GRPO-160-1/8-AL

What does this precision flow regulator (throttle valve) do?

It provides fine, adjustable restriction of compressed-air flow in a pneumatic line. It is commonly used to set actuator speeds (such as cylinder extend/retract) by metering airflow through the valve.

Is this used for flow control or pressure regulation?

It is for flow control (throttling), not pressure regulation. It limits the volume flow rate through an adjustable orifice; it does not maintain a constant downstream pressure like a pressure regulator.

What connection size does it have?

It has 1/8-inch ports (commonly supplied as G 1/8 BSPP on European pneumatic equipment). If you are matching to existing pipework, confirm whether your installation uses BSPP (G) or another thread standard before ordering fittings.

Does it control flow in one direction or both directions?

As a throttle valve, it is typically used to meter flow in both directions. If you need free flow in one direction and restricted flow in the other, you would normally use a one-way flow control solution (throttle with a check function) instead.

Where is it typically installed in a pneumatic circuit?

It is usually installed in-line between the air supply/valve manifold and the actuator, or directly near the actuator port. Positioning close to the actuator often improves repeatability when setting speeds.

How is the flow setting adjusted?

The flow is adjusted by turning the needle/screw adjustment to increase or decrease the restriction. For best results, set the actuator to run under normal load and adjust gradually until the required speed is reached.

What media is it suitable for?

It is intended for pneumatic applications, most commonly compressed air. As with any throttling component, ensure the media is compatible with the seals and internal materials used in the valve.

What is the benefit of using a precision throttle valve instead of a basic restrictor?

A precision throttle valve is designed for finer, more repeatable adjustment, making it easier to dial in stable actuator speeds—especially in applications where small changes in flow make a noticeable difference.

What does the “AL” designation indicate?

In Festo naming, “AL” is commonly used to denote an aluminium-bodied variant. If you are matching an existing installation, this can be helpful when consistency of materials or weight is important.

Can it be used to stabilise cylinder speed if the load changes?

It can help you set a target speed under typical operating conditions, but it does not actively compensate for load or supply-pressure fluctuations. If you need tighter speed stability, consider circuit approaches that reduce load sensitivity (for example, metering-out control) and ensure supply pressure is stable.

How do I choose the correct fitting style for installation?

Start by confirming the thread standard and sealing method used on your machine (for example, parallel thread with a sealing washer versus taper thread sealing). Then select fittings that match the 1/8 port size and your tubing diameter, ensuring the sealing approach matches your existing system.

Is it suitable for fine, low-flow adjustments?

Yes—this type of valve is intended for precise metering. If you are working at very low flows, take care to adjust in small increments and verify performance at normal operating pressure and temperature. The GRPO-160-1/8-AL is commonly chosen when repeatable fine adjustment is required.