Double Check Valves
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.
Product Overview
The patented Aladco® Dual-Check® valve is a parallel normally closed set of pilot operated check valves in a single package that is designed to stop and hold a cylinder in position in the event of loss of pressure. The tightly sealed ball checks in the Dual-Check® valves are used on pneumatic devices to prevent air from flowing from both sides of the device towards the ball checks upon loss of pressure from a directional control valve.
The Dual-Check® valve is available with both a vented manual override and without. The vented manual override allows the user to exhaust both sides of the device simultaneously to minimize movement of the device as pressure is being relieved. The 62 Dual-Check® valve series without the manual vent are suitable for clean-room environment.
A typical use of a Dual-Check® valve involves combining it with a directional control valve to stop a device upon loss of air pressure. With an appropriate combination of directional control valves and other pneumatic components, a cylinder position control system using a Dual-Check® valve can accommodate for both normal position control as well as rapid motion stoppage and position holding. Two example schematics are shown to illustrate potential uses of the Dual-Check® valve.
Aladco® highly recommends the use of spring centered 3 position 5 way centered vented valves for directional control with the use of Dual-Check® valves.
Features
- Superior, self-cleaning ball and seat seal provides long product life
- Exceeds ANSI Class VI Leak Standard (bubble tight)
- Body is made of high strength, lightweight, anodized 6061 aluminum alloy
- Variety of porting options
- Designed for use with lubricated or non-lubricated air systems
- Tamper resistant with no required maintenance
- Prevents load drift and provides rapid stopping of load
- Ability to provide multiple position control
- Patented and Made in Waukesha, Wisconsin USA
- Standard 3-year warranty
Dual-Check® Pneumatic Check Valve Dimensions
Additional Notes:
- MTTF is over 100 million cycles for Buna-N seals and over 40 million cycles for Viton® seals
- NPTF Ports conform to ASME B1.20.1-2013 Pipe Threads, General Purpose (Inch)
- BSPP (G) Ports conform to ISO 16030:2003: Pneumatic fluid power – Connections – Ports and stud ends
- Operating pressure is 15 to 150 psi
- Operating temperature 30° to 150°F
- Stainless steel 303 is no longer an available option for Dual-Check® configurations – please see our line of Clean-Check® pneumatic valves for stainless steel valve options
Model Ordering Information
Product Configurator
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.
Additional information
| Model Type | 60 : Dual-Check Valve® – Extended Vented Manual Override, 61 : Dual-Check Valve® – Flush Vented Manual Override, 62 : Dual-Check Valve® – No Manual Vent |
|---|---|
| Inlet-Outlet Port Size | 32 : 10-32 UNF Port, 32 : M5 ISO Metric Port, 12 : 1/8 Port, 25 : 1/4 Port, 38 : 3/8 Port, 50 : 1/2 Port, 75 : 3/4 Port |
| Seal Type | 01 : Buna-N Seals, 02 : Viton® Seals |
| Thread Class | [blank] : NPTF Thread Class, [blank] : UNF Thread Class, BSPP : G BSPP Thread Class, M5 : ISO Metric Thread Class |
Technical & Application Files
Dual-Check® Information • Dual-Check® Double Acting Cyl Example • Dual-Check® Full Circuit Diagram • Dual-Check® CAD Files