Shanghai valve manufacturing co. , LTD. , production of the holding type butterfly valve with a heavy hammer. The system put into use in random group in 1999, has 13 years operation, BFS++ defect a total of 137 items, mainly lifting hydraulic cannot keep, frequent start oil pump, leakage of hydraulic components, Industrial Valves steal defects such as closed. These shortcomings and hidden danger seriously affects the safe operation of the unit. In December 2012, Beijing thermoelectric branch of the four sets of the butterfly valve hydraulic control system of the export of hardware and software. By the analysis of control system after reforming, there are still some hidden troubles and problems in so need to continue to develop and control system. The working process of the working principle of the circulation pump outlet butterfly valve: ( 1) Heavy hammer pressure butterfly valve, the pump starts, the oil in the high pressure oil filter, one-way valve, into the oil cylinder, moves the pistons, drive connected to the lever lifting heavy hammer to open valve. Open valve action in place after the travel switch, automatic pressure maintaining system startup, motor pressure accumulator charging - to continue. After the pressure of high pressure set point ( 16MPa） Stop running, the oil pump. System leakage, pressure to low pressure set point ( 4MPa） Automatic startup, the oil pump motor, stop the pump after high pressure setting. （ 2) Heavy hammer pressure butterfly valve, has the close the valve. , electric magnetic valve, the heavy hammer under the action of gravity oil in the hydraulic oil cylinder by the throttle valve, high pressure hose, electromagnetic valve back to tank. （ 3) When the solenoid valve failure or power failure, can be operated manually. Manual, directly open the valve. Close the valve when open the cut-off valve, oil cylinder oil in a heavy hammer gravity low back to the fuel tank, the valve closed. Contains a Siemens S7 - hydraulic control system 200 series PLC, a solenoid valve and a range of 0 ~ 20 mpa rosemount pressure transmitter. Solenoid valve used to control the closing of the butterfly valve; A control system of hydraulic pressure transmitter is not higher than 16 mpa, not less than 4 mpa. The circulation pump outlet butterfly valve switch design there are two ways. First way circulating pump and export butterfly valve interlock switch input state, the butterfly valve switch by the circulation pump interlock start-stop state; Second way circulation pump remove with the export of butterfly valve interlock switch state, through the control and in situ electric cabinet button, operational butterfly valve switch. Problems currently circulating pump outlet butterfly valve control system exist the following problems: circulating pump start-up state signal interference may exist, the circulating pump and export butterfly Industrial Valves interlock switch input cases, lead to butterfly valve maloperation. Has ever happened in the history of butterfly valve by accident caused by lightning thunderstorm day events. Butterfly valve switch button on the control room and on the electric cabinet directly control the switch of butterfly valve, there may be workers accidentally touch or butterfly valve maloperation caused of wrong operation. When the circulation pump shut down, if its export butterfly valve is opened, can make the circulating water flow back, serious when may lead to jump machine. System fill pressure constant value judgment is provided by the pressure transmitter signal, if the malfunction of the pressure transmitter is system constantly fill pressure may occur, if there is no reliable relief channel system may lead to hydraulic blowout. Therefore, we need to optimize the circulation pump outlet butterfly valve control system design, to ensure the normal circulation pump outlet butterfly valve switch. Solutions for the above points the problems in the circulation pump outlet butterfly Industrial Valves control system, puts forward the following technical solutions. The design of control program need to input signal interference shielding. Basic it is moment of signal interference, so the instantaneous input signal blocking in program design. Control systems need to prevent wrong operation design. Concrete in the control program can set the outlet butterfly valve atresia, namely only when circulating pump operation, its export butterfly valve to open. So you can avoid danger happening. Need to increase the security protection system for pressure, can't again at the same time limit system of the normal pressure. Concrete can be increased in the control program was compacted time constraints, but this time limit must be slightly longer than the time needed for the system normal fill pressure.
Most people who see a in operation for the first time are amazed at how well the os & y valve fire protection is managed.
We would appreciate your immediate attention to gate valve.
You will have a cast iron gate valve that looks os gate valve all the time, Because your is handling with it.
Shenzhen Mech Valve Trading Co., Ltd. offers the best for indoor as well as outdoor use. To find your ideal at attractive offers, visit us at Mech Valve.
rising stem gate valve can be great additions to companies looking to improve the well-being of their employees, as well as increase the efficiency and productivity of their workers across the organization.