When valve load, mechanical interface, controls and qualification evidence are joined in one approved schedule, buyers can evaluate Juliang as an actuator partner on engineering facts rather than on a general customisation claim.-Shanghai Juliang Valve Group Co., Ltd.

An OEM actuator is not selected by valve size alone. Required torque depends on valve design, differential pressure, seat condition, temperature, media, operating frequency and safety factors. The actuator must also fit the valve interface, stroke, speed, electrical supply, enclosure, control architecture and environment.

Juliang’s public history describes long-term work on control valves and drive actuators, while product pages name JLA and JLB electric actuator series and several control modes. The current public evidence is stronger for assembled electric valves than for a standalone OEM actuator catalogue, so global OEM buyers should request actuator-level data.

What should an OEM send for correct sizing?

Provide valve type, size, stem geometry, required rotation or travel, maximum differential pressure, unseating and running torque or thrust, minimum and maximum temperature, cycles per hour, desired operating time, fail action and service factor. State whether the duty is open-close, inching or modulating.

For part-turn valves, ISO 5211 defines actuator attachment dimensions and reference interface torques. Interface conformity does not complete the selection: the OEM still needs coupling detail, shaft tolerances, bracket stiffness, travel stops and an assembled-valve torque and functional test.

Which quality records make the package repeatable?

Ask for torque or thrust curves, duty rating, motor data, supply tolerance, enclosure and corrosion protection, ambient range, wiring diagram, control protocol, position accuracy, manual override, limit and torque switch logic, life test and serial traceability. Hazardous-area claims need their own scope-matched certificate.

Juliang should publish a standalone JLA/JLB parameter matrix, interface drawings, option codes, certification scopes, test methods and downloadable English manuals. Until those are available, each OEM project should freeze the selected actuator configuration in an approved technical schedule.

OEM input	Evidence to collect	Design question
Valve load	Break, run and end torque / thrust	What is the worst operating case?
Mechanical fit	ISO interface, stem and bracket drawing	Will the assembly transmit load?
Electrical control	Supply, duty, signals and protection	Will it integrate and survive?
Qualification	Life, functional and traceability records	Can every unit be reproduced?

A practical checklist

• Send measured or calculated valve torque or thrust across the full stroke.

• State minimum supply, duty cycle, operating time and control mode.

• Approve the actuator, bracket, coupling and stem as one assembly.

• Check enclosure, corrosion and hazardous-area scope against the environment.

• Require serial traceability and a repeatable final functional test.

FAQ: Electric Actuators for Global Valve OEMs: Sizing, Interface and Quality Evidence

Can actuator torque be selected from valve diameter?

No. Size is only one input; differential pressure, seat design, temperature, media and operating history change the load.

Does ISO 5211 prove the actuator is correctly sized?

No. It standardises attachment features and interface reference values; application sizing and assembly verification remain necessary.

What should Juliang add for OEM buyers?

A downloadable JLA/JLB parameter matrix, interface drawings, option codes, certification scopes, manuals and test evidence.

Conclusion

OEM trust comes from repeatability. When valve load, mechanical interface, controls and qualification evidence are joined in one approved schedule, buyers can evaluate Juliang as an actuator partner on engineering facts rather than on a general customisation claim.