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Electromagnetic stainless steel safety and reliability

First, security: disaster will occur if you do not pay attention to safety
1, corrosive media: plastic electromagnetic stainless steel and stainless steel should be selected; for the strong corrosion of the media must be selected diaphragm type. Example CD-F.Z3CF. Neutral medium, it is also recommended to use copper alloy for the valve shell material of electromagnetic stainless steel, otherwise, the valve shell often rust off, especially infrequent occasions. Ammonia valves cannot use copper. Electromagnetic stainless steel reliability 2, explosive environment: must use the appropriate explosion-proof grade products, open installation or dust more occasions should use waterproof, dustproof varieties. 3, electromagnetic stainless steel nominal pressure should exceed the maximum working pressure within the tube.
Second, applicability: does not apply to spend money to buy things, but also add trouble
1, medium characteristics
1.1 Quality gas, liquid state or mixed state Electromagnetic stainless steels of different types are used, for example, ZQDF for air, ZQDF-Y for liquid, and ZQDF-2 (or -3) for steam, otherwise it may cause malfunction. ZDF series multi-function electromagnetic stainless steel can be connected to gas and liquid. It is best to state the media status at the time of subscription, and it is not necessary to install the user. 1.2 medium temperature products of different specifications, otherwise the coil will burn off, aging of the seals, seriously affecting life. 1.3 Medium viscosity, usually below 50 cSt. If it exceeds this value, the diameter is larger than 15mm and ZDF series multi-function electromagnetic stainless steel is used for special orders. Path is less than 15mm high viscosity stainless steel. 1.4 When the cleanliness of the medium is not high, the backwash filter valve should be equipped in front of the electromagnetic stainless steel. In the case of low pressure, straight-acting diaphragm type electromagnetic stainless steel can be used as a CD-P. 1.5 If the medium is directional and does not allow backward flow, ZDF-N and ZQDF-N are required to use two-way flow, please make special requirements. 1.6 The medium temperature should be selected within the allowable range of electromagnetic stainless steel.
2, pipeline parameters
2.1 Select the valve port and model according to the medium flow requirements and the pipe connection method. For example, for a switch from one pipe to two pipes, select CA5 and Z3F for small paths, and select ZDF-Z1/2 for medium or large paths. Another example is to control the convergence of two pipes, please choose ZDF-Z2/1 and so on. Electromagnetic stainless steel reliability 2.2 According to the flow and valve Kv value selected nominal diameter, can also choose the same pipe diameter. Please note that some manufacturers are not marked with Kv value, often the size of the valve hole is smaller than the interface diameter, must not be coveted and the price is low. 2.3 Working pressure difference <br> Minimum working pressure difference is above 0.04Mpa can choose indirect pilot type; Minimum operating pressure difference is close to or less than zero must use direct action type or step-by-step direct type.
3. Environmental conditions 3.1 The maximum and minimum temperatures of the environment should be selected within the allowable range. If there is any excess error, special orders must be made. 3.2 In environments where the relative humidity is high and there is water and rain, etc., waterproof, electromagnetic stainless steel should be selected. 3.3 The environment often has vibrations, bumps and impacts and other occasions should be selected special varieties, such as marine electromagnetic stainless steel. 3.4 Use in corrosive or explosive environments should be based on safety requirements Erosion resistance 3.5 If the environmental space is limited, please use multi-functional electromagnetic stainless steel, because it eliminates the bypass and three manual valves and easy online maintenance . 4. Power Conditions 4.1 According to the type of power supply, AC and DC electromagnetic stainless steels are selected respectively. In general, AC power is easy to use. 4.2 Use AC220V.DC24V as much as possible for voltage specification. 4.3 Power Supply Voltage Fluctuation Usually, the AC is selected between +% 10% and -15%, and the DC is allowed to be ± 10% or so. If there is an excess error, it is necessary to adopt a voltage regulator or make special order requirements. 4.4 The rated current and power consumption should be selected according to the power supply capacity. It should be noted that the value of VA at the time of AC start is high, and indirect conduction electromagnetic stainless steel should be preferred when capacity is insufficient. 5, control accuracy 5.1 ordinary electromagnetic stainless steel only open and close two positions, in the control of high precision and the parameters required to be stable when the use of multiple electromagnetic stainless steel; Z3CF three normally open electromagnetic stainless steel, with micro-open, fully open and close three The flow rate; ZDF-Z1/1 combination of multi-functional electromagnetic stainless steel with full open, wide open, small open, fully open four kinds of flow. Electromagnetic stainless steel reliability 5.2 action time: refers to the electrical signal is turned on or off to the completion of the main valve action time, only the company's patented product electromagnetic stainless steel can be adjusted on the opening and closing time, not only to meet the control accuracy requirements, but also to prevent Water hammer damage. 5.3 Leakage: The leakage value given on the sample is a common economic grade. If it is too high, please make a special order. Third, reliability: not reliable will damage the entire system! 1. Working life: This item is not included in the factory test project and it belongs to the type test project. In order to ensure the quality should be selected from the regular manufacturers of brand-name products. 2, the work system: a long-term work system, repeated short-term work and short-term work of three. The company's conventional products are long-term work systems, that is, coils allow long-term power work. For a long time when the valve opens only for a short time, normally open electromagnetic stainless steel should be used. When used in a short-term work system and when the volume is large, special orders can be made to reduce power consumption. 3. Working frequency: When the operating frequency is high, the structure should be preferably direct-acting electromagnetic stainless steel, and the power supply should be heard and exchanged. 4. Operational Reliability: Strictly speaking, this test has not been formally included in China's electromagnetic stainless steel professional standards. In order to ensure quality, it is necessary to select the brand-name products of regular manufacturers. In some cases, the number of operations is not large, but the reliability requirements are very high, such as fire protection, emergency protection, etc., must not be taken lightly. Of particular importance, it should also take two consecutive double insurance. Fourth, economy: The economy is one of the dimensions of the selection of funds, energy, and even life wasted, but it must be on the basis of safety, application, and reliability. Economicality is not only the selling price of a product, but also priority is given to its function and quality, as well as the cost of installation, maintenance and other accessories. More importantly, the cost of an electromagnetic stainless steel in the entire automatic control system in the entire automatic control system and even the production line is negligible. If a small amount of money is spent and wrongly selected, the damage group is huge. In short, economics not only refers to the price of a product, but the ratio of the price of a product to the price of a comprehensive product.

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