Knife Gate Valves
Double Dump Valves
Carolina Conveying

Carolina Material Technologies provides a full range of heavy-duty pneumatic conveying valves including rotary airlock valves, diverter valves, weigh valves, slide gate valves, iris valves and maintenance gates. In addition CMT provides butterfly valves, knife gates and orifice gates.

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Rotary Valves
Gate Valves
Diverter Valves
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Butterfly Valves
Butterfly Valves
Rotary Airlock Valves

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Pneumatic Conveying Gates and Valves

Airlocks have three main functions:
- Feeder applications with no pressure used purely to feed product from a bin or hopper
- Filter applications e.g. cyclones, baghouses and various collectors where fine dust must be collected whilst maintaining an air seal.
- Pneumatic conveying applications where feeding material into a system against pressure or vacuum.

Conveying Diverter Valves are used in the pneumatic conveying industry to reroute powder, pellets or granules from one discharge to another.

Double Dumps are used for low-pressure feeding applications on fibrous, large particle and/or very abrasive products where rotary airlocks would typically jam and/or suffer intolerable wear.  The maximum pressure differential is normally 20” Wg, while the maximum temperature is in excess of 1,000� F.  These units are ideal on the bottom of dust collectors or gravity feed hoppers. These double dump valves by  Carolina Conveying consist of two flaps connected by counterweights or spring loaded spindles, which are operated by a motor driven cam.  The cam alternately opens and closes each flap, allowing material to pass through the separate chambers in batch form and insuring a gas seal. 

 Pneumatic Knife Gate Valves are heavy duty valves with cast bodies, knife gate, stuffing box with packing and oversized air cylinders.  These heavy duty units have an ASA 150 lb bolt hole pattern.  Options include resilient seat for sealing against pressure or vacuum; solenoid valves and proximity sensors.  The knife gate is also available with hand crank actuator.

A butterfly valve consists of a circular disc with its pivot axis at right angles to the direction material is flowing. The valve is made up of a body, seat, disc, stem, and actuator. Each component part is available in a variety of materials called “trim features.” Properly combining trim features to address material handled and environment is important in selecting the correct model valve for its intended service.

Diverter Valve
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