CN207470787U - Two-seater voltage-stablizer spray valve - Google Patents

Abstract

The utility model discloses a spray valve for a two-seat voltage stabilizer, which comprises a valve body, a valve core and a valve rod. The valve body has a cavity. An upper bonnet is provided, and a lower bonnet is provided at the lower end of the valve body. The valve body has an inlet flow channel connected to the middle section of the cavity, an upper outlet flow channel connected to the upper section of the cavity, and an outlet lower flow channel connected to the lower section of the cavity. The middle section of the cavity There is an upper annular groove, the upper valve seat is embedded in the upper annular groove, the upper valve cover is pressed against the upper valve seat by the upper pressing sleeve, the lower annular groove is arranged in the middle of the cavity, the lower valve seat is embedded in the lower annular groove, the lower valve The cover presses the lower valve seat through the lower pressure sleeve; the valve core includes an upper valve core and a lower valve core, the upper valve core can be sealed on the upper valve seat, and the lower valve core can be sealed on the lower valve seat; The upper valve core is connected, and the other end passes through the upper valve cover and is connected with the actuator. The utility model has good sealing performance and large flow coefficient.

Description

Dual Seat Regulator Spray Valve

technical field

The utility model relates to the field of regulating valves for industrial systems, in particular to a spray valve for a double-seat regulator.

Background technique

The pressurizer spray valve is one of the pressure control equipment of the reactor coolant system of the pressurized water reactor nuclear power plant. Its function is to control the pressure in the reactor pressurizer within a certain range. The opening and closing of the regulator spray valve is controlled by the regulator pressure control system. When the pressure of the pressurizer rises, the pressure control system sends a signal to open the spray valve of the pressurizer, and the "cold fluid" in the cold section of the reactor coolant system is sprayed into the vapor space of the pressurizer through the spray valve and spray head of the pressurizer, so that Regulator pressure drops.

The working conditions of the regulator spray valve are: working temperature: 343°C, working pressure: 15.2 MPa, working pressure difference 0.6MPa. Low differential pressure operation requires a relatively high flow coefficient of the valve in order to achieve the specified flow. The first generation of regulator spray valves is a single-seat regulating valve with a bellows seal. The disadvantage is that in order to improve the flow coefficient, the valve body is made of castings. The second-generation spray valve is changed to a V-shaped ball valve structure due to the further improvement of the flow coefficient requirements. The disadvantage is that the bellows cannot be used for sealing, and the L-shaped arrangement of the valve is not very convenient.

The double-seat control valve is a control valve structure that appeared earlier. The outstanding disadvantage is that the two sealing surfaces cannot be in good contact at the same time, resulting in large leakage.

Contents of the invention

The technical problem to be solved by the utility model is to provide a two-seat regulator spray valve, which can have a large flow coefficient and is easy to disassemble.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a two-seat regulator spray valve, including a valve body, a valve core and a valve stem, the valve body has a cavity penetrating along the height direction, so The cavity includes an upper section of the cavity, a middle section of the cavity and a lower section of the cavity from top to bottom. The upper end of the valve body is provided with a detachable upper valve cover, and the lower end of the valve body is provided with a detachable lower valve cover. The valve body has an inlet channel communicating with the middle section of the cavity, an upper outlet channel communicating with the upper section of the cavity, and an outlet lower channel communicating with the lower section of the cavity,

The middle section of the cavity is provided with an upper annular groove at the position below the upper flow channel of the outlet, and an upper valve seat is embedded in the upper annular groove, and the upper valve cover is pressed against the upper valve seat through an upper pressure sleeve, so that The middle section of the cavity is located above the outlet lower flow channel and is provided with a lower annular groove, the lower valve seat is embedded in the lower annular groove, and the lower valve cover is pressed against the lower valve seat through the lower pressure sleeve;

The valve core includes an upper valve core and a lower valve core connected by connecting parts, the upper valve core can be blocked on the upper valve seat, and the lower valve core can be blocked on the lower valve seat;

One end of the valve rod is connected with the upper valve core, and the other end passes through the upper valve cover and is connected with the actuator.

As a preferred solution, a guide rod is provided on the lower part of the lower valve core, and a guide sleeve that can move along the guide rod is provided on the lower valve cover.

As a preferred solution, the connecting part is a rod-shaped part arranged between the upper valve core and the lower valve core.

As a preferred solution, an annular cavity is formed between the upper valve cover and the valve stem, and there is a bellows sleeve in the annular cavity, and the bellows sleeve is fixed on the upper valve cover and the valve stem through a flange at the lower end. Between the valve bodies, a bellows is provided on the outer sleeve of the valve stem, the lower end of the bellows is connected to the valve core, and the upper end is connected to a joint provided on the bellows sleeve.

As a preferred solution, a screw plug is arranged on the upper valve cover.

As a preferred solution, a cylindrical portion is provided on the upper valve core, the valve stem is screwed to the cylindrical portion, and a pin is passed through the valve stem and the cylindrical portion.

As a preferred solution, the outlet upper channel and the outlet lower channel are arranged in a V shape, and the outlet upper channel and the outlet lower channel are combined to form an output port at a position away from the valve core.

As a preferred solution, the valve body is a forging.

As a preferred solution, the actuator is a pneumatic actuator.

As a preferred solution, gaskets are provided between the upper valve seat and the valve body and between the lower valve seat and the valve body.

The spray valve of the double-seat voltage stabilizer implementing the utility model has the following beneficial effects: adopting two valve seats and two valve cores can have a larger flow coefficient; using the upper valve cover to press the upper valve seat, and the lower valve cover The lower valve seat is pressed tightly without threaded connection, so the disassembly and assembly are convenient and efficient. Bellows are used to increase the self-vibration frequency. The valve body is made of forgings, which can guarantee the quality.

Description of drawings

The utility model will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is the cross-sectional view of an embodiment of the two-seat regulator spray valve of the present utility model;

Fig. 2 is the schematic diagram after removing actuator in Fig. 1;

Fig. 3 is a virtual sectional view of the valve body in Fig. 1 .

In the above drawings,

1-lower bonnet; 2-flange sealing ring; 3-valve body; 4-upper bonnet; 5-flange bolts; 10-lower valve seat; 11-spool; 1101-upper spool; 1102-lower spool; 1103-connecting parts; 1104-guide rod; 12-upper valve seat; 13-pin; 15-valve stem; 16-bellows; 17-bellows sleeve; 18-screw plug; 19-inlet runner; 20-outlet lower runner; 24-connecting flange; 25-cavity upper section; 26-cavity lower section.

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the embodiments and accompanying drawings.

Referring to FIGS. 1-2 , the spray valve for a two-seat regulator of the present invention includes a valve body 3 , a valve core 11 and a valve stem 15 . The valve body 3 is preferably a forging, which is easy to ensure quality.

The valve body 3 has a cavity penetrating along the height direction, and the cavity includes an upper cavity section 25 , a cavity middle section 21 and a cavity lower section 26 from top to bottom. The upper end of the valve body 3 is provided with a detachable upper valve cover 4. For example, as shown in the figure, the upper valve cover 4 is provided with flange bolts 5, and tapped on the valve body 3 to form a connecting flange 24. The bolt 5 passes through the upper valve cover 4 and is screwed on the valve body 3 . The lower end of the valve body 3 is provided with a detachable lower valve cover 1 , similarly, the lower valve cover 1 is provided with flange bolts 5 , and the flange bolts 5 pass through the lower valve cover 1 and are screwed on the valve body 3 . This flange connection can meet the requirements of quick repair. A flange sealing ring 2 is provided between the lower valve cover 1 and the valve body 3 to form a complete pressure boundary. In addition, a flange sealing ring 2 may also be provided between the upper valve cover 4 and the valve body 3 .

As shown in FIG. 3 , the valve body 3 has an inlet channel 19 communicating with the middle section 21 of the cavity, an upper outlet channel 22 communicating with the upper section of the cavity, and a lower outlet channel 20 communicating with the lower section of the cavity. Further, the outlet upper channel 22 and the outlet lower channel 20 are arranged in a V shape, and the outlet upper channel 22 and the outlet lower channel 20 are combined into an output port 23 at a position away from the valve core 11 . The inlet runner 19, the outlet upper runner 22 and the outlet lower runner 20 are all rotary surfaces, which are convenient for processing.

The middle section 21 of the cavity is located below the upper flow channel 22 of the outlet, and an upper annular groove is provided. The upper annular groove can be stepped as shown in the figure, and an upper valve seat 12 is embedded in the upper annular groove. The upper valve seat 12 and The shape of the upper annular groove matches, and the upper valve cover 4 presses the upper valve seat 12 through the upper pressing sleeve 14, so the upper valve seat 12 does not need to be fixed by bolts. The middle section 21 of the cavity is located above the outlet lower flow channel 20 and is provided with a lower annular groove, which is similar in shape to the upper annular groove. The lower valve seat 10 is embedded in the lower annular groove. Seat 10, also need not bolt. Gaskets 9 are arranged between the upper valve seat 12 and the valve body 3 and between the lower valve seat 10 and the valve body 3 to ensure sealing.

The valve core 11 includes an upper valve core 1101 and a lower valve core 1102 connected by a connecting part 1103 , the upper valve core 1101 can be blocked on the upper valve seat 12 , and the lower valve core 1102 can be blocked on the lower valve seat 10 . As shown in the figure, the connecting part 1103 is a rod-shaped part arranged between the upper valve core 1101 and the lower valve core 1102 , and it can be integrally formed with the upper valve core 1101 and the lower valve core 1102 .

One end of the valve stem 15 is connected with the upper valve core 1101. As shown in the figure, the upper valve core 1101 is provided with a cylindrical portion, the valve stem 15 is threadedly connected with the cylindrical portion, and the valve stem 15 and the cylindrical portion are pierced with pins. 13. Prevent the valve stem 15 from loosening with the cylindrical part. The other end of the valve stem 15 passes through the upper bonnet 4 and is connected with the actuator 6. The actuator 6 may be a pneumatic actuator, specifically an adjustable pneumatic actuator, which is responsible for realizing the switch and adjustment functions of the valve. The adjustment type pneumatic actuator can be selected from the existing schemes, so it will not be expanded any more.

As shown in Figures 1 and 2, the bottom of the lower valve core 1102 is provided with a guide rod 1104, and the lower valve cover 1 is provided with a guide sleeve 7 for the guide rod to move along, which can facilitate the guidance of the valve core 11 when moving. . The spool 11 has guides up and down, which can improve its working stability.

In order to facilitate sealing and increase the self-vibration frequency, an annular cavity is formed between the upper valve cover 4 and the valve stem 15, and a bellows sleeve 17 is provided in the annular cavity, and the bellows sleeve 17 is sleeved on the outside of the valve stem 15. The bellows sleeve 17 is fixed between the upper valve cover 4 and the valve body 3 through the flange at the lower end, for example, as shown in the figure, a groove is provided at the bottom of the upper valve cover 4 and the top of the valve body 3, and the flange is located at the top of the valve body 3. In the groove, when the upper valve cover 4 is fixed on the valve body 3, the bellows sleeve 17 is fixed together. The valve stem 15 is covered with a bellows 16 , the lower end of the bellows 16 is connected to the valve core 11 , and the upper end is connected to a joint provided on the bellows sleeve 17 . Further, the upper valve cover 4 is provided with a screw plug 18, which can be used for leak detection when the bellows 16 is broken.

The spray valve of the double-seat voltage stabilizer of the utility model is designed to ensure its performance and sealing reliability. In order to ensure the uniformity of the working fluid inside the regulator, the spray valve of the regulator needs to have a certain discharge flow. The double-seat valve has a large flow coefficient, and the advantage of using bellows for the straight stroke is exactly what the regulator spray valve needs. The valve body of the utility model adopts forgings to ensure the quality; the thread of the valve seat is eliminated, which is convenient for quick disassembly; the inner-penetrating bellows is designed without using a transition section, so as to increase the self-vibration frequency.

The basic principles and main features of the present utility model and the advantages of the present utility model have been shown and described above. Those skilled in the industry should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (10)

1. a kind of two-seater voltage-stablizer spray valve, which is characterized in that including valve body, spool and valve rod, the valve body has along height The perforative cavity in direction is spent, the cavity includes cavity epimere, cavity stage casing and cavity hypomere, the valve body successively from top to bottom Upper end dismountable bonnet, is set, the lower end of the valve body sets dismountable bottom flange, the valve body have with it is described It the inlet channel of cavity stage casing connection, the outlet upper runner that is connected with the cavity epimere and is connected with the cavity hypomere Export lower flow channel,

The position that the cavity stage casing is located at below the outlet upper runner is provided with annular groove, and the upper annular groove is embedded in There is upper valve base, the bonnet, compresses the upper valve base by upper pressing sleeve, and the cavity stage casing is located in the outlet lower flow channel The position of side is provided with lower annular groove, and the lower annular groove has been embedded in lower valve base, and the bottom flange compresses institute by pushing to cover State lower valve base；

The spool includes the upper valve core and bottom spool that are connected by connecting component, and the upper valve core can be blocked in the upper valve On seat, the bottom spool can be blocked on the lower valve base；

One end of the valve rod is connect with the upper valve core, and the other end passes through the bonnet, and connect with executing agency.

2. two-seater voltage-stablizer spray valve according to claim 1, which is characterized in that the lower part of the bottom spool, which is provided with, leads To bar, the guide sleeve that can be moved along for the guide rod is provided on the bottom flange.

3. two-seater voltage-stablizer spray valve according to claim 1, which is characterized in that the connecting component is described to be arranged on Rod-like members between upper valve core and the bottom spool.

4. two-seater voltage-stablizer spray valve according to claim 1, which is characterized in that between the bonnet, and the valve rod Annular chamber is formed with, there is bellows-sheathed in the annular chamber, the bellows-sheathed is fixed on by the flange of lower end on described Between valve deck and the valve body, bellows is arranged with outside the valve rod, the lower end of the bellows is connect with the spool, upper end It is connect with the connector being set on the bellows-sheathed.

5. two-seater voltage-stablizer spray valve according to claim 4, which is characterized in that be provided with plug screw on the bonnet,.

6. two-seater voltage-stablizer spray valve according to claim 1, which is characterized in that be provided with cylindricality on the upper valve core Portion, the valve rod are threadedly coupled with the cylindrical portion, and pin is equipped in the valve rod and the cylindrical portion.

7. two-seater voltage-stablizer spray valve according to claim 1, which is characterized in that the outlet upper runner and the outlet The V-shaped arrangement of lower flow channel, the outlet upper runner are aggregated into output with the outlet lower flow channel in the position far from the spool Mouthful.

8. two-seater voltage-stablizer spray valve according to claim 1, which is characterized in that the valve body is forging.

9. two-seater voltage-stablizer spray valve according to claim 1, which is characterized in that the executing agency performs machine to be pneumatic Structure.

10. two-seater voltage-stablizer spray valve according to claim 1, which is characterized in that the upper valve base and the valve body it Between and the lower valve base and the valve body between be both provided with gasket.