smart valve positioner single acting angular stroke with position
feedback mounting bracket
Product Overview
The TORLEO TOP-5879F1-C41-11-RSP-21BYA1 is a pneumatic
(electro-pneumatic) single-acting smart valve positioner for rotary
(0–120°) spring-return valves. It converts a
4–20 mA control signal into precise valve positioning and
drives a single controlled output port, relying on the
actuator’s return spring for the reverse stroke. A
non-contact position sensor and adjustable exhaust damping
eliminate the wear of continuous rotation and prevent ball/disc
fluttering under high differential pressure, while the
microprocessor PID loop holds ±0.3% F.S. repeatability,
linearity and hysteresis. Explosion protection: Ex db IIC T6 Gb;
safety integrity: SIL 3; enclosure: IP66. On loss of air, signal or
power the spring returns the valve to its fail-safe position.
Configured with position feedback output.
Model: TOP-5879F1-C41-11-RSP-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 | 0~120º |
| 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 | Not explosion-proof |
| 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
Sub-category: Rotary Single-Acting (pneumatic). With a rotary travel of 0–120° and a single controlled output
port, it couples directly to rotary spring-return (single-acting)
pneumatic actuators on ball valves (floating / trunnion), butterfly
valves, V-port ball valves and plug valves. Linear
(straight-stroke) globe/gate valves require the corresponding
Linear pneumatic positioner.
- ball valves (floating / trunnion) — rotary spring-return
(single-acting) pneumatic actuators
- butterfly valves — rotary spring-return (single-acting) pneumatic
actuators
- V-port ball valves and plug valves — rotary spring-return
(single-acting) pneumatic actuators
Field Engineering Notes
Real-world field experience — A pneumatic positioner lives or dies
by the quality of its instrument air, and on real plants that air
is rarely ideal: it carries water and oil carry-over, fine sand and
dust, and can freeze or clog a conventional mechanism. Our
engineers found the three most common field failures are (1)
air-line contamination clogging the internal orifice / relay, (2)
uneven spring stiffness and mechanical hysteresis in spring-return
actuators, and (3) micro-fluttering of the ball/disc under high
differential pressure. TORLEO counters these at the design level,
not in the brochure: the wear-free nozzle-baffle + symmetrical-diaphragm structure is resistant to dust, moisture and oil and does not
clog; the built-in microprocessor runs a PID algorithm with
0.1–0.3% accuracy and compensates stiction dead-band; adjustable
exhaust damping stops fluttering; and the return spring drives the
valve to its fail-safe position on loss of air, signal or power.
Why Choose TORLEO
- Nozzle-baffle + symmetrical-diaphragm structure resists
contaminated air (water, oil, sand, dust) — it does not clog
- Single-acting spring-return action with adjustable exhaust damping
to prevent fluttering
- Rotary 0–120° with non-contact position sensing (no mechanical
wear)
- ±0.3% F.S. repeatability, linearity and hysteresis; PID control for
0.1–0.3% accuracy
- Pneumatic supply 1.4–6 bar, oil-free / moisture-free / dust-free;
fail-safe on loss of air, signal or power
- Explosion-proof options (Ex db IIC T6 Gb / Ex ia IIC T4 Ga) and SIL
3; IP66 enclosure
Certifications & Compliance
All TORLEO units are manufactured under a certified quality
management system. Trust anchors: Functional safety — IEC 61508 SIL 3; Explosion protection — Ex db IIC T6 Gb; Ingress protection — IP66. Representative certificates are shown below.
IEC 61508 SIL 3Ex db IIC T6 GbIP66PneumaticSingle-Acting
smart valve positioner single acting angular stroke with position
feedback mounting bracket
Product Overview
The TORLEO TOP-5879F1-C41-11-RSP-21BYA1 is a pneumatic
(electro-pneumatic) single-acting smart valve positioner for rotary
(0–120°) spring-return valves. It converts a
4–20 mA control signal into precise valve positioning and
drives a single controlled output port, relying on the
actuator’s return spring for the reverse stroke. A
non-contact position sensor and adjustable exhaust damping
eliminate the wear of continuous rotation and prevent ball/disc
fluttering under high differential pressure, while the
microprocessor PID loop holds ±0.3% F.S. repeatability,
linearity and hysteresis. Explosion protection: Ex db IIC T6 Gb;
safety integrity: SIL 3; enclosure: IP66. On loss of air, signal or
power the spring returns the valve to its fail-safe position.
Configured with position feedback output.
Model: TOP-5879F1-C41-11-RSP-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 | 0~120º |
| 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 | Not explosion-proof |
| 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
Sub-category: Rotary Single-Acting (pneumatic). With a rotary travel of 0–120° and a single controlled output
port, it couples directly to rotary spring-return (single-acting)
pneumatic actuators on ball valves (floating / trunnion), butterfly
valves, V-port ball valves and plug valves. Linear
(straight-stroke) globe/gate valves require the corresponding
Linear pneumatic positioner.
- ball valves (floating / trunnion) — rotary spring-return
(single-acting) pneumatic actuators
- butterfly valves — rotary spring-return (single-acting) pneumatic
actuators
- V-port ball valves and plug valves — rotary spring-return
(single-acting) pneumatic actuators
Field Engineering Notes
Real-world field experience — A pneumatic positioner lives or dies
by the quality of its instrument air, and on real plants that air
is rarely ideal: it carries water and oil carry-over, fine sand and
dust, and can freeze or clog a conventional mechanism. Our
engineers found the three most common field failures are (1)
air-line contamination clogging the internal orifice / relay, (2)
uneven spring stiffness and mechanical hysteresis in spring-return
actuators, and (3) micro-fluttering of the ball/disc under high
differential pressure. TORLEO counters these at the design level,
not in the brochure: the wear-free nozzle-baffle + symmetrical-diaphragm structure is resistant to dust, moisture and oil and does not
clog; the built-in microprocessor runs a PID algorithm with
0.1–0.3% accuracy and compensates stiction dead-band; adjustable
exhaust damping stops fluttering; and the return spring drives the
valve to its fail-safe position on loss of air, signal or power.
Why Choose TORLEO
- Nozzle-baffle + symmetrical-diaphragm structure resists
contaminated air (water, oil, sand, dust) — it does not clog
- Single-acting spring-return action with adjustable exhaust damping
to prevent fluttering
- Rotary 0–120° with non-contact position sensing (no mechanical
wear)
- ±0.3% F.S. repeatability, linearity and hysteresis; PID control for
0.1–0.3% accuracy
- Pneumatic supply 1.4–6 bar, oil-free / moisture-free / dust-free;
fail-safe on loss of air, signal or power
- Explosion-proof options (Ex db IIC T6 Gb / Ex ia IIC T4 Ga) and SIL
3; IP66 enclosure
Certifications & Compliance
All TORLEO units are manufactured under a certified quality
management system. Trust anchors: Functional safety — IEC 61508 SIL 3; Explosion protection — Ex db IIC T6 Gb; Ingress protection — IP66. Representative certificates are shown below.
IEC 61508 SIL 3Ex db IIC T6 GbIP66PneumaticSingle-Acting
