62 results about "Backwater valve" patented technology

A backwater valve cover configured to prevent a backwater valve opening from releasing toxic soil gases into a home includes a base and a lid. The base is configured to be installed above a backwater valve. The base includes a central access opening, a first plurality of fastener holes configured to accept a first plurality of fasteners, and a second plurality of fastener holes configured to accept a second plurality of fasteners. The lid is configured to cover the central access opening and be fastened to the base via the second plurality of fasteners.

The invention provides an efficient copper electrolysis anode slime dehydration method, belongs to the technical field of filter pressing, and solves the problem that whether a diaphragm of an anode slime filter press leaks or not cannot be detected in the existing anode slime dehydration use process. Adjusting the water pressure to a target pressure value through an overflow valve; a pressure sensor on the anode mud dehydration device is used for monitoring and feeding back the pressure in a diaphragm in real time, and punching is adjusted or stopped according to data fed back by the pressure sensor arranged between the water storage tank and the multi-stage centrifugal pump; accumulated water in the diaphragm is discharged to the water storage tank through the water return valve for collection and utilization, and the radar liquid level meter monitors the liquid level of the water storage tank. According to the method, the diaphragm pressure of the anode mud dehydration device is set and monitored, the diaphragm state is detected in real time, the dehydration effect is ensured, the water supplementing function is achieved, the dehydration efficiency is improved, the monitoring capacity is enhanced, automatic operation is achieved, and equipment and facilities are protected against corrosion.

The utility model relates to a water pressure adjustable mobile water spraying test water supply device, which comprises a water bucket and a water pump arranged on the outer side of the water bucket, a connecting pipe extends out of the lower part of the water bucket and is communicated with the water pump, the water pump supplies water to a water spraying pipe through a water supply pipe, and the upper part of one side of the water supply pipe close to the water pump is provided with a bypass and a water return pipe; the water return pipe is used for returning part of water from the water pump back to the bucket to reduce the water pressure supplied to the water spray pipe by the water supply pipe; a water return valve is arranged on the water return pipe, and the water return flow of the water return pipe is adjusted by adjusting the water return valve, so that the water spraying pressure of the water spraying pipe in the water spraying test is adjusted; according to the movable water spraying test water supply device with the adjustable water pressure, a high-grade water pump does not need to be replaced, the water return pipe with the water return valve is arranged on the basis of existing equipment, the spraying pressure can be adjusted with low cost, and the movable water spraying test water supply device has good application prospects.

The utility model relates to the technical field of primary coolers, in particular to a descaling device for a primary cooler, which is characterized in that a backwashing water return valve is connected to a cooling water feeding pipe in parallel, a gas-water pulse flow feeding valve is connected to a cooling water return pipe in parallel, a gas-water mixing device, an ultrasonic flowmeter and a gas flowmeter are arranged at the tail end of the gas-water pulse flow feeding valve, and the gas-water mixing device is connected with the ultrasonic flowmeter and the gas flowmeter. The other end of the ultrasonic flowmeter is connected with a ball valve through a pipeline, the other side of the gas flowmeter is connected with a pressure stabilizing device through a pipeline, and the other end of the pressure stabilizing device is connected with an air compressor through a pipeline. The gas-water mixing device comprises a main pipe section, a backwashing water inlet interface, a backwashing gas inlet interface, a pressure sensor interface and a guide plate; the gas-water pulse flow water feeding valve and the backwashing water return valve are connected to the cooling water feeding pipe and the cooling water return pipe in parallel, so that the primary cooler pipeline is easier and more efficient to clean, the service life of the primary cooler is prolonged, and the effects of reducing cost and improving efficiency are achieved.

The invention belongs to the technical field of steelmaking and continuous casting, and particularly relates to a system and method for remotely controlling accident water through a continuous casting machine by applying PID. The system comprises a first connecting pipe, a machine cooling pump, an accident water tank, an accident water inlet pipe, an accident water return pipe, a second connecting pipe and a PID control unit. A water return port of the continuous casting machine is connected with one end of the machine cooling pump through a first connecting pipe, and the other end of the machine cooling pump is connected with a water inlet of the continuous casting machine through a second connecting pipe. The accident water tank is connected with the second connecting pipe through an accident water inlet pipe; the PID control unit comprises an accident water return valve control unit and a PIC control unit; the accident water return valve control unit is arranged on the accident water return pipe; the PIC control unit is connected with the first connecting pipe; and the accident water return valve control unit is connected with the PIC control unit. Based on the system and the method, the problems that a traditional accident water control method is large in error, insufficient in reliability, weak in anti-interference capacity and high in maintenance cost can be solved.

The utility model discloses an air source heat pump water heater capable of automatically returning water, which comprises an air source heat pump water heater, and the air source heat pump water heater comprises a water storage tank. One end of the hot water supply pipe is connected with the water storage tank, and the other end is connected with the user-side water supply device; the temperature control water return valve is mounted at the tail end of the hot water supply pipe; one end of the water return pipe is connected with the temperature control water return valve and the other end is connected with the water return interface of the water storage tank; and the one-way backflow device is arranged on the water return pipe. Through reasonable configuration of the temperature control water return valve and the water return pipe, when the water temperature in the hot water supply pipe is lower than a set value, the temperature control water return valve is automatically opened, cold water in the pipe flows back to the water storage tank through the water return pipe, automatic backflow of the cold water is achieved, and the problems that a traditional air source heat pump water heater is long in hot water waiting time and cold water is wasted are effectively solved; the utilization rate of water resources is improved, and the user experience is improved.

The application relates to the technical field of spraying equipment control and discloses a control method of spraying equipment, which comprises the following steps: initializing a plurality of modules based on a control module; unfolding a plurality of spraying rods; driving a winch module to lower a hoisted spraying rod module; sequentially opening spraying valves and spraying pumps in the valve pump module to supply materials to the spraying rod module through spraying pipelines; acquiring a first pressure value; when the first pressure value is greater than a starting pressure value, controlling a motion module to drive the spraying equipment to move along a first route; when the spraying equipment moves to the end point of the first route, sequentially closing the spraying pump and the spraying valve; opening a spraying backwater valve, then opening a cleaning pipeline pump, releasing cleaning liquid into the spraying pipeline for cleaning and continuing for a first cleaning time, and closing the cleaning pipeline pump and the spraying backwater valve; moving to the starting point of the first route; driving the winch module to lift the spraying rod module, and recovering the spraying pipeline; and resetting the spraying rod.

The present invention discloses a local cleaning system and method for the secondary circuit side of a nuclear power direct current steam generator. A demineralized water inlet and a chemical dosing port are provided on the cleaning tank. A cleaning tank liquid level gauge is arranged inside the cleaning tank. A main feed water temporary blind plate is provided on the main feed water connection section of the steam generator; a main steam temporary blind plate is provided on the main steam connection section of the steam generator. The outlet of the cleaning tank is connected to the water inlet on the main feed water temporary blind plate through a cleaning pump. The water outlet on the main feed water temporary blind plate is divided into two paths. One path is connected to the inlet of the waste liquid tank through an exhaust valve, and the other path is connected to the inlet of the cleaning tank through a return water valve. The liquid level measurement port on the main feed water temporary blind plate is connected to one end of a temporary liquid level gauge, and the other end of the temporary liquid level gauge is connected to the liquid level measurement port on the main steam temporary blind plate. This system and method have the characteristics of short cleaning cycle, low consumption of chemicals and demineralized water, small equipment volume, and low cost.

The present invention discloses a connecting valve, a return water valve, a pressure valve assembly and a water supply system. The return water valve includes a valve body and a linkage valve. The valve body is provided with a hot water flow channel, a cold water flow channel and a one-way flow channel; the hot water flow channel includes a water inlet cavity, a communication cavity and a water outlet cavity, the communication cavity has a water inlet communicating with the water inlet cavity, and a water outlet communicating with the water outlet cavity; the one-way flow channel connects the communication cavity with the cold water flow channel. The linkage valve is arranged in the hot water flow channel and is adapted to switch between an initial position and an open position; wherein: in the initial position, one end of the linkage valve blocks the water outlet, and a gap is formed between the other end of the linkage valve and the water inlet; in the open position, the linkage valve opens both the water inlet and the water outlet. The return water valve of the present invention can solve the problem that the water in the hot water flow channel flows into the cold water flow channel when the water supply system uses the cold water mode.

The utility model discloses a pipeline water seepage detection device which comprises a moving trolley, a water tank, a water pump, a water pipe and a water pressure gauge are installed on the moving trolley, the water pipe is connected with the water tank, the water pump is installed on the water pipe, a pipeline connector is arranged on the water pipe, and the water pressure gauge is connected with the water pipe through a first three-way pipe. A water return pipe is connected to the water tank and connected with the water pipe through a second three-way pipe, a water return valve is installed on the water return pipe, and the control valve is located between the second three-way pipe and the water pump. The pipeline water seepage detection device has the advantages of being convenient to move, easy to operate and high in adaptability. And test water can be partially recycled, so that water waste is reduced.

The utility model discloses a die-casting die rapid cooling device which comprises a water supply station assembly, a die, a water return tank, a water supply valve assembly, a water return valve assembly and a high-speed cooling station assembly. The water supply station assembly comprises a cooling water tank, a cavity cooling pipeline and a pouring gate, a water inlet of the sprue spreader cooling pipeline is connected with a cooling water source through a water supply valve assembly, a water outlet is connected with a water return tank through a water return valve assembly, and a water outlet of the cooling water tank is connected with the pouring gate and a water inlet of the sprue spreader cooling pipeline; the high-speed cooling station assembly comprises a plurality of vacuum tanks, air inlets of the vacuum tanks are provided with exhaust pipes and water inlet pipes respectively, the other ends of the water inlet pipes are connected with water outlets of the pouring gate and the sprue spreader cooling pipeline through water return valve assemblies, and water drainage pipes are arranged on water drainage ports of the vacuum tanks. According to the utility model, the die can be efficiently cooled in an energy-saving manner, the cooling process is controllable, safe, reliable and quick in response, and the production efficiency is greatly improved.

The invention discloses a working medium multistage recovery system and method for frequent start and stop of a thermal power generating unit, and belongs to the technical field of energy conservation and emission reduction of thermal power plants. The system comprises a heat storage container; an inlet of the heat storage container is connected with a steam turbine drainage device, a boiler drainage device and an environment-friendly drainage device. An outlet of the heat storage container is connected to an inlet of the heat exchange unit through a recovery pipeline; the inlet of the heat exchange unit is further connected with a water outlet of the operation unit through a condensed water incoming adjusting valve. An outlet of the heat exchange unit is respectively connected with water inlets of the waste heat recovery container and the operation unit; and a condensed water return adjusting valve is arranged on a pipeline between the outlet of the heat exchange unit and the water inlet of the operation unit. According to the invention, gradient utilization of energy is realized, the temperature of condensed water entering an operating unit is increased, the fuel consumption required by boiler heating is reduced, the energy cost is reduced, and the energy utilization efficiency of the whole thermodynamic system is also improved.

The application discloses an engine, which comprises a cylinder head water jacket, a cylinder body water jacket, an oil-water exchanger and a thermostat, all of which are used for circulating cooling liquid; the oil-water exchanger and the thermostat are both communicated with a cylinder head water outlet of the cylinder head water jacket and with the cylinder body water jacket; a backwater part is provided with a backwater channel and a backwater valve for the flow of the cooling liquid; the backwater part is respectively communicated with the cylinder head water outlet and the cylinder body water jacket; when a main valve of the thermostat is closed, the backwater valve is opened to make the backwater channel in a conducting state; when the main valve of the thermostat is opened, the backwater valve is closed to make the backwater channel in a cut-off state. The engine provided by the application is provided with the backwater part between the cylinder head water jacket and the cylinder body water jacket; when the main valve of the thermostat is in a closed state, part of the cooling liquid can flow into the cylinder body water jacket through the backwater part, the flow into the oil-water exchanger is reduced, the influence on the oil-water exchanger is improved, and the service life of the oil-water exchanger is prolonged. The application further discloses a motorcycle.

This application relates to an adaptive temperature control method for a water heater and a water heater in general. The method includes: acquiring a preset outlet water temperature of the water heater and setting the current outlet water temperature to be equal to the preset outlet water temperature; activating a test preheating function, acquiring and recording the circulating water flow rate and the arrival time of the hot water at the return valve, and then deactivating the test preheating function; when activating the normal preheating function, compensating the outlet water temperature with a temperature compensation value determined based on the circulating water flow rate and arrival time. This method can determine a suitable temperature compensation value for each water point, regardless of the varying pipe lengths, avoiding gas waste caused by excessively high temperature compensation values ​​and gas waste caused by excessively low temperature compensation values ​​leading to excessively long preheating times.

The invention provides an underground rock stratum water outlet section fine exploration physical simulation experiment device and method.The underground rock stratum water outlet section fine exploration physical simulation experiment device comprises a water storage tank, the water storage tank is connected with a water pump, the water pump is connected with one ends of a plurality of water supply valves through one-way valves, and the other ends of the water supply valves are connected with rock bins in a one-to-one correspondence mode; the rock bins are vertically installed on the side wall of the simulation drilling pipe. Flange end covers are installed at the two ends of the simulation drilling pipe respectively, a water return opening sealing head is installed on the flange end cover at the tail end of the simulation drilling pipe, and the water return opening sealing head is connected with the water storage tank through a water return valve to return water. An energy storage pressure stabilizer is further arranged between the water storage tank and one end of each water supply valve. A sound wave sensing armored optical cable is coaxially installed in the simulation drilling pipe. Various geological and hydrological conditions in an actual underground rock stratum environment can be effectively simulated, the exploration precision of a water-rich layer section is improved by analyzing the change rule of sound wave signals, and reliable technical support is provided for coal mine water disaster prevention and control and safe production.

The utility model provides a PCW system integrated water return valve group device for semiconductor production, which comprises a pipe joint, a movable joint A, a stop valve, a detection device, a flow meter and a movable joint D. The pipe joint is in threaded connection with the movable joint A through a joint nut A. The other end of the movable joint A is connected with the stop valve, the other end of the stop valve is connected with the detection device, and the flow meter is connected with the detection device. The other end of the detection device is connected with a movable joint B, the movable joint B is connected with a movable joint C I through a joint nut B, the other end of the movable joint C I is in threaded connection with a flowmeter, the other end of the flowmeter is in threaded connection with a movable joint C II, and the other end of the movable joint C II is in threaded connection with a movable joint D through a joint nut C. By means of the integrated modular design, installation is rapid and convenient, the construction period is shortened, the fool-proof effect is good, all assemblies are connected in a threaded welding mode, pipeline combination points are reduced, and the hidden danger of pipeline leakage is greatly reduced.

The invention discloses a miniaturized high-flow high-pressure high-dew-point saturated gas generating device which comprises a mass flow controller, a first pressure controller, a pre-saturator, a gas inlet pipeline, a saturator, a second pressure controller, a water inlet valve, a water return valve, a constant-temperature water tank and a circulating water path, the mass flow controller controls the flow of input unsaturated gas and is connected with the pre-saturator through the first pressure controller, the pre-saturator is used for generating supersaturated moisture, the saturator is connected with the pre-saturator through a gas inlet pipeline, the supersaturated moisture generated by the pre-saturator is condensed, saturated moisture is output, and the saturated moisture is stored in the pre-saturator. The second pressure controller is connected with the saturator, the air outlet pressure of the saturator is controlled by controlling the outlet pressure, the constant-temperature water tank generates circulating water with constant and adjustable temperature, and the circulating water path conveys the circulating water generated by the constant-temperature water tank to the saturator to provide a constant-temperature environment for the saturator. High-flow, high-pressure, high-dew-point and high-stability saturated moisture generation can be realized.

The utility model relates to U type water seal technical field, concretely is a kind of anti-freezing U type water seal structure, the utility model discloses to solve the problem that many defects exist in current U type water seal, therefore provides a new anti-freezing U type water seal structure, including U type water seal body, water supply pipeline, return water pipeline, U type overflow water seal and vertically arranged water replenishing pipeline, return water pipeline, water supply pipeline, water inlet, the upper pipe mouth of water replenishing pipeline is connected by four-way joint, return water valve is equipped on return water pipeline, water replenishing valve is equipped on water replenishing pipeline, the lower pipe mouth of water replenishing pipeline, overflow pipe mouth, U type overflow water seal is connected by three-way joint, the bottom of U type overflow water seal is equipped with overflow drain pipe mouth, overflow drain pipe mouth is equipped with overflow drain valve, and drain pipe mouth is also equipped with drain valve. The structure is simple, and manufacturing cost is low.

The utility model discloses a high-heat quick-heating pressure-resistant water heating blanket ground mat which comprises a ground mat body and a controller, a water inlet and a water outlet are formed in the positions, close to the left side and the right side, of the outer wall of the front end of the ground mat body respectively, and a water return valve is fixedly connected to the position, close to the lower side, of the outer wall of the front end of the controller. A water outlet valve is arranged on the right side of the water return valve, a parallel water path grid is arranged in the floor mat body, a traditional U-shaped tubular water path is improved into the existing parallel water path grid, when a small-area foreign matter presses the floor mat, the situation that water flow in the water path is blocked can be avoided, and the water flow can normally flow for heating; meanwhile, the parallel water path grids are better in heat dissipation effect and higher in speed when water flows through, the heat dissipation effect is three times that of a traditional water heating blanket, temperature rise can be accelerated, the whole ground mat can be more evenly filled with the heat dissipation effect, and a stable and good closed-loop water path is formed.

The utility model provides an oscillatory artificial rainfall simulation device which comprises a support frame, an oscillating device and an oscillating device, the output end of the linear driver is arranged in the length direction of the supporting frame; a transmission rod; the at least one group of connecting components are connected to the transmission rod; the spray head limiting blocks are fixed to the supporting frame and correspond to the moving pieces one to one, and a water return opening is further formed in one side of the bottom of each spray head limiting block; the rainfall spray head is inserted into the spray head limiting block and hinged to the spray head limiting block, and the rainfall spray head is hinged to the connecting assembly through a spray head fixing clamp; a water storage tank; a return water collecting pipe; a water return branch pipe; a water supply branch pipe; a water supply pump, a pressure gauge and a water pressure regulator; a water supply flow regulating valve; and a water return valve. According to the utility model, the rainfall spray head is driven by the linear driver to realize oscillatory swing so as to simulate rainfall.

An embodiment of the present invention discloses a system for confluence and parallel piping of a circulating loop between multiple buildings in a park and a control method thereof. The system includes a pipe network control unit and a common return pipe. Each building in the park is provided with a circulating partition, and the return water pipes of the circulating partitions are all connected to the common return pipe. A return water valve and a pressure gauge are arranged on the return water pipes of the circulating partitions before connecting to the common return pipe. The present invention avoids difficult hydraulic calculations and head loss estimations, but realizes an ideal flow balance result by monitoring and adjusting the actual process. The method is simple and efficient, has high engineering application value, and also shows good effectiveness and feasibility through engineering practice. The application of the present invention can also enhance the engineering feasibility and scheme flexibility of building a direct drinking water system for pipelines in a large office building park.

The variable-amplitude sprinkling pipeline system comprises a power output system, a pump water inlet pipeline, a pump water outlet pipeline and a variable-amplitude water return pipeline, the power output system comprises a side power takeoff, one side of the side power takeoff is connected with a transmission shaft, and one side of the transmission shaft is connected with a sprinkling pump; the water outlet main pipe is communicated with a front spraying pipe, the front spraying pipe is further provided with a first valve driving device used for controlling the opening degree of the front spraying main valve, and one end of the front spraying pipe is communicated with a front spraying pipeline; the variable-amplitude water return pipeline comprises a return pipe connected with the water outlet main pipe, one side of the return pipe is communicated with a first return pipe, the first return pipe is provided with a first return valve and a variable-amplitude return valve, and the first return pipe is further provided with a second valve driving device for controlling the opening degree of the variable-amplitude return valve. Through the design of the variable-amplitude water return pipeline, flexible adjustment of the watering amount and the watering range is achieved, and the problems that when a traditional watering cart works on a narrow road, water resources are wasted, pedestrians are affected, and the working efficiency is reduced are solved.

The utility model relates to the technical field of water pumps, in particular to a self-priming pump which comprises a pump body, a water inlet and a water outlet are arranged on the pump body, a water inlet pipe is arranged in the pump body, one end of the water inlet pipe is communicated with the water inlet, and the other end of the water inlet pipe is used for being connected with an impeller. A communicating pipe is arranged on the upper portion of the water inlet pipe and enables the water inlet pipe to be communicated with the interior of the pump body, the impeller can introduce media into the pump body from the water inlet, a water return opening is formed in the bottom of the water inlet pipe and communicated with the interior of the pump body, and a water return valve used for opening and closing the water return opening is arranged at the water return opening. The design of the water return valve realizes the accurate control of the water return port, the water return valve can be closed as required to prevent the influence on the extraction flow, and the water return valve can also be opened during self-suction to assist the discharge of air, so that the self-suction efficiency is improved, and the reliability and flexibility of the whole system are improved.

A hot water preparation device comprises a hot water storage tank, an outlet of the hot water storage tank is connected with an inlet of a first discharging pump through a pipeline, an outlet of the first discharging pump is connected with an inlet of a first heating device through a pipeline, and an outlet of the first heating device is connected with an inlet of a first water return valve through a pipeline. A second temperature sensor and a first water consumption point are sequentially arranged on the pipeline between the first heating device and the first water return valve, and an outlet of the first water return valve is connected with an inlet of the hot water storage tank through a pipeline; an outlet of the hot water storage tank is connected with an inlet of a second discharging pump through a pipeline; and an outlet of the second discharging pump is connected with an inlet of a second heating device through a pipeline. According to the utility model, the plurality of heating pipelines and the plurality of temperature sensors are arranged, so that a plurality of different temperature requirements are met through one hot water storage tank, the occupied area is reduced, and the energy waste is reduced.

The utility model relates to a boiler water heating system, and belongs to the technical field of heat energy recovery. Comprising a heat exchanger, and an inlet and an outlet of the heat exchanger are provided with a water inlet valve and a water outlet valve respectively; the heat exchanger is provided with a flue gas inlet and a flue gas outlet; the water inlet valve is connected with the demineralized water storage tank through a pipeline; the water outlet valve is connected with the high-pressure deaerator through a pipeline, and a water return valve is arranged on the pipeline; at least one circulating pipeline is arranged between the water outlet valve and the water return valve; the circulating pipeline is connected with the water inlet valve; and an electric circulating valve and a booster pump are arranged on the circulating pipeline. According to the utility model, the flue gas discharged by the high-pressure boiler can be effectively utilized, heat in the flue gas is absorbed and used for heating demineralized water, and the steam consumption of the high-pressure deaerator is reduced, so that the aim of fully utilizing the heat of the flue gas is fulfilled.

The utility model discloses a pump body with a self-suction function, and relates to the technical field of water pumps, the pump body comprises a pump shell, a multi-stage impeller mechanism is arranged in the pump shell, a rotating shaft on the multi-stage impeller mechanism is driven by a motor, and a water inlet hole, a main water return hole and a water inlet of the multi-stage impeller mechanism are communicated through a water inlet cavity; the device further comprises a check valve mechanism and a water return valve mechanism. The check valve mechanism comprises a check valve seat, the check valve seat is in spiral connection with the water inlet hole, a movable check valve element is arranged on the check valve seat, a check valve elastic piece, a check valve nut and a check valve sealing gasket are arranged on the check valve element, the check valve nut is in spiral connection with the check valve element, one end of the check valve elastic piece abuts against the check valve nut, and the other end of the check valve elastic piece abuts against the check valve sealing gasket. The other end of the spring abuts against the check valve seat; and the water inlet is respectively communicated with the water outlet hole and the auxiliary water return hole through the water outlet cavity. The check valve mechanism is convenient to disassemble and assemble; and a better self-suction operation effect is achieved.

This utility model discloses a dual-temperature water outlet heat exchange station and heat exchange system for a centralized heat source, including an inlet valve, a return valve, a mixing valve, a water pump, a three-way valve, a heat exchanger, a heating inlet, a heating return outlet, a bathroom outlet, a bathroom inlet, a first medium inlet, and a first medium return outlet. The heat exchange station has heating and bathroom modes. In heating mode, the first medium inlet, inlet valve, mixing valve, and heating inlet are connected to form a first flow path for the first medium, and the heating return outlet, water pump, return valve, and first medium return outlet are connected to form a second flow path for the first medium. In bathroom mode, the first medium inlet, inlet valve, mixing valve, heat exchanger, water pump, return valve, and first medium return outlet are connected to form a third flow path for the first medium, and the bathroom inlet, heat exchanger, and bathroom outlet are connected to form a second medium flow path. The three-way valve allows the mixing valve to switch between the heating inlet and the heat exchanger. This utility model reduces the number of parts and pipes, has a simple structure, and low cost.

The utility model discloses a multifunctional gravel filter which comprises a bin body, a water inlet pipe is fixedly connected to the upper portion of the bin body, a water inlet valve is arranged on the right side of the water inlet pipe, a water return pipe is fixedly connected to the lower portion of the right side of the bin body, a water return valve is arranged on the upper portion of the water return pipe, and a water outlet pipe is fixedly connected to the bottom of the bin body. A water outlet valve is arranged on the right side of the water outlet pipe, a connecting pipe is fixedly connected to the lower portion of the water outlet pipe, and a sterilization device is arranged at the other end of the connecting pipe. The interior of the bin body is fixedly connected with a supporting plate, and the upper portion of the supporting plate is fixedly connected with a flow slowing pipe. By means of the structure, impurities in water can be filtered, organic matter and other substances still remaining in the water can be filtered and killed at the same time, water flow can stably enter the filter layers in the back-flushing process, the small-particle-size filter layer can be prevented from entering the large-particle-size filter layer, and back-flushing work is smoother.

The utility model discloses a railway vehicle water tank water tightness detection tool, and relates to the technical field of railway vehicles, the tool comprises a pressure maintaining mobile trolley, a test circulating water storage tank is arranged in the pressure maintaining mobile trolley, and the top surface of the test circulating water storage tank is communicated with a transparent backwater observation hose, a water feeding pipe and a water return pipe; a flange extension pipe is arranged in the circulating water storage tank for the test; an electric control cabinet, an electric low-flow pressure test pump, a PP cotton filter, a first stop valve, an electric control digital display precision pressure gauge, a signal loop and a water return valve are arranged in the pressurizing electrical module; a test water tank support frame; the electric low-flow pressure test pump, the PP cotton filter and the first stop valve are sequentially communicated through a communicating pipe, and the electric control digital display precision pressure gauge is communicated with the communicating pipe between the PP cotton filter and the first stop valve. The pressurizing device and the water tank are combined and matched with the auxiliary component, so that the water tightness pressure maintaining detection requirement of the water tank product on the railway vehicle is met.

The invention relates to the technical field of water heater zero cold water control, and discloses a water heater preheating control method and device, a controller and a water heater. The method is applied to the water heater and comprises the steps that a water pump of the water heater is controlled to be started in response to a preheating request of the water heater; the real-time circulating water flow of the water heater is detected; when the real-time circulating water flow is larger than the set starting flow, the water heater is controlled to ignite and heat; on the basis of the real-time circulating water flow, the opening and closing state of the temperature control water return valve is judged, and when the temperature control water return valve is in the opening state, an outer circulating pipeline of the water heater forms a passage. Therefore, when it is judged that the temperature control water return valve is in the closed state, the water pump is controlled to be closed, and heating is stopped. The water heater can timely recognize closing of the mechanical temperature control water return valve, timely stops operation of the water pump, and prevents the water pump from being damaged due to overheating.