HPT™ Subsea Production Gate Valves are qualified to API 17D for 10,000 feet of water depth. These can be either failsafe-close or failsafe-open design. T3's HPT Subsea actuator is unique in that it utilizes an integral hydrostatic pressure compensating design that avoids ANY sea-water ingress into the spring chamber and also removes the need for an external hydrostatic compensating unit. They are also available with options such as ROV override.
The valves are available in various configurations such as flanged ends, hubbed ends or studded ends. Dual block valve configurations are also available. Working pressure of the actuator is 3000 psi. The failsafe-close subsea actuator does not need any control pressure assistance for its closure against full differential of the gate valve working pressure, as spring force alone is sufficient to close the valve. Control pressure ports are provided on both 'Open' and 'Close' sides of subsea actuator. Ease of maintenance is achieved through a quick disconnect mechanism between the actuator and the gate valve. This allows quick and easy removal and replacement of stem packing. The spring remains housed within the actuator all the time and is not exposed to handling by a field operator.
HPT Valve Seal Assembly – US Patent 6,664,572
HPT Subsea Actuator – US Patent 6,783,017 B2
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