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High Performance Pneumatic Air Actuator Easy To Install Valve Accessories

Categories Pneumatic Air Actuator
Brand Name: ACKO
Model Number: DA/SR-45......350
Certification: CE ISO
Place of Origin: China
MOQ: Negotiation
Price: Negotiation
Payment Terms: T/T
Supply Ability: 100 sets per week
Delivery Time: 7-14 working days
Packaging Details: standard sea worthy packing
Name: Pneumatic actuator
certificate: CE ISO
feature: Spring Return
apply: industry
Temperature of Media: Normal Temperature
Power: Pneumatic
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    High Performance Pneumatic Air Actuator Easy To Install Valve Accessories


    High Pressure Pneumatic Air Actuator , Air Torque Spring Loaded Double Acting Actuator​


    A Pneumatic actuator mainly consists of a piston or a diaphragm which develops the motive power. It keeps the air in the upper portion of the cylinder, allowing air pressure to force the diaphragm or piston to move the valve stem or rotate the valve control element.

    Valves require little pressure to operate and usually double or triple the input force. The larger the size of the piston, the larger the output pressure can be. Having a larger piston can also be good if air supply is low, allowing the same forces with less input. These pressures are large enough to crush objects in the pipe. On 100 kPa input, you could lift a small car (upwards of 1,000 lbs) easily, and this is only a basic, small pneumatic valve. However, the resulting forces required of the stem would be too great and cause the valve stem to fail.

    This pressure is transferred to the valve stem, which is connected to either the valve plug (see plug valve), butterfly valve etc. Larger forces are required in high pressure or high flow pipelines to allow the valve to overcome these forces, and allow it to move the valves moving parts to control the material flowing inside.


    The valves input is the "control signal." This can come from a variety of measuring devices, and each different pressure is a different set point for a valve. A typical standard signal is 20–100 kPa. For example, a valve could be controlling the pressure in a vessel which has a constant out-flow, and a varied in-flow (varied by the actuator and valve). A pressure transmitter will monitor the pressure in the vessel and transmit a signal from 20–100 kPa. 20 kPa means there is no pressure, 100 kPa means there is full range pressure (can be varied by the transmitters calibration points). As the pressure rises in the vessel, the output of the transmitter rises, this increase in pressure is sent to the valve, which causes the valve to stroke downward, and start closing the valve, decreasing flow into the vessel, reducing the pressure in the vessel as excess pressure is evacuated through the out flow. This is called a direct acting process.


    Pneumatic actuator working principle


    1, double acting actuator
    A port intake, B port exhaust, push the two pistons separately to the two B port intake, A port exhaust, push the two pistons close to the center
    While moving, the output shaft turns the valve counterclockwise to open the heart, and the output shaft rotates the valve clockwise to close.


    2, single acting actuator
    A port intake, B port exhaust, push the two pistons separately to the two exhaust or power loss, the spring pushes the two pistons close to the center
    While moving, compress the spring at the same time, the output shaft moves counterclockwise, and the output shaft rotates the valve clockwise to close.
    Turn to the direction. Valve open



    Standard technical parameters


    Indicator


    NUMUR standard indicator, easy to install valve accessories such as limit switch, positioner.


    Output shaft


    Plating nickel alloy steel, high precision one-piece output shaft in accordance with NAMUR, with ISO5211

    DIN3337 standard.


    Cylinder

    ASTM6005 die-casting aluminum alloy cylinder, with hard anodized


    End caps

    Die-casting aluminum powder spraying a variety of colors


    Pistons

    Double piston rack, adopts hard anodized aluminum or cast steel galvanized processing, symmetric mounting position, fast operation, long service life, simple upside down the piston can change the direction of rotation.


    Travel adjustment

    Two independent stroke adjustment screws can be easily and precisely adjustable of ?5 ?open and closed position.


    Spring

    High performance springs using high quality materials, coating treatment, pre-loading assembly.


    Simply remove

    the single-acting actuator, by changing spring quantity to meet different torque output range.


    Bearing

    Bearings, guide: Using low friction, long-life compound material, to avoid the direct contact between metals, repair and replacement are easy and convenient.


    Seal

    Normal temperature using nitrile butadiene rubber. High or low temperatures using fluorine rubber or silicone rubber


    Control

    Double acting, single acting


    Annex

    Available accessories: Reversing solenoid valve, Limit switch/ position monitoring switch, positioner, hand wheel device.


    Precautions


    When performing large-scale inspections of actuators, it is necessary to completely discharge the remaining pressure in the pipeline.
    When the actuator is in operation, do not step into the transmission or place your hand in the transmission.
    To prevent an electric shock, do not touch the wire connection (exposed live body) on the actuator with the solenoid valve or switch.
    Be sure to test in the event of a power outage. Also, do not touch these charged bodies with wet hands.


    Pneumatic valve accessories


    Annex 1 Reversing solenoid valve
    The electronic control operation for "turning on" or "off" the pneumatic valve acts as a switching air source. The solenoid valve complies with the NAMUR connection standard and can be divided into a mounted type and a separate type. The double-acting pneumatic actuator is equipped with a two-position five-way solenoid valve, and the single-acting two-position three-way solenoid valve can be manually operated. The structure is simple, compact and has a long life. The solenoid valve coil voltage has AC220V or DC24V low power consumption, and the explosion-proof encapsulation Ex m II BT4 and the explosion-proof Ex d II BT4 are optional. The company's solenoid valve is directly mounted on the actuator in a plate type.

    Working principle Electromagnetic valve junction box wiring diagram



    Annex 2 Limit switch (also known as echo)
    The limit switch box feeds back the pneumatic valve position signal to the control room, directly mounted on the top of the pneumatic actuator, in accordance with VDI/VDE3845, built-in mechanical switch or magnetic induction proximity switch, and optional explosion-proof.
    Built-in 2 mechanical switches 2-SPDT wiring diagram
    Rating: 16A 1/2HP 125/250V AC 0.6A 125V DC 0.3A 250V DC



    Annex 3 Air filter pressure reducing valve
    Including air pressure reducing valve, filter, oil mister.

    Function: gas source is stable, clean, and lubricates moving parts



    Annex 4 Electrical Positioner
    The electric positioner is one of the important accessories of the pneumatic regulating valve. It accepts 4-20mA control valve opening degree, and is divided into mechanical type and intelligent electronic type.


    Mechanical positioner wiring diagram



    Common faults and handling


    StageFault DescriptionFault CauseRemedy
    I/P checkI/P air pressure output does not changeGas source failureCheck if the air supply valve is open
    Check if the pipeline is blocked
    Control signal failurCheck if the signal line is disconnected
    Control signal line "+" "-" is reversed
    I/P damagereplacement
    Adjustment valveThe regulating valve will not move or the action will not be in placeNo air sourceCheck if the air supply valve is open
    Gas circuit connection is incorrectCheck the correctness of the gas circuit connection
    Gas circuit blockageCheck and ventilate the circuit
    Give wayCheck for leaks and fix
    Adjustment valve stuckContact the aircraft to solve
    Regulating valve and accessory connection is not strongCheck the connection of the regulating valve and accessories, it should be fixed firmly, no looseness
    I/P failureCheck I/P
    Solenoid valve is not powered or de-energizedCheck solenoid valve power
    Valve not in automatic positionSwitch to automatic position
    DCS has a mandatory signalContact run processing
    Some valves must be reset to the local after losing gas.Local reset
    Position transmitter current output is not allowedNot securely connected to the regulating valveCheck the connection, it should be fixed firmly, no looseness
    Zero position, range has changedRe-zeroing, measuring the whole
    Position transmitter is damagedPotentiometer is bad
    Travel switch does not workIncorrect installationre-install
    Loose travel switchreadjust
    Travel switch damagereplace
    Regulating valve moves in the opposite directionLocator direction adjustment errorreadjust
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