Abstract: Provided is an electric valve, including a valve seat and a valve needle, and the valve needle is mounted in the valve seat; a valve core, which is mounted at an end of the valve seat, and the valve core forms a valve opening; a driving assembly, which drives the valve needle to axially move so as to open and close the valve opening; the valve core is made of a non-metal material, an inner wall or an end face of the valve core forms a sealing face, and the sealing face and an outer wall face of the valve needle form a soft sealing structure. Through the soft sealing structure composed of the valve core and the valve needle, the technical problem of poor sealing performance of the electric valve can be solved.

Abstract: Disclosed are a valve body connection structure and a valve assembly with the valve body connection structure. The valve body connection structure includes: a first connector including a first connection part and a first plug-in part, wherein the first connection part is fixedly connected to the main valve, and the first plug-in part is disposed on the first connection part; and a second connector including a second connection part, a second plug-in part and an extension part, wherein the second connection part is fixedly connected to the pilot valve, the second plug-in part is disposed on the second connection part, the first plug-in part matches the second plug-in part in an insertion manner, the extension part is disposed on the second connection part, and the extension part is provided with an assembly hole allowing a pipeline of the pilot valve to pass through.

Abstract: A check valve is provided. The check valve includes a valve body and a piston unit. The valve body includes a valve cavity and a valve port. The valve body is provided with an inlet and an outlet. The valve port is located between the inlet and the valve cavity. The outlet is in communication with the valve cavity. The piston unit is capable of moving in the valve cavity along an axis of the valve body to open/close the valve port. The valve cavity includes a flaring portion. Along the axis of the valve body, a flow area of a cross section of the flaring portion is greater than a flow area of a cross section of the valve port.

Abstract: A valve device is provided, including a valve body unit and a valve seat. The valve seat is provided with a mounting cavity, and an end of the valve body unit is mounted in the mounting cavity. The valve device further includes a limiting unit, an outer side wall of the valve seat is provided with a mounting hole in communication with the mounting cavity along a radial direction of the mounting cavity, a side wall of the mounting cavity is recessed to form a mounting groove corresponding to the mounting hole, an end of the limiting unit extends into the mounting cavity from the mounting hole and is inserted into the mounting groove, and the limiting unit that extends into the mounting cavity abuts against the valve body unit to perform limiting along an axial direction and a circumferential direction between the valve body unit and the valve seat.

Abstract: The present disclosure relates to the technical field of automobiles, and discloses a control method, a control apparatus, and an electronic expansion valve. The control method includes: collecting first jumping signals in real time and recording a first time of collecting each first jumping signal; collecting second jumping signals in real time and recording a second time of collecting each second jumping signal; calculating a difference value between the second time and a corresponding first time; if the difference value is a positive value, increasing or decreasing a counted number by a set value, and accordingly, if the difference value is a negative value, decreasing or increasing the counted number by the set value; and within a set period of time, when the counted number is not increased or decreased, determining that a stepper motor is blocked.

Abstract: A valve device is provided. The valve device includes a valve body unit, a mounting seat and a valve seat. The valve device further includes a fastening member. The mounting seat is provided with a limiting step, and a side surface of the valve seat is provided with a connecting hole in communication with the mounting hole along a direction perpendicular to an axis of the mounting hole. And an end of the fastening member extends into the mounting hole from the connecting hole and abuts against the limiting step.

Abstract: Disclosed are a valve body connection structure and a valve assembly with the valve body connection structure. The valve body connection structure includes: a first connector including a first connection part and a first plug-in part, wherein the first connection part is fixedly connected to the main valve, and the first plug-in part is disposed on the first connection part; and a second connector including a second connection part, a second plug-in part and an extension part, wherein the second connection part is fixedly connected to the pilot valve, the second plug-in part is disposed on the second connection part, the first plug-in part matches the second plug-in part in an insertion manner, the extension part is disposed on the second connection part, and the extension part is provided with an assembly hole allowing a pipeline of the pilot valve to pass through.

Abstract: The present invention relates to the field of petroleum extraction equipment, and discloses a coiled tubing reel and a coiled tubing vehicle. The coiled tubing reel comprises a reel body assembly configured to wind a coiled tubing and a driving component configured to drive the reel body assembly, wherein, the reel body assembly comprises a reel body, a reel shaft, a transmission gear, and a first bearing block and a second bearing block that are oppositely arranged and spaced from each other, wherein the reel body is fixedly fitted on the reel shaft, the two ends of the reel shaft are rotatably arranged on the first bearing block and the second bearing block respectively, the transmission gear is fixed with respect to the reel shaft to drive the reel shaft to rotate, the driving component is fixedly arranged on the first bearing block and at least partially disposed inside the reel body, and the driving component comprises a driving gear that is engaged with the transmission gear.

Abstract: This invention relates to an asymmetric synthesis of sulfides via a chiral sulfoxide directed stereospecific reduction of ?,?-unsaturated sulfoxide to the saturated sulfide. These sulfides can be useful as selective estrogen receptor modulators or anti-neoplastic agents.

Abstract: The present invention relates to a periodic acid oxidation which converts the penultimate intermediate bearing a primary alcohol to the target endothelin antagonist compound of Formula I having a carboxylic acid.

Abstract: The present invention relates to an oxidation which converts a primary or secondary alcohol of Formula II: ##STR1## to an acid or ketone of Formula I: ##STR2## with periodic acid and a catalytic amount of a chromium reagent.

Abstract: The present invention relates to a TEMPO-catalyzed oxidation of primary alcohols, RCH.sub.2 OH to corresponding carboxylic acids, RCOOH in the presence of catalytic in the presence of catalytic amount of NaClO and stoichiometric amount of NaClO.sub.2 as an oxidant.

Abstract: This invention relates to a cyclization process useful in the preparation of a key intermediate in the preparation of an endothelin antagonist of the general formula shown below: ##STR1##

Abstract: The present invention relates to an oxidation using sodium chlorite in the presence of a catalytic amount of TEMPO and sodium hypochlorite which converts the penultimate intermediate bearing a primary alcohol to the target endothelin antagonist compound of Formula I having a carboxylic acid ##STR1##

Abstract: Imidazolmethyloxy-substituted tricyclo-macrolide immunosuppressants are prepared by reacting a tricyclo-macrolide with an imidazolmethyl trichloroacetimidate in the presence of an acid. The invention further provides a crystalline salt of imidazolmethyloxy-substituted tricyclo-macrolide, as well as novel compounds useful in the process of the present invention.

Abstract: The present invention is drawn to a process for forming an amide bond linkage comprising reacting a carboxylic acid and an amine in a two-phase mixture of water and an organic solvent selected from an oxygenated organic solvent or an aromatic solvent in the presence of a coupling reagent and an additive. This process is useful for making ubiquitous amides and polypeptides having various biological activities.

Abstract: The present invention is drawn to a process for forming an amide bond linkage comprising reacting a carboxylic acid and an amine in a two-phase mixture of water and an organic solvent selected from an oxygenated organic solvent or an aromatic solvent in the presence of a coupling reagent and an additive. This process is useful for making ubiquitous amides and polypeptides having various biological activities.

Abstract: An improved process is described which utilizes tetrachloro-1,4(or 1,2)-quinone as an oxidant in the Doebner-Miller synthesis of 7-chloroquinaldine, a starting material in the preparation of leukotriene antagonists. The process improves yield and eliminates the need of forming a ZnCl.sub.2 complex to isolate the end product.