Control Valve
Needle Valve SUS316 Stainless Steel
Needle valve made of stainless steel SUS316 which has excellent anti-corrosivity
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No copper-based metallic material is used in flow paths
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HNBR or FKM is used for the seal rubber material. *Some products are only compatible in the flow path.
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No lubrication is used during assembly.
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Fluorine grease is used as grease, and the product is packaged in a clean room after cleaning with clean air.
Advantages
Needle valve made of stainless steel SUS316 which has excellent anti-corrosivity
External parts are made of SUS316 that has excellent anti-corrosive characteristics
The material of sealing rubber is FKM
The same lock-claws system as tube fitting is adopted
Disconnecting tubing is easier now
All the models come with the oil-free specification
Every part of the product is Food Sanitation Law compliaent
Specifications
| Fluid medium | Air, Water, Other chemicals (Proviso) |
|---|---|
| Maxium operating pressure | 1.0MPa |
| Vacuum | -100kPa |
| Operating temperature range | -5～150℃ (No freezing) |
Warning
*Adhere to the following conditions when the fluid medium is water and other liquids
Surge pressure must be controlled lower than max. operating pressure when using water and other liquids as a fluid medium.
Tap water in Japan, which is soft water (low mineral content) can be used. Carry out the evaluation under an actual operating condition for using other kind of water.
Be sure to place Insert Ring into the tubing edge when the tubing is inserted into Push-in Fitting with water and other liquids as a fluid medium.
The specification above may not be applied, depending on the kind of chemicals or mixed gases used as a fluid medium. Make sure to use PISCO products after verifying their suitability on the user side.
Port size
Tube dia.
| Metric size (mm) | φ4, φ6, φ8, φ10, φ12, φ16 |
|---|
Thread size
| Taper pipe male thread | R1/8, R1/4, R3/8, R1/2 |
|---|
Flow Characteristic Graph
Construction
Type & Price list
Detailed Safety Instructions
Warning
1.Check the chemical resistance before use when the fluid medium is a chemical or mixed gas. Depending on the usage conditions, it may cause damage to the fitting body, disengagement of the tube, or leakage.
2.Do not use the product if it does not satisfy all the conditions listed in the specifications when the fluid medium is water or liquid. It may cause damage to the fitting body, disengagement of the tube, or leakage.
3.When setting the speed of actuators, open the air gradually by turning the needle from the fully-closed position. Otherwise, the actuators can pop or cause unplanned movements. Turn the needle clockwise to close and ounterclockwise to open.
4.When adjusting the flow rate in the equipment, open the air gradually by turning the needle from the fully-closed position. Otherwise, the actuators can pop or cause unplanned movements. Turn the needle clockwise to close and ounterclockwise to open.
5.Be sure to use Insert Ring under the following conditions of use. Not doing so could cause disengagement of tubing and air leakage. ・In case the temperature of fluid medium and environment of use fluctuates intensely ・When using at high temperature
6.Do not use under conditions where the fitting part is subject to shaking or impact. It may cause damage to the product or the screw to loosen.
Caution
1.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.
2.As no Sealock (thread sealant) is coated on taper thread, be careful with the installation. When applying sealing tape or agent on the thread, wrap or apply it leaving 1.5 to 2 thread ridges from the tip of the thread unapplied.
3.The corrosivity and dust emission depend on the operating environment. If there is concern about adverse effects on the machinery or the equipment, evaluate the adoption of the product in advance in accordance with the operating conditions.
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.