245 results about "Pressure Limit Valve" patented technology

The invention discloses a pressure-limiting valve seat, a pressure-limiting valve assembly, a valve group module and an air braking system. The pressure-limiting valve seat comprises a valve seat base body, and the valve seat base body is provided with a first valve cavity, a second valve cavity and a third valve cavity which are independent of one another; the brake cylinder interface and the sensing valve lower cavity interface are communicated with the first valve cavity, the pressure reduction air cylinder interface and the sensing valve upper cavity interface are communicated with the second valve cavity, and the control valve interface is communicated with the third valve cavity; the valve seat base body is further provided with a pressure limiting valve connector used for being connected with a pressure limiting valve, and the pressure limiting valve connector communicates with the first valve cavity, the second valve cavity and the third valve cavity in a one-to-one correspondence mode. The brake cylinder connector, the sensing valve lower cavity connector and one of the pressure limiting valve connectors communicate with the first valve cavity, so that when a corresponding valve port of the pressure limiting valve communicates with the pressure limiting valve connector, the pressure limiting valve can communicate with the brake cylinder connector and the sensing valve lower cavity connector at the same time through the first valve cavity; therefore, the pressure limiting valve can be communicated with the brake cylinder and the sensing valve lower cavity of the sensing valve at the same time.

The invention belongs to the technical field of lubricating oil processing, and particularly relates to lubricating oil hydrofining equipment which comprises a high-pressure tank, a high-pressure pump, an oil inlet pipe and a hydrogen inlet pipe. The output end of the oil inlet pipe and the output end of the hydrogen inlet pipe are both located on the lower portion of a hydrogenation cavity of the high-pressure tank, the spiral plate is installed in the middle of the hydrogenation cavity of the high-pressure tank, a hydrogenation catalyst is arranged on the surface of the spiral plate, and the permeable membrane separation barrel is installed on the upper portion of the hydrogenation cavity of the high-pressure tank; a permeable membrane for hydrogen and waste gas to enter is arranged on the outer wall of the permeable membrane separation barrel, the input end of the exhaust pipe extends into the permeable membrane separation barrel, the output end of the exhaust pipe is connected with the sucking pump, the input end of the oil outlet pipe extends into the upper part of the hydrogenation chamber of the high-pressure tank, and the output end of the oil outlet pipe is provided with a pressure limiting valve; hydrogenation mixing, hydrogenation refining and oil-gas separation are carried out in a high-temperature and high-pressure tank body, the integration level is high, the energy consumption is low, and the refining efficiency is high.

The embodiment of the utility model provides a cooking utensil, and belongs to the technical field of cooking, a working space is formed in the cooking container, and the working space comprises a cooking cavity, a mounting cavity, an exhaust cavity and an exhaust port, the pressure limiting valve is located in the working space, at least part of the pressure limiting valve is located in the mounting cavity, and the pressure limiting valve is used for communicating or cutting off the mounting cavity and the cooking cavity. At least part of the temperature measuring device is located in the exhaust cavity, fluid in the exhaust cavity flows to the exhaust port through the temperature measuring device, the arrangement direction of the pressure limiting valve and the temperature measuring device is a preset direction, and the exhaust cavity extends from the pressure limiting valve to the temperature measuring device in the preset direction. According to the cooking utensil, the accuracy of steam temperature measurement can be improved.

Diagnostic systems and methods utilize existing sensors on an engine and / or within a vehicle to detect and / or diagnose malfunctions or failures with an air pressure limiting valve. By analyzing and comparing in-vehicle and on-engine sensors data, as well as engine control maps, malfunctions and / or failures to the air pressure limiting valve and / or leaks in the air flow within the air pressure system are detectable.

A trailer control valve for controlling a hydraulic dual-line brake system of a trailer vehicle has an inlet for a hydraulic supply line of the towing vehicle, a tank outlet for an unpressurized return-flow line of the towing vehicle, a brake pressure outlet, and a supplemental pressure outlet. The brake pressure outlet can be connected in a stepped manner with an electronically controlled brake control valve to the supply pressure inlet or to the tank outlet. The supplemental pressure outlet can connect using a valve arrangement so that an outlet pressure of the supply pressure is reduced to a supplemental pressure at the supply pressure inlet or at the tank outlet. The valve arrangement has a pressure-limiting valve and a shut-off valve arranged in series. The shut-off valve can be a 3 / 2-way valve, which when not energized, the supplemental pressure outlet is connected to the tank outlet.

The application provides a cooking utensil, comprising: a utensil body having a cooking cavity; a cover body which is arranged on the utensil body and comprises a locked position locked on the utensil body and an unlocked position not locked on the utensil body, the cover body is provided with an exhaust passage communicated with the cooking cavity; a handle arranged on the cover body, the handle drives the cover body to rotate between the locked position and the unlocked position; a pressure limiting valve which blocks an exhaust port of the exhaust passage when the cover body is in the locked position; and a driving structure which drives the pressure limiting valve away from the exhaust port when the cover body is in the unlocked position. The technical scheme of the application can effectively solve the problem of poor safety of the cooking utensil in the related art.

The utility model provides a pressure cooker cover and a pressure cooker, and the pressure cooker cover comprises a cover body which is provided with an exhaust hole; the pressure limiting valve directly faces the exhaust hole and can slide in the axial direction of the exhaust hole so as to open or close the exhaust hole; the step seat is arranged above the cover body, and the height of the step seat is gradually increased or gradually decreased in the circumferential direction of the pressure limiting valve; the operating handle protrudes out of one side of the pressure limiting valve in the radial direction of the pressure limiting valve, and the operating handle can rotate around the axis of the exhaust hole and is in lap joint with the step base so that the exhaust hole can be kept in an open state. The exhaust speed of the pressure limiting valve can be controlled according to needs, liquid is prevented from overflowing in the exhaust process, and the use experience of the pressure cooker is improved.

The present application relates to the technical field of microneedle transdermal drug delivery, and particularly relates to a transdermal drug delivery patch and a penetration promoting patch assembly. The transdermal drug delivery patch comprises a driving device, the driving device comprises an elastic air bag, a pressure generating unit and a pressure limiting valve, the pressure generating unit is connected with the elastic air bag, is used for increasing the internal air pressure of the elastic air bag and making the elastic air bag expand, the pressure limiting valve is arranged on the elastic air bag, and is opened only when the air pressure in the elastic air bag exceeds a threshold value, is used for reducing the internal air pressure of the elastic air bag and making the elastic air bag shrink; the patch further comprises a dredging device, the dredging device comprises a substrate, one side surface of the substrate is in contact with the elastic air bag, and a dredging unit capable of treating the skin is arranged on the other side surface of the substrate; the dredging unit can repeatedly touch the skin in the process that the elastic air bag repeatedly expands and shrinks. The present application can effectively improve the absorption effect of the skin on active ingredients, and simultaneously reduce the operation and learning difficulty.

This application discloses an air suspension control system with a load connector, relating to the field of air suspension technology. By adding an external load interface and controlling the opening and closing of the air circuit through an electronically controlled pressure-limiting valve, it is possible to inflate an external load. The air suspension control system includes: an air supply valve unit, an air silencer filter dryer, an air tank, and multiple air springs. The air supply valve unit includes a manual vent bolt, an electronically controlled pressure-limiting valve, and a dryer tank. The air supply valve unit is equipped with a first air inlet, a second air inlet, a third air inlet, a fourth air inlet, and multiple fifth air inlets. The manual vent bolt is connected to the first air inlet, the electronically controlled pressure-limiting valve is connected to the second air inlet, and the dryer tank is connected to the third air inlet. The air inlet and outlet of the air silencer filter dryer are connected to the fourth air inlet. The air tank is connected to the dryer tank through the third air inlet. Each of the multiple air springs is connected to one of the multiple fifth air inlets.

The invention discloses a coal mine two-lane hydraulic support anti-impact stand column and a multi-stage pressure relief method of the coal mine two-lane hydraulic support anti-impact stand column. The anti-impact stand column comprises a first-stage cylinder, a second-stage cylinder, a movable column and an inner leakage plane pressure limiting valve. The first-stage cylinder is divided into two cavities by a valve seat plate arranged in the first-stage cylinder; a valve port is formed in the middle area of the valve seat plate; the inner leakage plane pressure limiting valve comprises a pressure limiting valve piston, a valve element and a first-stage elastic element. The pressure-limiting valve piston is connected with the inner wall of the upper cavity in a movable sealing fit manner, and a plurality of damping holes are formed in the pressure-limiting valve piston; the upper end of the valve core is connected with the pressure-limiting valve piston, and the lower end extends out of the valve port of the valve seat plate and closes / opens the valve port; the two ends of the first-stage elastic element make contact with the pressure limiting valve piston and the valve seat plate respectively. The cavity wall of the cavity C is provided with an upper cavity pressure relief opening, and the cavity B is provided with a lower cavity pressure relief opening. By assembling the internal leakage plane pressure limiting valve in the first-stage cylinder, the problems that an existing hydraulic support stand column is low in pressure relief response speed, seriously insufficient in pressure relief capacity and the like are solved.

A pressure limiting valve of a pressure cooker comprises an outer valve body and an inner valve body, the outer valve body comprises a first valve sleeve made of plastic and a second valve sleeve which is located in the first valve sleeve and made of metal, and the first valve sleeve and the second valve sleeve are integrated; a plurality of protruding adjusting feet are evenly distributed on the outer side face of the first valve sleeve and extend downwards to exceed the lower end face of the first valve sleeve. The inner valve body comprises a metal third valve sleeve sleeved in the second valve sleeve, the upper end of the third valve sleeve is provided with a plastic bonnet which is integrated with the third valve sleeve, the diameter of the bonnet is larger than that of the third valve sleeve, the bonnet is provided with an exhaust hole communicated with an inner cavity of the third valve sleeve, the back face of the bonnet is further provided with a sealing piece, and the sealing piece extends into the inner cavity of the third valve sleeve; the valve bonnet is located above the first valve sleeve and the second valve sleeve, an anti-disengaging clamping ring is arranged on the lower portion of the outer side face of the third valve sleeve, a step is formed by a concave portion of the lower portion of the inner side wall of the second valve sleeve, and the step of the second valve sleeve abuts against the anti-disengaging clamping ring in the free state.

The invention provides an independent modular structure of a railway wagon braking system and a mounting method, and belongs to the technical field of braking systems, the independent modular structure comprises a bottom plate, a 120 valve, an auxiliary air cylinder, a double-chamber air cylinder, a pressure limiting valve, a pneumatic passage device and a plurality of pipelines; the 120 valve, the auxiliary air cylinder, the double-chamber air cylinder, the pressure limiting valve and the pneumatic passage device are all installed on the bottom plate, and the pneumatic passage device is provided with two ventilation cavities, a penetrating channel and four connecting holes. The pressure limiting valve and the pneumatic passage device are fixedly installed, and the pressure limiting valve is communicated with one connecting hole and one end of the penetrating channel. The 120 valve is connected with the auxiliary air cylinder and the double-chamber air cylinder through pipelines, the 120 valve and the double-chamber air cylinder are communicated with one connecting hole and one penetrating channel through pipelines, and the 120 valve and the pressure limiting valve are communicated with the same ventilation cavity. According to the independent modular structure of the railway wagon braking system, multiple components are integrally arranged, pipeline cross interference and pipeline connecting length are reduced, and the response speed of the braking system is increased.

The present invention provides a commercial vehicle brake pedal force control system and vehicle, belonging to the field of vehicle development technology. The system includes: a brake pedal, a brake valve push rod, a brake valve, a rear air reservoir, a front air reservoir, a front circuit pressure-limiting valve, a rear circuit pressure-limiting valve, a front axle relay valve, and a rear axle relay valve. Compressed air in the front air reservoir enters the brake valve through the front circuit pressure-limiting valve and a first air inlet; compressed air in the rear air reservoir enters the brake valve through the rear circuit pressure-limiting valve and a second air inlet. When the brake pedal is depressed, the brake valve push rod moves, and the compressed air in the brake valve is discharged through the first and second air outlets to the rear axle relay valve and the front axle relay valve. When the brake pedal is returned, the brake valve push rod returns, and the compressed air in the brake valve is discharged through the first and second air outlets to the atmosphere. This invention reduces brake pedal force without changing the commercial vehicle assembly, reducing the design and manufacturing costs and difficulty of achieving brake pedal force reduction.

The invention discloses a failure opening type indirect action type gas pressure regulator, which relates to the technical field of gas pressure regulation, and comprises a main valve and a pilot valve, the top of the main valve is provided with a main valve upper cavity and a main valve lower cavity which are divided by a main valve diaphragm, and the main valve lower cavity is connected with a pressure release valve; the top end of the valve rod is connected with a main valve diaphragm, and the bottom end of the valve rod is connected with a main valve core; the pilot valve is provided with a main valve upper cavity connector and a main valve lower cavity connector which are communicated with a main valve upper cavity and a main valve lower cavity through pipelines respectively, the main valve upper cavity connector is communicated to a first-stage pressure limiting valve port, the main valve upper cavity connector is communicated with the main valve lower cavity connector through a second-stage pressure control valve port, and the main valve lower cavity connector is communicated with a rear pressure pipeline through a damping valve port. The opening degree of the secondary control pressure valve port and the damping valve port is controlled through an adjusting mechanism. The damping valve port is a variable damping valve port, the opening degree of the damping valve port can be adjusted through the balance of the pressure adjusting spring and the pressure of the medium gas, and the damping can be adjusted.

The application discloses a MGP packaging mold cake automatic discharging machine applied to the filtering field, and a dust removal box is fixedly connected to the outer end of the device body, and a dust suction pipe is fixedly connected to the top end of the dust removal box. Through the dust removal box, dust-containing gas is sent into a dust filter box by using a dust suction pump, is filtered through a rotating elastic dust filter screen, comes into an elastic sleeve, is gathered at the position, forces the elastic sleeve to gradually expand, and when the pressure threshold limit of a pressure limiting valve is reached, the elastic sleeve starts to contract, so that the elastic dust filter screen starts to reciprocate under the action of the elasticity, gives the dust an initial speed of moving to the right, at this time, water is squeezed out from the water-absorbing fiber under the extrusion of the movable plate, a large amount of water droplets are formed at the water outlet hole, the dust collides with the water droplets and adheres to the water droplets, and finally, under the action of gravity, the dust rolls down and is collected by the dust collecting box, and a series of work of shaking off, capturing and collecting the dust is completed.

The utility model relates to a pressure cooker cover, including the cover, button, transmission part and pressure limiting valve, the cover is provided with at least two accommodation cavities, the accommodation cavity is provided with the exhaust pipe, the pressure limiting valve is with the activity mode setting in the accommodation cavity, the pressure limiting valve is closed corresponding exhaust pipe under the action of gravity, the cover is provided with button accommodating cavity, the button is with the activity mode and places in button accommodating cavity, through setting at least two accommodation cavities and corresponding pressure limiting valve on the cover, and adopting button drive transmission part synchronous belt drive multiple pressure limiting valve to open exhaust pipe, make the steam in the pot can be discharged rapidly via multiple exhaust passages, not only significantly improved the pressure relief efficiency, shortened the cover opening waiting time, formed double pressure relief path simultaneously, still can pass through other passage safe pressure relief when one of exhaust passages is abnormal, effectively promoted the security and reliability in the use process.

The utility model discloses a riveting device for a pressure-limiting valve of a high-pressure oil rail assembly, which belongs to the technical field of assembly of automobile parts, is used for pressing a thin wall of the pressure-limiting valve, and comprises a driving mechanism and a riveting mechanism, the top of the pressure head assembly is in driving connection with the driving mechanism, and the pressure head assembly is arranged above the pressure limiting valve; the positioning mechanism is provided with a positioning hole, and the bottom of the pressure limiting valve is installed in the positioning hole; the pressing head assembly, the positioning mechanism and the pressure limiting valve are coaxial in the vertical direction, and the driving mechanism drives the pressing head assembly to move downwards to the to-be-pressed position of the pressure limiting valve to be pressed inwards. The thin wall machined by the riveting device has the advantages of high connection strength, vibration resistance, sealing consistency and the like after deformation, the debugging rejection rate of pressure-limiting valve parts is greatly reduced, the technological maturity of pressure-limiting valve products is improved, and the reliability and durability of the products are improved.

The invention relates to a hydrogen supply system for an internal combustion engine, comprising a high-pressure region (A) on the inlet side, a low-pressure region (C) on the outlet side, and a medium-pressure region (B) arranged fluidically between the high-pressure region (A) and the low-pressure region (C), a mechanical pressure reducing device (15) is provided for reducing a high pressure in the high-pressure region (A) to a medium pressure in the medium-pressure region (B), and wherein an electrically actuatable pressure reducing device (23) is provided for reducing a medium pressure in the medium-pressure region (B) to the low pressure in the low-pressure region (C). In this case, a pressure-limiting valve (17) is arranged in the medium-pressure region (B) and / or the low-pressure region (C) and a shut-off valve (22) is arranged downstream of the pressure-limiting valve. The hydrogen supply system according to the invention can in particular consist of only one hydrogen supply unit ("single cartridge solution").

A pneumatic system for a vehicle comprising an air compressor and a pressure circuit in fluid communication with the air compressor, the pressure circuit comprising a lower pressure branch and a high pressure branch in fluid communication with each other. The pneumatic system further comprises a controllable pressure limiting valve separating the low pressure branch from the high pressure branch.

The invention relates to a vehicle interior ventilation device (20) having a pressure-limiting valve assembly (21) and a frame-shaped component (22) for laterally delimiting the pressure-limiting valve assembly (21) and / or fixing the pressure-limiting valve assembly (21) in a receiving opening of a vehicle body component (30). In particular, according to the invention, the vehicle interior ventilation device (20) has a fan device (23) which is actuated or can be actuated as required.

The utility model discloses a kind of pressure-limiting valve and cooking utensil, belong to cooking utensil technical field, purpose is to overcome the defect that existing pressure-limiting valve is not easy to disassemble. Pressure-limiting valve includes valve body, the valve body has opening downward mounting groove, the inside wall of the valve body has assembly groove, the movable limit piece of assembly groove can be set, the convex part of the limit piece projects from the inside wall of the valve body, elastic member is equipped between the limit piece and the valve body, to make the limit piece tend to move to the mounting groove. The pre-pressure of elastic member is stronger controllability, facilitate the clamping force control of limit piece to exhaust pipe in reasonable range, avoid too loose or too tight, give consideration to connection stability and disassembly convenience.

The utility model provides a cover body assembly and a cooking utensil with the cover body assembly, and the cover body assembly comprises a cover body; the exhaust valve comprises an exhaust pipe penetrating through the cover body and a valve body arranged above the exhaust pipe, and the valve body has a pressure state for blocking an exhaust channel of the exhaust pipe and an exhaust state for avoiding the exhaust channel; the rotary driving part is arranged on the cover body and can drive the valve body to be switched between a pressure state and an exhaust state; the sliding part is movably arranged on the cover body in the preset linear direction, the rotary driving part is in driving fit with the sliding part so that the rotary driving part and the sliding part can move synchronously, and a first positioning part and a second positioning part are arranged on the sliding part at an interval; and the positioning piece is movably arranged on the cover body, and the positioning piece can be in positioning fit with the first positioning part and the second positioning part. According to the technical scheme, the problem that in the related technology, a user possibly touches the driving piece by mistake, so that the pressure limiting valve structure breaks away from the correct working state can be effectively solved.

This invention discloses a technical field of lubricating oil processing, particularly relating to a lubricating oil hydrorefining equipment, comprising a high-pressure tank, a high-pressure pump, an oil inlet pipe, and a hydrogen inlet pipe; it also includes a spiral plate, a permeate membrane separator, an exhaust pipe, a vacuum pump, and an oil outlet pipe. The output ends of the oil inlet pipe and the hydrogen inlet pipe are both located in the lower part of the hydrogenation chamber of the high-pressure tank. The spiral plate is installed in the middle of the hydrogenation chamber of the high-pressure tank, and a hydrogenation catalyst is disposed on the surface of the spiral plate. The permeate membrane separator is installed in the upper part of the hydrogenation chamber of the high-pressure tank, and a permeate membrane for hydrogen and waste gas to enter is disposed on the outer wall of the permeate membrane separator. The input end of the exhaust pipe extends into the interior of the permeate membrane separator, and the output end of the exhaust pipe is connected to the vacuum pump. The input end of the oil outlet pipe extends into the upper part of the hydrogenation chamber of the high-pressure tank, and a pressure limiting valve is disposed at the output end of the oil outlet pipe. Hydrogenation mixing, hydrogenation refining, and oil-gas separation are carried out in a high-temperature and high-pressure tank, with high integration, low energy consumption, and high refining efficiency.

The utility model provides a cover body assembly and a cooking utensil with the cover body assembly, and the cover body assembly comprises an inner cover which is rotatably arranged below an outer cover and is provided with a locking position enabling cover teeth to be buckled with pot teeth and an unlocking position enabling the cover teeth to be separated from the pot teeth; the driving piece drives the transmission piece to move relative to the outer cover, and the transmission piece drives the inner cover to rotate between the locking position and the unlocking position. The exhaust pipe penetrates through the outer cover and the inner cover, and the pressure limiting valve is arranged at the upper end of the exhaust pipe in a floatable mode. The cover body assembly further comprises a pushing part, the pushing part and the exhaust pipe are both arranged on the outer cover, the pushing part can move relative to the outer cover, when the transmission part drives the inner cover to rotate to the unlocking position, the transmission part drives the pushing part to jack the pressure limiting valve, and when the transmission part drives the inner cover to rotate to the locking position, the pushing part releases the pressure limiting valve. By means of the technical scheme, the problem that in the related technology, when the temperature in the pot body is high, the cover body assembly is not prone to being buckled on the pot body can be solved.

The utility model provides a pressure limiting valve, a pressure cooker cover and a pressure cooker. The pressure limiting valve comprises an exhaust pipe; the valve body is of a cavity-shaped structure with a downward opening, and the exhaust pipe is sleeved with the valve body; the valve element is located in the valve body, the valve element is arranged at the top of the exhaust pipe, and the valve element moves in the axial direction of the exhaust pipe so as to open or close the exhaust pipe; the pressure regulating piece is movably connected to the valve body, and the pressure regulating piece is provided with a first position and a second position; when the pressure regulating piece is located at the first position, the pressure regulating piece and the valve element are separated from each other, and the valve element moves independently. When the pressure regulating piece is located at the second position, the pressure regulating piece is connected with the valve element, and the valve body moves along with the valve element. The preset pressure of the pressure limiting valve can be adjusted according to needs, and various different cooking requirements are met.

The invention belongs to the technical field of petroleum well cementation simulation tests, and discloses a simulation experiment device and method for dynamic corrosion of carbon dioxide to well cementation cement stone. The simulation experiment device comprises a kettle body, a liquid carbon dioxide bottle and a carbon dioxide recovery bottle, the kettle body is provided with an upper end opening, a lower end opening and a containing cavity, the upper end opening and the lower end opening are communicated with the upper end and the lower end of the containing cavity respectively, and a test combination body is placed in the containing cavity. The test assembly comprises a rock core, and set cement and a sleeve which are sequentially arranged on the outer side of the rock core in a sleeving manner; the liquid carbon dioxide bottle is connected with the upper port through a liquid inlet pipe so as to inject liquid carbon dioxide into the containing cavity, and a booster pump is arranged on the liquid inlet pipe. The carbon dioxide recovery bottle is connected with the lower port through a liquid return pipe to recover liquid carbon dioxide, and a pressure limiting valve is arranged on the liquid return pipe. According to the invention, the flowing of carbon dioxide in the stratum and the corrosion simulation of the cement stone at the well cementation interface are realized, and the actual working condition that the cement stone is corroded by carbon dioxide under the stratum condition is more truly reduced.

The invention relates to a control device for hydraulic consumers, in particular for controlling the controlled inertial operation of at least one hydraulic rotary drive, for example a vibration motor (10) after shutdown thereof, comprising at least:-a corresponding hydraulic consumer,-a pressure balancing device (DW), and-a pressure limiting valve (DB), the pressure limiting valve acts on a control side (c) of the pressure balancing device (DW), and if a control pressure acting on another control side (d) of the pressure balancing device (DW) opposite the one control side (c), which is detected by a control connection (12) on the input connection (E), is greater than a control pressure applied on the one control side (c), the pressure limiting valve is actuated by the control connection (12) on the input connection (E). The invention relates to a pressure equalizing device which releases a fluid flow present at an input connection (E) thereof via an output connection (A) in the direction of a low-pressure side (3), such as a tank (T).

The utility model discloses an oil pump pressure-limiting valve capable of preventing eccentric wear of a plunger, and relates to the technical field of pressure-limiting valves. The utility model discloses an installation plate, the obverse side of the installation plate is fixedly connected with a valve body, the right side of the valve body is provided with an oil outlet, the left side of the valve body is provided with a rotating handle, the top of the valve body is fixedly connected with an oil drainage pipe, the inside of the valve body is respectively provided with a flow cavity, a concentration cavity and a diversion trench, and the left side of the valve body is provided with an oil inlet. By arranging the oil drainage assembly, specifically, when the pressure of lubricating oil at the oil outlet is still large, the lubricating oil flows to the bottom of the movable rod through the flow guide groove and then enters the concentration cavity through the conveying hole and the circulation hole, the lubricating oil pushes the conical block to the left side through the center hole, and the lubricating oil smoothly flows into the left side of the fixing ring; and the oil is discharged through the oil drainage pipe at the top for oil drainage, so that the outflow pressure of the lubricating oil is more uniform, the condition of eccentric wear caused by applying larger pressure to one side of the plunger is avoided, the wear is reduced, and the service life is prolonged.