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FAQ (Frequently Asked Questions)
The control direction of Speed Controller is different.
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.
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.
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
Because Push-in fitting seals outside diameter of tube by an elastic-sleeve (rubber seal), there may be a factor causing leak, such as scratches, deformation or jamming of contaminants.
The fittings are designed for pressurized air piping, then they cannot be used for the circuit of gas or liquid which becomes a risk upon leakage, or for an inspection equipment which becomes easily affected by even slight leak.
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