30t/h Japan VRH molding production line sand delivery system, sand (magnesium olivine) sent to the off-site sand reservoir by high-pressure pressure transmission, the use of throttle valve to distribute the role of sand reservoir, as shown in Figure 1.
Sleeve valve sleeve liner for the rubber, with compressed air extrusion, making rubber deformation play a sealing role, due to the instability of domestic rubber quality, sometimes less than half a class, good can only maintain a month This not only increases maintenance costs and maintenance workload, but also often causes production interruptions. Therefore, there is a need to find a reliable device to replace the rubber sleeve throttle valve.
1. Renovation plan
1. Renovation plan
(1) Renovation using common carbon steel ball valves
The Japanese carbon steel ball valve was used to replace and reform the a valve, and the quality was relatively stable. However, due to high-speed erosion of the sand particles, the internal wear of the ball valve was very serious, as shown in Fig. 2.
(2) Renovation with Ceramic Ball Valves
At the same time, KOWOV full-lined hard-sealing ceramic ball valve was used to replace the b valve. Due to its high corrosion resistance and high wear resistance, it was only slightly worn after the transformation was completed for more than one year, as shown in Figure 3.
2, transformation effect
(1) Reliability
According to the current wear and tear, the service life of the KOWOV ceramic ball valve is at least 5 years.
(2) Economical
Rubber sleeve throttle valve unit price 1600 yuan / month, according to each month maximum life expectancy, need to consume 12 each year, then 1600 × 12 = 19200 yuan, 5 years consumption 19200 × 5 = 96000 yuan, according to the use of the situation in recent years See, the average consumption of more than 20, 5-year fee is 9.6 to 16 million yuan, while the purchase of a ceramic ball valve only need more than 60,000 yuan, greatly reducing the cost of spare parts. At the same time, the losses caused by interruptions in production cannot be calculated. Table 1 shows the comparison before and after the improvement.
Table 1 Comparison before and after transformation
name
Rubber sleeve throttle valve
Japan Carbon Steel Ball Valve
KOWOV Fully Lined Hard Seal Ceramic Ball Valve
Average life expectancy
Up to 1 month
1 year
5 years
Change work hours
4 people 6h
4 people 2h
4 people 2h
Unit price/yuan
1600
20000
65000
maintain
Need to install spare parts in advance
Maintenance-free
Maintenance-free
3, the conclusion
Over the past year or more since the transformation, the entire system has been able to work stably, without any breakdown, and has effectively protected production. Practice has proved that the use of KOWOV ceramic ball valve instead of the original rubber sleeve throttle valve program is feasible, especially the use of ceramic ball valve is more obvious and stable, easy to transform, small amount of engineering, is a feasible method of molding sand line system sand pump system transformation.