Abstract: A pressure valve, especially for rotary piston compressors, which includes a valve housing in the form of a cylindrical sleeve which latter has circumferential through-flow openings or slots which from the inside of the sleeve are covered by a valve closure member comprising resilient lamellae. The valve closure member comprises a pre-bent pre-loaded lattice or grate-shaped metal sheet with parallel longitudinal strips forming the resilient lamellae the ends of which are respectively interconnected by two rim strips. These rim strips rest against both sides of an abutment or counter bearing located opposite the through-flow openings. In the closing position of the valve, the valve closure member tightly engages that inner surface of the sleeve which surrounds the through-flow opening or openings in the sleeve, whereas in the open position of the valve the valve closure member rests against two nearly diametrically oppositely located areas of the inner wall of the sleeve.

Abstract: A method of improving the energy consumption of absorption cooling plants, according to which the solution residue from the evaporator of an absorption cooling plant is employed for the rectification of the vapor of the cooling medium.

Abstract: Heat exchanger for heat-transfer between substances of high pressure difference including a shell, a region through which a cooler substance is conveyed; an inlet for the cooler substance; a bundle of tubes arranged in a cooler substance compartment; and riser conduits operatively connectible to the shell and communicating with the compartment, with the substance to be cooled being passed through the tubes having a high temperature at the inlet of the heat exchanger and at the outlet; a tube bottom of predetermined thickness arranged at the heat exchanger inlet; and a device including a support-grating arranged in the vicinity of the tube bottom, operatively connectible to the shell and extending at least nearly perpendicular to the tube bottom in the region through which the cooler substance is conveyed.

Abstract: A rotary piston compressor of trochoidal type construction with a 1:2 step-up transmission gearing and operating in slip contact. The compressor has a side inlet with an inlet port control edge located in leading direction of piston rotation. A piston edge portion moves ahead and coincides with the inlet port control edge before the piston is located in its dead center position. A peripheral outlet port is provided having a control edge. A follower piston lobe at the same time traverses the peripheral outlet port to uncover it. The control edge of the inlet port which trails in the direction of rotation coincides with a trailing piston edge portion when the follower piston lobe is behind the outlet port in the direction of rotation.

Abstract: A pipe assembly-heat exchanger-steam drum unit, which comprises a pipe assembly heat exchanger for a heat exchange between media of relatively high pressure differentials and a steam drum with a liquid chamber and a steam chamber while the medium passing through the pipes of the pipe assembly-heat exchanger has a high entering temperature, and a pipe bottom located on the inflow side of the hot medium is thin. In the pipe assembly heat exchanger there is furthermore provided a device for relieving the thin pipe bottom. In the pipe assembly-heat exchanger there is also provided a device which is so designed that the cold medium entering the pipe assembly-heat exchanger is conveyed to the thin pipe bottom. The pipes of the pipe assembly-heat exchanger are as an assembly of pipes transversely and centrally passed through the steam drum while the pipe assembly-heat exchanger and the steam drum form a unit with each other.

Abstract: The specification describes a rotary piston compressor with a double-arcuate trochoidal casing track, with which a triangular piston, rotating on an eccentric shaft, makes constant sliding contact at its corners. Transfer flow pockets are provided via which the following working chamber already shuts off, and in the vicinity of the dead center position, is connected for a short time with the compression chamber coming in front of it. The transfer flow recesses are provided in at least one side part of the compressor, extend under its housing casing and extend so far inwards radially in its side wall that they are not swept by the sealing strip. Their timing edge, lying to the fore in the direction of rotation of the piston, is determined by the position of the preceding piston corner of the chamber located in the dead center position.

Abstract: A delivery valve, especially for a rotary piston compressor, which valve is adapted to be inserted into an opening provided in the compressor housing and extending substantially parallel to the axis of the compressor housing. The compressor housing has a bore in which is fitted a sleeve which has tangentially directed valve slots and forms a valve seat. The sleeve surrounds a member which over its entire length has an approximately horseshoe shape. That portion of the horseshoe shaped part which is located opposite the open side thereof faces toward the valve slots and has a greater bending radius than the sleeve. The free ends of the horseshoe shaped part which define the open side of the horseshoe shaped part are bent back toward the outside of this part while the lateral flanks of the horseshoe part bear against the sleeve.

Abstract: A rotary piston compressor with inlet and outlet passages the confinements of which for the inlet and outlet of the medium to be conveyed to the working chambers have controlling functions in cooperation with sealing elements. When the piston is within the region from the dead point of the piston to a point as far as to a location of the piston being turned further by a few degrees measured relative to turning of the eccentric shaft the leading seal element in the direction of piston rotation is located immediately preceeding the start of the inlet passage which communicates with a space of relatively low pressure.