(19)
(11) EP 0 038 034 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.11.1981 Bulletin 1981/44

(43) Date of publication A2:
21.10.1981 Bulletin 1981/42

(21) Application number: 81102711

(22) Date of filing: 09.04.1981
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 11.04.1980 US 139502

(71) Applicant: FMC CORPORATION
 ()

(72) Inventor:
  • Talafuse, Larry James
     ()

   


(54) Safety valve manifold system


(57) A hydraulic safety valve manifold system for providing positive opening and closing of a surface-controlled, sub-surface safety valve in a subsea well, including a shut-off valve which prevents leakage of well fluids to the outside environment if a leak should occur in the safety valve or in hydraulic lines which are connected to the hydraulic actuator of the safety valve. A hydraulic control line is connected to the safety valve actuator through a normally closed shut-off valve, and this line is also connected to the actuator of the shut-off valve to hold both the shut-off valve and the safety valve open when the line is pressurized. The hydraulic line is also connected to an actuator of a variable volume accumulator to empty the accumulator when the line is pressurized. When pressure in the hydraulic line is relieved the shut-off valve closes and the accumulator accepts fluid from the hydraulic actuator of the safety valve to insure that the safety valve closes.







Search report