DARD-L8-40-S - Industrial Automation Festo - Free user manual and instructions
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| Product Type | One-way flow control valve |
| Brand | Festo |
| Model | DARD-L8-40-S |
| Category | Industrial Automation |
| Pneumatic Connection | Push-in connector for 8 mm tubing; threaded port G1/4 |
| Nominal Flow Rate | 0.1 to 1.0 l/min |
| Operating Pressure Range | 0.5 to 10 bar (7 to 145 psi) |
| Medium | Compressed air, neutral inert gases |
| Ambient Temperature Range | -10 °C to +60 °C |
| Valve Function | Adjustable throttling in one direction with free reverse flow via non-return valve |
| Adjustment Mechanism | Lockable adjusting screw for precise flow settings |
| Weight | 0.06 kg (approx.) |
| Dimensions (L x W x H) | 74 mm x 40 mm x 40 mm |
| Body Material | Aluminum alloy |
| Seal Material | Nitrile rubber (NBR) |
| Mounting Type | In-line installation; direct mounting on pneumatic hose |
| Maintenance | No regular maintenance required; inspect for wear on seals every six months |
| Cleaning | Wipe with damp cloth; avoid solvents that damage seals |
| Safety | Do not disassemble while system is under pressure; use certified safety equipment |
| Repairability | Replacement seal kits available; valve can be disassembled for seal replacement |
| General Information | Designed for reliable speed control of pneumatic actuators in industrial automation systems |
Frequently Asked Questions - DARD-L8-40-S Festo
What is the function of the Festo DARD-L8-40-S?
The DARD-L8-40-S is a one-way flow control valve that regulates the speed of pneumatic cylinders by throttling the exhaust air. It combines an adjustable throttle with a non-return check valve for unobstructed reverse flow.
How do I install the DARD-L8-40-S?
Connect the push-in fitting to an 8 mm pneumatic tube and the threaded port (G1/4) to a cylinder or valve. Ensure the flow direction matches the arrow on the body. Tighten the thread to the recommended torque (5 Nm) and verify the tube is fully seated.
How do I adjust the flow rate?
Use a screwdriver to turn the adjusting screw clockwise to decrease flow or counter-clockwise to increase it. Once the desired speed is set, tighten the locking lever to prevent unintentional changes. Always adjust under normal operating pressure.
What is the operating pressure range?
The valve operates safely between 0.5 and 10 bar (7 to 145 psi). Exceeding this range can damage the seal or body. Check your system pressure with a gauge before installation.
Can I use this valve with a different tube size?
No, the push-in fitting is designed specifically for 8 mm outer diameter tubing. Using other sizes can cause leaks or disconnection. Use an appropriate adapter if your system uses a different tube diameter.
How do I clean the DARD-L8-40-S?
Clean the exterior with a damp lint-free cloth. Do not use aggressive solvents, as they can degrade the NBR seals. For internal contamination, disassemble the valve only after depressurizing the system and wash parts with isopropyl alcohol.
Is the valve repairable?
Yes, the seal kit (part no. 8083499) allows replacement of all O-rings and seals. Disassembly requires a 5 mm hex wrench. After reassembly, perform a leak test to ensure proper sealing.
What materials are used in the construction?
The body is made of anodized aluminum, while the seals are nitrile rubber (NBR). The adjusting screw is brass with a nickel-plated finish. These materials provide good chemical resistance to compressed air at moderate temperatures.
What safety precautions should I follow?
Always disconnect and depressurize the pneumatic system before installation or maintenance. Do not exceed the maximum pressure or temperature. Use personal protective equipment such as safety glasses and cut-resistant gloves. Never modify the valve body.
How does the non-return function work?
The internal non-return valve allows free flow in one direction (from port 1 to port 2) and throttled flow in the opposite direction. This is used to control the exhaust speed of a cylinder while allowing rapid advance, improving cycle time and reducing shock.
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USER MANUAL DARD-L8-40-S Festo
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Product information
Brand : Festo
Model : DARD-L8-40-S
Category : Industrial Automation