Angular Stroke Smart Digital Valve Positioner Single Acting With Mounting Bracket
TOP-5879F1-C41-11-RDP-21BYA1 — Rotary Double-Acting Digital Series
Product Overview
The TORLEO TOP-5879F1-C41-11-RDP-21BYA1 is a digital (smart) valve positioner of the Rotary Double-Acting Digital Series, a rotary (quarter-turn) digital positioner for ball valves and other 0–120° rotary actuators, in a die-cast aluminum housing. A microprocessor (CPU) runs a PID predictive closed-loop control: it compares the 4–20 mA set-point with the feedback and drives the pilot stage to balance the two output ports (OUT1 & OUT2) of the double-acting actuator. When the valve is at rest the CPU fully closes the pilot air path, so the steady-state air consumption ≤ 0.056 Nm³/h — near zero. Its feedback spindle rotates 0–90° / 0–120° and is read by a microprocessor-based non-contact, high-resolution magnetic sensor, with no mechanical linkage wear or signal jump. Enclosure IP66; explosion protection Non-explosion-proof (standard); functional safety IEC 61508 SIL 3.
Digital Closed-Loop Control & Low Air Consumption
When we serve global process-industry customers, and from our recent project data, a digital positioner’s value lies in its processor. Unlike an old force-balance analog positioner, a digital unit uses a microprocessor (CPU) to run an advanced closed-loop PID predictive control: it compares the 4–20 mA set-point with the non-contact feedback, then drives the pilot stage to balance the two output ports (OUT1 & OUT2) of the double-acting actuator. At steady state the CPU shuts the pilot air path completely, so the steady-state air consumption falls to ≤ 0.056 Nm³/h — near zero — instead of the continuous bleed of a force-balance unit, directly cutting the plant’s compressed-air network running cost. In the field our engineers: (1) run one-touch auto-tuning from the handheld communicator or the built-in panel for an immediate calibration; (2) read online diagnostics straight from the unit — valve opening %, friction change and stroke cycle counter; and (3) on very long bus runs, use the algorithm to compensate the pneumatic lag so the valve does not lag the set-point.
Product Family Matrix (Linear / Rotary * Single / Double-Acting)
- Linear Single-Acting Digital Series — pneumatic diaphragm / straight-through globe valves, travel 10–150 mm
- Linear Double-Acting Digital Series — high-thrust pneumatic piston cylinders, travel 10–150 mm
- Rotary Single-Acting Digital Series — spring-return ball / butterfly valves, 0–120°
- Rotary Double-Acting Digital Series — high-torque double-acting ball / butterfly valves, 0–120° ◀ this series
Semantic isolation: a quarter-turn unit (0–120° feedback) is a different mechanical family from a straight-stroke positioner (10–150 mm). Every product here is Rotary Double-Acting Digital and must not be listed as compatible with linear globe or diaphragm valves, just as a linear digital positioner must never be paired with a ball or butterfly valve.
Model: TOP-5879F1-11-RDP-21BYA1
| Item |
Indicator |
| Input signal |
4~20mA |
| Sensor type |
N/A |
| Gas source |
pressure 1.4~6bar; no oil, no moisture, no dust and dirt |
| Stroke / Travel |
0~120° |
| Input resistance |
490 Ω (max.) / 20 mA DC |
| Electrical interface |
NPT1/2 or G1/2 or custom |
| Pneumatic interface |
NPT1/4 |
| Repeatability |
±0.3%F.S. |
| Linear |
±0.3%F.S. |
| Hysteresis |
±0.3%F.S |
| Sensitivity |
±0.2%F.S |
| Output characteristics |
linear, quick opening (25:1, 50:1), equal percentage (1:25, 1:50) |
| Protection class |
IP66 |
| Explosion-proof grade |
Non-explosion-proof (standard) |
| Security level |
SIL3 |
| Fault state |
failsafe
Off power, off signal, off gas, the valve is in the initial state
|
| Operating temperature |
-30℃~70℃ |
| Material |
die-cast aluminum |
| Gross weight |
2Kg |
| Dimensions |
240L*80W*110H (mm) |
Recommended Applications & Valve Matching
Technical matrix: Rotary Double-Acting Digital Series. This page covers angular-stroke (rotary) positioners only, with 0–90° / 0–120° feedback. A straight-stroke positioner (10–150 mm) cannot be fitted to a rotating ball or butterfly valve without a special mechanical conversion, so this category contains no straight-stroke or linear diaphragm-valve pairings.
- double-acting ball valves (floating and trunnion-mounted)
- double-acting butterfly valves (concentric / offset)
- V-port / segmented ball valves
- plug and eccentric rotary valves
- damper / louver air valves
Field Engineering Notes
On site we commission the loop in three steps: verify the 4–20 mA at the terminals, confirm a dry, oil-free air supply at 1.4–6 bar, then run a one-touch auto-tune and check linearity across 0–120°. We trend the online data (opening %, friction, stroke cycle count) to track valve health, and on long bus runs we tune the control algorithm to overcome pneumatic lag. With a vibration-resistant terminal block and non-contact magnetic feedback, the unit keeps its zero and span, and stays at ≤ 0.056 Nm³/h when the valve is at rest.
Why Choose TORLEO
- Microprocessor (CPU) PID predictive closed-loop control — not an old force-balance analog design
- Near-zero steady-state air consumption (steady-state air consumption ≤ 0.056 Nm³/h) — cuts the plant compressed-air running cost
- One-touch auto-tuning from handheld communicator or built-in panel
- Online diagnostics: valve opening %%, friction change and stroke cycle counter
- Algorithmic compensation of pneumatic lag on very long bus runs
- IEC 61508 SIL 3; Non-explosion-proof (standard); IP66
Certifications & Compliance
Trust anchors for the whole family: functional safety — IEC 61508 SIL 3, certified by TÜV NORD; explosion protection — Ex ia IIC T4 Ga (intrinsically safe) / Ex d IIC T6 Gb (flameproof); ingress protection — IP66; energy efficiency — steady-state air consumption ≤ 0.056 Nm³/h.
IEC 61508 SIL 3 (TÜV NORD)Ex ia IIC T4 GaEx d IIC T6 GbIP66Air ≤ 0.056 Nm3/hDigital (Microprocessor)Rotary Double-Acting Digital Series
