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What causes the damage of electromagnetic stainless steel sealing surface?

1. The material of electronic stainless steel
In the past, most of the material of the valve body, valve cover, and transmission case were gray cast iron and some were ductile iron. In view of the promotion of the use of nodular cast iron for pipes and pipe fittings, the material of solenoid valves should also be the same. In order to improve the quality of the castings and reduce the weight of electronic stainless steel, in particular, the valve plate should first use the ball-iron (QT405-10).
It should be pointed out that due to the different thickness of the electromagnetic stainless steel parts, the difficulty of ball casting is greater, and corresponding measures should be taken to ensure the quality of castings. It is recommended that all manufacturers establish a strict quality control system. For a large number of small and medium sized electronic stainless steel, the method of lost foam molding is adopted. The large-diameter electronic stainless steel adopts resin sand molding, and the casting shall have effective measures to eliminate internal stress and promote shot blast cleaning. Sand measures. The defects of the castings are not allowed to be eliminated by welding. Otherwise, measures should be taken to eliminate the internal stress caused by welding repairs, carry out more rigorous inspections, and explain the situation to users.
2. Electronic stainless steel gearbox
Large-diameter solenoid valve is equipped with a gearbox due to the relationship between opening and closing moments. For such components, it is desirable to note the following points in manufacturing:
(1) There is a device for opening and closing the limit on the box. The adjusting nut of this device should be set in the box.
(2) The cabinet structure is as small and solid as possible. If the opening and closing operations are excessive, the cabinet will not be broken.
(3) The transmission structure is reasonable in design. When the valve is opened and closed, it can only drive the valve shaft to rotate, and it does not make it move up and down. The transmission parts are engaged normally and do not produce separation and skidding when the load is opened and closed. The
(4) The gearbox is often easily immersed in water in areas with high groundwater levels, so the enclosure should be sealed. Some electronic stainless steel manufacturers have integrated the housing of the valve shaft packing with the gearbox. Once the water leaks at the packing, it is easy to put it into the box. This is an improvement.
3. Electronic stainless steel operating mechanism
The pipeline is often buried underground, the electromagnetic valve is well-protected, and the stainless steel is not suitable. The opening and closing of the electronic stainless steel is to work from the ground. Therefore, the opening and closing end of the electronic stainless steel should be equipped with a square brim, and the hand-wheel is not suitable. The direction of opening and closing always requires a clockwise rotation to close the valve, and the order should be clear. The opening and closing degree of the electronic stainless steel shall be marked with a marking plate. This marking plate shall be observed from the ground. The scale of the marking plate shall be cast on the casting and fluorescent powder may be applied for striking. Aluminum skin and other materials should not be used. The scale of the pointer and opening and closing limit should be adjusted before installation and locked.
4. Sealing packing of valve stem
Electromagnetic stainless steel drip often appears on the seal packing of the valve stem, especially the large-diameter electromagnetic valve stops the water due to the maintenance of the filler, and the cost is expensive. Therefore, it is very necessary to improve the durability of the seal packing. On the one hand, the materials used are suitable and not easy to be aged. On the other hand, the wear of the packing is required to be very small. In addition, the number of open and close stainless steels in the pipe network is limited, and it is better to avoid replacing them for decades.
5. Electronic stainless steel opening and closing torque
The electronic stainless steel manufacturer first optimized the design of the electronic stainless steel structure, improved the concentricity of the component assembly, the smoothness of the contact surface of the moving parts, and reduced the opening and closing resistance. If only relying on the transmission ratio of the transmission, increasing the opening and closing speed to reduce the opening and closing torque is not ideal. For this purpose, the updating of mechanical processing methods cannot be ignored. For example, in order to improve the quality of machining, computer-controlled machine tools and machining centers are equipped.
6. Electronic stainless steel performance and testing
When evaluating the performance and performance of electronic stainless steels, pay attention to the following points:
(1) The electronic stainless steel is flexible and portable under the working water pressure, and the torque is used to detect the opening torque under the working water pressure.
(2) The electronic stainless steel has a strong overcurrent capability. Especially for butterfly valves, the over-flow resistance of the butterfly plate should be small and the effective area for over-current should be large. This requires a variety of caliber, different types of solenoid valves should also be qualified in the detection unit, the determination of flow resistance coefficient.
(3) The ability of the valve body to hold the water pressure should be consistent with the pipeline, that is, under the condition that the electronic stainless steel is opened, the electronic stainless steel can withstand the pipeline test pressure requirements.
(4) Tests for the life, resistance, and torque of DN ≤ 600mm stainless steel can be performed.
(5) The electronic stainless steel is closed tightly. Under 1 1 times working pressure, no leakage or dripping meets the standard requirements (metal-sealed butterfly valve). This requires the electronic stainless steel to bear the pressure on both sides, detect separately, and repeatedly Close to the same effect. Requires a variety of caliber, different types of solenoid valves, should be in the manufacturer and qualified testing units, with load open and close life testing. This test also includes evaluation of the valve shaft seal effect.

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