Where is a good instrument valve valve factory Hangzhou Tiandun I. Overview: meter valve is a pipeline accessories. It is used to change the channel section and flow direction of medium, a device for controlling the flow of the transmission medium. Meter valve sealing performance is part of the sealing means the instrument valves ability to prevent media leaks, it is the most important instrument valves technical performance indicators. Seal meter valve has three parts: opening and closing pieces and valve seat sealing surface contacts between the two; the filler stem and the stuffing of the distribution and office; the connection of body and bonnet. Which is called before a leak within the leak, which is commonly known as Guan lax, it will affect the ability of the instrument valve cut off media. For cut-off valve, the internal leakage is not allowed. Leakage after the two called the leak, that media leaks from the valve to the outside of the valve. Leakage will result in material losses, environmental pollution can also cause serious accidents. For flammable, toxic or radioactive medium, leakage is not allowed, so the meter valve must have a reliable sealing performance. Second, the principle: the regulator of the analog signal, known as analog meter valve. It determines the measured values ??in analog form controlled object parameter deviations given value, and generates an analog output signal push actuators eliminate bias adjustment based on certain rules, the controlled parameters remain in the vicinity of a given predetermined value or change the law. In the industrial automation instruments, instrumentation valves are often used on the output signal integrated instrumentation control the production process in order to achieve the purpose. The adjustable parameters include temperature, pressure, flow, level, composition and so on. Three purposes: (1) to connect or disconnect the line of media. Such as gate valves, globe valves, ball valves, plug valves, diaphragm valves, butterfly valves, etc. (2) regulation, control of pipeline flow and pressure of the medium. Such as throttle, regulating valves, valves, safety valves, etc. (3) change the direction of the flow of the pipeline media. Dispensing valve, three cocks, three or four-way ball valve. (4) to prevent the line of medium back. Various structures such as check valves, bottom valve. (5) separation medium. Such as steam traps variety of different structures, such as air traps. (6) and adjust the liquid level indication. As the liquid level indicator, liquid level controller and the like. (7) other special purposes. Such as temperature control valve, overcurrent emergency shut-off valve.