Pneumatic valve throttle with slurry brake structure improvement

a overview,
because of the type selection calculation and the actual error exists in the resistance of pipelines and slurry pump in actual operation, the flow is larger. In order to achieve the balance of production, need to use brake on the road in the outlet pipe of pneumatic valve to regulate flow, to meet the requirements of production process. Brake pneumatic valve, normally only done by the use, open degree is less than %, can be up to the role of throttle, do throttling when used in slurry pipeline, life is short. Brake pneumatic valve throttle when cavitation and return, in the pneumatic valve body and disc parts to form a large number of deep groove and potholes, leading to premature failure brake pneumatic valve, increases the maintenance cost, seriously affect the stable operation of the production system.

2, analysis when the slurry through the gate with the passage of the small pneumatic valve body to form, the flow area of local contraction, velocity a sharp increase in pressure drop abruptly, instantaneous pressure drop after the evaporation pressure, can produce bubbles. After the throttle, increases the pressure of the compressed air bubbles, forced air bubble burst, the damage to materials. At the same time, the slurry through the local contraction of small cross section, and the pipe flow, produce low pressure area on the back of the disc, formation of backflow. Reflow slurry mixed with air bubbles and slurry, in the high and low pressure area washed repeatedly, the ram and pneumatic valve at the bottom of the tank on the back of serious damage to formation, especially the crescent-shaped gate on both sides and pneumatic valve body form Angle at the back gate is most serious. At the same time, also can produce noise and vibration. Three, improvement of

in order to improve the wear resistance of brake pneumatic valve, the inlaid bushing structure, can be rubber or wear resistant alloy liner material. Rubber material cost is low, sealed performance is good, but wearability is poor, short service life, easy maintenance, and replacement of inconvenient, work running cost is high. Wear-resistant alloy material wear-resisting performance is good, than the whole forging wear-resistant alloy cost is low, cost-effective than rubber, liner can be replaced, pneumatic valve body can continue to use for a long time. Bushing selects high hardness, abrasion resistance of high chromium wear-resistant alloy casting, the hardness after heat treatment of ~ HRC, good abrasion resistance.
in order to reduce the flow erosion of ram and pneumatic valve body slots, set in the export of clapboard. Diaphragm force medium to form secondary spread, will be a large area of flow control under the diaphragm area, reduce the backflow of ram and pneumatic valve body slots. Reduced the pressure drop at the same time, reduce the possibility of a cavitation occurs. Four, conclusion

brake bushing and clapboard structure is used in pneumatic valve can effectively allocate differential pressure, avoid cavitation. At the same time with high abrasion resistance of alloy materials do bushing, increases the slurry pipeline in pneumatic valve throttle with gate of life.

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