The majority of 3/2 solenoid valves are of the Auto Reset type which means that the valve will change state without external operator influence which is ideal for process automation. Some valves have a non-breathing design which means that the pilot exhaust which is normally passed straight to atmosphere, is vented internally to the exhaust port to prevent any external ingress of corrosive or flammable gases. Consideration should be given to the safe release of the exhausted gas to prevent potentially harmful contamination or even release fo flammable gas to the atmosphere. Many 3 way valves are used in pneumatic circuits for controlling the direction of linear and rotary actuators, using compressed air or gas as the flow medium. External piloted valves however, can be used on very low pressure systems and even on vacuum where the valve is suitable. Internal piloted valves require a minimum operating pressure in order to overcome internal forces to change the valve state. In a 3 way valve, the pilot can be referred to as Internal or External, meaning that the pilot fluid is taken from the inlet (Internal) or from an additional external port (External). The solenoid coil can be very small as it only controls the flow of a small diameter impulse line that allows the fluid to open the main diaphragm or piston. Pilot operation is the opposite of the direct lift principle in that the main force required to open the valve is provided by the media pressure. This direct lift principle works well for small valve sizes or very low pressures but as valve sizes increase, the size of coil and its power consumption rises exponentially making it bulky and expensive. Solenoid valves operate using electromagnetic attraction to move the valve from the seat and most often, a spring to return the valve to the start position. Note that this usually reduces the maximum working pressure compared to an equivalent NC or NO valve. Universal valves can be piped as either NC or NO as well as being used as diverting or selecting functions as the valves can accept flow in any direction. When the coil is energised, the inlet port will close and the flow path from the outlet to exhaust is opened. Normally open (NO) means that the valve is open and fluid flows from the inlet to the outlet and the exhaust port is blocked when the coil is de-energised. The outlet port is connected to the exhaust port when de-energised and this path becomes blocked once the coil is energised, linking the inlet and outlet instead. Normally closed (NC) 3 way valves block the path between the inlet and outlet ports until the coil is energised. Unlike 2 way valves, 3 way solenoid valves will usually have 2 ports open at any one time and which ports are open while the coil is de-energised determines the function. Normally closed, normally open or universal? In addition to material options for the valve body and elastomers for compatibility with a wide range of gases and liquids.
3 way electric solenoid valve manual#
Functional – manual override, manual reset….Environmental – IP65, IP67, ATEX, IECEx, ….Unlike 2 way valves that are intended for isolation purposes, 3 way valves are used for directional control and have 3 function variants – normally closed (NC), normally open (NO) and universal (U).ģ way solenoid valves are used with liquid or gaseous media and can incorporate a huge variety of options: It does not store any personal data.3 Way or 3 port solenoid valves refer to the line connections in that there are 3 ports which makes them ideal for diverting flow from one path to another. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly.