SPI Critical Point Drying Apparatus

The stand pillar which supports the pressure vessel is also the safety blow- off valve. The top of the valve screws into the pressure vessel and is sealed with a nitrile/metal gasket. The exit of the valve is a small hole in the side of the pillar. In some parts of the world, this is called the "rupture disc".

The valve is preset to "blow" if the pressure in the chamber should exceed 1850 psi. Once the valve has blown, the 'pressure fuse' or diaphram rupture disc must be replaced. A spare rupture disc is included with the each SPI CPD apparatus as shipped.

Replacing the rupture disc

The rupture disc or pressure fuse is a small nickel domed disc. To replace it proceed as follows:

1. Remove the body of the apparatus from the top of the blow- off valve stem.
2. The upper part of the blow-off valve can be unscrewed using two wrenches (turn counterclockwise).
3. Remove the copper annulus in the lower part of the valve and take out the "blown" or "damaged" rupture disc (or "fuse" in some countries)..
4. Replace the rupture disc, copper ring, and screw on the upper part of the valve securely.

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