Deskripsi
Description Blowdown Valve PA46(DN40 PN40) Gestra
The following rapid-action intermittent blowdown valves are
installed in pipes to discharge boiler blowdown water:
n Rapid-action intermittent blowdown valve PA 46, PA 47
or PA 48 (manually operated)
n Rapid-action intermittent blowdown valve MPA 46,
MPA 47 or MPA 48 (automatically operated)
The equipment is designed for discharging boiler blowdown
water with non-metallic solids from steam boilers.
The equipment may only be used within the admissible
pressure and temperature limits, with due consideration of
chemical and corrosive influences.
Optional extras Blowdown Valve PA46(DN40 PN40) Gestra
n Assembly kit 335130 for retrofitting the actuator of an
existing MPA 26 or MPA 27 in a PA 46 or PA 47 to upgrade
them to an MPA 46 or MPA 47 (guide bushing with washer
and spacer disc)
n Diaphragm actuator 337866 for PA 4x (diaphragm
actuator, spacer disc)
n TA program controller for MPA 4x
n Retrofit kit 337980 containing proximity switch for
MPA 4x (one limit switch)
n Retrofit kit 337946 containing proximity switch for
MPA 4x (two limit switches)
n Emergency lever 337867 for MPA 46/47 and 338073
for MPA 48
Function Blowdown Valve PA46(DN40 PN40) Gestra
When the intermittent blowdown valve opens, the large
cross-sectional area of the orifice creates a suction effect,
giving a short-term high water flow which will discharge the
precipitated sludge and sediments.
Type PA valves are intended for manual operation. For the
blowdown process, the valve is opened fully by hand with the
lever for around two to three seconds. The spring-loaded valve
cone is forced out of the valve seat. As a result, accumulated
sludge and sediments rush out of the open valve.
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