Stainless-Steel VHP Fittings
The all Stainless-Steel VHP Fittings include a unique ferrule system with two compression points to provide twice the grip of a standard ferrule. This design also allows the bite on the tubing to be less concentrated and does not restrict the inner diameter, as discussed in the Application Note below. The ferrules for 1/16” OD tubing and 10-32 coned ports are two pieces, while the grooved ferrule for 1/32” OD tubing and M4 coned ports is a one-piece design for easier handling, but it will act as two pieces with double compresion on the tubing as it is tightened down.
All-PEEK™ VHP Fitting
In a one-piece design, the VHP-150 is an all-PEEK fitting that can operate up to 10,000 psi on PEEK tubing. Using a similar captive ferrule as the VHP-320 series fittings on the previous page, the patent pending fitting design is also reusable up to 10 cycles, decreasing down time during any hardware changes. Instead of having to replace tubing and fittings if a new column is changed, the re-usable all-PEEK fitting will be able to be adjusted to the new dimension X depth. Created specifically for ion chromatography, the VHP-150 will add connection confidence at ultra high pressures.
In order to seal up to the stated pressure rating, the VHP-200-01 ferrule requires 20 in-lbs (2.25 N·m) of torque. Similar ferrules on the market require tightening torque of at least 30 in-lbs (3.3 N·m), which can result in a restricted tubing passage, as shown in the picture below. This restriction can increase turbulence and add a ‘throttling’ effect to the fluid pathway, resulting in mixing and other potential chromatographic problems.
|VHP-200||VHP Stainless Steel Fittings 10-32 Coned, for 1/16" OD Single|
|VHP-205||VHP Stainless Steel Fitting 10-32 Coned, for 1/16" OD, Long Single|
|VHP-700X||VHP Fitting 6-40 Coned, for 1/32" OD 10 Pack|