Multi-stage High Pressure Drops VC Trim

Anti Cavitation Velocity Control – Liquid Applications

The Velocity Control Trim can is used for liquid applications where the pressure drop is high enough to cause severe cavitation and the energy being dissipated is significant enough to cause substantial damage to standard trims and pipe work.

The multistage design of the Velocity Control Trim eliminates cavitation and ensures the trim exit velocity is maintained at acceptable levels. As the liquid moves through the passages in the Velocity Control Trim the energy is dissipated through sharp direction changes, friction and turbulence.The total pressure drop is distributed over a series of stages and cavitation is prevented from occurring by ensuring the internal fluid pressure does not fall below the vapor pressure at any stage.The design of the VC Trim provides sufficient numbers of discrete pressure reduction stages to maintain the trim exit velocity below 23 m/sec (75 ft/sec).

Noise Attenuation Velocity Control – Gas Applications

The Velocity Control trim is used for vapour and gas applications where the pressure drop is high enough to cause high noise levels and the energy being dissipated is significant enough to cause substantial damage to standard trims and pipe work.

The Velocity Control Trim divides the flow into many small streams and utilizes expansion and contraction, friction, and changes in flow direction to convert the high upstream potential energy directly into heat. The multi stage design of the Velocity Control trim controls the Velocity Head through each stage of the trim at levels that do not create high noise or control valve induced vibration.

The Velocity Control Trim is also a technically superior and cost-effective alternative to conventional noise abating devices (i.e., silencers) in gas and vapor atmospheric vent applications. The Velocity Control Vent Stack effectively performs the duty of both the pressure let down valve and the atmospheric silencer, eliminating the need for the atmospheric vent silencer altogether. The Velocity Control Vent Stack is installed downstream of the valve, reducing the required size of the valve body and as a silencer is not required the total weight of the “system” is greatly reduced.