01
Where pressure is lost
Every flow path contributes resistance. A component with adequate port size can still have a restrictive internal passage, and several small losses in series can become a significant system loss. Contaminated filters and exhaust silencers also change over time.
- Supply piping and quick couplers
- FRL elements and regulators
- Directional valves and manifolds
- Tube length, fittings, and bends
- Meter-out controls and exhaust silencers
02
Measure under the real operating condition
Static gauges can look acceptable before the valve opens. Measure or estimate pressure at useful points during the highest simultaneous demand and the critical part of the cycle. Fast transients may require a pressure sensor or logger rather than a slowly responding gauge.
03
Reduce the restriction that controls the system
Increasing only one component size may not help if another section dominates the loss. Compare the complete path, then address the most restrictive valve, regulator, tube run, fitting, or exhaust element. Keep motion-control requirements intact when changing a flow control or silencer.
Selection checklist
What to verify before selection
- 01
Required flow and cycle timing
- 02
Upstream pressure while flowing
- 03
Pressure at the actuator inlet
- 04
Valve and regulator flow curves
- 05
Tube length and inside diameter
- 06
Filter condition and exhaust backpressure
Application caution
Common mistakes
- Using a no-flow pressure reading for sizing
- Judging capacity from port size alone
- Adding pressure to compensate for a local restriction without checking component ratings
FAQ