A reducing valve having a body, inlet and outlet ports formed therein, a spool slidably inserted in the body, lower and upper covers of the body, a poppet valve formed in the upper cover of the body for adjusting the pressure of a fluid in the outlet port, and an adjusting device for adjusting the position of the spool in the body so as to prevent generation of a surge pressure in the outlet port.

Polymers containing 2-acrylamido-2-methylpropane sulfonic acid are useful as friction reducers for aqueous fluids flowing through a conduit, especially for the aqueous hydraulic fracturing of subterranean formations.

A reducing polymer comprising dihydrolipoic acid bound to a polymeric carrier, the carrier being advantageously a derivative of cellulose, of Sephadex, of Sepharose, of polyacrylamide or of polystyrene. Preferred derivatives used are the amino-(lower alkyl) derivatives. The reducing polymers are produced by covalently binding lipoic acid to a suitable polymeric carrier and reducing the thus obtained polymer. A suitable reducing agent is sodium borohydride.

Use of poly (dimethylaminomethyl acrylamide) as a friction reducer for aqueous fluids flowing through a conduit, especially for the aqueous hydraulic fracturing of subterranean formations.

A proportional reducing valve is disclosed wherein an "entering" fluid flow is received through an inlet port in communication with a first valve bore containing a first reciprocal valve member. The first bore is connected through an intermediate passageway to a second parallel valve bore containing a second reciprocal valve member. The second valve bore is in communication with an outlet port through which fluid received from the first valve bore through said passageway exits from the valve hou...

A pair of inflatable Bermuda-type shorts to be worn for exercising and weight reducing.

A coupling for connecting the ends of two pipes of different diameters comprised of a body member having a radially extending wall and sleeve portions which extend in opposite directions from the radial wall. Each sleeve portion has associated with it a series of bolts extending from ears or lugs on the sleeve portion to followers which engage sealing rings. The bolt heads at each of the sleeve portions are arranged adjacent to and are circumferentially aligned with each other so that during ins...

A roll assembly for reducing rod and the like in which the rolls are secured against rotation on their arbor by force applied to the sides of the rolls in the direction of the axis of the arbor. The force is applied by an hydraulic nut or annulus having a cavity which is sealed pressure tight by a deformable membrane. An annular shoe is interposed between the membrane and the rolls. The cavity is supplied with fluid under pressure and is deflected exerting force on the shoe which is transmitted ...

The present invention relates to platelet-shaped pigments that comprise a layer obtained by calcining TiO.sub.2/SiO.sub.y or TiO.sub.2/metal, especially TiO.sub.2/AI (0.03.ltoreq.y.ltoreq.1.95, especially 0.03.ltoreq.y.ltoreq.1.8, more especially 0.70.ltoreq.y.ltoreq.1.8), and to the use thereof in paints, textiles, ink-jet printing, cosmetics, coatings, plastics, printing inks, in glazes for ceramics and glass, and in security printing. The pigments according to the invention are distinguished ...

The invention relates to a device for shredding plastic objects [(2)], provided with a spiral-shaped housing [(3)] in which a carrier member [(4)] is rotatably mounted. The housing [(3)] has an opening [(8)] arranged in its upper surface [(5)] for feeding objects [(2)] for shredding and an opening [(9)] arranged in its side surface [(7)] for discharging shredded material [(10)]. The discharge opening [(9)] is herein bounded by a cutting edge [(11)] and the carrier member [(4)] has a number of an...