Parr gage block assemblies combine the functions of an Inlet / Outlet Valve, a Pressure Gage, and a Safety Rupture Disc into a compact assembly which can be attached to the head of any small vessel with limited head space using a connecting tube. There is a threaded socket in the block for a gas connection with a pressure hose or tubing using a type “A” coned pressure fitting. Coned fittings are also used on the thick-walled tube which connects the block to the pressure vessel. The valve in this assembly controls the gas flow into the vessel and the gage shows the pressure in the vessel when the valve is closed. A rupture disc with a burst rating matched to the gage is installed in the block
These gage block assemblies are made in two styles which differ only in the size of the pressure gage and the size of the tube connection to the pressure vessel. The smaller 4310A Gage Block Assembly is usually furnished with a 3-1/2 inch diameter pressure gage and includes a 3-inch long connecting tube with type “A” coned fitting. This assembly is normally installed on pressure vessels up to 600 mL.
