19 results about "Double check valve" patented technology

The invention relates to the technical field of water meter equipment, in particular to a leakage-proof double-check-valve structure which comprises an upper shell and two check valves which are connected in series and are the same in structure, and core components of the check valves comprise check valve shells, tension springs, check valve covers, silica gel flat washers and sealing O-shaped rings. The rocker arm type structure is matched with the design of the tension spring and matched with the concave chute, so that the movement range of the check valve clack is larger, the opening degree is remarkably improved during forward flow, the flow area is increased, the fluid resistance is reduced, the pressure drop loss is reduced, the check valve clack can be rapidly pulled back through the tension spring during reverse flow, a flow path is cut off, the water hammer phenomenon can be effectively prevented, and meanwhile, the water hammer phenomenon is effectively prevented. The opening and closing stroke of the valve clack of the check valve can be shorter through the angle fitting matching design of the inclined faces, flow guide or check can be rapidly achieved, the elastic fitting of the silica gel plane and the inclined faces is combined, microscopic gaps are effectively filled, efficient sealing under high pressure is achieved, opening and closing are flexible, and meanwhile pressure drop is smaller.

The dual one-way valve bidirectional throttling post-heat exchanger air conditioner water heater of the present invention includes: a compressor, a four-way valve, indoor and outdoor heat exchangers, a hot water heat exchanger, two one-way valves, two throttling devices, and a gas-liquid separator; characterized in that: the hot water heat exchanger is placed between the second ports of the indoor and outdoor heat exchangers, and is respectively connected to the second interfaces of the first and second directional flow throttling devices composed of one-way valves and capillary throttling devices; it has three operating modes: hot water production, cooling, and heating; and the cooling circulation pipeline is connected to the cooling process. The sequence is: compressor, four-way valve, outdoor heat exchanger, first check valve, hot water heat exchanger, second throttle, indoor heat exchanger, four-way valve, gas-liquid separator, compressor; the four-way valve switches positions during the heating cycle; in the first operating mode, the heating cycle is executed, the compressor and outdoor fan run, the indoor fan stops, and hot water is produced quickly; in the second mode, the cooling cycle produces cooling gas; in the third mode, the heating cycle provides heating; in the second and third operating modes, the compressor, indoor and outdoor fans all run, and the hot water heat exchanger recovers the subcooled liquid, obviously producing hot water slowly.

The utility model belongs to the technical field of condensate conveying and heat exchange, and particularly relates to a condensate conveying and heat exchange system of a double-air-source floating ball power pump. The condensate conveying heat exchange system of the double-gas-source floating ball power pump comprises a tower bottom reboiler, the tower bottom reboiler is connected with a heating steam pipeline, and a pipeline connected with a collecting pipe is arranged at the bottom of the tower bottom reboiler; the collecting pipe is connected with the power pump set, and the power pump set is connected with the hot water heater through a top steam exhaust pipeline; a condensate outlet at the bottom of the hot water heater is provided with a pipeline flowing back to the collecting pipe, and the pipeline is provided with a thermometer. According to the condensate conveying and heat exchange system with the double-air-source floating ball power pumps, the design that the three floating ball power pumps are connected in parallel with the double air sources is adopted, and the Y-shaped filter and the double check valves are arranged, so that the operation stability of the system is guaranteed; meanwhile, the hot water heater is arranged, the utilization rate of steam waste heat is increased, the bypass is arranged at the hot water heater, loop control over the temperature control valve and the thermometer is achieved, and stable backflow of condensate is guaranteed.

A bias double check valve is provided to receive a pressurized medium at a supply port from a pressurized system. The bias double check valve comprises a first check valve configured to regulate the pressure of a delivery port, and a second check valve configured to relieve pressure of the delivery port. The first check valve further comprises a biasing spring that may be adjusted to achieve a predetermined pressure value in the delivery port. The first check valve and the second check valve are integrated into a single housing allowing the bias double check valve to be easily integrated and replaced in the pressurized system.

The invention discloses a pressure maintaining valve performance detection test bench suitable for multiple working conditions, and the test bench comprises a bench body which is provided with a multi-medium anti-backflow supply module, a high-temperature and high-pressure steam generation module, and a control and data collection module. A medium supply design of a three-way valve and a double one-way valve is adopted, a high-pressure nitrogen gas source and clean industrial water are respectively connected, and multi-medium non-countercurrent switching supply is realized; a high-temperature test box and a medium storage tank are taken as a core, clean industrial water is injected into the medium storage tank and is heated by the high-temperature test box to generate high-pressure superheated steam, and the high-temperature and high-pressure requirements of special working conditions can be met; meanwhile, the control cabinet serves as a core, data acquisition is conducted through the first pressure gauge, the second pressure gauge and the flow meter, automatic control over the test process and integration of real-time data acquisition, storage and analysis are achieved, and the detection efficiency, detection accuracy and comprehensiveness of the pressure maintaining valve are improved. In addition, the pressure maintaining valve detection method provided by the invention has the above effects.

The utility model provides a pressure-adjustable quick connection hose, and belongs to the technical field of pipeline connecting pieces. The quick-connection hose solves the problem that an existing quick-connection hose does not have a pressure adjusting function. The pressure-adjustable quick connection hose comprises a connection hose body, the two ends of the connection hose body communicate with double-ear caps, the surface of the double-ear cap on the left side is movably sleeved with a double-non-return straight-through ball valve, the surface of the double-ear cap on the right side is movably sleeved with an isolation valve, and inner cavities of the double-non-return straight-through ball valve and the isolation valve are each provided with a filtering mechanism. A reinforcing mechanism is arranged on the side, opposite to the double-check straight-through ball valve, of the isolating valve, a threaded sleeve is arranged on the side, opposite to the double-check straight-through ball valve, of the isolating valve in a threaded sleeving mode, a connecting sleeve is movably installed in an inner cavity of the threaded sleeve, and the reinforcing mechanism comprises a reinforcing clamping frame; the reinforcing clamping frames are movably arranged on the surfaces of the double-check straight-through ball valve and the isolating valve in a sleeving mode respectively. The utility model has the advantage that the pressure of equipment is convenient to adjust.

This invention relates to the field of injection bridge plug technology, specifically disclosing a double check valve injection bridge plug for high-pressure oil and gas wells. The plug includes: an injection bridge plug, a central tube, receiving grooves, an injection mechanism, an injection chamber, injection orifices, and a piston chamber. An injection chamber is formed on the rear side of the inner cavity of the injection bridge plug. Several injection orifices are equidistantly spaced along the circumferential direction on the inner wall of the injection chamber. A piston chamber communicating with the inner cavity of the injection chamber is formed on the middle of the rear side of the injection bridge plug. The central tube is located in the middle of the inner cavity of the injection bridge plug. Two receiving grooves are formed along the circumferential direction from front to back on the rear side of the inner wall of the central tube. The injection mechanism is located in the inner cavity of the central tube. This device completely solves the cement backflow problem by employing double check valves and self-reinforcing seals. It achieves visualized and controllable operation through full-process downhole pressure monitoring. The pure mechanical linkage structure improves operational reliability and downhole adaptability, significantly reducing operational risks and engineering costs, and improving the success rate and safety of plugging operations.

This invention relates to the field of valve technology, specifically to a check valve structure with a cleaning mechanism, comprising a valve body, a flow port, a valve seat, a through hole, a sealing valve disc, a guide member, a compression spring, and a fixed seat mounted on the valve body within the flow port; cleaning plates hinged to each fixed seat; and reset limiting mechanisms respectively disposed between each cleaning plate and the fixed seat. Through the cooperation of the fluid medium's conveying force and the compression spring, the sealing valve disc in the check valve cleans impurities from its surroundings during its reciprocating rise and fall, reducing the adhesion of impurities such as mud, rust, welding slag, oil, and calcium and magnesium deposits. This cleaning of impurities facilitates a tight fit between the periphery of the sealing valve disc and the through hole, reducing the occurrence of impurities being brought into the sealing surface and causing check valve sealing failure, further improving the sealing effect of the double check valve structure.

A service brake control system for a combination vehicle including a towing member and first and second towed members includes an electro-pneumatic brake control valve on the first towed member that delivers fluid pressure through a delivery port in response to an electronic control signal that is generated by a brake controller on the towing member. A double check valve includes a first supply port in fluid communication with a forward fluid coupling on the first towed member that delivers a first fluid control signal from the towing member, a second supply port in fluid communication with the delivery port of the electro-pneumatic brake control valve and a delivery port in fluid communication with a rear fluid coupling on the first towed member that delivers a second fluid control signal from the double check valve to the second towed member.

The utility model discloses a small size check valve, first valve core chamber is linked with the liquid inlet chamber and is provided with the transition structure of horn shape in the communication part, and the left side fixed setting of second valve body has the nut, and the right side of first valve body is connected with second valve body through the screw thread, and the inside of second valve body is provided with the liquid outlet chamber of penetration, the utility model discloses the mode of first valve body, second valve body limit fixed support seat, has saved the independent fixed limit structure, has saved the space that fixed limit structure occupies, can shorten the length of check valve, is convenient for the internal assembly and arrangement of check valve in excavator, and the device still realizes two stage pressure self -adaptation opening valve core through being provided with the mode of valve core, can realize low pressure sensitive response or the function of pressure relief to the impact of hydraulic oil, reduces the volume of double check valve simultaneously, is convenient for the internal assembly and arrangement of check valve in excavator.

This application discloses a high-service-life composite double check valve, relating to the field of valves, comprising a valve body, a valve cover, a valve plate, and a compression spring. The valve plate has a first-pass opening, and a guide tube communicating with the first-pass opening is provided on the side of the valve plate near the inlet end of the valve body. The guide tube has an inner edge on the side away from the valve plate, and a first-pass valve plate is provided inside the guide tube, abutting against the inner edge of the guide tube. The compression spring includes a first compression spring and a second compression spring arranged concentrically, with a neutral pressure plate connecting the first compression spring and the second compression spring. The end of the second compression spring away from the neutral pressure plate is connected to the first-pass valve plate, and the neutral pressure plate abuts against the edge of the first-pass opening. The first compression spring is in a pre-compressed deformation state. Under a fixed service life, the first-pass valve plate and the valve plate respectively function as opening and closing elements, reducing the time that a single opening and closing element is subjected to fluid scouring, thereby extending the service life of the check valve.

A pneumatic double check valve comprising a valve body having a longitudinal axis, a cavity, a first inlet opening, a second inlet opening and an outlet opening, the cavity being in fluid communication with the first inlet opening, the second inlet opening and the outlet opening. A first and a second shuttle are placed within the valve body, and a preloaded helical spring is interposed between and acting on them. The first and second shuttles are movable, by loading with pneumatic-induced pressures greater than respective shuttle crack off pressures, between first and second positions spaced therefrom, so that to alternatively close and open the first and the second inlet openings, respectively. The pneumatic double check valve is designed to avoid shuttle swimming failure, improve response time behaviour and facilitate port interchangeability.

The utility model discloses a sole of active exhaust driven by gait, including the upper layer of insole with the flow guide groove, the bottom layer of insole with the exhaust groove and check valve, and with the insole sealed connection big bottom. The wearer walks or runs in the process, and the heel is grounded to make the air storehouse of insole rear part produce deformation and form negative pressure, inhale the air in the shoe and pass through double check valve structure one -way discharge. Without external power supply, the structure light weight, promotes the ventilation efficiency and the wearing comfort in the shoe, is applicable to the scene such as sports shoes, work shoes.

The utility model discloses a cold and hot temperature regulating concealed switch valve which comprises a cassette seat, a main body part, a cassette cover, a protective cover, a panel part and a handle, the cassette cover and the cassette seat are installed together, and the main body part is installed on the cassette seat and located in the cassette cover; the main body part comprises an upper water diversion main body, a lower water diversion main body and a cold and hot mixing main body; the cold and hot mixing main body is provided with a cold water inlet, a hot water inlet and a switch valve component for controlling the cold water inlet and the hot water inlet to open and close; the upper end of the cold-hot mixing main body is communicated with a shower through an upper water diversion main body, and the lower end is communicated with a shower through a lower water diversion main body; the upper water distribution main body and the lower water distribution main body are structurally symmetrical, the two water distribution main bodies are provided with key valve elements, and opening and closing of the two key valve elements are independently controlled and do not interfere with each other. The upper and lower water diversion main body structures of the device are symmetrical, the upper and lower water diversion main bodies can be assembled reversely and can be practical, and the double check valves can prevent cold and hot water from mixing and prevent cold and hot water from being cold and hot; a user can enjoy the top spraying function and the hand lifting function at the same time, and two persons can take a bath conveniently.

The invention discloses an offshore platform chemical agent injection flow distribution system which comprises an agent tank, an agent injection pump, a main conveying pipeline, a distribution manifold and a plurality of branch pipelines, and the main conveying pipeline is communicated with the branch pipelines through the distribution manifold; the inlet end of the medicament injection pump is communicated with the medicament tank, the outlet end of the medicament injection pump is connected with a first branch and a second branch, the first branch is injected into the plurality of branch pipelines through the main conveying pipeline and the distribution manifold, and the second branch flows to the medicament tank through the return valve; each branch pipeline is sequentially provided with a flow control valve, a first flow meter, a switching valve and a double-one-way valve, the first flow meter is in signal connection with the flow control valve so that the opening degree of the flow control valve can be conveniently adjusted, and the device has the advantages of being simplified in structure and accurate in flow.

A double check valve (100) includes a sleeve (10) with a first inlet opening (11), a second inlet opening (12), an outlet opening (13), and a guide piece (20). The guide piece (20) movable along the longitudinal axis (L) within the sleeve (10), by loading with a fluid-induced pressure, between a first blocking position (S1) and a second blocking position (S2) spaced therefrom, wherein each of the inlet openings (11, 12) is closed at least partly fluid-tightly by the guide piece (20) in one of the blocking positions (S1, S2). The double check valve (100) has a permanent magnet (30, 31, 32, 33), and the guide piece (20) and the permanent magnet (30, 31, 32, 33) are configured to magnetically deflect the guide piece (20) from an intermediate position (Z) arranged between the blocking positions (S1, S2) and / or from one of the two blocking positions (S1, S2).

1. Name of the designed product: Double check valve (improved type). 2. Use of the designed product: Double check for pipe system. 3. Design points of the designed product: In shape. 4. Picture or photo that best shows the design points: Perspective view.

A pneumatic double check valve comprising a valve body having a longitudinal axis, a cavity, a first inlet opening, a second inlet opening and an outlet opening, the cavity being in fluid communication with the first inlet opening, the second inlet opening and the outlet opening. A sleeve is placed inside the cavity of the valve body and a shuttle is movable therein, when loaded with pneumatic-induced pressures greater than the shuttle crack off pressure, between first and second positions spaced therefrom, so that to alternatively close and open the first and the second inlet openings, respectively. The sleeve comprises annular lip seals having a crack off pressure that is greater than the shuttle crack off pressure. The pneumatic double check valve is designed to avoid shuttle swimming failure, improve response time behaviour and facilitate port interchangeability.

The application discloses a water pump with a built-in mechanical one-way valve double check valve function, comprising a water inlet control assembly and an electromagnetic drive pumping assembly connected with each other, wherein the water inlet control assembly comprises a first valve body, a first plug, a first elastic member, a diaphragm and a top opening member; the electromagnetic drive pumping assembly comprises a second valve body, a movable core, a coil, a second plug and a third plug arranged on a water outlet channel; the diaphragm divides a first cavity in the water inlet control assembly into a first chamber communicated with the atmosphere and a second chamber communicated with the electromagnetic drive pumping assembly; when the coil is powered, the movable core moves to generate negative pressure in the second chamber; the diaphragm drives the top opening member to push away the first plug, and the second plug and the third plug are opened at the same time; when the coil is powered off, the movable core resets, and the three plugs respectively close corresponding channels. The pump and the double check valve are integrated, double physical separation of the water inlet end and the water outlet end is realized when the coil is powered off, and backflow prevention is reliable.