How to choose and erosion resistant pneumatic valve

erosion is one of the harsh conditions, has always been a difficult problem in field application. For erosion serious occasions, pneumatic valve's life is very short, short for ~, ~ in long time. In chemical catalysis hydrogenation unit of petrochemical industry and mines copper slurry conditioning applications, such as erosion problem is more outstanding, and at this stage have not developed resistance to erosion of pneumatic valve in particular, focus on the problem solving from the pneumatic valve body structure, selection of resistance to erosion and erosion prevention measures and so on several aspects to consider, targeted to solve.
one, the main reason for the erosion produce
erosion mainly appear in the large pressure difference, including particle medium occasion. On these occasions the pneumatic valve throttle mouth medium velocity is very high, the kinetic energy of the great, can quickly to pneumatic valve, pneumatic valve seat surface, through streamlined grooves, so that the sealing face was damaged, causing pneumatic valve malfunction or scrapped. Especially when working in a small open of the pneumatic valve, throttle gap smaller, fluid is faster, more erosion damage, pneumatic valve, shorter service life. Therefore, should try to avoid small open of the erosion resistance of pneumatic valve.
2, selection of pneumatic valve body structure
all medium flow throttling face obstacles will be relentless erosion of medium. Collision avoidance is the easiest and most effective way. Therefore, from the consideration on the pneumatic valve body structure should choose pneumatic valve flow direction changes as small as possible, straight travel Angle adjustment pneumatic valve is to provide the traditional solution of the flow path. Some rotary pneumatic valve, such as 'V pneumatic ball valve, pneumatic valve or eccentric rotating has a' V 'shape the structure of the throttle fully functional ultra light regulating pneumatic valve, such as the provision of almost straight flow channel, in terms of preventing erosion effect is very good. At the same time, the throttling mouth should be focused, roundness, Prevent particle medium with pneumatic trims contact number and reduce turbulence effect, slow down the throttle fluid velocity, reduce medium throttling surface erosion.
3, erosion resistance materials choose
the worst over medium impact damage of pneumatic valve, pneumatic valve seat sealing surface, should choose as far as possible on the basis of guarantee the toughness of hard material, such as wear-resistant alloy surfacing, pneumatic valve in order to improve the ability of resistance to erosion damage. If especially serious erosion, guide surface and the erosion of the pneumatic valve body surface should also surfacing welding alloy, in order to improve the reliability and service life of the
4, selection of erosion prevention measures
( Collision avoidance is a simple and effective method. Straight travel pneumatic valve flow is complex, the turning from erosion; Pneumatic valve core is stopped in the middle of the throttle, erosion directly by the medium directly, more can't avoid. So, straight travel class unfavorable choose pneumatic valve. Quarter-turn pneumatic valve is better to solve this problem, but the pneumatic valve plate in the central erosion, avoid the effect of the best is a fully functional ultralight pneumatic valve, pneumatic valve, eccentric rotating 'V' type pneumatic ball valve.
( Work as much as possible to avoid the small open degree, should as far as possible on the guarantee of the opening of the pneumatic valve work in ~ %. Such as medium contains a large amount of solid particles, more should be increased to the normal opening ~ %, in order to reduce particulate medium impact to seal number, slow velocity, reduce erosion damage, improve the service life of the pneumatic valve.
( Choose wear-resisting material.
( With takong degree of large thrust ( The torque of the actuator.
( Erosion usually has not clean medium serious situations, often accompanies jams, therefore, should pay attention to at the same time on the selection of combat the problem.
5, erosion resistant pneumatic valve pneumatic valve type selection
( A fully functional ultra light regulating pneumatic valve
( Eccentric rotary pneumatic valve.
( 'V' shape pneumatic ball valve
( Angle of pneumatic valve