Abstract: A reciprocating plunger pump fluid end having increased material thicknesses in typical high stress concentration areas includes locating valves in spherically segmented shaped suction and discharge bores adjacent to chamfered transition areas to provide for reduced stress concentrations, resistance to fatigue failure and erosion and ease of access for maintenance. Among other features the housing includes a valve retainer assembly integrally mounted inside the housing which includes a profile to reduce stresses in the bores and facilitate access for replacement of internal components.

Abstract: A reciprocating plunger pump fluid end having increased material thicknesses in typical high stress concentration areas includes locating valves in spherically segmented shaped suction and discharge bores adjacent to chamfered transition areas to provide for reduced stress concentrations, resistance to fatigue failure and erosion and ease of access for maintenance. Among other features the housing includes a valve retainer assembly integrally mounted inside the housing which includes a profile to reduce stresses in the bores and facilitate access for replacement of internal components.

Abstract: A field portable pipe-mounted pipe cutting system with integral controls. The system includes a torch carriage assembly having a torch for cutting a cylindrical pipe. A saddle and cap ring assembly is secured to the pipe. A ring gear engages the saddle and cap ring. At least one drive gear engages the ring gear. A drive gear step motor rotates the drive gear. A motion control module controls movement of the step drive motor. The lead screw assembly moves the torch carriage assembly longitudinally parallel to an axis of the pipe. A lead screw step drive motor drives the lead screw assembly and a motion control module controls movement of the lead screw step drive motor.

Abstract: A coupler for mating high power electrical connectors as may be used in mining environments includes a frame 39 upon which are mounted a first retaining assembly 11 and a second retaining assembly 12 for retaining respective electrical connector assemblies. The retaining assemblies may be brought relatively toward and away from each other by a translation assembly which comprises a rack 6 mounted to the frame and which meshes with a pinion 7. The pinion 7 is coupled to a drive train of the second retaining assembly which is driven by an axle 16, to one end of which there is mounted a wheel 4. Accordingly, upon a worker rotating wheel 4 the second retaining assembly 12 may be brought toward and away from the first retaining assembly 11. A rotation assembly is incorporated into one of the retaining assemblies for rotationally aligning the connector assemblies.

Abstract: Bypass valve assembly that selectively establishes a bypass path for a fluid delivery system and having a body member with a fluid inlet and a bypass fluid outlet, a slidable piston assembly and a slidable cage assembly. Spring members bias the piston assembly and the cage assembly to a closed position to prevent fluid flow from the fluid inlet to the bypass fluid outlet when the delivery pressure is between an upper first threshold pressure value and a lower second threshold pressure value. When the delivery system pressure exceeds the first threshold pressure value, the piston assembly is moved to a first open position that permits fluid flow to the bypass fluid outlet; and when the delivery system pressure is less than the second threshold pressure value, the piston assembly is moved to a second open position to permit fluid flow to the bypass fluid outlet.

Abstract: An improved secure communication arrangement separates the tasks of identity verification and certificate issuing, which allows a disassociating of the long-term binding between Alice and her public/private key pair. This is accomplished by a registration authority issuing a password to Alice once it is satisfied of Alice's bona fide. Thereafter, whenever Alice wishes to communicate with Bob, she contacts a certification authority, identifies herself with the password and obtains a private key and a corresponding short-lived certificate. The certificate typically includes Alice's name and a public key in plaintext, and a signature. The signature is derived by hashing the plaintext portion of the certificate to obtain a value, and encrypting the value with the CA's private key.