A rubber lined control valve

Abstract

The present invention relates to the field of valve technology, and in particular to a rubber lined control valve, comprising a valve body, a valve core and a control mechanism. The valve core comprises a valve plug sleeve, a first valve plug and a second valve plug; the control mechanism comprises a first valve stem, a second valve stem, a first transmission member and a second transmission member; the first valve plug and the second valve plug are sleeved in the valve plug sleeve; the first valve stem controls the movement of the first valve plug; the second valve stem controls the movement of the second valve plug; the alternating movement of the first valve plug and the second valve plug controls the opening and closing of the valve core, so that the first valve plug and the second valve plug are evenly worn and the service life is extended.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a rubber-lined control valve. Background Art

[0002] Control valves are widely used in the field of industrial automation control. They are control elements that change physical quantities such as medium flow, pressure, temperature, and liquid level. They generally include valve body, actuator, and accessories. The valve core is the component inside the valve body that changes the physical quantity of the fluid. The actuator drives the valve body according to the control signal. The accessories generate control signals for the control part.

[0003] Common rubber lined control valves are rubber lined on the basis of traditional valves to improve the performance and service life of the valve. Among them, cage valves have the best performance, but their valve cores are expensive. During the use of cage valves, the lower part of the valve plug in the valve core works at a higher frequency than the upper part of the valve plug, and the lower part of the valve plug is severely worn, and the entire valve plug needs to be replaced. Summary of the invention

[0004] Based on this, it is necessary to provide a rubber lined control valve to address the problems existing in the current cage control valve. The above purpose is achieved through the following technical solutions:

[0005] A rubber lined control valve comprises: a valve body, a valve core and a control mechanism;

[0006] The interior of the valve body is a cavity for installing the valve core;

[0007] The valve core comprises: a valve plug sleeve, a first valve plug and a second valve plug; the valve plug sleeve is located in the valve body cavity; a first material passage hole is arranged on the side wall of the valve plug sleeve; the first valve plug and the second valve plug are sleeved in the valve plug sleeve; the first valve plug is located above the second valve plug; the first valve plug and the second valve plug can move vertically relative to the valve plug sleeve; when the first valve plug and the second valve plug prevent the fluid from passing through the first material passage hole, the valve core is closed; when the first valve plug and the second valve plug allow the fluid to pass through the first material passage hole, the valve core is opened;

[0008] The control mechanism controls the first valve plug and the second valve plug to move vertically relative to the valve plug sleeve; the process in which the control mechanism controls the first valve plug and the second valve plug to move upward to realize opening and closing of the valve core is an upstroke; the process in which the control mechanism controls the first valve plug and the second valve plug to move downward to realize opening and closing of the valve core is a downstroke; the upstroke and the downstroke are performed alternately.

[0009] Optionally, the control mechanism includes: a first valve stem and a second valve stem; the first valve stem is used to drive the first valve plug to move up and down; the second valve stem is sleeved in the first valve stem; the second valve stem is used to drive the second valve plug to move up and down.

[0010] Optionally, the valve body includes: a valve seat and a valve cover; the cavity of the valve body is located in the valve seat; the valve seat is provided with a mounting port; the valve core passes through the mounting port and is fixed in the cavity of the valve body; the valve cover covers the mounting port and presses the valve plug sleeve; the valve seat is provided with a feed port and a discharge port; the feed port is connected to the first feed hole; the second feed hole is connected to the discharge port.

[0011] Optionally, a first sliding groove is provided on the upper portion of the inner wall of the valve plug sleeve, and a first sliding block is provided on the outer wall of the first valve plug. The first sliding block is slidably installed in the first sliding groove up and down, and the first sliding groove limits the rotation of the first valve plug relative to the valve plug sleeve; the first valve stem is threadedly engaged with the first valve plug; the rotation of the first valve stem drives the first valve plug to move up and down along the first sliding groove relative to the valve plug sleeve; a second sliding groove is provided on the lower portion of the valve plug sleeve, and the second sliding block is provided on the outer wall of the second valve plug. The second sliding block is slidably installed in the second sliding groove up and down, and the second sliding groove limits the rotation of the second valve plug relative to the valve plug sleeve; the second valve stem is threadedly engaged with the second valve plug; the rotation of the second valve stem drives the second valve plug to move up and down along the second sliding groove relative to the valve plug sleeve.

[0012] Optionally, the valve cover is provided with a stepped hole, and the first valve stem passes through the valve cover from the stepped hole; a first sealing member is provided on the table surface of the stepped hole; a pressure cover is provided above the first sealing member; the pressure cover covers the stepped hole; and the pressure cover presses the first sealing member.

[0013] Optionally, a second sealing member is provided between the valve plug sleeve and the valve cover; and a third sealing member is provided at the connection between the valve plug sleeve and the valve seat.

[0014] Optionally, a circular table is provided at the upper end of the valve plug sleeve; a second sealing member is provided on the upper end surface of the valve plug sleeve and the circular table, and is pressed by the valve cover for multi-stage sealing between the valve plug sleeve and the valve cover.

[0015] Optionally, fourth seals are provided at upper and lower ends of the outer side surface of the first valve plug; fourth seals are provided at upper and lower ends of the outer side surface of the second valve plug; and fifth seals are provided at the bottom surface of the first valve plug and the top surface of the second valve plug.

[0016] Optionally, a plurality of the first feed holes are evenly distributed on the side wall of the valve plug sleeve; the first feed holes are of equal size; a plurality of the second feed holes are evenly distributed on the second valve plug; and the second feed holes are of equal size.

[0017] Optionally, the rubber lined control valve is provided with a rubber lining, and the rubber lining includes a valve seat rubber lining; the valve seat rubber lining is located on the inner wall of the valve seat.

[0018] The beneficial effects of the present invention are as follows: by arranging a first valve plug controlled by a first valve stem and a second valve plug controlled by a second valve stem in a valve plug sleeve, a single stroke of upward movement of the first valve plug and the second valve plug can realize opening and closing of the valve core; a single stroke of downward movement can realize opening and closing of the valve core; by alternating upward stroke and downward stroke, the problem that the lower part of the valve plug of a traditional cage valve wears more than the upper part of the valve plug is solved, and the wear of the valve plug is uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 The figure is a schematic diagram of the overall structure of an embodiment of a rubber lined control valve of the present invention.

[0021] Figure 2 It is a left side view of an embodiment of the present invention.

[0022] Figure 3 for Figure 2 Cross-sectional view along AA.

[0023] Figure 4 for Figure 3 A partial enlarged view of the X in the middle.

[0024] Figure 5 for Figure 3 A partial enlarged view of the Y point in the middle.

[0025] Figure 6 for Figure 3 A partial enlarged view of the middle Z.

[0026] Figure 7 The figure is a top view of a valve seat of an embodiment of a rubber lined control valve of the present invention.

[0027] Figure 8 for Figure 7 Cross-sectional view along BB.

[0028] Fig. 9 The figure is a schematic structural diagram of a valve core of an embodiment of a rubber lined control valve of the present invention.

[0029] Fig.10 The figure is a bottom view of a valve core of an embodiment of a rubber lined control valve of the present invention.

[0030] Fig.11 for Fig.10 Cross-sectional view along CC.

[0031] Wherein: 100, valve body; 110, valve seat; 111, installation port; 112, feed port; 113, discharge port; 120, valve cover; 130, pressure cover; 200, valve core; 210, valve plug sleeve; 211, first feed hole; 212, first sliding groove; 213, second sliding groove; 220, first valve plug; 221, first slider; 230, second valve plug; 231, second feed hole; 232, second slider; 300, control mechanism; 310, first valve stem; 320, second valve stem; 410, first sealing member; 420, second sealing member; 430, third sealing member; 440, fourth sealing member; 450, fifth sealing member; 510, valve seat lining rubber. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] See also Figures 1 to 11 , an embodiment of a rubber lined control valve, the structure of which is specifically: a valve body 100, a valve core 200, and a control mechanism 300.

[0036] The interior of the valve body 100 is a cavity for installing the valve core 200 and for fluid to pass through.

[0037] The valve core 200 includes: a valve plug sleeve 210, a first valve plug 220 and a second valve plug 230; the valve plug sleeve 210 is a circular cylindrical structure; the valve plug sleeve 210 is located in the cavity of the valve body 100; the side wall of the valve plug sleeve 210 is provided with a first material passage hole 211; the first valve plug 220 and the second valve plug 230 are sleeved in the valve plug sleeve 210; the first valve plug 220 is located above the second valve plug 230; the first valve plug 220 and the second valve plug 230 can move vertically relative to the valve plug sleeve 210; the side wall of the valve plug sleeve 210, the first valve plug 220 and the second valve plug 230 have a stroke transition cavity ; The first valve plug 220 and the second valve plug 230 move up and down relative to the valve plug sleeve 210 to connect or isolate the first feed hole 211 with the transition chamber; the second feed hole 231 is vertically arranged on the bottom surface of the second valve plug 230, and the second feed hole 231 penetrates the second valve plug 230 and is connected with the transition chamber, and the fluid can always pass through the second feed hole 231; the first feed hole 211 is connected with the transition chamber, and when the fluid passes through the first feed hole 211, the valve core 200 is opened; the first feed hole 211 is isolated from the transition chamber, and when the fluid cannot pass through the first feed hole 211, the valve core 200 is closed.

[0038] The control mechanism 300 is connected to the first valve plug 220 and the second valve plug 230; the control mechanism 300 controls the first valve plug 220 and the second valve plug 230 to move vertically relative to the valve plug sleeve 210; the control mechanism 300 controls the first valve plug 220 and the second valve plug 230 to move upward to realize the process of opening and closing the valve core 200 is an upstroke; the control mechanism 300 controls the first valve plug 220 and the second valve plug 230 to move downward to realize the process of opening and closing the valve core 200 is a downstroke; the upstroke and the downstroke are performed alternately.

[0039] At the beginning of the upstroke, the second valve plug 230 is located at the bottom of the valve plug sleeve 210, and the first valve plug 220 is located above the second valve plug 230. The lower end of the first valve plug 220 is in close contact with the upper end of the second valve plug 230. The first valve plug 220 and the second valve plug 230 isolate the first feed hole 211 from the transition chamber, and the valve core 200 is closed.

[0040] During the upward stroke, the control mechanism 300 controls the first valve plug 220 to move upward, and at the same time controls the second valve plug 230 to be stationary relative to the valve plug sleeve 210, opening part of the first feed holes 211 on the side wall of the valve plug sleeve 210, so that part of the first feed holes 211 are connected with the transition chamber, and the valve core 200 is opened; when the second valve plug 230 is stationary at the bottom of the valve plug sleeve 210, the farther the first valve plug 220 moves upward, the greater the degree of opening of the valve core 200; the control mechanism 300 moves the first valve plug 220 to the top of the valve plug sleeve 210, and at the same time the second valve plug 230 is stationary at the bottom of the valve plug sleeve 210, so that all the first feed holes 211 are connected with the transition chamber, and the valve core 200 is fully opened. After the valve core 200 is opened, the control mechanism 300 controls the first valve plug 220 to be stationary, and the control mechanism 300 simultaneously controls the second valve plug 230 to move upward. The smaller the distance between the first valve plug 220 and the second valve plug 230 is, the smaller the opening degree of the valve core 200 is. If the control mechanism 300 controls the first valve plug 220 to contact the second valve plug 230, the first material passage hole 211 is isolated from the transition chamber, and the valve core 200 is closed.

[0041] When the upward stroke ends, the first valve plug 220 moves to the upper end of the valve plug sleeve 210 , and the upper end of the second valve plug 230 contacts the lower end of the first valve plug 220 , thereby blocking all the first material passage holes 211 .

[0042] At the beginning of the down stroke, the first valve plug 220 is located at the upper end of the valve plug sleeve 210, and the second valve plug 230 is located below the first valve plug 220. The lower end of the first valve plug 220 is in close contact with the upper end of the second valve plug 230. The first valve plug 220 and the second valve plug 230 isolate the first feed hole 211 from the transition chamber, and the valve core 200 is closed.

[0043] During the downstroke, the control mechanism 300 controls the first valve plug 220 to be stationary relative to the valve plug sleeve 210, and at the same time controls the second valve plug 230 to move downward, opening the first feed hole 211 on the side wall of the valve plug sleeve 210, so that the first feed hole 211 is connected with the transition chamber, and the valve core 200 is opened; when the first valve plug 220 is stationary at the top of the valve plug sleeve 210, the farther the second valve plug 230 moves downward, the greater the degree of opening of the valve core 200; the control mechanism 300 moves the second valve plug 230 to the bottom of the valve plug sleeve 210, and at the same time the first valve plug 220 is stationary at the top of the valve plug sleeve 210, so that all the first feed holes 211 are connected with the transition chamber, and the valve core 200 is fully opened. After the valve core 200 is opened, the control mechanism 300 controls the first valve plug 220 to move downward, and at the same time, the control mechanism 300 controls the second valve plug 230 to be stationary. The smaller the distance between the first valve plug 220 and the second valve plug 230, the smaller the opening degree of the valve core 200; if the control mechanism 300 controls the first valve plug 220 to contact the second valve plug 230, the first feed hole 211 is isolated from the transition chamber, and the valve core 200 is closed.

[0044] When the downward stroke ends, the second valve plug 230 moves to the lower end of the valve plug sleeve 210 , the lower end of the first valve plug 220 contacts the upper end of the second valve plug 230 , and all the first feed holes 211 are blocked.

[0045] In this embodiment, the control mechanism 300 includes: a first valve stem 310 and a second valve stem 320; the first valve stem 310 drives the first valve plug 220 to move up and down. The first valve stem 310 is hollow; the second valve stem 320 is sleeved in the first valve stem 310; the second valve stem 320 drives the second valve plug 230 to move up and down.

[0046] In this embodiment, the valve body 100 includes: a valve seat 110 and a valve cover 120; the cavity of the valve body 100 is located in the valve seat 110; the valve seat 110 is provided with a mounting port 111; the mounting port 111 is located above the cavity in the valve seat 110, and is connected to the cavity in the valve seat 110; an annular table is provided at the upper end of the mounting port 111, and an annular table is provided in the cavity in the valve seat 110; the valve core 200 passes through the mounting port 111, and is fixed in the cavity of the valve body 100 through the annular table of the mounting port 111 and the annular table of the cavity in the valve seat 110; the valve cover 120 covers the mounting port 111, and presses the valve plug sleeve 210. The valve seat 110 is provided with a feed port 112 and a discharge port 113; the feed port 112 is located on the right side of the cavity in the valve seat 110, and the discharge port 113 is located on the left side of the cavity in the valve seat 110; the feed port 112 is connected to the first feed hole 211, and the discharge port 113 is connected to the second feed hole 231; the axis of the feed port 112 is located above the axis of the discharge port 113.

[0047] In the present embodiment, a vertical first sliding groove 212 is provided on the upper portion of the inner wall of the valve plug sleeve 210, and the first sliding groove 212 is located above the first feed hole 211. A first sliding block 221 is provided on the outer wall of the first valve plug 220, and the first sliding block 221 is installed in the first sliding groove 212 for sliding up and down movement, and the first sliding groove 212 limits the rotation of the first valve plug 220 relative to the valve plug sleeve 210; the first valve stem 310 is threadedly engaged with the first valve plug 220; the rotation of the first valve stem 310 drives the first valve plug 220 to move up and down along the first sliding groove 212 relative to the valve plug sleeve 210; the first valve plug 220 moves up and down along the first sliding groove 212 relative to the valve plug sleeve 210, and the upper end surface of the first valve plug 220 is always in the first feed hole 211; a vertical second sliding groove 213 is provided at the lower part of the valve plug sleeve 210, and the second sliding groove 213 is located below the first feed hole 211, and a second sliding block 232 is provided on the outer wall of the second valve plug 230, and the second sliding block 232 is installed in the second sliding groove 213 for sliding up and down, and the second sliding groove 213 limits the rotation of the second valve plug 230 relative to the valve plug sleeve 210; the second valve stem 320 is threadedly matched with the second valve plug 230; the rotation of the second valve stem 320 drives the second valve plug 230 to move up and down along the second sliding groove 213 relative to the valve plug sleeve 210; the second valve plug 230 moves up and down along the second sliding groove 213 relative to the valve plug sleeve 210, and the lower end surface of the second valve plug 230 is always below the first feed hole 211.

[0048] In this embodiment, a stepped hole is provided in the valve cover 120, and the first valve stem 310 passes through the valve cover 120 from the stepped hole; a first sealing member 410 is provided on the table surface of the stepped hole; a pressure cover 130 is provided above the first sealing member 410, and the pressure cover 130 presses the first sealing member 410; the pressure cover 130 is fixed on the top of the valve cover 120 to prevent the fluid from leaking from the connection between the first valve stem 310 and the valve cover 120 when the first valve stem 310 controls the movement of the first valve plug 220.

[0049] In this embodiment, the valve cover 120 is provided with a stepped hole, and the first valve stem 310 passes through the valve cover 120 from the stepped hole; a first sealing member 410 is provided on the stepped hole table; a pressure cover 130 is provided above the first sealing member 410, and the pressure cover 130 covers the stepped hole; the pressure cover 130 presses the first sealing member 410.

[0050] In this embodiment, a second sealing member 420 is provided between the valve plug sleeve 210 and the valve cover 120 to prevent fluid leakage from the connection between the valve seat 110 and the valve cover 120; a third sealing member 430 is provided at the connection between the valve plug sleeve 210 and the valve seat 110 to prevent fluid leakage from the connection between the valve seat 110 and the valve plug sleeve 210; since the valve cover 120 presses the valve plug sleeve 210 and the second sealing member 420, the valve plug sleeve 210 further presses the third sealing member 430 to improve the sealing performance of the valve seat 110. Fourth sealing members 440 are provided at the upper and lower ends of the outer side surface of the first valve plug 220 to prevent fluid leakage when the valve core 200 is closed; fourth sealing members 440 are provided at the upper and lower ends of the outer side surface of the second valve plug 230.

[0051] In this embodiment, a circular table is provided at the upper end of the valve plug sleeve 210; a second sealing member 420 is provided on both the upper end surface and the circular table of the valve plug sleeve 210 and is pressed by the valve cover 120 for multi-stage sealing between the valve plug sleeve 210 and the valve cover 120.

[0052] In this embodiment, a fourth seal 440 is provided at the upper and lower ends of the outer side of the first valve plug 220 ; a fourth seal 440 is provided at the upper and lower ends of the outer side of the second valve plug 230 ; a fifth seal 450 is provided on the bottom surface of the first valve plug 220 and the top of the second valve plug 230 .

[0053] In this embodiment, a plurality of first feed holes 211 are evenly distributed on the side wall of the valve plug sleeve 210 ; the first feed holes 211 are of equal size; the second feed holes 231 are evenly distributed on the second valve plug 230 ; the second feed holes 231 are of equal size.

[0054] In this embodiment, the rubber lined control valve is provided with a rubber lining, including a valve seat rubber lining 510 on the inner wall of the valve seat 110 , to improve the sealing and corrosion resistance of the valve seat 110 .

[0055] The specific working process of the rubber lined control valve is as follows:

[0056] The initial state of the rubber lined control valve is as follows: the second valve plug 230 is located at the bottom of the valve plug sleeve 210, the first valve plug 220 is located above the second valve plug 230, the lower end of the first valve plug 220 contacts the upper end of the second valve plug 230, and squeezes the fifth sealing member 450, the fifth sealing member 450 is deformed under pressure, and prevents the fluid from leaking from the contact surface of the first valve plug 220 and the second valve plug 230 when the valve core 200 is closed. The first valve plug 220 and the second valve plug 230 isolate the first feed hole 211 from the transition chamber, and the valve core 200 is in a closed state.

[0057] The fluid flows into the cavity in the valve seat 110 through the feed port 112 . At this time, the valve core 200 is in a closed state and the fluid cannot pass through.

[0058] During the upward stroke, the first valve stem 310 is rotated clockwise, and the first valve stem 310 interacts with the first valve plug 220 through the threaded connection, driving the first valve plug 220 to move upward relative to the valve plug sleeve 210, partially connecting the first feed hole 211 with the transition chamber, so that the fluid can enter the transition chamber through part of the first feed hole 211, and the valve core 200 is opened.

[0059] At this time, the fluid first flows into the cavity in the valve seat 110 through the feed port 112 , then enters the transition cavity from the first feed hole 211 , flows out from the second feed hole 231 , and finally flows out of the cavity of the valve seat 110 from the discharge port 113 .

[0060] In the upward stroke, after the valve core 200 is opened, the larger the distance between the first valve plug 220 and the second valve plug 230, the more first material holes 211 are opened, and the greater the opening degree of the valve core 200; on the contrary, the opening degree of the valve core 200 becomes smaller, and the distance between the first valve plug 220 and the second valve plug 230 is zero, that is, the lower end of the first valve plug 220 contacts the upper end of the second valve plug 230 and blocks all the first material holes 211, so that all the first material holes 211 are isolated from the transition chamber, and the valve core 200 is closed. The first valve stem 310 is rotated clockwise to move the first valve plug 220 to the top of the valve plug sleeve 210, while keeping the second valve plug 230 at the bottom of the valve plug sleeve 210, so that the fluid can pass through all the first material holes 211, so that all the first material holes 211 are connected to the transition chamber, and the valve core 200 is fully opened. When the first valve plug 220 moves to the top of the valve plug sleeve 210, the upper end of the second valve plug 230 contacts the lower end of the first valve plug 220 and presses the fifth sealing member 450, blocking all the first feed holes 211, and the valve core 200 is closed, and the upward stroke ends.

[0061] At this time, the first valve plug 220 is located at the top of the valve plug sleeve 210, and the lower surface of the first valve plug 220 contacts the upper surface of the second valve plug 230 and presses the fifth seal 450; the first valve plug 220 and the second valve plug 230 isolate all the first feed holes 211 from the transition chamber, and the valve core 200 is in a closed state.

[0062] During the downward stroke, the second valve stem 320 is rotated counterclockwise, and the second valve stem 320 interacts with the second valve plug 230 through the threaded connection, driving the second valve plug 230 to move downward relative to the valve plug sleeve 210, so that part of the first feed hole 211 is connected to the transition chamber, and the fluid can pass through part of the first feed hole 211, and the valve core 200 is opened.

[0063] At this time, the fluid first flows into the cavity in the valve seat 110 through the feed port 112 , then enters the transition cavity from the first feed hole 211 , flows out of the transition cavity from the second feed hole 231 , and finally flows out of the cavity of the valve seat 110 from the discharge port 113 .

[0064] In the downstroke, after the valve core 200 is opened, the larger the distance between the first valve plug 220 and the second valve plug 230, the more first feed holes 211 are opened, and the greater the opening degree of the valve core 200; conversely, the opening degree of the valve core 200 becomes smaller, and the distance between the first valve plug 220 and the second valve plug 230 is zero, that is, the lower end of the first valve plug 220 contacts the upper end of the second valve plug 230 and blocks all the first feed holes 211, so that the first feed holes 211 are isolated from the transition chamber, and the valve core 200 is closed.

[0065] The second valve stem 320 is rotated counterclockwise to move the second valve plug 230 to the bottom of the valve plug sleeve 210, while the first valve plug 220 is kept at the top of the valve plug sleeve 210, so that the fluid can pass through all the first material holes 211, so that all the first material holes 211 are connected with the transition chamber, and the valve core 200 is fully opened. When the second valve plug 230 moves to the bottom of the valve plug sleeve 210, the upper end of the second valve plug 230 contacts the lower end of the first valve plug 220 and presses the fifth sealing member 450, blocking all the first material holes 211, isolating the first material holes 211 from the transition chamber, and the valve core 200 is closed, and the downstroke ends.

[0066] At this time, the rubber lined control valve returns to the state before the start of the upstroke, realizing the change of the physical quantity of the control fluid and repeating the above process.

[0067] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A rubber lined control valve, characterized in that: include: Valve body, valve core and control mechanism; The interior of the valve body is a cavity for installing the valve core; The valve core comprises: a valve plug sleeve, a first valve plug and a second valve plug; the valve plug sleeve is located in the valve body cavity; a first material passing hole is arranged on the side wall of the valve plug sleeve, and a second material passing hole is arranged on the bottom surface of the second valve plug in the vertical direction; the first valve plug and the second valve plug are sleeved in the valve plug sleeve; the first valve plug is located above the second valve plug; the first valve plug and the second valve plug can move vertically relative to the valve plug sleeve; when the first valve plug and the second valve plug prevent the fluid from passing through the first material passing hole, the valve core is closed; when the first valve plug and the second valve plug allow the fluid to pass through the first material passing hole, the valve core is opened; The control mechanism controls the first valve plug and the second valve plug to move vertically relative to the valve plug sleeve; the process in which the control mechanism controls the first valve plug and the second valve plug to move upward to realize the opening and closing of the valve core is an upstroke; the process in which the control mechanism controls the first valve plug and the second valve plug to move downward to realize the opening and closing of the valve core is a downstroke; the upstroke and the downstroke are performed alternately; The control mechanism comprises: a first valve stem and a second valve stem; the first valve stem is used to drive the first valve plug to move up and down; the second valve stem is sleeved in the first valve stem; the second valve stem is used to drive the second valve plug to move up and down.

2. A rubber lined control valve according to claim 1, characterized in that: The valve body comprises: a valve seat and a valve cover; the cavity of the valve body is located in the valve seat; the valve seat is provided with a mounting port; the valve core passes through the mounting port and is fixed in the cavity of the valve body; the valve cover covers the mounting port and presses the valve plug sleeve; the valve seat is provided with a feed port and a discharge port; the feed port is communicated with the first feed hole; the second feed hole is communicated with the discharge port.

3. A rubber lined control valve according to claim 1, characterized in that: A first sliding groove is provided on the upper part of the inner wall of the valve plug sleeve, and a first sliding block is provided on the outer wall of the first valve plug. The first sliding block is slidably installed in the first sliding groove up and down, and the first sliding groove limits the rotation of the first valve plug relative to the valve plug sleeve; the first valve stem is threadedly engaged with the first valve plug; the rotation of the first valve stem drives the first valve plug to move up and down along the first sliding groove relative to the valve plug sleeve; a second sliding groove is provided on the lower part of the valve plug sleeve, and a second sliding block is provided on the outer wall of the second valve plug. The second sliding block is slidably installed in the second sliding groove up and down, and the second sliding groove limits the rotation of the second valve plug relative to the valve plug sleeve; the second valve stem is threadedly engaged with the second valve plug; the rotation of the second valve stem drives the second valve plug to move up and down along the second sliding groove relative to the valve plug sleeve.

4. A rubber lined control valve according to claim 2, characterized in that: The valve cover is provided with a stepped hole, and the first valve stem passes through the valve cover from the stepped hole; a first sealing member is provided on the table surface of the stepped hole; a pressure cover is provided above the first sealing member; the pressure cover covers the stepped hole; and the pressure cover presses the first sealing member.

5. A rubber lined control valve according to claim 2, characterized in that: A second sealing member is arranged between the valve plug sleeve and the valve cover; and a third sealing member is arranged at the connection between the valve plug sleeve and the valve seat.

6. A rubber lined control valve according to claim 5, characterized in that: A circular table is arranged at the upper end of the valve plug sleeve; a second sealing member is arranged on the upper end surface of the valve plug sleeve and the circular table, and is pressed by the valve cover for multi-stage sealing between the valve plug sleeve and the valve cover.

7. The rubber lined control valve according to claim 1, characterized in that: A fourth sealing member is disposed at the upper and lower ends of the outer side surface of the first valve plug; a fourth sealing member is disposed at the upper and lower ends of the outer side surface of the second valve plug; and a fifth sealing member is disposed on the bottom surface of the first valve plug and the top surface of the second valve plug.

8. The rubber lined control valve according to claim 1, characterized in that: A number of the first feed holes are evenly distributed on the side wall of the valve plug sleeve; the first feed holes are of equal size; a number of the second feed holes are evenly distributed on the second valve plug; the second feed holes are of equal size.

9. The rubber lined control valve according to claim 1, characterized in that: The rubber lined control valve is provided with a rubber lining, and the rubber lining includes a valve seat rubber lining; the valve seat rubber lining is located on the inner wall of the valve seat.

Images