Four performances of the hottest solenoid valve

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Four performances of solenoid valve

I Security:

1 Corrosive medium: Plastic King solenoid valve and all stainless steel should be selected; For strongly corrosive media, the isolating diaphragm type must be selected. Example cd-f. z3cf. For neutral medium, the solenoid valve with copper alloy as the valve shell material should also be selected. Otherwise, rust chips often fall off in the valve shell, especially in the case of infrequent action. Ammonia valves shall not be made of copper

2. Explosive environment: products of corresponding explosion-proof grade must be selected. Waterproof and dustproof varieties shall be selected for outdoor installation or dust-proof occasions

3. The nominal pressure of the solenoid valve shall exceed the maximum working pressure in the pipe

II Applicability:

1 Medium characteristics

1.1 different types of solenoid valves are selected for gas, liquid or mixed state. For example, ZQDF is used for air, zqdf-y is used for liquid, and zqdf-2 (or -3) is used for steam, otherwise it is easy to cause malfunction. ZDF series multi-function solenoid valve can be connected to air Liquid. It is best to specify the media status when setting, so that the installation user does not have to adjust it

1.2 if the medium temperature is different from that of products of different specifications, otherwise the coil will burn out and the seal will be aged, which will seriously affect the service life

1.3 medium viscosity, usually below 50cst. If the diameter exceeds 15mm, ZDF series multi-function solenoid valve shall be used for special order. High viscosity solenoid valve with diameter less than 15mm

1.4 when the medium cleanliness is not high, the backwash filter valve should be installed in front of the solenoid valve. When the pressure is low, the direct acting diaphragm solenoid valve can be used as an example cd-p

1.5 if the medium is in directional flow, and it is not allowed to reverse flow, zdf-n and zqdf-n only need two-way flow, please put forward special requirements

1.6 the medium temperature shall be within the allowable range of solenoid valve, especially in the valve industry

2. Pipeline parameters

2.1 select the valve port and model according to the requirements of medium flow direction and pipeline connection mode. For example, for switching from one pipe to two pipes, select Ca5 and Z3F for small diameter and zdf-z1/2 for medium or large diameter. For another example, to control the confluence of two pipelines, please select zdf-z2/1, etc

it can maximize the problem of low recycling value and unworthy recycling caused by the use of primary plastics.

2.2 the nominal diameter is selected according to the flow and Kv value of the valve, which can also be the same as the pipe inner diameter. Please note that some manufacturers are not marked with Kv value, and the valve hole size is often smaller than the interface pipe diameter, so we must not delay things due to low prices

2.3 if the minimum working pressure difference is above 0 and 04mpa, the indirect pilot type can be selected; If the minimum working pressure difference is close to or less than zero, the direct acting type or step-by-step direct type must be selected

3. Environmental conditions

3.1 the maximum and minimum temperature of the environment shall be within the allowable range. If there is any out of tolerance, it shall be put forward by special order

3.2 waterproof solenoid valve shall be selected for occasions with high relative humidity in the environment and water drops and rain.

3.3 special varieties shall be selected for occasions with frequent vibration, turbulence and impact in the environment, such as marine solenoid valve

3.4 for use in corrosive or explosive environment, hair corrosion resistance shall be preferred according to safety requirements.

3.5 if the environmental space is limited, please select multi-functional solenoid valve, because it omits bypass and three manual valves and is convenient for maintenance

4. Power supply conditions

4.1 according to the type of power supply, AC and DC solenoid valves are selected respectively. Generally speaking, the AC power supply is easy to access

4.2 AC220V and DC24V shall be preferred for voltage specification

4.3 power supply voltage fluctuation usually adopts +%10%, -15% for AC and ±%10 for DC. In case of out of tolerance, voltage stabilization measures must be taken or special order requirements must be put forward

4.4 the rated current and consumed power shall be selected according to the capacity with poor power performance. It should be noted that the VA value is high during AC starting, and the indirect pilot solenoid valve should be preferred when the capacity is insufficient

5. Control accuracy

5.1 ordinary solenoid valves only have two positions: on and off. When the control accuracy is high and the parameters are stable, please select multi position solenoid valves; Z3cf three position normally open solenoid valve has three flows: Micro open, full open and close; The zdf-z1/1 combined multi-function solenoid valve has four flows: full open, large open, small open and full open

5.2 action time: refers to the time from the electric signal on or off to the completion of the main valve action. Only the patented multi-functional solenoid valve of the company can adjust the opening and closing time respectively, which can not only meet the requirements of control accuracy, but also prevent the damage of water hammer

5.3 the leakage value given on the leakage sample is the common economic grade. If it is too high, please make a special order

III. reliability:

1. Service life. This item is not included in the factory test item, but belongs to the type test item. In order to ensure the quality, the famous brand products of regular manufacturers shall be selected

2. Working system: divided into long-term working system, repeated short-term working system and short-term working system. The conventional products of the company are of long-term working system, that is, the coil is allowed to work with power on for a long time. If the valve is opened for a long time and only closed for a short time, the normally open solenoid valve should be selected. It can be used in short-time working system with large batch, and can be ordered specially to reduce power consumption

3. Working frequency: when the action frequency is high, the structure should be direct acting solenoid valve, and the power supply should be AC

4. Strictly speaking, this test has not been officially listed in the professional standard of solenoid valve in China. In order to ensure the quality, the famous brand products of regular manufacturers should be selected. In some cases, the number of actions is not large, but the reliability requirements are very high, such as fire protection, emergency protection, etc. we must not take it lightly. Especially important, it is also necessary to adopt two consecutive double insurances

IV. Economy:

diseconomy is a waste of money, energy and even life. It is one of the measures it uses. However, it must be economical on the basis of safety, applicability and reliability. Economy is not only the price of the product, but also the function and quality, as well as the cost of installation, maintenance and other accessories. More importantly, The cost of one solenoid valve in the whole automatic control system and even in the production line is very small. If the solenoid valve is selected incorrectly for the sake of small price, the damage group will be huge

in a word, economy refers not only to the product price, but also to the performance price ratio and comprehensive cost price ratio of the product

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