Why is 3/2 pneumatic Valves used mostly to activate single acting pneumatic cylinders?

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Why is 3/2 pneumatic Valves used mostly to activate single acting pneumatic cylinders?

This article we will talk about the 3-2/5-2 pneumatic valves. So, who still wants to know what is Namur valve please read here: http://www.naman-tech.vn/namur-valve/

Today, we will explore more in both pneumatic valves to know why we choose the Namur valve for it. And why 3/2 pneumatic Valves are used mostly to activate single acting pneumatic cylinders.

First, how shall we understand about Pneumatic valves?

Pneumatic valves regulate and control the directional flow of a media within a pipeline process through automation. Generally speaking, in the valve world, pneumatic valves commonly come in one of two traditional rack and pinion configurations:

– Double Acting – Utilizes supplied air to open and close the valve.

– Spring Return – Uses a spring to open and closed the valve.

Both look almost identical and most of the time can only be distinguished by opening up the actuator and observing its internal mechanisms.

Second, what is the 3/2 pneumatic valve?

In general, this is a gas valve, reversing and 3 doors and 2 positions. This is due to the application of electromagnetic force to close the door, which is the most basic and most important operation of the device.

Please, do not ignore this small note that the name of this valve by default is named after the door number and position number.

Electric coil: This is a unit to receive power from the outside, and the basis for the operation of the valve. Depending on the power and needs that divided into some of the types: 24V, 220V … one-way or alternating.

The body of the valve: With this type, the body will have a design of three doors and two, on the body, there is a hole screw into the pneumatic actuator. An inlet for receiving the compressed air of the system and an outlet for converting the compressed air.

# What are 3-2/5-2 pneumatic valves used for and how do they work?

These are electro-valves, which are used to operate pneumatic cylinders.

These pneumatic cylinders mostly give a linear mechanical output. 3/2 Valves are used mostly to activate single acting pneumatic cylinders and 5/2 valves are used to activate double-acting pneumatic cylinders. You can see a 5/2 electro-valve used with a pneumatic cylinder in an automatic bus door.

The application of these valves is widespread. My interaction with these valves is because they are used extensively in textile machines.

Furthermore, 3/2 and 5/2 valves are used with the actuators mainly single acting and double acting cylinders respectively.First one is containing 2 positions with 3 ports (1 supply,1 outlet, and 1 exhaust) and the later one is having 2 positions with 5 ports (2 outlets,2 exhaust, and 1 inlet).

3/2 are mainly used as push buttons and 5/2 is used as the check valve and direction controlling valve.

So, if there is the problem with pneumatic actuator, e.g, a problem with actuator speed, the best way is to use a speed control valve or flow control valve to vary the amount of flow out of the exhaust port of the actuator.

To adjust the speed, the flow must be controlled, whereas adjusting the force of the actuator should be handled by controlling the pressure. Adjusting the pressure may have an effect on the speed, but is not a recommended method to control the speed.

Besides that, you can maintain a constant speed for your pneumatic actuator. You should size a fixed orifice for a constant flow on the exhaust port of the pneumatic actuator in conjunction with a pressure regulator on the input. The pressure regulator will ensure that the output pressure will remain constant (relatively) given a varying input pressure. This fixed orifice will maintain the desired flow to maintain the proper speed of your pneumatic actuator.

# How to install a 3-2 pneumatic valve properly?


– The drawing of the valve system.

– The tools needed for installation.

– The required number of valves and valves.


Examine carefully the location of the installation and determine the pipes to correct fitting.

Then put the pipe head into the correct position on the valve.

Attach the fixed valve to the position and conduct the power supply wiring to the valve, please note the source of the valve is 12-24-220V, one way or alternating.

Finally, the trial operation and review, if any errors, then adjust.

# Error and how to fix and maintain

In the process of using, there will be some cases of problems, disrupt the operation of the whole system, we all point to some common errors and fixes:

The valve does not close or open: the cause of the spring stuck or the power source is broken, or may be due to another cause is bad coils, to overcome us should regularly clean, light up the machine, check the power connector as well as the input steam tube, output etc.

# And here are 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.

  1. 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.

  1. 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

  1. 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.