425results about How to "Avoid repairs" patented technology

The present invention is a new liner assembly for use in pipes constructed from a flexible liner formed from a resin absorbent material. A compressible material, such as stitch-bond or foam, is attached to one or more sides of the liner for forming a taper along the compressible material when the liner is cured in place in the pipe using a curable resin and an expandable bladder to shape the liner to match the inside shape of the pipe. A taper is formed along the compressible material from the inside of the liner down to the inside of the pipe in which the liner is placed. As a result, a taper prevents accumulation of solid materials at the location of the pipe repair and thus prevents future clogging of the pipe at the repair.

The invention relates to the technical field of stress measurement, in particular to a triplex hydrofracturing stress measurement push-pull valve which comprises a fracturing part, a water release part, a setting part and a valve body. The setting part is internally provided with a setting water passage communicated with the outside; the fracturing part is internally provided with a fracturing water passage communicated with the outside; the water release part is internally provided with a water release hole communicated with the outside; the valve body is provided with a water inlet hole communicated with one end of the valve body, the outer wall of the valve body is provided with a water outlet groove, and the bottom of the water outlet groove is provided with a water outlet hole communicated with the water inlet hole. The fracturing part, the water release part and the setting part are in sequentially coaxial connection, and the valve body sequentially penetrates the center hole of the setting part and the center hole of the water release part to be communicated with the center hole of the fracturing part. The valve is more convenient to assemble and maintain, problems of narrow and long internal space and difficulty in maintenance and replacement of seal rings in the prior art are avoided, consideration of space and distance limitations in seal ring mounting and demounting is avoided, and accordingly possibility is provided for extension and full play of each function.

The heald shafts of a power loom are driven by electric D.C. or A.C. motors which have an external rotor or an armature connected to the respective heald shaft through two articulated couplings, for example snap locks, and a push-pull rod. The motors receive control signals from a computerized controller for reversing the motion direction of the external rotor or armature. The stators of the motors are rigidly mounted on a fixed axis secured to the loom frame.

The present invention describes methods and compositions for improving the therapeutic efficacy of therapeutic agents previously limited by suboptimal therapeutic performance by either improving efficacy as monotherapy or reducing side effects. Such methods and compositions are particularly applicable to bisantrene or derivatives, analogs, or prodrugs thereof.

The present invention relates to a hydraulic rock breaking device, a protection valve and a method of operating a hydraulic rock breaking device. The rock breaking device comprises a percussion device to which pressure fluid is fed along an inlet channel. The inlet channel is provided with a protection valve arranged to monitor the volume flow of pressure fluid flowing through it. If the flow is larger than what has been preset, the protection valve closes, at least partly, the connection through it, protecting thus the percussion device against too high an input power. The protection valve comprises a throttle which generates a pressure difference the magnitude of which is dependent on the fed volume flow. Information on the pressure difference is utilized in controlling the protection valve.