阅读说明：本技术 高平台防火球阀 (High platform fire-proof ball valve ) 是由 徐周颖 于 2019-05-28 设计创作，主要内容包括：本申请公开了高平台防火球阀装置,包括阀体,阀盖,球体,阀座,聚四氟乙烯密封垫和高温石墨密封垫,所述阀座设于阀盖和球体之间,所述聚四氟乙烯密封垫和石墨密封垫均设于阀体和阀盖之间,且所述石墨密封垫设于所述聚四氟乙烯密封垫,进一步包括阀杆垫,阀杆,V型聚四氟乙烯填料压圈,填料垫,碟型弹簧,垫圈和螺纹压盖,所述螺纹压盖和填料室设于阀体和阀杆之间,且所述填料室设于所述螺纹压盖的下方,所述填料室由下而上依次包括V型聚四氟乙烯填料压圈,填料垫,蝶形弹簧和垫圈,该球阀采用多重防火结构,尽可能的避免了在火灾突发事故时,阀门的外漏引起的安全事故。(The application discloses a high platform fireproof ball valve device, which comprises a valve body, a valve cover, a ball body, a valve seat, a polytetrafluoroethylene sealing gasket and a high-temperature graphite sealing gasket, the valve seat is arranged between the valve cover and the ball body, the polytetrafluoroethylene sealing gasket and the graphite sealing gasket are both arranged between the valve body and the valve cover, the graphite sealing gasket is arranged on the polytetrafluoroethylene sealing gasket and further comprises a valve rod gasket, a valve rod, a V-shaped polytetrafluoroethylene packing pressing ring, a packing gasket, a disc-shaped spring, a gasket and a screw gland, the screw gland and the packing chamber are arranged between the valve body and the valve rod, the packing chamber is arranged below the screw gland and sequentially comprises a V-shaped polytetrafluoroethylene packing pressing ring, a packing pad, a belleville spring and a gasket from bottom to top, the ball valve adopts a multiple fireproof structure, and safety accidents caused by leakage of the valve when fire accidents happen are avoided as much as possible.)

1. High platform fire prevention ball valve, including valve body (1), valve gap (2), spheroid (3), valve seat (4), polytetrafluoroethylene sealed pad (5) and high temperature graphite sealed pad (6), valve seat (4) are located between valve gap (2) and spheroid (3), polytetrafluoroethylene sealed pad (5) and graphite sealed pad (6) are all located between valve body (1) and valve gap (2), just graphite sealed pad (6) are located the top of polytetrafluoroethylene sealed pad (5), its characterized in that, the ball valve device further includes valve rod pad (7), valve rod (8), V type polytetrafluoroethylene packing clamping ring (9), packing pad (10), disc type spring (11), packing ring (12) and screw gland (15), screw gland (15) and packing chamber are located between valve body (1) and valve rod (8), just the screw gland (15) below is located to the chamber, the packing chamber sequentially comprises a V-shaped polytetrafluoroethylene packing pressing ring (9), a packing pad (10), a belleville spring (11) and a gasket (12) from bottom to top, and a valve rod pad (7) is further arranged at the end part of the lower part of the valve rod.

2. the high platform fireproof ball valve is characterized in that a graphite ring (13) is arranged inside the screw gland (15), and a graphite pad (14) is arranged at the joint part of the thread root of the valve body (1) and the screw gland (15).

3. the high platform fireproof ball valve is characterized in that the valve seat (4) is made of polyparaphenylene, polyetheretherketone or tetrafluoroethylene.

4. The high-platform fireproof ball valve is characterized in that the cross section of the V-shaped polytetrafluoroethylene packing pressing ring (9) is V-shaped or rhombic.

5. The high platform fireproof ball valve is characterized in that four grooves are formed in the outline of the outer circle of the threaded gland (15).

Technical Field

The application relates to a ball valve, especially relate to high platform fire prevention ball valve

Background

If an electric or pneumatic actuator is needed to be adopted by the non-high platform ball valve, a support is additionally arranged on the upper part of the valve, the lower end of the support is connected with the valve, and the upper end of the support is connected with an electric or pneumatic actuating mechanism; and high platform ball valve, can directly be connected with pneumatic actuator or electric actuator, make the valve can carry out remote operation with pneumatic or electronic.

At present, the existing high platform ball valve packing in China is sealed by means of compression expansion of V-shaped packing under the pretightening force of two bolts on a packing gland according to a traditional packing gland type sealing structure. Because the pretightening force of the two pretightening bolts on the packing gland is not uniform in the assembling process before leaving a factory or in daily maintenance, the pretightening bolts can cause the leakage due to nonuniform stress. In addition, under bad working conditions and climates, the valve is used in the open air for a long time, the packing gland and the valve rod can be rusted and clamped, so that the operation torque of the valve is increased instantly, meanwhile, the packing gland and the valve rod are rusted and locked, if the packing leaks at the time, the bolt on the packing gland cannot be pre-tightened, and finally, the packing is leaked, so that the rescue cannot be realized.

As V-shaped polytetrafluoroethylene molding packing is used for sealing at the valve rod sealing position of all the existing high platform valves at home at present, once a fire accident happens, the upstream pressure medium can flow into the valve body middle cavity through the valve seat as little as possible only by virtue of the fireproof structure at the valve seat, so that the damage to the valve rod packing and the tetrafluoro sealing gasket at the valve cover connecting position of the valve body is reduced.

This application adopts a high platform fire prevention ball valve to above-mentioned technical problem, and this ball valve utilizes the unique high platform design to valve upper portion, makes the valve can directly be connected with electric actuator or pneumatic actuator, need not the support, and triple fire prevention design to valve key position simultaneously makes the valve can reach zero and leak outward when conflagration incident.

Disclosure of Invention

the utility model provides a high platform fire prevention ball valve is overcome prior art's not enough to the purpose, is provided. The ball valve comprises a first heavy fireproof structure, the first heavy fireproof structure is arranged between a valve cover and a ball body, once a fire accident happens and a valve seat is damaged, the ball body and a sealing surface at the fireproof position of the valve body can be subjected to metal-to-metal sealing, so that upstream pressure media flow into a middle cavity of the valve body through the valve seat as little as possible, and the damage to a polytetrafluoroethylene sealing gasket at the connecting position of a filler and the valve cover of the valve body is reduced; the second fireproof structure is arranged between the valve body and the valve cover, so that once a fire accident happens and the valve seat begins to be burnt, if a trace amount of high-temperature medium permeates into the valve cavity at the moment that the sealing surface of the valve cover is not rapidly attached to the ball body, a polytetrafluoroethylene gasket is designed according to the standard at the joint of the valve body and the valve cover, the high-temperature graphite gasket can play a role in sealing, and the leakage of the joint of the valve body and the valve cover caused by the fire can be avoided; triple fireproof structure, triple fireproof structure locates between valve rod and the screw gland, in case there is conflagration incident, when the packing that leads to V type polytetrafluoroethylene material begins to burn out, the graphite ring is add to screw gland's inside, can prevent the packing back of burning out, the medium leaks outward from the valve rod, a graphite pad has been add at valve body and screw gland's screw root laminating position simultaneously, the accessible is screwed up screw gland and is sealed, prevent that the medium from leaking outward from the screw thread, generally need not screw up at ordinary times, only under very emergency, just screw gland seals up, prevent that conflagration incident from leaking outward. In addition, four grooves are formed in the outer circle profile of the threaded gland, the threaded gland can be directly screwed up on line by using a hook-shaped wrench to increase compression of the V-shaped packing, and therefore long-term sealing of the packing position of the valve rod is guaranteed.

This application adopts multiple fire prevention structure, has avoided as far as when conflagration incident, the incident that the hourglass arouses of valve. This application adopts screw-threaded formula to seal (screw gland) in packing department, is different from traditional packing gland structure, has avoided because the inhomogeneous packing department that leads to of bolt pretightning force on the packing gland leaks. The recess that sets up on the screw gland, usable spanner fastens on line and prevents that valve rod department from leaking, because the inside graphite annulus that is equipped with of screw gland can play the lubrication action, so can not rust the card and die. In addition, the valve rod packing part is additionally provided with the disc spring, and meanwhile, the flat gaskets are additionally arranged on the upper part and the lower part of the disc spring, so that after the screw gland is screwed down, the pre-tightening force can be uniformly distributed on the V-shaped packing through the flat gaskets and the disc spring, and the phenomenon that the packing part leaks due to uneven stress of the traditional packing gland is avoided.

Drawings

FIG. 1 is a schematic structural view of a high platform fire-proof ball valve;

FIG. 2 is an enlarged view of a portion of the first heavy fire protection structure;

FIG. 3 is an enlarged view of a portion of the second secondary fire protection structure;

FIG. 4 is an enlarged view of a portion of a third triple fire protection feature;

FIG. 5 is a top view of the screw gland;

in the drawing, a valve body (1), a valve cover (2), a ball body (3), a valve seat (4), a polytetrafluoroethylene sealing gasket (5), a graphite sealing gasket (6), a valve rod gasket (7), a valve rod (8), a V-shaped polytetrafluoroethylene packing pressing ring (9), a packing gasket (10), a disc-shaped spring (11), a gasket (12), a graphite ring (13), a graphite gasket (14) and a screw thread gland (15).

Detailed Description

Fig. 1 is a schematic structural diagram of a high platform fire-proof ball valve. As shown in fig. 1, a high platform fire-proof ball valve device comprises a valve body (1), a valve cover (2), a ball body (3), a valve seat (4), a polytetrafluoroethylene sealing gasket (5) and a high-temperature graphite sealing gasket (6); fig. 2 is a partial enlarged view of the first heavy fire protection structure, as shown in fig. 2, the valve seat (4) is disposed between the valve cover (2) and the ball body (3), the valve seat (4) is made of polyparaphenylene, polyetheretherketone or tetrafluoroethylene, once there is a fire accident and the valve seat is damaged, the ball body and the sealing surface of the valve body fire protection part can be metal-to-metal sealed, so that the upstream pressure medium flows into the valve body middle cavity through the valve seat as little as possible, and the damage to the tetrafluoro gasket at the connection of the filler and the valve cover of the valve body is reduced. Fig. 3 is a partial enlarged view of the second double fireproof structure, as shown in fig. 3, the polytetrafluoroethylene sealing gasket (5) and the graphite sealing gasket (6) are both arranged between the valve body (1) and the valve cover (2), and the graphite sealing gasket (6) is arranged above the polytetrafluoroethylene sealing gasket (5). In case there is conflagration incident, when leading to the disk seat to begin to burn out, if in the twinkling of an eye that sealed face of valve gap has not laminated with the spheroid rapidly yet, have a trace high temperature medium infiltration valve pocket, at valve body valve gap junction this moment, except that according to polytetrafluoroethylene gasket of standard design, still add one high temperature graphite gasket, in case polytetrafluoroethylene gasket burns out, the high temperature graphite gasket can also play sealed effect, can avoid because the conflagration leads to the outer hourglass of valve body and valve gap junction.

The valve further comprises a valve rod gasket (7), a valve rod (8), a V-shaped polytetrafluoroethylene packing pressing ring (9), a packing gasket (10), a disc-shaped spring (11), a gasket (12), a graphite ring (13), a graphite pad (14) and a threaded gland (15); fig. 4 is a partial enlarged view of a third triple fireproof structure, as shown in fig. 4, the screw gland (15) and the packing chamber are arranged between the valve body (1) and the valve rod (8), the packing chamber is arranged below the screw gland (15), the packing chamber sequentially comprises a V-shaped polytetrafluoroethylene packing pressing ring (9), a packing pad (10), a belleville spring (11) and a gasket (12), the cross section of the V-shaped polytetrafluoroethylene packing pressing ring (9) is V-shaped or rhombic, and in addition, a valve rod pad (7) is arranged at the lower end of the valve rod. In case there is conflagration incident, when leading to the packing of V type polytetrafluoroethylene material to begin to burn out, graphite ring (13) have been add to the inside of screw gland (15), can prevent the packing back that burns out, the medium leaks outward from the valve rod, graphite pad (14) have been add to the screw root laminating position of valve body (1) and screw gland (15) simultaneously, the accessible is screwed up screw gland and is sealed, prevent that the medium from leaking outward from the screw thread, generally need not screw up at ordinary times, only under very emergency, just screw gland is screwed up and is sealed, prevent that conflagration incident from leaking outward. In addition, as shown in fig. 5, four grooves are arranged on the outer circle profile of the screw gland (15), and the screw gland can be directly screwed on line by using a hook-shaped wrench to increase the compression of the V-shaped packing, so that the long-term sealing of the valve rod packing is ensured.