below the diaphragm 140 and a second chamber 135 above the diaphragm 140.

The diaphragm housing base 131 is open in an upward direction and recessed inwardly. The diaphragm housing base 131 is coupled to the valve housing connection portion 126 and the concave space inside the diaphragm housing base 131 is connected to the valve guide passage 127 of the valve housing connection portion 126 do.

The diaphragm housing cover 132 is open in the downward direction and is recessed inwardly. The diaphragm housing cover 132 can be tightly adhered to the diaphragm housing base 131 without any gap through a fixing member such as a bolt as shown. At one side of the diaphragm housing cover 132, a hollow diaphragm housing neck portion 136 extending toward the valve actuator (not shown) is provided. The inner circumferential surface of the diaphragm housing neck portion 136 is provided with a female thread 137 for screw connection with a movable support 162 of a valve plug assembly 150 to be described later. A bypass flow passage 138 is formed at one side of the diaphragm housing neck portion 136 to be connected to the second chamber 135. A bypass pipe 150 connected to a supply pipe (not shown) is connected to the bypass flow path 138. Therefore, hot water supplied through the bypass pipe 150 can be introduced into the second chamber 135 through the bypass pipe 150 and the bypass pipe 138.

The diaphragm 140 disposed in the differential pressure chamber 133 has a thin disc shape and is made of a material that is elastically deformable. The diaphragm 140 is disposed in the middle of the differential pressure chamber 133 with its rim portion interposed between the diaphragm housing base 131 and the attachment portion of the diaphragm housing cover 132. As shown, disks 142 can be disposed on both sides of the diaphragm 140. A diaphragm through hole 141 is provided at the center of the diaphragm 140. The diaphragm 140 can move the valve plug 151 while being elastically deformed by a pressure difference between the first chamber 134 and the second chamber 135. That is, when the pressure of the hot water flowing into the second chamber 135 becomes larger than the pressure of the hot water flowing into the first chamber 134, the diaphragm 140 is bent toward the valve seat portion 116, To the valve seat portion 116 side. The opening amount of the differential pressure flow rate control valve 100 can be automatically adjusted according to the pressure difference between the hot water pressure supplied through the supply pipe of the hot water heating system and the hot water discharged through the water return pipe by the action of the diaphragm 140 .

The valve plug assembly 150 is operatively coupled to the valve housing 110 and is movable by the driving force of the valve actuator to open and close the valve orifice 117 inside the valve housing 110. The valve plug assembly 150 includes a valve plug 151, a plug stem 156 coupled with the valve plug 151, a plug support spring 158 for resiliently supporting the plug stem 156, And a movable support 162 connected thereto.

The valve plug 151 is for opening and closing the valve orifice 117 of the valve housing 110 and has an end facing the valve seat portion 116 and moving linearly in the valve guide passage 127. The valve orifice 117 is completely closed when the end of the valve plug 151 is brought into close contact with the valve seat portion 116 and the valve orifice 117 is closed when the valve plug 151 is separated from the valve seat portion 116 And the hot water can flow. That is, as the valve plug 151 moves away from the valve seat portion 116, the amount of opening of the differential pressure flow rate control valve 100 increases to increase the flow rate of hot water passing through the differential pressure flow rate control valve 100, The amount of opening of the differential pressure regulating valve 100 decreases and the flow rate of the hot water passing through the differential pressure regulating valve 100 decreases as the valve seat 151 approaches the valve seat portion 116.

As shown, the outer surface of the valve plug 151 may be coupled with an O-ring for sealing between the outer surface of the valve plug 151 and the inner surface of the valve housing extension 118. Closing operation of the valve plug 151 can be controlled by a valve actuator or can be automatically controlled by the difference between the pressure of the hot water supplied to the supply pipe and the pressure inside the valve housing 110.

The valve plug 151 is provided with a plug inlet port 152, a plug outlet port 153, and a plug flow path 154. The plug inlet 152 is provided at the end of the valve plug 151 so that hot water can be introduced and the plug outlet 153 is connected to the first chamber 134 of the differential pressure chamber 133 through the valve guide channel 127 And is provided on the side of the valve plug 151 to be connected. The plug flow passage 154 connects the plug inlet 152 and the plug outlet 153 on the inside of the valve plug 151. Hot water passing through the valve orifice 117 flows into the plug inlet 152 and flows into the first chamber 134 through the plug flow passage 154 and the plug outlet 153 and the valve guide passage 127 .

The plug stem 156 is disposed on the side of the second chamber 135 with respect to the diaphragm 140. One end of the plug stem 156 is inserted into the diaphragm through hole 141 of the diaphragm 140, . The plug stem 156 can be coupled with the valve plug 151 in a threaded manner as shown, or in various other ways.

The plug stem 156 is resiliently supported by a plug support spring 158. The plug support spring 158 is in contact with the valve plug 151 against the valve seat portion 116 in contact with the spring support member 160 whose one end is in contact with the inner surface of the movable support 162 and the other end is engaged with the end of the plug stem 156 The elastic force is applied in a direction away from the elastic member. The spring support member 160 can be coupled to the plug stem 156 in a threaded manner, as shown, or in various other ways. When the diaphragm 140 is elastically deformed by the pressure difference between the first chamber 134 and the second chamber 135 and the valve plug 151 and the plug stem 156 move toward the valve seat portion 116, The support spring 158 is elastically deformed. When the diaphragm 140 is restored to its original position, the valve plug 151 and the plug stem 156 are moved away from the valve seat portion 116 by the elastic force of the plug support spring 158.

The movable support 162 may be coupled with the valve actuator at one end so as to be provided with rotational force from the valve actuator. The movable support 162 includes a hollow support body 163 having a male thread 164 on its outer surface and a support cap 165 coupled to an open end of the support body 163.

A support chamber 166 is provided inside the support body 163 and a plug stem 156 and a plug support spring 158 and a spring support member 160 are accommodated in the support chamber 166. The other end of the support body 163 is disposed in the second chamber 135 so as to face the diaphragm 140. The other end of the support body 163 is opened to allow the plug stem 156 to pass through. The plug stem 156 can partially escape the support chamber 166 from the other end of the support body 163 when the diaphragm 140 is elastically deformed and the valve plug 151 is pressed. As shown, an O-ring is interposed between the inner surface of the diaphragm housing neck portion 136 and the outer surface of the support body 163 to seal them therebetween.

The support cap 165 may be rigidly coupled to one end of the support body 163 in a threaded manner as shown, or in various other ways. A support coupling groove 167 for coupling with the valve actuator may be provided at the center of the support cap 165. The support cap 165 may be fixed in various ways such as a bonding method using an adhesive body or a fixing method using a fixed key so as not to rotate relative to the support body 163 after being coupled to the support body 163. Therefore, when the rotational force of the valve actuator is transmitted to the support cap 165, the support body 163 and the support cap 165 can rotate together without relative rotation. As shown in the figure, an O-ring is interposed between the inner surface of the support body 163 and the outer surface of the support cap 165 to seal them therebetween.

The movable support 162 is screwed to the valve housing 110 by engaging a male screw thread 164 provided on the support body 163 with a female thread 137 provided on the diaphragm housing neck 136 . Therefore, when the driving force of the valve actuator is transmitted to the movable support 162, the movable support 162 can be moved in the direction to approach or depart from the valve seat portion 116 by screwing.

The movable support 162 is connected to the valve plug 151 in addition to the structure shown in the figure so that it can move the valve plug 151 by moving in a direction approaching or away from the valve seat portion 116 by receiving driving force from the valve actuator To a variety of other structures.

The auxiliary flow rate control unit 170 is installed inside the valve housing extension portion 118 to regulate the flow rate of the hot water through the connection flow passage 119 of the valve housing 110. The auxiliary flow rate control unit 170 includes a unit body 171, a unit cell 176, a unit head 178, a unit spring 183, and a unit cap 185.

The unit body 171 has a hollow cylindrical structure with both open ends and is provided in the connecting flow path 119. A unit body opening 172 is provided at one end of the unit body 171. The unit body opening 172 connects the valve inlet 113 and the connecting flow passage 119 and the unit head 178 is inserted into the unit body opening 172. The unit body 171 is provided with a unit body flow passage 173 through which the hot water flowing from the valve inlet opening 113 through the unit body opening 172 flows. A unit body passageway 174 for connecting the unit body passageway 173 and the valve orifice 117 is provided at the side of the unit body 171. The hot water passing through the unit body flow path 173 can flow to the valve orifice 117 through the unit body passage 174. [ The unit body passageway 174 extends in the direction in which the unit head 178 enters into the unit body 171 so that it can be obscured by the unit head 178 entering into the unit body 171. [ More specifically, the unit body passage 174 has a shape in which the width of the unit head 178 gradually decreases in a direction in which the unit head 178 enters into the unit body 171. Although the unit body passage 174 is shown as being formed in a triangular shape in the drawing, the shape of the unit body passage 174 may be variously changed.

The unit screening cell 176 is disposed outside the unit body 171 so as to surround the unit body 171. The unit screening cell 176 has a plurality of through holes through which hot water can pass. The unit filter network 176 filters the foreign substances in the hot water flowing through the unit body passage 174 to the valve orifice 117.

The unit head 178 is movably inserted into the unit body opening 172 so as to be pushed into the unit body 171 by the pressure of hot water flowing into the valve inlet 113. [ At the end of the unit head 178, a unit head engaging portion 179 having a width larger than the width of the unit body opening 172 is provided. The unit head 178 can be pushed into the unit body 171 for a certain distance but is not separated from the unit body 171 by engaging the unit head engaging portion 179 with the inner portion of the unit body 171. [ A unit head flow path 180 connected to the unit body flow path 173 of the unit body 171 is provided inside the unit head 178. A unit head passage 181 through which the hot water flowing into the valve inlet 113 flows is provided on the side of the unit head 178.

The auxiliary flow rate control unit 170 is installed in the connection passage 119 so that the unit body 171 is in close contact with the valve housing 110 and the unit head 178 is in close contact with the unit body 171. Therefore, The hot water passing through the unit head 178 can flow toward the connecting flow path 119 only through the unit head passage 181 of the unit head 178. The unit head passage 181 is formed so as to extend in the moving direction of the unit head 178. More specifically, the unit head passage 181 has a shape in which the width of the unit head 178 gradually increases in a direction in which the unit head 178 enters into the unit body 171. Although the figure shows that the unit head passage 181 has a triangular shape, the shape of the unit head passage 181 can be variously changed. The unit head 178 is resiliently supported by the unit spring 183.

The unit spring 183 is disposed inside the unit body 171 and applies an elastic force to the unit head 178 in a direction protruding from the unit body 171. One end of the unit spring 183 is in contact with the unit head 178 and the other end of the unit spring 183 is in contact with the unit cap 185. The unit spring 183 applies an elastic force to the unit head 178 so that the unit head 178 can be pushed back into the unit body 171 by the pressure of the hot water flowing into the valve inlet 113 and then returned to the original state .

The unit cap 185 is releasably coupled to the valve housing 110 so as to open and close the valve housing opening 120 of the valve housing 110. As shown, the unit cap 185 may be rigidly coupled to the valve housing 110 in a threaded manner or in various other manners, and may be configured to support the unit body 171 in close contact with the inner surface of the valve housing 110 The unit spring 183 can be supported. As shown in the figure, an O-ring is interposed between the valve housing 110 and the unit cap 185 to seal them therebetween. The unit cap 185 can be separated from the valve housing 110 to separate the auxiliary flow control unit 170 from the valve housing 110 as a whole. When the foreign matter filtered by the unit sieve filter 176 is accumulated in the connection passage 119, the unit cap 185 can be separated to open the valve housing opening 120 and remove foreign matter.

The auxiliary flow rate control unit 170 functions to regulate the flow rate of the hot water flowing into the valve inlet 113 and toward the valve orifice 117 and to stabilize the flow rate of the hot water.

The unit head 178 is pushed into the unit body 171 by the pressure of the incoming warm water when the relatively large amount of hot water flows through the valve inlet 113. [ As the unit head 178 is pushed into the unit body 171, the inflow area of the hot water through the unit head passage 181 is reduced, thereby reducing the flow rate of the hot water flowing into the unit body 171 do. In addition, when the unit head 178 is pushed into the unit body 171, the unit head 178 covers the unit body passage 174 of the unit body 171. Accordingly, the opening area of the unit body passage 174 is reduced, and the flow rate of the hot water flowing toward the valve orifice 117 through the unit body passage 174 also decreases. Further, the unit head passage 181 of the unit head 178 and the unit body passage 174 of the unit body 171 are formed in a triangular shape, so that the unit head 178 is moved in the unit body 171 according to the distance that the unit head 178 is pushed into the unit body 171 The hot water passage area of the unit head passage 181 or the unit body passage 174 is drastically reduced so that the flow rate of the hot water can be adjusted in inverse proportion to the difference of the hot water pressure difference between the valve inlet 113 side and the valve orifice 117 side Do.

In this way, when the flow rate of hot water flowing into the valve inlet 113 suddenly increases, the auxiliary flow rate control unit 170 buffers the rapidly increasing return water pressure, stabilizes the flow rate of the hot water, To flow toward the valve orifice 117 side. Therefore, the flow control function of the differential pressure flow control valve 100 can be performed more stably and the risk of damage or breakage of parts due to an abrupt return of hot water passing through the differential pressure flow control valve 100 is reduced.

Hereinafter, the operation and operation of the differential pressure control valve 100 according to an embodiment of the present invention will be described.

When the flow rate of the hot water flowing into the differential pressure flow rate control valve 100 increases sharply in the course of the hot water being discharged through the differential pressure flow rate control valve 100, the auxiliary flow rate control unit 170 rapidly increases the return water pressure So as to stabilize the flow rate of the hot water flowing toward the valve orifice 117 side.

On the other hand, the pressure of the hot water supplied to the supply pipe may increase due to a decrease in the number of heating zones where heating is performed in a state where the opening amount of the differential pressure flow control valve 100 is controlled by the valve actuator. At this time, the pressure of the second chamber 135 inside the diaphragm housing 130 connected to the supply pipe also increases through the bypass pipe 150. The pressure difference between the first chamber 134 and the second chamber 135 causes the pressure difference between the diaphragm 140 and the second chamber 135 to be greater than the pressure of the second chamber 135 when the pressure of the second chamber 135 is greater than the pressure of the first chamber 134 connected to the valve orifice 117. [ The valve plug 151 is moved to the valve seat portion 116 side. As the valve plug 151 approaches the valve seat portion 116, the opening amount of the internal flow path of the valve housing 110 decreases and the flow rate of the hot water passing through the valve housing 110 decreases, Thereby reducing the total flow rate. Therefore, the flow rate of the hot water in the hot water heating system can be stabilized.

As described above, the differential pressure flow rate control valve according to the embodiment of the present invention is simple in structure and excellent in durability, and can precisely and stably control the amount of opening of the internal flow passage through which hot water flows.

In addition, the differential pressure flow control valve according to the embodiment of the present invention can control the hot water to flow at a proper pressure and a proper flow rate even if the flow pressure of the hot water suddenly changes due to the change of the heating load or the flow resistance of the hot water.

Accordingly, it is possible to perform a stable heating operation as compared with the prior art, to reduce the damage or breakage of parts due to sudden pressure change of the hot water, and to further increase the heating efficiency.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be appreciated by those skilled in the art that many changes and modifications of the present invention are possible without departing from the spirit and scope of the appended claims.

100: differential pressure flow control valve 110: valve housing
111: base housing 116: valve seat portion
117: valve orifice 130: diaphragm housing
131: diaphragm housing base 132: diaphragm housing cover
133: Differential pressure chamber 134: First chamber
135: second chamber 140: diaphragm
150: valve plug assembly 151: valve plug
156: Plug stem 162: Operation support
170: auxiliary flow rate control unit 171: unit body
176: Unit filter net 178: Unit head
185: Unit cap

Claims (9)

A valve orifice for introducing hot water into the valve inlet and a valve outlet for discharging hot water to the other side and a valve orifice disposed between the valve inlet and the valve outlet for connecting the valve inlet and the valve outlet A valve housing including a valve seat portion and a connection passage connecting the valve inlet and the valve orifice;
A valve plug assembly including a valve plug movably disposed within the valve housing to open and close the valve orifice; And
And an auxiliary flow rate adjusting unit installed in the valve housing to adjust a flow rate of the hot water through the connection channel,
Wherein the auxiliary flow rate control unit comprises: a unit body having a unit body opening connecting the valve inlet and the connection passage, the unit body being disposed in the connection passage; A unit head movably disposed in the unit body opening so as to be pushed into the unit body by a pressure of hot water flowing into the valve inlet; A unit head passage extending in a moving direction of the unit head at a side of the unit head so that hot water flowing into the valve inlet can be introduced; And a unit spring disposed inside the unit body to apply an elastic force to the unit head in a direction protruding from the unit body.
The method according to claim 1,
Wherein the unit head passage has a shape in which the width of the unit head passage gradually increases in a direction in which the unit head enters the unit body.
The method according to claim 1,
A unit body passage through which the hot water flowing into the unit head passage flows is provided inside the unit body and a unit body passage connecting the unit body passage and the valve orifice is provided on the side of the unit body. Differential pressure control valve.
The method of claim 3,
Wherein the unit body passage extends in a direction in which the unit head enters into the unit body so as to be obscured by the unit head entering into the unit body.
5. The method of claim 4,
Wherein the unit body passage has a shape in which the width of the unit body passage gradually decreases in a direction in which the unit head enters the unit body.
The method of claim 3,
Wherein a unit filtering net is disposed between the valve orifice and the unit body to filter foreign substances in the hot water.
The method according to claim 1,
Wherein the valve housing is provided with a valve housing opening connected to the connection passage,
Wherein the auxiliary flow rate control unit includes a unit cap detachably coupled to the valve housing to support the unit body so as to open and close the valve housing opening.
The method according to claim 1,
A differential pressure chamber disposed inside the valve housing to be connected to the valve orifice;
And a second chamber communicating with the valve plug so that the valve plug can be elastically deformed by a pressure difference between the first chamber and the second chamber to move the valve plug, A diaphragm;
A plug channel provided inside the valve plug to connect the valve orifice and the first chamber; And
And a bypass passage provided in the valve housing to be connected to the second chamber to bypass hot water from the outside of the valve housing to the second chamber.
9. The method of claim 8,
The valve plug assembly comprising:
A movable support which is threadably movably coupled to the valve housing so as to elastically deform the diaphragm and has one end coupled to the valve actuator and the other end disposed in the second chamber so as to receive a rotational force from the valve actuator,
A plug stem movably disposed inside the movable support, the plug stem having one end penetrating a diaphragm through-hole provided in the diaphragm and coupled with the valve plug;
And a plug support spring disposed inside the movable support to elastically support the plug stem to apply an elastic force to the valve plug in a direction away from the valve seat portion.

Images