--- title: "Solenoid Valve Types: Complete Guide for Industrial Applications" date: 2026-09-20T09:04:00Z modified: 2026-09-22T06:49:33Z permalink: "https://www.tgvalve.com/blog/industrial-valves/solenoid-valve-types/" type: post status: publish excerpt: "" wpid: 3718 categories: - Industrial Valves featured_image: "https://www.tgvalve.com/wp-content/uploads/2026/09/image1-3.webp" featured_image_alt: "Featured blog graphic titled Solenoid Valve Types: Complete Guide for Industrial Applications, displaying 2-way and 3-way schematic diagrams, direct-acting vs pilot-operated comparisons, a large industrial ball valve, and the CTGV logo." timestamp: 2026-09-22T06:49:33Z tags: - Industrial Valves --- ## Quick Answer: There are two main categories for [solenoid valve types](https://www.tgvalve.com/wp-content/uploads/wp-mfa-exports/post/pneumatic-vs-electric-valve-actuation-selection-guide.md): direct-acting and pilot-operated designs. Configurations include 2-way, 3-way, and 4-way models, built as normally open or normally closed units. TG Valve engineers electric, pneumatic, and hydraulic actuated valves as automation alternatives when standard solenoid valves cannot meet flow or pressure demands.The company holds relevant CE, API, and ISO certifications, with valve testing conducted to standards including EN 12266 and DIN 3230, verified through 13 in-process QC checks across 300+ inspection devices. ## What Is a Solenoid Valve and How Does It Work? ![Infographic explaining how a solenoid valve works, detailing the electromagnetic principle with a coil and moving plunger, and illustrating the valve automation process showing the solenoid energized (open) and de-energized (closed) states with fluid flow paths.](https://www.tgvalve.com/wp-content/uploads/2026/09/image2.webp) A solenoid valve is an electronically operated valve that starts, stops, or redirects the flow of liquid or gas. The solenoid working principle demonstrates the use of a coil that builds a magnetic field once powered. This magnetic field pulls a plunger or armature and shifts the valve between open and closed positions. Engineers use our valves to automate the flow of liquids and gases like water, air, gas, and steam. Their fast 100 ms (or less) switching time makes them perfect for applications that need to quickly turn the flow on and off. Plants have found that these valves require less maintenance than manually operated valves. Most operate on standard AC or DC voltages making it easy to connect to most control panels in the plant. ## What Are the Main Solenoid Valve Types Based on Operation? There are two types of solenoid valves based on operation: the direct-acting and pilot-operated designs. In a direct-acting solenoid valve, the movement of the plunger is actuated by the coil itself, regardless of the line pressure. It is very effective for small diameters of piping, usually below 25mm, and operates even when there is no pressure. Direct-acting valves can be used in vacuum systems and laboratories where there is no flow. Speed remains good but the coil needs to be large. A direct-acting solenoid valve uses the coil to move the plunger directly, without relying on line pressure. It works well on small pipe sizes, typically under 25mm, and functions even at zero pressure. Direct-acting models suit vacuum lines, lab equipment, and low-flow dosing systems. Response speed stays high, though the coil must grow larger to handle bigger orifices. On the other hand, a [pilot-operated solenoid valve](https://www.tgvalve.com/wp-content/uploads/wp-mfa-exports/post/how-to-install-a-butterfly-valve.md) uses a small pilot orifice to leverage upstream pressure for the main valve action. This design handles larger flow rates and higher pressures with a smaller coil. Pilot-operated valves require minimum pressure differential to function correctly, often 0.5 bar or higher. They fit steam lines, compressed air systems, and larger process pipelines. ## What Are 2-Way Solenoid Valve and 3-Way Solenoid Valve Configurations? ![Infographic detailing solenoid valve port configurations including 2-way on/off control, 3-way diverting and actuation, and 4-way double-acting actuator control, with labeled diagrams for inlet, outlet, supply, exhaust, and flow paths.](https://www.tgvalve.com/wp-content/uploads/2026/09/image3-2.webp) Solenoid valve configurations control flow through two, three, or four ports. A 2-way solenoid valve has one inlet and one outlet, acting as a simple on-off switch for a single flow path. It suits water supply lines, irrigation systems, and basic shutoff applications. A 3-way solenoid valve adds a third port, letting it divert flow between two paths or vent pressure from an actuator. These valves commonly drive pneumatic cylinders and pilot control circuits. Four-way valves use different spool positions to direct supply and exhaust flow to the two ports of a double-acting actuator. Buyers select port count based on how many flow paths the system must manage simultaneously. ## What Is the Difference Between a Normally Open and a Normally Closed Solenoid Valve? The difference between normally closed and normally open valves is their default, unpowered position. A normally closed valve remains closed when the coil is de-energized, making this configuration suitable for applications that require flow to stop when the control signal is removed. Meanwhile, normally open valves work the opposite way, staying open until energized, then shutting to block flow. Plants use normally open valves for continuous processes that must fail in the open state, such as certain cooling loops. Choosing the correct default state protects equipment and personnel during unexpected outages. Design teams should document this choice clearly on P&ID drawings to avoid confusion during maintenance. ## How Do You Choose the Right Solenoid Valve Type for Your System? Selecting the right valve depends on pipe size, pressure, media type, and response speed. Engineers should match orifice size to required flow, known as Cv, and confirm minimum pressure differential for pilot-operated designs. Media compatibility matters too, since corrosive fluids need specific body and seal materials. Buyers must also check voltage, duty cycle, and ambient temperature ratings before ordering. Ambient conditions, including vibration and washdown exposure, also influence enclosure rating choices. For larger pipelines, standard types of solenoid valves often cannot deliver enough force or flow capacity, pushing engineers toward actuated valve alternatives instead. ## What Does TG Valve Offer as an Alternative to Solenoid Valve Types? TG Valve provides [electric, pneumatic, hydraulic](https://www.tgvalve.com/wp-content/uploads/wp-mfa-exports/post/pneumatic-vs-electric-valve-actuation-selection-guide.md), and manual actuation options for industrial valves, depending on the required torque, speed, control method, and application. - **Motorized or Electric Actuator Valves:** TG Valve associates large butterfly and [ball valves with electric motor gear drives](https://www.tgvalve.com/product/high-pressure-forged-floating-ball-valve/). In contrast to the solenoid coil which flips the plunger immediately, the electric operator rotates the valve disc in a few seconds. The benefit is the provision of great torque and electrical actuation from remote locations in large diameter pipes. - **Pneumatic Actuator Valves, Piston or Spring-Return:** These valves use compressed air cylinders to turn or shift the valve mechanically. TG Valve equips them with standard directional control accessories, often including small external solenoid pilot valves. Compressed air, rather than an internal coil, supplies the main power that moves the pipeline valve. - **Hydraulic Actuator Valves:** Hydraulic actuators use high-pressure fluid cylinders to drive valve movement. TG Valve applies these to massive pipelines that need immense force against high system pressure. This goes beyond what small electromagnetic valves can handle. - **Manual Gearbox, Handwheel, or Lever-Operated Valves:** Some projects do not require automated or remote triggers at all. TG Valve fits manual handwheels, worm-gear operators, and lever handles to its butterfly, gate, and [check valves](https://www.tgvalve.com/product/flanged-stainless-steel-lift-check-valve/). Hero Product Highlight [ ![Certified Valve Manufacturer](https://www.tgvalve.com/wp-content/uploads/2025/07/1753926154000.webp) Certified Valve Manufacturer-CTGV Founded in 1985, CTGV Valve Group produces factory-direct industrial valves certified by CE, API, ISO – no intermediaries, just results. View Product ](https://www.tgvalve.com/wp-content/uploads/wp-mfa-exports/page/sample-page.md)## **Conclusion** TG Valve supplies automation systems with electric valves, pneumatic valves, hydraulic valves, and manual valves. Learning how solenoid valves work enables engineers to select an appropriate on/off control system for low diameter pipelines and instrumentation. For larger diameters and high pressures, TG Valve provides such a control system using motorized valves, pneumatic valves, and hydraulic valves.CTGV products are manufactured and tested according to applicable international standards, with certifications and test standards varying by product and specification. Contact TG Valve’s engineering department to choose the proper actuation system for your application. ## Frequently Asked Questions ### 1. Can a coil-driven valve control flow in a pipe larger than four inches? Coil-driven valves rarely handle pipes past two inches efficiently. For larger pipes, engineers typically switch to motorized or air-driven actuated valves, which manage higher flow volumes and pressure without an oversized coil. ### 2. What happens to an on-off automated valve if the power fails? The valve’s response to a power failure depends on its normal position and actuator/control configuration. Some designs close, while others remain open or hold position. ### 3. Why would a plant choose an air-driven actuator over a coil-driven valve? Plants use pneumatic actuators since they can operate bigger and higher pressure valves. They work well in tough environments where electric coils can overheat and fail. Plants have compressed air anyway, so this solution is economical for large pipeline control. [Get Free Quote](https://www.tgvalve.com/wp-content/uploads/wp-mfa-exports/page/contact.md)