The hazardous area approved range of valves increases with the addition of the size 33 proportional flow control Cartridge valve
Wandfluh Offers a comprehensive range of valves both cartridge and flange mounted fitted with the popular MKY solenoid. The solenoid has many approvals including ATEX and IECEx.
Please see data sheet 2.6-655 for further information, link below.
http://www.wandfluh.com/products/detail/qnbpm33/