How to Operate Valves Subsea?
Several issues need to be considered to design and configure a subsea development controlled and operated over a significant distance. Various industries use subsea valves,…
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Rotary Gate Valves
Rotary Gate Valves
The rotary valves typically have low operational torques but high torques to damage. The added benefit of these products is if the valves are over-torqued and shear the end stops, they will continue to rotate without damaging the internals.
The small-bore subsea rotary valves are qualified at different pressure ratings up to 15,000psi [1034 bar] and 16,500 PSI [1138 BAR] – 1.65 X CWP seat test was also conducted (if the system is rated at 10,000 psi). Rotary Gate Valves are suitable for water depths to 3050m (10,000ft). Qualification testing is performed to the exacting standards of API 6A Appendix F PR2 and 17D 2nd Ed (Operable temperature range: -20F [-29C] to +350F [+177C] with non-operable temperature range: -50F [-46C] to +350F [+177C].
Design Features
- Proven Destec Metal to Metal Body to Bonnet Sealing Arrangement.
- Designed and tested to take total differential pressures from outside to in (10,000 ft hyperbaric conditions) and from inside to out (18,750psi shell test conditions).
- Sealing technology in several qualified Oliver Valvetek products.
Key Rotary Gate Valve Features:
- Position Indication
The Oliver Valvetek manual rotary gate valves are operated through a quarter (90degrees) turn. This provides the end-user with a simple visual indication to the ROV operator of the valve position. - Over-Torque Protection
The quarter-turn operation means that if the valve is over-torqued to a point where the end stops fail, the valve will simply continue to open and close. The valve can then be positioned in the open or closed position and without damage to the valve internals. - Low Operating Torque
Oliver Valvetek has achieved a low operating torque at full differential pressure by utilising fine controls on the spindle to bonnet bearing interface. - Panel Mountable
Oliver Valvetek can provide the end-user and operator with a varied and comprehensive range of operators and receptacles easily configurable to the designer ROV panel. - U-shaped flow passage through the valve.
The unique design of the flow passage through the Oliver Valvetek rotary gate valve minimises the potential flow losses. Flow tested to provide the end-user with accurate flow coefficients and excellent Cv value if there is a concern regarding flow rates.
| Rotary Gate Valves Specifications: | |
|---|---|
| Bore Sizes | 0.50 inch (12.7 mm) |
| Design Pressure | Up to 15,000psi (1034 bar) |
| Design Temperature | API 6A Class PX - 20F (-29C) to +300F (150C) |
| Water Depth | 10,000ft (3050m) |
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