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PNEUMATIC SELF-DISCHARGING CEMENT CARRIERS

• General description for self discharging cement carriers
• DBMAS® (Dry Bulk Management System)
• Hurricane Aeration System
• Pinch Valves (Discharge Valves)
• Automated Loading filter

 

Pinch Valves (Discharge Valves)

Valves are needed in the process lines and the commonly used valves are butterfly valves.  The disadvantage of this type of valve is that they operate in the material flow.  The material/air mixture hits the valve flap in the ‘open’ position.  However, during opening and closing of the valve the material/air mixture tries to slip through the small opening space between flap and body.  It is at these moments the wear on the valves is at the highest level.

By installing quick acting actuators the opening and closing times are reduced to a minimum in order to reduce the wear.  However, if a small piece of rope or other foreign object sticks between flap and body, closing is not possible.  The material/air mixture squeezes itself through the little opening and ‘sand blasts’ a hole in the valve.

Pinch valves
After extended tests on various types of other valves, we have selected a special type of pinch valve to overcome the disadvantages of butterfly valves.  The pinch valve consists of a special rubber hose, which is clenched together in a closed position.  In open position, the valve has the same diameter as the pipeline and does not obstruct the material/air flow in any way (no wear).

Pinch valve in open position	Pinch valve in closed position

Quick acting actuators clench the hose together.  At the position where the hose is clenched, the rubber is made much thicker.  This ensures an extended lifetime. If a piece of rope or foreign object is captured during closing time, the rubber will mould around this, and still fully closes 100%. The chance that a foreign object is captured in the valve is almost zero while no parts operate in the material airflow.  On the chance a foreign object is captured the valve automatically closes off.

This is the prime reason that the lifetime of the valve can be guaranteed for 100.000 tons of material handled.

In several cement handling ship un-loaders however, the pinch valves have proven that more than 300.000 tons of cement can be handled before the valve is worn out.

When the valve has finally worn out, it is only the rubber inner sleeve that would need to be replaced.  Not the complete valve like in the case of the butterfly valves.  The inner sleeve can easily be exchanged and reduces maintenance and shutdown time.

Hurricane Aeration System

Automated Loading filter

 

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