Description
The Crandall 21-152-CSS In-Line Check Valve is a pneumatic control accessory designed to allow airflow in one direction while preventing backflow in the opposite direction. This valve helps maintain stable pneumatic signal integrity by ensuring that pressure and control air flow only in the intended direction within HVAC control tubing. Engineered to Crandall specifications, it supports consistent pneumatic system performance and helps minimize erratic actuation. Ideal for HVAC technicians and controls contractors, it helps maintain proper signal direction and reduce control issues caused by unintended reverse flow.
Key Features
- In-line pneumatic check valve that permits airflow in one direction only
- Helps maintain control air signal integrity in pneumatic tubing
- Compact design for easy installation in 1/4-inch control lines
- Improves overall pneumatic system stability and reduces control errors
- Supports reliable HVAC pneumatic operation and minimizes troubleshooting






