Abstract: An indicator for a pilot, particularly a two-line pilot to visually indicate whether a pilot has responded to a pressure condition within a flowline which pressure condition is outside a predetermined range. The visual indication also indicates whether the pressure condition is above or below the predetermined range.

Abstract: An emergency shut-down system to close a gate valve in a pipeline and therefore terminate flow. The closing action is initiated when a pilot valve senses pressure in the pipeline outside predetermined limits. This reduces the signal pressure in the system which, in turn, causes a fluid dump from the gate valve actuator which closes the gate valve and terminates fluid flow in the pipeline. The system is reactivated by manually pumping the system which re-opens the gate valve and allows fluid flow in the pipeline to again continue.

Abstract: A two line pilot valve used to exhaust hydraulic fluid from a control circuit when the operating conditions within which a flowline is intended to operate are outside of predetermined limits. The pilot exhausts fluid within a control circuit to a reservoir which allows a dump valve to dump fluid from an actuator which causes the actuator to close the flowline. The pilot has a first poppet sleeve which contacts an o-ring. When the poppet sleeve and o-ring separate, fluid is allowed to pass from the inlet port of the pilot to the exit port and thereby exhaust the fluid of the control circuit.

Abstract: An emergency shut-down system to close a gate valve in a pipeline and therefore terminate flow. The closing action is initiated when a pilot valve senses pressure in the pipeline outside predetermined limits. This reduces the signal pressure in the system which, in turn, causes a fluid dump from the gate valve actuator which closes the gate valve and terminates fluid flow in the pipeline. The system is reactivated by manually pumping the system which re-opens the gate valve and allows fluid flow in the pipeline to again continue.

Abstract: A cushion connector (10) used for above ground drilling has pin (11) and box (12) components at opposite ends. A housing (13) extends axially between the pin and box components. A drive spline (22) is operably connected to one of the components and extends outwardly from the axis (23) of the cushion connector (10). A plurality of drive blocks (24) extend inwardly from the inside diameter of the housing (13) and engage with keyways (69) of the drive spline (22). Drive lugs (71) connected to the inside of the housing (13) act on the drive blocks (24) and resilient cushion blocks (70). A spring (30, 60) extends between the pin (11) and box (12) components within the housing (13) and exerts axial force between them. The drive splines (22) are coaxial with the connector (10) and move axially under operation. Cushion blocks (70) are provided between the drive blocks (24) and drive lugs (71).

Abstract: A pressure responsive pilot control valve has a spool which is movable by a metal diaphragm sensing the pressure in a flowline. The spool includes two poppet seal rings mounted thereon, the poppet seal rings having concentric axes and which are used for opening and closing fluid ports. The fluid ports are opened and closed for the purpose of sending a signal to a latching relay valve to bleed off a shut in valve actuator which will terminate flow in the flowline. The poppet seal rings of the pilot move responsive to a high or a low pressure condition. A low pressure spring is provided for measuring a low pressure condition and a high pressure spring is provided for measuring a high pressure condition.

Abstract: An engine air shutdown valve comprising a gate which is movable from a first position wherein the air flow passage of an engine is relatively unimpeded to a second position where the air flow passage is closed thereby terminating operation of the engine. A trip spindle maintains the gate in its open position with a ball release. Upon activation of the ball release, the gate moves parallel to the direction of air flow through the passage to terminate the air flow.

Abstract: An engine shutdown valve comprises a housing and a gate movable within a housing between a first position where the air flow through the shutdown valve is substantially unrestricted to a second position where the opening is restricted thereby stopping air flow. The gate is pivotable about an axis and a drive is located concentrically about the axis to rotate with the gate. The drive has a recess which is engageable by a piston movable between a first position where the gate is held in its latched position and a second position out of engagement with the recess so as to allow the gate to move to a position where the air passageway is closed. The piston assembly is located substantially wholly within the housing with only the piston of the piston assembly extending therefrom. The housing is divided into two halves joined together with cap screws having axes transverse to the axis of rotation of the gate.