Flow/ Pressure Controllers Overview en Houston, Texas, USA
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Descripción
This section includes Valco stainless steel needle valves, combination
on/off needle valves, high pressure prime/purge and on/off valves,
pressure regulators, and flow controllers.
On/off and prime/purge valves
High pressure
on/off and prime/purge valves
feature
quality engineering, precision machining, and extremely low internal volume
(< 2 µl). In prime/purge models, mobile phase flows aroud the
needle when the valve is closed, relieving the back pressure from the column.
When the valve opens, mobile phase vents to waste to prime the pump.
2,000 – 10,000 psi valves
40,000 psi valves
Gas flow controllers
Flow controllers provide a stable flow rate under varying pressure. An
upstream-referenced controller maintains the flow rate as long as the upstream
(inlet) pressure is held constant; a downstream-referenced controller maintains
a constant flow under constant downstream (outlet) pressure.