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Solenoid valve selection should follow the principle of installation attention points

2019-04-16
Four principles of type selection
12
Security:

1, corrosive media: should choose plastic king Solenoid Valve and all stainless steel; For highly corrosive medium must be selected isolation diaphragm type. Neutral medium, also should choose copper alloy for valve shell material solenoid valve, otherwise, valve shell often rust chip off, especially not frequent occasions. Ammonia valve can not use copper.


2, explosive environment: must choose the corresponding explosion-proof grade products, outdoor installation or dust occasions should choose waterproof, dust varieties.


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

Applicability:


1. Medium characteristics


1) different kinds of solenoid valves are selected for quality gas, liquid or mixed state;

2) different specifications of medium temperature products, otherwise the coil will burn off, seal aging, serious impact on life;

3) medium viscosity, usually below 50cSt. If this value is exceeded and the diameter is greater than 15mm, use the multi-function solenoid valve; Use high viscosity solenoid valve for sizes less than 15mm.

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 diaphragm type solenoid valve can be selected;

5) if the medium is directional flow, and does not allow reverse flow, two-way flow should be used;

6) medium temperature should be selected within the allowable range of the solenoid valve.

2. Pipeline parameters

1) select valve outlet and model according to the requirement of medium flow direction and pipeline connection mode;

2) according to the flow rate and valve Kv value, select the nominal size, or the same as the pipe diameter;

3) working pressure difference: when the minimum working pressure difference is above 0.04mpa, indirect pilot type can be selected; If the minimum working pressure difference is close to or less than zero, the direct type or step by step direct type must be selected.

3. Environmental conditions

1) the maximum and minimum ambient temperatures shall be selected within the allowable range;

2) Waterproof Solenoid Valve should be selected for occasions with high relative humidity in the environment and raindrops;

3) special products, such as Marine solenoid valves, should be selected in the environment where vibration, turbulence and impact are common;

4) when used in corrosive or explosive environment, corrosion resistant type shall be preferred according to safety requirements;

5) if the environment space is limited, multi-function solenoid valve should be selected, because it saves bypass and three-handed valve and is convenient for online maintenance.

4. Power condition

1) ac and dc solenoid valves are selected according to the type of power supply. Generally speaking, ac power supply is easy to access.

2) as far as possible, AC220V and DC24V are preferred for voltage specifications;

3) the power supply voltage fluctuation is usually selected as % 10%-15% ac, and the dc is allowed to be %10 or so.

4) rated current and consumed power shall be selected according to the power supply capacity. Attention should be paid to the high VA value during ac starting, and the indirect guided solenoid valve should be preferred when the capacity is insufficient.

5. Control accuracy

1) the general solenoid valve has only two positions, open and close, in the control of high precision requirements and smooth parameters need to choose a number of solenoid valve;

2) operation time: refers to the time when the electrical signal is connected or cut off to the completion of the main valve operation;

3) leakage amount: the leakage amount given on the sample is the commonly used economic grade.

Reliability:

1. Service life: this item is not included in the factory test item, and is a type test item. In order to ensure quality should choose regular manufacturers of famous products.

2. Working system: long-term working system, repeated short-term working system and short-term working system. For a long time to open the valve only a short time to close the situation, it is appropriate to choose a normally open solenoid valve.

3, working frequency: when the operation frequency is high, the structure should be preferred direct moving solenoid valve, power supply to listen to the preferred ac.

4. Action reliability

Strictly speaking, this test has not been formally included in the professional standards of China's solenoid valve, in order to ensure quality should choose the regular manufacturers of famous brand products. Some circumstance action frequency is not much, but very tall to reliability requirement however, wait like fire control, emergency protection, must not take lightly. Especially important, should also take two with double insurance.


Economical:


It chooses one of the dimensions, but must be on safe, applicable, reliable foundation economy.

Economy is not only the price of the product, but also the cost of its function and quality, installation, maintenance and other accessories.

More importantly, a solenoid valve in the entire automatic control system in the entire automatic control system and even in the production line of the cost is very small, if the greed for cheap wrong selection and cause damage group is huge.

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