Glove valves

Technology—Designs that have a detrimental affect on performance include a piece of equipment meant to be used outdoors designed with data entry keys that are too small and close together to be operated by a gloved hand, or a shutdown valve positioned out of easy reach. 

The CPA or "Snake Pen" consists of a pen body containing a porous wick, such as that used in felt pens, and a solution ofDMSO and any number of toxins. When the wick is touched to the victim s skin he receives a fatal dose of poison. The CPA is built from a correction fluid pen, available at any office supply store. These pens have a soft, flexible body and are easy to modify. Unscrew the top from the son pen body, squeeze out the correction fluid and flush the interior with solvent to remove all traces of its original contents. Note that most of these pens have a left-hand thread on the body. The tip of the pen is sawed off and the valve stem carefully removed. Ream out the pen tip to fit the wick. A felt tip marker pen works well as a wick, after being soaked and rinsed in sol vent to remove traces of ink. It may be necessary to trim the wick to fit. Press the wick into the pen tip until about 3/8 " protrudes and seal around it with silicone sealer. When the sealant is dry, put on rubber gloves and, using a hypodermic syringes, inject the DMSO solution into the pen barrel until it is about 3/ 4 full. Be sure not to squeeze the pen while accomplishing this. Coat the barrel threads with a little silicone sealer, screw on the cap and allow the pen to dry in a vertical position. Line the inside of the cap... 

Sampling is usually done by two persons, each equipped with a full-face mask and heavy rubber gloves. Connect to the unloading valve in the dome of the tank a stainless-steel sampling line with a 1-inch union and a 4-inch valve, and attach to the sampling line by a... 

In a glove box several grams of benzophenone and freshly cut sodium metal were added to a glass tube (40 cm long, 2 cm ID) topped with a Kontes valve and vacuum line adapter. This glass tube was attached to the vaccum line and evacuated. The tube was immersed in a — 78°C isopropanol/COz slush bath. The lecture bottle valve on the (CH3)20 tank was opened slowly and (CH3)20 was condensed into the glass tube at — 78°C. The pressure of... 

In a typical experiment, 4.63 g. (0.025 mole) of niobium(V) fluoride is mixed with 0.348 g. (0.012 mole) of -200-mesh silicon and loaded into the reactor inside a glove box under dry nitrogen. The assembled reactor is connected to a helium tank and repeatedly pressurized and depressurized to rid the system of air. The entire system is pressurized to 50 p.s.i., the Monel reactor valve is closed, and the reaction chamber is placed in a vertical furnace at 350°C. The pressure in the external lines is left at 50 p.s.i. to prevent entry of air. 

FIGURE 9.15 Design of a SI separation system for on-line separation of actinides for ICP-MS detection, where the SI system handles clean solutions and reagents outside the radioactivity containment glove box, while the injection valve and separation column downstream handle radioactive solutions. 

Wear butyl36 rubber gloves, laboratory coat, eye protection, and self-contained breathing apparatus. If the valve is leaking because it cannot be closed (a common occurrence), the gas can be bubbled through a reducer (sodium sulfite) and excess sodium carbonate solution. Be sure to include a trap in the line to prevent the solution from being sucked back into the cylinder. If this cannot be done, the cylinder should be placed in, or adjacent to, a fume hood and left to bleed off. 

Leaking Cylinder. Wear neoprene gloves and self-contained respirator. Transfer the cylinder to a fume hood. Attach a long piece of flexible tubing to the cylinder valve outlet. Adjust the valve to give a moderate flow of diborane. Introduce the gas to the bottom of a tall vessel containing water. Diborane is hydrolyzed by water to hydrogen and boric acid.12... 

If possible, seal the cylinder and return to supplier. Otherwise, wear nitrile rubber gloves, face shield, goggles, breathing equipment, and laboratory coat. Remove leaking cylinder to a safe area outdoors or an efficient fume hood. Fit the cylinder with an appropriate control valve and a length of hose. Discharge the gas slowly into 15% aqueous sodium hydroxide. Cautiously make the sodium hydroxide solution strongly acidic with concentrated hydrochloric acid, and then add sodium sulfite until reaction ceases. After... 

Vacuum chambers attached to the box through which items are introduced into the glove box. The vacuum chamber should be equipped with the appropriate hermetically closed doors, valves and a vacuum pump. The chamber should maintain a vacuum of 10 2—10-3 torr in order to ensure a low level of contamination upon its being opened to the glove box. 

The absorbers column should be attached to the glove box by the appropriate pipes, valves and blowing system. It should include a regeneration capability. 

A trapping system for vapor of organic solvents and C02. These systems are based on massive circulation of the glove box atmosphere through a cooled trap outside the glove box. Such a system should include an appropriate blower, valves and a connection to a vacuum line to enable emptying of the trap. 

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