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Titre: Gate valve Auteur:Knoblauch; Karl; Heimbach; Heinrich Date:
16 October 1984
Sujet:Mechanical Engineering ; Lighting ; Heating ; Weapons ; Blasting ; Engineering Elements And Units ; General Measures FOR Producing And Maintaining Effectivefunctioning Of Machines OR Installations ; Thermal Insulation In General ; Valves ; Taps ; Cocks ; Actuating-Floats ; Devices FOR Venting OR Aerating ; Medicine ; Sciences ; Chemistry Description:
A gate valve for selectively blocking and unblocking a flow path has a valve body filled with hydraulic liquid and provided with a pair of shutters displaceable by fluid pressure against respective seating surfaces of a valve housing. The valve body is shiftable between a blocking position, in which the shutters are aligned with their seating surfaces, and an unblocking position by means of a plunger projecting into the hollow body in a fluidtight manner but with freedom of relative displacement in the shifting direction. In a valve-closing stroke, the plunger pushes that body into its blocking position solely via the confined liquid; when the body is arrested in that position by a stop, the continuing plunger stroke displaces the liquid to press the shutters onto their seats against a biasing force such as that of elastic membranes holding them onto the body. In a valve-opening stroke, the receding plunger hydraulically withdraws the shutters from their seats and then retracts the valve body into its unblocking position.
Titre: PROCESS FOR RECOVERING NITROGEN FROM GASEOUS MIXTURES CONTAINING OXYGEN AND NITROGEN BY ALTERNATING PRESSURE ADSORPTION ON CARBON MOLECULAR SIEVES Auteur:Schroeter, Hans, Juergen; Heimbach, Heinrich; Tarnow, Ferdinand Date:
22 March 1990
Sujet:Chemistry ; Metallurgy ; Inorganic Chemistry ; NON-Metallic Elements ; Compounds Thereof ; Performing Operations ; Transporting ; Physical OR Chemical Processes OR Apparatus In General ; Separation ; Medicine ; Sciences ; Chemistry ; Chemistry Description:
A process for recovering nitrogen from gaseous mixtures containing oxygen and nitrogen by means of alternating pressure adsorption on carbon molecular sieves comprises an adsorption cycle and a desorption cycle. The desorption cycle, which may if necessary include the pressure-equalization step, includes a resting period amounting to 20 to 80 % of the total time of the adsorption cycle as well as a correspondingly shortened desorption step. The adsorbent pressure-relief line is fully open at the beginning of the desorption step and is fully closed and remains tightly closed after the pressure is reduced to atmospheric pressure during the next resting period. Le procédé décrit comporte un cycle d'adsorption et un cycle de désorption. Ce dernier, qui peut le cas échéant inclure l'étape d'égalisation de pression, comprend un temps de repos de l'ordre de 20 à 80 % de la durée totale du cycle d'adsorption, ainsi qu'une étape de désorption raccourcie en conséquence. La canalisation de détente de l'adsorbant est complètement ouverte au début de l'étape de désorption, puis est complètement fermée et demeure fermée hermétiquement une fois la pression réduite à la pression atmosphérique pendant le temps de repos suivant.