2-stage Speed Controller

RoHS2 Compliant

Industry's First!
It enables same control as the cylinder with shock absorber. (Patent no. 5578502)

  • PBT is used for the main resin parts. PBT: A standard resin material that is ideal for general environments.
Seal rubber
  • NBR is used for the seal rubber material. NBR: A material generally used as a sealing material. Please note that it is inferior in ozone resistance.
  • HNBR is used for the seal rubber material. HNBR: A material with improved ozone resistance by adding hydrogen to NBR. Ideal for low-concentration ozone countermeasures.


Industry's First!
It enables same control as the cylinder with shock absorber. (Patent no. 5578502)

Shock absorber is not required.

Two-stage exhaust flow rate adjustment is realized. By using 2nd stage exhaust speed to be as cushion (brake), controlling like a shock absorber is possible.

Speed control (EX1), shock absorbing (cushion) strength (EX2), and start timing of shock absorber (TIM) are separately adjustable.

e.g. Can be reduced the shock to 1/9 while keeping the same cycle time.

Durability is about 3 times of a cylinder mounting type shock absorber.

Durability of BJSU is more than 3 times of a normal shock absorber, which is directly mounted on a cylinder. Thus, reducing the cost and the frequency of the maintenance are possible.

Large flow type of tube size : ø4, ø6 and ø8mm were newly added.

Enables to ensure larger flow rate with same tube size as conventional type.

Two fixing methods are selectable.


Fluid medium Air
Operating pressure range 0.2~1.0MPa
Operating temp. range 0~60℃ (No freezing)

Port size

Tube dia.

mm size(mm) φ4, φ6, φ8, φ10
inch size φ5/32, φ1/4, φ5/16, φ3/8

Flow Characteristic Graph

Type & Price list

Option & Maintenance items

2-stage Speed ControllerBracket

Fixing bracket for 2-stage Speed Controller.

Detailed Safety Instructions


1.When adjusting the speed of the cylinder, refer to the speed adjustment method in the digital catalog or instruction manual. If the correct procedure is not followed, there is a risk of the cylinder moving violently.


1.When adjusting the flow rate of the equipment, the needle should be turned to open gradually from the fully closed position. If the needle is in open position, a high flow rate will be instantly applied to the equipment and there is a risk of damage to it.

2.Leakage is allowed for the control flow even when the needle is fully closed position and should not be used in such a way that zero leakage is required.

3.Note that while air remains in the cylinder during the second speed transfer, the cylinder thrust will be reduced due to back pressure.

4.Air leakage around the cylinder may affect the speed setting.

5.Do not block the exhaust ports during the adjustment and operation.

6.In the following cases, be aware that the set-up second speed shifting to work as shock absorbing may not function properly as desired. (1) After the residual pressure in the cylinder is released, if the cylinder position changes due to its own weight, etc., the pseudo shock absorbing work by second speed shift may not function due to air shortage in the cylinder in the first operation after shutdown when air is applied again. * BJSU uses the air in the product or cylinder as conventional speed controller does. The above may occur in the first operation without back pressure. (2) Depending on the cylinder performance (piston sliding property, cylinder airtightness), pseudo shock absorbing work by second speed shifting may not function satisfactorily: the speed shifting (shock absorbing start) point is possibly deviated.

7.The starting position of the speed shifting (pseudo shock absorbing work) may vary from the default setting depending on the operating conditions (quality of the fluid used, standby time, pressure fluctuation, etc.). The starting position of the speed shifting (pseudo shock absorbing work) should be set with sufficient margin under individual operating conditions, and should be reset if necessary.

8.Depending on the setting of EX1 or EX2 and various conditions such as the supply air pressure, the back pressure of the exhaust air may cause the main valve to chatter momentarily and generate abnormal noise.

9.In the exhaust side control mechanism, the material of the needle mating part is resin. If the needle is tightened with more torque than required, the resin mating part may be deformed and the flow characteristic may change.

Inquiries about this product

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