Vacuum Pad
Fall Prevention Valve
Minimize the pressure drop of other circuit when a workpiece falls down.
Advantages
Minimize the pressure drop of other circuit when a workpiece falls down.
Fall prevention valve prevents the properly picked up work-piece from falling, even when several vacuum pads are without work-piece, causing vacuum lowering of whole system.
It reduces the vacuum lowering for vacuum pads with work-piece.
Specifications
Fluid medium | Air |
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Operating pressure range | Positive pressure:0~0.7MPa/Negative pressure:0~-100kPa |
Operating temp. range | 0~60℃ (No freezing) |
Port size
Port thread size
Metric male & female thread | M3x0.5, M4x0.7, M5x0.8, M6x1, M10x1.5 |
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Taper pipe male & female thread | R1/8, Rc1/8 |
Construction
Type & Price list
The list of shapes and prices lists typical models.
Please refer to the digital catalog for other models.
Option & Maintenance items
Fall Prevention ValveSpring
Spring for maintenance of Fall Prevention Valve.
Fall Prevention ValveValve body
Valve for maintenance of Fall Prevention Valve.
Fall Prevention ValveStopper
Stopper for maintenance of Fall Prevention Valve.
Fall Prevention ValveFilter element
Filter element for maintenance of Fall Prevention Valve.
Detailed Safety Instructions
Warning
1.Since it is not a check valve, it cannot be used to hold a vacuum unless there is a vacuum retentioning function on the vacuum source side.
2.The Fall Prevention Valve is designed to minimise vacuum leakage and to allow multiple vacuum pads to be mounted on one ejector, but should only be used after a suction test has been carried out on the actual application.
3.Under conditions where the vacuum leak from the pad exceeds the required suction flow rate for valve operation, such as when a sponge pad is used, the valve element operates to reduce the suction flow rate, which may cause the workpiece to fall.
Caution
1.Caution for installation and removal of the main unit (1) Use the appropriate tools when installing and removing the product. (2) When installing, refer to the tightening torque shown in the following table and tighten.
2.Note on the thread tightening position of the body (1) When mounting the male thread to the device or holder, tighten the thread using the hexagonal-column of the male thread side and make sure it is not loose. Tighten the thread referring to the tightening torque shown in the following table. (2) When mounting the device or pad on the female thread side, tighten using the hexagonal-column of the female thread side, making sure that it is not loose. Tighten the thread referring to the tightening torque shown in the following table. * When inserting a tool into the hexagonal hole of the pad screw, be careful not to insert the tool too far. It may go through to the inside of the fall prevention valve and cause damage.
3.Since the pressure drop of this product is very small even when the workpiece is not picked up, when checking the pickup state with a pressure sensor, etc., use the product after thoroughly checking it on the actual operating condition. Due to the clogging of the filter element, the pressure drop when the workpiece is not picked up is even smaller, pay close attention to the pressure sensor setting.
Frequently Asked Questions for Vacuum Pad Series
The highest operative temperature limit depends on the pad material. For Urethane rubber's highest operative limit is 60℃, nitrile rubber's 110℃, and fluorine rubber's 230℃. (For the other rubber materials' highest limits, please refer to our catalogue.)
The above highest operative temperature limit is for only instant use. When the product is used under the highest operative temperature limit for a certain length of time, careful attentions are necessary.
Request of spring force change will be treated as a special order request in PISCO. Please contact your nearest sales office.
*) Please note that we cannot always meet a request of changing the spring force.
Yes, they are.
For the standard holder types such as VPC and VPD, the key way machined on the shaft gets fit with the rotation-lock thread so that it prevents the shaft rotation.
For small sized pad holders such as VPMC and VPMD, shaft itself is hexagonally machined which prevents rotation.
It is possible to minimize suction force decline of a vacuum pad by installing a fall prevention valve on multiple vacuum pads even when there are un-sucking pads.
The fall prevention valve, however, does not completely shut down the air circuit and it sucks a little amount of air. Depending on the number of un-sucking pads, required vacuum for the air circuit may not be achieved.
Besides, in case of sucking one work peace by multiple Vacuum Pads, even when the fall prevention valve can reduce vacuum decline, there is still a possibility that the work peace loose the balance so that the sucking Vacuum Pads may be released.
Please refer to the following "pad inner diameter" of the pad rubber to be attached.
Pad size | Pad inner diameter |
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φ1mm |
φ0.5mm |
φ2mm |
φ0.6mm |
φ3mm |
φ0.8mm |
φ4mm |
φ1.2mm |
No pad rubber (pad holder only) |
φ1.6mm |
*) Adsorbable up to this pad diameter
The inner diameter of the pad holder itself of the Air Pincette is φ1.6 mm, but since the pad diameter φ1 to 4 mm mentioned above has a smaller pad inner diameter than that, it is possible to adsorb workpieces of φ1.6 mm or less as shown in the above figure.
The pad inner diameter of the pad size φ6, 8 mm is larger than the pad inner diameter of the holder, so it is suitable for φ1.6 mm or more.
It is a dimensional calculation to the last, and may differ depending on the workpiece to be adsorbed. Ultimately, we ask you to judge the actual machine.
There are two ways of measuring pressure, absolute pressure and gauge pressure.
Absolute pressure
Absolute pressure is zero-referenced against a perfect vacuum.
It is commonly used to measure flow rate.
When indicated, "abs" is inserted following the unit, for example 10 kPa abs.
Gauge pressure
Gauge pressure is zero-referenced against ambient air pressure.
It indicate how much pressure per 1cm2 is against the ambient air pressure. It is commonly used for indication of manometer. When the pressure is over the ambient air pressure, it is called "positive pressure" and when it is under the ambient air pressure, it is called "negative pressure."
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.