Festo HGL-1/8-QS-6 | G1/8 Meter-In Flow Control Valve, 6mm Tube
Festo HGL-1/8-QS-6 one-way flow control valve (meter-in). G1/8 female port, QS-6 push-in for Ø6mm tube, needle adj., free reverse flow, for supply-side speed control on pneumatic cylinders.
Product Overview
The Festo HGL-1/8-QS-6 is a one-way flow control valve (meter-in type) from the HGL series, used to regulate the supply (pressurizing) flow to a double-acting pneumatic cylinder to control advance or retract speed. It features a G1/8" female threaded port for inline installation and a QS-6 push-in connector for 6 mm outside-diameter PU/nylon tubing. The valve allows full free-flow in the reverse direction and adjustable throttling in the metered direction via a knurled knob with lock nut.
Technical Specifications (Pneumatic & Performance)
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Parameter
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Specification
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Model / Order Code
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HGL-1/8-QS-6
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Function
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One-Way Flow Control Valve (Meter-In / Supply Throttle)
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Port Size (Threaded End)
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G1/8" (BSP Parallel Female)
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Tube Connection (Push-In End)
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QS-6 — accepts Ø6 mm Pneumatic Tubing (PU / Nylon)
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Flow Adjustment
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Needle Type, continuously variable
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Free-Flow Direction
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From Push-In → Threaded Port (full open, no restriction)
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Metered Direction
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Threaded Port → Push-In (adjustable restriction)
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Operating Pressure
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0.2 … 10 bar
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Operating Medium
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Compressed Air (lubricated or non-lubricated per ISO 8573-1)
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Flow Rate (Typical Qₘₐₓ)
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~250–400 L/min (depending on setting — reference: Festo data sheet)
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Technical Specifications (Mechanical & Environmental)
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Parameter
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Specification
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Mounting Style
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Inline — screws onto cylinder port, manifold, or tee; tube pushes in opposite end
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Body / Knob Material
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Nickel-plated Brass / PBT (Plastic Knob)
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Seal Material
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NBR (Standard)
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Ambient Temperature
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-10 … +60 °C
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Positive Locking Nut
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Yes — prevents inadvertent setting change from vibration
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Conforms to
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DIN / ISO Pneumatic Symbol (One-Way Throttle)
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Weight (Approx.)
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~45 g
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Key Features
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Meter-In (Supply) Throttle: Installed on the cylinder supply port — regulates how fast air fills the cylinder chamber. Note: for best double-acting cylinder control, meter-out (exhaust throttle — LRLL series) is generally preferred to avoid stick-slip; meter-in is used when exhaust is open or for single-acting cylinders.
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Push-In Tube Release: Quick-connect/disconnect for Ø6 mm tubing — simply push tube in; lift collet to remove. No tools for tubing.
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Lockable Adjustment: Knurled knob with integrated lock nut secures the flow setting against vibration.
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Free-Flow Check: Unrestricted reverse flow ensures no back-pressure builds when air is exhausting from the metered side.
Applications
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Single-Acting Cylinder Speed: Controlling extend speed of spring-return cylinders (only one direction needs throttling).
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Supply-Side Regulation: Where process dictates meter-in (e.g., soft-start or when exhaust is separately metered).
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Air Motor / Tool Feed: Regulating supply air to air motors, vacuum generators, or blow guns.
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Retrofit / OEM: Direct screw-in on G1/8 cylinder ports or manifold branches with Ø6 mm supply tubing.
Note: For meter-out (exhaust throttling — recommended for double-acting cylinders), use the LRLL-1/8-QS-6 (same G1/8 + QS-6 but opposite flow direction). For other tube sizes: QS-4 (Ø4 mm), QS-8 (Ø8 mm), QS-10 (Ø10 mm) are also available in the HGL-1/8-QS-x family. Always confirm application requirement — meter-out usually gives smoother motion on double-acting cylinders.
About ACH
Founded in 2012, ACH is a top-tier distributor of industrial automation products, supplying genuine devices from leading brands like ABB, P+F, E&H, AB, MTL to emerging markets worldwide. Our mission is to provide 100% Genuine products at the most competitive prices, helping customers reduce costs and strengthen their market position.
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Frequently Ask & Questions
Are preferential prices available?
Long-term brand partners can get competitive product prices. At the same time, ACH controls the profit per order to 5%, providing the most competitive prices.
Are the Products Genuine OEM Units?
Yes, all products from ACH are certified genuine OEM units. We acquire our inventory through official OEM channels and trusted third-party suppliers, ensuring every item is authentic and reliable.
How will you arrange shipment?
We'll handle the shipping for you. Through our partnerships, we can secure competitive rates with major carriers like FedEx, DHL, TNT, and UPS, ensuring a smooth and cost-effective delivery.
What is the warranty of goods?
One-year Warranty.
How long is the logistics cycle of the product?
Products are divided into spot and futures, and the delivery period of different brands of products is also different. For details, please contact the ACH business manager.
