Instant response even at low pressures

Now, you can protect vessel and building contents more effectively, and put an end to expensive, single-use explosion vent and rupture disk replacement costs at the same time.

By installing PSD explosion relief doors, you eliminate the time and cost of membrane replacement forever. Because unlike single-use metal vents, PSD gives you a real door. A door that maintains a positive seal until it opens, under precise and predetermined pressure conditions. A door that, once opened, remains open until you close it – with little force and no tools.

The PSD explosion relief door is preset to open at any set point from 7-42” WC +/- 2”. This kind of pressure sensitivity is simply impossible to achieve with most explosion relief devices. And, because the door opens at lower pressures, it relieves potentially dangerous situations faster.

The PSD explosion relief door is preset to open at any set point from 7-42” WC +/- 2”. This kind of pressure sensitivity is simply impossible to achieve with most explosion relief devices. And, because the door opens at lower pressures, it relieves potentially dangerous situations faster.

Patented latching system provides improved performance.
The key to the PSD explosion relief door is a unique diaphragm action, which triggers the magnetic latching system (United States Patent 4,207,706, other pats. pend). Built directly into the door itself, the latching assembly opens as soon as the preset pressure is reached.

The door itself is a strong, yet lightweight (less than 1-½ lb/sq ft for the aluminum panels and 2-½ lb/sq ft for the panel with arms attached), honeycomb aluminum structure. Because of the door’s strength, it deflects uniformly, providing pressure relief over its entire area. Because of the door’s lightweight and low inertia, it provides millisecond response time. As a result, PSD explosion relief doors are exceptionally effective for high dp/dt conditions.

Engineered for a wide variety of installations.
PSD explosion relief doors can be used to protect dust collectors, silos, spray dryers, ducts, rail cars, bucket elevators and most other structures with potentially explosive atmospheres, and low design pressure ratings.
   
The key to the simple reliable operation of the PSD explosion relief door is a proprietary, patented latch and actuator assembly.
The key to the simple reliable operation of the PSD explosion relief door is a proprietary, patented latch and actuator assembly. Under normal conditions, the latch handle is in the closed position shown. The latch bar provides a uniform spring load to keep the door seals compressed. Under overpressure conditions, the door begins to deflect, overcoming the spring preload. Within an extremely small movement, the actuator moves the magnetic target away from the permanent magnet. Once free of the magnetic force, the latch handle is free to revolve around its pivot, releaseing the door. Because of the strength of the honeycomb structure, the entire door moves as an unit, releaseing all latches simultaneously. 
   

Unlike scored membranes which, by design, are much more sensitive to overpressure at their center than their perimeters. PSD doors are equally sensitive across the entire surface. The door opens using a diaphragm action, providing the full surface area for pressure relief.

Doors have flush inside surfaces to minimize material buildups, and they can be supplied with aluminum, stainless steel or special alloy facing.

Other design and manufacturing features include:

• service up to 1000o F
• stainless steel latch springs and hardware.
• nylon sleeves on all critical moving parts to ensurereliable reaction.
• frames can be welded or bolted (4” centers) to housing or vessel.
• fingertip manual release
  gasket seals for a variety of atmospheres
• self-leveling latch seals.
The unique PSD latch system shown here in the open position
 

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