ALFACOM ENGINEERING LTD.
Steam and Process Control Valves
Control valves regulate flow in response to process requirements. Explore pneumatic and electric operation, thermostatic control, on-off duties and the associated positioners and control accessories.
Steam and Process Control Valves · Illustrative catalogue image
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Electric Actuators for Control Valves
On-Off Valves
Positioners and Signal Converters
Control and Measurement Accessories
Boiler Blowdown and TDS Control
Thermostatic Control Valves
Model & Technical Document Index
Select the equipment family and model below. Review the application and model-specific document before requesting selection and a quotation.
Control-Valve Bodies & Pneumatic Linear Actuators
V25/2 · Two-Way Globe Control ValveV16/2 · ASME Family · DN15–100V16/2 · EN Family · DN15–100PV25 · Pneumatic Control Valve · DN15–100V25 · Control Valve · DN125–200PV25S · ASME Pneumatic Control ValvePV25 · Threaded Control Valve · DN15–25PWV40I · Wafer Control Valve · DN15–25PV40S · Pneumatic Control Valve · DN15–50PV253G · Three-Way Control ValvePV403 · Three-Way Mixing Valve · DN15–50PV403 · Three-Way Control Valve · DN65–100PA205–PA435 · Pneumatic Linear ActuatorsPA10 / PA25 / PA40 / PA80 · Linear ActuatorsPA45 · Pneumatic Linear Actuator
Electric Linear Actuators
Pneumatic On-Off Valves
Positioners & Signal Converters
Control & Measurement Accessories
Boiler Bottom-Blowdown & TDS Valves
Equipment Details & Selection
Control-Valve Bodies & Pneumatic Linear Actuators
V25/2 · Two-Way Globe Control Valve
Control-valve body family for process duties, with trim and construction options to be assessed for the application.
Provide fluid conditions, minimum and maximum flow, pressure drop and required shut-off. Where cavitation, flashing or erosion may occur, qualify the trim and operating duty explicitly; select the actuator separately.
V16/2 · ASME Family · DN15–100
Single-seat two-way globe control-valve family for compatible process-control and shut-off duties.
Use the ASME-family connection and dimensional data. Select trim, flow coefficient and actuator using the full operating envelope and required fail action.
V16/2 · EN Family · DN15–100
Two-way single-seat globe control-valve family for compatible industrial process applications.
Use the EN-family document for the selected body and connection. Match trim, actuator, positioner and required shut-off to the operating duty.
PV25 · Pneumatic Control Valve · DN15–100
Two-way single-seat control valve with a pneumatic diaphragm actuator for compatible process fluids.
The source covers direct and reverse actuator actions. Specify required fail position, pressure drop, flow range and shut-off requirements before assembly selection.
V25 · Control Valve · DN125–200
Larger two-way single-seat control-valve family, with pneumatic or electric actuation options described in the source.
Use the DN125–200 sizing and dimensional data. Confirm actuator type, required thrust, fail action and control requirements.
PV25S · ASME Pneumatic Control Valve
Two-way pneumatic control-valve family with ASME connection variants.
Use the ASME-family model document for sizing and flange details. Confirm control action, required fail position, trim and operating conditions.
PV25 · Threaded Control Valve · DN15–25
Threaded two-way control-valve family with a pneumatic diaphragm actuator.
Select the flow coefficient from the actual process duty. Confirm thread, actuator action, positioner and required shut-off as one assembly.
PWV40I · Wafer Control Valve · DN15–25
Two-way single-seat pneumatic control valve in a wafer arrangement.
Confirm mating flanges and installation dimensions as well as trim, actuator action and flow duty. Verify the selected pressure-temperature and material limits.
PV40S · Pneumatic Control Valve · DN15–50
Two-way single-seat control-valve family with a pneumatic diaphragm actuator.
Provide fluid, flow range, upstream and downstream pressures, temperature and required fail position for trim and actuator selection.
PV253G · Three-Way Control Valve
Three-way pneumatic control-valve family with mixing and diverting duties described in the source.
Specify mixing or diverting service explicitly, including branch flows and pressures. Confirm port arrangement, actuator action and the selected construction.
PV403 · Three-Way Mixing Valve · DN15–50
Three-way pneumatic control-valve family whose referenced small-size sheet specifies mixing service.
Confirm the mixing-port arrangement and branch duties. Do not assume the larger PV403 family installation or flow arrangement applies to this body.
PV403 · Three-Way Control Valve · DN65–100
Larger three-way pneumatic control-valve family with mixing or diverting service described in its source.
Use the DN65–100 document to confirm the selected service, port layout and flow limits. Size the valve and actuator for the actual branch conditions.
PA205–PA435 · Pneumatic Linear Actuators
Multi-spring linear actuator family for modulating or open-close operation of compatible valves.
Select using required stroke and thrust, air supply, spring range and fail action. Confirm mechanical coupling and compatibility with the selected valve.
PA10 / PA25 / PA40 / PA80 · Linear Actuators
Pneumatic multi-spring linear actuator families with rolling diaphragms for compatible control-valve assemblies.
Match actuator size, stroke, thrust and spring range to the valve and differential pressure. Confirm the required fail position and instrument-air supply.
PA45 · Pneumatic Linear Actuator
Multi-spring pneumatic linear actuator for suitable modulating or open-close valve duties.
Confirm stroke, required thrust, spring range, air supply and coupling. Select the actuator action for the required assembly fail position.
Electric Linear Actuators
EL · Electric Linear Actuators
Electric linear actuator family for compatible modulating or open-close control-valve duties.
Specify supply voltage, control signal, stroke, thrust and operating duty. Confirm the exact actuator options and valve coupling.
ELR · Electric Linear Actuators with Spring Return
Electric linear actuator family with a spring-driven fail action on power loss.
The return direction depends on the selected version and valve arrangement. Specify the required fail position, stroke, thrust, supply and control signal explicitly.
Pneumatic On-Off Valves
PV15 · Pneumatic On-Off Globe Valve
Two-way single-seat pneumatic globe valve with a diaphragm actuator for compatible process isolation duties.
Confirm the required open/close function, fail position, differential pressure and selected connection. Size the actuator and verify material compatibility for the process.
PAV21 · Pneumatic Angle-Seat Valve
Pneumatic angle-seat interception-valve family for compatible steam, gas and liquid process duties.
Select operating action, connection and actuator arrangement using the actual fluid and differential pressure. Confirm the required fail position.
PPV25 · Pneumatic On-Off Valve · DN15–50
Two-way single-seat on-off valve with a pneumatic piston actuator.
Confirm the selected connection, pressure differential and operating action. Specify the required fail position and actuator-air supply.
PPV25I · Threaded On-Off Valve · DN15–25
Threaded two-way on-off valve with a pneumatic piston actuator.
Check fluid and seal compatibility, thread and differential pressure. Confirm air supply and the required open/close or fail action.
PV25G · Pneumatic On-Off Valve · DN15–100
Two-way isolation-valve family with a multi-spring pneumatic diaphragm actuator.
The source describes direct and reverse actions. Specify the required fail position, shut-off duty and actuator supply conditions.
Positioners & Signal Converters
PS100 · Digital Valve Positioner
Digitally configurable positioner for compatible pneumatic linear or rotary valve actuators.
Confirm the actuator type, mounting, control signal, air supply and required options. Commission the positioner for the actual stroke, rotation and valve action.
EAA 500X · I/P & E/P Signal Converters
Electro-pneumatic transducer family converting an electrical current or voltage signal to a proportional pneumatic pressure signal.
Select the exact model code by input signal and required output range. A signal converter does not provide valve-position feedback in the way a positioner does.
PE986 · Electro-Pneumatic Positioner
Positioner using an electrical command and actuator-position feedback to control a pneumatic actuator.
Confirm control input, air supply, mounting and actuator compatibility. Set the selected action and travel range during commissioning.
PI991 · Intelligent Valve Positioner
Microprocessor-based positioner for pneumatic valve actuators, with local or control-system operation described in the source.
Verify the exact device version, communication and diagnostic options, mounting and air-supply requirements before selection.
PI998 · Intelligent Valve Positioner
Intelligent positioner for pneumatic valve actuators, with configuration and diagnostic functions described in the model document.
Confirm the selected communication version, mounting kit, actuator action and air-supply requirements. Match options to the actual control system.
PP981 · Pneumatic Positioner
Positioner comparing a pneumatic control signal with actuator-position feedback and adjusting its pneumatic output accordingly.
Confirm input range, air supply and actuator mounting. Set action and travel for the selected control-valve assembly.
PC25 · Electro-Pneumatic Converter
Converter producing a pneumatic pressure signal from an electrical control input.
Confirm the selected electrical input and pneumatic output range together with supply-air requirements. Match the converter to the downstream device.
Control & Measurement Accessories
BCS-211 · Boiler TDS Conductivity Controller
Conductivity-control equipment for an appropriate boiler TDS measurement and blowdown arrangement.
Confirm the probe, controller and valve arrangement as a system. Establish the required measurement range and control function for the actual boiler and water-treatment duty.
P10 · Air Filter Regulator
Filter-regulator equipment for an appropriate instrument-air supply arrangement.
Specify supply pressure, required regulated pressure and air demand. Confirm connection, filtration and drain arrangements for the downstream actuator or instrument.
SPS-21 · Conductivity Probe
Conductivity-probe equipment for a compatible TDS measurement or control system.
Confirm controller compatibility, mounting, immersion arrangement and operating limits. Use the selected probe instructions for installation and maintenance.
SPS-33 · Conductivity Probe
Conductivity-probe family for an appropriate boiler-water TDS measurement arrangement.
Verify controller compatibility, process connection and installation geometry. Select for the actual water conditions and measurement duty.
SV32C / SV32H · 3/2 Pneumatic Solenoid Valves
Solenoid-valve family for compressed-air control of pneumatic actuators and other suitable on-off pneumatic duties.
SV32C is direct acting with spring return; SV32H uses internal pilot operation. Confirm the exact model, coil supply, flow requirement and air conditions. These are pneumatic control components, not direct steam-line isolation valves.
TRPT1 · Pt100 Temperature Sensor
Temperature-sensing equipment for compatible process measurement and control applications.
Confirm sensor length, connection, wiring and operating range. Match the sensor and any protection arrangement to the controller and process.
UC-820 · Universal Process Controller
Process-controller equipment for compatible industrial measurement and control duties.
Specify input sensor or signal, output type, supply and required control functions. Confirm the exact controller version and external device compatibility.
Boiler Bottom-Blowdown & TDS Valves
VPA26/2 · Boiler Bottom-Blowdown Valve
Valve equipment for an appropriate boiler bottom-blowdown arrangement.
Select using boiler conditions, discharge duty, connection and the required actuation/control arrangement. Confirm the complete blowdown installation against the model instructions.
VPC26 · Boiler TDS Control Valve
Control-valve equipment for an appropriate boiler TDS blowdown arrangement.
Confirm boiler pressure, required blowdown flow, actuation and the conductivity-control system. Verify the valve and discharge arrangement as one installation.
Thermostatic Heating & Cooling Valves
TR25S · Thermostatic Control Valve · DN15–25
Thermostatically controlled valve family for compatible temperature-control duties.
Confirm the intended heating function, temperature range, sensor and installation arrangement. Use the model document for valve action and connection requirements. The referenced heating arrangement closes the valve as the sensed temperature rises.
TR25/R · Cooling Control Valve · DN15–25
Thermostatic control-valve family for appropriate cooling duties.
Specify the required cooling function and temperature set range explicitly. Confirm sensor placement, valve action and capillary/installation requirements. The cooling version opens as the sensed temperature rises.
TR25SS · Thermostatic Valve · DN8–10
Small-size stainless steel thermostatic control-valve family.
Use the DN8–10 model document for the selected duty and installation. Confirm temperature range, sensor arrangement and valve action. The referenced heating arrangement closes the valve as the sensed temperature rises.
TR25SS · Thermostatic Valve · DN15–25
Stainless steel thermostatic control-valve family for compatible temperature-control duties.
Use the DN15–25 sizing and connection data. Confirm heating or other permitted service, sensor location and the selected temperature range. The referenced heating arrangement closes the valve as the sensed temperature rises.
TR40 · Flanged Thermostatic Valve · DN15–25
Flanged thermostatic control-valve family for compatible temperature-control applications.
Confirm the selected operating function, sensor, temperature range and installation arrangement. Check the applicable pressure-temperature limits for the actual flange version. The referenced heating arrangement closes the valve as the sensed temperature rises.
APPLICATION BEFORE SPECIFICATION
Selection Starts with Your Application
Provide the fluid, flow range, upstream and downstream pressures, temperature, control signal and required failure position. Include available utilities, connection requirements and details of the process control duty.
Catalogue & Technical Documents
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Availability and lead time are confirmed for the requested model and quantity.