42results about How to "Small water loss" patented technology

The invention discloses a rainwater collection and water-saving irrigation system used for an upland sloping field. The system comprises a rainwater collection pond or weir, a high-position water storage reservoir, a plurality of low-position water storage reservoirs, a water pump and a water conveying pipe, wherein the rainwater collection pond or weir is arranged on the middle part or lower part of a valley; the high-position water storage reservoir is arranged on the upper part of a hill body with maximum height in each hill body close to the rainwater collection pond or weir; the plurality of low-position water storage reservoirs are arranged on each hill body at the periphery of the high-position water storage reservoir respectively and are lower than the high-position water storage reservoir; the water pump is arranged beside the rainwater collection pond or weir; a water inlet of the water pump is connected with the rainwater collection pond or weir, and a water outlet of the water pump is connected with the high-position water storage reservoir; and the water conveying pipe is laid between the high-position water storage reservoir and each low-position water storage reservoir. By using the rainwater collection and water-saving irrigation system, surface runoff water produced by rainwater is accumulated in the rainwater collection pond or weir, water in the rainwater collection pond or weir is lifted to the high-position water storage reservoir by the water pump, water of the high-position water storage reservoir is conveyed to each low-position water storage reservoir through the water conveying pipe respectively, and water accumulated in each low-position water storage reservoir is used for irrigation when the irrigation is needed.

The invention relates to a preparation method of high-chromium vanadium-titanium magnetite pellets. The preparation method comprises the steps that (1) drying high-chromium vanadium-titanium magnetite to enable the moisture content of the high-chromium vanadium-titanium magnetite to be less than or equal to 1.4%; (2) dry-mixing the dried magnetite with bentonite for 10-15 min and then spraying water to conduct wet-mixing for 10-15 min; (3) braising a wet-mixed raw material under the constant-temperature conditions of 25-30 DEG C for 30-35 min; (4) putting the braised raw material into a pelletizer to prepare green pellets with the diameter being 10-12.5 mm; (5) drying the green pellets; (6) sintering the dried green pellets, heating the green pellets to 800-900 DEG C at the heating rate of 10-12 DEG C / min, heating the green pellets to 1150-1200 DEG C at the heating rate of 4-6 DEG C / min and then roasting the green pellets for 15-20 min; and (7) cooling the green pellets to 300 DEG C at the cooling rate of 5-8 DEG C / min and then taking out the pellets for air cooling. By means of the preparation method, the water evaporation rate is small during material braising; the pelletizing efficiency is high; the pellet drying time is short; the compressive strength of dried pellets is high; the roasting temperature is low, and the time is short; the low-temperature reduction degradation rate of the manufactured pellets is high; the reduction expansion rate is small; the reducibility is high; the softening-melting temperature is high; and the softening-melting interval is narrow.

The utility model discloses a high-speed disk type separator and relates to a centrifugal mineral processing device. The high-speed disk type separator comprises a motor, a rotary drum housing, a transmission device, and a rotary drum assembly, wherein the rotary drum assembly is arranged in the rotary drum housing and comprises a spindle, a working disk assembly and a rotary drum, the spindle vertically passes through the vertical center position of the rotary drum, the spindle is hermetically and fixedly connected with the lower end of the rotary drum, the upper end of the rotary drum is an opening, and the working disk assembly is mounted in the rotary drum. After mineral pulp is processed and deslimed, the content of particles with the diameter of less than 15 Mum in the separated materials is 10-25%, and the content of particles with the diameter of larger than 15 Mum in the overflowed / discharged mineral mud is less than 10%, the desliming efficiency is high, the metal particles with relatively large specific gravity are mainly concentrated in setting sand, the content of overflow metal is obviously lower than the content of metal in fed mineral, and the metal loss is small.

The invention discloses a novel backflow preventer. The preventer comprises at least two check valves which are communicated with each other and in series connection. A water escape valve is connected to and communicated with a valve body of the water exit section of the first check valve; the first check valve comprises the valve body; a valve seat is arranged on the inner wall of the valve body; a valve clack is arranged in the valve body and sealed with the valve seat; an elastic device is arranged on the valve clack; a movement constraint guide rail of the elastic device is arranged on the inner wall of the valve body; and the other end of the elastic device comes into contact with the movement constraint guide rail. The backflow preventer with the above structure can accurately sense the operating state of a system pipeline, and provide feedback when a backflow trend happens to a medium or a pipe explosion accident occurs before a valve, so as to preventing the medium from the backflow. By adopting the structure, the reached performance index exceeds the provision of the national standard CJ / T160-2002. The preventer can effectively prevent drinking water and other clean water from being polluted, and is suitable for occasions with strict requirements for water quality of drinking water systems and pipe systems.

The invention relates to the technical field of sewage treatment, in particular to a treatment method for synthesis and fermentation type pharmacy industrial sewage. The method can be used for domestic sewage pretreatment, production sewage pretreatment and comprehensive sewage treatment; after the production sewage and the domestic sewage are singly pretreated, sufficient mixing is performed; thecontinuous stability of biochemical system influent is further guaranteed; by aiming at the water quality and water quantity characteristics of the synthesis and fermentation type pharmacy waste water, the toxicity of the waste water is reduced through a Fenton advanced oxidization technology; biodegradability is improved; in addition, through the flocculent precipitation effect, flocs are eliminated; through the synchronous nitrogen and phosphorus removal process of A2 / O, the effluent quality of the sewage treatment is stable; the total hydraulic retention time is shortened; the active sandfiltering pool in the deep treatment section is an efficient filtering system integrating coagulation, clarification and filtering into a whole; the energy consumption is reduced, and the resources are saved.

The invention relates to a control method for indoor fire alarm, in particular to a control method capable of detecting indoor environmental humiture, reducing temperature and increasing humidity. The method comprises the following steps: utilizing a sensor to sense the humiture change of the indoor environment; starting a sprayer (non-fixed point type) to spray fine water mist when the indoor temperature is increased and the humidity is decreased; reducing the temperature and increasing the humidity by attaching the water mist to the indoor articles, and using the sensor to continuously sense if the indoor temperature is reduced and the humidity is increased or not; if the indoor temperature is reduced and the humidity is increased, turning off the sprayer; if the indoor temperature is increased and the humidity is decreased, restarting the sprayer for spraying the water mist and starting an automatic temperature-sensing water sprayer at proper time for spraying the water mist to a specific position and area (fixed point type); and then turning off the automatic temperature-sensing water sprayer till the sensor detects that the indoor temperature is reduced and the humidity is increased, thereby relieving the indoor fire alarm, achieving the purposes of controlling the indoor fire alarm, spraying water mist in sections and reducing the loss of the indoor articles caused by water, and reducing the degree of casualty loss.

The invention relates to a long channel firefighting system, which is applied in the long channel provided with an air inlet and an air outlet . The invention comprises a first water spray curtain device, a second water spray curtain device, and at least a third water spray curtain device, wherein the first water spray curtain device is arranged at top part of the wind inlet, the second water spray curtain device is arranged at top part of the air outlet , the third water spray curtain device is arranged at top part of the long channel between the air inlet and the air outlet so as to divide the long channel into a plurality of firefighting areas. The purpose of the invention is to prolong escape time when disaster happens, and reduce the influence of thick smoke on persons.

The invention provides lithium base grease, which is prepared from the following raw material ingredients in parts by mass: 80 to 83 parts of basic oil, 20 to 25 parts of middle oil, 2.2 to 2.5 parts of lithium hydroxide, 8 to 11 parts of acid for saponification, 1.5 to 1.8 parts of antioxidants, 0.5 to 0.9 parts of accessory ingredients, 1.5 to 1.9 parts of antirusting agents and 9 to 12 parts of water. The invention also provides a preparation method of the lithium base grease. The lithium base grease prepared by the method has the advantages that the NLGI thickness is No.2; the lithium base grease has no corrosivity on metal; the anticorrosive performance is the first grade; the similar viscosity (-10 DEG C, 10s<-1>) is 810 to 825pa.s; the work penetration is 270 to 275; the oxidization stability is high; the pressure drop is 3 to 5kpa under the condition of 99 DEG C, 100h; the extension work penetration change rate is small; the dripping point is as high as 180 to 206 DEG C.

The invention relates to a water-saving siphon type one-piece pedestal pan comprising an integrated flush toilet body and a water tank, wherein auxiliary water channels and a siphon bend are arranged on the flush toilet body. The water-saving siphon type one-piece pedestal pan is characterized in that a laterally inversed V-shaped folding part extending out of the upper part inside a pipe cavity is arranged in the middle of an outer side pipe wall of a small S bend of the siphon bend; a left auxiliary water channel and a right auxiliary water channel are symmetrically arranged at two sides ofthe back part of the flush toilet body, the upper ends of the left auxiliary water channel and the right auxiliary water channel are communicated with the water tank; and the lower ends of the left auxiliary water channel and the right auxiliary water channel are respectively communicated with a sewage draining opening of the flush toilet body through a connecting water channel arranged around the sewage draining opening of the flush toilet body. A double-flushing type injection pipe with a large flushing force and a favorable direct wash-down effect is formed by the left auxiliary water channel and the right auxiliary water channel; a hopper section is formed between the folding part of the siphon bend and a necking down part; the pipe diameter of the siphon bend above the folding part can be increased to 45-50mm; the hopper section is arranged to match with a big S bend of a big pipe diameter, which ensures that early water passing through the folding part seals air and then enters the hopper section to form double water-sealing and ensures that big siphon is formed as soon as possible; only 41-42 L of water is needed, therefore, the water-saving effect is obvious; and the dilution rate reaches 100%, therefore, the flushing is thorough.

The invention discloses an open-air dust-removal system, which comprises a high rod atomizing device, a charging demisting dust-removal device, a dust concentration sensor, an air humidity sensor, an anemometer, a controller and an automatic retractable dust collecting plate, wherein signals acquired by the dust concentration sensor, the air humidity sensor and the anemometer are transmitted to the controller; the controller calculates the atmospheric dust concentration, the air humidity and the outside wind speed at the moment according to the received data; the controller controls the high rod atomizing device and the charging demisting dust-removal device according to the calculated atmospheric dust concentration, air humidity and outside wind speed, and controls the automatic retractable dust collecting plate to be unfolded or folded. The open-air dust-removal system can fulfill the purpose of dust removal in a safe, energy-saving, high-efficiency and self-adapting to external environment manner.

The invention discloses a check valve. The check valve comprises a first cavity and a second cavity, wherein the first cavity is used for liquid flow, and the second cavity is located at one end of the first cavity. A liquid inlet, a liquid outlet and a butterfly plate which is located between the liquid inlet and the liquid outlet are arranged on the first cavity. An elastic member is arranged inthe second cavity. A pivot is arranged on the butterfly plate. The butterfly plate is pivoted into the first cavity through the pivot. The check valve is further provided with a connecting rod. One end of the connecting rod is movably connected to the lower portion of the pivot on the butterfly plate, and the other end of the connecting rod is arranged in the second cavity in a sliding mode and abuts against the elastic member. The connecting rod comprises an isolation member for slidably sealing the second cavity and the first cavity, and the isolation member can move in the second cavity. The water pressure action area of the isolation member is smaller than the water pressure action area of the butterfly plate facing the liquid outlet. Therefore, the zero flow velocity can be traced automatically, and the zero flow velocity of the check valve can be closed.

The invention discloses a pipe bursting and flow limiting valve. The pipe bursting and flow limiting valve comprises a valve body, a flow guide body, a flow limiting body, supporting and moving structures, a sliding block, a sliding rod, a damping device and a tension trigger structure, wherein two ends of the valve body are provided with medium circulating pipes, the flow guide body, the flow limiting body, the supporting and moving structures, the sliding block and the sliding rod are arranged in the valve body, the flow guide body is arranged in a cavity formed by a valve body shell along a medium flowing direction, the flow limiting body and the flow guide body are oppositely arranged, a flow limiting passage is formed between a flow limiting surface of the flow limiting body and the inner wall of the valve body shell, the flow guide body and the flow limiting body are supported between the supporting and moving structures, the sliding block is connected with the flow guide body and the flow limiting body, the sliding rod is connected with the sliding block, the damping device which is used for moving the sliding block is connected with one end of the sliding rod, the tension trigger structure is connected with the other end of the sliding rod, and the damping device and the tension trigger structure are arranged outside the valve body. The pipe bursting and flow limiting valve disclosed by the invention is reasonable and simple in structural arrangement, flexible in motion and is particularly suitable for pipe bursting and flow limiting of a large-scale water pipeline in a no-power area.

The invention discloses an integrated A2O improvement system, and belongs to the technical field of water treatment. The system comprises an inlet water mixing area, an anaerobic zone, an anoxic zone, an aerobic zone, a secondary sedimentation tank water inlet area, a secondary sedimentation tank, a sludge return area, an effluent area and a residue supernatant discharge area. According to the traditional A2O process, and with the combination of sewage flow state in an oxidation ditch process, the secondary sedimentation tank and an improved A2O pool are built together by combining a sewage flow state of an oxidation ditch process. According to the process, the joint area formed by joint building is fully utilized, so that multiple structure functions are integrated, the floor area is greatly reduced, the pipeline loss is reduced, the investment is reduced, the operating cost is reduced, the advantages of the A2O and oxidation ditch process are combined, the change requirements of the water quality and water quantity are met, the technological adaptability is high, and the system is attractive and practical.

The invention discloses a power-assisted electronic pressure regulating valve, comprising a valve body, a valve seat, a valve core and a valve cover; wherein the bottom part of the valve core is provided with a valve plug; the upper part of the valve core is provided with an annular cockle rubber cup; the side surface of the valve seat is provided with a draft tube which is connected with the water inlet of the valve and communicated with the inside of a seal cavity formed by the valve cover, the rubber cup and the valve core; an outflow tube is accessed to the outside of the valve body by the seal cavity; meanwhile, an electric or electromagnetic starting-closing device is arranged to control the on-off of the draft tube and the outflow tube, thereby controlling the on-off of the valve, solving the problems of automatically opening and closing the valve, and realizing automatic control with micro-power consumption; the zero-power consumption self-locking function of the valve at any opening angle reduces the water loss during an over-current, and solves the problems of automatically opening and closing the valve; moreover, the flux size can be controlled, and the valve can be prevented from being freely opened and closed. The power-assisted electronic pressure regulating valve has reasonable structure, is scientifically designed, is convenient for use, not only can be used on a water tube, but also can be suitable for other liquid or gases.

The invention relates to the technical field of lubricating grease, and provides heat-resistant grease for a gap type overhead conductor, the heat-resistant grease is prepared from the following raw materials in parts by mass: 155-180 parts of base oil, 52 to 60 parts of a thickening agent, 1.5 to 2.5 parts of an antirust agent, 3-4.5 parts of an oil separation inhibitor, 1.5 to 2.5 parts of an antioxidant, 3-5 parts of an adhesive and 6-8 parts of a solid filler, wherein the thickening agent is a polyurea-based composite thickening agent and is prepared from diphenylmethane-4, 4 '-diisocyanate, p-toluidine and cyclohexylamine, the oil separation inhibitor comprises modified nano silicon dioxide, and the adhesive comprises atactic polypropylene. The heat-resistant grease for the gap type overhead conductor, provided by the invention, has excellent wide-temperature applicability and good salt mist resistance, water spraying resistance and aging resistance.

The invention provides a carbon-sand double filter tank with central canals. Three layers of central canals, namely an upper-layer produced water drainage channel, a middle-layer sand tank drainage channel and a lower-layer carbon tank water inlet channel, are arranged in the center of a carbon tank, and the lower-layer carbon tank water inlet channel is also used as a back-washing gas distribution channel; two layers of central channels, namely an upper-layer drainage channel and a lower-layer back-washing water and gas distribution channel, are arranged in the center of a sand tank; and thecarbon tank and the sand tank are separated by a partition wall and are communicated only through upper-layer water passing holes of the central channels. After entering, the water to be treated is treated by an upward flow activated carbon adsorption tank, then enters the sand tank from the water passing holes in the partition wall, is filtered in the sand tank and then is discharged. The carbon-sand double filter tank with central canals provided by the invention is reasonable and feasible in tank type combination, compact in arrangement, simple in structure, low in manufacturing cost, few in pipelines and small in occupied area.

The invention relates to the technical field of lubricating grease, and provides wear-resistant and high-temperature-resistant lubricating grease which is prepared from the following raw materials inparts by mass: 90-110 parts of base oil, 31-36.5 parts of a thickening agent; 15-18 parts of water; 5-10 parts of a solid lubricant; 2.2-3 parts of an extreme pressure anti-wear agent; 0.5-1 part of afriction modifier; 1.5-2 parts of a clearing agent; 2-3.5 parts of an adhesive; 0.5-1.5 parts of an antioxidant; 1-3 parts of an antirust agent; 0.5-1.5 parts of a metal deactivator, wherein the extreme pressure anti-wear agent comprises tricresyl phosphate, borate and a modified nano graphene dispersion liquid. The wear-resistant high-temperature-resistant lubricating grease has good wear resistance and high temperature resistance.

The invention discloses an annular pipe network irrigation system. The annular pipe network irrigation system comprises a first part, a main pipe, sub-main pipes, water supply plugs, branch pipes, andcapillary pipes, wherein the first part comprises a pressurization system and a filtration system, the first part communicates with a water source, the main pipe communicates with the first part, thesub-main pipes communicate with the main pipe, the water supply plugs are arranged on the sub-main pipes, the branch pipes communicate with the sub-main pipes through the water supply plugs, the capillary pipes communicate with the branch pipes, the sub-main pipes are at least two, one end of each sub-main pipe communicates with the main pipe, the other ends of the sub-main pipes communicate witheach other, and an annular pipe network is formed between the main pipe and the sub-main pipes. The system has the advantages of small water loss, stable water supply, convenient maintenance and highpipeline utilization rate, and is mainly used for conveying water in farmland irrigation systems.

The invention relates to a low-water-loss rainwater filter tank. The low-water-loss rainwater filter tank comprises a well body, a cover plate arranged above the well body, a water inlet pipe and a water outlet pipe which are arranged at the front end and the rear end of the well body, a retaining wall longitudinally arranged inside the well body and a supporting plate arranged between the retaining wall and the rear end of the well body, wherein the retaining wall and the supporting plate divide the interior of the well body into a presedimentation zone at the left side, the upper part of theright side is a filtering zone and the lower part of the right side is a sedimentation zone; the presedimentation zone is communicated with the water inlet pipe; the filtering zone is communicated with the water outlet pipe; the retaining wall is provided with a water flowing channel from the bottom surface of the well body, and the upper end of the retaining wall is provided with an overflow channel from the cover plate; a filtering medium is paved above the supporting plate; and a water flowing hole is formed in the supporting plate. The low-water-loss rainwater filter tank provided by theinvention has a good rainwater treatment effect, and pollution of pollutants on natural water body can be effectively reduced. External power drive is not required in a treatment process, and normal flood discharge is not influenced. Besides, water loss in the treatment process is low.

The invention relates to a float-type automatic control flap valve and belongs to the technical field of water supply and drainage equipment. The float-type automatic control flap valve comprises a valve body with a flow pass, a cylindrical pipe is fixed to the outer wall of the valve body, the center section in the longitudinal direction of the pipe is of a trapezoidal structure with the short top end and the long bottom end, an inclined flow pass port is formed in the outer end face of the pipe, the outer side of the valve body is hinged to one end of a support rod, the other end of the support rod is fixedly connected with a float, the end, hinged to the valve body, of the support rod is fixedly connected with one end of a connection rod, the other end of the connection rod is hinged to one end of a balance weight lever frame, the end, hinged to the connection rod, of the balance weight lever frame is fixedly provided with a balance weight, the middle section of the balance weight lever frame is hinged to the outer wall of the top of the pipe, and the other end of the balance weight lever frame is hinged to the outer side of a valve plate. When the valve plate is closed, the inner side of the valve plate makes contact with the outer end face of the pipe in a sealed mode. The float-type automatic control flap valve is provided with the stainless steel float and the balance weight lever frame, and the valve plate is controlled to be opened or closed according to the water level.

A fire extinguishing method by use of gas-liquid mixture features that the N2-enriched air is mixed with the solution whose primary component is water to obtain the mixture whose specific weight is higher than that of air, and the mixture is used to cover on fire flame for extinguishing it. Its apparatus is composed of gas-liquid mixing and straightening unit, ultrasonic water particle generator, N2-enriched air generator, air compressor, water storage container and pipeline.

The invention discloses a step-by-step sewage conveying system. The step-by-step sewage conveying system comprises a negative pressure collector, wherein the negative pressure collector is connected with a user side drainage pipe, can collect sewage of a user side, and is connected with a negative pressure power center through a step-by-step conveying assembly; the negative pressure power center can enable the inside of the step-by-step conveying assembly to be in a negative pressure state; the step-by-step conveying assembly in the negative pressure state can discharge the sewage in the negative pressure collector; the step-by-step conveying assembly comprises a plurality of sections of negative pressure collecting pipes; each section of negative pressure collecting pipe is inclined; the inclination direction of each section of negative pressure collecting pipe is the same as the flowing direction of the sewage in the corresponding negative pressure collecting pipe; and each two sections of negative pressure collecting pipes are connected through a lifting bend. By the step-by-step conveying assembly, the sewage can be conveyed along the inclined negative pressure collecting pipes, and is lifted by the lifting bends after reaching a certain depth, the sewage conveying efficiency is improved, meanwhile, water loss between the sewage and the pipes is also reduced, and efficient running of the whole negative pressure conveying system is ensured.

The invention relates to a carbon-sand double-spliced filter tank which comprises at least one group of carbon tank and sand tank which are arranged in parallel, the carbon tank and the sand tank areisolated through a partition wall, partition wall openings are formed in the partition wall, a plurality of water collecting tanks penetrating through the carbon tank are arranged in the carbon tank,and water outlets of the water collecting tanks correspond to the partition wall openings in position. Drainage devices corresponding to the positions of the partition wall openings are arranged in the sand pool, the drainage devices are lower than the water collecting tanks, and the water collecting tanks are connected with the drainage devices through water guide pipes. In the implementation process, the integrated double-spliced filter tank is not provided with a central channel, the effective filter area of the tank type is large, the arrangement is reasonable and compact, and the occupiedarea is small. Meanwhile, an upward flow activated carbon adsorption tank and the sand filter tank are combined in one tank, the structure is simple, pipelines are few, and water loss is small.

The invention provides long-service-life high-temperature lubricating grease which is prepared from the following raw materials in parts by mass: 80-82 parts of base oil, 2.6-2.9 parts of lithium hydroxide, 10-13 parts of saponification acid, 2.1-2.3 parts of an antioxidant, 2.0-2.5 parts of an extreme pressure anti-wear reagent, 0.5-0.8 part of an anti-rusting agent, 0.1-0.5 part of polyimide and 8-10 parts of water. The invention further provides a preparation method of the lubricating grease. The long-service-life high-temperature lubricating grease provided by the invention is used on bearings, the lubrication service life at 149 DEG C at the rotation speed of 1000r / minute is 1600-1700 hours, the working penetration degree is 285-290, the working penetration degree is 0.1mm after 105-time reciprocation movement, the change rate is 3-5%, the dropping point is up to 303-308 DEG C, and the lubricating grease is good in pressure and abrasion resistance, good in oxidation resistance, slight in steel net oil separation, small in bearing loss, small in washout loss and small in evaporation amount.

The invention relates to the technical field of sewage treatment devices, and provides a multistage synergistic self-circulation anaerobic ammonia oxidation reaction device. The device comprises: a main body, a water body accelerator, an ascending guide pipe, and an aeration device, wherein the main body is provided with an inlet and an outlet, and is internally provided with a main reaction zone; a gas-liquid separation zone is arranged above the main reaction zone; the water body accelerator is connected with the inlet, and at least one part of the inner diameter of the water body accelerator decreases in the flowing direction of the water body; the ascending guide pipe is arranged in the main body, a main reaction zone is formed between the ascending guide pipe and the main body, the water inlet end of the ascending guide pipe corresponds to the water outlet end of the water body accelerator, and a first notch is formed in the end, corresponding to the water body accelerator, of the ascending guide pipe; the aeration device is arranged in the main reaction zone; the water inlet end of the gas-liquid separation zone is communicated with the main reaction zone, and the water outlet end of the gas-liquid separation zone is communicated with the outlet. The multistage synergistic self-circulation anaerobic ammonia oxidation reaction device has the advantages that water distribution is more uniform, growth of anaerobic ammonia oxygen bacteria is facilitated, and the water purification efficiency is improved.

The invention relates to a slowly-open slowly-close fully-open and vibration-free swing check valve, and belongs to the technical field of valves. The swing check valve comprises a valve body, a valve deck arranged on the valve body, a valve shaft arranged at the upper end, close to a water inlet, inside the valve body, and a valve clack fixedly connected to the valve shaft. The valve shaft penetrates through the valve body and stretches out of the valve body, a locking arm is fixed to the inner side of the valve clack, and the part, stretching out of the valve body, of the valve shaft is connected with a first driving device; the valve body is provided with a rotating shaft, the part, located in the valve body, of the rotating shaft is fixedly connected with a locking hook used for hooking the locking arm, and the part, stretching out of the valve body, of the rotating shaft is connected with a second driving device. The swing check valve plays a role in sealing and checking, and also has a locking function. The swing check valve has valve closing and opening functions, when a system operates normally, a valve closure member, namely the valve clack, can be fully opened, water damage of the system is reduced, energy resources are saved, and shaking of the valve clack is small after the valve is opened.