5 BOTTOM BLOWDOWN
5.1 Overview of Bottom Blowdown
5.1.1 Features and Benefits
Bottom blowdown is used to remove solids which build up at the bottom of 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 benefits of the Autoflame
bottom blowdown system include:
Full stainless steel valve construction with replaceable bronze liner
24V DC Autoflame Unic 5 servomotor 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
Timed blowdown with manual/automatic operation
Bottom blowdown sequence logging
Up to 4 timed blowdowns over a 24 hour period
Repeatable up to 10 times from 1 to 60 seconds for each blowdown
‘Parked’ position to reduce valve opening time
Quick servomotor disconnect facility for manual actuation
Rotary operation ensures water tight shutoff
Sealing design concept ensures no leaks
Valve Specifications
Power Supply: 24V DC
Flange Connection: 400lb/ PN40
Valve Sizes: 1”, 1 ½”, and 2”
Figure 5.1.1.i Bottom Blowdown Valve and Industrial Unic 5 Servomotor
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