The necessary consideration of choose and buy exhaust pneumatic valve products

exhaust pneumatic valve type selection in the engineering design, should be selected according to specific site conditions of various types of pneumatic valve, exhaust of local high composite exhaust pneumatic valve installation; For long horizontal section, long distances without fold point drop the appropriate section to install complex trace exhaust vent pneumatic valve or pneumatic valve; For falling gradient becomes bigger, rising slope small point appropriate chooses trace exhaust pneumatic valve; When need to vacuum protection, should choose a combined exhaust pneumatic valve; For long distances without fold point rise can choose composite exhaust pipe pneumatic valve.

trace exhaust vent pneumatic valve diameter choose pneumatic valve due to the applicable scope is small, can use directly, general pipe diameter for the DN, DN. Due to the complex trace exhaust vent pneumatic valve is the high speed pneumatic valve and exhaust suction pneumatic valve combination, the composite exhaust pneumatic valve and high-speed exhaust/suction pneumatic valve diameter selection criteria are the same as

choose according to performance curve due to high-speed exhaust/suction pneumatic valve is used to eliminate air water filling and emptying inspiratory, therefore should be considered in the volume of air pipe when the water filled out Displacement and drainage vent pipe or tube to protect the amount of air inhaled ( Inspiratory capacity, not only to calculate the water filling the outlet diameter, and calculating the emptying of inspiratory mouth diameter, choice of the big caliber as the exhaust/suction pneumatic valve diameter.

exhaust pneumatic valve selection problems should be paid attention to in the course of

. The position of the vent pneumatic valve choice is more important than the diameter of choice.
　　
　　. For long distance pipe thread, the ideal method of exhaust is in a relatively short distance ( Generally for ~ m installation number, diameter smaller vent pneumatic valve, rather than installing larger diameter but less number, interval long exhaust pneumatic valve.
　　
　　. In most cases, required to install small capacity automatic exhaust, high-capacity system water exhaust and emptying of three function groups of pneumatic valve, vacuum breaker or compound exhaust pneumatic valve.
　　
　　. When the pipe on both sides have different slope, according to the strict slope exhaust pneumatic valve size is determined.
　　
　　. If choose not to bring a slowly-closing exhaust pneumatic valve, had better be in a two row of one large and one small corner of the pneumatic valve. If choose slowly-closing with exhaust pneumatic valve, only one can be at the top of the tube. Many ups and downs of pipes, exhaust pneumatic valve should be installed at the high place.

factors must be taken into consideration to choose the appropriate exhaust pneumatic valve

. Displacement displacement is small, often after the water for a long time to recover the original water supply ability; Exhaust polyu is back to normal water supply capacity in a very short time.
　　
　　. Closing pressure air vent pneumatic valve exhaust capacity limit. Exhaust pneumatic valve exhaust capacity is related not only with the calibre of the pneumatic valve, are also associated with pneumatic valve gas pressure difference inside and outside.

in normal circumstances, the pneumatic valve opening and closing the restraint of float up and down displacement, displacement of the floating ball is controlled by pneumatic valve cavity liquid level. When a large number of gas emissions focuses rapidly, floating ball or pneumatic valve plate is impacted by the gas thrust and closed, and affect the exhaust. Appeared the phenomenon of the air pressure is called the air pneumatic valve closed.

when the pneumatic valve plate in float resisted pneumatic valve hole, pushed by the air current instantaneous interruption, pneumatic valve plate will fall again, airflow and can form, pneumatic valve plate closed again, closed system oscillation phenomenon. In order to avoid the negative effects of due to the air closed pressure, equipped with exhaust pneumatic valve pneumatic valve size, should choose the appropriate assurance in pneumatic valve installation position of the maximum displacement of the exhaust pressure should be lower than the air closed pressure value. The above to select the appropriate exhaust pneumatic valve is the most important thing.

because shut down if the air pressure too low, often along did not start emissions, air exhaust pneumatic valve inside the float ball have been air float, close the vent. General good exhaust pneumatic valve closed pressure can reach its air. MPa, have enough ability to tube air emissions over quickly, so the air pressure in the pneumatic valve body is greater than the commonly. MPa, the air speed has reached the maximum velocity of flow ( m/s。
　　
　　. Water closed pressure range of exhaust pneumatic valve device in pipeline, because of this point pipe water pressure is very low, sometimes part of the exhaust need water pressure is higher than the pneumatic valve. MPa to completely shut down, if below this pressure will produce leakage phenomenon, so water closed pressure range is bigger, the better, usually. ~。 MPa is the most commonly used.
　　
　　. Exhaust choosing vent pneumatic valve, pneumatic valve parameters must provide manufacturer pipe diameter, maximum working pressure, maximum flow and other parameters. According to these parameters, determine the diameter of the vent pneumatic valve, vent aperture, to ensure that under normal circumstances, the clean water contains about % in the continuous release of the dissolved air can be ruled out.