TECHNICAL SPECIFICATION |
| SIZES |
| 1” to 16” (25mm to 400mm) |
| RATINGS |
| ASME 600-4500; API 6A 3,000 - 15,000 |
| BODY MATERIALS |
| Carbon Steel / Low Temperature Carbon Steel / Alloy Steel / Stainless Steels / Duplex & Super Duplex / Inconels |
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| TRIM THROTTLING MATERIALS |
| Tungsten Carbide / Stellite / Ultimet |
| API 6A MATERIAL CLASSES |
| HH, FF, EE, DD |
| DESIGN STANDARDS |
| ISO10423, API 6A, ANSI B16.34, ASME VIII, PED, ATEX, NACE MR-01- 75, NORSOK or customer specific. |
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TRIM DESIGN
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| TRIM DESIGN OPTIONS FOR THE SERIES 73 CHOKE VALVE RANGE |
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| All Series 73 Choke Valves use a low-pressure recovery, High Friction trim design. This protects the vital pressure-containing boundaries of the valve against damage erosion and cavitation. It does so by dissipating and controlling velocity, pressure, energy and turbulence within the confines of the trim. Dependent on the needs of your project, the Series 73 range can work with single or multi-stage trims. |
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| Multi-stage trims can protect the valves further against the effects of cavitation and high velocity erosion. Holes in the trims are aligned in such a way as to force individual jets to change direction repeatedly as they pass through the chambers between sleeves. This results in a controlled, steady reduction in pressure and velocity control preventing the onset of cavitation. |
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VECTOR™ – VELOCITY CONTROL CHOKE TRIM TECHNOLOGY
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VELOCITY CONTROL TRIM
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| THE VECTOR™ VELOCITY CONTROL TRIM |
| On the most onerous applications where there are extreme pressure drops and very high velocities, the VECTOR™ solid Tungsten Carbide Velocity Control trim would be utilised. |
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| The main features of this trim are: |
| Up to 10 stages of discrete velocity control. |
| Large flow passages to allow solid contaminates to pass through the trim. |
| Premium-grade solid tungsten carbide critical control / throttling elements. |
| Various trim sizes can be used in different choke valve body sizes, to suit a wide range of process control parameters. |
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| Resilient balance seals complete with scraper rings. |
| Metallic ‘brick stopper’ to prevent solid particles impacting directly on to the tungsten carbide. |
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'HF' HIGH FRICTION CARTRIDGE TRIM |
| CARTRIDGE TRIM |
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| THE HF HIGH FRICTION CARTRIDGE TRIM |
| This option is used on most applications to protect against erosion and cavitation. |
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| The main features of this trim are: |
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| Divides the main flow into many small streams, increasing turbulence and noise peak frequency and maximising the pipe wall transmission loss. |
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| High energy levels, pressure and velocity are dissipated within the confines of trim – avoiding erosion damage. |
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| Design of final stage ensures low-velocity non-interacting jets, avoiding unnecessary noise generation in the choke outlet. |
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| Various trim sizes can be used on different choke valve body sizes, to suit a wide range of process control parameters. |
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| The inner tungsten carbide control elements are protected impact damage by the outer cartridge sleeve. |
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HIGH FRICTION-LCV ANTI-EROSION TRIM |
| ANTI-EROSION TRIM |
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| THE HF-LCV ANTI-EROSION TRIM |
| Some applications come with the additional risk of sand contamination. The patented HF-LCV trim has been designed to meet the challenges of such demanding and erosive conditions. It has been independently tested and proved highly effective. |
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| The main features of this trim are: |
| Premium-grade solid tungsten carbide critical control / throttling elements. |
| Solid tungsten carbide sacrificial plug nose. |
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| Shrouded plug seat, protected the highly erosive flow path. |
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| Hole development dead band – the seating area is removed the main flow area. |
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| Stem scrapers prevent migration of sand into the stem seal area. |
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| Resilient plug seals with scraper rings. |
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| Metallic ‘brick stopper’ prevents solid particles impacting directly onto the tungsten carbide. |
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| Optional tungsten carbide wear sleeve. |
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