Double action pneumatic cylinder

Double action pneumatic cylinder  

The feature of our products:
1.They are widely used in petroleum and petrochemical,steel,shipbuilding,energy,electric powder,water treatment,paper making,oil refining,matallurgy,air conditioning,electronics and other industries.
2.The extruded cylinder body is made of high quality aluminum alloy with fine machined socket and hard anodized outer surface( anodisation would be provided at special occasion + teflon coat)to prolong the service life and lower the coefficient of friction.
3.Die-casting aluminum powder polyester painted in different colours,PTFE or Nickel plated.
4.The two independent extemal travel stop adjustment bolts can adjust ±5°at both open and close directions easily and precisely.
5.Made from low friction,long-life compound material,to avoid the direct contact between metals.The maintenance and replacement are easy and convenient.
6.NBR rubber O-rings provide trouble-free operation at standard temperature ranges,for high and low temperature applications Viton or Silicone.
7.Temperature range -20°C to +80°C  (-Standard ) ., -35°C~+80°C( Low temperature ), -15°C~+150°C ( High temperature ).
8.Better price and good quality,if you have a trial order ,you will hope a long-time cooperation with us.

Product structure:

1.Indicator

In field visible indicator and standard socket in accordance to VDI/DE3845,NAMUR could be installed and export all the accessories such as limit switch cabinet electric localizer and position sensor.

2. Pinion

The pinion is high-precision and integrative,made from nickelled-alloy steel,full conform to the lastest standards of ISO5211,DIN3337,NAMUR,The dimensions can be customized and the  stainless steel is available.

3. Actuator Body

The extruded cylinder body is made of high quality aluminum alloy with fine machined socket and hard anodized outer surface( anodisation would be provided at special occasion + teflon coat)to prolong the service life and lower the coefficient of friction.

4. End caps

Die-casting aluminum powder polyester painted in different colours,PTFE or Nickel plated.

5. Pistons

The twin rack pistons are made from Die-casting aluminum treated with Hard anodized or made from Cast steel with galvanization,Symmetric mounting position,long cycle life and fast   operation,reversing rotation by simply inverting the pistons.

6. Travel adjustment

The two independent extemal travel stop adjustment bolts can adjust ±5°at both open and close directions easily and precisely.

7. High performance springs

Preloaded coating springs are made from the high quality material for resistant to corrosion and longer service life,which can be demounted safely and conveniently to satisfy different requirements of torque by changing quantity of springs.

8. Bearings&Guides

Made from low friction,long-life compound material,to avoid the direct contact between metals.The maintenance and replacement are easy and convenient.

9. O-rings

NBR rubber O-rings provide trouble-free operation at standard temperature ranges,for high and low temperature applications Viton or Silicone.

10.  fasteners

All the fasteners are made of stainless steel to be resistant to corrosion for a long time.

Parts and material :

Operating principle of DA double acting type

      When the air source pressure comes into the cylinder body between the  two pistons from air entrance(A)and pushes the pistons toward the ends of the cylinder body,the air between the pistons and the ends of the cylinder body is released from air entrance(B), actuator two piston racks synchronous drives the output shaft to rotate counterclockwise(0°-90°) .

     The same, when air source pressure comes into the ends of the cylinder body from air entrance (B)and pushes the pistons toward each other with the air between two pistons released from air entrance(A),the output shaft(gear wheel)would be driven by the racks of the pistons simultaneously to rotate clockwise (90°-0 °).  

    (If the pistons are assembled in different directions from each other,the output shaft would turn out to rotate inverse direction,namely the double acting reverse "CCW" type).

Output torque of double acting actuators:                                                        Unit:Nm

The model of the double acting actuators

      An increment should be added to the identified valve torque for safe when select the pattern of the pneumatic actuator.For vapor or non-lubricant liquor medium, the increment should be up to 25% of the valve torque,30% for non-lubricant pasting liquor medium,40% for non-lubricant dry air medium,60% for non-lubricant particle medium delivered be air and 20% for lubricating clean medium with low friction respectively, (the safe increment above is recommended in theory for reference) 

 Example:

·The torque needed by valve= 100Nm

·The torque considered safety factor(1+30%)=130N·m

·Air Supply=5Bar

 According to the above table,we can choose the minimum model is JHA0160DA

Note: Make sure that the torque necessary to operate the valve is compatible with the actuator torque (it depends on both actuator type and air supply).

Please note that the requested torque depends not only on the valve, but also on the working conditions and the safety margins of the plant, too.

Operating conditions:

1,Operating media: Dry or lubricated air, or the non-corrosive gases The maximum particle diameter must less than 30 μm 
2,Air supply pressure:
The minimum supply pressure is 2.5Bar
The maximum supply pressure is 8Bar
3,Operating temperature:
Standard: -20°C~+80°C
Low temperature: -35°C~+80°C
High temperature:-15°C~+150°C
4,Travel adjustment:Have adjustment range of ±5°for the rotation at 0°and 90°
5,Application: Either indoor or outdoor

Dimension: