Cylinder valves pressure seal

Butane cylinders, which are so widely used for domestic service, are now provided with a self-sealing clip-on valve. The pressure regulator, which is normally attached directly onto the cylinder outlet, is fitted by a simple push-on or snap-on action and is provided with a lever, which will open or shut the cylinder valve. 

The long cylinder of a bicycle pump has a volume of 1131 cm and is filled with air at a pressure of 1.02 atm. The outlet valve is sealed shut and the pump handle is pushed down until the volume of the air is 517 cm. Compute the pressure inside the pump. Express its value in atmospheres and pounds per square inch. 

A 75-ml Parr high-pressure reactor (Parr Instmment, Moline, IL, USA) was used for liquefaction of the feedstock. The reactor consists of a reaction cylinder and a pressure gauge or valve assembly. An induction heating system, which allows the reduction of heatup times by about two orders of magnitude, was customized by L. C. Miller, Monterey Park, CA, USA. For a typical mn, 5 grams of feedstock and 45 ml distilled water were placed inside the cylinder. The cylinder was then sealed and purged through two valves on... 

The balanced pressure sampling system. Figure 3.13, comprises a movable needle with two vents and a solenoid valve Vi in the carrier gas line. The heated needle, which has a hollow part permitting flow in either direction, moves in a heated cylinder and is sealed by three O-rings. In the standby position the lower needle vent is placed... 

Pressure seal valves get their name from the fact that the higher the cylinder pressure the greater the... 

These different outlet connections were assigned to minimize the possibility of connecting a gas to a system not suitable for use with that gas. These connections are designed to provide a gas-tight seal when cormected and tightened properly and used at pressures not exceeding those specified for their use. Specifications and gas assignments for CGA cormections can be found in CGA Pamphlet V-1 Compressed Gas Cylinder Valve Outlet and Inlet Connections. ... 

This type of sprayer consists of a sealed container of compressed gas and pesticides. The pesticide is driven through an aerosol-producing nozzle when the valve is activated. Pressurized cans usually have a capacity of less than one quart (one liter) and are not reusable. Larger reusable cylinders are available for structural pest control and for some greenhouse uses. Figure 8.1 depicts an aerosol can containing an insecticide under pressure... 

A rotary-piston pump is an oil-sealed, positive-displacement vacuum pump. The oil both lubricates the pump and seals the discharge from the suction side of the pump. As the piston rotates, gas enters a chamber, as shown in Figure 5.2. Then, the inlet port closes, and the gas is compressed in the chamber until the discharge valve opens, exhausting the gas to the atmosphere. Possible contamination of the oil with condensable vapors, usually water, is a problem. One way condensation can be avoided is by reducing the partial pressure of the condensable gases by allowing air to leak into the cylinder, which is called a gas ballast. 

The synthesis equipment consists of a stainless steel cylinder with an inside diameter of 100 mm and a height of 265 mm and is shown schematically in Fig. 1. The wall of the cylinder is 3 mm and the top plate 10 mm in thickness. The cylinder is mounted with 12 MX10 stainless steel screws on a base plate made of stainless steel. The base plate is furnished with a rabbet which contains the O-ring Teflon seal between the cylinder flange and base. In addition, three 6-mm o.d. stainless steel lines are welded to the base. One line leads to a vacuum pump, another line to the gas bottle, and the third to a mechanical safety valve which opens for pressure higher than 75 atm. The inlet line has connections to a... 

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