101results about How to "Small operating torque" patented technology

The invention discloses a side transmission case for a personnel airlock, which can be mounted at each of the inner side and the outer side of a cabin panel of the personnel airlock. The side transmission case structurally comprises a case body, wherein the case body is provided with a bearing block and hand wheels, the hand wheels include an upper hand wheel and a lower hand wheel which are used for operating a near-end sealing door and a far-end sealing door, the bearing block is used for supporting a straight-tooth driving gear system and an incomplete-gear system, and an incomplete gear III and a straight-tooth driving main gear are mounted on the same gear shaft. When the hand wheels are operated, the driving gear system can drive a connecting rod I and the incomplete gear to move, so as to drive a pressure balance valve, a locking device and a rack connected with a bevel gear of a middle transmission case to move to finally operate the near-end sealing door and / or the far-end sealing door. The side transmission case has the characteristics of small operating torque, cooperation of an incomplete gear structure and an interlocking device and arrangement of a boss-groove positioning device and the like, so that the side transmission case can be generally and separately adjusted and is very convenient to assemble and disassemble.

The invention relates to a double-frequency induced polarization method water tank physical simulation experiment device which comprises a guide rail platform, a pulley block, a vertical bracket, a leveling instrument, an emission electrode, a receiving electrode, a movable hand wheel, a lifting hand wheel and a water tank, wherein the guide rail platform is a guide rail pair formed by two long guide rails, a bottom plate and a sliding block; the guide rail platform is provided with the leveling instrument, the movable hand wheel, a synchronous belt wheel and a synchronous belt; the two ends of the guide rails are fixed on the water tank; the vertical bracket is provided with a guide sleeve; two vertical rods of an experiment frame pass through a central hole of the guide sleeve; the vertical bracket is provided with the pulley block, flat belts, the lifting hand wheel, a balance weight shaft and a roll spring steel belt; one end of the two flat belts is fixed on a cross rod in the middle of the experiment frame; an electrode is installed in a hole at the lower transverse side of the experiment frame; the movable hand wheel is rotated to drive the experiment frame to horizontally move; and the lifting hand wheel is rotated to drive the experiment frame to be vertically lifted. The double-frequency induced polarization method water tank physical simulation experiment device can simulate marine environment in the water tank, and can measure the activation rate, the electrical resistivity profile and electric depth of ore by adopting a double-frequency induced polarization method.

Disclosed is an electric operating mechanism for outdoor AC high-voltage insulating switches, which effectively solves the problem of large force moment and long braking time on current manual operating mechanisms. The electric operating mechanism comprises a chest and a mechanical driving device, an electric control device and a manual-electric closedown device, which are arranged inside the chest. The technical proposal lies in that: driving teeth, a clutch internal tooth sliding sleeve and a duplicate gear sleeve, are arranged on a transmission shaft of the mechanical driving device, on which a worm wheel is fixed; the duplicate gear sleeve is meshed with a gearwheel on an output shaft; the peripheral retaining boss is wedged with a transmission fork which is driven by a crank shaft and is controlled by a hand shank. The hand shank is used to control the transmission fork to enable the clutch internal tooth sliding sleeve to disengage or mesh with the duplicate gear sleeve. The electric operating mechanism is reasonable in structure, flexible and convenient to operate manually with a speed equal to that when being operated electrically; the electric operating mechanism can close or open the brake quickly, thus remarkably prolonging the service life of the inductive contact and the sensing finger, and improving operational safety and stability.

The invention discloses an emergent release device for ultralow temperature fluid handling equipment. The emergent release device comprises an upper ball valve, a lower ball valve, a valve on-off mechanism and a locking mechanism, wherein the valve on-off mechanism drives the two ball valves to be turned on or off synchronously, and the locking mechanism is arranged on the outer edge of the butt-joint faces of the two ball valves and used for controlling the two ball valves to be locked or released. The valve on-off mechanism comprises a four-connecting-rod mechanism installed between valve rods of the two ball valves and a driver installed on a valve rod base on one side of the two ball valves. According to the emergent release device, the valves can be independently turned off on the condition that a handling arm is not adopted, the sealing performance of the valves is good, and the valve on-off mechanism is simple in structure and convenient to operate; and when the two ball valves are released, the handling arm will not be hooked, and the accident that the handling arm collapses is eradicated.

Provided is a centrifugal electromagnetic clutch. The centrifugal electromagnetic clutch comprises a first rotating body, a second rotating body and a transmission shaft, wherein the second rotating body can rotate along with the first rotating body, power of the second rotating body is transmitted out through the transmission shaft, the second rotating body is arranged inside the first rotating body in a radial mode, and a centrifugal clutch device is axially arranged between the first rotation body and the second rotating body, and is arranged inside the second rotating body in a radial mode. The centrifugal clutch device comprises a plurality of magnetism-conductive centrifugal pieces, an electromagnetic coil, a magnetism-conductive connecting body and a magnetism-conductive supporting body, wherein the magnetism-conductive connecting body is fixed to the inner side of the first rotating body, and is arranged outside the electromagnetic coil in a radial mode, the magnetism-conductive supporting body is installed on the transmission shaft, the first rotating body is fixed to the magnetism-conductive supporting body, the magnetism-conductive centrifugal pieces are distributed along the outer circumference of the electromagnetic coil, one end of each magnetism-conductive centrifugal piece is hinged to the position between the magnetism-conductive connecting body and the magnetism-conductive supporting body, friction plates are arranged on the outer surfaces of the magnetism-conductive centrifugal pieces, wear-resistant layers are arranged on the inner wall face, opposite to the friction plates, of the second rotating body, when the electromagnetic coil is deenergized, the friction plates are attached to the wear-resistant layers of the second rotating body, and when the electromagnetic coil is energized, the friction plates are separated from the wear-resistant layers of the second rotating body.

The invention discloses an isolating valve sealed by a structural ceramic valve clack and a metal elastic valve seat. The isolating valve is mainly composed of a first part (A) and a second part (B), wherein the first part (A) is formed by connecting a valve body (1) with a valve cover (2), and the second part (B) is formed by connecting a ceramic valve seat (3) with a valve rod (6); an upward inlet (15) is arranged by taking the horizontal line of the valve body (1) as a center, and an outlet flow channel (12) downwardly bending relative to the cross center is arranged; a step hole center position of an intersection of the upward inlet (15) and the outlet flow channel (12) is equipped with elastic valve seats (10-14) and elastic valve seats(1-4) arranged on a body; and circular arcs (10-2,14-1,1-4) and sealing surfaces (3-1) of a ceramic valve clack (3) are contacted and closely fitted to form a sealing pair.

The invention provides transmission cases on two sides of a personnel airlock. The transmission cases solve the technical problems that transmission cases on two sides of an existing personnel airlock are complex in structure, large in adjustment difficulty coefficient and poor in practicability and time and labors are wasted in operation. Each transmission case is provided with an upper cover plate, a lower bottom plate, side cover plates, a worm, a worm-wheel shaft, a rotating shaft and an interlocking device; the worm-wheel shaft is provided with a bearing and longitudinally penetrates through a box body and is fixedly connected with the box body through the bearing; the worm and the rotating shaft transversely penetrate through the box body and are fixedly connected with the box body, and the worm is meshed with a worm wheel. The transmission cases on the two sides of the personnel airlock can be widely applied to the transmission field.

The present invention discloses an electric hydraulic test plugging valve for steam-electric power generation, and it is characterized by that the lower portion of valve body of plugging valve is equipped with a cross pipe which can be used for connecting pipeline, the upper portion of the valve body is equipped with valve cover, and on the top portion of said valve body an electric device is mounted, the upper end of the valve rod is connected with the electric device, and its lower portion is connected with valve flap mounted in the valve body, on the ring recessed groove positioned at side surface of valve flap and mounted in the interior of cross pipe a valve seat is set, said valve seat is formed from inner valve seat and outer valve seat which can be leftward and rightward floated, an elastic sealing body is mounted between inner and outer valve seat, and a spring is mounted beween outer valve seat and bottom wall of ring recessed groove on the valve body. Said plugging valve can quickly implement conversion of opening and closing functions.

The invention provides an unfurled metal sealing ball valve. A ball body is in a two-piece structure. A circular conical surface for containing a valve rod and holes in consistent fit with a tapered plug are arranged at the center of the ball body. Two tapered holes extend along a flow channel direction in the same direction and butterfly-shaped springs are arranged at upper and lower ends of the center of the ball body; the upper end of the ball body is provided with a cross straight notch for containing a pin and the pin is fixedly connected with the hole on the circular conical surface of the valve rod; and spiral springs are contacted with the butterfly-shaped springs through one end of the valve rod and the other ends of the valve rod is placed into a middle stage hole of a valve body. The top end of the valve body is provided with an annular boss and a through hole is matched with a transposition sleeve; a cylinder body which stretches out of the outer side is arranged at the outer edge and the inner part of the cylinder body is provided with a thread which is engaged with a screw plug. Annular notches are symmetrically designed on the circumference of the part which is close to the lower part in the middle of the transposition sleeve at the 90-degree direction; a straight line section is arranged in a range of about 70-degree direction and a downward inclined line section is arranged in a range of about 20-degree direction; the inclined degree ratio of the inclined line section to the straight line section is in a range of 3-5 degrees; and the inner part of the upper end of the transposition sleeve is a thread connected with the thread on the valve rod.

The invention discloses a low-temperature ball valve, which comprises a valve body, a valve cap, valve seat assemblies, a ball body, a valve rod and a stationary shaft, wherein the valve body and the valve cap are respectively provided with a runner; the valve body and the valve cap are connected by a gasket, a stud and a nut; the ball body is arranged in the valve body; and two sides of the ball body are respectively provided with one valve seat assembly respectively connected with the insides of the valve body and the valve cap. The low-temperature ball valve is further provided with a driving device, wherein the driving device is connected with the upper part of the valve rod by a key, and the lower end of the valve rod is connected with the ball body. According to the low-temperature ball valve disclosed by the invention, a welding line for connecting the valve body and the valve seat adopts a full-automatic welding technology, and the valve body and the valve seat adopt the U-shaped welding line so as to eliminate a leaking point in the welding line for the valve body and the valve seat. The valve sealing surface adopts Stellite hard alloy, the surface is formed by rolling, and the service life of the valve is prolonged. The sealing surface adopts automatic grinding, and the goodness fit of the sealing surface is improved.

The invention discloses a ball valve. The ball valve comprises a valve body, a valve cover, valve seat assemblies, a ball, a valve rod, a spring, a fixed shaft, a long-neck support and a top support and further provided with a driving device. The valve body and the valve cover are respectively provided with a flow channel and connected through a gasket, a stud and a nut; the ball is arranged in the valve body, and the two sides of the ball are respectively provided with one valve seat assembly and connected with the inside of the valve body and the inside of the valve cover respectively; the driving device is connected with the upper portion of the valve rod through a key, the lower end of the valve rod is connected with the ball, and the driving device rotates to make the valve rod and the ball to rotate around the axis so that the valve can be opened or closed by 90 degrees. Corners of an upper seal support, a packing gasket and a packing pressing sleeve are designed into rounded corners, the gap is appropriately increased for inner holes, and the gap is appropriately reduced for outer circles. Roller forming and surface nitriding treatment are adopted for the surface of the valve rod to improve the surface hardness of the valve rod and prevent the surface of the valve rod from straining and galling, mechanical abrasion is reduced, and operation torque of the valve is reduced.

A cage-style tap-changer without excitation for transformer relates to up and down brackets and there are insulating pole of edge connecting between them. There are interval ring static state relays on the axes of insulating pole and there are dynamic relays at the up and down brackets and inside of the ring static state relays. The dynamic relays connects with one up / down gearing, and there are dynamic relays connects with closed two static state relays in the outside of dynamic relays subassembly and the corresponding ring static state relays. The beneficial effect is 1. The dynamic and static state relays touch with stabilization and short moment when switch operation moves along the axes and high orientation precision. 2. Static state relays enhance the stiffness of cage-style with strong anti-short ability of switch for large current and single-phase switch with high and insulated level.

The invention discloses a personnel gate transmission case based on sheave transmission, which comprises a case body, a connecting arm, a balance valve opening component, a transmission gear component, an interlocking component and a hand wheel shaft and is characterized in that the personnel gate transmission case further comprises a gate lock sheave, a gate opening sheave, a balance interlocking sheave and a main drive shaft component. The main drive shaft is mounted in the case body; a single-arm driving arm, a double-arm driving arm of the gate lock sheave and the gate opening sheave, and a secondary transmission gear are assembled on the main drive shaft, are independent of one another axially, and have phase difference at a certain angle; the secondary gear is engaged with the transmission gear component; the single-arm driving arm can be freely connected with the balance interlocking sheave; and the double-arm driving arm can be freely connected with the gate lock sheave and the gate opening sheave respectively, drive the balance interlocking sheave, the gate lock sheave and the gate opening sheave to realize rotation and position through notches in the sheaves and locking arcs of the notches, drive the balance valve opening component to open a balance valve, drive the gate lock sheave to open a gate lock and drive the gate opening sheave to open a sealing gate.

The invention relates to a five-prevention interlocking mechanism, which comprises a lower door ground interlocking unit and a load isolation and ground isolation interlocking unit. The lower door ground interlocking unit consists of a door hanging arm plate, a lower door interlocking connection pull rod, an interlocking connector, a crank arm and a lower door interlocking shaft shaft, wherein the door hanging arm plate is connected with the lower end of the lower door interlocking connection pull rod, the upper end of the lower door interlocking connection pull rod is connected with the interlocking connector, the interlocking connector is connected with one end of the crank arm and the other end of the crank arm is connected with the lower door interlocking half shaft. A ground baffle which is arranged in the front of a ground operating shaft is locked or unlocked under the situation that a lower door is not hung or hung on the door hanging arm plate to control the opening / closing of a ground switch and the opened / locked state of the lower door. The load isolation and ground isolation interlocking unit consists of an isolation indicating wheel, a ground indicating wheel, a cam and a camshaft. After an isolating switch and the ground switch are closed, the ground baffle and an isolating baffle are respectively locked in the front of the ground operating shaft and an isolation operating shaft to prevent the ground switch and the isolating switch from being mistakenly operated. The five-prevention interlocking mechanism has the advantages of small size, convenience in installation, simplicity and convenience in operation and high safety and reliability.

The invention relates to a straight-flow shut-off valve which is sealed with an elastic valve seat under fluid pressure. According to the straight-flow shut-off valve, a support body which is arranged on a circular table of a valve flap additionally is connected with the valve flap and the circular table by a rib plate, and one end of the support body is supported in an annular groove which is bulged outwards out of the upper part of a valve body; a pin shaft is connected with a hole in the support body by a shaft hole of the valve body; a connecting body which extends out of one side is arranged at the position which is close to the upper part of a center circle on one side of a sealing body on the valve flap; a notch in the end of a valve rod is matched with two planes of the connecting body, and a straight notch is connected with a pin arranged in a pin hole in the tail end of the valve rod; an angle alpha of an inlet flow channel A and an outlet flow channel B of a valve body is 45 degrees; the circular arcs of the sealing ends of elastic valve seats are consistent with those of the valve bodies; the excircle is matched with a flow channel hole in the valve body; and upper and lower planes outside the elastic valve seat are hermetically connected with a lower sealing gasket in the valve body and an upper sealing gasket in a valve cover respectively.

The invention discloses an adjustable water-turbine generator set cooling fan which comprises a fan center, blades, operating force arms, driving pins and synchronous operation rings. A pivot is arranged at one end of each blade, a plurality of first through holes are circumferentially formed in the fan center, the end of each pivot is connected with one end of the corresponding operating force arm through a cylindrical pin after the pivot penetrates the corresponding first through hole, and the other end of the operating force arm is connected with the corresponding synchronous operation ring through the corresponding driving pin. Special bearing bushes are arranged among the pivots and a shaft hole of the fan center to accurately position and decrease an operating torque, one end of each operating force arm is clamped on the pivot of the corresponding blade, mounting and adjusting are facilitated when reliable operations are ensured, the other end of the operating force arm is connected with the corresponding synchronous operation ring through the corresponding driving pin, the synchronous operation rings slightly move along the axis direction of a generator shaft to drive the operating force arms to rotate around axes of the pivot of the blades, and mounting angles of the blades are changed.

The invention discloses a wear-free anti-erosion clutch valve. The wear-free anti-erosion clutch valve comprises a valve body, a rotating valve element and a valve rod, wherein the valve body is provided with an input port and an output port, the rotating valve element is provided with a channel, and an input sealing surface and an output sealing surface are formed on one side of the channel; thevalve rod is connected with the rotating valve element to rotate and switch, wherein rotating opening and closing angles opened or closed non-simultaneously are formed between the input sealing surface and the output sealing surface, and the input port and the output port are sequentially closed / opened in a staggered mode when rotation is carried out. According to the wear-free anti-erosion clutchvalve, the service life is long, opening / closing torque is small, the flow resistance coefficient is small, the energy-saving effect is good, the manufacture, installation and maintenance are convenient, and the damage problem of abrasion (or scratch) and erosion (such as scouring and cavitation) of the valve is solved.

The invention discloses a single-pedal type foot valve. The single-pedal type foot valve is characterized by comprising a pedal, the pedal is connected with a connecting plate, a hinged support, a hinge base, push rod bushing assemblies and a small valve body in sequence, push rods penetrate through the connecting plate, the hinged support, the hinge base, the push rod bushing assemblies, the small valve body and a piston, and the push rods are connected with a valve plug assembly arranged in a valve body. The single-pedal type foot valve is compact in structure; due to the fact that the design that an O-shaped ring and a Y-shaped sealing ring are used for sealing and guiding is adopted, the frequency of the phenomenon of internal leakage can be reduced, the opening-and-closing characteristic is improved, the single-pedal type foot valve has the advantage that stability of outlet pressure is good, the service life of a pilot system is prolonged, and overall stability of an excavator system is ensured.

The invention relates to an adjustable high-pressure multiport distributing valve. The distributing valve comprises a valve body, a valve cap, a spool and a valve stem, wherein the valve body and the valve cap are coaxial and are arranged through bolts; the lower part of the valve body is used as the inlet of the runner; a support is arranged on the upper part of the valve cap coaxially; the valve stem is arranged in the support coaxially through a bearing and a bearing cover; a handle is arranged on the bearing cover in the radial direction; the spool is hinged with the lower end of the valve stem in the valve body; radial runners are uniformly distributed on the spool in the radial direction; and distributing pipes are fixed on a radial runner which is arranged outside of the valve body and corresponds to the spool. The adjustable high-pressure multiport distributing valve can satisfy the demands of different pipelines on the regulation of the flow of the medium and ensures that the medium in the pipeline enters through one inlet and leaves through a plurality of outlets; the flow can be better distributed, the distributing valve can act as a main switch, the other sub-valves on the pipeline can be conveniently repaired and displaced, the valve housing type sealing structure is adopted to increase the sealing surface and has better sealing and closing effects; and the distributing valve can be widely used in the high-pressure water injection system of the oil field.

The invention discloses a wedged hard sealing wear resistant gate valve. The gate valve comprises a valve body, a valve base, a gate plate, a valve rod, a valve cover and a driving device. The valve body and the valve cover are made of WCB; the sealing surface of the valve adopts is made of hard alloys; and the surface is formed through rolling. A welding lineconnecting the valve body and the valve base is realized by a full-automatic welding method; and the welding line of the valve body and the valve base is U-shaped. The sealing surface of the valve is made of Stellite hard alloys; the surface is formed through rolling; and the hardness can reach HRC 45; and the sealing surface is automatically grinded. The gate valve is an elastic gate plate; a tie piece is added at one side of a T-shaped groove of the gate plate; the edge part of a guide groove of the gate plate takes the shape of a round corner; the corners of an upper sealing base, a filler pad and a filler pressure sleeve of the gate valve all take the shape of round corners; and the surface of the valve rod is formed through rolling, and is subjected to nitriding treatment. The service life of the valve is prolonged; and the tightness of the valve is improved.

The invention discloses a pipe control valve, in particular a metal seal wear resisting ball valve. The metal seal wear resisting ball valve comprises a first valve body part, a second valve body part, a valve rod, a ball body, an inlet valve base, an outlet valve base, a disc spring, a lower gasket, an upper gasket, a lower filler, a filler box, an upper filler, a filler pressing sleeve and a filler pressing plate; an arc gap A and an arc gap B are formed in a runner port of a runner of the ball body, and are positioned in one side, forming a fine circulating channel with the inlet valve base and the outlet valve base, of the runner port of the runner when the ball body is slightly opened or to be closed. Through new designs of a ball body structure, an inlet valve base structure, a seal design and a ball body guide structure, a circulating form of a medium in the valve opening / closing process is improved, the erosion and the wear of the medium to the ball body and the valve bases are reduced, the sealing performance of the valve is improved, the operation torque is reduced, the valve opening / closing action is more stable, and the safety, the reliability and the service life of the valve are guaranteed.

The invention discloses a clamping butterfly valve body. The upper part and the lower part of a cavity of the valve body are respectively provided with a rotating shaft hole of a valve column, two peripheral edges of the inner peripheral surface of the cavity of the valve body matched with a valve plate are provided with a boss respectively, the inner peripheral surface and the peripheral edges of the two bosses form an arc-shaped sealing surface, and crossing parts of the arc-shaped sealing surface and the rotating shaft holes of the valve column are provided with a widened boss. Since the two edges of the inner peripheral surface of the cavity of the valve body matched with the valve plate are provided with the bosses and are processed into the arc-shaped surface, the valve plate is assembled into an arc-shaped sealing strip via a special valve plate assembly tool during assembly and is then rotated until the end of the valve body is matched with the end of the valve plate, and the assembly is easier and more convenient. Due to sealing of the arc-shaped surface, the sealing surface is matched better.

In one aspect of the invention, an off-circuit tap changer includes a switch base and a rotation shaft penetrating the switch base. An upper end of the rotation shaft is connected to an operation positioning device, a lower end of the rotation shaft is disposed with moving contacts, and fixed contacts corresponding to the moving contacts are circumferentially disposed at a spacing on the switch base; the moving contacts are radial elastic rolling moving contacts, and the radial elastic rolling moving contacts span between two adjacent fixed contacts and closely contact the fixed contacts.

The invention discloses an ultralow-temperature online maintenance ball valve. The ball valve comprises a valve body, a ball body, a valve rod, a valve cover, a stuffing box body, a handle, a left valve seat and a right valve seat, wherein the valve cover is fixed at the upper end of the valve body through bolts, the stuffing box body is arranged at the upper end of the valve cover, and a cavity is formed in the middle shaft of the stuffing box body; the valve rod is inserted into the cavity, and the left valve seat and the right valve seat are arranged in the valve body; the ball body is clamped between the left valve seat and the right valve seat, and the lower end of the valve rod penetrates through the valve cover and is connected with the upper part of the ball body; and the upper endof the valve rod is connected with the handle through an interlocking plate. The ultralow-temperature online maintenance ball valve has the beneficial effects that finite element analysis and optimization design are carried out on the structural strength, the sealing structure is analyzed and tested, so that the sealing performance is more reliable, the production process is simple, the operationtorque is small, and the bending strength is improved.

The invention discloses a manual plunger valve device with an upper valve seat body and a lower valve seat body capable of being sealed independently. The manual plunger valve device comprises a handle, a support, a valve rod, a valve body and a runner and further comprises a push rod and a valve seat. The push rod is connected with the support through a thread structure, the guiding performance is good, and stability is high. The valve seat is made of PEEK materials and provided with a runner hole, a weakening hole and a plugging hole. The runner hole is formed in the runner axis direction of the valve seat. The plugging hole is formed in the valve rod axis direction. The weakening groove is formed in the direction perpendicular to the runner hole and the plugging hole. Due to the valve seat, the valve operation torque becomes small, and meanwhile the valve seat bodies above and below the runner hole can be locally sealed with the valve body independently. The manual plunger valve device has the beneficial effects that the valve is high in stability and good in guiding performance, the valve operation torque is small, and the valve seat bodies above and below the runner hole can be locally sealed with the valve body independently.

The invention discloses a cone stove valve and relates to the technical field of mining valves. The cone stop valve comprises a valve body, a valve rod, a valve bushing, a barrel, a hand wheel and a valve rod bushing, wherein the valve bushing is arranged in the valve body and sleeves the valve rod, and a first balance cavity for allowing liquid to flow into is formed between the valve bushing andthe valve rod; the barrel is connected with the valve body and sleeves the valve rod; the valve rod bushing is arranged inside the barrel and sleeves the valve rod, and a second balance cavity for allowing the liquid to flow into is reserved between the barrel and the valve rod bushing; the valve rod is provided with a damping channel for allowing the liquid to flow into and enabling the first balance cavity and the second cavity to communicate with each other; and the hand wheel is connected with the valve rod. Through arrangement of the first balance cavity and the second balance cavity, resistance generated when the hand wheel is screwed in the opening or closing process of the cone stop valve is greatly reduced, operation torque can be reduced so that labor for operation can be saved,and meanwhile, by means of a dust hood, complicated conditions under a mine are isolated and the situation that the hand wheel is exposed in the severe condition and contaminated to result in the rusting risk is prevented.

The invention discloses a self-balancing stop valve which comprises a valve body, a valve seat, a valve clack, a valve rod, a valve deck and a valve-rod operating mechanism, wherein the lower end of the valve rod is movably connected to the valve clack, and drives the valve clack to slide upwards and downwards so as to realize operations that the valve clack and the valve seat are fitted, and the valve clack is connected with the valve seat or the valve clack is separated from the valve seat; the lower end of the valve rod passes through the valve deck and then is connected to the valve clack, and contact surfaces between the valve rod and the valve deck are connected in a tight coupling mode; the valve-rod operating mechanism is connected to the valve rod so as to control the ascending or descending of the valve rod; the self-balancing stop valve also comprises a first guide cylinder, the guide cylinder is fixedly arranged on the valve body, and the valve clack is hermetically sleeved on the inside of the guide cylinder; and the valve clack is provided with a balancing through hole for communicating an inner cavity (formed between the valve clack and the guide cylinder) and an outer cavity (formed between the valve clack and the valve body). In the invention, when the valve clack is opened or closed, the up-and-down convection of media can be implemented by the through hole, thereby achieving an effect of up-and-down pressure balancing and reducing the operating torque; and the self-balancing stop valve is flexible and convenient in operation, and good in sealing effect.

The invention discloses a conical-sealed soft seal gate valve. The conical-sealed soft seal gate valve comprises a valve body, a valve cover, a valve rod, a rubber wrapping gate plate and a hand wheel; the valve cover is fixedly connected to the valve body; the valve rod and the rubber wrapping gate plate are both arranged in the valve cover and the valve body; the valve rod penetrates through the valve cover, and is fixed in the valve cover; the top end of the valve rod extends out from an upper end opening of the valve cover, and is fixedly connected with the hand wheel; the bottom of the valve rod is fixedly connected with the rubber wrapping gate plate; a sealing surface of the valve body is conical; the rubber wrapping gate plate includes a conical skeleton and a soft rubber wrapping layer; the upper part of the conical skeleton is a fixed part fixedly connected with the valve rod, and the lower part is a sealing part; and the soft rubber wrapping layer coats the lower surface of the conical skeleton, so that the soft rubber wrapping layer and the conical sealing surface of the valve body form soft seal. The gate valve can preferably solve the problems of loose sealing and leakage, and is a substitute good of a traditional gate valve.

The invention discloses a stop valve with a non-rotating valve rod. The stop valve comprises a valve body, a handwheel, the valve rod, a valve rod lining, a valve rod nut, a filler, a spline lining, a rear seat, a supporting frame, a valve core and a sealing device, wherein the valve rod is arranged in the valve body; the valve core is arranged below the valve rod; the sealing device is arranged between the valve core and the valve body; the upper part of the valve rod extends out of the valve body and is connected with the valve rod nut; the valve rod nut is connected with the valve body through the valve rod lining; the valve rod lining is fixed at the upper end of the valve rod; the filler fully fills between the valve rod and the valve body; the handwheel is fixed at the upper end of the valve rod nut; the spline lining, the rear seat and the supporting frame are arranged at the tail end of the valve rod. The stop valve disclosed by the invention can be quickly and easily repaired and maintained; the problem of leakage at a joint or leakage at a welded position is avoided, so that sealing is more complete; by the adoption of a valve-rod valve structure with a spline slot structure, abrasion to the valve rod and the sealing device can be alleviated, the sealing completeness of the stop valve is guaranteed, and the service life of the valve is prolonged.