PVL Locking Device by Schärer+Kunz: Tamper-proof protection for pneumatic valves (e.g., Festo HE). Secures hoses (6–12 mm) without tools in either the open or closed position using a LoTo lock. Durable, chemically resistant PETG for maximum safety.

PVL Interlocks from Schärer+Kunz – Tamper Protection for Pneumatic Valves. Secure your compressed air systems precisely and in compliance with standards during lockout/tagout (LoTo) procedures. Maintenance work on pneumatic systems often carries the risk of unauthorized or accidental tampering. While precisely fitting shut-off devices exist for electrical systems, surface-mounted pneumatic valves have previously represented a security gap. Schärer+Kunz PVL interlocks close this gap. They were specifically developed for pneumatic shut-off valves to effectively prevent unauthorized opening and closing. The advantages at a glance: • Smart two-way locking mechanism: Thanks to an intelligently designed T-recess, the valve can be securely blocked in both the open and closed positions. • Precise fit & universal compatibility: Perfectly matched to widely used Festo shut-off valves of the HE series (HE-2-QS) and identical models. Available for hose sizes 6, 8, 10, and 12 mm. • Tool-free installation: The device is simply placed around the valve shut-off and secured on the back with a LoTo padlock (sold separately). • Maximum visibility: The highly visible safety device serves as an unmistakable visual indicator of the deactivated power source. • Industrial-grade material: Manufactured using 3D printing from robust PETG. This guarantees high impact resistance and excellent resistance to oils, greases, and dilute acids. Technical specifications: • Product type: Safety locking device for pneumatic valves (LoTo) • Compatibility: Festo HE series (HE-2-QS) and equivalent models • Sizes: 6 mm, 8 mm, 10 mm, 12 mm • Material: Impact-resistant, chemically resistant PETG • Installation: Tool-free, secured with standard LoTo padlocks