12 Bottom Blowdown
Mk8 MM Manual Page | 221
12 BOTTOM BLOWDOWN
12.1 Overview
The purpose of Bottom blowdown is to remove solids which build up at the bottom of a steam boilers. In the
Autoflame system, there are options to either manage the blowdowns through automatic timings, or to
manually trigger them. The programmable electronic automatic blowdown ensures repeatable blowdown
timings without the need of a compressed air supply. A pulsed bottom blowdown is used to disturb settled
solids at the bottom of the boiler, making the evacuation effect more efficient. The timings and intervals of
the bottom blowdowns are user configurable.
The Bottom Blowdown function on the Mk8 MM can be configured in two ways:
• Bottom blowdown using solenoid.
• Bottom blowdown using Autoflame controller.
The benefits of the Autoflame Bottom Blowdown system include:
• Options for solenoid blowdown of fully modulating blowdown
• Full stainless-steel valve construction
• 24V DC Autoflame industrial type servomotors for control and repeatability
• Electronic proof of open/close end switches
• Lithium-Ion battery technology ensures guaranteed closure on power failure
• Total electronic operation – no compressed air supply required
• Timed blowdown with manual/automatic operation
• Bottom blowdown sequence logging
• Up to 10 timed blowdowns over a 24-hour period are possible
• Repeatable up to 10 times from 1 to 60 seconds for each blowdown cycle
• ‘Parked’ position to reduce valve opening time
• Quick servomotor disconnect facility for manual actuation
• Rotary operation ensures watertight shutoff
• Sealing design concept ensures no leaks
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