Control Valve
2-stage Speed Controller
Industry's First!
It enables same control as the cylinder with shock absorber. (Patent no. 5578502)
Advantages
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.
Specifications
| 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
Construction
Type & Price list
Option & Maintenance items
2-stage Speed ControllerBracket
Fixing bracket for 2-stage Speed Controller.
Detailed Safety Instructions
Warning
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.
Caution
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.
Frequently Asked Questions for Control Valve Series
The control direction of Speed Controller is different.
Meter-out Control
Engraving A (A□) on needle head and equipped with white color lock nut for PISCO Speed Controller.
It is mainly used for double-acting cylinders*.
It is called Meter-out control because it controls cylinder speed by regulating air flow of which exhausted from the cylinder.
Meter-in Control
Engraving B (B□) on needle head and equipped with black color lock nut for PISCO speed controller.
It is often used for single-acting cylinders*.
It is called Meter-in control because it controls cylinder speed by regulating air flow of which supply to the cylinder.
* Double-acting cylinder and Single-acting cylinder
Double-acting cylinder is designed to input pressure air to both sides of the piston, and reciprocated by force of air. Attach one piece each of Meter-out type (A) to the both cylinder ports and control extend and retract movement individually.
Single-acting cylinder is designed to input pressure air only to one side of the piston, and use force of loads or built-in spring to return. Usually attach one piece of Meter-in type (B) to the supply port of cylinder and regulate the cylinder speed of only one direction.
In general, movement of Meter-out Control is much more stable.
Meter-in Control adjusts air flow of which to supply compressed air to the cylinder.
In this circuit, pressure level of exhaust side is atmospheric pressure and it makes cylinder unstable because pressure level of inside cylinder is gradually pressurized from atmospheric pressure.
Meter-out Control fills up compressed air to both supply and exhaust side of the cylinder which stabilize movement of the cylinder.
【Movie】Meter-out/Meter-in
"A" is the meter-out control and "B" is the meter-in control.
For the difference between meter-out and meter-in, see FAQ "What is the difference between meter-out control and meter-in control of speed controller?".
Double-acting cylinder is a type of the cylinder which has ports at both side of piston to allow air in. To operate double-acting cylinders, meter-out control Speed Controller is typically used.
When operate cylinder, meter-out control Speed Controller does not throttle supply air (free flow), but throttles only exhaust air at the preset flow rate. Speed controlling can be executed stably and safely in this way. On the other hand, single-acting cylinders, which return to the "home" position by the force of spring, usually use meter-in control.
【Movie】 Meter-out control and meter-in control
No. The driving force of actuators like air cylinders is depending on the degree of pressure, thus you have to decompress the supply air by regulator.
Throttling supply flow by flow control valve like Speed Controller only slow down the moving speed of cylinder but it does not concern to the driving force.
PISCO's Throttle valve and Speed controller are both categorized as control valves, besides the appearances are similar.
Differences in uses and purposes
Speed controller : Aiming to speed control of an actuator (mainly a cylinder) at the end of the plumbing.
Throttle valve: Aiming to control air flow rate at various points of plumbing.
Speed controller is mainly used to control air speed, while Throttle valve is to control air flow rate.
How to distinguish
No knurling on the outer periphery of the knob >>> Speed controller
Knurled outer periphery of the knob >>> Throttle valve
Difference in function
Speed Controller: There is a throttle valve and a check valve inside, and it is possible to control only the flow in a fixed direction (free flow when flowing in the opposite direction).
Throttle Valve: Since it does not have a Check Valve and has a structure with only a Throttle Valve, it is controlled in the same way regardless of which air is flowed.
It can be distinguished from the marking on the main body.
The front is the marked side and the rear is the side without marking.
The direction of the air flow is through from right to left in the below picture and illustration.
The above engraved circuit diagram indicates "Speed Controller".
To be more specific, the symbol encircled in orange is Throttle Valve (valve that throttles, adjusts air flow) and encircled in red is check valve (valve that allows air to flow in by only one direction).
Control direction is determined by the direction of check valve*.
*) Direction of free flow is from right to the left when symbol is ">", to the direction to be wider.
When free flow of entering air (supplying air to a cylinder) is required,
which is Meter-out control, set the direction of air and the check valve as same as Illustration 1. (Return air, which is exhausted air from the cylinder, is controlled.)
On the other hand, when free flow of coming out air from a cylinder is required,
which is meter-in control ,set the direction of air and the Check Valve as same as Illustration 2.(Entering air which is supplied to the cylinder is controlled.)
Exchange the front and back side from the position illustrated in 1, and meter-in control can be made.
The construction of Speed Controller Union Straight type is as mentioned above. Meter-in and meter-out control should be chosen according to the direction of plumbing.When installing a Speed Controller in a plumbing, make sure the direction of air flow
Low cracking pressure type is an optional specification of Speed Controller which suits for low pressure region of spring-return cylinder with the small diameter which is a kind of single acting cylinder.
Differences from the standard type are the followings:
The difference in check valve cracking pressure
Low cracking pressure type: 0.02MPa
Standard type: 0.05MPa
How to distinguish
Engraving (□K) on needle head.
*)
(AK): Meter-out Control, Low cracking pressure type
(BK): Meter-in Control, Low cracking pressure type
The spring-return cylinder
Spring-return cylinder equips spring in the cylinder body of one moving direction side.
Use the compressed air to create a driving force in one direction with pushing against the spring and return to the home position by the force of spring when exhaust compressed air. (Spring-return cylinder is typically small sized. There is inverted structure of reciprocating motion too.)
Single -acting cylinders such as spring-return cylinder, loads are added to an exhaust and influence on the motion depending on the pressure balance between working pressure at low pressure region and cracking pressure of Speed Controller. It also retard the responsiveness if piping from valve is lengthy.
Low cracking pressure type has developed to cope with these factors by making cracking pressure weak and improve responsiveness. Operating pressure range of the low cracking pressure type is restricted within 0.05 to 0.5MPa.
It can also be used for vertically movable cylinders.
However, please note that if the work piece is too heavy, the cylinder will be overloaded and adjustment will become unstable.
A Check Valve, clack valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through in only one direction. In PISCO products lineup, Check Valve (with push-in fitting, etc.) is available in Control series.
Speed Controller and Throttle Valve tolerate some leakage. They don't shut off air completely. Please avoid to use these under the circumstance where leakage is not allowed at all.
Since 2-stage Speed Controller is meter-out controlled, it is not possible to control the direction in which air is applied with a single-acting cylinder.
(It is not impossible to control the speed in the return direction with a spring, etc.)
2-stage Speed Controller is not compatible with clean rooms because the exhaust method is open to the atmosphere (air is exhausted to the air as it is), but if you understand this point, clean room packaging (fluorine grease) will be available as custom-made.
To tighten Lock nut, designated way is finger tight so that the Lock Nut is knurled. There is no set appropriate tightening torque.
If a tool is used to tighten it, be careful for over-tightening which will damage a product.
Since the Slot-head Speed Controller does not have a lock function, the needle may rotate and the flow rate may change when used in a place where there is excessive vibration or impact such as strong impact from the cylinder or vibration of the device.
We conducted the following vibration tests and found no problems such as changes in flow rate.
Vibration test (reference)
Acceleration：49m/s2（5G）
Frequency: 10Hz-150Hz
Cycle: 1 oct / min (10 → 150 → 10Hz)
Number of sweeps: 5 times
Generally, the G for products transported by truck is about 3G. Imagine 5G as the maximum G level on a product when you drive on a highway.
If you are considering using it with excessive vibration more than mentioned above, use the speed controller standard with locknut.
Our "Check Valve series" are designated only for air, but "Check Valve PP for Low Operating Pressure" can flow water (fluid) as well as air. Please check the specification before actual use.
For stainless steel metal parts, there are corrosion-resistant SUS303 equivalent type and PP type (SUS304).
Inquiries about this product
It is also possible to suggest products suitable for various conditions such as applications and functions. Please feel free to contact us or visit the nearest sales office.
The following are frequently asked questions. Please check before making inquiries.
