Bluetrend (Shanghai) Industrial Equipment Co., Ltd.
We are good quality supplier of Electric actuators Motorized Butterfly Valve from China.
|Place of Origin:||China|
|Minimum Order Quantity:||Negotiation|
|Packaging Details:||standard sea worthy packing|
|Delivery Time:||7-14 working days|
|Supply Ability:||100 sets per week|
|Name:||Pneumatic Actuator||Certificate:||CE ISO|
|Temperature Of Media:||Normal Temperature||Power:||Pneumatic|
air operated valve actuators,
air torque actuators
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
NUMUR standard indicator, easy to install valve accessories such as limit switch, positioner.
Plating nickel alloy steel, high precision one-piece output shaft in accordance with NAMUR, with ISO5211
ASTM6005 die-casting aluminum alloy cylinder, with hard anodized
Die-casting aluminum powder spraying a variety of colors
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.
Two independent stroke adjustment screws can be easily and precisely adjustable of ?5 ?open and closed position.
High performance springs using high quality materials, coating treatment, pre-loading assembly.
the single-acting actuator, by changing spring quantity to meet different torque output range.
Bearings, guide: Using low friction, long-life compound material, to avoid the direct contact between metals, repair and replacement are easy and convenient.
Normal temperature using nitrile butadiene rubber. High or low temperatures using fluorine rubber or silicone rubber
Double acting, single acting
Available accessories: Reversing solenoid valve, Limit switch/ position monitoring switch, positioner, hand wheel device.
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
|Stage||Fault Description||Fault Cause||Remedy|
|I/P check||I/P air pressure output does not change||Gas source failure||Check if the air supply valve is open|
|Check if the pipeline is blocked|
|Control signal failur||Check if the signal line is disconnected|
|Control signal line "+" "-" is reversed|
|Adjustment valve||The regulating valve will not move or the action will not be in place||No air source||Check if the air supply valve is open|
|Gas circuit connection is incorrect||Check the correctness of the gas circuit connection|
|Gas circuit blockage||Check and ventilate the circuit|
|Give way||Check for leaks and fix|
|Adjustment valve stuck||Contact the aircraft to solve|
|Regulating valve and accessory connection is not strong||Check the connection of the regulating valve and accessories, it should be fixed firmly, no looseness|
|I/P failure||Check I/P|
|Solenoid valve is not powered or de-energized||Check solenoid valve power|
|Valve not in automatic position||Switch to automatic position|
|DCS has a mandatory signal||Contact run processing|
|Some valves must be reset to the local after losing gas.||Local reset|
|Position transmitter current output is not allowed||Not securely connected to the regulating valve||Check the connection, it should be fixed firmly, no looseness|
|Zero position, range has changed||Re-zeroing, measuring the whole|
|Position transmitter is damaged||Potentiometer is bad|
|Travel switch does not work||Incorrect installation||re-install|
|Loose travel switch||readjust|
|Travel switch damage||replace|
|Regulating valve moves in the opposite direction||Locator direction adjustment error||readjust|
Contact Person: Ms. karen