What is the Medium Pressure Injection Valve?
The Medium Pressure Injection Valve is an external sample loop style injector for applications up to 1,000 psi (69 bar). Each port is connected through an internal flow path to the adjacent port. In the “Load” position, the sample loop is
loaded through Port 2, while the system flow runs through Ports 5 and 6. When the valve is switched 60 degrees to the “Inject” position, the sample loop is included into the system, and flow goes from Port 5, through the loop and out Port
- Maximum Operating Pressure: 1,000 psi (69 bar)
- Maximum Operating Temperature: 80˚C (176˚F)
- Thru-hole diameter: .040" (V-450); .063" (V-540)
- Port-to-port volume: 5.1μL (V-450); 12.7μL (V-540)
- Wetted materials: Teflon® and Vespel®
Included with the Valve
- (6) P-235, PEEK® 1/4-28 nuts
- (6) P-200, ETFE ferrules
- (6) P-335, PEEK 1/4-28 nuts
- (6) P-300, ETFE ferrules
Making an Injection
- Complete loop fill
When the sample loop is completely filled, the injection volume is equal to the volume of the loop and the valve passages. This is the most precise method to inject a sample using these valves. It is recommended
to overfill the loop with at least twice the volume of the loop. The excess sample will go to waste out Port 3, and this will insure the loop is completely full. To completely fill the loop, inject the sample through Port 2 while the valve is
in the “LOAD” position. Load the sample and when finished, turn to “INJECT” to include the sample loop in the system flow path.
- Partial loop filling
It is not recommended to partially fill a sample loop with more than half of its volume. Due to the laminar flow effect, larger volumes may be lost out of the waste line (Port 3). The laminar flow effect
in tubing is depicted below. The average velocity of the sample at the center of the loop can be up to twice the velocity at the walls of the tubing.
M Some solvents in this category are satisfactory, others are not. Please review the notes above or contact IDEX Health & Science for further information.
NR Not recommended