Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1203B
The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1203B is a genuine universal speed controller with knob with aluminium-alloy locking cap and 360 degree adjustable tube direction, used to set the speed of a pneumatic cylinder by throttling its air.
- TypeUniversal speed controller
- SeriesPSS
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- AdjustmentKnob with aluminium-alloy locking cap
- Temperature-20 to +70 °C
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1203B
The PSS1203B is a knob-adjustable universal speed controller that throttles air in one direction only, so you can slow a cylinder stroke without choking the supply side. On this B code the passage from the 3/8in PT thread port through to the Dia 12 tube runs wide open, while the reverse flow - air leaving the actuator and heading back to the valve - is squeezed through a brass throttling column. That is meter-in control, the method AirTAC pairs with single-acting, spring-return actuators where you only need to tame the power stroke.
The universal body is the reason to pick PSS over PSL here: the tube connection swivels a full 360 degrees, so you can clock the hose angle after installation without unscrewing the tapered PT thread or breaking its tape seal. Adjustment is by hand knob with an aluminium locking cap - snug the cap down once the stroke looks right and vibration cannot walk the setting away. The handle carries a B marking so a technician reading the machine schematic knows at a glance which way the air is throttled.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1203B Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1203B |
|---|---|
| Type | Universal speed controller |
| Series | PSS |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | 360 degree adjustable tube direction |
| Working pressure | 0 - 1.0 MPa (0 - 10 kgf/cm2) |
|---|---|
| Negative pressure | -750 mmHg (10 Torr) |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Applicable tubing | Soft nylon or polyurethane tube |
| Thread standard | PT (Rc tapered) unless the code says otherwise |
POM release button and chuck, aluminium-alloy guide, stainless spring gasket, NBR O-ring; body brass or PBT depending on the part. A speed controller is not a shut-off valve - a small leak past a fully closed needle is normal. Close it before applying air, and turn it open slowly. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1203B
| PSS | Universal speed controller. |
|---|---|
| 4 / 6 / 8 / 10 / 12 | Tube outside diameter in mm (3.2 mm exists on the mini series). |
| M5 / 01 / 02 / 03 / 04 | Thread: M5x0.8, 1/8", 1/4", 3/8", 1/2" (M3 on the mini series). |
| A / B | A = meter-out (controls flow from the thread port to the tube). B = meter-in. |
| D | Black. Blank = grey. |
Meter-Out or Meter-In?
- check Meter-out (A) is the default. It throttles the air LEAVING the cylinder, so the piston runs against a back-pressure cushion and moves smoothly.
- check Use meter-out on double-acting cylinders - it is the one AirTAC lists as first priority.
- check Meter-in (B) throttles air ENTERING the cylinder. It suits single-acting cylinders and air motors.
- check Meter-in on a double-acting cylinder tends to give a jerky, stick-slip stroke under varying load.
- check Fit the controller at the cylinder port, not at the valve, so the throttled volume is as small as possible.
Where the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1203B Is Used
Spring-return clamp on a carton sealer
Single-acting clamp cylinders pressing lids onto filled cartons need the power stroke gentled, not the spring return. Meter-in B control throttles only the closing direction, so the clamp settles onto the flap instead of stamping it.
Reject kicker on a canning line
A single-acting kicker that tips dented cans off a conveyor at speed benefits from a controlled strike. With the PSS1203B ported at the cylinder, one knob set by the line technician sets the tip-over timing without tools.
Lift-assist pallet gate in a warehouse
Spring-raised safety gates on palletising cells drop hard if uncontrolled. Meter-in throttling of the drop stroke, plus the 360-degree swivel that lets the hose route clear of the guard rail, makes the Dia 12 bore a good match for the larger gate cylinder.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1203B the Right Part?
For meter-in duty on a big-bore line this is near the top of the ladder. The size below it in the same 3/8in thread is PSS1003B (Dia 10 tube); stepping down reduces the hose bore and the free-flow area feeding the actuator, which suits smaller single-acting cylinders but adds restriction on a heavy one. There is no Dia 14 step up - Dia 12 is the largest tube AirTAC offers on the PSS prefix - so if the port is bigger than 3/8in PT, move to the PSS1204B, which keeps the same Dia 12 tube on a 1/2in thread instead.
Fit the controller directly at the cylinder port rather than back at the valve manifold: the throttled air volume shrinks to the cylinder and its short stub of hose, and the response to a knob turn is immediate. Match the tube to soft nylon or polyurethane only; hard tubing will not seal on the collet.
Quick checklist
- ✓ Tube outside diameter matches exactly
- ✓ Thread size and standard match the port
- ✓ Working pressure within 0 - 1.0 MPa (0 - 10 kgf/cm2)
- ✓ Temperature within -20 to +70 °C
- ✓ Meter-out (A) unless you know you need meter-in
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1203B FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), usable under vacuum to -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. It takes Dia 12mm soft nylon or polyurethane tube on a 3/8in PT taper thread, tube side swivels 360 degrees, and the standard finish is grey (add a D suffix for black).
AirTAC treats meter-out as the first priority and this B code fits single-acting, spring-return cylinders, where only the power stroke needs slowing. On a double-acting cylinder, meter-in tends to stick-slip as the load changes because there is no back-pressure cushion; order PSS1203A instead, which throttles the exhaust and keeps the stroke smooth.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard parts are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC Speed Controllers
Request a Quote for Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1203B
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.