Cryogenic liquid pump discharge pneumatic valve technology is introduced

reciprocating cryogenic liquid pump is cryogenic liquid ( Such as liquid oxygen, liquid nitrogen, liquid argon pressure filling bottle or pipeline to use oxygen cryogenic equipment, with its simple structure, stable and reliable, safe and economic operation and the low speed characteristics by the users of all ages. Reciprocating pump suction pneumatic valve and the discharge of the pneumatic valve is its core, thus get rid of the service life of pneumatic valve is one of the important factors that have influence on reciprocating pump performance.
: (the basic requirement of pneumatic valve In closing has good sealing, no liquid leakage. ( Pneumatic valve opening and closing action, wants to be coordinated with the movement of the piston is consistent, otherwise due to the hysteresis of pneumatic valve cause the leakage of cryogenic liquid, reduce the volumetric efficiency of the pump. ( Pneumatic valve work smoothly, especially the pneumatic valve is closed, no serious impact phenomenon, oriented to the flexible, can not have stuck phenomenon. ( Cryogenic liquid flows through the pneumatic valve, the resistance loss is smaller. ( Simple structure, better processing manufaturability, maintenance is convenient. ( Should have sufficient strength and rigidity, better wear resistance, long service life.
the movement rule of pneumatic valves
pneumatic valve plate up and down according to the force balance and the 'hard equations of fluid mechanics and fluid flows through the pneumatic valve clearance ( Holes flow formula, it can be concluded that the pneumatic valve lift the hv, velocity and acceleration of a corner Φ relationships. Visible, in the corner Φ equal to PI/scope, the speed of the pneumatic valve is positive, and negative acceleration. Pneumatic valve rises, is a kind of slow motion. Within the scope of the equal to Φ PI/PI, pneumatic disc drops, the speed of the pneumatic valve is negative, and the acceleration is negative, that pneumatic disc is a kind of growth falling movement, which would strengthen the impact of the pneumatic valve seat. Because of the steady movement of pneumatic valve is at work, there is a vest, phenomenon, at the beginning of the exhaust stroke, pneumatic valve does not rise, after a lag Angle, hydraulic pneumatic valve to action, a piston lag, the moment of the end of the exhaust stroke, pneumatic valve has not been closed, stop the lift for the height of the hmax, after a lag Angle, pneumatic valve to close.
pneumatic valve type and structure of the pneumatic valve from
the type many, such as flat pneumatic valve, pneumatic valve, pneumatic valve, the spherical cone annular pneumatic valve, etc. , but the opening and closing force, relied on pneumatic valve fluid pressure difference before and after. Now is a comparison between two typical structure forms.