Brass Solenoid Valves for Automatic Fluid Control

We offer brass solenoid valves for the automatic control of liquids and gases in industrial processes. We also have direct-acting and pilot-operated models to suit different flow rates and pressures, so you'll always find the right configuration for your process. Furthermore, all are available in normally closed or normally open versions.

What is a solenoid valve and how does it work?

A solenoid valve controls fluid flow using an electric coil that activates an internal plunger. When the coil is energized, the plunger moves and instantly opens or closes the fluid path. This eliminates the need for manual intervention and allows process automation from a PLC, timer, or remote control system. In addition, its response is almost immediate, making it the ideal solution for rapid and frequent cycles.

Types of action: direct vs. pilot-operated

Before choosing a solenoid valve, it's important to understand the difference between direct-acting and pilot-operated. For example, both use an electric coil, but they operate differently depending on the system's flow rate and pressure. Below, we explain each type:

• Direct-acting: The coil acts directly on the plunger without the need for a differential fluid pressure. Therefore, it operates from zero pressure, including systems with no line pressure. Moreover, it is the simplest and most economical option for small diameters and low flow rates. Thus, it is ideal for irrigation, laboratory, and low-pressure processes.
• Pilot-operated: Uses the fluid's own pressure to assist in opening or closing the valve. This allows it to handle much higher flow rates with a lower power coil. However, it requires a minimum differential line pressure to operate correctly. Therefore, it is the recommended option for larger diameter and higher flow systems in industrial and HVAC applications.

Resting position: normally closed vs. normally open

Another key decision when selecting a solenoid valve is its resting position. Therefore, it is essential to choose the correct one according to your process's safety logic. Below, we explain the difference:

• Normally Closed (NC): The valve remains closed when there is no electrical power. This means that in the event of a power outage, the flow automatically stops. Therefore, it is the most common option in systems where closure is the safe condition, such as irrigation, water dispensers, and industrial safety systems.
• Normally Open (NO): The valve remains open when there is no electrical power. Therefore, it only closes when the coil is energized. It is the correct option when the flow must remain active by default and only be interrupted under specific conditions, such as in cooling systems or continuous water supply.

Available models: standard and special versions

Below are the main models available in our collection. All feature a high corrosion-resistant brass body and NPT threaded connection for quick installation without adapters:

• Direct-acting NC Solenoid Valve — High Flow: This is the most versatile model for water, air, and neutral fluids. It operates from zero pressure, so it does not require minimum line pressure. Therefore, it is ideal for irrigation systems, potable water, and general industrial processes.
• Direct-acting NC / NO Solenoid Valve — High Temperature: Features Viton seals resistant to high temperatures. Therefore, it is suitable for low-pressure steam, hot water, and high-temperature fluids. It is available in both normally closed and normally open versions.
• High-Pressure Solenoid Valve: Designed for systems operating at pressures higher than standard. Therefore, it is the required option in compressors, hydraulic systems, and high-pressure gas lines. Its reinforced construction ensures a hermetic seal even under demanding conditions.
• 3-Way Direct-acting Solenoid Valve: Allows diverting flow between two outlets with a single coil. This makes it ideal for systems that require switching between two circuits or for purging process lines. Therefore, it simplifies installation by eliminating the need for two independent valves.

Available models: pilot-operated versions and alternative materials

In addition to standard models, we have pilot-operated versions and stainless steel bodies for more demanding applications. Therefore, if your process handles high flow rates or requires greater corrosion resistance, you will find the right option below:

• Pilot-operated NC Solenoid Valve: Ideal for larger diameter systems where high flow rates need to be handled with low coil power consumption. It operates with minimal differential line pressure. Therefore, it is common in agricultural irrigation systems, industrial HVAC, and process water.
• Pilot-operated NO Solenoid Valve: Combines the advantage of pilot operation with the normally open resting position. Therefore, it is the correct option for continuous supply systems that only need to be interrupted under specific conditions. Its low energy consumption makes it efficient in long-term installations.
• Direct-acting NC Solenoid Valve — Stainless Steel Body: Although this collection focuses on brass, we also offer this model in stainless steel for processes where brass is not compatible with the fluid. Therefore, it is ideal for slightly corrosive fluids or when installation standards require stainless steel.

General technical specifications

All our models share technical characteristics that facilitate their selection and installation. For example, the available voltages and connections cover most industrial applications in Mexico. Below are the most important specifications:

• Available voltages: 24V DC, 110V AC, and 220V AC. Therefore, they are compatible with most electrical control systems in Mexico.
• NPT threaded connections: From 1/8" to 1½". Additionally, the NPT thread facilitates direct installation in pipes without the need for additional adapters.
• Available seals: NBR for water, air, and neutral fluids. Also, Viton for high-temperature fluids, oils, and low-aggressiveness solvents.
• Number of ways: 2-way (NC or NO) for simple flow control. Also available in 3-way for diverting or mixing flows in a single body.
• Body material: High corrosion-resistant brass for most models. Finally, we also have stainless steel bodies for more demanding applications.

Industrial applications

Our brass solenoid valves are used in a wide variety of industries and applications. For example, any process that requires automatically opening or closing fluid flow is a candidate for using this technology. Also, their low cost and ease of installation make them the most efficient option for automating fluid control systems:

• Agricultural and industrial irrigation: For automating irrigation zones with timers or PLCs. In addition, direct-acting NC models are the most used in this sector due to their zero-pressure operation.
• HVAC and air conditioning: For controlling the flow of cold water, hot water, and steam in air conditioning systems. Therefore, we recommend pilot-operated NO models for continuous supply systems.
• Manufacturing and general industry: For automating process lines with water, compressed air, and neutral fluids. Also, 3-way models are very useful for diverting flows between two circuits without installing additional valves.
• Potable water and treatment: For automatic control in treatment plants, dispensers, and dosing systems. Therefore, we recommend models with NBR seals and brass or stainless steel bodies as required by the installation.
• Pneumatic and gas systems: For controlling the flow of compressed air and neutral gases. In addition, high-pressure models are suitable for compressors and high-pressure gas distribution lines.

Why choose CEMATIC?

• 11 models available in stock with immediate delivery throughout the Mexican Republic.
• In addition, we offer free technical advice to select the correct model, voltage, and seal.
• We also have competitive prices and promotions on selected models.
• Furthermore, all models feature standard NPT connection for quick and hassle-free installation.
• Finally, we provide service by phone, WhatsApp, and email with same-day response.