SkoFlo Industries SF15000NMFB, Инструкция по эксплуатации и обслуживанию, Страница: 4 / 14

ADJUSTMENT AND CALIBRATION:
SF
3-WAY
VALVE
CHEMICAL INJECTION
CONTROL VALVE
CHEMICAL TO PROCESS
(AS AN EXAMPLE SAY
4200 PSIG / 289 BAR)
CHEMICAL TO CALIBRATION
BEAKER OR TO CALIBRATION
FLOW METER
(AS AN EXAMPLE SAY
50 PSIG / 4 BAR)
CHEMICAL
SUPPLY
(AS AN EXAMPLE
SAY 4500 PSIG / 310
BAR) - MUST BE AT
LEAST 200 PSI / 14
BAR HIGHER THAN
PRESSURE OF THE
CHEMICAL TO
PROCESS
The SkoFlo Valve is a pressure independent flow control valve. Once the valve is set at a desired
flow rate, that flow rate is maintained even though the pressure conditions upstream and/or
downstream of the valve may change considerably.
The standard Multi-Point SkoFlo valve is set by manually adjusting the rate adjustment handle.
When the desired flow rate is set, the valve needs no further adjustment, and the valve remains at
that fixed flow rate until the rate adjustment handle is turned to a new setting.
The flow rate can be set using a flow meter in the line to the process. However, a flow meter in this
line must be capable of withstanding the process pressure. This normally limits the availability of
this type flow meter.
The most common method of calibrating the SkoFlo Valve is with a 3-way valve and a line to a
calibration beaker or to a low pressure flow meter. Once the flow rate is set, the 3-way valve is
switched to direct the chemical to the process.
Since the SkoFlo Valve flows at the set rate independent of the pressure differential across the
SkoFlo Valve, the flow rate to the process is the same as the flow rate set using the beaker or flow
meter. Overall monitoring of the flows is done by taking inventory of the usage from the supply
tank.
In the above example, the SkoFlo Valve is set with a differential pressure of 4450 psi / 306 bar
across the valve. The flow rate set will remain the same when the chemical is routed to process and
the SkoFlo Valve has a differential pressure of 300 psi / 21 bar. Note that the SkoFlo valve should
not be operated continuously at differential pressures above 3000 psi / 207 bar.
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