There are many types of electronic valves available, depending on the application. The function of an electronic flow valve depends on which type you have and what operation you require. We have created this quick-start guide to help you understand the various functions and types of electronic or flow control valves.
About Electric Valve
Electronic valves transform electrical energy into mechanical energy, which triggers the magnetic response. The electric valve is activated when an electrical current flows through the coil of wire. If activated, the electrics in pneumatic valves and hydraulic valves regulate the flow of fluids when a power system is moving. There are numerous kinds of electric valves that are available and pilot-operated or direct-acting valves are the two most common kinds. When choosing the right electric valve it’s crucial to be able to answer any questions regarding the use and make sure that you select an appropriate valve.
- Direct Acting Electronic Valve
Direct acting is usually associated with electronic poppet or diaphragm electronic vales. This means that the electronic coil’s position can be affected by the way you energize it. If the valve is in its resting position (see below), then the electronic coil will be activated in a direct-acting electronic flow valve. This will cause the diaphragm to move in the open position. This does not necessarily indicate that the core tube of a valve is connected to the diaphragm. However, the electrical state allows for direct control. An electronic pressure control valve that acts directly is able to operate completely without any pressure differential. The valve can operate fully without any pressure differential.
- Pilot operated Electronic Valve
The Indirect Acting electronic valves, also called pilot-operated electronic, are usually of the diaphragm type electronic valve. Pilot operated refers to media that acts as a pilot for the valve’s operation. A small opening in the electronic valve’s inlet port usually allows some media to pass into the cavity above the diaphragm. The media applies pressure to the top diaphragm in a normally closed valve. This holds it closed. The electronic coil opens when the electronic coil becomes active. The diaphragm then opens, and the media is forced back into the main pressure line. An indirect-acting electronic valve has the advantage of saving energy. Indirect-acting electronic valves can be more economical.
- Normally Closed, Normally Open
These terms refer only to the state where the electronic flow valve is resting without any power being applied. These terms are easy to understand, but they can also be used for different purposes. The normal closed electric flow control valve can be described by ‘energize-to-open,’ while the normally open can be described by ‘energize-to close.’
2/2-Way electronic valve is usually a diaphragm or poppet valve. They can only be used for on/off duty because there is no exhaust port. These valves are versatile and can be used in many industries. It is possible to use a 2/2-Way Proportional electric pressure valve to regulate flow.
Most 5/3-Way electronic flow control valves come with two coils. They are always spool valve types and have five ports and three positions. The function of the two positions is the same as the 5/2-Way electronic type. The third position does an additional operation. The third spot, which is generally engaged by spring, is activated when power is not applied to the electronic coil. The third position is most commonly used for a Pressure Held function. This keeps the electronic flow valve and larger actuator/instrument stable until power is applied.
The term 3/2-Way is often used to describe a spool-type solenoid valve. However, it is possible to have poppet-type valves in this particular configuration. The term 3/2 could be interpreted as “3 ports, 2 positions. This formula applies to other electronic flow valve types with an abbreviation similar to that. When they are in their resting position, the most basic 3/2-Way valves have port 1 to act as the valve’s outlet, while port 2 serves for the outlet and port 3 for exhaust. However, it is blocked when in a resting state.
If power is applied through a solenoid spool’s position shifts, port 1 gets blocked, and port 2 flows towards port 3 and thus draining the system. If power is cut off, the spool is re-set to its normal position, and normal valve operation is restored. This is why the 3/2-Way Spool Valve operation is also known as “Sol/Spring. Three-way Spool Valves are most commonly utilized as a plot device for the Single performing Pneumatic Actuator as well as a Pneumatic Cylinder.
A 5/2-Way electronic flow valve can also be often sold as a spool-type solenoid valve. They operate similarly to 3/2-Way valves; however, two ports are used to pilot double-performing pneumatic actuators or pneumatic Cylinders. They can be equipped with a singular coil, allowing the return of springs (known by the name Sol/Spring) or with the double solenoid coil (known by the name Sol/Sol).
There are many options for electronic valves available on the market. It is important to choose reliable and workable components. These include the type of connection, design characteristics, the principle of operation, number of nozzles, material and seal of the membrane, as well as the material and the material of the valve.