oliver valvetek offers a specialist range of engineered-to-precision subsea high pressure high temperature (hpht) actuated gate valves. available in a 1/2″ nominal bore, having an operating and qualfied pressure rating up to 20,000psi [1380 bar]. the qualifed operating temperature range of the hpht gate valve is -29°c to 155°c (-20°f to 311°f) . qualified water depth rating of 10,000ft [3050m].
hydraulically actuated subsea hpht gate valves provide users with a low flow restriction metal to metal seat sealing isolation for applications such as chemical injection lines on hpht christmas trees and hpht manifold structures. the gate and seat sealing faces used within the valves utilise fully qualified tungsten carbide hard facing (hvof) technology to provide gas-tight sealing.
the oliver valvetek hpht hydraulic gate valve range of through conduit slab gate valves is provided with hydraulically actuated (fail close) operation. the actuator is a coil spring demountable design.
like our standard gate valve range, hpht hydraulically actuated gate valves are also suitable for rov override intervention. our current hydraulically actuated subsea gate valves have been used extensively since 1997 by our customers worldwide for small and large oil, gas and petrochemical projects.
qualification testing is performed to the exacting standards of api 6a appendix f pr2 and 17d 2nd ed. independent primary and secondary gland seal validation – 600 hydraulic cycles and qualification was 3rd party witnessed and approved.
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