43 results about "Direct acting" patented technology

This utility model relates to the field of horizontal jack manufacturing technology, and in particular to a differential pressure balanced oil discharge valve, a control valve assembly, and an electric pump station. The differential pressure balanced oil discharge valve is the core component for achieving smooth jack descent, and includes a valve body, a valve core assembly, a pressure balancing mechanism, and a drive assembly. The valve body has a first oil passage and a second oil passage; the inner valve core of the valve core assembly has a pressure balancing channel, and an elastic reset element provides initial sealing pre-tightening force; the pressure balancing mechanism seals the pressure balancing channel through a sealing body. The drive assembly employs a two-stage control: the first stage pushes the pusher to open the sealing body, initially connecting the first and second oil passages, balancing the oil pressure, and reducing the pressure difference of the inner valve core; the second stage directly acts on the inner valve core, causing it to overcome the pre-tightening force to fully connect the first and second oil passages, achieving smooth hydraulic oil return, ensuring stable and vibration-free jack descent, while reducing operating force and improving safety and convenience.

The utility model discloses a gas cylinder, relates to high pressure gas cylinder technical field, including bottle body, bottle body also includes bottle mouth, bottle shoulder, bottle body, bottle bottom and seal cover, seal cover and bottle mouth inner wall threaded connection, the inner wall of bottle body is fixed with the elastic lining, the elastic lining is provided along the inner wall circumference of bottle body, and the elastic lining is provided with the elastic lining. A buffer component is arranged in the bottle bottom, at least part of buffer space is arranged between the buffer component and the bottle bottom, the elastic lining and the buffer component are arranged, the elastic lining is arranged on the inner wall of the bottle body, when the pressure intensity in the bottle is increased, pressure generated by the internal pressure intensity acts on the elastic lining, and the buffer space is formed between the buffer component and the bottle bottom. And correspondingly, when the air pressure in the cylinder is increased, the internal pressure can also act on the buffering component, and the internal pressure can absorb part of the pressure through buffering of the buffering component, so that the internal high-pressure resistance of the gas cylinder is improved, and the safety of the gas cylinder is improved.

The utility model discloses an electric ball valve with a flow pressure regulating function, which relates to the field of electric ball valves and comprises a valve body, an electric actuator shell is mounted at the top of the valve body through a mounting support, an electric actuating mechanism inside the electric actuator shell is coaxially connected with an O-shaped ball valve through a valve rod, and the O-shaped ball valve is mounted on the valve body. The O-shaped ball valve is located in the valve body, a straight pipe is installed in the water inlet end of the valve body, a connecting pipe penetrating into the valve body is welded to the outer wall of the water inlet end of the valve body, the straight pipe and the connecting pipe are distributed in a T shape, an inner cavity of the straight pipe is communicated with an inner cavity of the connecting pipe, and the straight pipe is connected with the connecting pipe. The output end of the straight pipe is rotationally connected with an anti-reverse plate through a reset mechanism. According to the O-shaped ball valve, the straight pipe, the anti-reverse plate and the reset mechanism are arranged, so that in the adjusting process of the O-shaped ball valve, generated turbulent flow cannot directly act on the sensing end of the piezoelectric pressure sensor, and the purpose of more efficient adjustment is achieved.

The utility model discloses a high-strength wear-resistant material low-resistance valve, which particularly relates to the technical field of valves, and comprises a valve body, a valve cavity is arranged in the middle of the valve body, sealing rings are symmetrically embedded on two sides of an inner cavity of the valve cavity, a valve core is arranged in the middle of the valve cavity, and the top of the valve core is fixedly connected with a valve rod. By means of the speed reduction groove, when liquid is about to enter the valve body, the impact force of water flow can be reduced by increasing the passing area of the water flow, the impact force of the water flow can act on the wear-resistant ring through the wear-resistant ring, the wear resistance of the valve body is improved through the wear-resistant ring, and the service life of the valve body is prolonged. The impact force of liquid is prevented from directly acting on the valve element, the protection effect on the valve element is achieved, meanwhile, speed-reduced water flow can be gathered through the wear-resisting ring, the speed of the water flow is recovered, impact force cannot be generated on the valve element, the service life of the valve element is prolonged, abrasion of the valve body and the valve element is avoided, resistance cannot be generated on the water flow, and the service life of the valve element is prolonged. And the effect of low resistance is achieved.

The utility model belongs to the technical field of protective sleeve device, especially a valve body protection device convenient to installation, including valve body and the protective shell of setting in the valve body outside, the protective shell includes setting in the first shell and the second shell of valve body outer wall and symmetrical setting, in the utility model, through the connecting assembly of design, the quick splicing and the fixed of first shell and second shell have been realized, need not to help additional tool, can complete fast through the manual operation, has improved the installation efficiency, has guaranteed the stability of connection simultaneously, thereby has promoted the installation convenience and use security of valve body protection device, besides, through setting the top cap and support frame, further enhanced the protection performance of valve body protection device, effectively blocked the direct action of sunshine, rain and other environmental factors to valve body, prolonged the service life of valve body protection device and valve body.

The direct acting type double-diameter piston type pressure reducing valve comprises a valve body, a double-diameter piston is installed at one end of the valve body, a sensitive compensation hole with the two ends different in diameter is formed in the large-diameter piston in the double-diameter piston, and a discharging hole penetrating through the double-diameter piston is further transversely formed in the double-diameter piston. The discharging hole enables the pressure reducing valve to have a self-discharging function; one end of the double-diameter piston is inserted into a center hole of the check ring, and the check ring and one end of the valve body form an edge sealing structure. A spring extrusion assembly is arranged on the peripheral face of one end of the valve body and used for adjusting spring force to extrude the double-diameter piston. Through the spherical sealing of the alloy valve clack and the movable throttling valve seat and the metal spherical sealing of the top end of the metal valve clack and the piston discharge hole, the sealing performance and the use durability of the pressure reducing valve are greatly improved.

The direct drive device (10) has a bearing (14) fitted to the outer periphery of a ball screw (12), a nut holder (30) through which the ball screw (12) is inserted, and a bearing pressing member (22) fixed to a motor housing (16) in a state where the ball screw (12) is inserted into a through hole (36), which restricts the axial movement of the bearing (14) in the motor housing (16), the bearing pressing member (22) having a cutout portion (40) extending radially from the inner peripheral surface of the through hole (36) to the outer peripheral surface of the bearing pressing member (22).

A dual distributor comprising two pumps (P1, P2), namely: - a first pump (P1) provided with a first actuating rod (P11) axially movable over a first maximum stroke, and - a second pump (P2) provided with a second actuating rod (P21) axially movable over a second maximum stroke, the distributor comprising a common plunger (B) axially movable and acting axially and directly on the first actuating rod (P11) to drive it over its first maximum stroke, characterized in that: - the first maximum stroke is greater than the second maximum stroke,and - the distributor further includes reduced-speed transmission means (1) acting between the common pusher (B) and the second actuating rod (P21) to transmit the axial thrust force of the common pusher (B) to the second actuating rod (P21) with a reduced speed of the second actuating rod (P21) relative to that of the first actuating rod (P11). "Figure for the abbreviation: Figure 1",

1. The name of the design product: Direct-acting valve (FS-9D). 2. The use of the design product: Mainly used for electromagnetic valve for controlling water flow. 3. The design points of the design product: In shape. 4. The picture or photo that best indicates the design points: Perspective view 1.

The check valve comprises a hollow valve seat, the bottom of the valve seat is provided with an opening, the top of the valve seat is provided with a supporting rod in a protruding mode in the axial direction of the valve seat, the supporting rod and the valve seat are coaxial, the top of the supporting rod is further coaxially provided with a valve element blocking piece, the valve element blocking piece extends in the circumferential direction of the supporting rod, and the valve element blocking piece extends in the circumferential direction of the supporting rod. A second liquid outlet is formed in the upper surface of the valve seat, the second liquid outlet is communicated with an opening in the bottom of the valve seat, and the valve seat, the supporting rod and the valve element blocking piece are integrally formed. According to the scheme, the check valve is of an integrally-formed structure, does not need to be disassembled or assembled and is convenient to install and clean, through cooperation of the check valve and the three-way piece, the vacuumizing space of the breast pump can be reduced, vacuum negative pressure directly acts on the breast pumping cover connected with the first connector, the pumping time of each time is shortened, and the pumping efficiency of the breast pump is improved.

To provide a direct acting damper capable of improving performance against speed dependence.SOLUTION: A cylinder 3 for forming a pressure chamber 11, a piston 5 which is mounted in the cylinder 3 to partition the pressure chamber 11 and is movable forward and backward between the partitioned pressure chamber 11 and a non-pressure chamber 13, a piston rod 7 which is provided coaxially with the piston 5 and protrudes to the outside of the cylinder 3 to interlock with the forward and backward movement, a seal member 9 which seals between the cylinder 3 and the piston 5, and a circumferential seal attachment portion 23 which supports the seal member 9 and interlocks with the forward and backward movement of the piston 5; A flow passage part 3a in the peripheral direction to an inner peripheral surface 9a of a cylinder 3 arranged on the outer periphery of a seal member 9 or a flow passage part 9a in the peripheral direction between the seal member 9 and a seal installing part 23 and an orifice 9a for penetrating the flow passage part 9b to a pressure chamber 11 and a non-pressure chamber 13 are provided. Vis.SELECTED DRAWING: Figure 1

1. The name of the design product: diaphragm direct-acting electromagnetic valve. 2. The use of the design product: used for driving the valve core to act by electromagnetic force, realizing the on-off of fluid or the switching of pipeline, used in the field of fluid or gas control. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: design 1 perspective view. 5. Design 1 is specified as the basic design.

The invention relates to the technical field of swing oil cylinders, in particular to a swing oil cylinder which comprises a cylinder body, an end cover and a piston and is further provided with a first locking nut, the first locking nut is fixedly connected with the cylinder body and transmits hydraulic pressure borne by an output shaft body to the cylinder body, and the end cover is fixedly connected with the cylinder body. The counter-acting force of the hydraulic force for pushing the piston to move towards the first cavity is transmitted to the cylinder body, the hydraulic force for pushing the piston to reciprocate does not directly act on the output shaft body under the combined action of the two, and the situation that the counter-acting force of the hydraulic force for pushing the piston to reciprocate is transmitted to the thrust gasket or the needle bearing by the output shaft body is avoided. The thrust gasket or the needle bearing rotates and rubs under the condition that the thrust gasket or the needle bearing bears huge hydraulic pressure and is quickly abraded or damaged, so that a tandem shaft fault is caused, and the service life of a thrust component is prolonged.

An electric brake booster (100) controls a master cylinder (101) from the brake pedal (103), which acts on the control pin (102) and the plunger piston (8) for emergency braking, to act directly on the reaction disk (72) and the pushrod (7). The auxiliary piston (6) is normally driven by the actuating piston (4), which in turn is driven by the electric motor via racks (3, 3') and pinions (2, 2'). The auxiliary piston (6) can move freely forward relative to the actuating piston (4) by means of an intermediate sleeve (5) and the insertion of an intermediate spring (53), which exclusively ensures the return of the pushrod (7) after brake application, without initially having to push the return spring (41). If the emergency braking effect on the brake pedal (103) continues, the force only needs to overcome the force built up by the return spring (41) after the compression of the spring (53).

The invention discloses a multifunctional stoma protection drainage device, and relates to the technical field of medical machinery, the multifunctional stoma protection drainage device comprises a protection base and a connecting waistband, the bottom of the inner cavity of the protection base is provided with rotating grooves distributed in an array, the interiors of the rotating grooves are rotatably connected with driven rollers, and the inner cavity of the protection base is provided with a self-adaptive assembly. When a patient wears the stoma protection device to move, shaking of the body of the patient can drive a driven roller on the temporal portion of a rotating groove in the bottom of a protection base to rotate, and the driven roller drives a driven column and a rotating column to rotate through a transmission belt while rotating; a first gear and a second gear, fixedly connected with one end of a driven column, of a rotating column rotate in rack sets on the two sides of a fixed frame, third gears arranged on the two sides of a protection block also rotate in the rack sets at the same time, and when a driven roller rotates under external force, the protection block can adjust protection on a stoma flow guide pipe along with rotation of a rotating roller; and external force is prevented from directly acting on the stoma diversion tube.

Diaphragm valve with a diaphragm (5) that seals between chambers, wherein the diaphragm (5) is arranged between an upper part (7) and a lower part (1). The diaphragm valve has a clamping arrangement (14) in which the diaphragm (5) is held directly between the upper part (7) and the lower part (1). The diaphragm valve has a sealing arrangement (16) in which the upper part (7) acts directly on a spring device (15), wherein the spring device (15) presses the diaphragm (5) directly against the lower part (1) with a pressure of more than 3 N / mm². 2 presses.

The high-precision plunger type direct-acting pump comprises a cavity, a plunger assembly and a driving assembly, the cavity is provided with a first liquid inlet channel, a first liquid outlet channel, a first mounting groove and a connecting channel, the first mounting groove communicates with the connecting channel through a plunger moving groove, and the plunger assembly comprises a positioning ring and a plunger rod. A sealing assembly is arranged between the periphery of the plunger rod and the plunger moving groove; the input end of the first liquid inlet channel is provided with a pressure supplementing connector. An exhaust structure is arranged at the position, corresponding to the connecting channel, of the plunger moving groove. The sealing assembly comprises an O-shaped ring, a sealing ring and a block-up ring, and the block-up ring and the O-shaped ring are sequentially arranged on the periphery of the first annular extending part in a sleeving mode. The pressure supplementing connector plays a role in reducing the pressure difference between the interior and the exterior of the cavity, cavitation is reduced, the exhaust structure is arranged, air in the plunger moving groove can be smoothly exhausted into the connecting channel through the exhaust structure, and the heightening ring can fully guarantee that the O-shaped ring can tightly hold the first annular extending part.

The utility model discloses a vertical hydraulic clamp, include: circular base, annular cylinder wall, vertical clamping mechanism and hydraulic distribution valve, circular base is installed in the rotary workbench, and annular cylinder wall is ringed in circular base, annular cylinder wall and circular base surround and set up clamping work cavity, the rotary workbench can make circular base and annular cylinder wall rotating activity, annular cylinder wall is provided with the vertical mounting plate of the board piece, vertical clamping mechanism and hydraulic distribution valve are installed in vertical mounting plate, vertical clamping mechanism includes a plurality of hydraulic clamping subassembly connected with hydraulic distribution valve, the utility model discloses, and the clamp whole is directly installed on the rotary workbench through circular base, can realize the synchronous rotation of workpiece and clamp under the clamping state, the design makes the hydraulic clamping force direct action on the vertical or inclined facade of workpiece, and the vertical posture of perfect adaptation large -scale workpiece is placed, and the rigidity and the anti -vibration of clamping under the strong cutting working condition are ensured.

The invention relates to the technical field of grouting recoil force control, in particular to an upward grouting stability control system and method.The upward grouting stability control system based on reactive force monitoring comprises a grouting structure and a supporting and stabilizing structure, the grouting structure comprises a grouting anchor rod, and the supporting and stabilizing structure comprises a supporting and stabilizing structure; the output end of the grouting anchor rod can penetrate into a stratum needing to be grouted, the bottom end of the grouting anchor rod communicates with and is fixedly connected with a sleeve, the inner side of the sleeve is slidably connected with a piston ring, a hole is formed in the center of the piston ring, the bottom end of the piston ring communicates with a grouting pipe, and the lower side of the piston ring, the outer side of the grouting pipe and the inner side of the sleeve are air cavities. The sliding piston ring and the grouting pipe are arranged, a part of buffer space can be reserved, the yielding effect is achieved, grout is pressed into the inner side of a stratum through the grouting pipe, the sleeve and the grouting anchor rod, and under the effect of grouting pressure, the grouting pipe can move downwards instead of directly acting and transmitting to an existing hard supporting structure.

Diaphragm valve with a diaphragm (5) that seals between chambers, wherein the diaphragm (5) is arranged between an upper part (7) and a lower part (1). The diaphragm valve has a clamping arrangement (14) in which the diaphragm (5) is held directly between the upper part (7) and the lower part (1). The diaphragm valve has a sealing arrangement in which the upper part (7) acts directly on a spring device (15), wherein the spring device (15) presses the diaphragm (5) directly against the lower part (1) with a pressure of more than 3 N / mm².

The application relates to the technical field of range commanders, in particular to a self-operated ultra-micro pressure range commander and a use method, which comprises a cylinder body, a float is arranged in the cylinder body, a top cover is arranged on the upper end of the cylinder body, a bottom cover is arranged on the lower end of the cylinder body, a plurality of air vents are arranged at the same horizontal height position of the middle part of the outer wall of the cylinder body, a valve three-way pipe, a valve two-way pipe and a valve one-way pipe are sequentially arranged on the upper part of the outer wall of the cylinder body from top to bottom, a first sealing ring and a second sealing ring are respectively formed on the upper end of the outer wall of the float, the first sealing ring and the second sealing ring form a sealing area on the upper end of the outer wall of the float, a plurality of air holes penetrating through the side wall of the float are arranged on the center line of the sealing area, and the other end of the air inlet pipe is connected with a controlled gas phase source. The application solves the adverse effect caused by the direct action of the controlled gas on the self-operated micro pressure valve diaphragm, and eliminates the cross operation of a plurality of self-operated micro pressure valves.

This invention discloses a magnetorheological damper for reducing the piston rod push-out force, relating to the field of magnetorheological damping technology. It includes an outer cylinder and an oil reservoir coaxially sleeved inside the outer cylinder, forming an annular flow channel between the outer cylinder and the oil reservoir. Inside the oil reservoir, from top to bottom, are arranged an upper guide assembly, a piston rod assembly, a shut-off valve assembly, and a floating piston assembly. This invention solves the problem of excessive piston rod push-out force in traditional single-cylinder magnetorheological dampers by placing a shut-off valve assembly in the lower section of the oil reservoir, thus dividing the single working chamber of the traditional single-cylinder magnetorheological damper into three independent chambers: an upper chamber, a lower chamber, and a lower-lower chamber. During compression and extension strokes, the maximum damping force is mainly borne by the shut-off valve assembly, rather than directly acting on the floating piston. This allows the floating piston assembly to only compensate for piston rod volume changes without providing high-pressure support.

The utility model relates to the technical field of fireproof valves, and discloses a ventilation fireproof valve for rail transit, which comprises a valve body, an actuating mechanism is arranged at the top end of the valve body, a blade is fixedly connected to the middle of the actuating mechanism, and the actuating mechanism comprises a rod assembly and a shell. A linkage assembly, a reinforcing assembly and an automatic closing assembly are arranged in the shell, the reinforcing assembly comprises a fixing sleeve fixedly connected to the side face of the long rod, a reinforcing ring is fixedly connected to the side face of the fixing sleeve, a connecting rod is fixedly connected to the bottom end of the reinforcing ring, and a rotating ring is fixedly connected to the bottom end of the connecting rod; the bottom end of the rotating ring is fixedly connected with a reinforcing rod, the reinforcing assembly is arranged, the lower portion of the reinforcing rod is fixedly connected with two sets of stop blocks, the sides, close to the blades, of the stop blocks are fixedly connected with blocking pieces, the blocking pieces directly act on the blades from the two sides, the effect of reinforcing the blades is achieved, the blades can better resist wind resistance, and opening and closing of the blades are more stable.

The direct acting type underground pressure regulating device comprises a base, a cutting box, a pressure regulating box, an upper sealing plate and a protection box, the cutting box is divided into a first upper cavity and a first lower cavity through a first partition plate, an air inlet pipe is arranged on the left side of the cutting box, and the pressure regulating box is divided into a second upper cavity and a second lower cavity through a second partition plate; a communicating pipe communicating the first upper cavity and the second upper cavity is fixed between the first partition plate and the second partition plate, the end, located in the first upper cavity, of the communicating pipe is a cut-off valve port, vent holes distributed in the circumferential direction are formed in the first partition plate, and a valve seat is arranged on the second partition plate. A pressure regulating valve port communicated with the second upper cavity and the second lower cavity is formed in the top of the valve seat, a cut-off valve and a pressure regulator corresponding to the cut-off box and the pressure regulating box are installed on the upper sealing plate, the cut-off valve is provided with a cut-off valve clack matched with the cut-off valve port, and the pressure regulator is provided with a pressure regulating valve clack matched with the pressure regulating valve port. The device has the advantages of simple structure, low cost, stability and reliability.

The utility model discloses a small bistable pulse electromagnetic valve, which comprises a valve body, an electromagnetic driving mechanism and a water retaining disc assembly, an inlet channel, a valve cavity and an outlet channel are arranged in the valve body, a water sealing seat is arranged in the valve body, the water retaining disc assembly is arranged in the valve cavity and used for controlling the on-off of the water sealing seat, and the valve cavity is divided into an upper cavity and a lower cavity by the water retaining disc assembly. The water retaining disc assembly comprises a membrane and a water retaining disc, and a through hole is formed in the water retaining disc; a plurality of overflowing holes are formed in the valve seat, the outer circumferential face of the valve seat is tightly attached to the inner circumferential face of the valve cavity, a pressure relief channel is formed between the valve seat and the valve cavity, a middle hole communicated with one end of the pressure relief channel is formed in the middle of the upper end of the valve seat, and the other end of the pressure relief channel is communicated with the outlet channel. The electromagnetic driving mechanism is matched with the valve seat to achieve opening and closing of the pressure relief channel. The electromagnetic valve is smaller in structural size, the switch directly acts on the middle hole of the valve seat, the size affected by parts is smaller and easier to control, the pressure relief opening is directly designed in the cavity of the electromagnetic valve, and the sealing performance is better.

The invention discloses a pressure regulator with a linkage cylinder valve cut-off function. The pressure regulator comprises a valve body, a pressure regulating assembly, a cut-off assembly and a detection assembly. The pressure adjusting assembly is used for dividing the interior of the valve body into a pressure adjusting cavity and a valve cavity and adjusting the gas pressure. The cut-off assembly comprises a reciprocating driving unit and a cut-off unit, the reciprocating driving unit drives a cut-off sliding block to ascend and descend in a reciprocating mode through an electromagnetic chuck, then the cut-off unit is driven to directly act on the self-closing end of the cylinder valve, and opening and closing of the cylinder valve are achieved. The cylinder valve connecting part is used for tight connection and sealing between the pressure regulator and the cylinder valve; and the detection assembly is installed in the valve cavity and used for monitoring the leakage condition and the on-off state of the pressure regulator in real time and feeding signals back to the control unit to form closed-loop control, and through the linkage design of the cut-off assembly and the detection assembly, the use safety and convenience of the pressure regulator are effectively improved.

The remote-operated system (100) for automatically regulating pressure between an upstream gas pipe (101) and a downstream gas pipe (102) comprises: - a controlled regulator (105), connected, on the one hand, to the upstream gas pipe and, on the other hand, to the downstream gas pipe, - a control mechanism (110) for controlling the controlled regulator, - at least two direct-acting regulators (130, 135) each configured to produce a drive pressure as a function of a predetermined control pressure, at least two control pressures being different, - a drive pipe (115) connecting at least two said direct-acting regulators and the control mechanism of the controlled regulator, and - a remote-operated mechanism (160) for selecting the control pressure to be implemented and configured to pneumatically activate the direct-acting regulator corresponding to the control pipe selected.

The utility model discloses a pull-type reset flushing and filling valve which comprises a valve body, a valve element is arranged in the valve body, the valve body and the valve element are connected in a sealed mode through a sealing piece, a spring is arranged on the outer side of the rear end of the valve element in a sleeved mode, a plurality of guide sliding blocks are arranged on the outer side of the front end of the valve element in an annular array mode, and the guide sliding blocks are connected with the inner wall of the valve body in a sliding mode. The valve core is designed with a guide matching structure, a conical spring elastic traction mode is adopted for resetting, guide and traction double insurance is realized to ensure that the valve core does not deflect in the resetting process, meanwhile, the valve core is designed with a guide taper, and a valve body sealing surface inlet is also designed with a guide taper to ensure that the valve core can be smoothly reset under any condition; meanwhile, one end of the spring is positioned by a step of the valve body, the other end directly acts on the valve core, excessive conversion of middle parts is avoided, and the spring is prevented from being installed obliquely to the greatest extent; moreover, the design scheme without a positioning piece is adopted, so that the hidden danger of rusting of the positioning piece is completely eradicated.

The utility model provides a valve locking device, which belongs to the technical field of valves and comprises a valve body and a rotatable handle at the top of the valve body, one end of the handle is provided with a valve body limiting bump, the top of the valve body is provided with a closing limiting block and an opening limiting block corresponding to the valve body limiting bump, and one side of the valve body limiting bump is provided with a locking component; the locking assembly comprises a locking rod, a mounting groove is formed in one side of the limiting protruding block of the valve body, the locking rod is arranged in the mounting groove in a sliding mode, limiting plates are arranged on the adjacent sides of the closing limiting block and the opening limiting block, locking holes are formed in the positions, corresponding to the locking rod, of the tops of the limiting plates, and the bottom end of the locking rod is arranged in one set of locking holes in a penetrating mode. The handle is locked through the locking device; compared with a traditional external lock chain or padlock, the built-in locking structure directly acts on a valve operation part, the loosening risk caused by vibration, collision or manual mistaken touch is avoided, it is ensured that the valve is kept in a stable state in the scene needing to be normally opened or normally closed, and stability is improved.