What is the Selection, Installation And Maintenance of AW Scotch Yoke Pneumatic Actuators?

Hearken Flow Actuator Selection& Installation:

When select the Hearken Flow actuator, the torque of valve must be identified firstly, then consider the pipe media; Add 25% security value when it is steam or non-lubricated media; Add 60% security value when it is non-lubricated dry gas media; Add 100% security value when it is non-lubricated gas transmission particles media; Add 20% security value when it is clean and no friction lubrication media; Then check the double-acting or single-acting type torque form according to air source pressure, and the model of actuator can be chosen correctly.

The pneumatic actuators and valve installation precision is correct, directly influence the actuator safely operation and service life. Reasonable connection installed make actuators center axis and stem coaxial. Actuators with valve assembly to determine valve torque, before, should not be beyond the required torque. After the assembly, the pneumatic actuators and valve and test, the valve pressure rated pressure to seal, actuators to air pressure is 0.4-0.7 MPA or according to the needs of user of pneumatic air pressure, the implementation of the two inlet air intake to switch, observation of the pneumatic valves open and shut case, not due pause, creep phenomenon, should be flexible rotation, and to switch to many repeated tests.

Actuator& Accessory Function:

Hearken Flow Double-acting pneumatic actuator: Double position control of valve’s open or close.

• Spring Return pneumatic actuator: Valve open or close automatically when circuit、gas is cut of or failure(Explosion-proof offer available)
• Single-control solenoid valve: Valve opens or closes when power on, vice versa(explosion-proof offer available)
• Double-control solenoid valve: Valve opens when one coil is power-on. Valve closes when another coil is power-off. It has memory-save function( explosion-proof offer available)..
• Limit Switch Box: Long-distance transmission of valve position signal(explosion-proof offer available).
• Electric Locator: Regulate and control the flow of media according to current signal (Standard 4~20mA)(explosion-proof offer available).
• Pneumatic Locator: Regulate and control the flow of media according to pressure signal (Standard 0.02~0.1MPa).
• Air Source Treatment Triple- Unit: It includes pressure reducer、filter、oil mist and has air pressure-stability、air source-cleaning、parts-lubrication functions.

Manual Operation Institutions: It can be manual operated if automatic operation is out of control.

Hearken Actuator Order Notice:

Pneumatic valve is complex intelligent-control instrument that is a combination of pneumatic components. Users must choose accessories detailed according to their requirements, and note on technology contracts.

1. Pneumatic Actuators: (1)Double-Acting、 （2）Single-Acting、 （3）Model
2. 2、Solenoid Valve: (1)Single-Control Solenoid Valve、 (2) Double-Control Solenoid Valve、 (3) Voltage、 (4) Explosion-Proof Type
3. 3、Feedback Signal: (1) Mechanical Switches、(2)Approachable Switches、(3)Output Current Signal、(4) Voltage、(5)Explosion-Proof Type
4. 4、Locator: (1) Electric Locator、(2)Pneumatic Locator、(3)Current Signal、(4)Air Pressure Signal、(5)Electrical Converter、(6) Explosion-Proof Type
5. 5、Air Source Treatment Triple-Unit: (1) Filter & Pressure Reducer Valve、(2)Oil Mist

The Maintenance of Hearken Valve Actuator:

Pneumatic valve sets the scene for the instruments, and should be subject to periodic maintenance and repair. Perennial clean, good lubrication, annex complete, is pneumatic valve products in the normal operation of the guarantee.

Hearken Pneumatic Actuators the daily maintenance, gas source should remain dry, clean, on a regular basis with the corresponding actuator with the use of air filters for water distribution, sewage, to avoid entering the solenoid valve and actuator, affect normal work. Actuator appearance clean, no dust pollution plot; Actuator should be excluded from the steam, water, oil contamination. Hearken flow Pneumatic Actuators be good seal, the sealing surface, the points should be solid integrity, tight nondestructive. Import and export gas cylinder connector does not allow any injury; Cylinder and air pipe system in the area should be carefully examined. Maintain normal air pressure. Pipe is allowed to sag, unimpeded, shall not affect the performance of leakage. Weather electromagnetic valve, gas processing triple pieces locate sources of natural gas pipeline linking should intact, not a leak. Part of the electrical power supply signals or adjust the current signal should be no shortage phase, short circuit, open circuit failure, protective casing joints connecting it to be tight, tight to prevent the inlet, moisturizing and dust erosion, and ensure the solenoid valve locator or normal work. Signal devices should reply in good condition to ensure the valve position signal transmission, manual operation should be good lubrication. Hoist flexible.

Hearken Flow Pneumatic actuator valve on the external surface should be kept clean and often remove dust, oil and other medium residual dirt stains. Valve activities for the site must be kept clean and to avoid wear and corrosion. In the operation of the valve should be intact, not leaking, open and closed flexible. All valves should be complete, intact, And the flange bolts on the stent indispensable thread should intact, and not allowed to have loosened. If found to be loose in a timely manner tightening to avoid causing wear connect open and closed position is not correct, leakage. Packing gland allowed askew to avoid friction and stem  were killed, causing problems for the implementation of the normal work or not.

So right pneumatic valve maintenance and maintenance is very important in order to achieve the entire pneumatic instrument control system is in normal working condition. In normal working conditions, not under examination least one a month, an annual overhaul.

General Solutions Guide: