The importance of water hydraulic pump with flow pneumatic valve

in the pneumatic valve and water hydraulic pump, valve, pneumatic valve and cylinder piston together form the seal cavity, and with the movement of the plunger, in turn, will pump water inlet, outlet and plunger cavity connected or disconnect, so as to realize the distribution of the pump flow. Of the overall performance of the pump flow pneumatic valve, such as working pressure, volume efficiency and ability to resist pollution, noise, operation reliability and service life and so on all has very big effect.
with general principles of flow pneumatic valve
the physical and chemical properties of water medium to flow pneumatic valve put forward the more strict requirements, such as pneumatic, pneumatic valve core seat to have a good ability to resist corrosion, cavitation and erosion; Pneumatic valve port to have a better sealing performance; Pneumatic valve mouth impact fatigue resistance is better. At the same time, the characteristics of water medium to flow pneumatic valve also be beneficial, such as:
due to the low viscosity of water, pneumatic valve core movement by the viscous resistance of small, is beneficial to reduce the inertia lag of pneumatic valve core.
the volume of water about twice of the oil elastic modulus, the compressibility of smaller, thus caused by closed die volume lag is smaller.
water hydraulic pump with flow pneumatic valve structure should be able to meet the following requirements:
(1) with a flow pneumatic valve of lifting action should work in harmony with the movement of the plunger to coordinate, fast response speed, flow pneumatic valve lag should be as small as possible, to prevent the valve pneumatic valve leakage and the volumetric efficiency decline.
(2) with flow pneumatic valve should work smoothly, no vibration, closing should be no serious impact phenomenon, in order to prevent the vibration, noise and cause the destruction of the sealing surface.
(3) with flow pneumatic valve pneumatic valve opening of pressure loss should be as small as possible, the suction pneumatic valve to avoid caused by inhaling resistance is insufficient suction gas hole phenomenon. Press the pneumatic valve to avoid resistance is too large and cause the plunger cavity pressure and much higher than the system pressure, increase the power loss of the pump.
(4) with flow pneumatic valve sealing performance should be good.
5. Valve pneumatic valve pneumatic valve cavity of closed die volume ( The clearance volume to be as small as possible.
6. Service life is long, want to choose the pneumatic valve core and pneumatic seat of the material and heat treatment process.
7) simple structure, good processing and manufacturing and assembly technology, the cost is low.
all in all, request flow pneumatic valve has simple structure, reliable operation, low cost, long service life, can guarantee the water hydraulic pump work efficiently.