CN220102153U - Hard and soft dual-seal switching stop valve with cage type detachable and replaceable valve seat - Google Patents

Abstract

The utility model discloses a hard and soft dual-seal conversion stop valve (one inlet and two outlets) with a cage-type valve seat capable of being detached and replaced; the switching valve is used to connect the two safety valves to the pressure system via a pipe connection to improve the operational usability. One safety valve is in an operating state and one safety valve is in a standby state. The changeover valve is used to ensure uninterrupted operation of the plant or pipeline, and the backup safety valve can be removed and serviced or set-up pressure adjusted, for example, during operation the pressure system continues to be protected from impermissible pressure damaging the plant. In this way, the downtime of the equipment or pipeline can be planned independently of the maintenance cycle of the safety valve, meeting the production needs. The sealing pair is hard and soft dual-sealing, so that the sealing reaches zero leakage, and the sealing ring and the valve seat are convenient to maintain and replace.

Description

Hard and soft dual-seal switching stop valve with cage type detachable and replaceable valve seat

Technical Field

The utility model relates to the technical field related to a switching valve, in particular to a hard and soft double-seal switching stop valve with a cage type and a detachable and replaceable valve seat.

Background

Switching valves are used to ensure uninterrupted operation of equipment or piping, primarily for these industries: petrochemical, oil and gas industries, technical gases, chemical industries, refrigeration, and the like. The existing conversion valve is sealed in a hard way, one is that two valve seats are directly machined on a valve body, and once a sealing pair is damaged and leakage occurs, the valve needs to be replaced, so that the use cost is high; the other is that the valve seat is pressed on the valve body by the short circuit of the outlet end, the center lines of the two valve seats are not on the same shaft, a certain included angle is formed, the production and manufacturing cost is high, when the valve is required to be replaced, the valve is required to be detached from the device, the maintenance and the replacement are inconvenient, and most importantly, when the valve is used for dangerous media such as natural gas, only a hard sealing pair is needed, the valve is required to be sealed to achieve zero leakage, the valve is not easy to reach, and safety accidents are easy to occur.

Disclosure of Invention

Therefore, in order to solve the defects, the utility model provides the hard and soft double-seal switching stop valve with the cage type and the detachable replaceable valve seat. The sealing pair is hard and soft dual-sealing, so that the sealing reaches zero leakage, and the sealing ring and the valve seat are convenient to maintain and replace.

The utility model is realized in such a way, a hard and soft dual-seal conversion stop valve with a cage-type and detachable valve seat is constructed, and the utility model is characterized in that; having an inlet, two outlets; the bent short circuit (1) is fixedly connected to the bottom of the valve body (12) through the full-thread stud A (2) and the nut A (3); the inlet of the straight-through short joint (7) is fixedly connected with the side surface of the valve body (12) through a nut (10) and a full-thread stud B (11); the same as the straight-through short circuit (7) is fixedly connected to the side surface of the valve body (12) through a nut D (40) and a full-thread stud D (41). The valve seat (4), the valve core sleeve (9), the pressing sleeve (16) and the valve cover (19) are fixedly connected to the inner cavity of the valve body (12) through the nut C (20) and the full-thread stud C (21); the hand wheel (30) is connected with the valve core (8) through the valve rod (14); the switching stop valve is provided with an inlet, two outlets (one outlet is closed and the other outlet is opened), two soft sealing pairs (a triangular sealing ring 6 and a triangular sealing ring 43) and two hard sealing pairs (50 and 51, 52 and 53) to form a hard soft sealing; the upper and lower sealing pair centers are on the same axis, and are also on the same axis with the valve rod (14) and the valve core (8) (the upper and lower end surfaces are provided with build-up welding STL sealing pairs 51/53); the valve rod (14) is in threaded connection with the valve core (8), the ball head is in contact with the valve core, and the valve core locking ring (13) is locked; the valve rod (14) is a lifting valve rod which moves up and down to drive the valve core (8) to move up and down, when the lower channel is closed, the valve core (8) is in overlaying welding of the STL sealing pair B (51) to be contacted with the triangular sealing ring (6), the triangular sealing ring (6) is arranged in a triangular dovetail groove formed by combining the valve seat (4) and the valve core sleeve (9), when the valve rod (14) drives the valve core (8) to move down continuously, the triangular sealing ring (6) is compressed to a certain amount, soft sealing between the overlaying welding of the STL sealing pair B (51) and the triangular sealing ring (6) is realized, meanwhile, the overlaying welding of the STL sealing pair B (51) and the overlaying welding of the STL sealing pair A (50) is realized, and hard sealing is realized, so that hard and soft sealing is realized, and zero leakage of the switching valve is ensured, especially important in dangerous environments such as natural gas; when the lower channel is closed, medium enters the valve body cavity (45) from the inlet, then enters the upper channel cavity (48) through the upper channel hole (44) and the upper annular channel (47) of the sleeve, and the upper channel hole (49) is connected with the outlet; when the upper channel is closed, a medium enters the valve cavity (45) from the inlet and then enters the outlet end through the lower channel hole of the sleeve (46), when the upper channel is closed, the surfacing STL sealing pair C (52) of the valve core (8) is contacted with the triangular sealing ring (43), the triangular sealing ring (43) is in a triangular dovetail groove formed by combining the pressing sleeve (16) and the valve core sleeve (9), when the valve rod (14) drives the valve core (8) to move upwards continuously, the triangular sealing ring (43) is compressed to a certain amount, the soft sealing between the surfacing STL sealing pair C (52) and the triangular sealing ring (43) is realized, meanwhile, the surfacing STL sealing pair C (52) is contacted with the surfacing STL sealing pair D (53) to realize hard sealing, so that the hard and soft sealing is achieved, and zero leakage of the upper channel of the switching valve is ensured.

The utility model relates to a hard and soft dual-seal switching stop valve with a cage type and a detachable and replaceable valve seat, which is characterized in that; the valve rod (14), the valve cover (19), the filler (22) and the O-shaped ring C (39) form a sealing structure, the 2O-shaped rings C (39) are sealed with the valve rod (14) and the valve cover (19) twice, the valve rod (14), the valve cover (19) and the filler (22) are sealed for the third time, the zero leakage of sealing can be ensured, and the practical use effect is good.

The utility model relates to a hard and soft dual-seal switching stop valve with a cage type and a detachable and replaceable valve seat, which is characterized in that; the sealing of the valve cover (19) and the valve body (12) is realized by an O-shaped ring A (17) and an O-shaped ring B (18); the axial assembly and stress conditions are as follows: the valve cover (19) acts on the pressing sleeve (16), the pressing sleeve (16) acts on the valve core sleeve (9), the valve core sleeve (9) acts on the valve seat (4), and the valve seat (4) acts on the valve body (12).

The utility model relates to a hard and soft dual-seal switching stop valve with a cage type and a detachable and replaceable valve seat, which is characterized in that; the hand wheel (30) is in threaded connection with the copper nut (28), and the locking ring (31) is locked; thrust ball bearings (27) are arranged at two ends of the copper nut (28), the copper nut (28) is in left-handed threaded connection with the valve rod (14), and when the hand wheel (30) rotates with the copper nut (28), the valve rod (14) moves up and down to drive the valve core (8) to move to an up-down closing position to realize closing or opening of the valve.

The utility model has the following advantages: the utility model provides a hard and soft double-sealing conversion stop valve (one inlet and two outlets) with a cage-type removable replaceable valve seat through improvement; the switching valve is used to connect the two safety valves to the pressure system (fig. 8) via a pipe connection to improve the operational usability. One safety valve is in an operating state and one safety valve is in a standby state. The changeover valve is used to ensure uninterrupted operation of the plant or pipeline, and the backup safety valve can be removed and serviced or set-up pressure adjusted, for example, during operation the pressure system continues to be protected from impermissible pressure damaging the plant. In this way, the downtime of the equipment or pipeline can be planned independently of the maintenance cycle of the safety valve, meeting the production needs. The sealing pair is hard and soft dual-sealing, so that the sealing reaches zero leakage, and the sealing ring and the valve seat are convenient to maintain and replace.

Drawings

FIG. 1 is an overall view of the present utility model (closed lower channel block diagram);

FIG. 2 is an overall view of the present utility model (closed upper channel block diagram);

FIG. 3 is a corresponding closed lower channel seal block diagram;

FIG. 4 is a corresponding partial diagram of the seal structure of the open lower channel;

FIG. 5 is a corresponding partial view of a closed upper channel seal structure;

fig. 6 is a corresponding partial diagram of an upper channel sealing structure opening;

fig. 7 is a partial diagram of a valve stem bonnet packing seal structure;

fig. 8 is a schematic diagram of the installation of the corresponding switching valve.

Wherein: the valve comprises a bent short circuit 1, a full-thread stud A2, a nut A3, a valve seat 4, an O-shaped ring 5, a triangular sealing ring 6, a straight short circuit 7, a valve core 8, a valve core sleeve 9, a nut B10, a full-thread stud B11, a valve body 12, a valve core locking ring 13, a valve rod 14, an O-shaped ring 15, a pressing sleeve 16, an O-shaped ring A17, an O-shaped ring B18, a valve cover 19, a nut C20, a full-thread stud C21, a filler 22, a filler gland 23, a bracket 24, a copper sleeve 25, a bearing steel pad 26, a thrust ball bearing 27, a copper nut 28, a locking nut 29, a hand wheel 30, a locking ring, a valve body 13 and a valve cover 19 the protection cover 32, the inner hexagonal cone end set screw 33, the guide flat key 34, the cross countersunk head screw 35, the upper and lower switch position indicating ruler 36, the cross countersunk head screw 37, the pointer 38, the O-shaped ring C39, the nut D40, the full-thread stud D41, the O-shaped ring 42, the triangular sealing ring 43, the sleeve upper channel hole 44, the valve body cavity 45, the sleeve lower channel hole 46, the upper annular channel 47, the upper channel cavity 48, the upper channel hole 49, the overlaying STL sealing pair A50, the overlaying STL sealing pair B51, the overlaying STL sealing pair C52 and the overlaying STL sealing pair D53.

Detailed Description

The following detailed description of the present utility model will provide clear and complete description of the technical solutions of embodiments of the present utility model, with reference to fig. 1-8, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model provides a hard and soft double-sealing conversion stop valve (one inlet and two outlets) with a cage-type removable replaceable valve seat through improvement; the bent short circuit 1 is fixedly connected to the bottom of the valve body 12 through the full-thread stud 2 and the nut A3; the straight-through short circuit 7 (inlet) is fixedly connected to the side surface of the valve body 12 through a nut 10 and a full-thread stud B11; the same as the through short 7 is fixedly connected to the side of the valve body 12 through a nut D40 and a full-thread stud D41. The valve seat 4, the valve core sleeve 9, the pressing sleeve 16 and the valve cover 19 are fixedly connected to the inner cavity of the valve body 12 through a nut C20 and a full-thread stud C21, and the hand wheel 30 is connected with the valve core 8 through the valve rod 14.

The switching valve is used to connect the two safety valves to the pressure system (fig. 8) via a pipe connection to improve the operational usability. One safety valve is in an operating state and one safety valve is in a standby state. The changeover valve is used to ensure uninterrupted operation of the plant or pipeline, and the backup safety valve can be removed and serviced or set-up pressure adjusted, for example, during operation the pressure system continues to be protected from impermissible pressure damaging the plant. In this way, the downtime of the equipment or pipeline can be planned independently of the maintenance cycle of the safety valve, meeting the production needs.

Switching valves are used to ensure uninterrupted operation of equipment or piping, primarily for these industries: petrochemical, oil and gas industries, technical gases, chemical industries, refrigeration, and the like.

The characteristics are as follows: the sealing pair is hard and soft dual-sealing, so that the sealing reaches zero leakage, and the sealing ring and the valve seat are convenient to maintain and replace. The existing conversion valve is sealed in a hard way, one is that two valve seats are directly machined on a valve body, and once a sealing pair is damaged and leakage occurs, the valve needs to be replaced, so that the use cost is high; the other is that the valve seat is pressed on the valve body by the short circuit of the outlet end, the center lines of the two valve seats are not on the same shaft, a certain included angle is formed, the production and manufacturing cost is high, when the valve is required to be replaced, the valve is required to be detached from the device, the maintenance and the replacement are inconvenient, and most importantly, when the valve is used for dangerous media such as natural gas, only a hard sealing pair is needed, the valve is required to be sealed to achieve zero leakage, the valve is not easy to reach, and safety accidents are easy to occur.

The structure characteristics of the switching valve are as follows: the hand wheel 30 is in threaded connection with the copper nut 28, and the locking ring 31 is locked. Thrust ball bearings 27 are arranged at two ends of the copper nut 28, the copper nut 28 is in left-handed threaded connection with the valve rod 14, and when the hand wheel 30 rotates with the copper nut 28, the valve rod 14 moves up and down to drive the valve core 8 to move to an up-down closing position, so that the valve is closed or opened.

The sealing structure of the switching valve is characterized in that: there is one inlet, two outlets (one is closed while the other is opened), two soft sealing pairs (triangle 6, triangle 43) and two hard sealing pairs (50 and 51, 52 and 53) forming a hard soft double seal. The upper and lower sealing pair centers are on the same axis, and are also on the same axis with the valve rod 14 and the valve core 8 (the upper and lower end surfaces are provided with build-up welding STL sealing pairs 51/53). The valve rod 14 is in threaded connection with the valve core 8, the ball head is contacted, and the valve core locking ring 13 is locked. The valve rod 14 is a lifting valve rod which moves up and down to drive the valve core 8 to move up and down, when the lower channel is closed, the surfacing STL sealing pair B51 of the valve core 8 is firstly contacted with the triangular sealing ring 6, the triangular sealing ring 6 is arranged in a triangular dovetail groove formed by combining the valve seat 4 and the valve core sleeve 9, when the valve rod 14 drives the valve core 8 to move down continuously, soft sealing between the surfacing STL sealing pair B51 and the triangular sealing ring 6 is realized, meanwhile, the surfacing STL sealing pair B51 is contacted with the surfacing STL sealing pair A50 to realize hard sealing, so that hard and soft sealing is realized, and zero leakage of the switching valve is ensured to be closed, and especially, the valve is more important in dangerous environments such as natural gas. When the lower passageway is closed (fig. 1), medium enters the valve body chamber 45 from the inlet, passes through the sleeve upper passageway 44 and the upper annular passageway 47, enters the upper passageway chamber 48, and the upper passageway 49 is connected to the outlet. When the upper passageway is closed (fig. 2), medium enters the valve body chamber 45 from the inlet and passes through the lower passageway of the sleeve 46 to the outlet end.

When the upper channel is closed, the surfacing STL sealing pair C52 of the valve core 8 is contacted with the triangular sealing ring 43 firstly, the triangular sealing ring 43 is in a triangular dovetail groove formed by combining the pressing sleeve 16 and the valve core sleeve 9, when the valve rod 14 drives the valve core 8 to move upwards continuously, the triangular sealing ring 43 is compressed to a certain amount, soft sealing of the surfacing STL sealing pair C52 and the triangular sealing ring 43 is realized, meanwhile, the surfacing STL sealing pair C52 is contacted with the surfacing STL sealing pair D53, hard sealing is realized, and therefore, hard and soft sealing is realized, and zero leakage of the upper channel of the switching valve is ensured to be closed.

As in fig. 7: the sealing structure of the valve rod 14, the valve cover 19, the packing 22 and the O-shaped ring C39 realizes two sealing with the valve rod 14 and the valve cover 19, and the valve rod 14, the valve cover 19 and the packing 22 realize a third sealing, thereby ensuring zero leakage of sealing and having good practical use effect.

The sealing of the valve cap 19 to the valve body 12 is achieved by an O-ring a17 and an O-ring B18. The axial assembly and stress conditions are as follows: the valve cap 19 acts on the pressure sleeve 16, the pressure sleeve 16 acts on the valve core sleeve 9, the valve core sleeve 9 acts on the valve seat 4, and the valve seat 4 acts on the valve body 12.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. A hard and soft dual-seal switching stop valve with a cage-type detachable and replaceable valve seat is characterized in that; having an inlet, two outlets; the bent short circuit (1) is fixedly connected to the bottom of the valve body (12) through the full-thread stud A (2) and the nut A (3); the straight-through short circuit (7) is fixedly connected to the side face of the valve body (12) through a nut B (10) and a full-thread stud B (11); the same as the straight-through short circuit (7) is fixedly connected to the side surface of the valve body (12) through a nut D (40) and a full-thread stud D (41); the valve seat (4), the valve core sleeve (9), the pressing sleeve (16) and the valve cover (19) are fixedly connected to the inner cavity of the valve body (12) through the nut C (20) and the full-thread stud C (21); the hand wheel (30) is connected with the valve core (8) through the valve rod (14);

the switching stop valve is provided with an inlet, two outlets, two soft sealing pairs and two hard sealing pairs, so that a hard and soft sealing is formed; the upper and lower sealing auxiliary centers are on the same axis, and are also on the same axis with the valve rod (14) and the valve core (8); the valve rod (14) is in threaded connection with the valve core (8), the ball head is in contact with the valve core, and the valve core locking ring (13) is locked; the valve rod (14) is a lifting valve rod which moves up and down, the valve core (8) is driven to move up and down, when the lower channel is closed, the valve core (8) is in overlaying welding STL sealing pair B (51) firstly contacts with the triangular sealing ring (6), the triangular sealing ring (6) is in a triangular dovetail groove formed by combining the valve seat (4) and the valve core sleeve (9), when the valve rod (14) drives the valve core (8) to move down continuously, the triangular sealing ring (6) is compressed to a certain amount, soft sealing between the overlaying welding STL sealing pair B (51) and the triangular sealing ring (6) is realized, and meanwhile, the overlaying welding STL sealing pair B (51) is in contact with the overlaying welding STL sealing pair A (50).

2. The hard and soft dual-seal switching shut-off valve of claim 1, wherein the valve seat is removable and replaceable; the valve rod (14), the valve cover (19), the filler (22) and the O-shaped ring (39) form a sealing structure, two sealing is realized by the 2O-shaped rings (39) and the valve rod (14) and the valve cover (19), and a third sealing is realized by the valve rod (14), the valve cover (19) and the filler (22).

3. The hard and soft dual-seal switching shut-off valve of claim 1, wherein the valve seat is removable and replaceable; the sealing of the valve cover (19) and the valve body (12) is realized by an O-shaped ring A (17) and an O-shaped ring B (18); the axial assembly and stress conditions are as follows: the valve cover (19) acts on the pressing sleeve (16), the pressing sleeve (16) acts on the valve core sleeve (9), the valve core sleeve (9) acts on the valve seat (4), and the valve seat (4) acts on the valve body (12).

4. The hard and soft dual-seal switching shut-off valve of claim 1, wherein the valve seat is removable and replaceable; the hand wheel (30) is in threaded connection with the copper nut (28), and the locking ring (31) is locked; thrust ball bearings (27) are arranged at two ends of the copper nut (28), the copper nut (28) is in left-handed threaded connection with the valve rod (14), and when the hand wheel (30) rotates with the copper nut (28), the valve rod (14) moves up and down to drive the valve core (8) to move to an up-down closing position to realize closing or opening of the valve.