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Gasification - Double Flap Valves 
 

Whilst many of the process requirements for valves are the same for Pyrolysis and Gasification the presence of controlled quantities of air and the higher temperatures experienced in Gasification can necessitate variations in valve design. By working closely with developers of Gasification processes European Gate Valves have gained valuable experience in solving the problems associated with these plants. 
 
The need for high specification valves is predominantly in the areas of reactor feed and discharge. The discharge of char and the products of gasification frequently have the double flap valves directly in the stream of high temperature material. This material is often also abrasive and has a wide range of particle sizes. The temperatures preclude the use of polymer seals and European Gate Valves ground mating seal faces provide just the sealing efficiency required. 
 
Where the feed to the process is unaffected by the high temperatures in the reactor slide valves, either with or without polymer edge seals, have been used. Double flap valves can be required to cycle up to 3 million cycles per year reliably and without interruption and are preferred for these high cycle rates. Double slide gate valves have the advantage of reduced height but are not comfortable with such high frequencies of operation. 
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BROCHURE 
Double Flap Valve
 
Double flap valves are robustly manufactured to suit a wide range of application requirements: 
 
Valve Bodies can be made in: Cast Iron, Cast High Nickel Chrome and Cast Aluminium 
Fabricated bodies made in Carbon steel or Stainless Steels 
High chrome alloy seats and flaps provide long life even in the most aggressive applications 
 
Range of Applications: 
 
Temperatures to 1000°C 
Differential pressures to 102 Kpa where positive is below 
Abrasiveness - Some of the most abrasive materials are comfortably handled 
Lump Size - Depends on the valve opening size 
Opening to 600mm square 
 
Range of actuators: 
 
Linear Pneumatic Cylinders 
Rotary Pneumatic Cylinders 
Electric Motor with cams or push rods 
Gravity or Manual 
Hydraulic 
Features: 
 
Dual access covers 
Outboard Bearings 
Adjustable packed shaft seals as standard 
VDMA ISO standard cylinders 
Removable seat and flap with the valve in situ 
All metric standard components 
 
Wide range of optional equipment: 
 
PLC Control 
Flap position indication 
Heat shields 
Cooling for high temperature applications 
Purged high efficiency shaft seals 
Double Flap Valve
Double Flap Valve
Double Flap Valve
Double Flap Valve
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