A wellhead safety valve control system for opening and closing subsurface and surface safety valves in a predetermined sequence and certain components used with such control system. Dump valves in bot

In carrying out the principles of the present invention, in accordance with embodiments thereof, apparatus and methods are provided which solve one or more of the above problems in the art of deep set

A safety valve for installation in a well to close the passage for effluent therefrom comprises a valve body of generally cylindrical shape, shut-off element in a lower part of this body, and a cylind

A blow-down safety valve having means for directing the fluids exiting therefrom along a flow path which assists the valve member to open and seat quickly without excessive bleeding.

A safety valve in combination with a resilient tube for preventing the free flow of fluid through the resilient tube comprises a valve body which is connected to a valve head of generally circular cro

A safety valve including a brass valve body having a through bore provided with a circular sharp-edged valve seat and another sharp edge. A valve stem carrying a ball valve and a biasing spring dispos

The invention is for a safety valve for a piping system. The safety valve has a cylindrical housing, a piston assembly with two disc-shaped pistons, each piston having at least one orifice defined the

For use with a safety relief valve, a pilot valve is disclosed. The preferred and illustrated embodiment of the pilot valve incorporates a pressure moved spindle within a housing, the housing being dr