77results about How to "Easy online maintenance" patented technology

The invention discloses an ETS protective unit and a triply-redundant steam turbine emergency protection system. The ETS protective unit and the triply-redundant steam turbine emergency protection system are highly reliable and easy to use. The ETS protective unit is used in the steam turbine emergency protection system and comprises a processor and an AND gate circuit, an FPGA is adopted by the processor, three protective logic modules are arranged in the processor, the ETS protective unit receives shutdown signals of a steam turbine, the three protective logic modules in the processor respectively conduct the protective logic operation on the signals, level signals of three branches of operation results are transmitted to the AND gate circuit for AND logic, and protective motion signals are output. The three protective logic modules are utilized by the ETS protective unit for respectively performing the operation, the logic level 1 is output respectively for expressing that an ETS shuts down, AND taking logics output by the three protective logic modules finally drive the shutdown DO of the ETS protective unit to be output, and therefore the false action probability of an ETS system is greatly reduced.

The invention discloses a three-machine three-strand slab continuous casting machine production line which is specially matched with the rapid smelting period of a large converter. Three water outlets are formed in the bottom of an intermediate tank of the production line. A one-strand slab continuous casting machine is correspondingly arranged on the lower portion of each water outlet. The two sides, in the inner and outer arc direction, of each vibration device are each provided with a vibration oil cylinder and leaf springs, wherein the two vibration oil cylinders are set to be the same in motion stroke, and the leaf springs are set to be the same in mounting angle. All loads of the vibration devices are transmitted to a secondary cooling chamber concrete wall through vibration supporting structures. Sector segment transmission devices of the casting machines on the left side and the right side are arranged outside the secondary cooling chamber concrete wall, and motors and speed reducers are directly connected with drive rollers of horizontal sector segments through couplers. A transmission device of the middle slab continuous casting machine is a suspended transmission device. Productivity can be obviously increased, existing two-strand continuous casting machines can be conveniently modified into three-machine three-strand continuous casting machines, the process layout is compact, and the economic performance is excellent.

The invention provides a real-time detection control system based on HFC network equipment and a detection control method thereof, wherein the real-time detection control system comprises a real-timecontrol detection device, a network management server and a client, wherein the real-time control detection device is used for detecting and controlling the HFC network equipment in real time; the network management server complete control management at an upper layer; the real-time control detection device partially adopts the corresponding detection control method based on DSP and PGA technologies to carry out fully digital signal transmission, and when terminal equipment in an HFC network completes register on the real-time control detection device, the real-time control detection device can process the inquiry of the network management server on the own working state of a front end, can also receive and process orders, i.e. various GET, SET, and the like which are distributed from theupper-layer network management server and remotely control managed equipment. Compared with the traditional technology, the invention well solves the problems of frequency drift and error rate in thewhole detection control process so that the real-time detection control system can be operated in a high-temperature severe environment, and can still ensure the accurate detection control even if a larger noise signal exists in the network.

The invention discloses a liquefied natural gas sampling and continuous collecting device, which comprises a sampling system, a gasification system, an on-line analysis system and a continuous collecting system, wherein the sampling system comprises an LNG sampling probe, a sampling pipeline and an LNG filling pipeline; a closed deep cooling cavity is formed at the front end of the LNG sampling probe; the sampling pipeline is arranged in the LNG sampling probe in a penetrating manner; the LNG filling pipeline is arranged in the LNG sampling probe in a penetrating mode and communicates with a closed deep cooling cavity; one end of the sampling pipeline penetrates through the closed deep cooling cavity and is connected to the gasification system; the gasification system is used for gasifyingan LNG sample conveyed by the sampling pipeline; the on-line analysis system is connected to an outlet of the gasification system and is used for carrying out on-line analysis on a gasified natural gas sample and providing gas component parameters; and the continuous collecting system is connected to the outlet of the gasification system and is used for continuously collecting the gasified natural gas samples.

The invention discloses a top-mounted type ball valve on-line maintenance assembling and disassembling device. The top-mounted type ball valve on-line maintenance assembling and disassembling device comprises two maintenance assembling and disassembling device bodies with the same structures, wherein the two maintenance assembling and disassembling device bodies are symmetric to each other in the left-right direction; each maintenance assembling and disassembling device body comprises a limiting plate, a stud, an adjustable pad, a hexagon nut, an inclined adjustable rod, an adjusting nut, a movable footstock and a fixed footstock; each limiting plate is fixed on a flange in an assembled valve body via the corresponding stud; each adjustable pad is arranged above the corresponding limiting plate; each hexagon nut is arranged above the corresponding adjustable pad; one end of each inclined adjustable rod penetrates in the corresponding limiting plate and can move in the corresponding limiting plate in the up-down direction; the lower end of each inclined adjustable rod is a trapezoidal end; a left side surface of each trapezoidal end is an inclined surface which extends towards the direction of a vertical central axis of the corresponding inclined adjustable rod; a right side surface of each trapezoidal end is a horizontal surface; guiding mechanisms which are distributed longitudinally are respectively arranged on the left side surface and the right side surface of each trapezoidal end; each adjusting nut is used for fixing the corresponding inclined adjustable rod and adjusting the corresponding inclined adjustable rod in the up-down direction; each movable footstock is movably arranged on the left side surface of the corresponding trapezoidal end; and each fixed footstock is movably arranged on the right side surface of the corresponding trapezoidal end. The top-mounted ball valve on-line maintenance assembling and disassembling device is simple in structure; and by the top-mounted ball valve on-line maintenance assembling and disassembling device, a top-mounted type ball valve is quite convenient to assemble and disassemble.

The invention relates to an array flow velocity control valve structure suitable for incompressible fluid. The structure comprises a valve body, a valve base, valve cores, an upper cover and valve rods, wherein the base valve is arranged in the valve body, a plurality of throttle slices are arranged installed on the valve base, the throttle slices are positioned through positioning pins, each of the throttle slices comprises a parallel thin plate body and a rhombic pillar-shaped array structure, a guide base is installed on the throttle slices, balancing sealing rings are installed in the guide base, valve cores are installed in the throttle slices, the valve cores are connected with the valve rods, and the upper cover is installed on the valve body; and the upper cover is fixed on the valve body through a screw bolt and a nut. According to the structure, the fluid pressure is kept to be above the saturated vapor pressure, bubbles are avoided, and a cavitation phenomenon is eliminated; damages of inner parts of a valve, which are caused by energy blasting energy, are reduced; the valve is convenient to disassemble and clean, and on-line maintenance is facilitated; and the pressure is reduced step by step through flow rate control of high-speed incompressible fluid, the cavitation phenomenon is avoided, and the normal operation of the valve is guaranteed.

The invention relates to a hard sealing lifting type brake plug valve and a control method thereof. The hard sealing lifting type brake plug valve comprises a valve body, a valve seat, a valve plug, a valve rod, a gasket, a valve deck, studs, pins, a packing bushing, swing bolts, a packing pressing plate, swing bolts, a hand wheel, a hand wheel gasket, a nut, packing and a valve rod nut. The valve body and the valve deck are connected through the studs. The valve deck and the packing pressing plate are connected through the swing bolts. The valve rod is connected with the valve plug through a head flat-square part. A full-bore partial-rotation structure is adopted, the flow coefficient is large, and the opening and closing space is small. The metal-sealing, fireproof, anti-static and blowout prevention valve rod structure is adopted, and the hard sealing lifting type brake plug valve is suitable for high-temperature-resistant, high-pressure-resistant and strong-corrosion-resistant working conditions and is wide in application range. The packing structure can be replaced on line, and online maintenance is convenient. During operation, a sealing pair is disengaged, friction between opening and closing torque and the sealing pair is reduced, and the service life of the valve is prolonged.

The invention discloses a vacuum rainwater drainage system and a method. The system comprises a pump room, a water colleting tank, a water inlet pipe, a water outlet pipe and a water drainage river channel, wherein one end of the pump room is connected with the water colleting tank through the water inlet pipe, and the other end is connected with the water drainage river channel through a water outlet pipe; an electrical control unit and at least one vacuum control pump group is arranged in the pump room, and the electrical control unit controls the vacuum control pump group; and a liquid level measurement unit is arranged in the water collecting tank, and the liquid level measurement unit outputs signals to the electrical unit. The system and the method have the advantages that the starting of the pump unit requires no filling water, and the working efficiency is high; and the operation vibration of the device is low, and the failure rate is low; connecting pipes can be turned around, underground structures can be avoided, and the problem that construction is hard due to underground pipe networks are complex is solved effectively; capacity of a variable frequency regulation pump can be detected through a double-acting liquid level, and the performance of the system is reliable; and after the system control is upgraded, unmanned management of a pump station can be achieved, and management and human resource costs are saved.

The invention discloses a modular aerating / oxygenating device, and belongs to the field of environment protection equipment. The device comprises aerators, a square frame, a gas distribution pipe, gas distribution adapters, counterweights, buoys, an end fixing member, and riggings; multiple aerators are parallelly arranged in the square frame, one end of each aerator is connected to a gas distribution adapter, the gas adapters are connected to the gas distribution pipe, the other end of each aerator is sealed and fixed on the square frame; the counterweights are fixed under the four corners of the square frame through the riggings, and the other end of each rigging is provided with a buoy. The provided device can be used to treat polluted water body in the nature by oxygenating the water body, and is capable of being applied to the aeration system in the industries such as aquaculture, sewage treatment, and the like. The device can be installed in the water, which needs to be oxygenated, or the device can be installed on the bottom of a container containing water to be processed. The installation is simple, and the maintenance and exchanging are both very convenient. The device is composed of a plurality of modules, the combination is flexible, so the device can be used under different occasions, moreover, the production process is simplified due to the modular design, and the cost is very low.

The invention discloses an S-mode integrated interrogator, which is used for solving the problems that an interrogator is large in size, large in occupied cabinet space, complex in interface, variousin signal variety, large in debugging difficulty and high in cost. The S-mode integrated interrogator comprises a transmitter, a transmitting monitoring unit, a receiver, a digital intermediate frequency unit and a transceiving power supply, wherein the transmitter is used for carrying out power amplification on a modulated signal and generating a radio frequency inquiry signal, the transmitting monitoring unit is used for monitoring the working state of the transmitter, controlling the working parameters of the transmitter and filtering the radio frequency inquiry signal to output an uplink inquiry signal, and the receiver is used for down-converting three paths of input 1090MHz sigma, delta and omega radio frequency response signals into three paths of 60MHz intermediate frequency signals, and modulating the inquiry pulse signal and the test pulse signal to generate a sigma excitation signal, an omega excitation signal and a radio frequency test signal. According to the invention, the equipment integration degree is improved, the internal signal interface is simplified, the cost is reduced, and the adjustment of the interrogator is facilitated.

The invention relates to a switching-on and switching-off method for a pipeline check valve and gate valve combination. The switching-on and switching-off method is characterized in that a check valveand a gate valve are arranged to be combined with valve elements in a coaxial or crossing or concentric or perpendicular or face-to-face or symmetrical or independent or rotary manner on a pipeline;and the check valve and gate valve combination is composed of a medium, a medium inlet pipeline, a valve body I, a medium outlet pipeline, a valve element valve rod I, a valve element valve rod II, fastening bolts, the valve element I, the valve element II and a valve body II. The switching-on and switching-off method capable of achieving multiple pipeline valve combination forms has the advantages that the structure is simple, operation is flexible to conduct, and maintenance and replacement are convenient to conduct. The problems of on-line maintenance, valve body and valve element replacement and the like are solved under the precondition that flowing of the medium of the power pipeline is not affected. Effective paths for on-line valve and valve element replacement are enriched.

The invention relates to a backup battery maintenance method, device and system and a storage medium. In the backup battery maintenance method, a control unit detects a power supply unit according toan externally transmitted discharge maintenance instruction, and when the power supply unit meets a discharge maintenance condition, a controllable power supply switches a mains supply of a power supply of communication equipment to a backup battery, so that the backup battery discharges through the communication equipment. And meanwhile, the control unit monitors the discharge process of the backup battery through the controllable power supply, and when the backup battery is completely discharged, the controllable power supply starts the mains supply to supply power to the communication equipment and charges the backup battery. The backup battery takes communication equipment needing to be powered as a discharge load, so that no extra load is needed, and the maintenance cost is reduced; and moreover, the controllable power supply controls the connection and disconnection of the commercial power, thereby achieving the charging and discharging maintenance of the backup battery, facilitating the online maintenance of the backup battery, saving the manpower and material resources, and effectively prolonging the service life of the backup battery.

The invention provides a solid particulate matter heat storage and release device. The device is characterized in that a heat exchange pipe is arranged inside a heat storage and exchange container, aheat storage medium is arranged in the heat storage and exchange container and is located outside the heat exchange pipe, a heat exchange medium is circulated inside the heat exchange pipe, the heat storage medium is solid particulate matter such as sand, coal ash or coal slag. The invention further provides a solid particulate matter heat storage and release system. The system is characterized inthat the solid particulate matter heat storage and release devices are designed in a modular mode, and are divided into multiply layers in the vertical direction according to the temperature gradient, the multiple groups of the solid particulate matter heat storage and release devices are arranged at each layer in the horizontal direction, the heat exchange pipes of the solid particulate matter heat storage and release devices of the adjacent layers of the same group are connected end to end through connecting pipes, the free end of the heat exchange pipe at the bottommost layer of each groupis connected with a low-temperature medium mater pipe, and the free end of the heat exchange pipe at the uppermost layer of each group is connected with a high-temperature medium master pipe. The invention further provides a solid particulate matter heat storage and release method. The method is characterized in that a bidirectional flow design is adopted, the heat exchange medium flows from topto bottom during heat storage, and the heat exchange medium flows from bottom to top during heat release. According to the device, the system and the method, the system is simple, the maintenance is convenient, the cost is low, and the application range is wide.

The invention belongs to the technical field of a check valve of a nuclear power unit and particularly relates to a bypass check valve for a containment isolation system. The check valve disclosed by the invention comprises a valve body (1), a valve cover (11), a valve element (5), a valve flap (2) and a hold-down spring (6); the valve cover (11) is connected to the upper part of the valve body (1) by screw threads; the valve element (5), a valve cavity input passage and a valve cavity output passage are arranged inside the valve body (1); the lower end of the valve element (5) sleeved with the hold-down spring (6) is provided with the valve flap (2); and a section capable of being closed is formed by the valve flap (2) and the valve body (1). The check valve disclosed by the invention is effectively controlled to be opened and closed by arrangement of the hold-down spring and not only can meet the pressure relief requirement under an overpressure condition, but also can meet the sealing requirement under a static condition; moreover, the check valve disclosed by the invention can be installed on horizontal pipelines, vertical pipelines and pipelines with inclination angles and meets the requirement of changeability of the pipelines on site.

The invention relates to a processing method of a butterfly valve sealing mechanism. A butterfly valve comprises a valve body, a butterfly plate and a valve rod, wherein a shaft hole is arranged in the valve body, the valve rod passes through the shaft hole to be fixedly connected with the butterfly plate, and the valve body and the butterfly plate are matched for forming a path capable of being opened and closed. The processing method comprises the following steps that a circle of annular groove is arranged on the valve body, the forming position of the groove is positioned on the valve body corresponding to the circumference surface of the butterfly plate in the closed state, at least one hole is arranged in the valve body, and in addition, the hole is communicated with the groove; the outer circumference surface of one annular sealing ring is made into a dovetail groove shape for forming a circular of dovetail groove shape edge part, an opening of the dovetail groove shape edge part of the sealing ring is inserted in a direction of facing the bottom surface of the groove, the butterfly plate is closed, in addition, resin is injected into the groove through the hole until the sealing ring and the butterfly plate are completely sealed; and the hole is sealed, the resin is cured, and finally, the processing of the sealing mechanism is completed. The structure of the groove and the sealing ring is used for realizing the sealing with the valve body and the butterfly plate, the structure is simple, the sealing effect is good, and the processing and the on-line maintenance are convenient.

The invention relates to an adduction disc type pipeline angle valve capable of being adjusted to be opened and closed, which is mainly connected with an angle valve body through a positioning step at the upper end of a valve seat, the angle valve body, the valve seat, a sealing gasket and a T-pipe are fixed by valve body studs and valve body nuts, the top end of the valve rod penetrates through an upper cover and protrudes from the angle valve body, the upper cover is mounted on the angle valve body, a guide sleeve is fixed on the upper cover, a packing gasket, a first packing component, a packing spacer sleeve, a second packing component, a packing gland, a scraper seal and a packing press plate are arranged on the valve rod in sequence, and the upper cover, a sealing ring and the angle valve body are fixed by upper cover studs and upper cover nuts. With the adoption of the angle valve, the functions of small opening adjustment and opening and closing in the whole stroke can be achieved, the requirement of field process control can be completely met, the valve is good in dynamic stability and is convenient to maintain on line, the maintenance cost of a product is reduced, the possibility of medium leakage at the sealing position between the valve rod and packing is reduced, the valve is good in tightness, medium dead zones can be decreased, and material accumulation can be avoided.

The invention relates to a bellows parallel gate valve. Bellows wedge-shaped gate valves and bellows stop valves exist and are originally applied in present market, and have the defects of poor sealing property and short service life. The bellows parallel gate valve comprises a valve body and a valve cover, wherein a valve rod is arranged in the valve body; a bellows is arranged outside the valve rod in a sleeving mode; a valve element is arranged at the lower part of the valve rod. The bellows parallel gate valve is characterized in that a flow passage is arranged in the valve element; two flashboards parallel to each other are arranged on the flow passage; an elastic part is arranged between the two flashboards; the flashboards are fixed on a valve seat. A bellows structure is combined with a parallel gate valve, the performance requirement of zero leakage can be reached, the defects of the stop valves and the wedge-shaped gate valves are also avoided, and the bellows parallel gate valve is higher in sealing property and longer in service life.

The invention belongs to the technical field of construction machinery monitoring, and discloses an Internet of Things monitoring system installed on construction machinery, including a monitoring center, a mobile terminal, a monitoring terminal and a SAAS management platform; The service software formulated, and the monitoring center and the mobile terminal also include an identification module and an alarm module; the monitoring terminal is embedded and installed on each construction machine, and each monitoring terminal is provided with a unique and corresponding monitoring code. The present invention The combination of the positioning of the positioning module, the direct monitoring of long-range wireless transmission, and the indirect monitoring of short-range wireless transmission can effectively realize the accurate positioning of construction machinery; the direct monitoring also cooperates with the self-locking setting to avoid the occurrence of the corresponding machinery The phenomenon of over-range use, while indirect monitoring can effectively eliminate monitoring blind spots and reduce the probability of mechanical loss; in summary, the leasing risk is greatly reduced.

The invention provides an online-maintained backflow preventer. The online-maintained backflow preventer comprises a casing provided with a water inlet valve, a water outlet valve and a drain valve. The inside of the drain valve is divided into an inner cavity and an outer cavity through a diaphragm; the inner cavity is communicated with a cavity between a first valve plate and a second valve plate through a channel on the casing; the outer cavity is communicated with an internal cavity of the casing. The drain valve is fixed inside the casing, and a drain valve seat is mounted under the drain valve; one end of a drain valve stem component is movably mounted in the drain valve seat, and the other end of the drain valve stem component plugs a drain outlet through a drain valve plate; a drain resetting device is arranged on a drain valve stem which penetrates the diaphragm in the drain valve and is fixed with the same. The water inlet valve, the water outlet valve and the drain valve can be removed freely; the casing is provided with an access hole. The online-maintained backflow preventer has the advantages that water waste caused by draining due to unstable water pressure is avoided and online maintenance is achieved.

The invention discloses an antifreezing heat pipe air heater system which comprises a heat pipe air heater body, an air heater water chamber with a first water opening and a second water opening, a downstream heat exchange control circuit and a counterflow heat exchange control circuit. The lower portions of all heat pipes stretch into the air heater water chamber, and when the temperature of air is lower than or equal to set temperature, hot water supplied to the air heater water chamber from the outside flows to the second water opening from the first water opening to be consistent with the flowing direction of the air passing through the heat pipe air heater body; the counterflow heat exchange control circuit is connected with the second water opening and the first water opening, and when the temperature of the air is higher than the set temperature, the hot water supplied to the air heater water chamber from the outside flows to the first water opening from the second water opening to be opposite to the flowing direction of the air passing through the heat pipe air heater body. The antifreezing heat pipe air heater system has the advantages that when the antifreezing heat pipe air heater system is in downstream heat exchange with the air, the heat pipes are prevented from being frozen well, and freezing prevention in winter is thoroughly achieved; when the antifreezing heat pipe air heater system is in counterflow heat exchange with the air, the heat exchange effect is well enhanced.

The invention relates to an up-mounting type double-eccentricity ball valve which comprises a valve body, a ball body, a valve rod and an operating mechanism of the valve rod. A valve cavity and two medium channels arranged at two ends of the valve cavity are arranged inside the valve body, the ball body is arranged inside the valve cavity, two valve seats matched with the ball body are arranged at positions, corresponding to all medium channels, of the valve cavity, the valve body is provided with an opening enabling the ball body and the valve seats to penetrate through, a valve cover is arranged on the opening, the valve cover and the valve body are detachably connected, the valve seats are arranged to be soft valve seats, the ball body is in an eccentric structure, a diagonal line of a front end of the closing rotating direction of a section of the ball body is smaller than a diagonal line of a rear end of the closing rotating direction of the section of the ball body, wherein the section is perpendicular to a rotating shaft of the ball body, and the two valve seats are respectively arranged towards one side of the closing rotating direction of the ball body in an inclined mode. According to the technical scheme, the up-mounting type double-eccentricity ball valve has the advantages of largely improving service life of the ball valve and facilitating on-line repair.

The invention relates to a method for opening and closing a double-layer valve element assembly of a pipeline valve. The method is characterized in that an opening and closing method of a pipeline double-layer valve element cylinder valve and double-layer valve element check valve assembly structure and a pipeline double-layer valve element cylinder valve and double-layer valve element check valveassembly is adopted by the double-layer valve element assembly of the pipeline valve, and a double-layer valve element check valve has a double-layer valve element cylinder valve work state, an online production state and a online production stopping state. According to the method for opening and closing the double-layer valve element assembly of the pipeline valve, the problem that a cylinder valve and a check valve cannot achieve online maintenance and valve body and valve element replacement is solved; under the condition that medium flowing of a power pipeline is not stopped, a double-layer valve element cylinder valve and the double-layer valve element check valve are opened and closed, and online overhauling of the double-layer valve element cylinder valve and a valve element or a valve rod and a valve element of the double-layer valve element check valve is achieved. Especially, great convenience is brought to overhauling and replacing of singly used cylinder valves and check valves on poisonous and harmful power pipelines.

The invention discloses an easily-disassembled intelligent water meter convenient for online maintenance, and belongs to the field of water meters. The intelligent water meter convenient for online maintenance is convenient to observe the internal condition of a second circulation body by fixedly installing a viewfinder on the right upper side of the second circulation body, and control and maintenance are achieved on a mobile phone computer terminal; under the action of a controller, connection and disconnection of a magnetic attraction piece and an electromagnet are controlled, so that the electromagnet is controlled to slide in a placement groove and a longitudinal groove and slide upwards in the longitudinal groove, and under the action of an electric telescopic rod, disconnection of a first connecting sleeve and a second connecting sleeve is achieved, so that the second connecting sleeve is conveniently taken down and online maintenance is convenient. Through detachable mounting of a first connecting gear and a second connecting gear, maintenance and replacement of the first connecting gear and the second connecting gear are facilitated, and then dismounting and mounting of the first circulating body and the second circulating body are facilitated.

A double-eccentric ultralow temperature butterfly valve comprises a valve body, a valve rod and a butterfly plate. The double-eccentric ultralow temperature butterfly valve is characterized in that a manhole is formed in the valve body, and an upper maintenance cover is arranged at the position of the manhole; a sealing component composed of a sealing ring, a pressing ring and a jacking and pressing component is included; the inner side face of the sealing ring is sealed with the butterfly plate, the jacking and pressing component comprises a locking ring, a plurality of jacking and pressing screws arranged on the locking ring and locking nuts connected with the jacking and pressing screws, the end portions of the jacking and pressing screws are pressed on the outer end face of the pressing ring, a circular bead face is arranged at the end, away from the pressing ring, of the locking ring, and a compression ring compressed on the circular bead face is inserted in the inner cavity wall of the valve body. Through the structure, the sealing ring is convenient to replace online, and the online maintenance of the valve body is more convenient and faster. In the maintenance process, only the upper maintenance cover needs to be opened, and the sealing component is dismounted one by one. In addition, the position of the pressing ring is controlled by adjusting the jacking and pressing screws, the compression amount of the sealing ring can be adjusted, and therefore the sealing performance of the valve is guaranteed, and the safe reliability of the valve is improved.

The invention discloses a low-temperature up-mounting type fixed ball valve. The low-temperature up-mounting type fixed ball valve comprises a ball body, a valve seat and a valve body, wherein the valve seat is arranged between the ball body and the valve body; the valve seat comprises a fixator and a spring base, which are of split type structures; the fixator comprises a convex end and a concave end, wherein the convex end is in contact with the ball body; the spring base and the valve body are sequentially arranged on the concave end from left to right; a sealing slot is formed between the bottom of the valve body and the upper surface of the concave end; a spring energy-storage sealing ring is arranged in the sealing slot; the spring base is of an L-shaped structure; the bottom of the spring base is equipped with a spring base positioning lug boss; the spring base positioning lug boss extends into the sealing slot, and is used for reducing transverse moving space of the spring energy-storage sealing ring; and the ball valve further comprises a pre-tightening nut which is mounted above the convex end, and one end of the pre-tightening nut is connected with the spring base. The low-temperature up-mounting type fixed ball valve is simple in structure, is convenient to mount and dismount, improves the sealing effect of the valve seat and the valve body, and prolongs the service life of the valve seat.

Disclosed is a cryogenic butterfly valve with a composite heat dissipation disc valve cover. The cryogenic butterfly valve comprises a valve body. A butterfly plate assembly and an axial floating type valve seat assembly are arranged in the valve body and form a sealing structure. A valve rod penetrates through the butterfly plate assembly to be fixed to the butterfly plate assembly, penetrates through an upper shaft hole and a lower shaft hole of the valve body, then penetrates through the valve cover upwards, stretches outwards in cooperation with a graphite packing layer in a stuffing box on the upper portion of the valve cover, and stretches upwards until penetrating through a support and entering an actuator assembly above the support. The actuator assembly does 90-deree rotary motion to drive the butterfly assembly to move. Due to the adoption of the thinking of improving temperature conductivity lambda, increasing the convection heat dissipation area A of the valve cover and the surrounding environment and the convection heat dissipation temperature difference delta T of the valve cover and the surrounding environment, a composite heat dissipation disc structure composed of a single large-diameter heat dissipation disc and a neck multi-ring small-diameter heat dissipation disc outside the valve cover is designed, and an excellent heat dissipation effect is achieved.

The invention discloses an ETS protective unit and a triply-redundant steam turbine emergency protection system. The ETS protective unit and the triply-redundant steam turbine emergency protection system are highly reliable and easy to use. The ETS protective unit is used in the steam turbine emergency protection system and comprises a processor and an AND gate circuit, an FPGA is adopted by the processor, three protective logic modules are arranged in the processor, the ETS protective unit receives shutdown signals of a steam turbine, the three protective logic modules in the processor respectively conduct the protective logic operation on the signals, level signals of three branches of operation results are transmitted to the AND gate circuit for AND logic, and protective motion signals are output. The three protective logic modules are utilized by the ETS protective unit for respectively performing the operation, the logic level 1 is output respectively for expressing that an ETS shuts down, AND taking logics output by the three protective logic modules finally drive the shutdown DO of the ETS protective unit to be output, and therefore the false action probability of an ETS system is greatly reduced.