» ASCO™ · Supplied by ACD America
ASCO™ Pinch Valves
The valve that never touches what it controls: the mechanism pinches a flexible tube from the outside, so the fluid path is the tube and nothing else — no seat, no stem, no dead volume, no cross-contamination.
Sizing a valve? Estimate flow, pressure drop or Cv/Kv with our free calculator.
Open the Flow Calculator →A pinch valve inverts the usual problem. In every other valve the fluid meets machined metal, seats and packing, and the engineering question is how to keep the two compatible. Here the fluid meets a length of tubing and nothing else — so compatibility becomes a tubing choice, cleaning becomes a tube change, and there is no crevice for product to sit in between batches.
That is why the line is built around the tube, not the body: silicone, C-Flex and Tygon in 55–80 Shore A, gamma-radiated, in sizes from 1/4" to 1" OD. Actuation is the second decision — compressed air on the 273/373, a direct-acting solenoid on the 284/384 for silent operation in clinical equipment, or a stepper motor on the S170/S370 when you want to modulate rather than switch.
Select your valve
ASCO™ pinch 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.
273 / 373
273 and 373 Pneumatic Pinch Valves
Air-operated pinch valves — 273 in 2-way, 373 in 3-way — that keep high-purity liquids intact: the mechanism is sealed away from the tube, so the fluid only ever touches the flexible tubing.
- Tube 1/4" – 1"
- To 90 psi (6 bar)
- Silicone · C-Flex · Tygon
284
284 2-Way Solenoid Pinch Valve
Direct-acting solenoid pinch valve with an aluminum body and hermetic separation between mechanism and fluid. Silent operation and bi-directional flow make it the choice for clinical and analytical instrumentation.
- Vacuum – 150 psig
- Bi-directional
- IP65
384
384 3-Way Solenoid Pinch Valve
The 3-way member of the solenoid pinch family, in aluminum, for highly aggressive or high-purity liquids. Same hermetic separation: the actuator never sees the fluid.
- 3/2 universal & NC
- Vacuum – 150 psig
- Corrosive service
S170 / S370
S170 and S370 Stepper-Motor Pinch Valves
Stepper-motor pinch valves — S170 in 2-way, S370 in 3-way — that cut flow with no turbulence and no dead volume, with bi-directional flow. With the right electronics they run on/off, on an analog input or from a potentiometer.
- Stepper motor
- No dead volume
- Tube to 90 Shore A
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 273 / 373
273 and 373 Pneumatic Pinch Valves
Air-operated pinch valves — 273 in 2-way, 373 in 3-way — that keep high-purity liquids intact: the mechanism is sealed away from the tube, so the fluid only ever touches the flexible tubing.
Technical data
- Valve type
- 2-way normally open and normally closed · 3-way dual
- Operation
- Pressure operated (compressed air)
- Body material
- 2-way: anodized aluminum and stainless steel · 3-way: anodized aluminum
- Tube OD range
- 2-way: 1/4", 3/8", 1/2", 3/4", 1" · 3-way: 1/2"
- Tube material
- Silicone · C-Flex 374 · C-Flex 082 · Tygon
- Tube hardness
- 55 – 80 Shore A (gamma radiated)
- Media pressure in the tube
- Up to 90 psi (6 bar)
- Air pilot pressure
- 70 – 145 psi (4.8 – 10 bar)
- Ambient temperature
- 32 – 104 °F (0 – 40 °C)
- Options
- Safety guard · manual override · open/closed position detection
Series 284
284 2-Way Solenoid Pinch Valve
Direct-acting solenoid pinch valve with an aluminum body and hermetic separation between mechanism and fluid. Silent operation and bi-directional flow make it the choice for clinical and analytical instrumentation.
Technical data
- Operation
- Solenoid, direct acting
- Body material
- Aluminum
- Function
- 2/2 normally closed · 2/2 normally open
- Operating pressure
- Vacuum to 150 psig
- Enclosure
- IP65 · IP40
- Operating environment
- Indoor
- Features
- Pinch mechanism eliminates turbulence on shut-off · silent operation · removable and rotatable coils · manual pulse control to fit tubes · bi-directional flow
- Coil voltages
- 12 V DC · 24 V DC 50/60
Series 384
384 3-Way Solenoid Pinch Valve
The 3-way member of the solenoid pinch family, in aluminum, for highly aggressive or high-purity liquids. Same hermetic separation: the actuator never sees the fluid.
Technical data
- Operation
- Solenoid, direct acting
- Body material
- Aluminum
- Function
- 3/2 universal · 3/2 normally closed
- Operating pressure
- Vacuum to 150 psig
- Operating environment
- Corrosive · indoor
- Coil voltages
- 12 V DC · 24 V DC 50/60
Series S170 / S370
S170 and S370 Stepper-Motor Pinch Valves
Stepper-motor pinch valves — S170 in 2-way, S370 in 3-way — that cut flow with no turbulence and no dead volume, with bi-directional flow. With the right electronics they run on/off, on an analog input or from a potentiometer.
Technical data
- Operation
- Stepper motor — on/off, analog input or potentiometer control with suitable electronics
- Body material
- Anodized aluminum
- Function
- S170: 2-way · S370: 3-way
- Pinching device
- POM (reinforced acetal copolymer)
- Internal components
- Brass and stainless steel
- Tube hardness
- Elastic tubing up to 90 Shore A
- Tubing
- Not supplied with the valve — it is the only part in contact with the fluid
Need an ASCO™ pinch 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.