The selection of explosion-proof solenoid valve, why choose explosion-proof solenoid valve

First, safety of explosion-proof solenoid valve

1, corrosive media: plastic king solenoid valve and stainless steel should be selected; For strong corrosive media, isolation diaphragm type must be selected. For neutral media, it is also appropriate to choose copper alloy as the valve shell material of the solenoid valve, otherwise, the valve shell often rust off, especially in the case of infrequent action. Ammonia valves cannot use copper.

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

3, the nominal pressure of the solenoid valve should exceed the maximum working pressure in the pipeline.

Two, the reliability of explosion-proof solenoid valve

1. Working life, this does not belong to the factory test project, belongs to the type test project. In order to ensure quality, famous brand products from regular manufacturers should be selected.

2, work system: divided into long-term work system, repeat short-time work system and short-time work system three. The company's conventional products are long-term working system, coil allows long-term power work. For a long time to open the valve and a short time to close the situation, it is appropriate to choose normally open solenoid valve. For short time working system, large batch, can be special order, reduce power consumption.

3, working frequency: when the working frequency requirements are high, the structure should be direct acting solenoid valve, power supply should be AC.

4. Operation reliability

Strictly speaking, this test is not officially included in the professional standard of solenoid valve. In order to ensure quality, we should choose regular manufacturers of famous brand products. In some occasions, the number of movements is not much, but the reliability requirements are very high, such as fire protection, emergency protection, must not be taken lightly. It is especially important to take two consecutive double insurance.

Three, explosion-proof solenoid valve economy

Is one of the criteria it chooses, but must be economical on the basis of safety, applicability and reliability.

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

More importantly, the cost of a solenoid valve in the whole automatic control system is very small in the whole automatic control system and even in the production line. If covet small profits, early to choose the wrong, the harm group will be very big.

Explosion-proof solenoid valve selection basis

1, according to the pressure parameter selection of solenoid valve: principle and structure type

1) Nominal pressure: This parameter has the same meaning as other general valves and is determined according to the nominal pressure of the pipeline;

2) Working pressure: if the working pressure is low, direct action or step by step principle must be used; When the minimum working pressure difference is above 0.04Mpa, direct acting type, step direct acting type and pilot type can be selected.

2. Electrical selection: AC220V and DC24 are preferred for voltage specifications as far as possible.

3, according to the length of continuous working time to choose: normally closed, normally open or continuous power

1) When the solenoid valve needs to be opened for a long time, and the duration is longer than the closing time, should choose normally open type;

2) If the opening time is short or the opening and closing time is not long, choose the normally closed type;

3) But for some working conditions for safety protection, such as furnace flame monitoring, can not choose normally open type, should choose long current type.

4, according to the environmental requirements to choose auxiliary functions: explosion-proof, check, manual, waterproof fog, water shower, diving. Select solenoid valve according to pipeline parameters.