4 results about "Residual pressure" patented technology

The application discloses a differential pressure type gas pipeline leakage measuring and controlling device and method, and relates to the technical field of gas pipeline safety monitoring. The device comprises an inlet electromagnetic valve, an outlet electromagnetic valve, a differential pressure transmitter, a control module and a communication module; the two valves are connected in series along the airflow direction, and the differential pressure transmitter collects the differential pressure signal between the two ends of the outlet electromagnetic valve. In the on state, the differential pressure signal is collected to identify large leakage and medium leakage; in the off state, the differential pressure change is collected through a tightness test to identify large and small micro-leakage. The method is divided into a non-disturbance tightness test and a disturbance tightness test, and is automatically executed in a non-gas use period. The method has high sensitivity, low false alarm rate and does not affect the gas use of users. The application can cover all scenarios of courtyard, building, vertical pipe, household, overhead and buried gas pipelines, effectively solves the problems that the prior art cannot identify large and medium leakage with high residual pressure, has insufficient sensitivity and is interfered by tests, and improves the operation safety of the gas pipeline.

The high-pressure-resistant plastic pipe comprises a pipe body, the pipe body is sequentially provided with a flow guide layer, a buffer layer, a reinforcing layer and a protective layer from inside to outside, protrusions used for flow guide are integrally formed on the inner wall of the flow guide layer, and flow dividing cavities are formed in the protrusions at intervals. And a water inlet and a water outlet are respectively formed in the bulge and correspond to the shunting cavity. Through the collaborative design of the flow guide layer, the buffer layer, the enhancement layer and the protection layer, step-by-step dissolution of pressure and efficient regulation of water flow are achieved, protrusions of the flow guide layer are matched with the flow dividing cavities, water flow impact is weakened, turbulent flow is avoided, stepped absorption of the pressure is achieved through the gradient honeycomb structure of the buffer layer, and the flow dividing effect is improved. The three-dimensional stress network of the reinforcing layer disperses residual pressure, finally, the risk of local stress concentration of the pipe body is greatly reduced, compared with a traditional single-structure pipe, the operation stability under the high-pressure working condition is remarkably improved, and the problems of cracking and leakage caused by pressure overload are effectively avoided.

The utility model discloses an automatic pressure relief sealing valve for birch juice transport vehicle, including valve seat, both sides of the top of valve seat all are fixedly connected with connecting seat, be provided with water delivery cavity in the valve seat and connecting seat, the top fixedly connected with valve body of connecting seat, the bottom of valve seat is provided with water inlet, water inlet is linked together with water delivery cavity, the bottom of one side of valve body is provided with water outlet, the top of valve body is provided with drain in water outlet, the inside movable joint of valve body has the piston, the top of piston is provided with valve rod, the utility model relates to valve technical field, solved in the prior art, the valve after closing water supply, in the equipment use process, often can accumulate certain pressure in the inside pipe, if these residual pressure does not release in time, possibly cause damage to the valve itself, also can influence the stable operation of entire water supply system, even cause the problem of security hidden danger.

The intelligent residual pressure monitoring device comprises a residual pressure sensor, a mounting plate, a sealing cover, a cover opening and closing control mechanism, a single-chip microcomputer, an electromagnetic valve and a pump machine, the residual pressure sensor is mounted on the surface of the mounting plate, the sealing cover is mounted on the mounting plate, the residual pressure sensor is covered with the sealing cover, the cover opening and closing control mechanism is connected with the sealing cover, and the single-chip microcomputer is connected with the electromagnetic valve. The sealing cover is sequentially connected with an electromagnetic valve and a pump machine through a pipeline, and the residual pressure sensor, the cover opening and closing control mechanism, the electromagnetic valve and the pump machine are all electrically connected with a single chip microcomputer; according to the technical scheme, the cover opening and closing control mechanism closes the sealing cover, standard pressure (such as 0Pa, 50Pa and 100Pa) is generated and injected into the sealing cover for calibration reference under the cooperation of the pump machine and the electromagnetic valve, the output of the residual pressure sensor is corrected through linear regression, data before and after calibration are compared, and calibration is repeated if the error is greater than 1Pa, so that automatic calibration of the residual pressure sensor is realized, and the calibration accuracy is improved. And the reliability of the residual pressure monitoring device is improved.