SIZES : 1" to 36"(25mm to 900mm)
RATINGS : ASME 150 to ASME 4500
WHY CHOOSE A SERIES 1200/7200 VALVE?
- Robust, proven design.
- Streamlined flow passages to optimisze capacity.
- Stable flow control with high rangeability.
- Designed to enable increased end-connection sizes for simpler pipeline installation.
- Reduced cost due to elimination of pipe reducers, additional gaskets and bolting.
- Large range of trim designs available, from single-stage, multi-hole cage trims to multiple-stage, low-noise, cavitation-control designs.
- Wide range of supplementary noise-control components, silencers and dynamic attenuators available.
- Fully stellited/tungsten carbide trim materials available.
- Balanced or unbalanced plug designs.
- Controlled velocity design principle.
- Wide range of CVs per body size allowing for large changes in process conditions.
TRIM DESIGNS :
A huge range of trim designs is available to cover all applications in your industry sector. The standard design is a low-noise anti-cavitation trim (High Friction), which is complemented by several multi-stage designs with up to nine stages (20 turns) of let down.
- HF/XHF - High Friction trim :
Suitable for most process-control applications, this low pressure recovery trim design gives excellent cavitation and noise reduction. For liquid applications the flow should be directed over the plug, so that it is split into many radial jets and exits the trim through the valve seat. For more severe applications the trim\\\'s operational life can be extended by using stellite or tungsten carbide inserts.
For gas / vapour services the preferred flow direction is under the plug, which results in lower acoustic efficiency causing lower transmitted noise. Where further noise reduction is required, a cage with smaller holes can be specified - this is the XHF design.
- HFT (High Friction Triple ) trim
Used on applications where noise or cavitation would otherwise be a problem. If not properly controlled, high pressure-drop liquid applications can severely damage the valve.
To avoid the destructive forces of cavitation the pressure drop needs to be apportioned across a number of stages of let down. The HFD (two stages) and HFT (three stages) trims apportion the pressure drop equally across two or three stages. The stages take the form of concentric sleeves drilled with radial holes within grooves that form distinct flow galleries. These are specified on less severe applications.
- HFL/HFG (High Friction Liquid /Gas ):
The HFL or HFG design incorporates two or more concentric sleeves (HFL 2, 3, etc), each with a multitude of grooves incorporating radial holes. The grooves line up to create a tortuous radial flow path which dissipates energy within the cage by the combined effect of flow splitting and impingement. This also significantly reduces the likelihood of cavitation because the final stage of let down has a relatively small pressure drop.
- HFQ/XHFQ (Low -noise trim - gas applications):
These low-noise trims include HFQ1/XHFQ1 (three stage) and HFQ2/XHFQ2 (five stage) models. The preferred flow direction is \\\"under\\\" the plug, enabling the optimum flow area to increase as the flow passes through each stage of the trim.
The result is a very low trim exit velocity and very high levels of noise attenuation. The flow geometry means that the process fluid enters the cage radially and passes through subsequent sleeves in a tortuous path, resulting in high frictional and impingement losses. Shock wave formation is controlled by jet impingement on the sleeves, which has been shown to reduce noise generation.