Shippensburg Pump Co. Forum Typical Pressure Powered Unit ..
Typical Pressure Powered Unit in Shippensburg Pump Co.10 Years AgoSource
Condensate return
A
non-electric pump operates on the positive displacement principle. Pressure,
typically supplied by steam, is used to pump high temperature condensate or
other liquids. Generally used where electricity is not readily available or in
hazardous environments that prohibit use of electrical power.
Condensate
first flows into the receiver (top
tank). Condensate then flows, by gravity: ·
out the receiver (top
tank) drain ·
down the interconnected suction piping
·
through the suction
inlet (swing) check valve ·
into the inlet of the pump
body (bottom tank)
Back
pressure keeps the discharge (spring-loaded)
check valve closed preventing condensate from flowing out the
discharge outlet of the pump body.
As the body fills with liquid, the float rises and the water level of the
receiver falls. During the filling phase: ·
the steam inlet is
closed ·
the exhaust vent is
open ·
the suction inlet (swing)
check valve is open ·
the discharge (spring-loaded)
check valve is closed Steam enters
When the
float reaches the high water position (i.e., trip point), the spring of the
float mechanism is released which begins the pumping phase. At the trip point,
the steam inlet is
opened allowing steam to enter into the top portion of the pump body. Simultaneously, the exhaust vent is closed allowing
the internal pressure to increase within the pump body. Condensate discharged
As the
internal pressure increases within the pump body, the suction
inlet (swing) check valve is closed stopping gravity
flow of condensate into the pump
body and causing the water level in the receiver to rise.
Simultaneously,
at the high water trip point, the discharge
(spring-loaded) check valve opens
starting the pumping phase as the pressure within the pump body exceeds the back
pressure on the discharge (spring-loaded)
check valve-- thus pushing the condensate out the discharge pipe. The
water level with in the pump body begins
to fall, along with the float. Steam vented
When the
float reaches the low water trip point, the float mechanism reverses action.
The steam inlet closes
and the exhaust vent opens
venting the internal pressure within the pump body to atmosphere. The venting equalizes the internal
pressure of the pump with external pressure allowing gravity flow of condensate
to resume into the pump body.
The fill/pump cycle repeats. Visit Our Site |