161 results about "Valve guide" patented technology

The utility model discloses a valve guide pipe feeding device. The valve guide pipe feeding device comprises a feeding mechanism, a distributing mechanism arranged on a rack and a feeding mechanism arranged on the rack. The feeding mechanism comprises a feeding support, a box body is arranged on the feeding support, a door is arranged on the side portion of the box body, and a box cover is arranged on the top of the box body. A bottom plate is obliquely arranged at the bottom of the box body, and the height of the first end of the bottom plate is smaller than that of the second end of the bottom plate; the box body is located at the first end of the bottom plate, a box body opening is formed in the end of the box body, a material receiving assembly is arranged at the position of the box body opening, and a material supply power piece is further arranged on the material supply support and used for conveying the valve guide pipes falling into the material receiving assembly to a press fitting station. According to the valve guide pipe feeding device, the feeding efficiency of valve guide pipes can be improved, the labor intensity of operators is reduced, the production cost is reduced, and the economic benefits of enterprises are improved.

A fluid end made of a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section is made of a housing having a discharge bore and an intake bore formed therein. A fluid routing plug is installed within each housing and is configured to route fluid throughout the housing and between the discharge and intake bores. The fluid routing plug carries seals that engage sealing surfaces formed within the housing. A number of features, including the location of seals within bore walls and carbide inserts within valve guides, aid in reducing or transferring wear within each housing.

The invention discloses a dual-fuel diesel engine cylinder cover disassembling and assembling platform in the technical field of diesel engine cylinder cover assembling, which is used for disassembling and assembling an air valve guide pipe on a cylinder cover main body and comprises a working table, a clamping mechanism arranged on the working table and used for clamping the cylinder cover main body, and a bearing frame arranged on the working table, the disassembly and assembly driving mechanism and the disassembly and assembly auxiliary mechanism are arranged on the bearing frame. The dismounting and mounting driving mechanism is arranged to dismount the air valve guide pipe on the air cylinder cover, and when the dismounting and mounting driving mechanism cannot drive the air valve guide pipe to move upwards to be separated from the mounting hole in the air cylinder cover body, the heating ring makes contact with the mounting hole area in the air cylinder cover body to heat the mounting hole area; the mounting hole area is uniformly heated and expanded through heat conduction, friction force is reduced through heat expansion difference, the stuck old air valve guide pipe is assisted to be smoothly disassembled, the damage risk of the air valve guide pipe and the mounting hole is greatly reduced, and meanwhile the assembling precision and the sealing performance of the new air valve guide pipe are guaranteed.

The invention relates to the technical field of unloading valves, in particular to a high-flow unloading valve structure based on pilot self-adaptive control, which comprises a main valve body, two main valve seats are arranged at the top of the interior of the main valve body, main valve cores are arranged on the two main valve seats, two one-way valve guide sleeves are arranged at the bottom of the interior of the main valve body, and two one-way valve guide sleeves are arranged at the bottom of the interior of the main valve body. The two one-way valve guide sleeves are each provided with a one-way valve element, and the one-way valve elements are arranged below the main valve element. The mechanical pilot valve is arranged at one end of the main valve body; and the electromagnetic pilot valve is arranged at the top of one side of the mechanical pilot valve. Compared with the prior art, through mutual cooperation of the four liquid paths, long-term stable operation of the system is ensured, overload is prevented, energy consumption is reduced, the service life of equipment is prolonged, then the response speed, stability and control precision of the system are improved, and the efficiency and reliability of the hydraulic system are effectively improved.

The thin-wall bearing ring end face defect detection device comprises a double-face detection machine body, a servo motor is arranged at the top of the double-face detection machine body, a contact face detection disc connected with the servo motor in a transmission mode is arranged on the inner wall of the double-face detection machine body, and multiple sets of movable adjusting columns are arranged at the bottom of the contact face detection disc in a penetrating mode; the pressurizing spray valve guides inclined airflow to continuously and pneumatically clean the thin-wall bearing sleeve passing through a rotating brush carrier area, so that residual impurities can be effectively removed and prevented from being retained on the end face of the bearing sleeve, and meanwhile, the impurities generated after cleaning of the rotating brush carrier are prevented from flying to a detection area due to inertia; in this way, a clean environment is created for subsequent detection links, the detection precision is greatly improved, interference of impurities on detection results is reduced, the accuracy and reliability of detection work of the thin-wall bearing sleeve are guaranteed, and product quality control is assisted.

The utility model discloses a press fitting device used for press fitting of a valve guide pipe, the press fitting device used for press fitting of the valve guide pipe comprises a press fitting mechanism arranged on a machine frame, the press fitting mechanism comprises a press fitting power piece which is vertically arranged, the fixed end of the press fitting power piece is installed on the machine frame, and the action end of the press fitting power piece is fixedly connected with a pressing head seat. Four pressing heads are arranged on the pressing head seat, and four screw screws are arranged on each pressing head in the circumferential direction. By using the press-fitting device for press-fitting the valve guide pipe, the press-fitting efficiency can be improved, the labor intensity of operators can be reduced, the production cost can be reduced, and the economic benefits of enterprises can be improved.

A fluid end made of a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section is made of a housing having a discharge bore and an intake bore formed therein. A fluid routing plug is installed within each housing and is configured to route fluid throughout the housing and between the discharge and intake bores. The fluid routing plug carries seals that engage sealing surfaces formed within the housing. A number of features, including the location of seals within bore walls and carbide inserts within valve guides, aid in reducing or transferring wear within each housing.

The utility model discloses a valve guide pipe feeding mechanism which comprises a feeding support, the feeding support comprises a horizontal plate, two through holes are vertically formed in the horizontal plate, a material pushing part is arranged below the horizontal plate in a sliding mode, and two material pushing part cavities are formed in the material pushing part. A guide seat is arranged below the material pushing part, and four guide seat cavities are formed in the guide seat; the feeding mechanism further comprises a material pushing power piece, the action end of the material pushing power piece is fixedly connected with the material pushing piece, and the material pushing piece horizontally reciprocates under the action of the material pushing power piece. A baffle plate is horizontally arranged on one side of the upper end part of the material pushing part; the feeding mechanism further comprises a feeding seat, four feeding seat grooves are formed in the feeding seat, and the feeding seat grooves are used for receiving the valve guide pipes falling off from the guide seats. According to the feeding mechanism of the valve guide pipe, the feeding efficiency of the valve guide pipe can be improved, the labor intensity of operators is reduced, the production cost is reduced, and the economic benefits of enterprises are improved.

The utility model discloses a valve guide pipe feeding mechanism which comprises a feeding assembly, the feeding assembly comprises a feeding support arranged on a machine frame, and two branch nylon pipe bases are arranged on the feeding support. A material pushing piece is arranged below the two nylon tube bases in a sliding mode, and two material pushing piece cavities are formed in the material pushing piece. A guide seat is arranged below the material pushing part, and four guide seat cavities are formed in the guide seat; the feeding mechanism further comprises a material pushing power piece, the action end of the material pushing power piece is fixedly connected with the material pushing piece, and the material pushing piece horizontally reciprocates under the action of the material pushing power piece. A baffle plate is horizontally arranged on one side of the upper end part of the material pushing part; the feeding mechanism further comprises a feeding seat, four feeding seat grooves are formed in the feeding seat, and the feeding seat grooves are used for receiving the valve guide pipes falling off from the guide seats. The valve guide pipe feeding mechanism can improve the feeding efficiency of valve guide pipes, reduce the labor intensity of operators, reduce the production cost and improve the economic benefits of enterprises.

The invention discloses automatic intelligent production equipment for a water hammer valve, belongs to the technical field of production of water hammer valve accessories, and solves the problems that visual detection depends on a surface form and cannot directly judge an internal combination state, so that missing detection is easily caused, the bearing capacity of a welding seam is obviously reduced due to incomplete fusion, and brittle fracture is possibly caused under the impact of a water hammer. Comprising a welding mechanism, a cooling channel, a defect recognition mechanism and a discharging mechanism which are sequentially arranged, the defect recognition mechanism is coupled with the discharging mechanism, and the defect recognition mechanism collects acoustic response of a welding seam in real time by synchronously exciting ultrasonic waves, electromagnetic eddy currents and a laser interference field. A welded water hammer valve guide rod and a piston can be cooled and then moved to the position below the defect recognition mechanism, multi-physical-field characteristics are collected by synchronously exciting ultrasonic waves, electromagnetic eddy currents and a laser interference field to recognize weld defects, then the discharging mechanism is controlled to take out defective parts, and the product quality is ensured.

This invention discloses a centerless cylindrical grinding machine device for valve guides, belonging to the field of valve guide grinding. The device is used for infeed grinding of valve guides and includes a machine table, an adjusting frame and a grinding head holder respectively disposed on both sides of the machine table, and a workpiece support frame disposed between the adjusting frame and the grinding head holder and fixedly mounted above the machine table. This invention achieves axial elastic limiting of the valve guide through a clamping assembly and a reversing assembly, and, in conjunction with radial support from the workpiece support frame, effectively suppresses grinding movement and wobble of slender workpieces, improving grinding stability, coaxiality, and dimensional accuracy. After processing, it can automatically switch to a clamping and transfer mode for automatic unloading, achieving a high degree of automation. Simultaneously, cutting fluid can be directionally introduced into the inner hole of the valve guide and overflowed from a high position, forming internal convection heat transfer and significantly improving the cooling effect. After grinding, by flipping the drain hole, residual fluid in the inner hole is quickly drained by gravity, further stabilizing machining accuracy.

The utility model discloses a dismounting tool for a valve guide pipe of a cylinder cover. The dismounting tool comprises a supporting frame, the lifting platform is vertically arranged in the supporting frame in a sliding mode, a jack is fixedly connected to the top of the lifting platform, an installation pipe used for installing an ejector rod is fixedly connected to the bottom of the lifting platform, and a reset piece is fixedly connected between the lifting platform and the connecting cross beam. Notches at the two ends are clamped on the outer side of the supporting frame, it is guaranteed that the lifting table can vertically slide, and operation is easy, convenient and stable. A reset piece (spring) is fixedly connected between the lifting table and the connecting cross beam, after the jack extends to eject the valve guide pipe out, the spring can drive the lifting table to automatically reset, a fixing plate in the clamping assembly is adjustably installed, and through arrangement of a rotating base and a limiting arc plate, the angle of a workpiece can be flexibly adjusted, so that the valve guide pipe corresponds to the position of an installation pipe.

A fluid management system includes a fluid management controller and a fluid dispenser. The controller authorizes control of the one or more fluid management components over a wireless interface. A dispensing meter can be activated by an authentication device. The fluid meter includes a cartridge valve with a valve cartridge and a valve stem. The cartridge valve guides the valve stem and provides the only sealing surface for the dynamic seals and control seal disposed on the valve stem. The handheld meter dispenses through a nozzle, which includes an overmolded stem tip that generates a laminar fluid flow as the fluid exits the nozzle. The handheld fluid meter includes circuitry configured to invert the orientation of a visual output provided by a display of the handheld fluid meter to facilitate installation of the handheld fluid meter for use in an oil bar application.

The invention is a straight angle type one-way valve of a one-way valve with a slotted valve guide rod and a material delivery plunger pump, and the main point of the innovation scheme is that the existing round rod type guide rod is improved into a slotted guide rod, that is, a guide rod with four axial material discharge grooves, which comprises a threaded section, a sealing section and a guide section, and four axial planes are mainly processed in the guide section, and the four axial planes form four material discharge grooves with the inner circle of the inner wear-resistant sliding sleeve; the material particles entering the sliding gap between the guide rod and the inner wear-resistant sliding sleeve can be smoothly discharged through the four material discharge grooves; at the same time, the material discharge grooves reduce the contact surface between the guide rod and the inner wear-resistant sliding sleeve, reduce the friction resistance therebetween, make the one-way valve switch more flexible, and achieve two goals at once. The one-way valve of the plunger pump uses the valve guide rod, solves the technical problem that the material particles entering the sliding gap between the guide rod and the inner wear-resistant sliding sleeve of the valve are difficult to be completely discharged after a long time, which leads to the increase of the friction resistance therebetween, the valve jamming and the gradual failure of the one-way valve switch, and prolongs the service life of the sliding sleeve.

The utility model relates to the technical field of oil coating tools, in particular to a valve guide pipe oil coating mechanism and a tool suite, the valve guide pipe oil coating mechanism comprises an oil coating pipe, the oil coating pipe is provided with an inner cavity for containing engine oil and an oil outlet channel communicated with the inner cavity, a limiting part is arranged in the oil outlet channel in the radial direction, and the limiting part is arranged in the oil outlet channel. The limiting part is provided with an opening communicated with the oil outlet channel, and is provided with a first surface and a second surface which are positioned at two ends of the opening; the elastic connecting piece is connected into the oiling pipe; the spherical piece is connected with one end of the elastic connecting piece so as to abut against one side of the first face of the opening and seal the oil outlet channel, at least part of the spherical piece is located on one side of the second face, the second face is used for abutting against the valve guide pipe, and the distance between the second face and the end of the oil outlet channel is the length of the portion, needing oil coating, of the valve guide pipe. The engine oil smearing length of each valve guide pipe can be consistent, the smearing uniformity is guaranteed, repeated dipping in engine oil is not needed, and the working efficiency can be improved.

The embodiment of the invention provides an air cooling exhaust valve and an internal combustion engine exhaust valve mechanism. The exhaust valve is composed of an upper valve rod, a valve body and a valve ring, the upper valve rod of the air valve is connected with the valve body of a rod hollow structure through friction welding, radial cooling drill holes are machined in the bottom and the arc position of the valve body, and cooling air exhaust holes are formed in the position close to the junction of a low-stress valve disc and the valve rod. And the valve ring and the valve body are welded to block and seal the drill hole at the valve disc. Cooling air flow channels are designed on the cylinder cover and the air valve guide pipe, and cooling air is conveyed to the exhaust valve. Cooling air is fed into a valve rod center hole and discharged into an air channel, the flow channel at the valve rod is simple in structure and large in flow section, the cooling drill holes cover the firepower face with high heat load and the round corner of the valve disc, the cooling effect is good, and the influence of the flow channel arrangement on the structure and rigidity of the air valve is small.

An apparatus for centering a pilot tool within a valve guide during valve seat cutting is disclosed. The apparatus includes a pilot tool and an adapter. The pilot tool includes a shank, and an extended section extending from the shank. The extended section includes an upper section and a lower section. The upper section extends from the shank, and the lower section extends from the upper section. The upper section includes a tapered section, and the lower section includes a straight section. The adapter receives the shank. In one embodiment, the upper section engages with the valve guide to operate the pilot tool as a fixed pilot to center within the valve guide. In another embodiment, the lower section operatively contacts the valve guide. The adapter rotates causing the lower section to rotate within the valve guide, and operate the pilot tool as a live pilot for centering within the valve guide.

The invention discloses a low-cost high-precision combustion system, which relates to the technical field of engine combustion systems, and comprises a cylinder body, a cylinder cover, an air inlet channel, an oil sprayer guide pipe, an air inlet valve guide pipe, a spark plug mounting guide pipe, an exhaust valve guide pipe and an exhaust channel, all the components are arranged in a split mode, independently manufactured and formed and then combined in a welding mode to form the whole combustion system. The air inlet valve guide pipe and the oil sprayer guide pipe are both welded to the air inlet channel, the exhaust valve guide pipe is welded to the exhaust channel, and the air inlet channel, the exhaust channel and the spark plug installation guide pipe are all integrally connected with the cylinder cover in a welded mode. The combustion system is separated from the engine assembly, the thin-wall structure combustion system is made of stainless steel with high strength and good heat transfer performance, and the weight of the engine is reduced; a lubricating oil channel, a cooling water channel and the like are not arranged inside, a large number of partition wall faces of an engine cylinder are saved, the wall face thickness is reduced, design is simplified, and engine manufacturing cost and manufacturing process difficulty are reduced.

A copper alloy for enhancing thermal conductivity and strength in a valve seat insert or guide material is provided. The copper alloy includes 3.0 wt. % to 5.0 wt. % iron, 3.0 wt. % to 5.0 wt. % zinc, and optionally 0.0 wt. % to 2.0 wt. % tin, based on the total weight of the copper alloy. The copper alloy can be water atomized to form particles, and the copper alloy particles can be blended with other particles and then pressed to form a slug. The slug containing the copper alloy is typically disposed between two porous parts formed of steel or another iron-based material to form a stack. The stack is sintered or otherwise heat-treated such that the copper alloy melts and infiltrates the pores of the porous parts. The copper alloy infiltrant is distributed more equally between the porous materials in the stack compared to prior art.

The utility model provides an overhead valve guide air inlet type two-stroke engine which solves the problems that waste gas cannot be fully swept away due to the fact that a four-stroke working mode of a traditional overhead valve type engine is improved into a two-stroke working mode, and combustion efficiency and emission performance are poor. According to the technical scheme, the overhead valve guide air inlet type two-stroke engine comprises an engine body set and an air distribution mechanism provided with an overhead valve, an air guide pipe moving along with an air inlet valve rod through a support sleeve is arranged on the air inlet valve rod of the air distribution mechanism, the air guide pipe is close to the head of the air inlet valve, and a front end air outlet is reserved between the front end of the air guide pipe and the head of the air inlet valve. The rear port of the gas-guide tube communicates with the gas inlet channel; an air inlet cam of the air distribution mechanism is provided with an air inlet cam protruding part which pushes the front end of an air guide pipe of an air inlet valve to stretch into an inner cavity of the air cylinder body. By guiding and scavenging the inlet air, the engine can go deep into the cylinder body to purge the combusted waste gas, open the exhaust valve to work and fully sweep the waste gas, so that the scavenging efficiency is greatly improved, and the combustion efficiency and the emission performance are improved.

The utility model discloses a diesel engine valve guide pipe disassembling and assembling device which comprises a frame and a screw rod, the screw rod is connected to the frame in a threaded mode, and the end, inserted into the frame, of the screw rod is connected with a disassembling guide rod or an installing guide rod so that a valve guide pipe can be separated from a cylinder head or the valve guide pipe can be installed in the cylinder head. The end, away from the screw, of the frame is provided with a guide-out hole, and the detached valve guide pipe falls off along the guide-out The installation guide rod is connected with a base plate which abuts against one end of the valve guide pipe, and the installation guide rod abuts against the installation height limiting block so that the valve guide pipe can be inserted into the cylinder head. According to the diesel engine valve guide pipe dismounting device, the dismounting guide rod is inserted into the valve guide pipe, the valve guide pipe is separated from a cylinder head, it is guaranteed that the valve guide pipe does not deform or break in the dismounting process, damage to the cylinder head is reduced, the mounting guide rod and the dismounting guide rod are replaced, the valve guide pipe is mounted in the cylinder head, and the dismounting efficiency is improved. The installation size of the valve guide pipe is guaranteed, installation can be in place at a time, and the protruding height does not need to be adjusted.

The utility model belongs to the technical field of environmental tests, and particularly provides a device for controlling the temperature of an environmental test medium, which comprises an environmental temperature box. A medium box, a first temperature sensor, a liquid level meter, a filter, a test sample, a pressure sensor, a second temperature sensor, a regulating valve, a flow meter, a heat exchanger, an overflow valve and a heat exchange fan are arranged inside the environment temperature box, and a circulating pump is arranged outside the environment temperature box; the medium box provides a liquid medium for a test sample; the pressure sensor detects the pressure of the liquid medium at the test sample outlet; the regulating valve regulates the pressure of the liquid medium at the test sample outlet; the flow meter detects the flow of the liquid medium at the test sample outlet; the circulating pump conveys a liquid medium in the medium box into the heat exchanger and exchanges heat with the environment temperature box through the heat exchange fan; and the overflow valve guides the redundant liquid medium at the outlet of the circulating pump back into the medium box. The device has the advantages of being controllable in medium temperature, low in cost and low in energy consumption.

A wrought alloy for a bearing material for use as valve guide or in turbochargers of internal-combustion engines operated with ethanol-containing fuels. The composition of the wrought alloy is as follows in wt %: Zn: 25.0-34.0%; Fe: 0.8-1.2%; Sn: 0.8-1.2%; Al: 1.3-1.7%; Si: 0.2-0.45%; and Pb: up to 0.1%, with the balance being copper and unavoidable impurities. The sum total of all elements not belonging to the group of the elements copper, zinc, iron, tin, aluminum and silicon is at most 0.3 wt %. The alloy has a microstructure including precipitates in the form of silicides with a fraction of 0.5 to 2.0 vol %.

The invention provides an engine. The engine comprises an air cylinder body, an air cylinder cover and an air intake and exhaust system. The cylinder cover is connected with the cylinder body and forms a combustion chamber with the cylinder cover, the cylinder cover comprises a ventilation channel and a valve guide pipe, the ventilation channel is communicated with the combustion chamber, and the valve guide pipe forms a channel communicated with the ventilation channel; the air inlet and exhaust system comprises an air valve penetrating through the channel, and at least part of the air valve extends into the air duct and controls the air duct to be communicated with or disconnected from the combustion chamber. The air inlet and exhaust system further comprises a valve sealing ring, the valve sealing ring is installed on the air cylinder cover and located at the joint of the air passage and the combustion chamber, the valve sealing ring is suitable for containing at least part of the valve, a cylindrical throat opening is defined by the inner edge of the valve sealing ring, and an included angle larger than 0 degree is formed between the axis of the throat opening and the axis of the passage. Through the arrangement, the air inlet efficiency of the air inlet channel is improved, fuel oil and air are fully mixed, and the combustion efficiency of an engine is higher.

The present invention provides a lubrication structure for an internal combustion engine that ensures the supply of lubricating oil to the valve train sliding members and suppresses the progression of wear as much as possible. [Solution] A lubrication structure 1 for an internal combustion engine comprising a camshaft 4 supported by a camshaft housing 5 and a cam cap 6, a valve member 8 having a valve guide 10 that supports a valve 9 that opens and closes when pressed by a cam portion 4', lubricating oil 3 supplied to the valve member 8, and an oil pump for supplying the lubricating oil 3, wherein an oil passage for supplying the lubricating oil 3 to the valve guide 10 by the oil pump is formed in at least one of the camshaft housing 5 and the cam cap 6, and at least one outlet portion 18 of the oil passage is formed in the side portion 19 parallel to the central axis of the cylinder on at least one of the camshaft housing 5 and the cam cap 6, and the lubricating oil 3 that is scattered from the outlet portion 18 is supplied toward the valve guide 10 so that it is scattered downward below the cam portion 4'.

The pressing head comprises a shaft seat and the pressing head, a connector of the pressing head is detachably connected with the shaft seat, the pressing head comprises a column body, the protruding connector is arranged on the front end face of the column body, a second cavity and a first cavity are sequentially formed in the rear end face of the column body from outside to inside, and the first cavity is communicated with the second cavity. The second cavity and the first cavity are coaxially arranged, the diameter of the second cavity is larger than that of the first cavity, an insertion head is arranged at the bottom of the first cavity and extends backwards, and the head of the insertion head penetrates out of the second cavity. The utility model has the beneficial effects that the pressure head, the valve oil seal and the shaft seat are assembled, then the insertion head is inserted into the valve guide pipe, and the shaft seat is pressed forcibly, so that the valve oil seal is sleeved on the valve guide pipe, the whole process is simple to operate, the workload is reduced, the valve oil seal can be used on other types of machines by replacing a front end pressure head, and the cost is saved.

The utility model discloses a temperature measuring structure of a valve guide pipe, a thermocouple is arranged outside the valve guide pipe, a mounting groove is arranged on the outer wall of the valve guide pipe, and the thermocouple is arranged in the mounting groove, and the temperature measuring structure of the valve guide pipe is simple in structure and convenient to measure.

The invention discloses cylinder cover valve guide pipe seat ring press-fitting equipment and a working method thereof. The cylinder cover valve guide pipe seat ring press-fitting equipment comprises a press-fitting equipment body, an inlet valve guide pipe seat ring press-fitting assembly and an exhaust valve guide pipe seat ring press-fitting assembly. The air inlet valve guide pipe seat ring press-fitting assembly comprises an air inlet valve seat ring pressing head mechanism, an air inlet valve guide pipe seat ring positioning mechanism, an air inlet valve guide pipe pressing head mechanism and a first operation panel. The exhaust valve guide pipe seat ring press-fitting assembly comprises an exhaust valve seat ring pressing head mechanism, an exhaust valve guide pipe seat ring positioning mechanism, an exhaust valve guide pipe pressing head mechanism and a second operation panel. The air inlet valve seat ring pressing head mechanism provides a power source for press fitting of an air inlet valve seat ring. The air inlet valve guide pipe seat ring positioning mechanism is used for fixing an air cylinder cover, an air inlet valve guide pipe and an air inlet valve seat ring. The air inlet valve guide pipe pressing head mechanism provides a power source for press fitting of an air inlet valve guide pipe. The press-fitting device can be compatible with press-fitting of various cylinder cover guide pipes and seat rings, model changing is easy, the press-fitting precision and the automation degree are high, and operation and maintenance are convenient and fast.

The invention belongs to the technical field of on-line maintenance of radiation-resistant valves of nuclear power plants, and particularly relates to a welding device for on-line replacement of a radiation-resistant valve guide rail. Comprising an adaptive bottom plate, the adaptive bottom plate is installed on a valve port of a valve body, a guide rail positioning block is fixed to one end of the adaptive bottom plate, a lifting base is connected with the adaptive bottom plate, a lifting module is placed on the adaptive bottom plate and installed on the lifting base, a lifting plate is installed on the lifting module, and a lifting screw is connected with the lifting plate. The radial module is fixed to the sliding block of the lifting module through a radial connecting plate, the axial module is fixed to the sliding block of the radial module through an axial connecting plate, and the rotating device is fixed to the sliding block of the axial module. The welding device has the beneficial effects that the structure is simple, and welding operation can be completed only through one-time installation; welding operation can be carried out remotely; the welding process can be monitored in real time; the radiation resistance is realized; the device is suitable for narrow spaces.

The utility model provides a valve guide system, which comprises an outer cylinder, a valve core, a valve core, a valve core, a valve core, a valve core, a valve core and a spring-back valve core, and is characterized in that the outer cylinder is provided with a compression runner port and a spring-back runner port positioned in the same cross-sectional area of the outer cylinder; the inner cylinder is arranged in the outer cylinder in a penetrating mode, a compression flow dividing opening is formed in the inner cylinder, and a springback flow channel is formed between the inner cylinder and the outer cylinder; wherein a compression cavity and a springback cavity are formed between the outer barrel and the inner barrel, the compression flow dividing opening is communicated with the compression flow channel opening through the compression cavity, and the springback flow channel is communicated with the springback flow channel opening through the springback cavity. According to the valve guiding system, on the premise that the damping stroke of the piston is not lost, the problem that compression flow and rebound flow are separated at the same horizontal height of a double-valve shock absorber is solved.