PULSATION TECHNOLOGY 

PMC has experience of creating a system with pulsation and noise very well captured inside the hydraulic power pack. Noise levels of 65 dBA can be achieved at 300 bar pressure. The TPD pulsation damper is an active part of the overall concept but there are also suction line technology and technology for sound traps in the ventilation system of power packs that helps achieve overall silence.

Fluid-borne noise in hydraulic system

All types of hydraulic pumps and motors generate pressure pulsations in the hydraulic fluid. The pressure pulsations are propagated out into the system with very little attenuation in the fluid, resulting in vibrations within pipes. The vibrations are transmitted to building and machine structures via the points of contact on the hydraulic pipes, and audible structure-borne noise is emitted by the pipework and other vibrating surfaces.

The TPD pressure pulsation damper solves the problem

The pressure pulsation damper reduces the pressure pulsations and, as a result, the problem of structure-borne noise. Vibrations in pipework and valve panels often result in leaks, e.g. due to fatigue in connection fittings and sealing faces. Using pressure filters also allows more efficient filtration, thanks to the greater uniformity of the fluid flows obtained. The pressure pulsation damper therefore creates good conditions for ensuring clean, quiet and leak-free systems. PMC have long experience in the area of reducing pulsations created in modern hydraulic systems. Our TPD solution is a damper that has a high reduction of the base tone above 100 hz. This frequency is found on most systems with axial piston pumps, vane pumps or gear pumps from 1000 rpm. The TPD damper also creates low pulsation between the damper and the pump. There is no nitrogen gas inside the damper and it is a maintenance free product.

Marine pulsation damping


Bulk heads made of steel, with high pressure oil pipes passing through, can carry pulsations through an entire ship or fishing vessel. Pulsation dampers can make a huge difference in these applications especially in systems where pressures are constantly high. They also reduce the wear of seals in the system which reduce leakage on board.  
Industrial pulsation damping
Pulsations and noise can be captured inside the hydraulic power pack. Noise levels of 65 dBA can be achieved at 300 bar pressure. The TPD pulsation damper is one active part of the overall concept but there are also suction line technology and technology for sound traps in the ventilation system of power packs that helps achieve overall silence. PMC Hydraulics can offer a standard solution for silent power packs made in steel with one or more pump units equipped with electric motors ranging from 5,5 to 55 kW. Dampers are also often used in industrial press applications like extruding presses that work at high pressure for long periods of time.

Mobile pulsation damping

Pulsations can create problems in mobile systems. One example is truck applications with pump units that run constantly at high pressure. Trucks that transports food with hydraulic refrigerator units are one example. This can create vibrations and noise inside the truck cabin. Another example is mobile equipment running very close to living areas in harbors or similar applications. The demands on low noise level can be very high in cities near living areas. Hydraulic piston pumps without damping can create a sound with a pulsation frequency that travel a great distance and that sound can reduced in by adding pulsation damping. Another focus area is the demand for low leakage in mobile machine applications with high concern for oil leakage to the environment.