Samson Type 3251 Heavy-Duty Severe Service Globe Control Valves
The Samson Type 3251 Severe Service Globe Control Valve Series (featured model: Type 3251 DN 50 Class 600 with Type 3271 Actuator) is SAMSON AG's ultimate process control platform engineered specifically for extreme operating conditions, high differential pressures, flashing liquids, cavitating flows, and high-temperature steam loops in oil refineries, petrochemical synthesis, power station turbine bypass stations, and offshore gas processing plants[cite: 12]. Built with heavy-wall cast steel (1.0619 / A216 WCB), high-temperature alloy steel (1.7335 / A217 WC6), stainless steel (1.4408 / A351 CF8M), or forged bodies, Type 3251 valves feature **heavy-duty pressure-balanced plugs**, anti-cavitation cages (AC-1 / AC-2 / AC-3), and Stellite-faced or tungsten carbide trims[cite: 12]. To prevent toxic gas leakage or high-temperature steam losses, the valve can be equipped with an insulating section or a **double-wall stainless steel bellows seal bonnet**[cite: 12]. Actuated by high-thrust **Type 3271 or Type 3277 multi-spring pneumatic diaphragm actuators** and integrated **Type 3730 smart digital positioners**, Type 3251 valves deliver precise flow control, tight shut-off options (Class IV to Class VI), and robust noise attenuation across nominal sizes from **DN 15 to DN 500 (1/2" to 20")** with Kvs values from **0.1 to 3150**[cite: 12]. WE DRIVE HONGKONG LIMITED provides technical sourcing, severe-duty Kvs flow calculations, anti-cavitation trim selection, and global express supply for Samson Type 3251 severe service valve assemblies worldwide[cite: 12].
Technical Specifications
| Featured Model | Type 3251 DN 050 Class 600 (Heavy-Duty Severe Service Globe Valve, DN 50 Flanged Body, Forged Alloy Steel A217 WC6, Anti-Cavitation Perforated Cage Trim, Kvs 40, Type 3271 750cm² Actuator, Type 3730-3 Positioner)[cite: 12] |
|---|---|
| Brand / Manufacturer | SAMSON AG (German Precision Process Control Engineering)[cite: 12] |
| Product Series | Type 3251 Series (Series 250 Severe Service & High-Pressure Control Valve Architecture)[cite: 12] |
| Nominal Size Range (DN) | DN 15 to DN 500 (1/2 Inch to 20 Inches Nominal Bore)[cite: 12] |
| Pressure Rating Range | PN 16 to PN 400 / ASME Class 150, Class 300, Class 600, Class 900, Class 1500 & Class 2500[cite: 12] |
| Flow Coefficient Range (Kvs / Cv) | Kvs 0.1 to Kvs 3150 (Cv 0.12 to Cv 3600 Equal Percentage or Linear Characteristic)[cite: 12] |
| Pneumatic Actuator Pairing | Type 3271 (High-Thrust) / Type 3277 (Integrated Positioner Mount) Diaphragm Actuators (350 cm² to 2800 cm² Double Actuator Options)[cite: 12] |
| Positioner & Protocol Options | Type 3730-2 / 3730-3 Smart Positioner (4-20mA, HART, PROFIBUS PA, FOUNDATION Fieldbus with EXPERT+ Diagnostics)[cite: 12] |
Documentation & Resources
Samson Type 3251 Valve Size, Pressure Class & Actuator Matching Matrix
Complete selection matrix for Samson Type 3251 heavy-duty globe control valves. Review nominal sizes, pressure ratings, Kvs flow coefficients, paired actuator diaphragm areas, and model codes[cite: 12]:
| Samson Valve Size | ASME Pressure Class | Standard Kvs Flow Range | Rated Travel (Stroke) | Recommended Actuator Area | Samson Configuration Example |
|---|---|---|---|---|---|
| Type 3251 DN 25 (1") | Class 150 to Class 2500 | Kvs 0.1 to Kvs 10.0 | 15 mm / 30 mm Travel | 350 cm² / 750 cm² (Type 3271)[cite: 12] | 3251-1 DN25 CL600 Kvs10[cite: 12] |
| Type 3251 DN 50 (2") | Class 150 to Class 2500 | Kvs 4.0 to Kvs 40.0 | 30 mm Travel | 750 cm² / 1400 cm² (Type 3271)[cite: 12] | 3251-1 DN50 CL600 Kvs40[cite: 12] |
| Type 3251 DN 80 (3") | Class 150 to Class 1500 | Kvs 16.0 to Kvs 100.0 | 30 mm / 60 mm Travel | 750 cm² / 1400 cm² (Type 3271)[cite: 12] | 3251-1 DN80 CL900 Kvs100[cite: 12] |
| Type 3251 DN 100 (4") | Class 150 to Class 1500 | Kvs 25.0 to Kvs 160.0 | 60 mm Travel | 1400 cm² / 2800 cm² (Type 3271)[cite: 12] | 3251-1 DN100 CL600 Kvs160[cite: 12] |
| Type 3251 DN 150 (6") | Class 150 to Class 900 | Kvs 63.0 to Kvs 360.0 | 60 mm / 120 mm Travel | 1400 cm² / 2800 cm² (Type 3271)[cite: 12] | 3251-1 DN150 CL600 Kvs360[cite: 12] |
| Type 3251 DN 200-500 | Class 150 to Class 600 | Kvs 250.0 to Kvs 3150.0 | 120 mm / 200 mm Travel | 2800 cm² / Tandem 2x2800 cm²[cite: 12] | 3251-1 DN200 CL600 Kvs630[cite: 12] |
Standard Control Valve to Samson Type 3251 Severe Service Upgrade Guide
Direct replacement guide for upgrading failing standard globe valves or high-wear bypass valves in severe process lines[cite: 12]:
| Standard Process Control Valve | Severe Service Failure Mechanisms | Current Samson Type 3251 Equivalent | Key Metallurgy & Anti-Cavitation Advantages |
|---|---|---|---|
| Standard Globe Valve in Cavitating Liquid Line | Cavitation erosion destroying plug and seat faces, causing internal bypass leakage | Samson Type 3251 + AC-1 / AC-2 Anti-Cavitation Cage Anti-Cavitation Trim | Multi-stage pressure reduction cage prevents cavitation bubbles from collapsing against the valve wall[cite: 12]. |
| Standard Valve on High Differential Steam Line | Extreme acoustic noise (>100 dBA), pipe vibration, and actuator stem bending | Samson Type 3251 + Perforated Noise Cage Low-Noise Trim | Perforated noise cages reduce aerodynamic noise levels by up to 25 dBA, protecting nearby instruments[cite: 12]. |
| Conventional Valve in High-Temperature Refinery Line | Stem packing degradation and thermal expansion galling of internal guide bushings | Samson Type 3251 + High-Temp Bellows Bonnet Zero Leakage up to 550°C | Double-wall stainless steel bellows and extended insulating section isolate stem packing from high process heat[cite: 12]. |
Expert Technical Sourcing & Severe-Duty Process Loop Notes
When upgrading severe-duty process lines or replacing failing high-pressure valves, switching to Samson Type 3251 control valves delivers immediate benefits: robust heavy-wall body design, multi-stage cavitation and noise reduction, zero-emission bellows seal bonnets, exceptionally low actuator hysteresis, and advanced EXPERT+ positioner diagnostics[cite: 12]. Simply provide us with your complete valve VARIO code, serial number, or process fluid operating conditions (differential pressure, temperature, fluid state), and our technical engineering team will deliver a 100% compliant replacement specification and proposal[cite: 12].
Core Benchmark Model Standard Configurations
- Type 3251 DN 25 Class 600 Control Valve[cite: 12]
- Type 3251 DN 50 Class 600 Control Valve[cite: 12]
- Type 3251 DN 80 Class 600 Control Valve[cite: 12]
- Type 3251 DN 100 Class 600 Control Valve[cite: 12]
- Type 3251 DN 50 Class 900 Heavy Duty[cite: 12]
- Type 3251 DN 100 Class 1500 Heavy Duty[cite: 12]
- Type 3251 DN 150 Class 600 Heavy Duty[cite: 12]
- Type 3251 Forged Alloy Steel Body WC6[cite: 12]
- Type 3251 Stainless Steel Body CF8M[cite: 12]
- Type 3251 with Anti-Cavitation Cage AC-1[cite: 12]
- Type 3251 with Noise Reduction Cage[cite: 12]
- Type 3271 750 cm² High-Thrust Actuator[cite: 12]
- Type 3271 1400 cm² Pneumatic Actuator[cite: 12]
- Type 3271 2800 cm² Pneumatic Actuator[cite: 12]
- Type 3730-3 Advanced HART Positioner[cite: 12]
- Samson Severe Service Control Valve[cite: 12]
- Samson High Pressure Steam Bypass[cite: 12]
- Samson Type 3251 Chemical Duty[cite: 12]
- Samson Valve Positioner Calibration[cite: 12]
- WE DRIVE HK Samson Control Supplier[cite: 12]
