11
As the float
(16)
continues to rise, the mechanism link
(17)
is engaged which increases tension in
the springs
(19)
. When the float
(16)
has risen to its upper tripping position, the linkage
mechanism
(17)
snaps upward over center. The energy in the springs
(19)
is released as the push
rod
(18)
is moved upward, to simultaneously open the motive steam inlet valve
(5)
and close the
exhaust valve
(9A)
. Steam flow through the inlet valve
(5)
increases the pressure within the body
and closes the inlet check valve. When the pressure in the body shell
(15)
exceeds the
backpressure in the condensate discharge line, it opens the outlet check valve
(21)
and forces out
the condensate in the discharge line.
As the condensate level in the pump body
(15)
falls, the float
(16)
is lowered and mechanism link
(17)
is engaged, which again increases the tension in the springs
(19)
. When the float
(16)
reaches the lower tripping position, the linkage mechanism
(17)
snaps downward over center.
The energy in the springs
(19)
is released as the push rod
(18)
is moved downward, to
simultaneously open the exhaust valve (9A) and close the steam inlet valve
(5)
. Steam / air utilized
for pumping the condensate gets released through the exhaust valve and this completes one
pumping stroke.
When the pressure in the pump body
(15)
has fallen to the same level as the pressure in the inlet
pipe, the inlet check valve opens. Condensate will again flow through the check valve to fill the
body and begin next cycle.
PPPPU