» ASCO™ · Supplied by ACD America
ASCO™ Proportional Valves
Not open or shut — anywhere in between. Proportional valves meter flow in step with an electrical signal, so the process holds a setpoint instead of chasing it with on/off pulses.
Sizing a valve? Estimate flow, pressure drop or Cv/Kv with our free calculator.
Open the Flow Calculator →An on/off valve can only approximate a setpoint by cycling. A proportional valve holds it: the coil current sets how far the plunger lifts, and flow follows the signal. What matters then is not shut-off but the quality of that relationship — hysteresis (does it return to the same flow coming down as going up), repeatability and sensitivity (the smallest change it can resolve).
The line splits by how the loop is closed. Open loop — the 202 Posiflow, 202 Preciflow IPC, 203 and 209 — takes the command signal and trusts the valve; the IPC adds pressure compensation so inlet swings do not move the flow. External control — the 602 — ships with no on-board electronics at all, which is what you want when ambient heat would cook them. And the 610 MotorFlowD is motorised rather than solenoid, so it works where there is no pilot air, while the 630 piezo draws 0.004 W for battery-powered analytical instruments.
Select your valve
ASCO™ proportional valves we supply
Narrow the line by port size, media and voltage — then open the series for its full technical data. Every specification below comes from the manufacturer’s published data.
209
209 Proportional Valves
The current-generation direct-acting proportional valve: near friction-free internals give ≤0.2 % sensitivity and ≤15 ms response on air, neutral gases and liquids. Emerson positions it as its highest-precision, lowest-power proportional flow platform.
- ≤15 ms response
- Vacuum – 16 bar
- UL · UKCA · CE
202 IPC
202 Preciflow IPC Proportional Valves
Pressure-compensated Preciflow: the compensated architecture holds flow steady against inlet-pressure variation, which is what analytical and medical instrumentation needs.
- Pressure compensated
- Repeatability <1 %
- 170 l/min @ 2.7 bar
203
203 Posiflow Pilot-Operated Diaphragm Valves
Pilot-operated diaphragm Posiflow for modulating water and other liquids. Flow is adjustable across the full 0–100 % of rating and can be driven from sensors, transmitters or a PLC through an ASCO electronic control unit.
- Liquids & water
- 0–100 % adjustable
- Cv to 1.0
602
602 Proportional Solenoid Valves
Supplied without integrated control electronics, so mechanics, controller and sensor stay separate modules. Runs open loop from an external unit, or closed loop with a CONTROLD device and an external sensor — the answer when ambient heat rules out on-board electronics.
- No on-board electronics
- Kv 5.19 – 12+
- IP65 · hazardous
202 Posiflow
202 Posiflow Proportional Solenoid Valve
Direct-operated proportional valve whose large orifices and compact frictionless build target life-science instrumentation — respiratory therapy, gas chromatography, blood-pressure monitoring and anaesthesia delivery.
- From 1 W
- Hysteresis <5 %
- Vacuum capable
630
630 Low-Power Piezo Valve
Piezo-actuated proportional valve for analytical and diagnostic equipment where power budget and weight decide the design: 0.004 W, almost no heat dissipation, no wearing parts and a billion-cycle rated life.
- 0.004 W
- 1 billion cycles
- ATEX Zone 2-22
610
610 MotorFlowD Proportional Valve
Motorised — not solenoid — proportional flow valve with an integral controller, for plants with no pilot air available. A wear-resistant oxide-ceramic flat rotary slide makes it insensitive to contamination, and it runs on so little power it can be battery driven.
- No pilot air needed
- Ceramic rotary slide
- Kv 1.73 – 5.19
No series match that combination.
Clear a filter — or tell us the duty and our application engineers will pick the valve.
Request a Quote →Series 209
209 Proportional Valves
The current-generation direct-acting proportional valve: near friction-free internals give ≤0.2 % sensitivity and ≤15 ms response on air, neutral gases and liquids. Emerson positions it as its highest-precision, lowest-power proportional flow platform.
Technical data
- Port size
- 1/8" · 1/4" · pad mount
- Port type
- G ISO 228/1 BSPP · NPT · pad mount
- Control
- Open loop — direct-acting proportional solenoid driven by the electrical input signal
- Function
- 2-way normally closed
- Body material
- Brass · stainless steel
- Elastomers
- Multiple options including silicone-free (alcohol/sulphur resistance) and FDA-approved for food and beverage
- Operating pressure
- Vacuum to 16 bar
- Flow factor (Kv)
- 0.02 – 0.26
- Hysteresis
- ≤ 5 %
- Repeatability
- ≤ 1 %
- Sensitivity
- ≤ 0.2 %
- Response time
- ≤ 15 ms
- Enclosure
- IP65
- Approvals
- UL · UKCA · CE
- Voltages
- 12 V DC · 24 V DC
Series 202 IPC
202 Preciflow IPC Proportional Valves
Pressure-compensated Preciflow: the compensated architecture holds flow steady against inlet-pressure variation, which is what analytical and medical instrumentation needs.
Technical data
- Port type
- G1/8 · cartridge or pad mounting
- Control
- Open loop, pressure-compensated proportional solenoid
- Function
- 2-way normally closed
- Body material
- Stainless steel, brass or POM
- Operating pressure
- 0 – 7 bar (0 – 102 psi); max backpressure 10 % of inlet pressure
- Flow
- 170 l/min @ 2.7 bar (Cv 0.2)
- Hysteresis
- Typ. < 5 %
- Repeatability
- Typ. < 1 %
- Sensitivity
- Typ. < 1 %
- Enclosure
- IP50
- Approvals
- Applicable CE directives · RoHS
- Voltages
- 6 · 12 · 24 V DC
Series 203
203 Posiflow Pilot-Operated Diaphragm Valves
Pilot-operated diaphragm Posiflow for modulating water and other liquids. Flow is adjustable across the full 0–100 % of rating and can be driven from sensors, transmitters or a PLC through an ASCO electronic control unit.
Technical data
- Port size
- 1/4" · 3/8" · 1/2" NPT
- Port type
- NPTF
- Control
- Open loop, pilot-operated diaphragm — 0–100 % of rating, regulable from sensors, transmitters or PLC via an ASCO electronic control unit
- Function
- 2-way normally closed
- Body material
- Brass (stainless steel bodies available)
- Operating pressure
- Vacuum to 150 psig
- Flow factor (Cv)
- 0.05 – 1.0
- Power
- 22.6 W · coil class FB or HB
- Operating environment
- Indoor · outdoor
- Voltage
- 24 V DC
Series 602
602 Proportional Solenoid Valves
Supplied without integrated control electronics, so mechanics, controller and sensor stay separate modules. Runs open loop from an external unit, or closed loop with a CONTROLD device and an external sensor — the answer when ambient heat rules out on-board electronics.
Technical data
- Port size
- 1/4" · 1/2" · 1"
- Port type
- G ISO 228/1 BSPP
- Control
- Without integrated electronics — open loop with a control unit, or closed loop with a CONTROLD device and an external sensor
- Function
- 3/2 normally closed
- Body material
- Anodised aluminium with stainless steel and brass internals
- Seals
- NBR
- Operating pressure
- 10.3 – 34.5 bar (150 – 500 psig)
- Flow factor (Kv)
- From 5.19 to over 12
- Enclosure
- IP65 per IEC 60529
- Operating environment
- Hazardous · indoor
- Mounting
- Any position
- Voltage
- 24 V DC
Series 202 Posiflow
202 Posiflow Proportional Solenoid Valve
Direct-operated proportional valve whose large orifices and compact frictionless build target life-science instrumentation — respiratory therapy, gas chromatography, blood-pressure monitoring and anaesthesia delivery.
Technical data
- Port size
- 1/8" · M5
- Port type
- G ISO 228/1 BSPP
- Control
- Open loop — flow varies with the electrical input signal to the coil
- Function
- 2-way normally closed
- Body material
- Nickel-plated brass · engineered plastics · stainless steel
- Operating pressure
- Vacuum to 150 psig
- Flow factor (Cv)
- Under 0.05 · 0.05 – 0.1 · 0.1 – 0.5
- Hysteresis
- < 5 %
- Repeatability
- < 3 %
- Sensitivity
- < 2 %
- Power
- As low as 1 W
- Enclosure
- IP65
- Approvals
- Applicable CE directives · RoHS
- Voltages
- 6 · 12 · 24 V DC
Series 630
630 Low-Power Piezo Valve
Piezo-actuated proportional valve for analytical and diagnostic equipment where power budget and weight decide the design: 0.004 W, almost no heat dissipation, no wearing parts and a billion-cycle rated life.
Technical data
- Port size
- M5 · flange
- Control
- Open loop — flow proportional to the control signal
- Function
- 2/2 normally closed · 2/2 normally open
- Body material
- Engineered plastics
- Operating pressure
- Vacuum to 10.3 bar
- Flow factor (Kv)
- 0.04 – 0.2
- Power consumption
- 0.004 W
- Service life
- 1 billion cycles · no wearing parts
- Approvals
- ATEX Zone 2-22 · applicable EU directives
- Note
- No inductive peaks when switching, so no circuit protection needed
- Voltages
- 6 · 12 · 24 V DC
Series 610
610 MotorFlowD Proportional Valve
Motorised — not solenoid — proportional flow valve with an integral controller, for plants with no pilot air available. A wear-resistant oxide-ceramic flat rotary slide makes it insensitive to contamination, and it runs on so little power it can be battery driven.
Technical data
- Port size
- 1/4"
- Port type
- G ISO 228/1 BSPP
- Control
- Integral controller with digital control · optional cascaded double-loop control
- Function
- 2/2 normally closed
- Construction
- Wear-resistant flat rotary slide in oxide ceramics — insensitive to contamination
- Flow factor (Kv)
- 1.73 – 5.19
- Enclosure
- IP65 per IEC 60529
- Approvals
- RoHS · IEC 60529
Need an ASCO™ proportional valve?
Send us the catalog number, the port size and the service — we confirm the series, the coil and the body material, and quote it from our Orlando, FL warehouse.