About Philadelphia Safety Devices

Philadelphia Safety Devices (PSD) has been designing and manufacturing reusable explosion relief doors since 1975.

For nearly five decades, PSD has helped industrial facilities protect equipment, personnel, and production from the destructive effects of overpressure events. Our doors are engineered, manufactured, and supported in the United States, and we have thousands of installations operating successfully around the world.

Our customers range from global manufacturers to specialized processing facilities, including companies such as Anheuser-Busch and Xerox Ireland. Across industries and continents, PSD doors have earned a reputation for durability, reliability, and long service life. 

Get to Know PSD

Work with the team behind thousands of successful installations worldwide.

A Different Approach to Explosion Protection

A PSD explosion relief device is not a disposable panel. It is a real, reclosable mechanical door.

Each door is designed to maintain a positive seal during normal operation and open only when internal pressure reaches a precise, predetermined set point. Activation pressures can be calibrated from very low thresholds starting at 6 inches of water column up to 30 inches of water column, depending on your application.

When pressure is relieved, the door remains open until it is manually closed. There is no tearing, no destruction of components, and no need for replacement parts. You simply re-latch the door and return to operation.

By eliminating time-consuming rupture disk replacement, PSD doors help reduce downtime and keep production moving.

Engineered for Your Process

No two vessels are exactly the same. That is why PSD doors are engineered to match your specific process conditions and equipment configuration.

Our explosion relief doors are designed to comply with the latest NFPA 68 and FM requirements, helping facilities meet safety standards while minimizing the impact of overpressure events.

Whether installed on dust collectors, silos, cyclones, or process vessels, PSD doors are built for long-term performance in demanding industrial environments.

Built in the USA. Trusted Worldwide.

Since 1975, PSD has focused on one mission: delivering reliable, reusable explosion protection that protects both people and production.

From coast to coast and across international markets, our doors continue to perform year after year. That longevity is not accidental. It is the result of careful engineering, quality manufacturing, and a commitment to solving real-world industrial safety challenges.

When you choose Philadelphia Safety Devices, you are choosing a proven solution designed to last.