What is namur valve and why we choose it for pneumatic actuator

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October 30, 2017
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October 31, 2017

What is namur valve and why we choose it for pneumatic actuator

#1. What is namur valve?

Namur valve are electric valves for use with liquids or gases. Valves are controlled by solenoid currents: in the case of two-port valves, the flow is switched on or off; In the case of a three-port valve, the output current is shifted between the two output ports. This device is designed for direct connection to any location on the NAMUR interface. The NAMUR valve has anodized aluminum body, stainless steel pipe, and brass parts. Spring back allows unsafe operation in the event of a power outage, and the exhaust check protects the valve function while in outdoor use. Multiple namur valve can be placed together on a manifold valve.

You can see namur valves products in here: Namur valves for pneumatic actuator

Namur valves are the most frequent control elements in fluid. Their task is to shut off, release, enlarge, distribute or mix liquids. They are found in many areas of application. Solenoids provide rapid and safe switching, high reliability, long service life, good compatibility of materials used, low power control and compact design. The namur valve has two main parts: the solenoid and the valve. Solenoid converts electrical energy into mechanical energy, in turn opens or closes the valve mechanically. Direct acting valves have only a small current circuit, as shown in section E of this diagram (this section is referred to below as the control valve). Valve control valves this small clamping flow by using it to control flow through a much larger hole.

The NAMUR valves are used in compressed electric and water hydraulics systems to control cylinders, electric motors, liquid or larger industrial valves. Automatic irrigation systems also use solenoid valves with automatic control. Dishwashers and dishwashers use namur valves to control water entering the machine. In the football industry, namur valves are often referred to simply as “solenoids”. Solenoid valves are used in dental chairs to control airflow. In the industry, the “solenoid” can also refer to an electromechanical solenoid commonly used to launch a sear.


From, NAMUR, a confused term, is the acronym of the Association of Automated Technology Users in the Processing Industry, and is the standard for automatic valve technology. The standard interfaces for the actuator automatically reduce the solenoid cost and installation. A NAMUR solenoid valve, therefore, is mounted directly on the inlet / outlet pneumatic actuator.

The function of the NAMUR control valve is to control the actuator: a self-controlled valve with an electric solenoid, which opens or closes the valve, by controlling the amount of air – through a pilot – to the pneumatic actuator. . The pneumatic actuator converts compressed air into energy. Solenoid and actuator operate in parallel to control the flow rate, flow rate and flow direction. Similarly, the valve is operated at a normally closed position, or normally open.

Namur valves are available in a number of configurations, including 3 ways and 4 ways. A 3-way solenoid valve typically includes one input, one outlet, and one discharge port, and two seats for liquid control. A 4-way valve with 4 or more ports (2 inlets, 1 outlet, 2 exhausts and 2 seats), and is often used for double acting rack and gear drive operation.

3 way namur valve:

Bonomi manufactures top-of-the-line NAMUR solenoid valves.

The Bonomi NMR3-C1 is a 3 way electromagnetic valve used to operate a single actuator. This solenoid valve is made to a duty cycle of 100% continuous at 2.5 Watts in a pressure of 20 to 120psig and a temp. range from 30 ° to 130 ° F (0 ° to 130 ° F with dry means). The ports are 1/4 “NPT.

Valve 4-spoke solenoid:

Bonomi Series NMR1-4 DIN Diameter:

100% duty cycle continuous at 2.5 Watts; Pressure from 0 to 120psig; Temperatures range from 35 ° to 130 ° F (0 ° to 130 ° F with dry means); Cv = 1.68. 1/4 “NPT.

Bonomi Series NMR1-4 Conduit Line:

Share the same specifications as the DIN model.

Bonomi Series NMR1-4 Wire Wiring / Explosion Proof:

The 4-Way Solenoid NAMUR shares specifications with the electromagnetic valves mentioned above but has a NEMA rating of 7 and is explosion proof. Only use 2.5 Watts power for continuous duty; different voltage options. 1/4 “NPT.

Bonomi can provide namur valves using standard interfaces that make installation easy. Bonomi produces both pneumatic and electric pneumatic valves that can be viewed through the Bonomi Actuated Ball Valves for further reading.

Direct mounting and standard interfaces not only reduce installation costs, but are also faster and simpler than remote integrated pneumatic solenoids. The damage to the pipeline is kept to a minimum, and installers are provided with more room to refit the products together as opposed to being locked into a situation only way.

Although the NAMUR electrode valves still require installers to follow the installation instructions, they provide many benefits, making the application more productive.

#3. Some products about namur valve

Vesta “NAMUR valve” is available in 3/2 and 5/2 versions, with various operations. The valve series has high airflow and no communication environment between the namur valve and the transmission is transmitted. This loudspeaker has a high frequency and can be used with either non-lubricating or non-lubricated air, thanks to a lightweight aluminum needle, nickel is processed by Niploy Processto for a perfect finish.

G1 / 4 “Namur 1,5-8 Bar Sol / Spring 12v DC NBR:

Aluminum 5 way 2 position difference namur solenoid / spring valve.G1 / 4 “, 5mm hole, 304 SS operator, round bronze ball, NBR seat, men o / ride. Media temperature 5 ° C to 80 ° C. Class F insulation, 4.8 Watts, IP65 protection.

The solenoid valve with 5 position 2 positions with namur interface makes it suitable for attaching directly to the pneumatic actuator (both in operation and back to the spring). Standard features include manual override, indicator plug (IP65), encapsulated low voltage coil (AC 5.5 VA, DC 4.8 Watts). Available in all voltages. Comes with mounting screws.

G1/4″ 316 SS 5/2 Namur 1.5-8 Bar Sol/Sol 24v DC IECEx

316 SS body 5 way 2 position difference namur solenoid / solenoid valve.G1 / 4 “NBR seat, manual override. Aluminum coil 24v DC2-8 BAR pressure, temperature environment -20 ° C to 80 ° C Cv 1.1Ex d IIC T6 Gb IP66 Connection M20x1.5 -20 to + 60deg C IECEx C

Our 5 position stainless steel exd approved namur solenoid valves are suitable for hazardous areas where there is a need for a solenoid valve to operate. Configurable solenoid (solenoid).

G1/4″ Namur 1.5-8 Bar Sol/Sol 12v DC NBR

5 way 2 position difference namur solenoid / solenoid valve.G1 / 4 “, 5mm hole, 304 SS operator, copper ball ring, NBR chair, o man / car.1.5-8 BAR pressure range, media temperature 5 ° C to 80 ° C. Class F insulation, 4.8 Watts, IP65 protection.

The 5-position solenoid valve (double solenoid, one end of each end) with the male interface makes it suitable for mounting directly to the pneumatic actuator (both active and return to the spring). Standard features include manual override, indicator plug (IP65), low power coil. Includes screws and pads.