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Analysis of the Performance Characteristics of Valve Positioners
Release time:
2026-04-07 15:22
The introduction of valve positioners has provided advanced tools for digital communication among field actuators and for plant-wide integrated management. The TZID/TZID-C breaks with the traditional concept of positioners by employing TEIP11 as its core component, integrating microprocessor technology, and incorporating built-in communication capabilities.
Valve positioners have the following characteristics:
1. The standard configuration includes a custom-designed enclosure that effectively shields against interfering signals.
2. A unique patented technology—the three-cut protection function—ensures that the device remains in its current position in the event of power failure, signal loss, or gas supply interruption, eliminating the need for external solenoid valves and power-failure comparators. This feature offers three key advantages:
A. After position-holding, when resuming operation, the device directly resumes from the position it was in before the three-way switch was opened; other brands, however, first return to the safe position and then restart operation.
B. It can act immediately upon power loss, whereas other brands that rely on solenoid valves and power-loss comparators will experience a certain delay, causing the valve to continue moving one position.
C. Other brands achieve this function through solenoid valves and de-energization comparators; however, when power is lost, both of these components may also lose power, thereby failing to provide position-holding functionality.
3. Regarding air consumption and static air draw: the greater the intake flow, the more stable the valve control; the lower the static air draw, the greater the energy savings. Valve positioners combine the dual advantages of low static air draw and high dynamic intake flow.
4. The IP converter in the positioner employs the nozzle-flapper principle, whereas Siemens uses the piezoelectric valve principle. A drawback of the piezoelectric valve principle is that when the positioner remains at a fixed position for an extended period and then suddenly switches to another state, it may fail to respond promptly. In contrast, the nozzle-flapper type can provide synchronous response.
2020-01-19
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