Solids Charging Systems

One of the modifications most frequently requested is a port or other means to feed liquids, solids, or slurries into the vessel without removing the head. This can be done in various ways.


A143VB Solids Charging Ball Valve
A143VB Ball Valve

Ball Valve Solids Charging Ports

A ball valve with a 3/8″diameter opening can be installed on any one liter or larger vessel and used in conjunction with a high pressure pipette for injecting slurries under pressure. These are opened or closed with a quarter turn of the handle. Larger diameter valves are available for 1 gallon and larger vessels. These ball valves will withstand the full pressure developed in a reactor at moderate temperatures, but their pressure rating falls off rapidly at temperatures above 100 °C.

Solids Charging Ports
Part No.Nominal SizeOrifice Diameter, in.
A143VB1/4″ NPT (F)0.250
A132VB3/8″ NPT (F)0.375
396VBAD1/2″ NPT (F)0.406

Capped Openings

A capped opening in the head of a reactor can serve as a convenient solids charging port, offering the largest possible diameter and a significantly shorter passage than a ball valve. A male connector with a cap is usually used to close the opening. These will have a reliable metal to metal seal and the ability to withstand the full temperature and pressure for which the vessel is rated. Tubing can be connected to the fitting, but this type of connector is normally used only where solids or slurries will be added at atmospheric pressure.

Capped Openings
ReactorAvailable Fitting Sizes
Mini1/4″ NPT
1 & 2 Liter3/8″ or 1/2″ NPT
Gallon and Larger3/8″ to 1″ NPT

External Catalyst Addition Devices

An external catalyst addition device in the head of a reactor can serve as a convenient solids charging port at atmospheric pressures. The body of this device is machined with an internal taper to aide in the delivery of the solids into the vessel.  It has a convenient screw cap closure. The standard seal material is FKM which will accommodate temperatures to 225°C.  Alternate FFKM seals are available for use to 300°C.  These devices are offered in a variety of sizes to complement our reactor volumes.

External Catalyst Addition Devices
ReactorAvailable Fitting Sizes
Mini1/4″ NPT (M)
1 & 2 Liter3/8″ NPT (M)
Gallon & Up1/2″ NPT (M)
10 & 20 Liter3/4″ & 1″ NPT (M)

A550HC Catalyst Addition Device Open
A550HC Catalyst Addition Device

Internal Catalyst Addition Devices

Parr has developed a unique device for adding small amounts of solids (or liquids) from a sealed container held within a reactor. It is of particular interest to users performing kinetic studies of catalytic reactions. This device consists of a small cylindrical chamber with a cap that is sealed to the body with an O-ring. It attaches to the underside of the vessel head with a 1/8″ NPT connection. To discharge the contents of the holder, gas pressure is applied through a valve installed on the top of the head. When the applied pressure is greater than the pressure within the reactor, the cap is forced open and the catalyst or other contents of the holder will be released into the reactor. This device works best in the taller, 450 mL and 600 mL Mini Reactors, and in the 1 liter and larger Parr Reactors.

Internal Catalyst Addition Devices
Complete ReactorMounting Size, ccAssembly No.Thread
Mini6A550HC31/8″ NPT
One Liter8A550HC1/8″ NPT
Larger20A550HC21/8″ NPT

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