A safety valve including a brass valve body having a through bore provided with a circular sharp-edged valve seat and another sharp edge.Safety Valves A valve stem carrying a ball valve and a biasing spring disposed in the through bore. A cap member screwed through onto the brass valve body and causing the ball valve to be seated on the sharp-edged valve seat and causing the ball valve to be positioned in close proximity to the other sharp edge.Plug Valves A plurality of radially vent holes formed in the brass valve body for venting fluid pressure to atmosphere when the ball valve becomes unseated from the sharp-edged valve seat.GLOBE VALVE A lock nut for locking the cap member in position and a spring pin carried by the valve stem to permit the ball valve to be manually opened. 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.

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