The Dual-Check® valve, designed specifically for pneumatics, is a patented Aladco® product.  It is the only parallel check valve that can be manually overridden with an internally plumbed air pilot or a single override button that releases both sides at once.

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Aladco® started in 1986 when our parent company, Aladdin Engineering and Manufacturing, Inc., saw a gap in the market for a versatile, reliable pilot operated pneumatic check valve with manual override capabilities. For over three decades, our engineers have designed and patented top-of-the-line proprietary products like our Nu-Check®, Dual-Check®, Clean-Check®, and Equa-Check® pilot operated pneumatic check valves.

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60 : Dual-Check Valve – Extended Vented Manual Override, 61 : Dual-Check Valve – Flush Vented Manual Override, 62 : Dual-Check Valve – No Manual Vent

A typical use of a Dual-Check® valve involves combining it with a direction control valve to control air flow from both ports of a double acting cylinder. With an appropriate combination of direction control valves and other pneumatic components, a cylinder position control system using a Dual-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.

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The U.S. list price displayed is for individual quantities of 1-24. Contact your Aladco® Distributor or Aladco® for volume pricing of 25 or more valves.

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Aladco® double check valves use two check valves in the same body. Double check valves trap air in both sides of a cylinder or actuator and the pilot operation automatically pilots the opposite check allowing the cylinder to move. Our patented manual override relieves the air on both sides of the cylinder or actuator. One manual override button creates a better-controlled and safer release of air because it relieves air from both sides of the cylinder simultaneously.

Applications can involve work holding, clamping and positioning, and moving parts or equipment components in a wide variety of manually operated and automated machinery. Specific circuit design and switching valve selection are application-dependent. Your Aladco® distributor or Aladco® can be contacted to provide assistance with answering application questions.