58results about How to "Adjust the amount of compression" patented technology

The invention discloses a self-stabilization single-face thin film restrictor with a prepressure adjusting function. The problem of adjusting prepressure of the single-face thin film restrictor and the problem that prepressure cannot adapt to the working condition are solved, the effect of adjusting prepressure of the restrictor is achieved, and therefore the restrictor is capable of meeting the application requirement of working condition changes. Prepressure fluctuation can be automatically stabilized to stably control the throttling gap and realize the ideal throttling ratio. According to the technical scheme, the self-stabilization single-face thin film restrictor comprises an upper valve body and a lower valve body, an elastic thin film is arranged between the upper valve body and the lower valve body, a prepressure cavity is formed between the bottom of the upper valve body and the elastic thin film and communicated with a throttling conical hole, an adjusting stud is arranged in the throttling conical hole, an upper oil outlet hole is formed in the adjusting stud, and a throttling conical valve is arranged in the upper oil outlet hole through an elastic element in a supported mode; a throttling cavity is formed between the bottom of the lower valve body and the elastic thin film, a throttling table is arranged at the top of the lower valve body, and the throttling cavity is communicated with a lower oil outlet hole through a throttling gap between the throttling table and the elastic thin film.

The invention relates to a bearing constant-pressure pretightening device and a selective assembly method thereof, wherein the bearing constant-pressure pretightening device comprises a first bearing, a second bearing and a preloading component; the first bearing is fixedly arranged; the second bearing is available for adjusting axial adjustment activities; the preloading component abuts against a free end of the second bearing; the preloading component is a compressible elastic component; and the first bearing and the second bearing are an angular contact ball bearings respectively. With the adoption of the bearing constant-pressure pretightening device provided by the invention, the free end of an outer ring of the second bearing abuts against the compressible preloading component; the preloading component enables the first bearing and the second bearing to be always kept without load direction change during the process of loading work loads F; therefore, the phenomena of light load slip or severe abrasion and the like frequently occurring to the bearings during the process of unloading the loads with direction change are prevented; in addition, the preloading component can adjust the compression amount of an elastic gasket conveniently and fast through the arrangement of adjusting washergaskets of different numbers, so that the required bearing pretightening is obtained; and the free end of the second bearing is adjustable along the axial direction, so that the affection of temperature on the bearing preload can be automatically eliminated.

A double-eccentric ultralow temperature butterfly valve comprises a valve body, a valve rod and a butterfly plate. The double-eccentric ultralow temperature butterfly valve is characterized in that a manhole is formed in the valve body, and an upper maintenance cover is arranged at the position of the manhole; a sealing component composed of a sealing ring, a pressing ring and a jacking and pressing component is included; the inner side face of the sealing ring is sealed with the butterfly plate, the jacking and pressing component comprises a locking ring, a plurality of jacking and pressing screws arranged on the locking ring and locking nuts connected with the jacking and pressing screws, the end portions of the jacking and pressing screws are pressed on the outer end face of the pressing ring, a circular bead face is arranged at the end, away from the pressing ring, of the locking ring, and a compression ring compressed on the circular bead face is inserted in the inner cavity wall of the valve body. Through the structure, the sealing ring is convenient to replace online, and the online maintenance of the valve body is more convenient and faster. In the maintenance process, only the upper maintenance cover needs to be opened, and the sealing component is dismounted one by one. In addition, the position of the pressing ring is controlled by adjusting the jacking and pressing screws, the compression amount of the sealing ring can be adjusted, and therefore the sealing performance of the valve is guaranteed, and the safe reliability of the valve is improved.