PTIC

KVA Thailand ยท Air Motor Operated Valve

KVA Air Motor Actuator

High output torque from a compact body, driven by plant air, with no electrical equipment at the valve itself.

Ask about KVA
Working principle

An air motor turning a gear train

Instead of a spring or piston chamber, an air motor drives a gear train. The result is high output torque from a compact body, with no electrical drive at the valve — useful in hazardous areas and on large valves where a cylinder would be impractical.

  • Rack & pinion and scotch yoke arrangements
  • Fail-safe spring return available
  • High output torque, compact envelope
  • No electrical equipment at the valve
  • Tolerant of harsh plant conditions
KVA air motor operated actuator mounted on a flanged ball valve

Air motor operated valve

KVA

High output torque from plant air, with no electrical drive at the valve itself.

  • Rack & pinion / scotch yoke
  • Fail-safe spring return
  • High torque, compact body
  • Suited to hazardous areas
Electric or air motor?

Choosing between the two

There is no universally better option. The plant decides.

Choose electric when

A
  • No reliable instrument air at the valve
  • Precise modulating control is needed
  • Positioning feedback and diagnostics matter
  • Air consumption is a running cost concern
See Ontrac

Choose air motor when

B
  • Instrument air is already available
  • Hazardous area limits electrical equipment
  • Very high torque is required
  • A defined fail position on air loss is required
Talk it through
Sizing data

What we need before quoting an air motor actuator

Send whatever you have. Missing items are the usual reason an actuator arrives undersized.

Valve

01
  • Type, size and pressure class
  • Break-to-open and running torque
  • Stem size and mounting flange

Air supply

02
  • Available pressure at the valve
  • Air quality and lubrication
  • Line size and distance from the header

Duty

03
  • On-off or modulating
  • Required stroke time
  • Operating frequency per hour

Site & safety

04
  • Hazardous area classification
  • Fail position on air loss
  • Ambient temperature and washdown

Not sure which one your line needs?

Tell us the valve and the duty. We will give you a straight recommendation.

Talk to an engineer