Positioners play a crucial role in ensuring a pre-defined correlation between the input signal and the valve position. In other words, they facilitate the assignment of the controlled variable x to the reference variable w. This is achieved by comparing the input signal generated by the control system with the movement of the control valve.
The positioner then issues an output signal pressure pst, which corresponds to the movement of the valve. If the control system input and valve movement don't match up, the positioner will adjust the signal pressure until the desired valve position is achieved.
If the actuator is double-acting, the positioner will also make use of a reversing amplifier to generate two opposing signal pressures. This ensures that the valve can be moved both inwards and outwards.
The product has a range of mounting positions to suit different requirements and can be used for normal or split-range operations. It has an excellent dynamic response and minimal influence of supply air. The proportional band (P band) is adjustable, and the air output capacity can be adjusted to meet specific needs. The product also features low air supply consumption, making it an economical choice. Additionally, it is designed to be insensitive to mechanical vibrations, and its compact design is low maintenance.
This product is available in versions suitable for use in hazardous areas. These versions have type of protection intrinsic safety II 2G Ex ia IIC T6 or II 3G Ex nA II T6 for Zone 2.
For those who require flameproof protection, the product is available with type of protection Ex d, which includes the Type 3766 Positioner and the Type 6116 i/p Converter as shown in Figure 2.
The product can be directly attached to the Type 3277 Actuator, as illustrated in Figure 3, or it can be attached to actuators in accordance with IEC 60534-6. For those using rotary actuators, attachment is possible according to VDI/VDE 3845.
Product name: | Samson 3767 |
Product: | Electropneumatic Positioner |
Acting: | Single Acting Or Double Acting |
Control loop: | 4 To 20 MA |
Communication: | Without |
Diagnostics: | Without |
Material: | Aluminum |
Customized support: | OEM |
Usage: | Challenging Transit Times And Ambient Conditions |
Warranty: | 1 Year |
Positioners for pneumatic control valves are available in both single-acting and double-acting versions. These devices are designed to be attached to the control valves to assist in the accurate and reliable positioning of the valve.
The single-acting positioners use air pressure to move the valve to the desired position. When the input signal is removed, a spring returns the valve to its original position. On the other hand, double-acting positioners use air pressure to move the valve in both directions. This allows for greater control and precision in positioning the valve.
Both types of positioners are commonly used in industrial settings where precise control of process parameters is essential. They are particularly useful in situations where a high degree of accuracy is required or where the process is continually changing. In these cases, the positioners help to ensure that the control valve is always in the correct position to maintain optimal process conditions.
Overall, positioners are an important component of pneumatic control systems and play a critical role in maintaining system performance and reliability. Whether you opt for a single-acting or double-acting positioner will depend on the specific needs of your application.
Product Packaging for Control Valve Positioner:
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