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Samson

Samson is one of the most prominent German manufacturers of pneumatic control valves, actuators, and process instrumentation with a history dating back to 1907. The company Samson AG, founded in Frankfurt, has more than a century of experience designing and producing high-quality control equipment for the chemical, petrochemical, pharmaceutical, power generation, and water treatment industries.

The core product of Samson are the pneumatic control valves of type 3241 and type 3251. The type 3241 is a straight globe control valve with DIN flange connection for general process fluids, gases, and steam, available in flange connections from DN 15 to DN 250 and pressure classes PN 16 to PN 40. The type 3251 is an angle-seat control valve with identical flange pattern for applications with viscous media, solid particles, or at high differential pressures where the angle construction minimizes back pressure and erosion. Both valve types are available with different flow paths, sealing materials (PTFE, EPDM, NBR, FKM, metal-to-metal), and Kv values.

The Samson pneumatic actuators type 3271 and type 3277 form the driving element of the control valve installation. The type 3271 is a large diaphragm actuator for valves requiring high driving forces at low instrument air pressure. The compact type 3277 is designed for applications with limited installation space and is directly mounted on the control valve body. Both actuators are available in fail-open and fail-closed versions for fail-safe process protection.

For precise process control, Samson supplies the type 3730 electronic positioner that converts the valve signal from 4-20 mA into a precise actuator position. The 3730 is equipped with HART communication for integration into DCS systems and features an automatic calibration routine that automatically learns the actuator travel limits. For ATEX zone 1 and zone 2 applications, certified versions of all Samson components are available.

Verkopershulp.nl supplies original Samson control valves, actuators, positioners, and spare parts such as seal kits, spring sets for actuators, diaphragm sets, and valve seats. Our process specialists advise on the correct valve-actuator-positioner combination for your specific process conditions and safety requirements.

History

Samson AG was founded in 1907 in Frankfurt, Germany. The company started as a manufacturer of thermostats and simple control components for the heating industry and gradually grew into a leading supplier of complex process control equipment. In the second half of the 20th century, Samson introduced groundbreaking electronic positioners that significantly improved the accuracy of process control loops in the chemical and petrochemical industry. The acquisition of several European control valve manufacturers strengthened Samson's product portfolio and market position in Europe. Today Samson AG is present in more than 40 countries with production, assembly, and service facilities and supplies customers in all major process industries worldwide.

Product Categories

  • Actuator
  • Bearing
  • Connector
  • Control Valve
  • Controller
  • Coupling
  • Display & Indicator
  • Drive
  • Gauge
  • Gear Pump
  • Level Sensor
  • Meter
  • Module
  • Motor
  • Pressure Gauge
  • Pump
  • Regulator
  • Seal & Gasket
  • Sensor
  • Solenoid Valve
  • Spring
  • Switch
  • Thermostat
  • Valve

Applications

  • Chemical process industry liquid and gas control
  • Petrochemical refineries
  • Power plants and CHP installations
  • Pharmaceutical production ATEX and hygienic
  • Water treatment and drinking water production
  • Steam networks and condensate treatment
  • LNG installations and gas transport
  • Food and beverage production
  • Pulp and paper industry
  • Large-capacity refrigeration and HVAC

Frequently Asked Questions

What is the difference between Samson type 3241 and type 3251 control valves?
The type 3241 is a straight globe control valve with a straight-through flow path, suitable for general process fluids, gases, and steam. The type 3251 is an angle-seat control valve where the medium changes direction 90 degrees at the seat. The angle construction of the 3251 makes it better suited for viscous media, solid particles, and situations with high differential pressure, because the valve is less susceptible to erosion and cleans more easily when contaminated.
How do I install a Samson type 3730 positioner?
The Samson 3730 positioner is mounted on the actuator via a standard NAMUR bracket. After mechanical mounting, perform the Auto-Set procedure: press the selector button and the 3730 automatically learns the actuator stroke. Connect the 4-20 mA control signal from your DCS or PLC to the input terminals and the instrument air to the P connection. Set the desired fail-safe position via the rotary switch.
Are Samson control valves available with ATEX certification?
Yes, Samson supplies control valves, actuators, and positioners in ATEX-certified configuration for zone 1 (Exd and Exi) and zone 2. The ATEX versions are available for all common valve and actuator types. Consult the product catalog or contact us for specific ATEX categories and gas groups per component.
Which Kv values are available for Samson type 3241?
The Samson type 3241 control valve is available in a wide range of Kv values from approximately 0.04 (DN 15) to more than 400 m³/h (DN 200). The valve has an equal-percentage or linear flow characteristic depending on the chosen plug. For your process design, you can calculate the required Kv value based on maximum flow, differential pressure, and viscosity of your medium.
How do I replace the packing of a Samson control valve?
Isolate the valve from the process and release the instrument air from the actuator. Dismount the actuator from the valve body. Remove the bonnet and pull the valve stem with plug upward out of the valve body. Replace the packing set (V-rings or PTFE sleeve) and the O-rings on the valve body. Reassemble in reverse order and adjust the valve spring according to the offset values on the nameplate. Use only original Samson seal kits.
Are Samson safety shutoff valves SIL-certified?
Yes, certain Samson safety shutoff valves and actuator combinations are certified for SIL 2 (IEC 61508 category) and SIL 3 conforming to IEC 61508 and IEC 61511. The SIL certifications apply to specific product combinations with matching fail-safe spring actuators. The relevant Safety Manual per product describes the PFD/PFH values and the minimum proof-test interval for use in functional safety circuits.
Does Verkopershulp.nl supply spare parts for all Samson valve types?
Verkopershulp.nl supplies original Samson spare parts for all common valve types, including seal kits (gaskets, O-rings, V-rings), diaphragm sets for actuators, valve stems, plugs, seats, spring packages for actuators, and handwheel actuators. Provide the complete valve type number including DN, PN, and Kv, as well as the actuator number, for exact part identification.
Can I order a Samson control valve in fail-open or fail-closed configuration?
Yes, Samson control valves with pneumatic actuators are standard available in fail-closed (FLC, spring-close) and fail-open (FLO, spring-open) configuration. The fail-safe direction is determined by the spring loading in the actuator and the mounting position of the actuator on the valve. When ordering, explicitly state the desired fail-safe direction for the correct configuration of actuator and valve.