Q&A

The duty cycle refers to the ratio between running time and rest time, calculated as follows:
Duty Cycle (%) = Running Time / (Running Time + Rest Time) × 100%

The rest time can be determined using:
Rest Time  =  Running Time × ( 1 – Duty Cycle (%) )  / Duty Cycle (%)

Examples:
1. OM-2 110VAC/60 Hz ON-OFF 30% duty cycle

•       Running time: 17 s
•      Rest time calculation: 17 × (1 – 0.30) / 0.30 ≈ 40 s
•      Required rest time: 40 s to prevent over-duty operation

2. OM-2 110VAC/60 Hz ON-OFF 75% duty cycle
     Running time: 17 sec, 
     Rest time calculation: 17 × (1 – 0.75) / 0.75 ≈ 6 s
     Required rest time: 6 s to prevent over-duty operation
 

※ A cycle is the movement of the valve from the fully closed position to the fully open position and back to the fully closed position, or vice versa.

※ When operating at a higher duty than the standard, please select extended duty kit option to prevent overload.

The actuator shall be selected to ensure its torque output meets the valve's load requirements and can accommodate the required duty cycle of the application. As a minimum, a 30 % safety factor is recommended when calculating the torque requirement.

Example Calculation

• Maximum torque of a 5″ valve: 80 Nm
• Required torque with 30 % safety factor: 80 × 1.3 = 104 Nm
• Selection Check: 

              OM‑3: Rated torque 150 N·m → 104 Nm < 150 Nm → ✅ OK

              OM‑2: Rated torque 90 N·m → 104 Nm > 90 Nm → ❌ Not OK

• Mounting Considerations: If the actuator cannot be directly mounted to the valve, a suitable mounting kit is required. The bracket and coupling must be properly designed and manufactured to withstand the actuator's torque output.

Q: Why choose an electric valve actuator?

A: Electric valve actuators offer precise control, easy automation, and reliable performance. They are widely used in various industries for improving efficiency and safety.

Q: What is an electric valve actuator?

A: An electric valve actuator is a device that uses electricity to drive a valve. It receives an electrical signal and automatically adjusts the valve opening to control flow or energy.

Q: What are the main components of a motorized valve?

A: It consists of two main parts: the actuator and the valve (control mechanism).

Q: What are the protection ratings for electric valve actuators?

A:

• NEMA standards: NEMA 4X is recommended for non-hazardous environments, while NEMA 7 or 9 is required for hazardous locations.
• IEC/IP standards: IP67 is a common dust and water protection level for industrial applications.

Q: In which industries are electric valve actuators used?

A: They are widely used in industrial automation, irrigation, water treatment, HVAC, chemicals, food processing, mining, tunnel/metro ventilation, smoke extraction, and environmental systems.

Q: What are the common series of electric valve actuators?

A:

• Quarter-turn: OM series
• Spring return: S series
• Linear: L series
• Explosion-proof: OME series, SE series, LE series

A: We provide 8 main types of electric valve actuators:

1. OM series – Quarter-turn electric actuators
   Models: OM-1 to OM-13, BM-2, OM-A, OM-AM
   Torque range: 35 – 4500 Nm
   Feature: Clutch-less manual override (except BM-2 and OM-A).
2. S series – Spring return fail-safe electric actuators
   Models: S-500, S-1300, S-2000, S-2600, S-3600
   Torque range: 50 – 260 Nm
   Control: Standard open/close; floating and modulating optional.
3. L series – Linear electric actuators
   Models: L-250, L-500, L-1000, L-2000
   Thrust range: 250 – 2000 kgf
   Feature: Standard with modulating control, suitable for globe valves and other linear motion devices.
4. T series – Compact quarter-turn electric actuators
   Models: T-6, T-15
   Torque range: 6 – 15 Nm
   Feature: Compact design with NEMA 4X/5 enclosure and ISO 5211 mounting flange.
5. CM series – Part-turn electric actuators
   Models: CM-100 to CM-600
   Torque range: 100 – 600 Nm
   Application: Butterfly, plug, ball valves. Standard with on-off control, and modulating is optional.
6. OME series – Explosion-proof quarter-turn actuators
   Models: OME-1 to OME-8, OME-A, OME-AM
   Torque range: 35 Nm  to 1500 Nm
   Feature: Flame-proof & dust-proof. The directive and standard marking is II 2 GD Ex db IIB T4 Gb, Ex tb IIIC T130°C Db; manual override without clutch and brake, flame-proof & dust-proof.
7. SE series – Explosion-proof spring return fail-safe actuators
   Models: SE-500, SE-1300, SE-2000, SE-2600
   Feature: Flame-proof & dust-proof. The directive and standard marking is II 2 GD Ex db IIB T4 Gb, Ex tb IIIC T130°C Db; ensures fail-safe valve positioning on power loss.
8. LE series – Explosion-proof linear actuators
   Models: LE-250, LE-500, LE-1000, LE-2000
   Thrust range: 250 – 2000 kgf
   Feature: Flame-proof & dust-proof. The directive and standard marking is II 2 GD Ex db IIB T4 Gb, Ex tb IIIC T130°C Db ; equipped with modulating controllers; suitable for globe valves, gate valves, and linear travel devices.