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A When a certain amount of drainage is accumulated, the automatic discharge operation is the same for N.O. (normally open) and N.C. (normally closed) types.
When the air pressure in the outlet side piping (inside the auto drain) of the air source is less than 0.1 MPa with the air source (compressor) turned OFF, the valve of the auto drain opens and the accumulated drain is discharged.
This is for the N.O. type auto drain. In contrast, the N.C type auto drain maintains the closed state even when pressure is removed.
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A If the pressure in the bowl is lower than the outlet pressure, the flow is reversed and bubbles are generated at the end of the oil passage (element part).
Possible causes of low bowl pressure are as follows. ① The IN-OUT are reversely connected. ② There is leakage from the bowl O-ring. ③ There is leakage from the lubrication plug O-ring. Take appropriate measures.
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A If the outlet pressure of the regulator rises above the set value, the relief type releases excess pressure above the set pressure to the outside, whereas the non-relief type does not.
The relief type is generally selected for use with air. And when a special sealed circuit is used or when fluid leakage into the surrounding atmosphere is not desirable (such as in a clean room), the non-relief type should be selected.
Note that with the non-relief type regulator, the outlet pressure cannot be reduced even if the knob is rotated counterclockwise (the direction in which the outlet pressure setting is released). Consideration should be given to the method of relieving outlet pressure.
Note 1) Even for regulators with a relief mechanism, there is a slight difference between the relief start pressure and the set pressure.
Note 2) The relief function lowers the pressure to the set value by releasing the outlet pressure from the relief hole in the center of the diaphragm to the atmosphere when the outlet pressure becomes higher than the set pressure. Because the relief capacity is small, it is not possible to release the pressure on the machine side or quickly discharge the excess pressure resulting from external forces during cylinder operation.
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A Replace AF30/40-A and AF30/40-D series air filter bowl assemblies in the following manner.
① Remove the bowl assembly by pushing the lock button on the bowl assembly down and rotating the bowl assembly 30° to either the right or the left. Then, remove the bowl assembly.
② Mount the new bowl assembly by aligning the marks on the body with the marks on the bowl assembly and inserting the bowl assembly into the body.
Then, rotate the bowl assembly 30゜ (until the lock button pops up) to either the right or the left. Make sure that the lock button is raised and locked at this time.
Note 1) Old AF30/40 and AF3000/4000 series air filter bowl assemblies can be removed/mounted by rotating the bowl assembly 45° to either the right or the left.
Note 2) For AF10/20 series air filter bowl assemblies, remove the bowl assembly by turning it counterclockwise.
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A If the supply pressure is turned OFF without changing the input signal, the solenoid valve built into the regulator continues to operate while generating a buzzing sound, affecting the life of the solenoid valve.
This is why the power needs to be turned OFF.
When the source pressure is down, and the input signal to the regulator is 0% (0 MPa), the solenoid valve stops operating.
Why is it stated in the precautions for the ITV series electro-pneumatic regulator that the power should be turned OFF when the supply pressure is cut?
Also, is there anything else that needs to be done?
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A ITV series regulators continuously control the air pressure in proportion to the electrical signal. There are current control, voltage control, and communication control types for electrical signals. The valve body has a 3-port shape with a separate relief exhaust. The pressure acting on the diaphragm is kept constant by opening and closing the solenoid valves on the supply and exhaust sides inside the regulator. The opening and closing of the valves is precisely by the feedback of the pressure sensor, and the regulator has characteristics s controlled imilar to those of a precision regulator. ![ITV series electro-pneumatic regulator]( "ITV series electro-pneumatic regulator")
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A Set the pressure using the knob by moving it in the upward direction while checking the pressure indicated on the pressure gauge (outlet side).
After setting the pressure, be sure to lock the knob.
Moving the knob in the downward direction may cause the pressure to drop below the initial setting.
The knob rotates clockwise to increase pressure and counterclockwise to decrease pressure.
The setting range of the outlet pressure is 85% or less of the inlet pressure. Setting above 85% will leave the product susceptible to fluctuations in flow rate and inlet pressure, and operation may become unstable.
The pressure of the regulator decreases when air is consumed on the downstream side, but it returns to the set pressure when consumption stops.
Refer to the “Flow Rate Characteristics” graphs in the AR series catalog to calculate how much the outlet pressure will drop from the set pressure.
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A For the standard ITV1000/2000/3000 series electro-pneumatic regulator, either a 4-point or 16-point preset input type can be selected.
The type with 4 points can output up to 4 preset pressures by combining the ON/OFF settings of the 2 input signals of the switch.
The type with 16 points can output up to 16 points by combining the ON/OFF settings of the 4 input signals of the switch.
It is recommended that the pressure be set to 0 MPa for one of the preset pressures for safety reasons.
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A When the power is turned OFF when in a control state, both the built-in solenoid valves for air supply and exhaust are closed. As a result, the pressure in the pilot chamber is maintained, so the outlet pressure is also able to be maintained at a pressure near the set pressure. However, there is always internal leakage present with ITV series regulators, so the retention is temporary and cannot be guaranteed.
