Basic Professional Knowledge of Normally Open Solenoid Valves Explained

I. Safety performance

1. Corrosive media: a PTFE rod or an all-normally open solenoid valve should preferably be selected; for strongly corrosive substances, a high-pressure solenoid valve manufacturer must adopt a protective pulse damper type.

2. Neutral substances: a solenoid valve with an alloy copper valve housing material can be selected; otherwise rust chips often fall off in the valve housing, especially in places where the position is not repeated. Ammonia cannot use a copper valve.

3. Flammable environments: products of a matching rating must be adopted; in outdoor or dusty places, an explosion-proof, contamination-resistant type of solenoid valve should be selected.

4. The pressure rating of the solenoid valve should be higher than or exceed the maximum pressure in the pipeline.

II. Scope of application

1. Medium characteristics:

1.1 Gas, liquid, or mixed states should each use different categories of imported gas solenoid valves, otherwise operating errors are easily caused.

1.2 Medium temperature: as the medium temperature differs, select a product of matching flame-retardant grade; otherwise it is easily burned through or penetrated, and the rubber seals easily become brittle, reducing the service life.

1.3 Viscosity: generally below 20 CST; if higher than this value, a piston-type normally open solenoid valve should use a multi-function solenoid valve with a pipe diameter above 15 mm; a steam solenoid valve manufacturer does not recommend a solenoid valve with a small pipe diameter.

1.4 When the medium cleanliness is not high, a back-flush filter screen needs to be installed in front of the solenoid valve. When the working pressure is low, a direct-acting or step-by-step direct-acting pulse damper solenoid valve is used.

1.5 If the medium flows in a fixed direction and backflow is not allowed, the special requirement must be clearly stated.

2. Pipeline basic parameters

2.1 According to the medium inflow and pipeline connection method, select the pipe diameter and specification model of the corrosion-resistant normally open solenoid valve.

2.2 According to the user flow and the valve Kv value, select the valve nominal pressure pipe diameter; it can also be the same as the pipe inner diameter.

2.3 Working pressure difference: when the minimum working pressure difference is above 0.04 MPa, use the pilot type; when the minimum working pressure difference is close to or equal to 0, a direct-acting or step-by-step direct-acting type must be used.