Equipment and spare partsBrowse manufacturers Search by manufacturerCONTROL VALVES AND PROCESS AUTOMATION
Specify a SAMSON control valve, pneumatic diaphragm actuator, digital positioner or self-operated regulator matched to your process media, pressure drop and plant design.
Choose a process category. Attach an equipment data sheet, nameplate photo or engineering specification to make the enquiry precise.
Globe and angle control valves Type 3241, 3251, 3244 and 3321 control flow rates of liquids, gases and steam in industrial plants. The modular design accommodates noise-reducing trims, TA-Luft bellows seals and exchangeable seats matched to the required flow coefficient Kvs.
Specify pipe size DN, pressure rating PN, differential pressure, fluid medium and operating temperature.
Multi-spring diaphragm actuators Series 3271 and 3277 generate positioning force for linear control valves. The actuators provide fail-close or fail-open safety functions via internal springs upon loss of pneumatic supply air.
Order data: diaphragm area (120–2800 cm²), stroke length, spring range and fail-safe direction.
Electric actuators Series 3374 with thrust forces from 500 to 2500 N operate in industrial plants and district heating networks. An optional mechanical spring return ensures rapid fail-safe valve positioning within 2 to 8 seconds on power failure.
Specify thrust force, power supply (230V / 24V), control signal (4–20mA / 0–10V) and fail-safe spring requirement.
Smart positioners SAMSON 3730 provide precise stem positioning via analogue current loops or fieldbus communication. The integrated EXPERTplus firmware conducts diagnostic tests on packing friction, diaphragm health and partial stroke testing (PST).
State model 3730-X, communication protocol (HART, Profibus, FF), hazardous area rating Ex and limit switches.
Autonomous regulators Type 41-23 (pressure reducing) and Type 41-73 (excess pressure) maintain set pressures for steam, gases and liquids without auxiliary power. A pressure-balanced plug ensures stable setpoints regardless of inlet pressure fluctuations.
Specify setpoint range (bar), pipe size DN, pressure class PN, fluid medium and steam temperature.
Self-operated temperature regulators control heating and cooling processes in boilers, heat exchangers and storage tanks. A thermostat connected by capillary tubing converts fluid thermal expansion directly into valve actuation force.
Specify temperature control range (°C), capillary length (2–15 m) and valve nominal diameter.
Electronic controllers TROVIS regulate heat distribution in substations and heating plants according to weather compensation curves. Onboard Modbus RTU and Ethernet communication interfaces enable seamless integration into building automation SCADA systems.
Specify number of heating/DHW circuits, communication interface and required Pt 1000 sensor set.
Group subsidiaries manufacture specialized flow control equipment for extreme conditions: Pfeiffer PTFE/PFA lined valves for corrosive chemicals, SED aseptic diaphragm valves for pharmaceuticals, Vetec rotary plug valves and Starline forged ball valves.
State subsidiary brand (Pfeiffer, SED, Vetec, Starline), valve category, fluid medium and connection standard.
Process fluid, design flow rate, operating temperature, upstream and downstream pressures, required flow coefficient Kvs and actuation signal.
Valve type, pipe size DN, pressure class PN, unique manufacturing identifier (Order No. or Var.-ID) and required spare items: diaphragms, seat rings, plugs or packing kits.
SAMSON manufactures modular control valves; globe valve Series 3241, 3251 and 3321 differ in pressure ratings, body patterns and metallurgical specifications. To specify a replacement, copy the valve type, pipe size DN, pressure class PN and unique order number (Order No.
-ID) from the metal nameplate. A series designation alone leaves dozens of trim and packing configurations open. If the nameplate is painted over, provide clear photographs of the installed assembly showing port dimensions and actuator mounting.
To size a control valve for a new process line, provide the fluid medium (steam, water, gas, hydrocarbons), density, operating and peak flow rates, and inlet/outlet pressures. These parameters determine the required flow coefficient Kvs, preventing cavitation, flashing and critical chokepoints.
SAMSON modular valve engineering allows seat rings and plugs to be replaced without removing the body from the pipeline, adapting installed assets to modified plant throughput.
Pneumatic actuators Series 3271 and 3277 are sized according to required closing thrust and valve travel. 0 bar). For plant safety configurations, define the required fail-safe action upon air failure: fail-close (FA / air-to-open) or fail-open (FE / air-to-close) powered by internal spring packs.
Digital positioners SAMSON 3730 ensure accurate valve stem alignment across linear and rotary applications. Specify the required communication protocol: standard analogue 4–20 mA current loop, HART digital layer (Type 3730-3), Profibus-PA (Type 3730-4) or Foundation Fieldbus (Type 3730-5).
For hazardous process environments, state whether intrinsic safety Ex ia or explosion-proof enclosure Ex d is required by your site classification.
Self-operated regulators Type 41-23 (pressure reducing) and Type 41-73 (excess pressure) function using medium line energy without external utilities.
On saturated or superheated steam service above 150 °C, an impulse condensation chamber must be fitted between the steam pipe and diaphragm actuator. The water seal prevents thermal degradation of elastomer diaphragms. Specify pressure setpoint range, steam temperature and capacity.
Temperature regulators Type 1, 4, 8, 9 and 2114 control heating and cooling loops in calorifiers, heat exchangers and pasteurisers. A sensor bulb connected via capillary tubing transmits fluid thermal expansion to the valve plug.
When ordering, state temperature setpoint range in Celsius, capillary length (2, 3, 5 m or extended up to 15 m) and thermowell material. If damaged, sensor thermostats are replaced as pre-calibrated hermetic modules.
Electronic microprocessor controllers TROVIS 5576 and 5578 regulate heat distribution in district heating substations and boiler houses using weather compensation curves.
Specify the number of heating and domestic hot water (DHW) circuits, communication bus interfaces (RS-485 Modbus RTU, Ethernet) and Pt 1000 temperature sensor assignments. When replacing equipment, provide installed firmware versions to retain circulation routines.
Valves produced by Group company Pfeiffer Chemiearmaturen feature monolithic fluoropolymer linings in PTFE and PFA, delivering superior chemical resistance against concentrated acids, chlorine, alkalis and aggressive solvents.
The ductile iron outer shell absorbs pipeline mechanical stresses while the fluoropolymer isolates the process medium. State exact chemical composition, concentration, operating temperature and allowable differential pressure.
4435 (316L). 4 µm to eliminate bacterial adhesion and ensure validated CIP/SIP sanitisation cycles. State pipe connection standard (Tri-Clamp, orbital weld ends to DIN/ASME BPE) and diaphragm material (EPDM or PTFE/EPDM backed).
Confirm the scope of supply: complete control assemblies with actuators and positioners, replacement seal kits, or standalone instrumentation modules. State exact nameplate designations and material certificate requirements for each line item.
Application compatibility is reviewed upon quotation; prices, shipping lead times and ex-works availability are confirmed in formal commercial offers.
Select a process direction or send operating parameters with your reply contact. Valve execution, actuator sizing, positioner bus protocol and compliance documents are agreed in one enquiry.
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