Overview
Product features
Material selection – The HPHT needle valve materials of construction have been selected for this demanding application based on extensive Research and Development (R&D) testing and evaluation. Oliver Valvetek uses either UNS N06625, UNS N07725, UNSN09925 or UNS N07718 in our HPHT valve construction.
Operator – The needle valves can be supplied with a number of different operators, including different shaped adaptors for connection to extension rods for ROV operation or intervention.
Operating Threads – The range of subsea HPHT needle valves is a medium torque partial turn design.
Anti-Blowout Spindle – Each needle valve size has a spindle designed for maximum torsional (Torque to Damage) strength and has a back seat to provide an anti-blowout safety feature.
Environmental Seals – All needle valves have seals to prevent the ingress of seawater. These have been tested to water depths equivalent to 10,000 feet (3050m).
Body seals – Body to bonnet sealing is by using metal to metal gasket.
Gland Seals – The gland seal within each needle valve has been designed with a spring energised lower seal to prove dynamic adjustment of the packing gland seal in response to pressure changes. This feature ensures leak-free spindle sealing with no requirement for adjustment.
Non-Rotating Tip – The HPHT needle valve design has a non-rotating, self-centring, anti-galling spindle tip, which gives a positive bubble-tight shut-off.
Traceability of Materials – All the components within an Oliver subsea needle valve have material traceability. The needle valve body, tip, spindle, seal housing are manufactured as standard to API 6A PSL3. The complete needle valves are individually serialised and are provided with material and pressure test certificates to BS EN 10204 3.1 certifications. Optional EN 10204 with the intent of a 3.2 type certification option is also readily available (EN 10204 3.2 true mill witnessed shall be assessed for availability upon request).
