4464 results about "Valve stem" patented technology

The invention discloses a use monitoring method and system for a knife gate valve, and relates to the technical field of knife gate valve monitoring, and the method comprises the steps: integrating a multi-mode sensor array at the root of a valve rod of the knife gate valve, an adjacent region of a sealing surface and in a valve cavity flow channel, and collecting multi-source signals in real time; performing dynamic fusion processing on the multi-source signal, and determining a feature extraction algorithm combination based on the current valve rod temperature and historical working condition data to extract a sealing surface damage feature, a transmission chain wear feature and a particle impact feature; constructing a dynamic anomaly judgment model, updating a clustering boundary of a vibration and torque characteristic space in real time, and performing decoupling diagnosis on a sealing surface dry friction risk, thread clearance expansion and gear wear in combination with time-frequency domain fluctuation analysis of a gear meshing frequency harmonic attenuation rate and an angular acceleration; and generating a three-level maintenance strategy according to the diagnosis result, dynamically adjusting the output torque of the execution mechanism and optimizing the switching frequency of the valve.

A cage-type dual wedge throttle valve, comprising: a housing having an inner cavity; a valve cover arranged at the top of the housing; a valve seat arranged in the inner cavity, wherein the valve seat comprises an outer valve seat and an inner valve seat, and a plurality of flow holes are distributed on the peripheral wall of the outer valve seat; a valve core, which comprises two wedge-shaped surfaces and two cylindrical surfaces which are axially symmetrically arranged about the central axis, wherein the cylindrical surfaces face the direction in which a fluid flows into the inner cavity, and the cylindrical surfaces can fit the inner wall of the inner valve seat; and a valve stem having the two ends respectively connected to a driving device and the valve core, wherein under the driving of the driving device, the valve stem can drive the valve core to reciprocate in the valve seat in the axial extension direction of the valve stem. By means of the above solution, primary throttling is achieved when a fluid passes through the outer valve seat, and secondary throttling is achieved as the valve core gradually extends into the inner valve seat; moreover, the valve core comprises wedge-shaped surfaces, and a long throttling stroke is formed, thereby improving the throttling switching performance of the throttle valve; the symmetrical arrangement of the two wedge-shaped surfaces can balance the pressure on the two sides, thereby improving the stability of the valve core under force.

The invention relates to the technical field of butterfly valves, in particular to an eccentric butterfly valve which comprises an eccentric valve body, a butterfly valve plate, a valve rod, a movable brake block and a transmission assembly, a water flowing cavity is formed in the eccentric valve body, the valve rod is rotationally installed on the eccentric valve body, the butterfly valve plate is rotationally installed on the valve rod, a sealing ring is fixedly installed on the butterfly valve plate, and the movable brake block is fixedly installed on the sealing ring. The sealing ring is attached to the water flowing cavity, two through holes are formed in the butterfly valve plate, two movable brake blocks corresponding to the through holes are installed on the butterfly valve plate in a sliding mode, and the transmission assembly is connected with the valve rod and the movable brake blocks at the same time. The through hole is formed in the butterfly valve plate, the movable brake block corresponding to the through hole is arranged, the movable brake block is controlled to change the opening and closing state of the through hole, impact force borne by the two sides of the butterfly valve plate from liquid when the butterfly valve plate rotates to open the water flowing cavity is reduced, the service life of the butterfly valve plate is prolonged, and the maintenance frequency of the eccentric butterfly valve is reduced.

The invention discloses an intelligent gas valve remote control and early warning system based on the Internet of Things, and relates to the technical field of valve monitoring. The valve processing module is used for preparing an intelligent valve through 316N stainless steel subjected to grain boundary processing, and a sealing ring, a fiber grating array and a QCM sensor are arranged on the intelligent valve; and the intelligent control module is used for acquiring the strain size of the fiber bragg grating and vulcanized film data through the fiber bragg grating array and the QCM sensor, and determining the lubricant release amount and the current regulation density. Strain of the valve rod is monitored in real time through the fiber bragg grating array, segmented friction force is obtained, and a nano lubricant is automatically released according to the friction force, so that the friction coefficient can be reduced, flexible opening and closing of the valve are ensured, and meanwhile, the surface density change of a vulcanized film is detected through the QCM sensor; and the valve rod is automatically triggered to rotate for self-cleaning or electrolytic polishing treatment, so that corrosion development can be effectively inhibited.

The invention discloses a special working condition corrosion-resistant valve and relates to the technical field of valves, the special working condition corrosion-resistant valve comprises a valve body, a valve rod, a butterfly plate and a transmission device, and a valve seat containing cavity is defined by a limiting ring and a valve seat gland in the valve body on one side of the butterfly plate; a valve seat which can only slide in the axial direction of the valve body slides in the valve seat containing cavity in a sealed mode, and the whole valve seat is completely contained in the valve seat containing cavity. A metal sealing ring is fixedly installed on the outer periphery of the butterfly plate, and a valve seat sealing face matched with the metal sealing ring in a sealing mode is arranged on the inner side of the valve seat. And an elastic element is arranged between the valve seat and the valve seat gland. According to the three-eccentric butterfly valve, through the collaborative design of the three-eccentric structure, the hidden valve seat, the L-shaped fluid channel and the self-adaptive plugging assembly, the advantages of the three-eccentric butterfly valve are reserved, the defect of exposed design of a traditional valve seat is overcome through structural innovation, and it is ensured that the valve is accurate in action and reliable in sealing in the opening and closing process; and the sealing structure is particularly suitable for special working conditions with strict requirements on sealing performance and service life.

The invention particularly relates to a double-sealing special-shaped ball valve which comprises a valve body, a valve rod rotating and lifting operation mechanism movably installed at the top of the valve body and a connector arranged at the bottom end of the valve rod rotating and lifting operation mechanism. A notch is formed in the top of the special-shaped ball valve clack movably installed in the valve body and can be tensioned, a thin-layer slotting plate part is arranged at the bottom of the special-shaped ball valve clack, deformation is easier, a side through opening is formed in the middle of the special-shaped ball valve clack and used for switching rapid water passing, and therefore the whole structure is an inverted-C-shaped special-shaped ball, and the special-shaped ball valve has the high opening and contracting functions. The left side and the right side of the special-shaped ball valve clack shrink and deform towards the middle portion, the two inclined holes close the notch in the top of the special-shaped ball valve clack, so that the second sealing gasket is separated from the first sealing gasket, and at the moment, in the whole rotating opening and closing process of the valve, the second sealing gasket of the special-shaped ball valve clack and the first sealing gasket of the connecting pipe do not rub; the service life is long.

The invention belongs to the technical field of valve maintenance, and particularly relates to a lifting device for a leakage guide ring of a nuclear island gate valve. The upper end of the supporting screw rod is arranged on a valve yoke frame, the lower end of the supporting screw rod is arranged on the drawing support, the drawing support is installed on a valve rod, the half-and-half type lifting nut is installed at the position of a threaded sleeve at the bottom end of the drawing support in a spliced mode and connected with the threaded sleeve through the set screw, and the half-and-half type lifting loop is connected to the lower end of the lifting nut in a hung mode. The lower end of the lifting screw rod is screwed into the original lifting hole and the new lifting hole of the leakage guiding ring, the height of the lifting loop is adjusted in a rotating mode, the upper end of the lifting screw rod is arranged in a screw hole of the lifting loop and is screwed and fixed through a nut, and the operating handle and the rotation preventing handle are arranged in the lifting nut and operating holes in the periphery of the lifting loop respectively. And the drawing bracket is fixed by connecting the original bolt hole of the valve with the supporting screw rod. On the premise of fully considering the limited operation space, the leakage guiding ring is efficiently detached, meanwhile, the complete effect of the leakage guiding ring is guaranteed, and the leakage guiding ring can be repeatedly used.

The invention belongs to the technical field of gate valves, and particularly relates to a scouring-resistant and corrosion-resistant gate valve which comprises a valve body, a valve cover is fixedly mounted on the valve body, a control component is arranged in the valve cover and controls a valve rod to rotate in the valve cover, the lower end of the valve rod is in threaded connection with a gate plate, and the gate plate slides in the valve body and the valve cover. The supporting component is arranged on the outer side of the valve body, the valve rod is controlled to rotate through the control component, the valve rod drives the gate plate to ascend or descend, then the gate valve is opened or closed, fluid is controlled to be conducted or blocked, and a ceramic sealing face is arranged at the joint of the interior of the valve body and the gate plate and has a certain corrosion-resistant effect. The filtering part arranged in the valve body can intercept and filter impurities in fluid, the corrosion resistance of the gate valve is further improved, in addition, the filtering part has the effect of reducing the flow speed of the fluid, impact of the fluid on the gate plate is reduced, and the valve body can be fixed to the ground or a building through the supporting part arranged on the outer side of the valve body. And the pressure of the gate valve on the pipeline is reduced.

A valve spring made of plastic, in particular for pretensioning a valve stem against a valve seat of a dispensing unit for dispensing a preferably liquid product, is proposed, wherein the valve spring has a plurality of spring elements arranged axially one behind the other, in particular along an axis or longitudinal axis. According to a first aspect, each spring element has two curved portions which are formed mirror-symmetrically with respect to one another and are connected to one another at their ends. According to a further aspect, the valve spring has a leaf-spring-like or cup-spring-like construction.

The invention discloses a stop valve, and relates to the field of valves. A stop valve comprises a valve seat, a valve cover, a support, a lead screw and a sealing valve column, the liquid inlet end and the liquid outlet end of the valve seat are fixedly connected with liquid conveying pipelines on the two sides through flange plates and bolts respectively, the valve cover is fixedly installed on the valve seat through bolts, the support is fixedly installed on the valve cover, the sealing valve column is arranged in the valve seat, and the lead screw is fixedly installed on the support. The lead screw is fixedly connected to the upper end of the sealing valve column, the upper end of the lead screw upwards penetrates through the valve cover, and the double-opening sleeve is rotationally connected to the support; the operation difficulty of resisting fluid pressure when the valve is opened manually is effectively reduced, the downward pressure of fluid becomes assistance during closing, a worker only needs to reversely rotate the rotating wheel to achieve smooth downward movement of the sealing valve column, operation is convenient and fast, tighter sealing can be achieved through the fluid pressure, and the reliability after the valve is closed is improved.

The servo valve comprises an outer shell, a valve assembly is arranged in the outer shell, the valve assembly is connected with a nested antler channel, and the nested antler channel is used for being connected with hydraulic equipment; the valve assembly comprises a rotary valve rod, a valve element and a valve sleeve, the axis of the rotary valve rod is perpendicular to the axis of the valve element, the valve element is coaxially and movably arranged in the valve sleeve, the bottom of the rotary valve rod is connected with a crankshaft, the crankshaft is sleeved with a first bearing, and the valve sleeve is arranged in the nested antler channel. A plurality of through holes used for being communicated with the nested antler channels are formed in the valve sleeve in the axial direction of the valve sleeve, a movable groove matched with the crankshaft is formed in the middle of the valve sleeve in the radial direction, a kidney-shaped mounting hole matched with the first bearing is formed in the valve element, and the length direction of the kidney-shaped mounting hole is perpendicular to the axial direction of the valve element. And at least one annular sleeve is fixedly arranged on the valve element and located on the two sides of the mounting hole in a sleeving mode, the annular sleeves are used for blocking the through holes in different positions, and the valve rod has the advantages that abrasion of the valve rod is reduced, and the service life is prolonged.

The present invention relates to the technical field of valves, and disclosed is a butterfly valve for use in ultra-low temperature environment. The butterfly valve comprises a valve body (1), a butterfly disc (2) in the valve body (1), a valve seat (3) matching with the butterfly disc (2), a valve stem (4) fixed to the butterfly disc (2), and an operating assembly (5) for driving the valve stem (4) to rotate, wherein a manhole (11) and an observation cover (12) covering the manhole (11) are provided on the valve body (1), and the observation cover (12) is detachably connected to an outer edge of the manhole (11) on the valve body (1); a cleaning assembly (6) is provided on an outer side face of the valve body (1), and the cleaning assembly (6) comprises a cleaning member (61) located above the observation cover (12) and a driving member (62) for driving the cleaning member (61) to slide back and forth on an upper side face of the observation cover (12); and an operating wheel (51) rotates to drive the driving member (62) to operate, and one side of the cleaning member (61) abuts against the upper side face of the observation cover (12), which reduces the difficulty of maintenance of the butterfly valve and improves the efficiency of maintenance of the butterfly valve. In addition, the rotation of the operating wheel (51) can drive the driving member (62) to operate, which in turn drives the cleaning member (61) to clean an outer surface of the observation cover.

The invention relates to the technical field of fluid control and management, in particular to a multi-stage pressure and noise reduction regulating valve which is characterized in that a fluid channel is arranged in a valve body and comprises a fluid outlet and a fluid inlet; the valve seat comprises a multi-layer valve cylinder and a first opening, a first throttling hole is formed in the multi-layer valve cylinder, and the first throttling hole communicates with the fluid inlet; the valve cage is fixedly connected with the valve seat and comprises a multi-layer valve wall and a first through hole, one end of the first through hole is connected with the first open hole, and the multi-layer valve wall is provided with a second throttling hole communicated with the fluid outlet; the valve cover is fixedly connected with the valve body; the valve plug is slidably arranged in the cavity; the valve rod is fixedly connected with the valve plug and arranged in the second through hole in a sliding mode. The valve cylinders and the valve walls are each provided with three layers, the first throttling holes in every two adjacent valve cylinders are arranged in a staggered mode, and the second throttling holes in every two adjacent valve cages are arranged in a staggered mode. Through the multiple layers of valve cylinders and the staggered throttling holes in the valve wall, the frequency of bubble formation and collapse is reduced, and fluid noise and the erosion risk of equipment are reduced.

The present invention relates to the technical field of ball valves, and discloses a multi-stage sealed hydrogen ball valve, which includes a valve seat, a valve core and a valve stem. The valve core is arranged inside the valve seat. Among them, a first support is fixed on the valve seat, a second support is arranged above the first support, and the first support and the second support are connected by a plurality of first connecting rods. A third support is arranged above the second support, and the second support and the third support are connected by a plurality of second connecting rods. Through the cable, the sliding plug and the annular bladder linkage mechanism, the present invention actively controls the separation of the sealing seat and the valve core before the valve core rotates, eliminates the frictional loss generated by direct contact during the opening and closing process of the traditional hard sealing structure. The sealing seat only contacts when the valve is closed, and there is no relative movement during the daily adjustment process, significantly prolonging the service life of the sealing component.

The invention discloses an adjustable critical flow injection allocation valve suitable for a thermal production well and a regulation and control method of the adjustable critical flow injection allocation valve. The technical problems that the tool preparation efficiency is low and the like are solved. The device comprises a supporting body, a plurality of mounting grooves are formed in the supporting body, a steam injection valve is arranged in at least one mounting groove, sealing plugs are arranged in the other mounting grooves respectively, an annular steam flow channel is formed in the inner wall of the supporting body, and the mounting grooves communicate with the steam flow channel; the steam injection valve comprises a valve body, a Venturi nozzle, a valve rod, a limiting part and a reducing part, step faces with the outer diameters sequentially reduced from top to bottom are formed on the surface of the reducing part, the different step faces are aligned to the pore throat face by adjusting the position of the valve rod, the area of an annular flow channel can be adjusted, and therefore the injection allocation amount is adjusted. According to the injection allocation valve, the injection allocation amount can be adjusted, secondary punching machining does not need to be conducted on parts, nozzles of multiple specifications and sizes do not need to be prepared either, the tool preparation efficiency is improved, and therefore the operation time efficiency is improved.

The utility model discloses an anti-loosening sealing diaphragm valve which comprises a valve body, a valve cover, an actuator, a valve cavity, a valve rod, a flow channel, a valve clack and a diaphragm. An inner shell is arranged in the valve cavity, an inner sliding block which is limited in the inner shell and slides in the horizontal direction is arranged in the inner shell, an embedded block is fixedly arranged at the left end of the inner sliding block, an embedded groove is formed in the right end of the valve rod, and when the flow channel is cut off by the valve clack, the embedded groove is just located on the left side of the embedded block. A driving spring for providing driving force for the embedded block to be embedded into the embedded groove is arranged in the inner shell; and an inclined guide contact surface is arranged on the embedded block. The utility model has the following advantages and effects: the inner sliding block can keep moving leftwards under the driving force of the driving spring, and then can push the embedded block to be embedded into the embedded groove of the valve rod, so as to lock the valve rod; longitudinal reciprocating offset of the valve rod is avoided, and the sealing performance of the valve clack is improved.

The ultra-high-temperature water-cooling switch valve comprises a valve body, a valve cover, a support, an actuator, a valve rod, a valve clack and a valve seat, an inlet flow channel, a middle cavity and an outlet flow channel which are sequentially communicated are formed in the valve body, a shaft hole is formed in the valve cover, and the valve rod penetrates through the shaft hole and extends into the middle cavity to be connected with the valve clack. The outer end of the valve rod is connected with the output end of the actuator, and the valve seat is installed between the outlet flow channel and the middle cavity and used for being in sealing fit with the valve clack when the valve is closed. An opening and closing piece cooling structure is arranged on the valve clack and the valve rod, a valve seat cooling structure is arranged on the valve seat, an inlet cooling structure is arranged in the inlet flow channel, a middle cavity cooling structure is arranged in the middle cavity, an outlet cooling structure is arranged in the outlet flow channel, and a valve deck cooling structure is arranged on the valve deck. Multiple cooling loops are adopted for cooling all parts of the valve, structural failures such as deformation caused by thermal barrier cold contraction under the alternating working condition are prevented, and normal operation of a valve pressure-bearing shell and a sealing element under the ultra-high-temperature working condition is guaranteed.

The invention relates to the technical field of gate valve equipment, and discloses a meter-front copper gate valve with a magnetic lockable structure, which comprises a valve body which is used as a basic component of the whole device and is used for assembling and bearing all mechanisms and subordinate lower structural parts; the valve basic mechanism is arranged on the valve body and used for being matched with other structural parts to execute basic operation treatment of the valve; and the locking protection mechanism is arranged at the upper part of the valve body. By adding and arranging an extreme protection mechanism, under the extreme working condition, a thermosensitive alloy sleeve of the mechanism expands in a high-temperature environment to push a locking pin rod to be inserted into a valve rod locking hole, a valve rod is mechanically locked, and fluid leakage caused by high-temperature damage of the valve under the extreme conditions such as a fire disaster is prevented; after the temperature is reduced, the pin rod is automatically reset, locking is relieved, follow-up normal operation is not affected, the valve body can be actively protected under the extreme working condition through the treatment mode, and the accident risk is prevented from being increased due to valve failure.

The invention discloses an intelligent control valve with a self-adaptive sealing structure, and relates to the technical field of valves, the intelligent control valve comprises a valve main body, a self-adaptive sealing mechanism is arranged in the valve main body, a control box matched with the self-adaptive sealing mechanism is arranged on the valve main body, and the valve main body comprises a valve body, a valve rod and a gate plate; a valve seat groove in sliding fit with the gate plate is formed in the valve body, the self-adaptive sealing mechanisms comprise sealing bottom rings, sealing side rings, piston rings and sealing gaskets and are installed on the left side and the right side of the valve seat groove, and the control box comprises a box body, a controller, a pressure regulating pipe and a motor and is installed at the lower end of the valve body. The valve has the advantages of automatically compensating sealing abrasion, monitoring the sealing state in real time and intelligently regulating and controlling, and the problems that a traditional valve is poor in sealing performance, high in maintenance cost and lack of real-time monitoring are solved.

The invention discloses an anti-drip device for hypochlorous acid disinfectant filling, comprising: a liquid discharge pipe, the liquid discharge pipe comprising a liquid inlet part and a liquid discharge part, the liquid inlet part being used for connecting an external chlorous acid disinfectant supply device, and the liquid discharge part being used for discharging a hypochlorous acid disinfectant; the valve element is arranged in the liquid discharging pipe in a matched mode, and the valve element can block one end of the liquid inlet part; the hollow valve rod is arranged on the valve element, and the hollow valve rod is connected with an external pressure air source through a hose; the driving mechanism is used for driving the hollow valve rod to move; wherein a first control valve is arranged on the hollow valve rod; an air guide groove is formed in the valve element, and the hollow valve rod is communicated with the air guide groove; a plurality of first air guide channels are evenly distributed in the valve element and communicate with the air guide groove. The anti-dripping device is good in anti-dripping effect, and waste of hypochlorous acid disinfectants can be reduced.

The invention belongs to the technical field of tire detection, and particularly relates to a full-automatic tire pressure detection device for an electric bicycle tire, the full-automatic tire pressure detection device comprises a base, a clamping mechanism, a lifting mechanism and a detection mechanism, the base is rotatably connected with a rotating disc; the lifting mechanism is used for driving the detection mechanism to lift, the detection mechanism comprises a connecting seat, and a positioning plate is connected below the connecting seat; the guide frame is vertically and fixedly connected with the positioning plate; the guide frame is connected with a movable seat, the movable seat is fixedly connected with a fixed plate, and the fixed plate is connected with a detection joint matched with a tire valve; the detector is connected with the detection joint through an air pipe; the clamping mechanism drives the tire to rotate, the inflating valve is rotated to the position below the detection mechanism, the lifting mechanism drives the detection mechanism to descend, in the descending process, the detection connector is automatically connected with the tire inflating valve in an aligned mode, and therefore the tire pressure is automatically detected, and the detection efficiency is high.

The invention discloses a fault monitoring sealing ball valve, belongs to the technical field of ball valves, and solves the problems that a self-adaptive compensation mechanism of an intelligent valve positioner can cover the degradation process of mechanical wear of a pneumatic sealing ball valve quietly during long-term operation, and finally sudden control instability is caused due to the fact that nonlinear wear exceeds a compensation limit. Comprising a valve body, a pneumatic actuator arranged on the valve body, a valve rod which is in transmission connection with an output shaft of the pneumatic actuator and located in the valve body, a valve ball fixedly connected with the valve rod and a fault prediction circuit. The fault prediction circuit comprises a multi-dimensional physical sensing array module, a high-speed synchronous acquisition and preprocessing module, a core signal processing and fusion analysis module, an artificial intelligence coprocessor module and a predictive maintenance decision and life cycle management module. Multi-dimensional signals are collected in real time, valve health is evaluated after fusion analysis, and early warning and maintenance decisions are output.

The invention provides an automatic inflating valve assembly line which comprises a circulation mechanism, a feeding mechanism, a screwing mechanism, a pressure measuring mechanism, a cap assembling mechanism, a marking mechanism and a discharging mechanism. The circulation mechanism comprises three circulation discs arranged in sequence, and a first carrying device is arranged between the circulation disc located at the first position and the circulation disc located at the middle position; a second carrying device is arranged between the circulation disc located in the middle position and the circulation disc located in the tail position, the circulation discs rotate along the circumference, a plurality of station holes are formed in the disc faces of the circulation discs in the circumferential direction, the procedures of assembling, pressure measuring, cap assembling, marking and the like of the inflating valves are integrated, all the procedures of assembling the inflating valves can be completed in one production line, and the production efficiency is improved. Automatic operation is achieved in the whole process, manual participation is reduced, multi-procedure integration is achieved, operation efficiency is improved, compared with traditional single-procedure operation, the number of times of vibration feeding is reduced, internal loosening and air leakage are avoided, and the assembling qualification rate of inflating valves is increased.

The invention belongs to the technical field of gate valves, and particularly relates to a gate valve which comprises a main valve body, a main valve seat and a main valve core. The main valve cover is arranged on the main valve body, and a main valve rod is arranged in the main valve cover; the hand wheel is arranged at the top end of the main valve rod; the main gate plate is arranged in the main valve body and can be in sealing fit with the main valve seat; the two auxiliary valve covers are symmetrically arranged on the two sides of the main valve cover, and auxiliary valve rods are arranged in the auxiliary valve covers; the auxiliary valve seat is arranged in the main valve body; the auxiliary gate plate is arranged in the main valve body; the transmission gear set comprises a driving gear arranged in the main valve cover and a driven gear arranged in the auxiliary valve cover, the driving gear and the driven gear are in transmission connection through a first intermediate gear, and compared with the prior art, the working stability of the gate valve is improved, and the service life of the gate valve is prolonged.

A valve has a body having an inlet, an outlet, and chamber. The inlet is in fluid communication with the chamber and the chamber is in fluid communication with the outlet. The valve has a stem designed to be received in the chamber. The valve stem has a valve surface. A corrosion-resistant or nonreactive sleeve is inserted into the inlet. The sleeve has a first end and a second end opposite the first end and a bore that extends from the first end to the second end. When the sleeve is inserted into the inlet, the second end extends into the chamber and is configured to be deformed within the chamber to secure the sleeve in the inlet. The deformed second end defines a valve seat configured to engage the valve surface of the stem.

The utility model belongs to the technical field of valves, and particularly relates to a gate valve which comprises a valve body, a valve cover is arranged on the top of the valve body, and a valve rod support is arranged on the valve cover. The valve seat is arranged in the valve body, and a first sealing piece is arranged on the valve seat; the valve rod is arranged on the valve body, the valve rod and the valve rod support in a penetrating mode, and a hand wheel is arranged at the top end of the valve rod; the flashboard is arranged in the valve body and matched with the valve seat, and the top end of the flashboard is connected with the bottom end of the valve rod; the supplementary sealing part comprises a second sealing piece arranged on the valve seat; the scale part is arranged in the valve rod bracket; wherein the second sealing piece can be matched with the gate plate to form a supplementary sealing surface when the gate plate is closed, the scale part can mark the moving stroke of the valve rod, and compared with the prior art, the use stability of the gate valve is improved.

A center hole is formed in a base, the lower end of a guide sleeve is coaxially fixed to the upper end of the base, a lower die is installed in the guide sleeve in a matched mode, and the lower end face of the lower die makes contact with the upper end face of the base. The conical section at the upper end of the valve rod and the lower half portion of the large-diameter section are matched with a lower die hole in the upper end of the center hole of the lower die, the upper die is arranged in the guide sleeve in a matched mode, an upper die hole in the lower end of the center hole of the upper die is matched with the large-diameter section of the valve rod, and the upper end of the upper die extends out of the guide sleeve. And the upper end of the valve rod is deformed and turned inwards until the belleville spring and the maximum-diameter position of the lower end of the valve head are completely wrapped in the stepped hole of the large-diameter section of the valve rod. According to the utility model, the technical problem that the valve rod assembly of the indicator valve cannot be directly assembled is solved, the problem that the valve head is arranged in the inner hole of the valve rod and the stroke of the valve is ensured by accurately controlling the length of the inner cavity when the valve head, the valve rod and the belleville spring of the indicator valve are assembled is effectively solved, the valve rod assembly is ensured to be smoothly assembled, and the assembling quality and the processing efficiency are ensured.

The utility model relates to the technical field of valves, in particular to a low-torque ball valve which comprises a valve body, a ball core, a valve rod and an executing mechanism, a flow channel and a rotating cavity for the ball core to rotate are arranged in the valve body, an overflowing hole penetrates through the center of the ball core, the executing mechanism drives the ball core to rotate through the valve rod, and a valve seat is further arranged in the valve body. The valve seat and the ball core are matched in a sealing mode to divide the flow channel into an inlet end and an outlet end, an auxiliary flow channel is formed in the valve body, the inlet end is communicated with the rotating cavity through the auxiliary flow channel, a through hole is formed in the ball core, the overflowing hole is communicated with the rotating cavity through the through hole, and a piston assembly is arranged in the auxiliary flow channel and comprises a piston piece and an elastic piece. According to the ball valve, fluid at the inlet end flows into the rotating cavity and the overflowing hole, hydraulic pressure on the inner side and the outer side of the ball core is balanced, and the rotating torque of the ball core is reduced.

The anti-blocking gate valve comprises a valve body, a gate plate, sealing rings and a valve rod, a medium channel is formed in the valve body, the valve rod drives the gate plate to move in the direction intersecting with the flow direction of the medium channel, the sealing rings are arranged on the two sides of the gate plate and are coaxial with the valve body, and a flow guide mechanism is arranged at an inlet of the medium channel. The flow guide mechanism comprises a flow guide frame connected with the inner wall of the valve body and flow guide blades distributed in the circumferential direction of the flow guide frame, an anti-deposition part is arranged at the bottom of the medium channel, the low position of the anti-deposition part points to a slag discharging structure at the bottom of the valve body, and a filtering assembly is detachably connected and assembled to the slag discharging structure. According to the scheme, the flow guide mechanism is arranged at the front end of the medium channel, the conduction blades enable media in the internal flow channel to form rotational flow, the flow guide mechanism can guide the media to flow to reduce impact, impurities are not prone to deposition through the rotational flow, and the problem that the impurities in the medium pipeline are prone to being accumulated at the bottom of the valve body can be solved through the inclined design of the anti-deposition plate.

The invention provides an anti-freezing and anti-crystallization hydraulic breather valve and a control method thereof, and belongs to the technical field of breather valves, the anti-freezing and anti-crystallization hydraulic breather valve comprises a valve body and an upper valve box, the valve body is internally provided with a main valve cavity, the main valve cavity is internally provided with an inner valve body, the inner valve body is internally provided with a negative pressure valve assembly, and the negative pressure valve assembly comprises a negative pressure valve seat, a negative pressure diaphragm, a negative pressure valve disc and a negative pressure valve rod; an upper diaphragm is arranged between the upper valve box and the valve body, a valve seat part is arranged at the upper end of the valve body, an anti-freezing solution is arranged in the upper valve box, and the upper diaphragm and the valve seat part are sealed under the gravity of the anti-freezing solution; through the synergistic effect of anti-freezing solution gravity sealing and hydraulic self-balancing design, compared with a traditional breather valve which depends on elastic elements such as a spring to maintain sealing pressure, the technical problems of sealing failure, complex mechanical structure, dynamic response lag and the like in a low-temperature environment are solved; high reliability, long service life and rapid pressure response of the breather valve are achieved, and the breather valve is particularly suitable for the extremely low-temperature working condition.