Construction and pneumatic valve installation should pay attention to ( 2)

valve lift is by pneumatic valve stem head, thus change the pneumatic valve and pneumatic seat open and close the distance between the pneumatic valve control, the most widely in truncation of pneumatic valve used in the production of chemical by the pneumatic valve. Pneumatic valve is mainly used for water, steam, in the process of production of compressed air pipeline control, but does not apply to the crystallization of high viscosity material. Pneumatic valve structure more complicated, but simple and practical efforts to cut off the traffic control channels, has a better performance, slow opening and closing of water hammer phenomenon is very rare. By the pneumatic valve structure is compact, more obvious characteristics, and the handwheel and pneumatic pneumatic valve stem and packing with thread seal at the top of the middle section. Pneumatic valves open and close the pneumatic valve in use, to determine the country's main way is to observe the height of the dry shows pneumatic valve cover, to control the pneumatic valve operation. To connect to the pneumatic valve stem and valve cover there may be some difference, it's easy to have a medium leakage, it can be solved through the packaging. Little thread pneumatic valve stem in pneumatic valve body, therefore, the use and the media more contact time is long, easy to corrosion medium. Therefore, in order to prevent the pneumatic valve life is short, butterfly fairy, chief engineer with the door by the pneumatic valve installation refers to the direction of flow in a fluid at a low price right of tube, namely through the pneumatic valve seat from the bottom of the mouth. This installation's goal is to reduce the pneumatic valve body, thereby reducing the pneumatic valves open and close the fluid resistance, while maintaining the pneumatic valve stem is enclosed, filling don't contact with the media, in order to reduce loss and leak. Installed in the pneumatic valve should be aware of the following three points:, by the pneumatic valve leakage inspection before, in the open, to determine whether the defect of pneumatic valve leakage, filling is no leaking defects. , such as pneumatic valve stem operation cannot be done by hand, rather than using a dedicated F wrench, wrench, F in the case has not yet open, do not use longer wrench forced open and closed, or even to avoid damaging the pneumatic valve is safe accidents. , by the pneumatic valve is suitable for the medium pressure steam pipe condensate ruled out in the open, it is necessary, the steam pipe after preheating, preheating in pressure. 吗? 。 MPa relations remain unchanged, this is done to avoid temperature, was suddenly change, damage to the seals in determining the steady state after the pressure increase to the required level, caused by the pressure.