Abstract: The disclosure relates to a membrane pump head for a homogenizer or a high-pressure pump. The membrane pump head comprises at least one pump head enclosed in a pump housing. The membrane pump head also includes a product chamber with inlet and outlet for the product, as well as a hydraulic chamber in which a piston is disposed to operate. The product chamber and the hydraulic chamber are separated by a double membrane. The membrane is oriented at 15-75° in relation to the longitudinal direction of the piston.

Abstract: The invention relates to an arrangement in a pump block. The pump block includes a plurality of pump valves each connected to a piston in a piston pump. The pump block also includes an inlet pipe which is common to all of the pump valves. The inlet pipe has a connection to each pump valve. One connection between the inlet pipe and the pump block is fixed and includes a flange fixedly screwed in the pump block, the remaining connections are movable in the longitudinal direction of the inlet pipe. The movable connections each include a flange with over-dimensioned boltholes in which a spacer is placed.

Abstract: A device and a method for achieving sound reduction within a frequency band in a transport system for gaseous medium, the transport system being arranged between an inlet, which is connected to a sound source, and an outlet. The transport system comprises with a plurality of interconnected channel parts (1-7) and exhibits at least one module (8, 9) comprising at least one reflection attenuator (4) with a resistive length (a2, b2) and at least one reactive attenuator (3) with a reactive length (a1, a3, b1, b3). The resistive length is brought to constitute a quarter of a wavelength of the center frequency of the frequency band and the reactive length is brought to constitute a quarter of a wavelength of a frequency between, respectively, the lower and upper limit frequencies of the frequency band.