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INSTALLATION, OPERATION AND MAINTENANCE MANUAL
MODEL SWG, SERIES C, B, V, N
International Valve Marketing, LLC
Page | 11
Last Revision Date: 09/13/2013
SECT: 1.11
OPERATION
Pr
e
-Op
er
ati
o
n
Series – C
Series – B
Series – V
Series - N
Valve Pre-Operation
· Floats are at rest
· Pump is off
· Floats are at rest
· Pump is off
· Floats are at rest
· Pump is off
· Floats are at rest
· Pump is off
Initial Start-up (First Time Use)
1.
Install valves.
2.
Verify Isolation valve installed and closed.
3.
Verify Port Valves are closed.
4.
Verify fasteners are properly installed.
Pump Start -Up
· Air Enters Valve body
· Floats are at rest
· Air escapes between annulus of
valve chamber and floats
· Air Enters Valve body
· Floats are at rest
· Surge float is Biased closed and
seated against top flange
· Air escapes between annulus of
valve chamber and floats
Initial Start-up (First Time Use)
1.
Visit each valve location sequentially.
2.
Open Isolation valve.
3.
Verify leak-free assembly.
N
O
R
M
A
L O
PE
R
A
TION
High Flow Reaches Valve - Activates Surge Float
· High air flow lifts surge float and
seats it against the top flange
· Air escapes through multiple
orifices in surge float
· Partial closure creates
backpressure, slows
approaching fluid
· Dynamic closure avoided,
controls water hammer
· Air escapes through multiple
orifices in surge float
· Partial closure creates
backpressure, slows
approaching fluid
· Dynamic closure avoided,
controls water hammer
· High air flow lifts surge float
and seats it against the top
flange
· Air escapes through multiple
orifices in surge float
· Partial closure creates
backpressure, slows
approaching fluid
· Dynamic closure avoided,
controls water hammer
Fluid Arrival Closes Valve
· Buoyancy lifts control float
· Seats control and nozzle floats
against anti-surge float
· Valve body is now pressurized
· Buoyancy lifts control float
· Seats control and nozzle floats
against anti-surge float
· Valve body is now pressurized
· Buoyancy lifts control float
· Seats control and nozzle floats
against anti-surge float
· Valve body is now pressurized
Trapped Gases Activate Nozzle Float
· Entrapped gases accumulate in
valve chamber
· Control float loses buoyancy
and drops from nozzle float
· Accumulated air escapes
through nozzle and surge floats
· Entrapped gases accumulate in
valve chamber
· Control float loses buoyancy
and drops from nozzle float
· Accumulated air escapes
through nozzle and surge floats
· Entrapped gases accumulate in
valve chamber
· Control float loses buoyancy
and drops from nozzle float
· Accumulated air escapes
through nozzle and surge floats
Air Evacuation Closes Valve
· Fluid replaces escaped air and
buoyancy lifts control float
· Control float seats nozzle float
against surge float
· As more gas accumulates,
control float loses buoyancy and
steps 4 through 6 repeat
· Fluid replaces escaped air and
buoyancy lifts control float
· Control float seats nozzle float
against surge float
· As more gas accumulates,
control float loses buoyancy
and steps 4 through 6 repeat
· Fluid replaces escaped air and
buoyancy lifts control float
· Control float seats nozzle float
against surge float
· As more gas accumulates,
control float loses buoyancy and
steps 4 through 6 repeat
Po
st
-O
p
e
rati
o
n
Pump Shut Down or Column Separation
· Fluid evacuates from valve and
floats drop
· Air enters inlet/outlet yielding
vacuum protection
· Fluid evacuates from valve and
floats drop
· Air enters inlet/outlet yielding
vacuum protection
· Fluid evacuates from valve and
floats drop
· Air enters inlet/outlet yielding
vacuum protection
· Fluid evacuates from valve
and floats drop
· Air enters inlet/outlet
yielding vacuum protection
EMERGENCY OPERATION PROCEDURE: LEAKING VALVE
1.
Close Isolation Valve
2.
Bleed Pressure from Valve
3.
Service Valve
