Abstract: A disk display includes a vessel having a vessel cap on a first end of the vessel, the vessel cap having a wall defining an opening, the wall including a disk support extending radially inward into the opening; and a disk retainer element that is securable within the vessel cap to hold a disk against the disk support. The disk retainer element may seat against the vessel cap using cooperating elements on the vessel cap and disk retainer element that define a trajectory for the disk retainer element to move along when the disk retainer element is being secured in the vessel cap, in which the trajectory flattens with increased insertion of the disk retainer element in the vessel cap, or the trajectory forms a helix having a continuously increasing helix angle. A knob and groove arrangement may be used for the cooperating elements.

Abstract: A pressure switch is disclosed, comprising: a spool forming a pressure sensitive end; an actuating rod extended into the spool and slidable over a limited range within the pressure switch under external fluid pressure on the pressure sensitive end; a switch housing containing a switch operatively connected to the actuating rod; and a cylindrical connector terminating in a first axial end and a second axial end, the cylindrical connector being threaded into the spool at the first axial end and into the switch housing at the second axial end. A pressure switch is also disclosed comprising: a housing defining an interior bore that terminates in a pressure sensitive end of the housing; an actuating rod slidable over a limited range within the interior bore under external fluid pressure on the pressure sensitive end; a switch, within the housing, operatively connected to the actuating rod; and outwardly extending fins mounted on the housing.

Abstract: A pressure switch is disclosed, comprising: a spool forming a pressure sensitive end; an actuating rod extended into the spool and slidable over a limited range within the pressure switch under external fluid pressure on the pressure sensitive end; a switch housing containing a switch operatively connected to the actuating rod; and a cylindrical connector terminating in a first axial end and a second axial end, the cylindrical connector being threaded into the spool at the first axial end and into the switch housing at the second axial end. A pressure switch is also disclosed comprising: a housing defining an interior bore that terminates in a pressure sensitive end of the housing; an actuating rod slidable over a limited range within the interior bore under external fluid pressure on the pressure sensitive end; a switch, within the housing, operatively connected to the actuating rod; and outwardly extending fins mounted on the housing.

Abstract: An apparatus for sensing pressure is provided comprising a housing, electronics, a pressure sensor and a secondary seal. The housing comprises an interior bore and a first end, with the interior bore forming an opening at the first end. The electronics may be disposed in the interior bore. The pressure sensor is mounted at the first end of the interior bore. The pressure sensor may be operatively connected to send signals to the electronics in response to external fluid pressure. The pressure sensor may, at least in part, form a primary seal at the first end of the interior bore. The secondary seal may be disposed in the interior bore in between the pressure sensor and the electronics. The secondary seal may be configured to act as a backup seal to the primary seal. The secondary seal provides an added degree of safety from high pressure pipeline contents.

Abstract: An apparatus for sensing pressure is provided comprising a housing, electronics, a pressure sensor and a secondary seal. The housing comprises an interior bore and a first end, with the interior bore forming an opening at the first end. The electronics may be disposed in the interior bore. The pressure sensor is mounted at the first end of the interior bore. The pressure sensor may be operatively connected to send signals to the electronics in response to external fluid pressure. The pressure sensor may, at least in part, form a primary seal at the first end of the interior bore. The secondary seal may be disposed in the interior bore in between the pressure sensor and the electronics. The secondary seal may be configured to act as a backup seal to the primary seal. The secondary seal provides an added degree of safety from high pressure pipeline contents.

Abstract: A pigging ball valve with a housing and ball core supported for rotation within the housing. The ball core sits on a valve seat, which is supported by a seat carrier. The valve seat carrier has three distinct diameters that locate the seat in the housing and thus provides an anti-cocking feature. A seat insert has a pressure sealing surface and wiper lip on the outer diameter of the pressure sealing surface. An internal seat deflector ring is provided inside of the pressure sealing surface. The seat carrier is spring loaded.

Abstract: A pin and box of a threaded connection are provided with interference fit metal-to-metal seals on both sides of a reverse thread section. The pin nose and box nose respectively are received in undercuts in the box shoulder and nose shoulder. The pin nose and box nose engage the respective shoulders at the same time on make-up. The thread section has a low profile, and the pin and box are kept short to reduce bending stresses.

Abstract: A hydraulic control circuit, comprising a control line connected to a device to be controlled by fluid pressure in the control line; a time-out valve on the control line, the time-out valve having a time-out period during which time-out period operation of the time-out valve is delayed after actuation of the time-out valve; a pump connected to the control line for pressurizing the control line with fluid; and an arming valve operated by pressure on an arming line connected to the control line and the arming valve being connected to the time-out valve to reduce the time-out period in response to pressure on the control line.

Abstract: A hydraulic control circuit, comprising a control line connected to a device to be controlled by fluid pressure in the control line; a time-out valve on the control line, the time-out valve having a time-out period during which time-out period operation of the time-out valve is delayed after actuation of the time-out valve; a pump connected to the control line for pressurizing the control line with fluid; and an arming valve operated by pressure on an arming line connected to the control line and the arming valve being connected to the time-out valve to reduce the time-out period in response to pressure on the control line.

Abstract: A pig injector has a magazine having a plug at one end and connected to a pig injector valve at the other end. The pig injector valve has a rotatable pig receiving chamber with a length L. Plural pigs of length L between rounded ends are positioned end to end within the elongate interior cavity of the magazine. A method of injecting pigs into a pipe at a pig injector valve comprising: (a) storing plural pigs in a magazine connected to the pig injector valve; (b) rotating the ball of the pig injector valve to be in position to receive a pig and close the pipe; (c) moving a pig from the magazine into the pig injector valve; (d) rotating the ball of the pig injector valve to open the pig injector valve and release the pig in the pipe; (e) moving the pig away from the pig injector valve with fluid pressure in the pipe; and subsequently repeating steps (b)-(e) with a second pig. Steps (b)-(e) may be repeated plural times and at regular intervals.

Abstract: A hydraulic control circuit for a hydraulic actuator, including a high-low pilot valve having a sensing port for connection to a flow line. A single pressure line connects the high-low pilot to a hydraulic actuator. A second line connects the high-low pilot to a reservoir. A normally closed relief valve is connected to the single pressure line for relief of excessive pressure. A normally closed override valve is connected to the single pressure line for manual override of circuit controls. A pump is connected to the single pressure line for pressuring the single pressure line. The hydraulic control circuit has a normally open time out valve on the single pressure line, the time out valve being set to close a pre-set time interval after being manually activated, to isolate the high-low pilot, from the single pressure line to the hydraulic actuator, until the time out period has elapsed. The override valve is connected to the single pressure line between the time out valve and the hydraulic actuator.

Abstract: A pig injector has a magazine having a plug at one end and connected to a pig injector valve at the other end. The pig injector valve has a rotatable pig receiving chamber with a length L. Plural pigs of length L between rounded ends are positioned end to end within the elongate interior cavity of the magazine. A method of injecting pigs into a pipe at a pig injector valve comprising: (a) storing plural pigs in a magazine connected to the pig injector valve; (b) rotating the ball of the pig injector valve to be in position to receive a pig and close the pipe; (c) moving a pig from the magazine into the pig injector valve; (d) rotating the ball of the pig injector valve to open the pig injector valve and release the pig in the pipe; (e) moving the pig away from the pig injector valve with fluid pressure in the pipe; and subsequently repeating steps (b)-(e) with a second pig. Steps (b)-(e) may be repeated plural times and at regular intervals.

Abstract: An improved threaded joint for connecting a first tubular member, for example a valve housing, with an outer end having interior threads with pitch W and terminating in a shoulder. A second tubular member has an exterior threaded end and a flanged end. A shoulder extends outwardly of the second tubular member intermediate the threaded and flanged ends. A flange at the flanged end has N equally circumferentially spaced connectors. One of the first shoulder and second shoulder includes a portion that is elastically deformable over a distance at least equal to W/N so that connectors in the flange may be aligned with connectors in a connecting flange of a pipe line. A side entry cap is disposed in the valve assembly. The side entry cap includes a threaded portion and a sealing portion inward of the threaded portion, the threaded portion being cylindrical and the sealing portion having an exterior surface forming a conical section increasing in diameter outward.

Abstract: A pressure switch has a housing with an interior bore extending from one end to the other. A rod slidable within the bore and operated by external fluid pressure extends between a piston at one end of the housing and a mechanically operated electrical switch at the other end of the housing. A spring is disposed about the rod between a first stop on the rod and a second stop on the housing. The spring provides resistance against movement of the rod under external pressure. The resistance of the spring to movement is adjusted by a sleeve engaging the spring, with the sleeve threaded into the bore of the housing for movement longitudinally within the housing. A split ring wedged between two other rings resists movement of the rod to longitudinal movement.

Abstract: A pressure actuated switch has a diaphragm mounted across a piston having a piston head. Movement of the piston under pressure variations acting on the diaphragm actuates the pressure switch. A support disc is provided for the diaphragm, the support disc being mounted between the diaphragm and the piston. The support disc is preferably made of a high tensile elastic material and has an outer annulus that extends beyond the piston head, an inner disc that is smaller in diameter than the piston head; and a flexible intermediate annulus cantilevered between the outer annulus and the inner disc.

Abstract: A drill stabilizer is formed of housing with a mandrel extending from the housing between a first shoulder and a second shoulder, the mandrel having a mandrel axis and an outer diameter adjacent the first shoulder, and at least three stabilizing rollers mounted sequentially along the mandrel between the first and second shoulders. Each stabilizing roller has an axis of rotation radially offset from the mandrel axis in an offset direction and distributed symmetrically around the mandrel axis. The diameter of each stabilizing roller is such that each stabilizing roller has a perimeter that extends further radially outward than the outer diameter of the housing in the offset direction of the respective stabilizing roller and does not extend further radially outward than the outer diameter in the direction opposite to the offset direction.

Abstract: A pressure switch has a housing with an interior bore extending from one end to the other. A rod slidable within the bore and operated by external fluid pressure extends between a piston at one end of the housing and a mechanically operated electrical switch at the other end of the housing. A spring is disposed about the rod between a first stop on the rod and a second stop on the housing. The spring provides resistance against movement of the rod under external pressure. The resistance of the spring to movement is adjusted by a sleeve engaging the spring, with the sleeve threaded into the bore of the housing for movement longitudinally within the housing. The sleeve includes plural radially extending slots disposed around the sleeve. A port in the housing allows access to the sleeve and a cover is provided for the port. The cover includes a ring disposed around the housing and threaded onto the housing over the port.