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All-stainless-steel double-acting round cylinder, specially designed for food, pharmaceutical, humid and corrosive environments. Equipped with pneumatic cushioning adjustable at both ends (PPV), it meets the requirements of dynamic load and speed regulation.
- Model Segment Definition
| Model Segment | Meaning | Detailed Description |
| CRDSNU | Stainless steel round cylinder | CR = corrosion-resistant; D = double-acting; S = round type; NU = standard type; full stainless steel structure (barrel / end caps / piston rod) |
| 40 | Bore size | 40 mm, determines thrust and tension rating |
| 50 | Stroke | 50 mm, maximum travel distance of the piston |
| PPV | Cushioning type | Pneumatic cushioning adjustable at both ends; cushioning intensity adjustable independently on each side |
| A | Piston rod end type | External thread (M12×1.25), standard mounting interface |
- Core Specification Parameters
| Parameter Category | Technical Data | Remarks |
| Basic Characteristics | ||
| Action type | Double-acting | Requires air supply on both sides to realize push and pull motion |
| Bore / Stroke | 40 mm / 50 mm | Standard size, suitable for medium and small loads |
| Piston rod specification | M12×1.25 external thread | Standard ISO thread for easy load connection |
| Port size | G1/8 | Air inlet / outlet port, compatible with standard pneumatic components |
| Performance Parameters | ||
| Operating pressure range | 0.1–1.0 MPa (1–10 bar) | Suitable for most pneumatic systems |
| Theoretical thrust @ 6 bar | 754 N | Calculation formula: F=π×(D/2)2×p |
| Theoretical tension @ 6 bar | 633 N | Calculated value after deducting piston rod area |
| Cushioning type | PPV (adjustable at both ends) | Cushioning stroke approx. 18 mm, adaptable to different speeds and loads |
| Temperature range | −40 °C … +120 °C | Wide temperature design; S6 seal required for extreme high temperature |
| Material & Compliance | ||
| Main material | High-alloy stainless steel (CRC3) | Corrosion resistance Class 3, excellent anti-corrosion performance |
| Seal material | Standard NBR / optional FKM | FKM suitable for high temperature and chemical environments |
| Lubrication grade | NSF‑H1 food-grade grease | Direct food contact acceptable, compliant with FDA requirements |
| Protection class | IP65 | Dustproof and waterproof, suitable for harsh environments |
| Mounting & Dimensions | ||
| Mounting method | Any mounting position | Compatible with various mounting accessories (flange / foot bracket / trunnion, etc.) |
| Position detection | Compatible with proximity sensors (SMT / SME series) | Magnetic switch optional for position feedback |
| Overall dimensions | Diameter 40 mm × Total length 180 mm | Compact structure, saves installation space |
| Weight | Approx. 1.2 kg | Stainless steel construction, robust and durable |
- Recommended Accessories List
| Accessory Type | Model | Function Description |
| Mounting Accessories | ||
| Front flange | FNC‑40 | Front fixed mounting, suitable for narrow spaces |
| Rear flange | FNCB‑40 | Rear fixed mounting for easy cylinder disassembly |
| Foot mounting bracket | HNC‑40 | Bottom support mounting with high stability |
| Trunnion mounting | HNZ‑40 | Swing mounting for angular operating conditions |
| Pneumatic Accessories | ||
| One-way flow control valve | VFOE‑3/8‑1/8 | G1/8 port, precise cylinder speed control |
| Push-in fitting | QS‑8‑1/8 | Fast tubing connection, easy installation |
| Silencer | U‑1/8 | Reduces exhaust noise and environmental noise pollution |
| Detection Accessories | ||
| Magnetic proximity switch | SME‑8‑NS‑24V‑KC | Position sensing, suitable for food-grade environments |
| Sensor mounting bracket | DMS‑40 | Fixes magnetic switch with flexible installation |
| Special Accessories | ||
| High-temperature seal kit | S6 | Adaptable to ambient temperature up to +120 °C |
| Extended piston rod | K8 | Extends effective stroke for special mounting requirements |
- Competitor & Cross-Brand Comparison
| Brand | Model | Matching Degree | Core Difference |
| Festo | CRDSNU-40-50-PPS-A | 100% | PPS = self-adjusting cushioning; PPV = manually adjustable cushioning (this model) |
| Festo | DSNU-40-50-PPV-A | 90% | DSNU = carbon steel barrel; CRDSNU = full stainless steel with superior corrosion resistance |
| SMC | CD85N40-50-B | 85% | Stainless steel cylinder, double-acting, adjustable cushioning, R1/8 port |
| Airtac | SI40×50-P | 80% | Stainless steel cylinder, double-acting, elastic cushioning, cost-effective |
| Norgren | RM/8020/M/50 | 75% | Stainless steel cylinder, double-acting, self-adjusting cushioning, different mounting structure |
- Selection Guidelines & Alternative Solutions
5.1 Three Key Selection Factors
Load matching: Thrust ≥ Load × 1.5 safety factor; 40 mm bore provides 754 N thrust @ 6 bar, suitable for load ≤ 500 N.
Stroke confirmation: Reserve ≥10 mm cushioning space for 50 mm stroke to avoid rigid impact.
Environmental adaptation:
Food / pharmaceutical industry: Must adopt CRDSNU (full stainless steel + NSF‑H1 lubrication).
High temperature (>80°C): Equip with S6 high-temperature seal kit.
Chemical corrosion environment: Adopt FKM seals + CRC3 stainless steel.
5.2 Recommended Alternative Solutions
| Application Scenario | Recommended Solution | Advantages |
| Standard food-grade environment | CRDSNU-40-50-PPV-A | Full stainless steel + adjustable cushioning, suitable for dynamic loads |
| Static load working condition | CRDSNU-40-50-PPS-A | Self-adjusting cushioning, maintenance-free, lower cost |
| Ultra-high temperature (>120°C) | Custom high-temperature cylinder | Special seals and materials for extreme temperature conditions |
| Budget-limited project | Domestic stainless steel cylinder (e.g. Airtac SI series) | High cost performance, meets basic functional requirements |
| Clean room environment | CRDSNU-40-50-PPV-A + A1 wiper ring | Enhanced chemical resistance, meets clean room standards |
5.3 Installation & Maintenance Guidelines
- Clean cylinder ports before installation to prevent impurities from entering and shortening seal service life.
- Cushioning adjustment: Start with minimum cushioning, then gradually increase to proper effect; avoid over-cushioning causing cylinder creeping.
- Pipe length ≤ 5 m, inner diameter ≥ 6 mm to ensure stable air supply.
- Regular inspection every 6 months: Check seal condition, piston rod surface and cushioning performance; replace parts in time if abnormal.
- Rinse with clean water after use in food processing environments to keep the cylinder clean.
CRDSNU-40-50-PPV-A is a full stainless steel round cylinder developed by Festo for harsh working environments. Its core advantages include CRC3 corrosion resistance, PPV adjustable cushioning and NSF‑H1 food-grade lubrication, perfectly applicable to food & beverage, pharmaceutical, water treatment and other industries. With 40 mm bore, 50 mm stroke and adjustable cushioning at both ends, it flexibly adapts to various load and speed requirements, making it an ideal pneumatic actuator for harsh environments.
