Metering valve

Eig. 6. Schematic ofTeclmicon CHEAl I analy2er where P = aspiration AIV = metering valves CT = capillary Teflon tube M = reagent mixing zone ... 

Stainless-steel bowls Vacuum pump Vacuum tubing Ball valve Metering valve... 

The vapor pressure and density of propellants are employed to assist in formulation. The vapor pressure dictates the force of emission of the droplets from the metering valve of the inhaler. The force of emission is... 

Figure 4A shows the assembled components of a pMDI in operation. The therapeutic usefulness of this device stems from the accurate metering of small doses of drug, which is achieved by a small but complex metering valve. The components of a metering valve are shown in Fig. 4B. 

Fig. 4 (A) Propellant-driven metered dose inhaler. (B) Metering valve.

Microscope 2, cryostat 3, video camera 4, temperate control 5, keyboard 6, menu display 7, printer connection 8, video recorder 9, video monitor 10, Dewar flask with LN2 11, metering valve 12, pressure reducer 13, N2 cylinder (Fig 1 from [1.28]). 

In order to reduce the cooling level to the barrel zone, a metering valve was placed in the water line upstream of the solenoid valve as shown in Fig. 12.8(b). Now when the controller opens the solenoid valve, a much lower quantity of water and thus cooling is available to the barrel zone. Prior to this modification, the barrel temperatures oscillated 10 °C about the set point temperature. After the modification, the temperature oscillations were reduced to about 3 °C, and the profitability of the process was improved due to the minimization of resin consumption. 

Pressurized metered dose inhalers are still the most frequently used systems and they have proven their value in therapy. However, their application in early phases of biopharmaceuti-cal research and further development of dosage forms seems less convenient, since they require special components including propellants, special containers, metering valves, and controlled filling conditions (pressure-filling or cold-filling). 

The metered dose inhalers consist of four basic functional elements, container, metering valve, actuator and mouthpiece. 

The simplest way to adapt a classical mass spectrometer to pressures exceeding 1 10 mbar is by way of a metering valve. The inherent disadvantage is, however, that since the flow properties are not unequivocally defined, a deviation from the original gas composition might result. 

Remedy if the pump has been contaminated by vapors it may help to use a metering valve fo pass air through the apparatus for some period of time here the pressure should not exceed 10 mbar w/hen DIFFELEN is being used. 

The suspension obtained is dispensed into aluminum containers sealed with metering valves by means of the pressure-filling technique. 

Fill the formulation in a pressure-resistant container fitted with a metering valve. 

Dissolve 20 g triamcinolone acetonide in 1.5 kg ethanol. The solution is dispensed into open aluminum containers, and these are sealed with suitable metering valves. The containers are filled by means of the pressure-filling tech-... 

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