CN203628013U - Copious cooling butterfly valve with composite cooling disc valve cover - Google Patents

Abstract

A cryogenic butterfly valve with a compound cooling disc bonnet, which includes a valve body in which a butterfly plate assembly and an axial floating seat assembly are arranged, the butterfly plate assembly and the axial floating seat assembly form a sealing structure, the valve The rod passes through the butterfly plate assembly and is fixed with the butterfly plate assembly, and passes through the upper and lower shaft holes of the valve body, then passes through the bonnet upwards, and cooperates with the graphite packing layer in the sealing box on the upper part of the bonnet, extending upwards Pass through the bracket and enter the actuator assembly above the bracket, and the actuator assembly rotates 90° to drive the butterfly plate assembly to move. Because the utility model adopts the idea of improving the temperature conductivity λ, increasing the convective temperature dissipation area A between the valve cover and the surrounding environment, and the temperature difference ΔT between the convective dissipation temperature with the surrounding environment, the designed valve cover has a single large-diameter diffuser outside. The composite heat dissipation plate structure composed of the temperature plate and the multi-circle small-diameter heat dissipation plate at the top has achieved an excellent heat dissipation effect.

Description

Cryogenic Butterfly Valve with Composite Dispersion Disc Bonnet

technical field

The utility model relates to a cryogenic butterfly valve, in particular to a cryogenic top-mounted butterfly valve with a composite temperature-dissipating disc valve cover. the

Background technique

In the automatic control of the process of the modern liquefied natural gas, liquid oxygen, liquid hydrogen, liquid helium, etc. -150 ℃ to -250 ℃ cryogenic system process, the cryogenic top-mounted butterfly valve plays a very important role, and can be maintained online . In this process control, it is necessary to adjust and open and close the circulation parameters of the medium according to the real-time data signal. The sensitivity and reliability of its control action, the sealing performance and life between the valve stem and packing are very important. Because the lower part of the valve stem in the bonnet of the cryogenic top-entry butterfly valve is connected with the butterfly plate, and the upper part is flexibly matched with the graphite packing in the sealing box, and then connected with the actuator. The cryogenic medium in the bonnet space is connected with the valve body. In the same way, the structure of the valve cover must have a good heat dissipation effect to ensure that the temperature at the joint between the valve stem and the bottom of the graphite packing is above 0°C, so as to avoid freezing and bonding due to the moisture in the air, so as to ensure the valve’s stability. Reliable effect of adjustment and opening and closing actions. Therefore, the heat dissipation performance of the valve cover directly affects the safety, reliability and economic benefits of the system. However, in the existing technology, the bonnet of the cryogenic top-mounted butterfly valve adopts a single large-diameter cooling plate and an extended bonnet top to dissipate temperature, but the radius of the single cooling plate increases, and the closer to the periphery, the cryogenic medium The smaller the temperature difference between the cold temperature transmitted by the base surface and the convection of the environment, that is to say, the average temperature conductivity is reduced, the cooling conditions are not sufficient, and the effect is poor; it is necessary to extend the top of the valve cover, but the cold temperature of the peripheral wall of the top is extended The area for heat dissipation and convection with the environment is small, and the heat dissipation conditions are not good enough, which will reduce the strength of the valve cover and increase the cost. Insufficient cooling conditions will cause the sliding joint between the valve stem and the packing to freeze and stick, the opening and closing action torque is large or cannot be moved, and the frozen hard objects scratch the valve stem and packing. The service life of the cryogenic butterfly valve is short and the replacement is frequent. the

In addition, the sealing pair of the inner part of the butterfly valve needs to be replaced after it wears out and loses its sealing function. Since the processing size of the new replacement part will always be different from the original part, it is difficult to adjust the sealing specific pressure after replacement, and the sealing specific pressure may be insufficient or even unable to seal. Will cause leakage. the

Contents of the invention

The utility model provides a deep-cooled butterfly valve with a composite temperature-dissipating plate valve cover, which adopts the idea of increasing the temperature conductivity λ, increasing the convective temperature dissipation area A between the valve cover and the surrounding environment, and the convective temperature difference ΔT with the surrounding environment. , the outside of the designed valve cover has a composite cooling disc structure composed of a single large-diameter cooling disc and multiple small-diameter cooling discs on the top, which achieves an excellent cooling effect and ensures that the valve stem and the bottom of the packing are The temperature of the matching place is above 0°C, which prevents the moisture in the solid air from freezing and sticking, and ensures the reliable opening and closing of the valve, the safety and reliability of the system and the improvement of economic benefits. the

A cryogenic butterfly valve with a compound cooling disc bonnet, which includes a valve body in which a butterfly plate assembly and an axial floating seat assembly are arranged, the butterfly plate assembly and the axial floating seat assembly form a sealing structure, the valve The rod passes through the butterfly plate assembly and is fixed with the butterfly plate assembly, and passes through the upper and lower shaft holes of the valve body, and then passes through the bonnet upwards, cooperates with the graphite packing layer in the sealing box on the upper part of the bonnet, and extends upwards Pass through the bracket and enter the actuator assembly above the bracket, the actuator assembly rotates 90° to drive the butterfly plate assembly to move; the graphite filler is provided with a packing gland, and the packing gland is provided with a packing gland, and the packing gland It is fixedly connected with the valve cover; the valve cover is equipped with a composite heat dissipation plate composed of a single large-diameter heat dissipation plate and a multi-circle small-diameter heat dissipation plate on the top. the

The above-mentioned butterfly plate assembly includes a butterfly plate, a composite multi-layer sealing ring, a pressure ring, an inner elastic washer and a hexagonal screw arranged sequentially from right to left. The composite multi-layer sealing ring has a radial elastic fine-tuning function when it is closed with the valve seat, so that The sealing pair maintains a tight sealing effect. the

The above-mentioned valve seat assembly includes a valve seat, a sealing ring, an adjustment ring, a steel wire retaining ring for the hole, a bolt with a hole in the head of the hexagon head, a stop wire, a limit block, a double ear washer, a hexagon bolt, and a hexagon bolt on the adjustment ring. The sealing specific pressure of each point of the sealing secondary circle can be adjusted; the limit block, double ear washer and hexagonal bolt can limit the movement of the valve seat in the upstream direction. the

The above-mentioned packing gland and the valve cover are fixedly connected by stud bolts and hexagon nuts, and disc springs are arranged between the hexagon nuts and the packing gland. the

The above-mentioned valve body is provided with a maintenance window, and the maintenance window is provided with a window cover, and the window cover and the valve body are connected by stud bolts and hex nuts, and a first metal wound gasket is provided between the two. the

The above-mentioned valve stem is connected with the actuator assembly through a flat key, and the actuator is a manual, electric or pneumatic actuator. the

The upper and lower shaft holes of the above-mentioned valve body are respectively provided with an upper shaft sleeve and a lower shaft sleeve outside the valve stem. the

The above-mentioned valve body and valve cover are fixedly connected by hex nuts and studs, and a second metal wound gasket is arranged between them. the

A packing gasket is provided between the graphite packing layer and the packing gland, and an O-ring is provided between the packing gland and the valve cover. the

The utility model has achieved the following technical effects:

1. Due to the idea of improving the temperature conductivity λ, increasing the convective temperature dissipation area A between the bonnet and the surrounding environment, and the convective temperature difference ΔT between the bonnet and the surrounding environment, the utility model is designed with a single-piece large The structure of the composite heat dissipation plate composed of the diameter heat dissipation plate and the multi-circle small diameter heat dissipation plate at the top achieves an excellent heat dissipation effect and ensures that the temperature at the joint between the valve stem and the bottom of the packing is above 0°C and prevents lingering Freeze and stick due to the moisture in the air, ensuring the reliable opening and closing of the valve, the safety and reliability of the system and the improvement of economic benefits;

2. Due to the sufficient cooling conditions, the utility model prevents hard objects from freezing and scratching the valve stem and packing, so that it maintains the sealing performance and has a long service life, thus prolonging the service life of the cryogenic gate valve and reducing the maintenance of the working condition system. cost;

3. The utility model does not need to lengthen the length of the top of the valve cover excessively due to sufficient cooling conditions, which increases the overall strength of the valve cover and the valve, and reduces the manufacturing cost of the valve at the same time.

4. The utility model adopts the detachable structural form of the butterfly plate assembly, which is convenient for maintenance and replacement of seals. the

5. Since the utility model adopts the butterfly plate assembly and is equipped with a composite multi-layer sealing ring, it has a radial elastic fine-tuning function when it is closed with the valve seat, so that the sealing pair maintains a tight sealing effect. the

6. Since the utility model adopts the axial floating structure of the valve seat, it can withstand the reverse instant water hammer impact pressure, and the displacement of the butterfly plate can be automatically compensated and adjusted, so that the valve seat and the composite multi-layer sealing ring can bear two-way pressure and maintain a tight fit. the

7. Since the utility model adopts the detachable structure of the valve seat assembly, the processing size of the valve seat and the composite multi-layer sealing ring has a wide adaptability margin and strong interchangeability. It can be conveniently adjusted in both installation and maintenance. the

8. The utility model adopts a valve body with a maintenance window and a window cover, which can facilitate installation and online maintenance. the

9. In this utility model, because the upper part of the cover sealing box is provided with packing gland fasteners, there is a disc spring elastically compressing the graphite packing in it, so that it can flexibly slide and cooperate with the valve stem without causing relaxation due to temperature changes. leakage. the

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described. the

Fig. 1 is the structural representation of the utility model;

FIG. 2 is a partially enlarged view of FIG. 1 .

P in the figure represents the mainstream direction. the

Detailed ways

As shown in attached drawings 1-2, a cryogenic butterfly valve with a compound cooling disc bonnet includes a valve body 1, a butterfly plate assembly and an axial floating seat assembly are arranged in the valve body, and the butterfly plate assembly and the axial The floating valve seat assembly forms a sealing structure. The valve stem 26 passes through the butterfly plate assembly and is fixed with the butterfly plate assembly, and passes through the upper and lower shaft holes of the valve body, and then passes through the valve cover 23 upwards, and is sealed with the upper part of the valve cover. The graphite filler layer 41 in the middle extends out in cooperation, and extends upwards through the bracket 29 to enter the actuator assembly 33 above the bracket. The actuator assembly makes a 90° rotation to drive the butterfly plate assembly to move; above the graphite filler is provided with a packing pressure Sleeve 38, a packing gland 37 is arranged on the packing gland, and the packing gland is fixedly connected with the bonnet; the outside of the bonnet is provided with a single large-diameter cooling disc 24 and the top is provided with a multi-circle small-diameter cooling The composite cooling disc that disc 25 forms. the

Preferably, the butterfly plate assembly includes a butterfly plate 10, a composite multi-layer sealing ring 11, a pressure ring 18, an inner elastic washer 17 and a hexagonal screw 16 arranged in order from right to left, and the composite multi-layer sealing ring is closed with the valve seat It has a radial elastic fine-tuning function, so that the sealing pair can maintain a tight sealing effect. The valve seat assembly includes a valve seat 8, a sealing ring 9, an adjustment ring 12, a steel wire retaining ring 13 for the hole, a hexagonal head bolt with holes 14, a stop wire 15, a limit block 50, a double ear washer 49, Hexagonal bolt 48, the hexagonal bolt on the adjustment ring can adjust the sealing specific pressure at each point of the sealing secondary ring; the limit block, the double ear washer and the hexagonal bolt can limit the movement amount in the upstream direction of the valve seat. The packing gland and the valve cover are fixedly connected by stud bolts 34 and hexagon nuts 35, and a disc spring 36 is arranged between the hexagon nuts and the packing gland. The valve body is provided with a maintenance window, and the maintenance window is provided with a window cover 19, and the window cover and the valve body are connected by stud bolts 20 and hex nuts 21, and a first metal wound gasket 22 is arranged between the two. . The valve stem is connected with the actuator assembly through a flat key 32, and the actuator is a manual, electric or pneumatic actuator. The upper and lower shaft holes of the valve body are respectively provided with an upper shaft sleeve 45 and a lower shaft sleeve 5 outside the valve stem. The valve body and the valve cover are fixedly connected by a hex nut 42 and a stud 43, and a second metal wound gasket 44 is arranged between them. A packing gasket 40 is provided between the graphite packing layer and the packing gland, and an O-ring 39 is provided between the packing gland and the valve cover. The sealing ring of this application can be selected from PCFE sealing ring. the

According to the basic equation of convective heat dissipation between fluid and solid:

Heat dissipation Q = thermal conductivity λ × heat dissipation area A × temperature difference with the surrounding environment ΔT

We design the structure of the bonnet from the idea of increasing the thermal conductivity λ, increasing the convective temperature dissipation area A between the bonnet and the surrounding environment, and the convective temperature difference ΔT between the bonnet and the surrounding environment to design the structure of the bonnet as follows:

The bonnet of the cryogenic top-mounted butterfly valve is equipped with a single large-diameter heat dissipation plate on the outside and a multi-circle small-diameter heat dissipation plate on the top. In addition to temperature, multi-circle small-diameter cooling discs are added to the top of the bonnet, reasonable setting spacing, thin and small cooling disc thickness dimensions that are easy to process, and reasonable top wall thickness dimensions, thereby improving the average temperature conductivity. λ, and at the same time increase the convective heat dissipation area A between the cold temperature on the periphery of the top and the surrounding environment; due to the small radius of the small-diameter cooling plate, it is close to the cold temperature transmitted from the base surface of the cryogenic medium, and is in the best cold temperature and surrounding environment. Dispersion temperature difference ΔT, the temperature difference between the adjacent cooling discs from the bottom to the top has a non-linear gradient decrease, the cooling effect is excellent, ensuring that the temperature at the joint between the valve stem and the bottom of the packing does not condense when the temperature is above 0 °C Ice sticks. At the same time, the length of the valve cover is shortened, which reduces the cost.

In addition, the structure of the valve body with adjustable sealing specific pressure is as follows: there is a window cover for maintenance on the upper end of the valve body, an adjustment ring is provided behind the valve seat, and there are multiple hexagon bolts for adjustment to facilitate adjustment and ensure that the circumference The specific pressure of the sealing is adjusted in place, the processing size of the valve seat and the composite multi-layer sealing ring has a wide adaptability, and the interchangeability is strong, and it is easy to realize whether it is installation, maintenance, disassembly and replacement. Moreover, the valve seat is an axial floating structure, which can bear pressure in both directions to maintain sealing. The hidden danger of leakage caused by imperfect structure is eliminated. the

Claims (9)

1. A cryogenic butterfly valve with a compound cooling disc bonnet, characterized in that it includes a valve body (1), in which a butterfly plate assembly and an axially floating valve seat assembly are arranged, and the butterfly plate assembly and an axial floating The valve seat assembly forms a sealing structure, the valve stem (26) passes through the butterfly plate assembly and is fixed with the butterfly plate assembly, and passes through the upper and lower shaft holes of the valve body, and then passes through the valve cover (23) upwards, and is connected with the valve cover The graphite packing layer (41) in the upper sealing box protrudes out, and extends upwards through the bracket (29) to enter the actuator assembly (33) above the bracket, and the actuator assembly rotates 90° to drive the butterfly plate assembly to move; A packing gland (38) is arranged above the graphite packing, and a packing gland (37) is arranged on the packing gland, and the packing gland is fixedly connected with the bonnet; The disk (24) and the top are provided with a composite heat dissipation disk composed of multiple turns of small-diameter heat dissipation disks (25). 2. The cryogenic butterfly valve with composite cooling disc bonnet according to claim 1, characterized in that: the butterfly plate assembly includes a butterfly plate (10) and a composite multi-layer sealing ring (11) arranged in sequence from right to left , pressure ring (18), inner elastic washer (17) and hexagon screw (16), the composite multi-layer sealing ring has a radial elastic fine-tuning function when it is closed with the valve seat, so that the sealing pair maintains a tight sealing effect. 3. The cryogenic butterfly valve with composite cooling disc bonnet according to claim 1, characterized in that: the valve seat assembly includes a valve seat (8), a sealing ring (9), an adjustment ring (12), and a hole for Steel wire retaining ring (13), hexagon head bolt with hole (14), stop wire (15), limit block (50), double ear washer (49), hexagon bolt (48), hexagon on the adjustment ring The bolts can adjust the sealing specific pressure at each point of the sealing secondary ring; the limit block, double ear washer and hexagonal bolt can limit the movement of the valve seat in the upstream direction. 4. The cryogenic butterfly valve with composite cooling disc bonnet according to claim 1, characterized in that: the packing gland and the bonnet are fixedly connected by stud bolts (34) and hex nuts (35), A disc spring (36) is arranged between the hex nut and the packing gland. 5. The cryogenic butterfly valve with composite cooling disc bonnet according to claim 1, characterized in that: the valve body is provided with a maintenance window, and the maintenance window is provided with a window cover (19), and the gap between the window cover and the valve body is They are connected by stud bolts (20) and hex nuts (21), and a first metal wound gasket (22) is arranged between them. 6. The cryogenic butterfly valve with compound cooling disc bonnet according to claim 1, characterized in that: the valve stem is connected to the actuator assembly through a flat key (32), and the actuator is manual or electric or pneumatic actuators. 7. The cryogenic butterfly valve with composite cooling disc bonnet according to claim 1, characterized in that: the upper and lower shaft holes of the valve body are respectively provided with an upper shaft sleeve (45) and a lower shaft sleeve outside the valve stem (5). 8. The cryogenic butterfly valve with composite cooling disc bonnet according to claim 1, characterized in that: the valve body and the bonnet are fixedly connected by hex nuts (42) and studs (43), And a second metal wound gasket (44) is arranged between the two. 9. The cryogenic butterfly valve with composite cooling disc bonnet according to claim 1, characterized in that: a packing gasket (40) is provided between the graphite packing layer and the packing gland, and a packing gasket (40) is arranged between the packing gland and the valve cover. There is an O-ring (39) between them.

Images