covna components of pneumatic actuator

27 Components Of COVNA Rack & Pinion Pneumatic Actuator

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The COVNA rack & pinion pneumatic actuator consists of 27 components:

No. Description Qty Standard Material Protection Optional Material
1 Indicator Screw 1 Plastic
2 Indicator 1 Plastic
3 Spring Clip 1 Stainless Steel
4 Thrust Washer 1 Stainless Steel
5 Outside Washer 1 Engineering Plastics
6 Body 1 Extruded Alluminum Alloy Hard Anodized etc
7 Inside Washer 1 Engineering Plastics
8 Cam 1 Alloy Steel
9 O-ring(Pinion Top) 1 NBR Viton/PTFE
10 Bearing(Pinion Top) 1 Engineering Plastics Stainless Steel
11 Pinion 1 Alloy Steel Nickel Plated
12 O-ring(Pinion Bottom) 1 Engineering Plastics
13 Bearing(Pinion Bottom) 1 NBR Viton/PTFE
14 Plug 2 NBR Viton/PTFE
15 O-ring(Adjust Screw) 2 NBR Viton/PTFE
16 Nut(Adjust Screw) 2 Stainless Steel
17 Adjust Screw 2 Stainless Steel
18 Piston 2 Cast Aluminum/Casting Anodized/Zinc Gaslvanized Stainless Steel
19 Guide(Piston) 2 Engineering Plastics
20 Bearing(Piston) 2 Engineering Plastics
21 O-ring(Piston) 2 NBR Viton/PTFE
22 Spring 0~12 Spring Steel Dip Coating
23 O-ring(End Cap) 2 NBR Viton/PTFE
24 End Cap 2 Cast Aluminum Powder Polyester Painted etc
25 Cap Screw 8 Stainless Steel
26 Stop Screw 2 Stainless Steel
27 Nut(Stop Screw) 2 Stainless Steel
covna-installation-electric-actuator

Installation Of COVNA Electric Actuator

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  • Installation Environment

  1. The product can be installed indoor and outdoor.
  2. The product is non-explosion-proof production, and the installation must be avoided being inflammable or explosive environment.
  3. The electric actuator should be in the protection box in the environment of long-term with the splash of rain, material and direct sunlight.
  4. Please reserve space for controller, manual operation.
  5. The surrounding environment temperature should be in -30℃ to 60℃.

  • Temperature Of Working Medium

  1. When matching with the valve, the electric actuator body’s temperature will a bit rise if medium temperature happens heat transfer.
  2. If the temperature or medium is high, the bracket has the function of reducing heat conduction.
  3. Please select the standard bracket if the temperature of the working medium below 60℃.
  4. Please select the standard bracket if the temperature of the working medium above 60℃.

  • Installed On The Valve Body(Figure 3)

  1. Manually operated the actuator to drive the valve, confirm it does not have abnormal situation. Turn the valve in full closed position.
  2. Assemble the bracket to the valve body
  3. Set one end of couplings on valve spindle.
  4. Turn the electric actuator to full closing position, and insert output-input shaft into the square holes of couplings.
  5. Set the screw between the electric actuator and bracket.
  6. Turn actuator by hand shank, confirm that it moves translation, no eccentric, no skew and no overrun.

  • Cable Installation

  1. Install wire tubes as shown in Figure 4
  2. The outside diameter of wire tubes should be ∅9 to ∅11.
  3. Take measures to prevent water.
  4. To prevent actuator from flowing into wire tubes water, the actuation position should higher than wire tubes position.
  5. When installing wire, the outside diameter of wire should be ∅9 to ∅11.
  6. As Figure 5, in case the water flows into actuator interior from line locking, all wire what is not allowed to be used.
  7. The signal wire should be shirlded wire in principle, don’t parallel it to power wire.

     

  • Special Tips

  1. Caution: Can’t connect one actuator parallel with one another, in other words, can’t use the same controlled contact point to control more than one actuator, otherwise it will cause out of control, motor overhaeting, product damage, shorter service life.
  2. If the actuator is installed outdoor, we suggest equipping other protective cover to prevent water, stabilize mechanical property, make a longer service life.

  • Power Voltage: 220VAC 50Hz/60Hz

  • Guard Line Options For Witch Of Cutting-Off Winding

Item Guard Line Motor Power W/F
05 3A 10
10/16 5A 25,30
30/60 7A 40,90
125/250/400 10A 100,120,14
covna-maintenance-electric-actuator

General Failure and Maintenance Of Electric Actuator

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Long-term use of electric actuators, there may happen following 3 issues: Motor Doesn’t Work, The Switch Indicator Doesn’t Work and The Angle Of The Switch Is Constantly Changing.

Failure Phenomenon

Failure Cause

Methods Of Resolution
Motor Doesn’t Work No power Connect the power
Broken wire or the connector is disconnected from the terminal Repair the broken wire, and connect the terminal correctly
Wrong voltage Check the voltage
Overheat protector working(Working temperature too high) Reduce the working environment temperature, use manual control to check whether the valve can be opened properly
Poor action of limit switch Change the switch
Poor capacitance Change teh capacitance
The Switch Indicator Doesn’t Work Light Bulb is broken Change the light bulb
Poor action of limit switch Change the switch
Poor adjustment of the block Adjust it again
The Angle Of The Switch Is Constantly Changing There’s interference from the source Check the signal again
The voltage divider is causing interference Change potentiometer
The gears are loose Check the gears and reinforce the screws on the gears

If you have any issues during using the actuator, COVNA could offer online tech support to help you to solve the problem.