According to reasonably choose pneumatic valve 2 medium characteristics

only need to change the direction of a fluid, commonly used by the pneumatic valve has the following kinds: cut-off Angle type pneumatic valve; The Angle type by the pneumatic valve. That through this pneumatic valve pressure drop is smaller than conventional structure of the pneumatic valve. Once-through as pneumatic valve; Once-through or Y stop pneumatic valve, pneumatic valve flow channel and the mainstream way into a diagonal lines, so that the destruction of the flow state level than the practice by the pneumatic valve is smaller, so the pneumatic valve through the pressure loss and the corresponding small pneumatic valve plunger deadline: this form by the pneumatic valve is practices as variant of pneumatic valve. The pneumatic valve, pneumatic valve and pneumatic seat is usually designed on the basis of the principle of plunger pneumatic polishing disc pillars plug connected to pneumatic valve stem, seal is set in the column inserting two elastic sealing ring true two elastic sealing ring with a set of rings is separated, and through the air valve cover nut to the load of the pneumatic valve cover pressed around the plunger seal. Elastic sealing ring can be replaced, can use all sorts of data, which is mainly used to open or close the pneumatic valve, but equipped with a special form of plunger or special thimble, can also be used to adjust flow.
how to press medium characteristics reasonably choose pneumatic valve?
one, according to the medium choose pneumatic valve on-off nature:
brake pneumatic valve:
the entire circulation straight when fully open, brake pneumatic valve is used as as medium. The pressure loss of the medium run. Brake pneumatic valve is usually applied to don't need to often open/close, and stick to the operation condition of the full open or full close gate. Is not suitable for use as regulating or throttling. For the high-speed flow medium, ram in local open conditions can cause the vibration of the gate, and vibration may damage the gate and pneumatic valve seat sealing surface, and the throttling can make gate medium of erosion. From the structure form, the main difference is adopted in the form of packing element. According to the form of sealing element, often the brake pneumatic valve is divided into several different types, such as: parallel brake pneumatic wedge gate valve, pneumatic valve, pneumatic valve parallel double disc brake, wedge double disc brake, etc. The most common form is pneumatic wedge gate valve and parallel brake pneumatic valve.
butterfly pneumatic valve:
disc disc around the axis of rotation, the adjustment of the pneumatic valve butterfly plate device in the diameter of the pipe direction. Pneumatic valve pneumatic butterfly valve body cylindrical channels. Rotation Angle between ~, rotation, pneumatic valve is fully open.
only by a few parts. Only and rotation can be rapid opening and closing, adjustment of pneumatic valve has simple structure, small volume, light weight. The operation is simple, at the same time, the pneumatic valve has good flow control characteristics. Butterfly pneumatic valve in the fully open position, the butterfly plate thickness is medium flows through the only pneumatic valve body resistance, and so by the pneumatic valve pressure drop is small, it has good flow control characteristics. Butterfly pneumatic valve seal and metal sealing machine has two sealing type. Elastic sealing pneumatic valve, sealing ring to be set on the pneumatic valve body or attached to the butterfly plate peripheral.
but it is hard to be completely sealed. Metal sealing can adapt high working temperature, using metal seal pneumatic valves generally live longer than elastic sealing pneumatic valves. Resilient seal has the defect of being limited by the temperature.
as pneumatic valve:
and have a very reliable cutting action, by the pneumatic valve pneumatic valve stem axis and the vertical pneumatic valve seat sealing surface. Pneumatic valve stem to open or close the trip is relatively short. Make the pneumatic valve is very suitable for used as medium cut or adjust and throttling.
pneumatic seat and disc are no longer contact between the sealing surface, by the pneumatic valve pneumatic disc once in an open condition. And have a very reliable cutting action, close to the pneumatic valve is very suitable for used as medium cut or adjust and throttling.
pneumatic seat and clapper sealing surfaces, there is no longer contact between once by the pneumatic valve is fully open. Thus its sealing surface mechanical wear and tear is small, as most as pneumatic valve pneumatic seat and disc is easier to repair or replace the whole pneumatic sealing components without removed from the pipeline, valve for pneumatic valves and pipeline welding into one place is very applicable medium through the pneumatic valve flow direction has changed, so stop pneumatic valve flow resistance is higher than other pneumatic valves.