GESTRA BA 46, Original Installation Instructions

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use in potentially explosive atmospheres, the
discharge or prevention of possible electrostatic
charging is the responsibility of the manufacturer or
owner of the system. If there is a possibility that
medium might escape, e.g. via actuating devices
or leaks in screwed couplings, the manufacturer or
owner of the system must take this into
consideration when dividing the area into zones.
Special actuators with ATEX approval are
available on request.
Task and function
Purpose
The equipment is used for the continuous manual
or automatic removal of boiler blowdown from
steam generating units.
Function
Equipment types BA 46 and BA 47 are intended for
manual operation. The required flowrate is
calculated using a formula or can be seen in the
flow diagrams (see page 18). The flowrate is set
manually using the control lever.
In combination with an LRR 1-... conductivity
controller, LRG 1...-... conductivity electrode or
LRGT 1...-... conductivity transmitter, the
equipment provides an automatic conductivity
regulation system (continuous blowdown control).
Control lever positions:

Position "0" (CLOSED): No removal of boiler
blowdown

Operating position: The set quantity of
blowdown is continuously removed

Position "1": Boiler blowdown is removed at
8 % of the maximum flowrate

Position "2": Boiler blowdown is removed at
33 % of the maximum flowrate

Position "3": Boiler blowdown is removed at
66 % of the maximum flowrate

Position "4" (OPEN): Boiler blowdown is
removed at the maximum flowrate.
The operating position can be infinitely adjusted
using the control lever or actuator. The set valve
position is displayed by the dial on the control lever
scale.
In equipment models with actuator (BAE), the
"OPEN" and "CLOSED" positions are indicated by
the (13) control pin.
The nozzle needle (25) is raised depending on the
set valve position. Fluid flows through the seat
bushing (21), the stepped bushings (20) and the
anti-wear bushing (19).