33results about How to "Small switching torque" patented technology

The invention discloses a high-temperature gate valve of a combined wedge plate, which comprises external wedge plates, a valve seat, internal wedge plates, a steel ball, an associator, an elastic fixing mechanism, a wedge plate frame and a valve rod, wherein the fitting surface of the external wedge plate and the valve seat is a plane, and the fitting surface of the internal wedge plate and the external wedge plate is an inclined plane; the upper part of the internal wedge plate is provided with a transverse through-hole, and two internal wedge plates are positioned by the steel ball; the associator passes through the transverse through-hole of the two internal wedge plates so as to connect the two internal wedge plates together, and a vertical axial threaded hole connected with the valve rod is arranged on the associator; a pair of wedge plates is composed of the external wedge plates and the internal wedge plates, and is fixed on the wedge plate frame with aid of the elastic fixing mechanism. The high-temperature gate valve of a combined wedge plate of the invention has the advantages of reducing the torque of a valve switch, and prolonging the service life of the valve.

The invention discloses a method for spraying a wolfram carbide alloy on a seal surface of a valve plate (seat) at a supersonic speed. The method is characterized in that supersonic spraying equipment is adopted to spray the wolfram carbide alloy on the seal surface of the valve plate (seat); the sprayed wolfram carbide alloy coating is dense and meets the airtightness requirement; the coating hardness HV (Vickers hardness) is not less than 1100; the coating void ratio is not more than 1%; the coating bonding strength is not less than 10000PSi; and the coating thickness is more than 0.15mm. The method has the following advantages: through supersonic spraying, the coating and a matrix structure are not subjected to high temperature and deformation; preheating and postweld heat treatment are not needed; lathing is not needed after welding; the method is suitable for batch (non-singleton) production; and the production efficiency is high.

The invention relates to corrosion-resistant valve application technology, in particular to a ceramic composite-coating type corrosion-resistant valve and a paint coating process of a ceramic composite coating in the corrosion-resistant valve. The ceramic composite-coating type corrosion-resistant valve is made of a ceramic material resistant to abrasion and corrosion, and valve parts are coated with the ceramic composite coating, so that technical content is high, corrosion resistance is good, and friction coefficient is low; a sealing pair is composed of the coating and a plastic material, so that the ceramic composite-coating type corrosion-resistant valve has the advantages of being low in force of friction, small in switch moment, long in service life and the like; besides, application of the valve in the field of fluid resistant to corrosion is enlarged, corrosion-resistant alloy steel can be replaced in use, and obvious social benefits are achieved.

The invention discloses an under-pressure low-torque square drill rod plug valve, and belongs to the technical field of drilling equipment. The plug valve comprises a valve body, a lower valve seat, a valve core and an upper valve seat, wherein the lower valve seat, the upper valve seat and the valve core are assembled in the valve body in a matched way, the upper part of the valve core is provided with a valve rod penetrating through the valve body in a matched way, a first sealing ring is arranged between assembling surfaces of the lower valve seat and the valve body, and the first sealing ring is a lip-shaped sealing ring. The under-pressure low-torque square drill rod plug valve has the advantages that the structure is simple, and the use is convenient. The problems that the opening difficulty of the traditional square drill rod plug valve is great at high pressure, the drilling operation is influenced and the like are solved. Through the improvement via the technical scheme, the opening and closing moment of the plug valve is greatly reduced, so that the opening of the plug valve at the high pressure becomes possible, in addition, the low-torque plug valve capable of being opened by a single person at the pressure difference being 70MPa can be realized, and the market and production site requirements are well met.

The invention provides a combined valve. The combined valve can be free of leakage for a long time under severe working conditions. The combined valve comprises a combined valve body, wherein a medium inlet and a ball valve cavity communicated with the medium inlet are formed in one side of the combined valve body, a medium outlet and a stop valve cavity communicated with the medium outlet are formed in the other side of the combined valve body, the ball valve cavity is communicated with the stop valve cavity, a stop valve element arranged in the stop valve cavity a is connected with stop valve rod, a handle is connected to one end of the stop valve rod, a ball valve ball body arranged in the ball valve cavity is connected with a ball valve rod, the ball valve rod is connected with an output shaft at one end of a speed reduction mechanism, the other end of the speed reduction mechanism is connected with a driving gear for driving the speed reduction mechanism to rotate, the driving gear is meshed with a transition gear, and the stop valve rod drives the transition gear to rotate. The combined valve is integrally designed, has few leakage points, and is more reliable in pipeline installation, and more convenient to operate.

The invention relates to a valve, in particular to an eccentric cam flow regulation control valve. A valve core is arranged in a valve cavity of a valve body (1), two ends of the valve core are supported on the valve body through a bearing (6), a bearing seat (4) and a bearing seat (5), and the valve core is composed of a core shaft (9) and a cam (3). The eccentric cam flow regulation control valve is characterized in that the valve core and the valve cavity are arranged in an eccentric mode, a sealing inner liner (2) is arranged on the inner wall of the valve cavity, and a filtering hole for enabling medium to penetrate is formed in the sealing inner liner (2). One end of the core shaft (9) is built-in, and the other end of the core shaft (9) is external. A hexagonal or quadrilateral shaft head (11) capable of being adjusted by a wrench is arranged on the external end of the core shaft (9), and a flow regulation locating plate (10) capable of locating the rotary motion of the core shaft (9) in the circumferential direction is arranged on a bearing seat cover (7) of the external end of the core shaft (9). The eccentric cam flow regulation control valve had the advantages of being small in opening torque, stable and adjustable in medium flow, simple in whole structure and long in service life.

The invention discloses a processing method of an eccentric sphere embedded plastic ball valve and a product thereof. The eccentric sphere embedded plastic ball valve comprises an eccentric sphere, a valve body and a driving mechanism and the invention provides a processing method thereof, wherein the driving mechanism drives the sphere to rotate. The eccentric sphere of the valve and the valve seat can be embedded in a die, and the valve body are integrally cast and shaped. The integral strength of the valve manufactured by the invention is higher than that of the valve body manufactured by the prior art, and the valve body stress is evenly distributed to lighten creep generated by stress concentration so as to greatly improve the durability of the ball valve. The ball valve has good sealing property, is easy to switch on and off, has accurate position, reduces processing steps, saves consumables and has obvious quality meaning and economic benefit.

The invention discloses a six-way switching ball valve, and belongs to switching valves. The ball valve solves the problem that an inlet and an outlet of an existing six-way switching valve are located on the same side, and consequently an application occasion is limited. The six-way switching ball valve is composed of an upper three-way ball valve, a lower three-way ball valve and a driving conversion mechanism; the structure and component parts of the upper three-way ball valve and the structure and component parts of the lower three-way ball valve are completely the same; each of the upper three-way ball valve and the lower three-way ball valve is composed of a valve body, a ball body, a sealing gasket ring, a sealing check ring, a rotating shaft, a thrust ring, a flange gland, a rotating check block and a steel wire check ring; the driving conversion mechanism comprises a handle, a conical gear, a gearbox, an input shaft, a ball bearing, an upper output shaft and a lower output shaft; the upper output shaft and the lower output shaft of the driving conversion mechanism are connected with the rotating shaft of the upper three-way ball valve and the rotating shaft of the lower three-way ball valve respectively in a matched mode. The six-way switching ball valve is simple in structure and small in switching torque; an inlet and an outlet of the six-way switching ball valve are arranged on the different sides; the problem that the inlet and the outlet are arranged on the same side, and the application occasion is limited is solved; and when the driving conversion mechanism is replaced by a sleeve, the valve can adapt to the occasion in which the oil inlet and the oil outlet are arranged on the same side, the interchangeability is high, and field pipelines are more flexibly arranged.

The invention relates to the technical field of valves, in particular to an eccentric semi-ball valve comprising a hollow valve body and a semi-ball valve element installed in the valve body through avalve rod and capable of rotating. The semi-ball valve element and a valve base installed in the hollow valve body are connected in a sealed manner A transmission mechanism used for conducting rotation and making the valve rod rise and fall is installed at the upper end of the valve rod. An installation groove used for installing the semi-ball valve element is formed in the lower end of the valvebody. A supporting rod arranged in the installation groove in an embedded manner is arranged at the lower end of the semi-ball valve element. A radial inwards-shrinking groove is formed in the end, close to the semi-ball valve element, on the supporting rod. A straight part with the square section and an inclined part are arranged at the lower end of the valve rod. The inclined part is arranged at the upper end of the straight part and inclines towards the valve base. The straight part is arranged at the upper end of the semi-ball valve element in a penetrating manner. The eccentric semi-ballvalve solves the problem that the sealing face of an existing eccentric semi-ball valve is likely to be abraded.

The invention discloses a ball screw gate valve convenient to open and close. The ball screw gate valve comprises a valve body. A channel, a valve seat and a valve plate are arranged in the valve body. An upper valve cover is arranged at the upper end of the valve body, a lower valve cover is arranged at the lower end of the valve body, and a grease injection valve is respectively arranged on the upper valve cover and the lower valve cover. A base is arranged at the lower end of the lower valve cover, a tail rod is connected with the lower end of the valve plate, a tail rod base is arranged at the lower end of the tail rod, and the tail rod base is arranged in the base. A support is arranged at the upper end of the upper valve cover, a packing gland is arranged between the support and the upper valve cover, and a ball screw pair is arranged in the support. A hand wheel rod is arranged at the upper end of the ball screw pair, the upper end of the hand wheel rod is connected with a hand wheel, a ball screw base is arranged at the lower end of the ball screw pair, a bearing support is arranged in the support between the ball screw base and the packing gland, the lower end of the ball screw base is connected with the lower end of a valve rod, and the lower end of the valve rod is connected with the valve plate.

The invention discloses a cast three-piece symmetrical floating-ball elastic-seal duplex switchable filter in the field of industrial pipeline medium circulation and filtration. According to the switchable filter, three-piece type connection is adopted in a case, so that a control chamber and two filtration chambers are formed. An upper rotating shaft, a lower rotating shaft, an upper three-way ball, a lower three-way ball and a plurality of elastic seal pair combinations are arranged in the control chamber, wherein the elastic seal pair combinations ensure the seal connection between the upper three-way ball and the lower three-way ball and inlets or outlets of the filtration chambers. According to the switchable filter, the technical problems that the assembly sealing property of an existing integrally-cast case and a two-piece cast connection type case is poor, switching torque of a handle is large and switching is difficult are solved. As the upper three-way ball and the lower three-way ball in the structure are matched with elastic seal pairs composed of seal rings and elastic seal rings of the corresponding structural design, the compression amount can be measured, and the elasticity can be controlled. Moreover, a certain pre-tightening force is possessed under low pressure after a main case and an auxiliary case are combined, the sealing property is good, and the torque for switching the handle is small when the switchable filter works under the environment of high-pressure media.

The invention discloses an embedded sealing and isolating sealed casing head, comprising a base assembly, a slips hanger, two rubber seal rings, two grease injection valves, two flat gate valves, a pressure gauge stop valve assembly, a pressure gauge, a metal sealed hanger, a casing head body, two threaded flanges, a pipe plug joint, two drain plugs, an oil-string casing, and an intermediate casing. The casing head is advantaged by low switching moment. A balancing pole on the tail of a valve can make operation of the valve portable and flexible in high-pressure load, and integrated sealing property of the casing head is ensured. All sealing backing rings and hanger sealing components use metal sealing, and the annular space of the casing is preferably sealed, and changing fittings is more convenient and easy.

The invention discloses hinges for a hinge blowout preventer. Each hinge is formed by connecting a cuboid section with a cylindrical section, wherein a hydraulic oil opening inlet, a hydraulic oil closing inlet, a first channel communicated with the hydraulic oil opening inlet and a second channel communicated with the hydraulic oil closing inlet are formed in the cuboid section of each hinge; a hinge shaft hole is formed in the center of the cylindrical section of each hinge; the end of each first channel and the end of the corresponding second channel are communicated with the corresponding hinge shaft hole; a lubrication oil through hole is formed in one side of each hinge shaft hole, and the hinge shaft hole and the corresponding lubrication oil through hole penetrate through the upper end surface and the lower end surface of the corresponding cylindrical section; annular grooves communicated with each lubrication oil through hole are formed in the upper end surface and the lower end surface of the corresponding cylindrical section. The hinges have the advantages that the structure is reasonable; machining and mounting are convenient; the opening and closing resistance of the hinges is small, and the hinges cannot rust after being used for a long time; with the adoption of the external lubrication oil channels, operation is convenient, comprehensive lubrication is realized, and opening and closing torque of a side door can be reduced. The hinges are universal, so that difference among oil circuits cannot be caused, a worker can perform mounting operation conveniently, and the mounting time is reduced.

The invention relates to an ultra-low temperature plate valve which comprises a valve body, a lengthened valve cap, a valve rod, a valve plate, a valve base, a bracket, a handwheel and a direction rod, wherein a cavity channel serving as a medium flow passage is formed coaxially and horizontally inside the valve body; the lengthened valve cap is fixedly mounted at the vertical upper end of the valve body coaxially; the valve rod is mounted in the middle of the valve body vertically; the valve plate is coaxially and fixedly mounted at the lower end of the valve rod inside the valve body; the handwheel is coaxially mounted on the valve rod of which the upper end extends out of the upper end of the lengthened valve cap; compression springs are mounted the on the contact surface of the outer circumference of the valve seat and the valve body; a low-temperature-resistant energy-storage seal ring is mounted on the convex shoulder contact surface between the valve seat and the valve body. The ultra-low temperature plate valve solves the technical problems of sealing and heavy on / off torque under the condition of ultra-low temperature and high-pressure medium; the plate valve is scientific in design, simple in structure, high in working pressure, reliable in sealing property, light in on / off torque, and long in service life, so as to be widely applied to various working conditions of ultra-high pressure and ultra-low temperature.

The invention provides a non-rising stem flat gate valve. The non-rising stem flat gate valve comprises a valve body, a valve seat, a valve deck, a packing gland, a support and an oil cup. The valve body is connected with the valve seat, a wave spring is arranged between the valve body and the valve seat, the valve deck is located above the valve body, and the packing gland is located above the valve deck; the packing gland is connected with the support through a screw, a valve rod is arranged in the center of the valve body, a bearing is arranged above the oil cup, and the oil cup makes contact with the valve rod in the mode that a pin penetrates through the support; a hand wheel is arranged above the packing gland, and a start and stop notice board is arranged on the hand wheel. A gate segment and the valve seat are treated through a special process and subjected to spray welding of hard alloy, sealing faces are free of friction, and the service life is long. Grease can be injected for auxiliary sealing dual protection, sealing is reliable, and the service life of the valve is longer. Compared with a traditional gate valve, the flat gate valve has the advantages of being small in switching torque, flexible in start and stop and the like.

The invention discloses a full lining bidirectional composite soft sealing butterfly valve, belonging to the butterfly valves for pipelines of a large-scale water supply and drainage engineering, sea water and wastewater treatment, fresh water, gases and the like. The full lining bidirectional composite soft sealing butterfly valve comprises a valve body, a valve seat, valve shafts, a valve plate, a connecting seat, a pressing cover, bushes, a seal ring and a rear end cover, wherein the valve seat is arranged on the valve body; the valve shafts are arranged on the central line of the valve body; the valve plate is connected with the valve shaft; the connecting seat, the pressing cover, the bush and the seal ring are mounted on the upper part of the valve body; and the rear end cover is arranged at the bottom of the valve body. The full lining bidirectional composite soft sealing butterfly valve is characterized in that the valve shaft is formed by connection of an upper valve shaft (4) and a lower valve shaft (9); the valve seat (3) adopts a composite off-center inclined plane sealing form to be directly vulcanized on the valve body (1) and fully cover the valve body (1); the valve plate (2) is an inclined plate sphere; the upper and lower supports of the valve body (1) are sealed through an O-shaped seal ring (8); and the bushes (7) are respectively installed in the upper and lower supports of the valve body (1). The invention has the advantages of corrosion resistance, long service life and good sealing property while avoiding lock or setover of closure.

The invention relates to an ultra-low temperature plate valve which comprises a valve body, a lengthened valve cap, a valve rod, a valve plate, a valve base, a bracket, a handwheel and a direction rod, wherein a cavity channel serving as a medium flow passage is formed coaxially and horizontally inside the valve body; the lengthened valve cap is fixedly mounted at the vertical upper end of the valve body coaxially; the valve rod is mounted in the middle of the valve body vertically; the valve plate is coaxially and fixedly mounted at the lower end of the valve rod inside the valve body; the handwheel is coaxially mounted on the valve rod of which the upper end extends out of the upper end of the lengthened valve cap; compression springs are mounted the on the contact surface of the outer circumference of the valve seat and the valve body; a low-temperature-resistant energy-storage seal ring is mounted on the convex shoulder contact surface between the valve seat and the valve body. The ultra-low temperature plate valve solves the technical problems of sealing and heavy on / off torque under the condition of ultra-low temperature and high-pressure medium; the plate valve is scientific in design, simple in structure, high in working pressure, reliable in sealing property, light in on / off torque, and long in service life, so as to be widely applied to various working conditions of ultra-high pressure and ultra-low temperature.

The invention discloses an eccentric butterfly valve comprising a valve rod, a butterfly plate and a valve body, wherein the valve rod is installed on the valve body through a channel of the valve body, and provided with the butterfly plate; the bottom of the valve rod is provided with a water pilot bearing, and the middle part of the valve rod is provided with the butterfly plate arranged in the channel and comprising a mounting hole and a convex; the mounting hole arranged on the butterfly plate is installed on the valve rod, and the axis of the mounting hole, the vertical center line of the butterfly plate convex and the center line of the valve channel are non-intersect; the convex is circular, and the sealing surface of the convex is cambered in a top view. The invention technically aims to provide an eccentric butterfly valve with the advantages of high reliability, small torque for opening and closing the valve, reliable sealing and long service life of a seal.

The invention discloses a full-lining bidirectional composite soft sealing butterfly valve, which belongs to a butterfly valve for a pipeline of fresh water, gas and the like in large water supply and drainage engineering and seawater and sewage treatment. The butterfly valve comprises a valve body, a valve seat arranged on the valve body, a valve plate rotating around a valve shaft, a valve shaft connected with the valve plate, a connection seat, a gland, a bushing, a seal ring and a rear end cover arranged on the bottom part of the valve body, wherein the connection seat, the gland, the bushing and the seal ring are arranged on the upper part of the valve body, thevalve shaft is connected with the valve plate by an upper valve shaft (4) and a lower valve shaft (9) through a square or flat head; the valve plate (2) is an inclined plate spherical surface; the valve seat (3) is directly vulcanized on the valve body (1) in a composite eccentric bevel sealing mode and completely covers the valve body (1); the upper and lower supports of the valve body (1) are sealed by an O-shaped seal ring (8); the O-shaped seal ring (8) is compacted by a packing gland (6) and the bushing (7); and the bushing (7) is installed in the upper and lower supports of the valve body (1). The invention has the advantages of capability of avoiding locking or over-closing, corrosion resistance, long service life, high sealing performance and the like.

The invention discloses an off-circuit tap-changer with an in-place operation hand feeling. The off-circuit tap-changer is characterized by comprising a main shaft arranged on an upper supporting seatand a lower supporting seat in a penetrating manner; one end of the main shaft is connected with an intermittent motion mechanism, the output end of the intermittent motion mechanism is connected with a moving contact support, the moving contact support is provided with a wedge-shaped moving contact assembly which is in sliding connection with the moving contact support in the radial direction, the circumference of the moving contact assembly is correspondingly provided with a static contact column matched with the moving contact assembly, and the main shaft is further provided with a double-roller cam mechanism matched with a moving contact supporting piece. The intermittent motion mechanism is combined with the double-roller cam mechanism, each cam is matched with at least two rollers,so that the switch has in-place hand feeling and in-place sound, the vibration hand feeling can overcome membrane resistance caused by contact between the moving contact and the static contact, and the reliability of the switch is further improved.

This invention provides a dual-sealing valve, which is used under the condition that the controlled liquid is flowed in double-way, and can realize opening function under less opening power. The dual-sealing valve includes valve body with in-outlet, and two sealing elements disposed in a valve cavity which is in the valve body and matched with the inlet and the outlet. A linkage synchronization unit is disposed between the two sealing elements, and a pressure relieving device is connected between the valve cavity and the in-outlet. The valve reduces not only the opening-closing moment greatly, but also the volume of the outside operation device and the requirement of the power source, thus the operation speed of the valve and the service life of the valve are improved. Moreover, the valve has realized self-dual-sealing in double-way, and achieved no damage rapid switch by the linkage synchronization unit. Thus the reliability of the inside operation of the valve is improved, and the cost of the valve is reduced. This invention applies especially in the environment of large flux and high pressure, which requires good sealing performance, intrinsically safe, and frequently rapid switch.

The invention discloses a cast three-piece symmetrical floating-ball elastic-seal duplex switchable filter in the field of industrial pipeline medium circulation and filtration. According to the switchable filter, three-piece type connection is adopted in a case, so that a control chamber and two filtration chambers are formed. An upper rotating shaft, a lower rotating shaft, an upper three-way ball, a lower three-way ball and a plurality of elastic seal pair combinations are arranged in the control chamber, wherein the elastic seal pair combinations ensure the seal connection between the upper three-way ball and the lower three-way ball and inlets or outlets of the filtration chambers. According to the switchable filter, the technical problems that the assembly sealing property of an existing integrally-cast case and a two-piece cast connection type case is poor, switching torque of a handle is large and switching is difficult are solved. As the upper three-way ball and the lower three-way ball in the structure are matched with elastic seal pairs composed of seal rings and elastic seal rings of the corresponding structural design, the compression amount can be measured, and the elasticity can be controlled. Moreover, a certain pre-tightening force is possessed under low pressure after a main case and an auxiliary case are combined, the sealing property is good, and the torque for switching the handle is small when the switchable filter works under the environment of high-pressure media.

The invention discloses an anti-oil-leakage valve used for a power transformer oil tank. The anti-oil-leakage valve mainly comprises an upper valve rod, a butterfly plate and a lower valve rod, wherein the upper valve rod, the butterfly plate and the lower valve rod are sequentially connected. Flexible adjustment rings are fixed to the inner side of the upper end surface of the butterfly plate and the inner side of the lower end surface of the butterfly plate respectively, the upper valve rod is sleeved with an upper adjustment bearing, the lower valve rod is sleeved with a lower adjustment bearing, the upper adjustment bearing is sleeved with an upper adjustment ring, the lower adjustment bearing is sleeved with a lower adjustment ring and an inner tightening ring from inside to outside in sequence, the lower portion of the inner tightening ring is connected with a valve body through a bolt, and the valve body is sleeved with the upper adjustment ring. According to the anti-oil-leakage valve used for the power transformer oil tank, because the upper adjustment bearing and the lower adjustment bearing are adopted, friction resistance applied to the valve rods can be reduced, sealing conditions of the upper and lower end surfaces of the butterfly plate can be easily changed, and the sealing performance of the valve is improved. An O-shaped ring is installed in the inner tightening ring in the form of a groove, and therefore the opening or closing torque of the valve can be reduced; because the flexible adjustment rings and rigid adjustment rings are arranged on the upper end surface of the butterfly plate as well as the lower end surface of the butterfly plate, the opening or closing torque can be reduced, deformation is avoided, and a good oil leakage preventing effect is achieved.

The invention discloses a lip-shaped sealing ring and a plug valve thereof and belongs to the technical field of drilling devices. The lip-shaped sealing ring comprises an annular sealing ring body. The lips of the lip-shaped sealing ring are located on the two side faces of the sealing ring body, and a lip opening facing the external diameter of the sealing body is formed between the two lips; the plug valve comprises a lower valve seat, an upper valve seat, a valve core and a valve rod which are assembled in a valve body in a matched mode, a first sealing piece is arranged between the lower valve seat and the valve body, and a second sealing piece is arranged between the valve rod and the valve body; and a third sealing piece is arranged between the upper valve seat and the valve body, and the first sealing piece is the lip-shaped sealing ring and arranged between the end surface of the lower valve seat and the end surface of the valve body. According to the lip-shaped sealing ring, sealing between panels can be achieved, the plug valve is simple in structure, and the problem that drilling operation is influenced by the condition that a traditional square drilling rod plug valve is large in opening difficulty under the high pressure is solved, a low-torque plug valve opened through a single person under the 70 MPa differential pressure can be achieved, and the requirements for markets and production sites are well met.

The invention discloses a novel butterfly valve, which comprises: a disc plate, a valve body and a valve stem. The valve stem passes through the top of the valve body and is vertically installed in the valve body. A water guiding bearing is arranged between the lower part of the valve stem and the valve body. A disc plate is installed in the middle of the valve stem. The disc plate is set in the flow channel. The disc plate includes a mounting cylinder and a convex body. The convex body is mounted on the mounting cylinder. The valve stem passes through the mounting cylinder, and the mounting cylinder is fixed on the valve stem. Above; the center line of the installation cylinder, the vertical center line of the convex body of the disc plate and the center line of the valve flow channel do not intersect, the valve seat is installed in the valve body, and the convex body and the valve seat are installed together to form a sealing surface; the inlet end of the valve body A sight glass is installed on the top. The technical purpose of the present invention is to provide a new type of butterfly valve with sight glass, higher reliability, smaller opening and closing torque, and more reliable sealing. Flow conditions, and can reduce the process of installing the mirror.

The invention discloses a processing method of an eccentric sphere embedded plastic ball valve and a product thereof. The eccentric sphere embedded plastic ball valve comprises an eccentric sphere, a valve body and a driving mechanism and the invention provides a processing method thereof, wherein the driving mechanism drives the sphere to rotate. The eccentric sphere of the valve and the valve seat can be embedded in a die, and the valve body are integrally cast and shaped. The integral strength of the valve manufactured by the invention is higher than that of the valve body manufactured by the prior art, and the valve body stress is evenly distributed to lighten creep generated by stress concentration so as to greatly improve the durability of the ball valve. The ball valve has good sealing property, is easy to switch on and off, has accurate position, reduces processing steps, saves consumables and has obvious quality meaning and economic benefit.

A six-way switching ball valve belongs to the switching valve, which solves the problem that the inlet and outlet of the existing six-way switching valve are all arranged on the same side, resulting in limited application occasions. The present invention consists of an upper three-way ball valve, a lower three-way ball valve and a drive conversion mechanism. The structure and components of the upper three-way ball valve and the lower three-way ball valve are exactly the same. Rotary shaft, thrust ring, flange gland, rotating block, steel wire retaining ring; the drive conversion mechanism includes handle, bevel gear, gearbox, input shaft, ball bearing, upper output shaft, lower output shaft, drive conversion The upper and lower output shafts of the mechanism are matched and connected with the rotating shafts of the upper and lower three-way ball valves respectively. The invention has the advantages of simple structure, small switching torque, different side arrangement of the inlet and outlet, and solves the problem of limited application occasions of the arrangement of the same side of the inlet and outlet. Strong performance, making the on-site pipeline layout more flexible.

The invention discloses a PDS ball valve comprising a valve body, a ball core and a valve seat. The valve seat is elastically and tightly pressed to the spherical face of the ball core. A guide component is arranged at the back end of the valve seat and located on the side far away from the ball core, wherein the guide component exerts pretightening force on the valve seat to tightly press the valve seat to the spherical face of the ball core. The guide component provides initial pretightening force for the valve seat and transmits medium pressure to the valve seat. The PDS ball valve can be used for preventing solid particles in the medium from entering a spring cavity, and the medium pressure does not compress the spring in the use process; and meanwhile, the pressure bearing area at thetail end of the valve seat is reduced, so that the push force for the valve seat to be tightly pressed to the spherical surface of the ball core is reduced, the friction force between the valve seatand the spherical surface of the ball core is reduced, the seal performance of the valve is guaranteed, the opening and closing torque of the valve is reduced, and the service life of the valve is prolonged.

The invention discloses an off-circuit tap-changer of a wedge-shaped contact structure. The off-circuit tap-changer comprises an upper supporting seat and a lower supporting seat, a main shaft penetrates between the upper supporting seat and the lower supporting seat; one end of the main shaft is connected with the operating mechanism; the main shaft is connected with a gear mechanism; the outputend of the gear mechanism is connected with a grooved wheel mechanism; the grooved wheel of the grooved wheel mechanism is hollowly sleeved on the main shaft, and is connected with the moving contact;the moving contact support is provided with moving contact assemblies which are slidably connected with the moving contact support; and static contact columns configured with the moving contact assemblies are correspondingly arranged at the circumference of the moving contact assemblies. The off-circuit tap-changer of the wedge-shaped contact structure is characterized in that: a crank is arranged on the main shaft, the crank is connected with the moving contact support pieces of the moving contact assemblies through the connecting rod of the crank mechanism, so that the moving contact assemblies can intermittently rotate along with the grooved wheel mechanism and can also slide and stretch along with the crank mechanism in the radial direction. During gear shifting, the moving contact does not rub with the static contact columns, so that the gear shifting torque of the switch is small, a plating layer of the contact is protected from being damaged, and transformer oil is prevented from being polluted by metal powder generated by contact friction.