CN204459216U - High-pressure self-balance self-sealing piston formula regulates throttling stop valve - Google Patents

Abstract

The utility model relates to a high-pressure self-balancing self-sealing piston-type regulating throttling cut-off valve, which comprises a valve body, a valve seat, a valve cover, a piston disc, a valve rod and a cylinder sleeve, and is arranged at the contact point between the valve seat and the piston disc. The first sealing assembly, the outer wall of the piston valve disc is provided with an upper sealing surface placed at the upper end of the first passage and a lower sealing surface placed at the lower end of the first passage, the first sealing assembly and the piston valve disc form an adjustable throttling cut-off When the valve is in the throttling state, the first state is that the lower sealing surface is attached to the first sealing assembly; after the throttling stop valve is fully opened, the lower sealing surface is attached to the first sealing assembly; and After the throttling stop valve is closed, the upper sealing surface is in the third state where the first sealing component fits. The first sealing component and the sealing surface of the piston disc are used in the entire opening and closing and throttling states of the regulating throttle stop valve. It will not be washed by the medium at any time, so that the service life of the high-pressure state of the regulating throttle stop valve is greatly improved.

Description

High-pressure self-balancing self-sealing piston-type regulating throttle stop valve

technical field

The utility model relates to a cut-off valve, in particular to a high-pressure self-balancing self-sealing piston-type regulating throttling stop valve.

Background technique

The opening and closing part of the globe valve is a plug-shaped disc, the sealing surface is flat or conical, and the disc moves linearly along the center line of the valve seat. The movement form of the valve stem has a lifting rod and a rotating lifting rod, which can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Therefore, this This type of shut-off globe valve is very suitable for cutting or regulating and throttling. Because the opening or closing stroke of the valve stem of this type of valve is relatively short, and it has a very reliable cut-off function, and because the change of the valve seat opening is proportional to the stroke of the valve disc, it is very suitable for flow adjustment.

The sealing performance of the stop valve determines the use of the stop valve, and the existing stop valve, in the open state, the fluid will wash the sealing surface of the valve disc and the valve seat, and the hard seal is used between the valve disc and the valve seat, which can prolong the sealing However, when it is used under the condition of high pressure and small opening adjustment, the erosion is very serious, and the service life is very short, which will cause the throttling and cut-off functions of the cut-off valve to fail.

Utility model content

In order to overcome the deficiency that the sealing surface of the stop valve is damaged due to the scouring and erosion of the high-pressure medium under the state of high-pressure small opening adjustment and throttling, the utility model provides a high-pressure self-balancing self-sealing piston-type adjustable throttling cut-off valve. valve.

The technical scheme adopted by the utility model is: a high-pressure self-balancing self-sealing piston-type regulating throttling cut-off valve, which includes a valve body, a valve seat, a valve cover, a piston disc, a valve rod and a cylinder sleeve. There is a piston valve disc, the valve cover is placed on the upper surface of the valve body, the valve stem runs through the valve cover, and is connected with the piston valve disc to form the linkage cooperation between the valve stem and the piston valve disc, and the axial direction between the valve body and the piston disc A valve seat and a cylinder liner are provided, a flow channel inlet and a flow channel outlet are provided on the valve body, and a first channel communicating with the flow channel inlet is radially provided on the piston valve disc. An open groove communicated with the inlet of the flow channel is arranged axially on the petal, and a second passage communicated with the outlet of the flow passage is provided on the cylinder liner, and the distance from the lower port of the second passage to the upper end surface of the valve seat is greater than that of the first The height of the channel, the first channel and the second channel form different overlapping areas under the condition of adjusting the opening and closing of the throttling stop valve to form the flow adjustment; there is a limit mechanism that limits the circumferential rotation of the valve stem; it is set between the valve seat and the piston The first sealing assembly at the contact point of the valve disc, the outer wall of the piston valve disc is provided with an upper sealing surface placed at the upper end of the first passage and a lower sealing surface placed at the lower end of the first passage, the first sealing assembly and the piston valve disc It constitutes the first state where the lower sealing surface fits the first sealing assembly when the throttling cut-off valve is adjusted and throttled; after the throttling cut-off valve is fully opened, the lower sealing surface fits the first sealing assembly the second state; and the third state in which the upper sealing surface is in contact with the first sealing assembly after the throttle stop valve is closed.

The distance from the lower port of the second passage to the upper end surface of the valve seat is greater than the height of the first passage.

The upper sealing surface is made of tungsten carbide.

The first sealing assembly includes a first sealing member arranged at the contact position of the valve seat, the piston disc and the cylinder liner, and the first sealing member forms an oblique fit with the valve seat.

The contact position of the valve body, the valve seat and the piston disc forms a first vertical opening gap, and the contact position of the valve seat and the cylinder liner forms a second lateral opening gap.

The valve body and the valve cover are fastened by adjusting bolts, and a third gap which can be regulated by adjusting bolts is reserved.

The end connecting the valve stem and the piston disc is a T-shaped piece, and the upper end of the piston valve disc is provided with a limiting groove, and the T-shaped piece is snapped into the limiting groove.

A valve disc cover is arranged on the piston valve disc, and the valve rod is connected with the piston valve disc through the valve disc cover.

A third passage connecting the limiting groove and the opening groove is axially provided on the piston valve disc, and a fourth passage connecting the limiting groove and the inner chamber of the cylinder liner is formed at the contact point of the valve rod and the piston valve disc.

An indicating rod for indicating the axial displacement of the valve rod is connected to the top of the valve rod, a shield placed outside the indicating rod, and an observation hole arranged on the shield.

It also includes a hand wheel that drives the axial movement of the valve stem.

The beneficial effects of the utility model are:

(1) There are first and second channels on the piston valve disc and the cylinder liner respectively. By controlling the change of the overlapping area of the two, the throttling function can be realized. The change of the shape of the channel hole can form a fast flow channel. Open, linear, equal percentage flow characteristics; when the throttling stop valve is opened, the first and second passages must be connected to realize the communication of the flow passage and the valve stem does not rotate to drive the axial movement of the piston disc, so a limit is added Mechanism, which forms a circumferential limit on the piston valve disc or valve stem to ensure that the valve stem will not idle during the opening and closing process;

(2) After the throttle stop valve is closed, the throttling state is adjusted, or it is fully opened, the sealing surface of the piston disc is in contact with the first sealing component, so that the first sealing component is not in contact with the fluid, forming a seal against the first sealing component. Especially in the throttling state, when the upper end of the first channel is aligned with the lower end of the second channel, the throttle stop valve starts to work. At this time, the first sealing component starts to form a seal with the lower sealing surface, and the flow direction of the medium is determined. Changing from axial flow to radial flow, the medium will never wash away the sealing surface of the piston disc and form an effective protection for it. At the same time, it can effectively seal when the cut-off seal is required, effectively solving the small opening of the high-pressure regulating throttle valve. During the opening process of the regulating throttle stop valve, the first passage passes through the first sealing assembly, and the fluid passes through the first passage through the tiny gap between the inner wall of the cylinder liner and the sealing surface of the piston disc. Leakage, but the leakage flow rate is too small to meet the minimum flow requirement, so the process needs to be lifted quickly, so that when the upper end of the first channel is aligned with the lower end of the second channel, the characteristic curve of the adjusted flow begins to form. During this lifting process, the medium has a pair of piston valves The sealing surface of the valve disc causes erosion, but the process time is very short and can be almost ignored. Therefore, the cooperation between the piston valve disc and the first sealing component with this structure, the first sealing component, and the sealing surface of the piston valve disc are in the process of adjusting the throttling cut-off. The entire opening and closing of the valve and the regulating throttling state will not be washed by the medium, so that the service life of the regulating throttling stop valve in the high pressure state is greatly improved.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model.

Fig. 2 is an enlarged view of A in Fig. 1 .

Fig. 3 is an enlarged view at point C in Fig. 1 .

Fig. 4 is an enlarged view of B in Fig. 1 .

1-valve body, 11-runner inlet, 12-runner outlet, 2-valve seat, 21-first seal, 22-second seal, 23-third seal, 24-first gap, 25 -Second gap, 3-bonnet, 31-fine-tuning bolt, 32-third gap, 4-piston disc, 4a-upper sealing surface, 4b-lower sealing surface, 41-first channel, 42-guide groove, 43-limiting groove, 44-third channel, 45-opening groove, 5-valve stem, 51-T-shaped piece, 6-cylinder liner, 61-second channel, 62-cylinder liner cavity, 7-valve Flap cover, 71-guide rod, 72-the fourth channel, 8-indicating rod, 81-shield, 82-observation hole, 9-handwheel.

Detailed ways

Below in conjunction with accompanying drawing, the utility model embodiment is further described:

As shown in Figures 1 and 2, a high-pressure self-balancing self-sealing piston-type regulating throttle valve includes a valve body 1, a valve seat 2, a valve cover 3, a piston disc 4, a valve stem 5 and a cylinder liner 6 , the valve body 1 is provided with a piston valve disc 4, the valve cover 3 is placed on the upper surface of the valve body 1, the valve stem 5 penetrates the valve cover 3, and is connected with the piston valve disc 4, forming the connection between the valve stem 5 and the piston valve disc 4 Linkage cooperation, between the valve body 1 and the piston valve disc 4, the valve seat 2 and the cylinder liner 6 are arranged in sequence in the axial direction, and the flow channel inlet 11 and the flow channel outlet 12 are arranged on the valve body 1. A first channel 41 communicated with the flow channel inlet 11 is arranged radially on the valve disc 4, and an opening groove 45 communicated with the flow channel inlet 11 is provided axially on the piston valve disc 4, and on the cylinder liner 6 There is a second channel 61 communicating with the flow channel outlet 12, the distance from the lower port of the second channel 61 to the upper end surface of the valve seat 21 is greater than the height of the first channel 41, and the first channel 41 and the second channel 61 are at the adjustment joint Different overlapping areas are formed in the opening and closing state of the flow cut-off valve to form flow adjustment; a limit mechanism is provided to limit the circumferential rotation of the valve stem 5; The outer wall of the piston valve disc 4 is provided with an upper sealing surface 4a placed at the upper end of the first channel 41 and a lower sealing surface 4b placed at the lower end of the first channel 41, and the first sealing assembly and the piston valve disc 4 form an adjustable throttling cut-off When the valve is in the throttling state, the first state where the lower sealing surface 4b is attached to the first sealing assembly; after the throttle valve is fully opened, the second state where the lower sealing surface 4b is attached to the first sealing assembly ; and after the throttle stop valve is closed, the third state where the upper sealing surface 4a fits with the first sealing assembly; as the valve stem 5 rises, when the upper end of the first passage 41 and the lower end of the second passage 61 begin to align Before the first passage 41 and the second passage 61 completely overlap, it is the regulating throttling state of the throttling cut-off valve; the first and second passages are respectively arranged on the piston disc 4 and the cylinder liner 6, by controlling the flow of the two The change of the overlapping area is used to realize the throttling function. Through the change of the shape of the channel hole, the characteristics of quick-opening, linear, and equal percentage flow can be formed; when the throttling stop valve is opened, the first and second channels must be connected. In order to realize the connection of the flow channel and the non-rotation of the valve stem 5 to drive the axial movement of the piston valve disc 4, a limit mechanism is added to form a circumferential limit for the piston valve disc 4 or valve stem 5 to ensure that the valve stem 5 is in the starting position. It will not idle during the closing process; after the regulating throttle stop valve is fully opened, the fluid enters the regulating throttle stop valve from the flow channel inlet 11, and flows out of the regulating throttle stop valve from the flow channel outlet 12 through the first and second channels. At this time, because the lower sealing surface 4b is in contact with the first sealing assembly, that is, the lower sealing surface 4b forms protection for the first sealing assembly, so that the circulating fluid will not contact the first sealing assembly, that is, it will not affect the first sealing assembly. cause flushing, prolonging the service life of the first sealing assembly; similarly, after the throttle stop valve is closed, although there is still fluid remaining in the first channel 41, at this time, due to the contact between the upper sealing surface 4a and the first sealing assembly fit, that is, the upper sealing surface 4a constitutes the first sealing assembly It is protected so that the retained fluid will not come into contact with the first sealing assembly; in the throttling state, when the upper end of the first passage 41 is aligned with the lower end of the second passage 61, the throttling cut-off valve starts to work, that is, the throttling is adjusted The cut-off valve enters the throttling state. At this time, the first sealing component starts to form a seal with the lower sealing surface 4b, and the flow direction of the medium changes from the axial direction to the radial flow. Effective protection is formed; while the first channel 41 passes through the first sealing assembly during the opening process of the regulating throttle stop valve, the fluid passes through the first channel 41 to form a leak through the tiny gap between the inner wall of the cylinder liner and the sealing surface of the piston disc. , but the leakage flow rate is too small to meet the minimum flow requirement, so the process needs to be raised quickly, so that when the upper end of the first channel 41 is aligned with the lower end of the second channel 61, the characteristic curve of the adjusted flow rate begins to form. The sealing surface of the valve flap causes erosion, but the process time is very short and can be almost ignored. Further, the upper sealing surface 4a is hardened by spray welding tungsten carbide, which increases the wear resistance of the piston valve flap 4, making the piston valve flap 4 It can effectively resist instant erosion. Of course, other hardening methods can also be used for the upper sealing surface 4a; The entire opening and closing of the throttling cut-off valve and the throttling adjustment state will not be washed by the medium during use, so that the service life of the high-pressure state of the throttling adjustment cut-off valve is greatly improved.

The first sealing assembly includes a first seal 21 arranged at the contact position of the valve seat 2, the piston disc 4 and the cylinder liner 6, a second seal 22 at the contact position of the valve seat 2 and the piston disc 4, and The third seal 23 at the contact between the valve seat 2 and the valve body 1, the first, second, and third seals are used to seal the corresponding contact, so that each contact is sealed and does not leak; the first seal 21 and The valve seat 2 forms an inclined plane matching. During the opening process of the throttle stop valve, the piston disc 4 moves upward in the axial direction, and the piston disc 4 gives the valve seat 2 an upward friction force. Under the action of this friction force, The slope between the first sealing member 21 and the valve seat 2 will fit more tightly, so as to achieve a further sealing effect.

As shown in Figure 2, the contact between the valve body 1, the valve seat 2 and the piston disc 4 constitutes the first vertical opening 24, and the contact between the valve seat 2 and the cylinder liner 6 constitutes the first horizontal opening. The second gap 25, before the throttle stop valve is opened, the fluid enters the valve body 1 from the flow channel inlet 11, and enters the first gap 24 at the same time, acting on the ring surface of the lower end of the valve seat 2, and on the end surface with the increase of the medium pressure A large, axial upward thrust is generated to push the valve seat 2 to move upward, and the existence of the second gap 25 provides a margin for the upward movement of the valve seat 2, and under the action of pressure, the valve seat 2 is further driven Moving upward, the slope between the first sealing member 21 and the valve seat 2 is further compressed and fitted to form the first self-sealing adjustment of the regulating throttle stop valve, that is, the higher the medium pressure, the greater the tight fitting force. The easier it is to seal, the tighter the sealing surface will be.

As shown in Figure 3, the valve body 1 and the valve cover 3 are fastened by fine-tuning bolts 31, and a third gap 32 that can be regulated by the fine-tuning bolts 31 is reserved, and the axial downward effect is generated by the fine-tuning bolts 31. The force acts on the first sealing member 21 through the fine-tuning bolt 31, the valve cover 3 and the cylinder liner 6 in turn, and the first sealing member 21 is forced to move downward, so that the gap between the first sealing member 21 and the valve seat 2 The inclined plane between them is further fitted to form the second self-sealing adjustment of the regulating throttle stop valve, which makes the sealing surface more tight and prevents the first seal 21 from appearing after the regulating throttle stop valve is used on the pipeline for a long time. After the leakage occurs, the first sealing member 21 can be tightened on-line by tightening the fine-tuning bolt 31 to re-enable sealing, which is convenient for on-line maintenance.

When the valve disc cover 7 is not provided on the piston valve disc 4, a limiting groove 43 with one end opening is directly opened on the piston valve disc 4 through processing technology, and the valve stem 5 is laterally socketed in the limiting groove 43 through the opening. , then put the piston disc 4 and valve stem 5 into the valve body 1, and the opening end is limited by the cylinder liner 6 to prevent the valve stem 5 from falling out, but in this case, the piston disc 4 is not easy to process, And the valve stem 5 may shake during the axial movement; therefore, a valve flap cover 7 is arranged on the piston valve flap 4, and the valve stem 5 is connected with the piston valve flap 4 through the valve flap cover 7. This structure is easy to process and easy to assemble. convenient.

The position-limiting mechanism includes a guide rod 71 arranged axially parallel to the valve rod 5 and a guide groove 42 axially penetrating the piston disc 4, the upper end of the guide rod 71 is fixed on the lower end of the valve cover 3, and the lower end of the guide rod 71 is placed In the guide groove 42, the two form a sliding fit, the design of the guide rod 71, the guide rod 71 constitutes a circumferential limit to the piston valve disc 4, to ensure that the piston valve disc 4 will not rotate circumferentially during the opening and closing process, thereby Ensure that the valve stem 5 will not run idly. Further, the limit mechanism is arranged in the valve body 1, so that the structure of the throttling stop valve is more compact. Of course, the limit mechanism can also use other methods, such as bolts to the valve stem. 5 Carry out radial limit to prevent its circumferential rotation from causing idling.

The guide groove 42 communicates with the opening groove 45, and the fluid enters the opening groove 45. At this time, the throttle stop valve is not opened, and the upward pressure of the fluid acts on the piston disc 4, and under this pressure, the fluid passes through the guide groove 42. , enter the inner cavity 62 of the cylinder liner and generate downward pressure to act on the piston valve disc 4. When the upward pressure and downward pressure of the fluid are balanced on the piston valve disc 4, the piston valve disc 4 is in a self-balancing state. Compared with the opening of the regulating throttle stop valve in the past, it is necessary to overcome the downward pressure on the piston disc 4 due to the compression of the inner cavity 62 of the cylinder liner. The improved structure avoids this force and can be easily opened to adjust the throttle stop valve. valve.

As shown in Figure 4, the end of the valve stem 5 connected to the piston valve flap 4 through the valve flap cover 7 is a T-shaped piece 51, and the maximum diameter of the T-shaped piece 51 is larger than the valve stem 5 on the valve flap cover 7. aperture, thus the valve disc cover 7 and the piston valve disc 4 are driven to rise axially through the axial rise of the valve stem 5; the section of the T-shaped piece 51 shown in Fig. A circular surface is formed by symmetrical milling, so the two symmetrical sides are straight lines parallel to each other, and the other two symmetrical sides are arc segments. The T-shaped piece 51 is inserted into the valve disc cover 7 and the piston valve disc 4 to form a In the limiting groove 43, the lower end surface of the T-shaped piece 51 is against the bottom surface of the limiting groove 43, thereby driving the valve disc cover 7 and the piston valve disc 4 to descend axially through the axial decline of the valve stem 5; T The two straight lines of the profile 51 fit together with the limit groove 43, so that the piston valve disc 4 and the valve stem 5 form a circumferential linkage and cooperation, so the guide rod 71 is used to limit the piston valve disc 4 in the circumferential direction, that is, It plays the role of circumferentially limiting the valve stem 5 .

A third channel 44 connecting the limiting groove 43 and the opening groove 45 is axially provided on the piston disc 4. After the valve rod 5 penetrates the valve disc cover 7, a communicating limiting groove 43 and an opening groove 45 are formed between the two. In the fourth channel 72 of the inner cavity 62 of the cylinder liner, the fluid enters the opening groove 45 through the first channel 41 or directly enters the opening groove 45, and then enters the inner cavity 62 of the cylinder liner through the fourth and fourth channels in turn, and between the guide groove 42 and the opening groove 45. The connection between the cylinder liner inner cavity 62 is formed by the gap between the guide rod 71 and the disc cover 7, so the connection between the guide groove 42 and the cylinder liner inner cavity 62 is a small channel, and the fluid passes through slowly, and the piston valve It takes a long time for the petal 4 to achieve self-balancing, so the fourth channel 72 is added. Although the fourth channel 72 is also formed by using the gap between the valve stem 5 and the valve disc cover 7, it is also a small channel, but the two channels are used for fluid passage at the same time. , the total time consumption is reduced to a certain extent.

The top end of the valve stem 5 is connected with an indicator rod 8 for indicating the axial displacement of the valve stem 5, and a shield 81 placed outside the indicator rod 8. The valve stem 5 is connected with the indicator rod 8, and the throttling can be adjusted macroscopically. During the opening and closing process of the stop valve, the operating position of the valve stem 5, more precisely, is the operating position of the piston disc 4, and an observation hole 82 is also set on the guard 81, through which the regulating flow rate can be viewed. Check the position of the top of the valve stem to confirm the overlapping height of the first and second passages, that is, to adjust the flow opening of the throttle stop valve. When the top of the valve stem 5 is aligned with the bottom of the observation hole 82, the flow adjustment starts Minimum opening, then the valve stem 5 gradually rises, and the flow rate increases linearly, so when the top of the valve stem 5 is not within the scope of the observation hole 82, it is necessary to quickly switch the throttle stop valve to prevent small gaps before work Flushing the sealing surface of the valve clack provides multiple protections for the sealing components in operation, and the side of the observation hole 82 is also engraved with precise size scales, which is convenient for the operator to adjust the flow rate.

It also includes a hand wheel 9 that drives the valve stem 5 to move axially, through which the opening and closing of the throttling stop valve can be controlled and adjusted. Of course, pneumatic and electric devices can also be used to control and adjust the opening and closing of the throttling stop valve. open and close state.

The embodiments described above in conjunction with the accompanying drawings are only preferred implementations of the present utility model, rather than limiting the scope of protection of the present utility model. Any improvements made based on the spirit of the present utility model should fall within the scope of protection of the present utility model .

Claims (10)

1. a high-pressure self-balance self-sealing piston formula regulates throttling stop valve, it comprises valve body (1), valve seat (2), valve gap (3), piston flap (4), valve rod (5) and cylinder sleeve (6), piston valve lobe (4) is arranged with in valve body (1), valve gap (3) is placed in valve body (1) upper-end surface, valve rod (5) runs through valve gap (3), and be connected with piston flap (4), formation valve rod (5) is linked with piston flap (4), axially valve seat (2) and cylinder sleeve (6) is provided with successively between valve body (1) and piston flap (4), described valve body (1) is provided with tunnel inlets (11) and runner exit (12), it is characterized in that: be provided with in the upper radial direction of described piston flap (4) first passage (41) communicated with tunnel inlets (11), described piston flap (4) is axially arranged with the opening slot (45) communicated with tunnel inlets (11), described cylinder sleeve (6) is provided with the second channel (61) communicated with runner exit (12), described second channel (61) lower end mouth is greater than the height of first passage (41) to the distance of valve seat (21) upper-end surface, first passage (41) and second channel (61) form different overlapping area to form Flow-rate adjustment regulating under throttling stop valve open/close states, be provided with the position-limit mechanism that restriction valve rod (5) rotates in a circumferential direction, be arranged on the first black box of valve seat (2) and piston flap (4) contacting point, described piston flap (4) outer wall is provided with the upper sealing surface (4a) being placed in first passage (41) upper end and the lower sealing surface (4b) being placed in first passage (41) lower end, described first black box and piston flap (4) form and regulate throttling stop valve regulating under throttle, the first state that lower sealing surface (4b) and the first black box fit, after regulating throttling stop valve to open completely, the second state that lower sealing surface (4b) and the first black box fit, after closing with adjustment throttling stop valve, the third state that upper sealing surface (4a) and the first black box fit.

2. high-pressure self-balance self-sealing piston formula according to claim 1 regulates throttling stop valve, it is characterized in that: described upper sealing surface (4a) adopts Tungsten carbite.

3. high-pressure self-balance self-sealing piston formula according to claim 1 regulates throttling stop valve, it is characterized in that: described first black box comprises the first Sealing (21) being arranged on valve seat (2), piston flap (4) and cylinder sleeve (6) three contacting point, forms inclined-plane and coordinate between this first Sealing (21) with valve seat (2).

4. high-pressure self-balance self-sealing piston formula according to claim 3 regulates throttling stop valve, it is characterized in that: described valve body (1), valve seat (2) form first space (24) of vertical openings with the contacting point of piston flap (4), described valve seat (2) forms the Second gap (25) of transverse opening with the contacting point of cylinder sleeve (6).

5. high-pressure self-balance self-sealing piston formula according to claim 3 regulates throttling stop valve, it is characterized in that: described valve body (1) is fastening by trimming bolt (31) with valve gap (3), and has reserved the 3rd space (32) regulated and controled by trimming bolt (31).

6. high-pressure self-balance self-sealing piston formula according to claim 1 regulates throttling stop valve, it is characterized in that: the end that described valve rod (5) is connected with piston flap (4) is T-shaped (51), described piston flap (4) upper end is provided with limited impression (43), and this T-shaped (51) inlay card is in limited impression (43).

7. high-pressure self-balance self-sealing piston formula according to claim 6 regulates throttling stop valve, it is characterized in that: on described piston flap (4), be axially arranged with the third channel (44) being communicated with limited impression (43) and opening slot (45), valve rod (5) and the contacting point of piston flap (4) form the four-way (72) being communicated with limited impression (43) and cylinder sleeve inner chamber (62).

8. high-pressure self-balance self-sealing piston formula according to claim 1 regulates throttling stop valve, and it is characterized in that: on piston flap (4), be provided with valve clack cover (7), valve rod (5) is connected with piston flap (4) by valve clack cover (7).

9. the high-pressure self-balance self-sealing piston formula according to any one of claim 1-8 regulates throttling stop valve, it is characterized in that: be connected with the indicating arm (8) being used to indicate valve rod (5) axial displacement on valve rod (5) top, and be placed in indicating arm (8) guard shield outward (81), and be arranged on the peep hole (82) on guard shield (81).

10. the high-pressure self-balance self-sealing piston formula according to any one of claim 1-8 regulates throttling stop valve, it is characterized in that: the handwheel (9) also comprising band ovable valve stem (5) axial motion.