41results about How to "Short opening and closing time" patented technology

The invention provides an ultra-clean proportional valve. The ultra-clean proportional valve is provided with an ultra-clean flow chamber, a magnetic driving assembly is arranged in the mode that an embedded permanent magnet and an external control permanent magnet are matched, a valve port is opened and closed based on the minimum magnetic resistance principle, and the position of the valve portcan be precisely controlled; the actuating distance of the magnetic driving assembly is small, the opening and closing time of the valve port is shortened, and the response speed is high; driving force in two directions can be applied to a valve element, and the problem that the reliability is poor when the valve element is opened depending on fluid impact force is solved; and magnetic induction lines of the magnetic field form a closed loop, the interference in the external space of the magnetic field is small, and the influence of magnets in the environment on the valve is avoided.

The invention relates to a middle open type translation double-sealed rectangular gate valve. A right valve plate and a left valve plate which are opened or closed through rectangular frames are installed in a rectangular valve body, and the right and left valve plates are driven to move by a driving device installed on the valve body, and limited by shifting forks at the tops and bottoms of the right and left valve plates and limit rollers; and flow channel compensation is performed by virtue of a flow channel compensation device installed on the edge of an inner cavity of the valve body and flow channel compensation pieces connected to the flow compensation device, while a front sealing ring and a rear sealing ring of the inner cavity of the valve body as well as the front and rear sealing rings in the closure position of the right and left valve plates constitute bidirectional sealing. The rectangular gate valve provided by the invention is a valve with large size and zero leakage, the flow channel clearance is smaller than 5 mm, and the valve is applicable for working conditions of high flow rate and strong vibration.

The invention provides a method for pressure testing of an overboard discharge pipe, and the method comprises the following steps: installing a stopper at an opened end of the overboard discharge pipe, wherein the stopper is detachably connected with the overboard discharge pipe; injecting compressed air into the stopper, so as to block the opened end of the overboard discharge pipe; connecting a first pressure meter assembly at a flange end of the overboard discharge pipe; letting compressed air into the overboard discharge pipe through the first pressure meter assembly, and detecting the airtightness of the first pressure meter assembly. The method can achieve the quick testing of the airtightness of the overboard discharge pipe, is very simple in operation, is higher in efficiency, saves the materials, and is lower in cost.

The invention discloses a built-in bottom-valve-free LNG pump well structure, and belongs to the field of LNG pump wells. The built-in bottom-valve-free LNG pump well structure comprises a pump well arranged in a storage tank. An immersed pump is arranged in the pump well, and a liquid inlet cavity is formed between the inlet end of the immersed pump and the bottom end of the pump well. A plurality of pipelines stretching out of the storage tank are arranged on the pump well. One end of each pipeline is communicated with the liquid inlet cavity, and the other end of each pipeline is communicated with the interior of the storage tank from the exterior of the storage tank. A plurality of stop valves are arranged on the parts, located on the outer portion of the storage tank, of the pipelines. The built-in bottom-valve-free LNG pump well structure has the beneficial effects that the structure is simple, and implementation and mounting are easy and convenient; the immersed pump can be maintained at any time, and the valves for controlling communication between the storage tank and the pump well can be maintained at any time; and LNG waste is greatly reduced, and no threat to the safety of maintenance personnel exists.

The invention discloses a horizontal type vulcanizing tank with vertical doubly-opened door panels being opened and closed in a lifting mode. The horizontal type vulcanizing tank comprises a horizontally placed barrel body and the door panels arranged at the two ends of the barrel body. Portal frames are arranged at the two ends of the barrel body. Lifting slide rods are arranged at the left side and the right side of each portal frame. Door panel supports transversely extending towards the lifting slide rods are arranged at the upper side and the lower side of each door panel respectively. The door panel supports are provided with slide rod bearings which are arranged on the lifting slide rods in sliding and sleeving modes. Hydraulic oil cylinders are vertically mounted at the left side and the right side of a bottom plate of each portal frame. The driving ends of the hydraulic oil cylinders and the door panel supports at the upper sides of the door panels are fixed. The door panels are opened and closed in the vertical lifting mode, the door opening and closing time is short, operation is safe and reliable, and the service cycle of sealing pieces can reach one or more years; the door panels move along the lifting slide rods and are driven by the hydraulic oil cylinders, in work, switching between opening and closing of doors can be achieved only by controlling actions of the hydraulic oil cylinders, the process can be intelligently controlled through a computer, and a high-end product is achieved.

The invention discloses a valve wheel rotary device and belongs to the technical field of valve control. The valve wheel rotary device comprises a rotary bracket (100), at least two clamping mechanisms (200) and an electric driving mechanism (300); one end of each of the clamping mechanisms (200) is connected with the rotary bracket (100); all clamping mechanisms (200) are distributed at intervalsin the circumferential direction of the rotary bracket (100) and can be fixed with a valve wheel; the electric driving mechanism (300) is connected with the rotary bracket (100) and drives the clamping mechanisms (200) to rotate through the rotary bracket (100). According to the scheme, the problem that the current valve on-off control manner wastes time and labor is solved.

The invention discloses a large workpiece heating furnace which comprises multiple circulating fans. An air outlet at the furnace top is arranged to face the inner side of a furnace body. A gas circulating flow guide system is arranged between the furnace body and an inner hearth and comprises multiple arc flow guide plates, one end of each arc flow guide plate is arranged in an air outlet of thecorresponding circulating fan, and the other ends of the arc flow guide plates stretch out of the air outlets to be vertically arranged at intervals. The air outlets are divided by the arc flow guideplates into multiple branch air outlets, and the branch air outlets gradually become winder from the air outlet sides to the outside. Vertical first straight flow guide plates and second straight flowguide plates are connected with the two sides of the air outlets of the circulating fans respectively and meanwhile are connected with the inner side face of the furnace body and the outer side faceof the inner hearth, and multiple vertical air flues are formed by the inner side face of the furnace body, the outer side face of the inner hearth, the first straight flow guide plates and the secondstraight flow guide plates. Through the gas circulating flow guide system, gas in the furnace body is heated evenly, so that the temperature of gas entering the inner hearth is consistent, and workpieces are heated evenly.

The invention provides a valve. The valve comprises a valve body, a pair of valve plates, a driving mechanism and a moving piece, wherein the valve body is provided with a front channel, a rear channel and a valve cavity; the front channel communicates with the rear channel by the valve cavity; the pair of valve plates is positioned in the valve body and is pivotally connected to a fixing plate ofthe valve body; the driving mechanism comprises a cylinder and a pair of guide columns; the cylinder is fixed on the valve body; the pair of guide columns is movably arranged on a top cover of the valve body; the upper parts of the pair of guide columns are separately connected with an extension shaft of the cylinder; and the moving piece is fixedly mounted on the lower parts of the pair of guidecolumns and is in contact with the pair of valve plates. The valve is novel in structure; and during working, an operator enables the cylinder to work so as to drive the moving piece to move vertically, and then the valve plates are driven to rotate around a hinged shaft to open and close a valve opening. Therefore, the valve has the advantages of simplicity in operation, short opening and closing time, capability of controlling the amount of water flowing through the valve and long service life.

The invention discloses a safety valve structure capable of avoiding impact of a valve clack during opening and closing and a method thereof. An upper buffer of the safety valve structure is fixed above a valve rod, a first piston is arranged at the bottom, and an inner cavity located above the first piston serves as a first oil cavity; a first oil conveying hole is formed in the side wall; and a lower buffer set comprises at least two lower buffers of the same structure, and all the lower buffers are located in a valve seat and evenly distributed. Second pistons are arranged at the tops of the lower buffers, and an inner cavity below the second pistons serves as a second oil cavity; and a second oil conveying hole is formed at the lower portion of the outer side wall, the first oil cavity, the oil conveying pipe and the second oil cavity jointly form a communicated buffering channel which is closed all the time, and the buffering channel is filled with buffering media. On the basis of ensuring that a safety valve is opened and closed in a short enough time, the impact of the valve clack to a guide sleeve in the opening stage and the impact of the valve clack to the valve seat in the closing stage are reduced, the service life of valve internals of the safety valve is prolonged, and impact damage in the opening and closing process of the safety valve is avoided.

The invention discloses a time-delay water filling water intake rod, which comprises a water tank, a head-on float cover, a remaining water over-flow level, a transmission rod, a loose joint, a lever,a pivot, a plug, a pressure relief hole, a differential pressure valve, a water filling outlet, a running water interface, a fixing bracket, an inter-float gap, a bottom-sealed sealing port, a bottom-sealed small float, a bottom-sealed water leaking port, an inverted float and a float connecting rod; the water intake rod is mainly characterized in that remaining water exists between the top of the inverted float and the remaining water over-flow level by a certain depth when the plug and the pressure relief hole are sealed, and the duration of a delayed water filling time of the water fillingwater outlet is determined by the amount of remained water, so that the problem of a sanitary appliance that kinetic energy becomes dispersed when flushing is conducted under the assistance of pressure of running water can be solved perfectly.

The invention relates to a shear fork structure quick opening and closing valve which comprises a valve body, a valve rod arranged on the valve body, an opening and closing piece and a driving device, the driving device drives the valve rod to linearly ascend and descend, the shear fork structure quick opening and closing valve further comprises a first X-shaped transmission set located on the upper portion and a V-shaped transmission set located on the lower portion, and the first X-shaped transmission set comprises two first transmission rods arranged in an X shape; a first hinge shaft which ascends and descends synchronously with the valve rod and enables the two first transmission rods to be hinged is arranged at the crossed position of the two first transmission rods, the valve body is provided with a guide part for the upper ends of the first transmission rods to move transversely, the V-shaped transmission set is composed of two second transmission rods placed in a V shape, and the crossed position of the two second transmission rods is hinged to an opening and closing part. The upper ends of the second transmission rods and the lower ends of the first transmission rods are in one-to-one linkage arrangement and are opened and closed synchronously. By adopting the scheme, the invention provides the quick opening and closing valve with the scissor fork structure, which shortens the opening and closing time of the valve by shortening the stroke of the valve rod.

The invention provides a pilot high-pressure valve, and belongs to the field of high-pressure valves. The pilot high-pressure valve comprises a pilot valve and a main valve; the main valve includes a cylinder, a piston, a main valve intake port and a main valve exhaust port; a space in the cylinder is divided into an upper cavity and a lower cavity by the piston; a through hole is formed between the upper cavity and the lower cavity; the lower cavity is communicated with the main valve intake port; the main valve exhaust port is formed in the lower end surface of the piston; a pilot valve cavity and a valve element are arranged in the pilot valve; a pilot valve port is formed in the pilot valve cavity opposite to the valve element; the pilot valve is provided with a pilot valve intake port and a pilot valve channel; the pilot valve channel is communicated with the pilot valve port; and the pilot valve intake port is communicated with the upper cavity of the main valve. The pilot high-pressure valve is compact in structure, short in opening/closing time, high in stability and long in service life.

The invention relates to a high temperature resistance hard sealing quickly-closed door. The high temperature resistance hard sealing quickly-closed door comprises a shell, an upper square round section, a lower square round section, an air cylinder, a main shaft, a crank, a rocker arm, a valve plate and a valve seat. According to the high temperature resistance hard sealing quickly-closed door, the transition of the upper square round section and the lower square round section is connected with a cold air pipeline or a warm air pipeline at the inlet of a coal mill, a pushing force or a pulling force of an air cylinder rod is used for quickly pushing the main shaft to rotate clockwise (in the closing direction) or counterclockwise (in the opening direction) by 90 degrees trough the crank; the rotation of the main shaft drives the valve plate to move through the rocker arm, so that the valve plate and the valve seat are tightly attached or separated so as to achieve the function of isolating a medium inside the pipeline or enabling the medium inside the pipeline to be circulated. The functions of simple structure, zero leakage, no accumulated dust and short opening and closing time are realized; after the high temperature resistance hard sealing quickly-closed door is quickly closed, the temperature inside the coal mill is below 40 DEG C, so that safe operation of a boiler is ensured, and the maintenance work of the coal mill is successfully completed.