Selection principle of Solenoid Valve

Solenoid Valve has important applications in many industries. The selection of a Solenoid Valve should first follow the four principles of safety, reliability, applicability, and economy.

Here is the content list:

• Safety

• Applicability

• Reliability

• Economy

Safety

First of all, the corrosive medium should choose the plastic king Solenoid Valve and all stainless steel; for the strong corrosive medium, the isolation diaphragm type must be used. For neutral media, Solenoid Valve with copper alloy as the valve shell material should also be used, otherwise, rust chips often fall off in the valve shell, especially on occasions where the action is not frequent. Ammonia valves cannot be made of copper. Then the explosion-proof environment must choose the corresponding explosion-proof grade products, outdoor installation or dusty occasions should choose waterproof and dustproof varieties. The nominal pressure of the Solenoid Valve should exceed the maximum working pressure in the tube.

Applicability

First of all, on the medium, the pipeline fluid and the Solenoid Valve model must match and the medium must be the same. Only in this way can the normal operation of the Solenoid Valve be effectively guaranteed; when the cleanliness of the medium is not high, it should be equipped with a backflush before the Solenoid Valve For the filter valve, when the pressure is low, the direct-acting diaphragm type Solenoid Valve can be used; the second is the selection of the pipeline. The nominal diameter should be selected according to the flow rate and the value of the valve, or the same as the inner diameter of the pipeline. Our solenoid valve with a minimum working pressure difference above 0.04Mpa can choose an indirect pilot type; if the minimum working pressure difference is close to or less than zero, a direct-acting or step-by-step direct type must be used; in the applicable environment, it is corrosive or explosive. For use in the environment, the corrosion-resistant type should be selected first according to the safety requirements; in terms of the applicability of the type, the ordinary Solenoid Valve only has two positions: open and closed. When the control accuracy is high and the parameters are required to be stable, multiple Solenoid Valves should be selected.

Reliability

The work system is divided into three types: long-term work system repeated short-time work system, and short-time work system. For the case where the valve is opened for a long time and only closed for a short time, the normally open Solenoid Valve should be used. When the operating frequency is required to be high, the structure should preferably be a direct-acting Solenoid Valve, and the power supply should be preferably AC. On some occasions, the number of actions is not many, but the reliability requirements are very high, such as fire protection, emergency protection, etc., which must not be taken lightly. It is especially important to take two consecutive double insurances.

Economy

The economy is one of the criteria selected by Solenoid Valve, but it must be economically based on safety, application, and reliability. The economy is not only the price of the product but also its function and quality, as well as the cost of installation, maintenance, and other accessories. More importantly, the cost of a Solenoid Valve in the entire automatic control system and even in the production line is negligible.

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