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Home > Support > Technical Info > QUEEN Solenoid Valve Specifications and Descriptions

QUEEN Solenoid Valve Specifications and Descriptions

In modern automation and fluid control systems, solenoid valves play a crucial role. To meet the diverse needs of various industries, QUEEN solenoid valves offer a complete range of products, including different switching types—normally closed, normally open, and explosion-proof—as well as various control mechanisms such as direct-acting, semi-direct acting, and pilot-operated valves. Whether for water treatment, steam control, gas regulation, or high-pressure and high-flow applications, QUEEN solenoid valves are trusted across industries for their stable performance, precise design, and high quality. This article provides an overview of the different types and applications of solenoid valves, along with the full specification table of QUEEN solenoid valve models, to help you quickly understand and select the most suitable solution.

QUEEN 2-way solenoid valve available in normally open, normally closed, and explosion-proof types for fluid control applications.

Types of Solenoid Valves

Solenoid valves can be categorized by their switching states into normally closed (NC), normally open (NO), and explosion-proof types to meet a wide range of application requirements. Whether for water control, steam regulation, or high-flow systems, QUEEN offers the most suitable solutions tailored to your needs. Feel free to contact us anytime—we’re here to help you select the ideal solenoid valve for your application.

​A normally closed (NC) solenoid valve stays closed when de-energized, preventing any fluid or gas from passing through. When an electrical current is applied to the coil, it generates a magnetic field that pulls the plunger upward, overcoming the spring force. This action lifts the seal and opens the orifice, allowing media to flow through the valve. When power is cut off, the spring pushes the plunger back down, sealing the orifice and stopping the flow.

A normally open (NO) solenoid valve remains open when de-energized, allowing uninterrupted flow. When electrical current is supplied, the coil produces a magnetic field that forces the plunger downward, overcoming the spring force. This movement closes the orifice and prevents media from passing through. Once the power is turned off, the spring returns the plunger to its open position, restoring flow.

QUEEN explosion-proof solenoid valves are equipped with imported explosion-proof coils from Italy, rated Ex mb II T4 Gb for hazardous environments. These valves are widely used in petrochemical, natural gas, and pharmaceutical industries.

Explosion-proof solenoid valves are available in the following models based on fluid type:

Further Reading: How Does a Solenoid Valve Work: Normally Closed & Normally Open

Solenoid valves can also be classified based on their operating mechanisms, which determine how they control fluid flow. The main types include direct-acting, semi-direct acting, and pilot-operated solenoid valves. Each type operates differently and offers specific advantages depending on system requirements.

  • Direct-acting Solenoid Valve

Direct-acting solenoid valves operate independently of external pressure. When the coil is energized, electromagnetic force lifts the valve plunger, opening the valve and allowing fluid or gas to pass through. When the power is turned off, a spring pushes the plunger back to its original position, closing the valve.

Direct-acting solenoid valves are available in the following models based on the type of fluid used:

  • Semi-direct acting Solenoid Valve

Semi-direct acting solenoid valves combine the features of both direct-acting and pilot-operated types. Unlike purely direct-acting valves, the plunger is directly connected to a diaphragm or piston, allowing the valve to operate even without pressure differential. At the same time, it can utilize system pressure to handle higher flow rates, offering greater flexibility for a wide range of applications.

Semi-direct solenoid valves are available in the following models based on the type of fluid used：

  • General fluid applications (such as water, air, light oil, inert gases, and low vacuum)：MA-10~15、MD-10~50WAG

  • Applications for Steam：MK-10S~25S

  • Pilot-operated Solenoid Valve

Pilot-operated solenoid valves rely on pressure differentials to control fluid flow and typically require a minimum operating pressure to function properly. Unlike direct-acting solenoid valves, the coil in a pilot-operated valve controls only a small pilot valve. The opening and closing of the main valve are driven by pressure changes, significantly reducing the energy required to operate larger valves. This design makes them ideal for high-pressure and high-flow applications.

Pilot-operated solenoid valves are available in the following models based on the type of fluid used：

Further Reading: What Is a Solenoid Valve? Structure, Advantages, and Differences Compared to Motorized Valves

Solenoid Valve Label

Before starting the installation, it is essential to ensure that the solenoid valve meets the application requirements. QUEEN solenoid valve label showing model, connection size, voltage, fluid type, temperature limit, valve type, and pressure range for understanding specifications before installation.

A: Solenoid valve model
B: Connection specification and port size
C: Input voltage
D: Applicable fluid
E: Maximum fluid operating temperature
F: Type of solenoid valve
G: Fluid operating pressure range

QUEEN solenoid valve label showing model, connection size, voltage for understanding specifications before installation.

Solenoid Valve Coils

When selecting a solenoid valve, the coil’s protection level (IP rating) is a key factor in ensuring the durability and safety of the equipment. QUEEN solenoid valves offer two main types of coils based on different application requirements:

  • Iron Case Coil (IP54)

  • Features: Provides basic dust protection and splash resistance, suitable for standard indoor environments.

  • Applications: Commonly used in factory automation equipment, pneumatic control systems, and areas where high waterproofing is not required.

  • Advantages: Cost-effective and easy to install.

鐵殼型電磁閥線圈 | Solenoid Valve Coil - Iron Case type

  • Waterproof Coil (IP65)

  • Model: M10, M13, M16, M17

  • Features: Fully dust-tight and resistant to medium-pressure water jets, ideal for outdoor, humid, or high-dust environments.

  • Applications: Suitable for water treatment systems, food processing equipment, outdoor piping systems, and other harsh conditions.

  • Advantages: Excellent weather resistance, extends coil lifespan, and improves operational reliability.

M13防水型線圈 | M13 Waterproof Coil

Waterproof coils with model numbers starting with “M” stand for “Molding”, which refers to an encapsulated or molded coil design. These coils are fully sealed with resin, offering excellent protection against moisture, dust, and external damage. The numbers (10, 13, 16, 17) indicate the coil orifice size — the larger the number, the larger and more powerful the coil, making it suitable for controlling higher flow rates or operating larger valve bodies.

When choosing a coil, it is important to evaluate the actual environmental protection requirements. If the equipment is exposed to moisture or dust, it is recommended to use an IP65 waterproof coil to ensure long-term stable operation.

Diaphragm of solenoid valve

QUEEN’s MA and MD series solenoid valves are classified into semi-direct acting and pilot-operated types based on their actuation method. The key sealing component within these valves is the diaphragm. Below is an overview of commonly used diaphragm materials to assist users in selecting the most suitable product based on the actual fluid and environmental conditions.

​

Model Identification:

For MA and MD series, different diaphragm materials can be selected:

  • NBR: No additional marking (default)

  • EPDM: Marked as EP

  • Viton (FKM): Marked as V

  • NBR

  • Operating Temperature Range: -5°C ~ +80°C

  • Advantages: Excellent oil resistance, wear resistance, economical price, widely used in general oil and air systems

  • Disadvantages: Poor resistance to ozone and weather aging, weak resistance to polar solvents (such as ketones, aldehydes, nitro hydrocarbons)

  • EPDM

  • Operating Temperature Range: -10°C ~ +130°C

  • Advantages: Suitable for polar fluids such as water, steam, alcohol, and ethylene glycol; excellent acid, alkali, and weather resistance

  • Disadvantages: Not resistant to mineral oils, fuel oils, and aromatic hydrocarbons; tends to swell when in contact with oil

  • FKM / Viton

  • Operating Temperature Range: -10°C ~ +120°C

  • Advantages: High resistance to heat, oil, and most chemical solvents; excellent aging and ozone resistance

  • Disadvantages: Sensitive to certain polar solvents (such as ketones, esters, ethylene glycol); relatively high cost

Sol-Valve Spec Table

Solenoid Valve Specification Table

Solenoid Valve Specifications and Descriptions

Introducing the various types and applications of QUEEN solenoid valves, along with a specification table of the full product range, to help you quickly understand and select the most suitable solution for your needs.

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