Buy Flow Control Online in Australia
Flow Control Valve Selection — Quick Reference
Flow control valves REGULATE rate of fluid flow — allowing speed of cylinders + motors + actuators to be SET + MAINTAINED at target. Critical for hydraulic + pneumatic + process applications requiring controlled motion.
| Flow Control Type | Best For |
|---|---|
| Needle Valve (Manual) | Precise flow setting + low-flow |
| Pressure-Compensated Flow Control | Constant flow regardless of pressure |
| Throttle Valve (Bi-Directional) | Speed control both directions |
| Meter-In Flow Control | Restricting flow INTO actuator |
| Meter-Out Flow Control | Restricting flow OUT of actuator — preferred for vertical loads |
| Globe Valve (Throttling) | Throttling — see globe valves |
| Hand-Adjustable vs Sealed | Operator adjust vs sealed-set |
Critical: Match valve to MEDIA + PRESSURE + FLOW. Meter-OUT preferred on vertical actuators (load won't fall if hose bursts upstream). Brands: Dixon, Parker. Companion: valves, needle valves, hydraulics, pneumatics.
Flow Control
Flow control valves regulate the rate of fluid flow through a circuit, allowing the speed of cylinders, motors, and actuators to be set and maintained at the desired level. Without flow control, pneumatic and hydraulic actuators would move at maximum speed — uncontrolled movement that wastes energy, causes shock loads on machine structures, and creates safety risks in machinery. Properly configured flow control is the basis of controlled, repeatable machine motion. AIMS Industrial supplies flow control valves and regulators for pneumatic and hydraulic system applications.
Pneumatic Flow Control
In pneumatic systems, flow control valves are typically fitted in the cylinder supply or exhaust lines to regulate piston speed. Meter-in control (restricting the supply air to the cylinder) is used for resistive loads. Meter-out control (restricting the exhaust air from the cylinder) is the preferred arrangement for most applications — it provides smoother, more consistent speed control as the back-pressure stabilises the piston movement against load variations.
Inline flow control valves and push-in flow restrictors (fitting-mounted needle valves with integral push-in port) are the two most common forms. Push-in flow controls mount directly on the cylinder port for the most compact installation; inline valves are placed in the circuit where they are most accessible for adjustment during commissioning and maintenance.
Hydraulic Flow Control
Hydraulic flow control valves are more complex than pneumatic equivalents — they must handle higher pressures, higher flow rates, and the temperature and contamination challenges of hydraulic fluid. Compensated flow control valves maintain a constant output flow rate despite variations in inlet pressure and load — essential for applications where actuator speed must remain constant regardless of changing resistance. Uncompensated throttle valves are simpler and less expensive but do not maintain constant flow as pressure varies.
Needle Valves
Needle valves provide fine, precise flow adjustment through a tapered needle that gradually opens or closes a small orifice as the valve is turned. They are used for low-flow applications requiring very precise setting — instrument air supplies, lubrication metering, and chemical dosing. The fine thread gives good resolution of the flow setting over many turns of the adjustment stem. For flow control valve selection and sizing for your system, contact our team.
Selection and Sizing
Flow control valve selection requires matching the port size and flow coefficient (Cv or Kv) to the required flow rate and operating pressure. An undersized flow control valve restricts flow below the desired rate even at full open; an oversized valve has too little adjustment range for fine speed setting at the required flow. AIMS Industrial stocks pneumatic and hydraulic flow control valves in standard port sizes for Australian industrial and OEM equipment applications.
People Also Ask — Flow Control
Q: Why is meter-out flow control preferred over meter-in for vertical loads?
Meter-out control restricts the exhaust flow leaving the actuator rather than the supply flow entering it, which provides smoother and more consistent speed control as back-pressure stabilises the piston against load variations. On vertical actuators specifically, meter-out is preferred because the load won't fall if a hose bursts upstream of the actuator.
Q: What's the difference between a compensated and uncompensated flow control valve?
A pressure-compensated flow control valve maintains a constant output flow rate despite variations in inlet pressure and load, which is essential where actuator speed must stay constant regardless of changing resistance. Uncompensated throttle valves are simpler and less expensive but don't maintain constant flow as pressure varies.
Q: What's a needle valve used for in flow control?
A needle valve provides fine, precise flow adjustment through a tapered needle that gradually opens or closes a small orifice as it's turned. It's used for low-flow applications requiring very precise setting, such as instrument air supplies, lubrication metering, and chemical dosing.
Q: How do I size a flow control valve correctly?
Sizing requires matching the port size and flow coefficient (Cv or Kv) to the required flow rate and operating pressure. An undersized valve restricts flow below the desired rate even when fully open, while an oversized valve has too little adjustment range for fine speed setting at the required flow.
Q: What's the difference between an inline flow control valve and a push-in flow restrictor?
A push-in flow restrictor is a fitting-mounted needle valve with an integral push-in port that mounts directly on the cylinder port for the most compact installation. An inline valve is placed elsewhere in the circuit where it's more accessible for adjustment during commissioning and maintenance.