ISV-3-8 Festo Vacuum Security Valve

$ 44.00

G3/8 vacuum security valve designed to maintain system vacuum if suction cups are uncovered. Features an operating pressure range of -0.95 to 0 bar and supports ejector pulses up to 8 bar.

SKU Festo-33971 Category
Vacuum security valves

ISV-3/8 Festo Vacuum security valve

Model Identifier ISV-3/8
Official Part Number 33971
GTIN Standard 4052568067793

Technical Overview

The Festo ISV-3/8 is a high-performance vacuum security valve designed to maintain system vacuum in the event of suction cup failure or detachment. Built with a robust wrought aluminium alloy housing and a POM float, it operates across a pressure range of -0.95 to 0 bar. This screw-in component is optimized for compressed air applications and features moderate corrosion resistance for reliable industrial automation performance.

Key Features

  • Suitable for ejector pulse up to 8 bar
  • Optional mounting position for flexible installation
  • Moderate corrosion resistance (CRC 2)
  • VDMA24364-B2-L LABS (PWIS) conformity
  • Durable stainless steel mesh filter integrated

Minimal required suction volumetric flow of 1.5 l/min at -0.5 bar suction pressure

Technical Specification Matrix

ParameterValue
SizeG3/8
Suitable for ejector pulse ≤8 MPa
Suitable for ejector pulse8 bar
Mounting positionoptional
Symbol00991481
Operating pressure (MPa)-0.095 MPa ... 0 MPa
Operating pressure (bar)-0.95 bar ... 0 bar
Required suction volumetric flow at -0.05 MPa (-0.5 bar, -7.25 psi)1.5 l/min
Operating mediumCompressed air to ISO 8573-1:2010 [7:-:-]
Corrosion resistance class CRC2 - Moderate corrosion stress
LABS (PWIS) conformityVDMA24364-B2-L
Ambient temperature-10 °C ... 60 °C
Product weight33 g
Type of mountingScrew-in
Pneumatic connection, port 1G3/8
Pneumatic connection, port 2G3/8
Material springHigh-alloy steel
Material filterWrought aluminium alloy Stainless steel mesh
Material housingWrought aluminium alloy
Material hollow boltWrought aluminium alloy
Material floatPOM

Industrial Applications

1. Adaptive Vacuum Gripper for Mixed-SKU Palletizing

Integration of ISV-3/8 valves into large-area foam or suction cup grippers used in logistics centers. These valves automatically isolate individual G3/8 suction lines that land on gaps between boxes or overhangs, ensuring the remaining active cups maintain full holding force.

Problem Solved

Prevents system-wide vacuum collapse when a robot gripper handles variable layer patterns or mixed box sizes, where some suction cups inevitably fail to contact a surface (air gaps).

G3/8 pneumatic connectionOperating pressure -0.95 barSwitching flow 1.5 l/minVacuum securityEjector pulse compatibility

2. Automated Unloading of Nested Laser-Cut Metal Parts

Use on spider grippers for unloading sheet metal parts with complex internal geometries (cutouts/windows). If a suction cup lands on a hole, the ISV-3/8 detects the airflow surge and snaps closed, allowing the robot to lift the part using the remaining sealed cups.

Problem Solved

Eliminates downtime caused by dropped parts when suction cups land on 'voids' or cutouts in nested metal sheets, which would otherwise drain the vacuum generator's capacity.

CRC 2 corrosion resistanceHigh-alloy steel springProduct weight 33 gScrew-in mountingISO 8573-1:2010

3. Heavy-Duty Sack Handling in Dusty Environments

Application in vacuum lifters for 25kg+ porous paper or woven sacks (cement, polymers). The valve maintains vacuum even if a cup disconnects due to bag wrinkling. The 8 bar ejector pulse capability is utilized to rapidly release the bag and purge dust from the internal stainless steel mesh filter.

Problem Solved

Mitigates the risk of dropping heavy loads due to leakage from bag porosity or surface wrinkles, while preventing filter clogging common in powder handling applications.

Suitable for ejector pulse 8 barMaterial filter Stainless steel meshPOM floatAmbient temperature -10 to 60 °CWrought aluminium alloy housing

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