302501 Aladco Nu-Check Pneumatic Check Valve

The Aladco 30 / 31 / 32 Series Nu-Check Pneumatic Check Valves are designed specifically for pneumatics. It was the first check valve on the market with both manual and pilot release capabilities. The unique bubble-tight seal keeps devices in "checked" position. If pressure loss or fluctuation should occur, the valve prevents drifting. To release the seal, depress the manual override button or operate the pilot.

An Aladco Nu-Check valve is a normally closed check valve that can be either overridden by air piloting or manually to allow two-way flow. The tightly sealed Nu-Check valves are used on pneumatic devices to stop air release when the device is stopped, which prevents drifting of the device and any attached load.

A typical use of a Nu-Check valve involves combining it with a direction control valve to control air flow from ports of a pneumatic device. With an appropriate combination of direction control valves and other pneumatic components, a cylinder position control system using a Nu-Check can handle both normal position control and standby or safety stop conditions. A combined valve system can have excellent fail-safe and assured control properties.