By the pneumatic valve advantages and disadvantages compared

the pneumatic valve is closed ( Pneumatic disc) Move along the center line of the pneumatic valve seat of pneumatic valve. According to the mobile form of pneumatic valve, pneumatic valve seat with pneumatic disc change in his itinerary directly proportional relationship. Because this pneumatic valve open or close the pneumatic valve stem travel relatively short, and very reliable cutting function, and due to the change of pneumatic seat his trip proportional relationship with the pneumatic valve, is very suitable for the traffic regulation. Therefore, this type of river closure by pneumatic valve pneumatic valve is very suitable for as a cut or adjust and throttling.
as pneumatic valve point:
. By the pneumatic valve has simple structure, manufacture and maintenance more convenient. 。 By the pneumatic valve working stroke is small, opening and closing time is short. 。 By the pneumatic valve sealing, sealing surface friction between the small, long service life.
as pneumatic valve disadvantages:
. By the pneumatic valve fluid resistance is big, required when opening and closing force is larger. 。 By the pneumatic valve is not applicable to medium with larger particles, viscosity, easy to coking. 。 By the pneumatic valve and poor regulation performance. As the types of pneumatic valve according to the position of the pneumatic valve stem thread points have male type by the pneumatic valve, the female by the pneumatic valve. According to the flow of medium, have straight-through as pneumatic valve, pneumatic valve and Angle type once-through deadline by the pneumatic valve.
as pneumatic valve, the form of the seal packing seal by the pneumatic valve and pneumatic valve bellows seal globe.
as pneumatic valve installation and maintenance should be paid attention to the following:
the handwheel, handle the operation by the pneumatic valve can be installed in any position. 。 The handwheel, handle and wei mechanism, does not allow for lifting. 。 The flow of medium should be consistent with the direction arrow shown in pneumatic valve body. As the purpose of the pneumatic valve by pneumatic valve is closed ( Pneumatic disc along the center line of the pneumatic valve seat mobile pneumatic valves.
according to the mobile form of pneumatic valve, pneumatic valve seat with pneumatic disc change in his itinerary directly proportional relationship. Because this pneumatic valve open or close the pneumatic valve stem travel relatively short, and very reliable cutting function, and due to the change of pneumatic seat his trip proportional relationship with the pneumatic valve, is very suitable for the traffic regulation. Therefore, this type of pneumatic valves are well suited for use as cut off or adjust and throttling.
as pneumatic valve pneumatic disc once away from the closed position, it is no longer between pneumatic seat and clapper sealing surfaces have a contact, thus its sealing surface mechanical wear and tear is small, so the sealing performance is good, the disadvantage is that between the sealing surface may be in liquid medium particles. However, if the pneumatic disc to make steel ball or ceramic ball, the problem is solution of the struggle. Since many of the pneumatic valve pneumatic seat and disc is easier to repair or replacement, and repair or replacement of packing element without the whole pneumatic valves are removed from the pipeline, in the pneumatic valve and pipeline welding into one occasion is very applicable. Due to the flow direction of medium through this kind of pneumatic valve has changed, so the minimum flow resistance by the pneumatic valve is higher than that of most other types of pneumatic valves. However, according to the aerodynamic body structure and pneumatic valve stem't relatively, the layout of the export channel, this situation can be improved. At the same time. Due to the trip between pneumatic valve open and close as small, sealing surface and can withstand the opening and closing, so it is very suitable for need frequent switch Settings. By the pneumatic valve can be used in most of the medium flow in the system. Has developed the petrochemical, electric power, metallurgy, urban construction, chemical industry and other departments of various USES various forms of the pneumatic valve. By the use of pneumatic valve is very common, but since the opening and closing torque is larger, the structure length is longer, the nominal diameter is usually restricted to mm below, also have to the mm, but the relative special attention should be paid to the import and export direction. Generally by the pneumatic valve Omm under medium are mostly from the bottom of the pneumatic valve inflow, pneumatic valve medium above Omm as mostly from the top of the pneumatic valve inflow. This is caused by considering the pneumatic valve closing torque. Opened or closed in order to reduce torque, general Omm above by the pneumatic valve are set by the by-pass within or outside the vent valve.