Parts for Pressure/Vacuum Tubes

Description

Our Pressure/Vacuum Tube is the most reliable NMR tube for medium range pressure (<300 psi) and ultra vacuum (10-8 torr) experiments on the market. It is designed to connect to a 1/8″ metal (SST or brass) vacuum line using Swagelok® fittings or a rubber vacuum hose using a glass connector (OF-60). The PV-ANV valve is made of PTFE and all other parts are Pyrex® or equivalent. Valve is opened by turning counterclockwise. Due to the nature of glass, Extreme Caution should be exercised when using at elevated or reduced pressures as performance of tubes under pressure or vacuum cannot be guaranteed. Adequate safety shielding should always be used when working in these conditions.. Wilmad Pressure Vacuum Sample Tube Instruction The upper portion of the Needle Valve is threaded and I.D. beveled to accept Swagelok® 1/8” tubing nut and ferrule, which makes it simple to connect the “PV” tubes to a compressed gas cylinder or directly to a vacuum rack as shown on the right picture. The following picture depicts the components of a Swagelok 1/8” connector:  X=A, B, or C in the part number If a fresh installation of the Swagelok connector on the gas line is required, please follow the following steps to assembly the PV tube: 1.  Determine the material of the gas line. For stainless steel gas line, order 250-4B-2, for brass gas line,  order 250-4A-2, for plastic gas line, order 250-1C-2, 250-2C-2, 250-3C-2. 2.  If installing on a metal gas line (brass or stainless steel), please pre-Swagelok fitting on the gas line by following the video below The outer diameter of the gas line is 1/8”, so ¾ extra turn would tighten the fitting. An example of stainless steel fitting 250-4B-2 on a gas line is shown below. 3.    Remove the lower nut (the one with the blue cap); 4.    Install the PTFE PV valve in the nut as shown in picture below. The needle valve can be tightly closed using a small wrench. If connecting the PV tube to an existing glass vacuum manifold through a rubber hose is needed, please refer to the picture below for parts:   After assembly

Application Notes

Each Pressure/Vacuum Tube includes a PV-ANV valve, not the Swagelok® nut or ferrules. Order these separately.