CN110925471A

CN110925471A - Low-temperature stop valve

Info

Publication number: CN110925471A
Application number: CN201911256061.3A
Authority: CN
Inventors: 郭世卫; 李金梁; 文国伍
Original assignee: Shanghai Tingben Fluid Control Co Ltd
Current assignee: Shanghai Tingben Fluid Control Co Ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-03-27

Abstract

The embodiment of the invention discloses a low-temperature stop valve. The low temperature stop valve of the present invention comprises: the valve comprises a valve body, a valve clack, a valve rod, a valve cover, a valve rod nut and a spring retainer ring; the valve body is provided with a hollow inner cavity, a feeding hole, a discharging hole and an adjusting hole; a blocking plate is arranged in the valve body and is provided with a through hole; the valve cover covers the adjusting hole, the valve cover is provided with an installation groove, and the side wall of the valve cover is provided with a spring clamping groove; the stem nut includes: a vertical portion and an eccentric portion; the vertical part and the eccentric part are eccentrically arranged, and the valve rod nut is arranged in the mounting groove, namely the valve rod nut cannot rotate in the mounting groove; the spring retainer ring is clamped in the spring clamp groove, so that the valve rod nut is fixed in the mounting groove; the valve rod penetrates through the valve rod nut and is in threaded connection with the valve rod nut; the valve clack is fixed on the valve rod. The low-temperature stop valve can replace the valve rod or the valve clack under the condition of only disassembling the valve cover, is convenient to maintain, occupies short time, does not need to reseal the valve body and the pipeline, and has good sealing effect.

Description

Low-temperature stop valve

Technical Field

The invention relates to the field of valves, in particular to a low-temperature stop valve.

Background

The stop valve is a valve with a valve clack moving along the central line of the valve body, and according to the moving form of the valve clack, the change of the valve body through a hole is in direct proportion to the stroke of the valve clack. The valve rod of the valve has relatively short opening or closing stroke and reliable cut-off function, and the valve body has proportional change of the valve rod through hole and the stroke of the valve clack, so that the valve is suitable for regulating flow. This type of valve is therefore very suitable for use as a shut-off or regulating valve and also for throttling. Low temperature shut-off valves are typically used in operating environments with temperatures below-40 ℃, such as: petrochemical, air separation, natural gas and other industries. Therefore, the low-temperature stop valve needs to achieve the effects of long working time and good sealing performance at the temperature suitable for the surrounding environment.

Low temperature shut-off valves can be generally classified into: the valve comprises a valve body, a valve clack, a valve rod nut and the like. At present low temperature stop valve when using generally the monolithic stationary on the pipeline, when needs maintenance or maintenance, need the low temperature stop valve of whole change, and need reseal between low temperature stop valve and the pipeline, required time is long, influences the availability factor, causes the wasting of resources to low temperature stop valve monolithic replacement.

Disclosure of Invention

The invention aims to provide a low-temperature stop valve, which can maintain or replace a valve rod or a valve clack without disassembling and disassembling a valve body through a detachable valve cover, saves time and has good sealing effect.

The embodiment of the invention provides a low-temperature stop valve which comprises a valve body, a valve clack, a valve rod, a valve cover, a valve rod nut and a spring retainer ring, wherein the valve clack is arranged on the valve body;

the valve body is provided with a hollow inner cavity, a feeding hole, a discharging hole and an adjusting hole, and the feeding hole, the discharging hole and the adjusting hole are respectively communicated with the hollow inner cavity;

a blocking plate is arranged in the valve body and is positioned between the feeding hole and the discharging hole, a through hole is formed in the blocking plate, and the through hole is positioned below the adjusting hole;

the valve gap lid closes on the regulation hole, the valve gap is equipped with the mounting groove, the mounting groove includes: the spring clamping groove is formed in the side wall of the eccentric section;

the vertical section and the eccentric section are both cylindrical and are eccentrically arranged;

the stem nut includes: a vertical portion and an eccentric portion;

the vertical part is positioned in the vertical section, and the eccentric part is positioned in the eccentric section;

the spring retainer ring is clamped in the spring clamp groove, one end of the eccentric part abuts against the upper wall of the eccentric section, and the other end of the eccentric part abuts against the spring retainer ring, so that the valve rod nut is fixed in the mounting groove;

the valve rod penetrates through the valve rod nut and is in threaded connection with the valve rod nut, so that the valve rod moves up and down relative to the valve rod nut when rotating;

the valve clack is fixed on the valve rod and used for plugging the through hole when the valve rod descends to a preset position.

In one possible solution, the flap comprises: a main body portion and a protruding portion located at a lower side of the main body portion;

the main body part is used for plugging the through hole when the valve rod descends to a preset position;

the valve clack sealing ring sealing device is characterized in that a valve clack sealing ring and a sealing ring pressing plate are arranged on the protruding portion in a penetrating mode, the sealing ring pressing plate is fixed to the protruding portion, and the sealing ring pressing plate is used for fixing the valve clack sealing ring.

In a possible scheme, the bottom of the valve rod is provided with a lug;

the main body part is provided with an annular bulge, the outer side wall of the annular bulge is not larger than the inner side wall of the adjusting hole, the annular bulge is provided with an opening, and the opening is used for allowing materials on the upper side of the valve clack to flow out;

the main body part is provided with a clamping groove, the clamping groove penetrates through the side wall of the main body part, and the clamping groove is used for clamping the bump;

the joint recess includes: the height of the lower groove part is equal to that of the bump.

In a possible solution, the top end of the protruding portion is dome-shaped, and a plurality of circular bosses are arranged on the bottom surface of the main body portion.

In one possible embodiment, the lower outer edge of the main body is tapered, and the through hole is tapered.

In a possible scheme, the blocking plate is arc-shaped, and the cross sections of the feeding hole, the discharging hole and the passing hole are equal.

In one possible solution, an elastic gasket is arranged between the valve cover and the valve body.

In one possible scheme, an elongated rod is fixed on the valve cover;

the slender rod is hollow, a convex ring is arranged in the slender rod, the slender rod is welded on the valve cover, and the valve rod penetrates through the convex ring and extends out of the slender rod;

the valve rod is sequentially sleeved with: the packing retaining ring, the packing pressing sleeve, the thrust ring, the pressure ring, the butterfly elastic washer and the bonnet nut;

the bottom of the packing retaining ring is abutted against the slender rod, and the packing retaining ring and the packing are positioned between the slender rod and the valve rod;

the bonnet nut is screwed on the slender rod, so that the packing retaining ring, the packing pressing sleeve, the thrust ring, the pressing ring, the butterfly-shaped elastic washer and the bonnet nut are mutually abutted.

In a possible scheme, the packing sets are arranged in multiple layers, and a blocking ring is arranged between every two layers of the packing sets;

the packing is made of polychlorotrifluoroethylene.

In one possible embodiment, the method further comprises: a hand wheel, a flat washer and a locking nut;

the hand wheel is sleeved at the top end of the valve rod, and the locking nut is screwed on the valve rod and fixes the hand wheel;

the flat washer is located between the locking nut and the hand wheel.

Based on the above scheme, the low-temperature stop valve of the invention comprises: valve body, valve clack, valve rod, valve gap, valve rod nut and circlip. The valve body cavity sets up, is equipped with feed inlet, discharge gate and regulation hole on the valve body, and feed inlet, discharge gate and regulation hole communicate with the cavity inner chamber respectively, and an organic whole is provided with the baffler in the valve body, and the baffler is located between feed inlet and the discharge gate, is equipped with the clearing hole on the baffler, and the clearing hole is located the regulation hole below. The valve gap lid closes on adjusting the hole, and the valve gap is equipped with the mounting groove, and the mounting groove includes: vertical section and eccentric section are equipped with spring clamp groove on the lateral wall of eccentric section, vertical section with eccentric section is cylindrical, just vertical section with eccentric section eccentric settings, vertical section and eccentric section disalignment setting promptly, and valve-stem nut's vertical position is in vertical section, and valve-stem nut's eccentric portion is located eccentric section to make eccentric nut fix in the mounting groove through the circlip, so valve-stem nut can not take place the rotation promptly and can not reciprocate again in the mounting groove. The valve rod penetrates through the valve rod nut and is in threaded connection with the valve rod nut, the valve clack is fixed on the valve rod, and the lower end of the valve clack abuts against the through hole and is used for plugging the through hole. Specifically, the low-temperature stop valve is arranged on a pipeline, the lower side of the valve clack is abutted against the through hole, the feeding hole is not communicated with the discharging hole, when the flow is required to be adjusted, the valve clack is driven to ascend by rotating the valve rod, the feeding hole is communicated with the discharging hole, and materials flow through the through hole from the feeding hole and flow out from the discharging hole; when the low-temperature stop valve needs to be closed, the valve rod is rotated reversely until the valve clack is abutted against the through hole. When the valve rod is rotated, the valve rod nut does not rotate, the valve rod nut can provide stable support for the valve cover, the sealing effect is good, and the valve rod adjusting efficiency is high. In addition, in the use, valve clack and valve rod are the wearing parts, when needs are maintained or are changed low temperature stop valve, need not to dismantle the valve body, can directly change valve clack or valve rod.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a low-temperature shutoff valve according to an embodiment of the present invention;

FIG. 2 is an enlarged view of the cryogenic stop valve of the embodiment of the present invention at A in FIG. 1;

FIG. 3 is a schematic cross-sectional view of a valve body according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a valve cover and elongated stem according to an embodiment of the present invention;

FIG. 5 is a schematic illustration of a stem nut according to an embodiment of the present invention;

FIG. 6 is a schematic sectional view of the valve flap according to an embodiment of the present invention.

Reference numbers in the figures:

1. a valve body; 2. an elastic washer; 3. a spring collar; 4. a seal ring pressing plate; 5. a valve clack sealing ring; 6. A valve flap; 7. a valve stem; 8. a valve cover; 9. a butterfly-shaped elastic washer; 10. pressing a ring; 11. packing; 12. a barrier ring; 13. a thrust ring; 14. packing pressing sleeve; 15. packing retainer ring; 16. a valve stem nut; 17. a screw; 18. a bonnet nut; 19. a hand wheel; 20. locking the nut; 21. a flat washer; 22. a feed inlet; 23. A discharge port; 24. an adjustment hole; 25. a hollow interior cavity; 26. a barrier plate; 27. mounting grooves; 28. a vertical section; 29. an eccentric section; 30. a spring clamp groove; 31. a vertical portion; 32. an eccentric portion; 33. a first lumen; 34. a second lumen; 35. a main body portion; 36. a projection; 37. a slender rod; 38. through the hole; 39. A convex ring; 40. a bump; 41. an annular projection; 42. an opening; 43. clamping the groove; 44. an upper groove part; 45. a lower groove part; 46. a circular boss.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the indicated orientations and positional relationships based on the drawings for convenience in describing and simplifying the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication connection; either directly or indirectly through intervening media, either internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 1 is a schematic sectional structure view of a low-temperature stop valve according to an embodiment of the present invention, fig. 2 is an enlarged view of a portion a in fig. 1 of the low-temperature stop valve according to the embodiment of the present invention, fig. 3 is a schematic sectional structure view of a valve body according to the embodiment of the present invention, fig. 4 is a schematic sectional structure view of a valve cover and an elongated rod according to the embodiment of the present invention, fig. 5 is a schematic sectional structure view of a valve stem nut according to the embodiment of the present invention, and fig.. As shown in fig. 1 to 6, the low-temperature stop valve of the present embodiment is made of low-temperature resistant alloy material, and can be applied in a working environment with a temperature lower than-40 ℃, for example: petrochemical, air separation, natural gas, and other industries, including: valve body, valve clack, valve rod, valve gap, valve-stem nut and circlip, the valve body is equipped with cavity inner chamber, feed inlet, discharge gate and regulation hole communicate with the cavity inner chamber respectively, are equipped with the baffler in the valve body, and the baffler is located between feed inlet and the discharge gate, and the baffler is equipped with the clearing hole, and the clearing hole is located the below of regulation hole, and the valve gap lid closes on the regulation hole, and the valve gap is equipped with the mounting groove, and the mounting groove includes: vertical section and eccentric section are equipped with spring slot on the lateral wall of eccentric section, and vertical section and eccentric section are cylindrical, and vertical section and eccentric section eccentric settings, and valve-stem nut includes: vertical portion and eccentric portion, vertical portion are located vertical section, eccentric portion is located eccentric section, the circlip card is established in spring clamp groove, eccentric portion one end supports the upper wall of holding at eccentric section, the eccentric portion other end supports with the circlip and holds, make valve-stem nut fix in the mounting groove, the valve rod passes valve-stem nut, and with valve-stem nut threaded connection, make the valve rod when rotatory, relative valve-stem nut reciprocates, the valve clack is fixed on the valve rod for shutoff clearing hole when the valve rod descends to preset position.

Specifically, in this embodiment, the valve body is fixed on the pipeline, and valve body 1 is equipped with cavity inner chamber 25, and feed inlet 22 is located the valve body 1 right side, and discharge gate 23 is located the valve body 1 left side and regulation hole 24 is located the valve body 1 upside, and feed inlet 22, discharge gate 23 and regulation hole 24 communicate with cavity inner chamber 25 respectively. The valve body 1 is internally and integrally provided with a blocking plate 26, the blocking plate 26 divides the hollow inner cavity 25 into a first inner cavity 33 and a second inner cavity 34, the feeding hole 22 is communicated with the first inner cavity 33, the discharging hole 23 is communicated with the second inner cavity 34, the blocking plate 26 is provided with a through hole 38, and the through hole 38 is positioned below the adjusting hole 24. Valve gap 8 passes through screw 17 to be fixed on the top lateral wall of regulation hole 24, and valve gap 8 lid closes regulation hole 24, sets up mounting groove 27 in the valve gap 8, and mounting groove 27 includes: the vertical section 28 and the eccentric section 29, the vertical section 28 and the eccentric section 29 are both cylindrical, the vertical section 28 and the eccentric section 29 are arranged eccentrically, and the side wall of the eccentric section 29 is provided with a spring clamping groove 30. The stem nut 16 includes: vertical portion 31 and eccentric portion 32, vertical portion 31 is located vertical section 28 and vertical portion 31 outline and vertical section 28's profile agrees with each other, eccentric portion 32 is located eccentric section 29 and agrees with each other, valve-stem nut 16 can not take place to rotate in mounting groove 27 promptly, 3 blocks of spring collar are established in spring collar 30, the one end of eccentric portion 32 supports and holds on eccentric section 29's last lateral wall, the other end and the 3 supports of spring collar of eccentric portion 32, and then make valve-stem nut 16 fix in mounting groove 27, spring collar 3 is the jump ring, the jump ring is the standard component, can purchase on the market. The valve rod nut 16 is provided with an internal thread penetrating through the vertical section 28 and the eccentric section 29, the internal thread and the valve rod 7 are coaxially arranged, the valve rod 7 is provided with an external thread, the valve rod 7 penetrates through the valve rod nut 16 and is in threaded connection with the valve rod nut 16, the upper end of the valve rod 7 extends out of the valve cover 8, and the valve rod 7 can move up and down relative to the valve rod nut 16 by rotating the upper end of the valve rod 7 when in use; the valve clack 6 is inserted into the lower end of the valve rod 7, and when the lower side of the valve clack 6 is abutted against the through hole 38, the valve clack 6 covers the through hole 38, and the first inner cavity 33 and the second inner cavity 34 are further separated.

It is not difficult to find that, when the low-temperature stop valve of the present invention is used, the valve body 1 may be firstly arranged on the pipeline, then the valve flap 6 is inserted at the lower end of the valve rod 7, then the valve rod nut 16 is arranged in the mounting groove 27 and is fixed by the spring retainer ring 3, then the valve rod 7 is screwed on the valve rod nut 16, and the upper end of the valve rod 7 extends out of the valve cover 8, finally the valve cover 8 is fixed on the valve body 1, when the valve flap 6 is initially abutted against the through hole 38, the valve flap 6 separates the first inner cavity 33 from the second inner cavity 34, and at this time, the flow rate is zero; when the flow needs to be adjusted, the valve rod 7 is rotated through a wrench or other tools to drive the valve clack 6 to ascend, the first inner cavity 33 is communicated with the second inner cavity 34, and materials in the pipeline flow out through the feeding hole 22, the through hole 38 and the discharging hole 23. The stem nut 16 is eccentrically disposed in the mounting groove 27, and the stem nut 16 is vertically restricted by the circlip 3, and the stem nut 16 eccentrically disposed does not rotate when the valve stem 7 is rotated. Because the valve rod nut 16 is matched with the mounting groove 27 and does not rotate, the possibility that materials flow out from the gap between the valve rod nut 16 and the mounting groove 27 is small, and the sealing effect is good. The valve cover 8 is fixed on the valve body 1 through the screw 17, and the valve rod 7 or the valve clack 6 can be replaced or maintained by disassembling the screw 17 and the valve cover 8 under the condition that the valve body 1 is not disassembled, so that the valve is convenient and quick.

Further, the valve flap 6 includes: the valve rod 7 descends to a preset position, the main body 35 is used for plugging the through hole 38, the protrusion 36 is provided with a valve clack sealing ring 5 and a sealing ring pressing plate 4, the valve clack sealing ring 5 penetrates through the protrusion 36, the sealing ring pressing plate 4 is fixed on the protrusion 36, and the sealing ring pressing plate 4 is used for the valve clack sealing ring 5. Specifically, in this embodiment, the valve flap 6 and the sealing ring pressing plate 4 are made of copper, the valve flap sealing ring 5 is made of plastic low temperature resistant material, the diameter of the valve flap sealing ring 5 is slightly larger than the minimum diameter of the through hole 38, the valve flap sealing ring 5 is inserted into the protruding portion 36, the sealing ring pressing plate 4 is riveted on the protruding portion 36, the valve flap sealing ring 5 is fixed on the protruding portion 36, and the situation that the material leaks from the gap between the valve flap sealing ring 5 and the valve flap 6 due to looseness of the sealing ring pressing plate 4 can be avoided by adopting a riveted fixing mode. When the valve rod 7 is rotated to drive the valve clack 6 to descend, the valve clack sealing ring 5 is firstly contacted with the side wall of the through hole 38, and the valve rod 7 is continuously rotated to drive the valve clack 6 to descend until the lower side of the valve clack 6 is abutted against the side wall of the through hole 38. The valve clack sealing ring 5 is extruded and deformed, and the sealing effect of the low-temperature stop valve when the low-temperature stop valve is closed can be improved. In the use, the condition that valve clack sealing washer 5 can have the loss needs to be changed regularly to the valve clack that is fixed with valve clack sealing washer 5 and sealing washer clamp plate 4 or together with the valve rod to the leakproofness of guarantee low temperature stop valve when using for a long time.

Further, the valve rod bottom is equipped with the lug, is equipped with cyclic annular arch on the main part, and cyclic annular bellied lateral wall is not more than the inside wall of regulation hole, and is equipped with the opening on the cyclic annular arch, and the opening is used for supplying the material of valve clack upside to flow, is equipped with the joint recess on the main part, and the joint recess runs through the lateral wall of main part, and the joint recess is used for the joint lug, and the joint recess includes: the height of the lower groove part is equal to that of the bump. Specifically speaking, in this embodiment, the bottom of the valve rod 7 is equipped with the lug 40, is equipped with annular protrusion 41 on the main body 35, and the lateral wall of annular protrusion 41 is not more than the inside wall of adjusting hole 24, and is equipped with opening 42 on the annular protrusion 41, and opening 42 is used for supplying the material outflow of the 6 upside of valve clack, is equipped with joint recess 43 on the main body 35, and joint recess 43 runs through the lateral wall of main body, and joint recess 43 is used for joint lug 41, and joint recess 43 includes: an upper groove portion 44 and a lower groove portion 45, the height of the lower groove portion 45 being equal to the height of the bump 40. As shown in fig. 6, in the low temperature stop valve of the present embodiment, the protrusion 40 is cylindrical, the protrusion 40 is disposed at the bottom of the valve rod 7, the diameter of the protrusion 40 is larger than the diameter of the valve rod 7 at the bottom, the valve flap 6 is provided with an annular protrusion 41 having an outer diameter equal to the inner diameter of the adjusting hole 24, the diameter of the main body 35 is equal to the diameter of the annular protrusion 41, and the annular protrusion 41 is provided with four openings 42 at equal intervals. The main body part is provided with a clamping groove 43, the clamping groove 43 penetrates through one side wall of the main body part, the upper groove part 44 and the lower groove part 45 are both in U shapes, the bottom arc of the U shape is concentric with the valve rod, the radius of the U-shaped arc of the upper groove part 44 is equal to the diameter of the valve rod 7 clamped in the upper groove part 44, the radius of the U-shaped arc of the lower groove part 45 is equal to the diameter of the convex block 40, the height of the lower groove part 45 is equal to the height of the convex block 40, after the convex block 40 is clamped in the lower groove part 45, the upper side and the lower side of the convex block 40 are abutted against the upper side wall and the lower side wall of the lower groove part 45, so that the valve clack 6 is fixed in the up and down direction relative to the valve rod 7, after the valve cover 8 with the valve rod 7 is fixed on the valve body 1, the valve rod 7 is adjusted, the valve clack 6 is abutted, the material retained in the space above the flap 6 can flow out through the opening 42. Since the diameter of the annular projection 41 of the valve flap 6 is equal to the inner diameter of the inner cavity of the adjustment opening 24, and part of the annular projection 41 is still located in the cavity of the adjustment opening 24 when the valve flap 6 abuts against the passage opening 38, the valve flap 6 will not move in other directions. Set up like this, the inside wall through joint recess 43 and regulation hole 24 makes valve clack 6 fix the downside at valve rod 7 with the mode of joint, need not use tools, simple to operate also only need dismantle lock nut 20 when maintaining the valve and can change valve clack 6 or valve rod 7 promptly, and labour saving and time saving.

Further, in the present embodiment, the tip of the protruding portion 36 is dome-shaped, and a plurality of annular bosses 46 are provided on the bottom surface of the main body portion 37. Specifically, in the present embodiment, the top end of the protruding portion 36 is dome-shaped, so that impurities in the material are not easily adhered to the protruding portion 36, and the degree of corrosion between the sealing ring pressing plate 4 and the protruding portion 36 can be reduced; six circular ring bosses 46 are arranged, when the valve clack sealing ring 5 is pressed on the valve clack 6, the valve clack sealing ring 5 and the six circular ring bosses 46 form a sealing labyrinth, and the possibility that materials will leak from the valve clack sealing ring 5 and the valve clack 6 is further reduced.

Further, the outer edge of the lower end of the body 35 is tapered, and the passage hole 38 is tapered. Specifically, in this embodiment, the lower end of the main body 35 extends to form an inwardly contracted conical surface, the conical surface of the through hole 38 is a conical surface gradually decreasing from top to bottom, when the valve rod 7 is rotated to drive the valve flap 6 to descend to a preset position, the valve flap seal ring 5 contacts with the through hole 38 first, a primary seal portion is formed, the valve rod 7 is rotated to enable the outer edge of the lower end of the main body 35 to abut against the conical surface of the through hole 38, secondary seal is formed, the sealing performance is reliable, the conical surface seal form has a function of pressing the lower edge, the sealing specific pressure is low, and in addition, impurities are not easily accumulated on the conical surface.

Further, the blocking plate 26 is arc-shaped, and the cross sections of the feed inlet 22, the discharge outlet 23 and the through hole 38 are equal. Specifically, in the present embodiment, the corners of the blocking plate 26 are formed in an arc shape, and the side walls of the valve body 1 on the lower side of the passage hole 38 are formed in an arc shape, so that the resistance to the flow of the material in the valve body 1 can be reduced. The cross sections of the feed inlet 22, the discharge outlet 23 and the through holes 38 are equal, so that the speed of the material flowing into the valve body 1 is equal to the speed of the material flowing out of the valve body 1, the pressure of the material on the barrier plate 26 in the using process is reduced, the flow resistance of the material is reduced, and the service life of the low-temperature stop valve is prolonged.

Furthermore, an elastic gasket 2 is arranged between the valve cover 8 and the valve body 1. Specifically, in this embodiment, the covering position of the valve cover 8 and the valve body 1 is set to be a step shape, the elastic washer 2 is set at the step position of the valve cover 8 and the valve body 1, and the elastic washer 2 is a standard washer and can be purchased in the market. When the valve is used, the elastic gasket 2 is placed at the step, the valve cover 8 and the valve body 1 are fixed through the screw 17, the elastic gasket 2 is arranged between the valve cover 8 and the valve body 1, the elastic gasket 2 is extruded and deformed to fill the uneven position of the surface between the valve cover 8 and the valve body 1, and the valve cover 8 and the valve body 1 are sealed. The valve cover 8 and the valve body 1 are fitted to each other at the step, and the valve cover 8 and the valve body 1 are sealed again.

Further, be fixed with elongate rod 37 on the valve gap 8, the inside cavity of elongate rod 37, and be equipped with bulge loop 39 in the elongate rod 37, elongate rod 37 welds on valve gap 8, and outside valve rod 7 passed bulge loop 39 and extended elongate rod 37, the cover was equipped with in proper order on valve rod 7: packing retaining ring 15, packing 11, packing pressure cover 14, thrust ring 13, clamping ring 10, butterfly spring washer 9 and bonnet nut 18, packing retaining ring 15 bottom and slender rod 37 support and hold, and packing retaining ring 15 and packing 11 are located between slender rod 37 and valve rod 7, and bonnet nut 18 closes on slender rod 37 soon, and above-mentioned packing retaining ring 15, packing 11, packing pressure cover 14, thrust ring 13, clamping ring 10, butterfly spring washer 9 and bonnet nut 18 support each other. Specific speaking, in this embodiment, the inside cavity of slender pole 37, the integrative setting of bulge loop 39 is on slender pole 37, be equipped with the through-hole on the bulge loop 39, this through-hole is passed to valve rod 7, and this through-hole size is unanimous with valve rod 7 size, the top surface of bulge loop 39 is the conical surface, set up slender pole 37 on valve gap 8 through friction weld's mode, and the top of valve rod 7 still stretches out slender pole 37 this moment, the length of valve rod 7 will be greater than valve gap 8 and slender pole 37 total length promptly, avoid the interior low temperature material of valve to produce the influence to upper portion packing 11, keep the leakproofness of packing 11, avoid the staff to be hindered by low temperature when rotating valve rod 7. The packing retaining ring 15, the packing 11, the packing pressing sleeve 14, the thrust ring 13, the pressing ring 10, the butterfly elastic washer 9 and the bonnet nut 18 are sequentially sleeved on the valve rod 7, and the bottom surface of the packing retaining ring 15 is abutted against the top surface of the convex ring 39 and is matched with the top surface of the convex ring. Packing retaining ring 15, packing 11 and packing press the downside part of cover 14 to be located the clearance of elongate rod 37 and valve rod 7, and packing retaining ring 15 and packing press the internal diameter of cover 14 to equal with the external diameter of valve rod 7, packing 11's external diameter is a bit bigger than the external diameter of valve rod 7, make packing 11 and valve rod 7 within a definite time form sealedly, packing 11's external diameter and packing press the external diameter of 14 downside parts to equal with elongate rod 37's internal diameter, packing retaining ring 15's external diameter is less than elongate rod 37's internal diameter, packing presses the upside part external diameter of cover 14 to be greater than elongate rod 37's internal diameter, can make packing press the upside part of cover 14 after 14 descends the certain degree to support with elongate rod 37's top surface and hold like this, avoid excessively squeezing packing 11, cause the damage. The top end of the thrust ring 13 is a conical surface, and the lower side of the press ring 10 is a conical surface matched with the conical surface of the thrust ring 13. The bonnet nut 18 is provided with internal threads and the elongated stem 37 is provided with external threads, the bonnet nut 18 being screwed onto the elongated stem 37. The packing retaining ring 15, the packing 11, the packing pressing sleeve 14, the thrust ring 13 and the pressing ring 10 are pressed tightly by the butterfly elastic washer 9, so that the packing 11 is in a sealing state, and the sealing effect of the low-temperature stop valve is improved. Because valve rod 7 is longer, and the inside cavity of slender pole 37, draw ratio is big, and the integrated into one piece processing degree of difficulty is big, and too big in the clearance between the internal diameter of avoiding slender pole 37 and valve rod 7's internal diameter, this scheme adopts 8 welding slender poles of valve gap's 37 form to replace the form of integrated into one piece processing, and easy processing, and slender pole 37 adopts seamless steel pipe to fix the stable in quality, convenient operation with friction weld's mode. It is worth mentioning that when the gap between the inner diameter of the elongated rod 37 and the inner diameter of the valve rod 7 is too large, the low-temperature material is easy to enter the cavity, so that the low-temperature material is heated and gasified, the pressure is rapidly increased, and the risk of explosion is generated. And because be provided with slender rod 37, make the length of valve rod 7 longer, the temperature of material is less to the temperature influence of packing 11, avoids the low temperature of material to destroy the sealed effect of packing 11.

Further, the packing 11 is arranged into a plurality of layers, a separation ring 12 is arranged between every two layers of packing 11, and the packing 11 is made of polychlorotrifluoroethylene materials. Specifically speaking, in this embodiment, separation ring 12 is the copper gasket, packing 11 adopts the polychlorotrifluoroethylene material can reduce packing 11's coefficient of friction, reduce valve rod 7's moment of torsion, compress tightly separation ring 12 and packing 11 through butterfly elastic washer 9, packing 11 pressurized deformation and valve rod 7 and slender rod 37 are sealed within a definite time, can further reduce the possibility that the material leaked from the clearance between valve rod 7 and the slender rod 37, and separation ring 12 sets up the multilayer with packing 11 interval, every layer of packing 11 pressurized deformation can both form the one deck sealed, multilayer packing 11 has formed the multilayer sealed, and multilayer packing 11's the mode of setting is compared in whole packing 11's mode of setting, packing 11 is less relatively with the area of contact of slender rod 37, further reduce valve rod 7's moment of torsion. The blocking ring 12 is a copper gasket, and is provided with a plurality of packing 11 at intervals, so that when the valve rod 7 is rotated, the valve rod 7 is more easily rotated than when the whole packing 11 is provided.

Further, the low temperature stop valve still includes: the valve rod 7 comprises a hand wheel 19, a flat washer 21 and a locking nut 20, wherein the hand wheel 19 is sleeved at the top end of the valve rod 7, the locking nut 20 is screwed on the valve rod 7 and fixes the hand wheel 19, and the flat washer 21 is positioned between the locking nut 20 and the hand wheel 19. Specifically, in this embodiment, the top end of the valve rod 7 is provided with a square conical surface portion and a threaded portion, the square conical surface portion gradually decreases from bottom to top, the hand wheel 19 is provided with a square conical surface fitted with the hand wheel 19, the flat washer 21 and the lock nut 20 are sequentially sleeved on the valve rod, and the lock nut 20 is engaged with the threaded portion of the valve rod 7 to screw the lock nut 20. Set up square conical surface portion, lock nut 20 takes place relative rotation when preventing to rotate hand wheel 19, and because valve rod 7 length is longer, so the material is less to the influence of hand wheel 19 temperature, and the staff can be directly adjust the flow of low temperature stop valve through rotating hand wheel 19, convenient and fast more.

In the present invention, unless otherwise explicitly specified or limited, the first feature "on" or "under" the second feature may be directly contacting the first feature and the second feature or indirectly contacting the first feature and the second feature through an intermediate.

Also, a first feature "on," "above," and "over" a second feature may mean that the first feature is directly above or obliquely above the second feature, or that only the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lower level than the second feature.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the corresponding technical solutions substantially depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cryogenic stop valve, comprising: the valve comprises a valve body, a valve clack, a valve rod, a valve cover, a valve rod nut and a spring retainer ring;

the stem nut includes: a vertical portion and an eccentric portion;

2. The cryogenic stop valve of claim 1, wherein the valve flap comprises: a main body portion and a protruding portion located at a lower side of the main body portion;

3. The cryogenic stop valve of claim 2, wherein a bump is provided at the bottom of the valve stem;

4. The low temperature stop valve of claim 3, wherein the tip of the protrusion is dome-shaped, and a plurality of annular bosses are provided on the bottom surface of the main body.

5. The cryogenic stop valve of claim 4, wherein the outer edge of the lower end of the main body portion is tapered, and the through hole is tapered.

6. The cryogenic stop valve of claim 5, wherein the baffle plate is arcuate, and the inlet port, the outlet port and the through hole are of equal cross-sectional area.

7. The low temperature stop valve of claim 6, wherein an elastic gasket is disposed between the bonnet and the valve body.

8. The cryogenic stop valve of claim 7, wherein an elongated stem is secured to the valve cover;

the bottom of the packing retaining ring is abutted against the upper surface of the convex ring, and the packing retaining ring and the packing are positioned between the slender rod and the valve rod;

9. The low-temperature stop valve according to claim 8, wherein the packing sets are arranged in multiple layers, and a blocking ring is arranged between each layer of the packing sets;

the packing is made of polychlorotrifluoroethylene.

10. The cryogenic stop valve of claim 9, further comprising: a hand wheel, a flat washer and a locking nut;

the flat washer is located between the locking nut and the hand wheel.