AS2201F-01-04S: Elbow-Type Speed Controller, Your Precision Flow Control Expert for Meter-Out Applications
2026-02-25
Product Positioning
The AS2201F-01-04S is an elbow-type speed control valve with a one-touch fitting from SMC’s AS Series. Utilizing a meter-out control method, it integrates a precision needle valve and a quick-fit coupling into a single unit. Designed specifically to provide accurate and stable speed regulation for pneumatic actuators like cylinders, it is a core pneumatic accessory for achieving smooth motion control and enhancing operational performance in automated machinery.
Core Highlights: Meter-Out Control for Precision and Stability
Meter-Out Control for Smooth Motion
Employing a meter-out (exhaust flow control) method, this valve regulates actuator speed by controlling the airflow from the exhaust port. This approach effectively absorbs load fluctuations, ensuring smoother, more stable motion with higher resistance to disturbances. It is particularly suitable for applications demanding high motion stability.
Elbow Type for Flexible Installation
The elbow-type design features a 90-degree angle between the tube connection and the thread axis. This configuration is ideal for installations in confined spaces or where tubing direction needs to be changed, saving valuable space in the layout.
Pre-applied Sealant for Instant Installation
The suffix “S” indicates the product comes with pre-applied sealant on the threads. This eliminates the need for wrapping sealing tape or applying liquid sealant during installation. Simply screw it in for a reliable seal, significantly improving assembly efficiency and sealing reliability.
One-Touch Fitting for Easy Piping Connection
The tube port features a one-touch fitting design. Simply push the tube in to connect, and press the release collar to disconnect. This makes installation and maintenance extremely quick and easy, drastically reducing assembly time.
Precision Needle Valve for Wide Adjustability
Equipped with a built-in precision needle valve, it allows for stepless, precise adjustment of the flow passage area via a knurled knob. This enables accurate control across a wide range, from minute flows to larger flow rates.
It offers excellent flow characteristics with a Cv (sonic conductance) value of 0.5 dm³/(s·bar). At 0.5 MPa, the flow rate reaches approximately 180 L/min, meeting the speed control requirements of most small to medium-sized cylinders.
Robust and Widely Applicable
The main body is made of PBT resin, and the threaded section is available in either brass with electroless nickel plating or stainless steel, offering both light weight and corrosion resistance.
With an operating pressure range of 0.1 to 1.0 MPa and an operating temperature range of -5 to 60°C, it is compatible with various tubing materials such as nylon, soft nylon, and polyurethane, making it suitable for most general industrial environments.
Model Number Decoding
| Code | Meaning | Description |
|---|---|---|
| AS | Series Code | SMC AS Series Speed Controller |
| 2 | Body Size | Based on 1/8, 1/4 basis (Medium flow specification) |
| 2 | Type | Elbow Type |
| 0 | Control Method | Meter-Out (Exhaust Flow Control) |
| 1F | – | Series细分标识 |
| -01 | Connection Thread Size | R 1/8 (1/8-inch tapered thread) |
| -04 | Applicable Tube O.D. | Φ4 mm (Metric 4mm tube) |
| S | Option | With Sealant (pre-applied on threads) |
Specifications Overview
| Parameter | Specification | Source |
|---|---|---|
| Model | AS2201F-01-04S | |
| Series | AS | |
| Type | Speed Controller / w. One-Touch Fitting / Elbow Type | |
| Control Method | Meter-Out (Exhaust Flow Control) | |
| Connection Thread Size | R 1/8 (Tapered Thread) | |
| Applicable Tube O.D. | Φ4 mm | |
| Sealant | Pre-applied (S), no additional sealant required | |
| Working Fluid | Air | |
| Operating Pressure Range | 0.1 to 1.0 MPa | |
| Proof Pressure | 1.5 MPa | |
| Ambient / Fluid Temperature | -5 to 60°C (No freezing) | |
| Suitable Tubing Material | Nylon, Soft Nylon, Polyurethane | |
| Flow Characteristics (Sonic Conductance C) | 0.5 dm³/(s·bar) | |
| Flow Characteristics (Critical Pressure Ratio b) | 0.25 | |
| Reference Flow Rate (at 0.5MPa) | Approx. 180 L/min | |
| Lock Nut Form | Hexagon Lock Nut | |
| Body Material | PBT (Polybutylene Terephthalate) | |
| Weight | Approx. 0.018 kg (18g) |
Meter-Out vs. Meter-In Control
| Characteristic | Meter-Out (AS2201F-01-04S) | Meter-In |
|---|---|---|
| Control Principle | Regulates flow from the actuator’s exhaust port | Regulates flow into the actuator’s inlet port |
| Motion Stability | Superior, effectively absorbs load changes, high disturbance rejection | Prone to instability or chatter under varying loads |
| Typical Application | Most cylinder speed control, especially where smooth motion is critical | Single-acting cylinders, thrust control applications |
| Identification | Lock nut is typically zinc-plated (or electroless nickel-plated round nut) | Lock nut is typically black (chromate-treated) |
Application Scenarios
- Cylinder Speed Control: Installed directly on cylinder exhaust (or inlet) ports to precisely control extension/retraction speeds for smooth motion.
- Pneumatic Grippers: Adjusts clamping speed to prevent impact damage to workpieces.
- Automated Assembly Lines: Controls the speed and smoothness of transfer, pressing, and lifting operations.
- Packaging Machinery: Regulates the speed of cylinder-driven cutters, pushers, and sealing actions.
- Electronics & Medical Equipment: Fine flow control in compact pneumatic systems.
Summary: The Precision Flow Control Expert
The AS2201F-01-04S speed controller leverages its core technological advantage—the meter-out control method—to provide cylinders and other actuators with smooth, controllable, and disturbance-resistant speed regulation. Its elbow-type design saves space, the one-touch fitting simplifies tubing connections, and the pre-applied sealant ensures quick and reliable installation. Choosing the AS2201F-01-04S means equipping your pneumatic cylinders with a precise, stable, and easily integrated flow control partner. It ensures every motion is controlled, smooth, and perfectly timed, serving as a fundamental building block for enhancing pneumatic system performance and overall equipment reliability.
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