73results about How to "Low cracking pressure" patented technology

A fuel injection system for internal combustion engines includes an injector supplied from a high-pressure fuel source and with a pressure booster device, in which the closing piston can be acted upon by fuel pressure to attain a force exerted on the closing piston in the closing direction, and in which the closing pressure chamber and the return chamber of the pressure booster device are formed by a common closing pressure return chamber, and all the portions of the closing pressure return chamber communicate with one another permanently for exchanging fuel, so that despite a low pressure boost by the pressure booster device, a relatively low injection opening pressure is attainable.

A gas generator includes a housing, which has outflow openings for outflowing gas, and at least one destructible insulation foil which in a non-activated state of the gas generator closes at least one of the outflow opening so as to be moisture-tight. The insulation foil has a varying thickness. The varying thickness is provided by at least one thermally insulating foil layer with a varying thickness, which lies over a base layer.

A packaging material for forming at least a part of a package for a product releasing gasses comprises a one-way pressure relief valve (18) including a first inner film (10), being provided with at least one inlet opening (13,14) therethrough, and a second outer film (11) covering the at least one inlet opening (13, 14) and being bonded to the first inner film (10) to form a channel portion (12) between the inner and the outer film. The channel portion (12) communicates with the surroundings of the package through at least one outlet opening (15) spaced apart from the at least one inlet opening (13, 14). The pressure relief valve (18) further comprises a liquid (19) provided in the channel portion (12) and solid spacer means (17) provided in the channel portion (12) proximate to the at least one inlet opening (13, 14). The outer film (11) is a soft film having such a flexibility or elasticity that in a tensile test a force of less than 5 N is needed for elongating a test piece thereof having a width of 15 mm by 5%.

A vibration damper having a sensitive response behavior at very low amplitudes comprises a separating piston being disposed inside a bypass so as to move axially freely. The separating piston divides the bypass into two chambers mutually sealed from one another. Two valves are disposed in the bypass. The first valve acts in a compression stage as a pressure limiting valve and as a non return valve in an extension stage. The second valve acts as a pressure limiting valve in the extension stage and as a non return valve in the compression stage.

The invention discloses a device and method for leading liquid nitrogen to a barefoot well. The device includes a liquid nitrogen storage tank, a sealing liquid storage tank, a supercharging conveyingdevice, a conveying pipeline, a back sealing device, a liquid nitrogen spray gun and a front sealing device; the liquid nitrogen storage tank and the sealing liquid storage tank are connected to thesupercharging conveying device; the supercharging conveying device is connected to the back sealing device through the conveying pipeline; a liquid nitrogen inlet of the liquid nitrogen spray gun anda sealing liquid inlet of the front sealing device are connected to a liquid nitrogen outlet and a sealing liquid outlet of the back sealing device respectively; and the front sealing device seals theother end of the liquid nitrogen spray gun. The beneficial effects of the invention are that the device is simple in structure and is easy to operate and use; (2) reservoir pollution can be avoided through liquid nitrogen perforation; and (3) reservoir rocks are soaked in the liquid nitrogen to form more fracture nets, and then the fracturing effect can be improved.

The invention discloses a plunger-type double-passage different-direction synchronous joint control check valve for a double-layer continuous oil pipe, which is arranged between the double-layer oil pipe pipelines. The plunger-type double-passage different-direction synchronous joint control check valve comprises a left valve body, a right valve body, an inner passage piston, an inner passage piston seat, an outer passage piston, an outer passage piston seat, a long pin, a crossing plunger, a slide block, an inner passage piston return spring, an outer passage piston return spring and a slide block return spring. According to the plunger-type double-passage different-direction synchronous joint control check valve, the parts such as the piston, the return spring, the movable slide block and the like are simultaneously and additionally installed in the inner layer and the outer layer of continuous oil pipe passages, a different-direction synchronous joint control design scheme is adopted, a double-passage different-direction joint control check valve device is formed, so that when accidents happen, the passages of the inner and the outer continuous oil pipes are effectively sealed, the return of the well liquid is prevented, and the blowout is prevented.

The invention provides a built-in bottom filling anti-overflow control device for a canned oil tank. The built-in bottom filling anti-overflow control device comprises a hydraulic control main valve,a floater guide valve and a connecting pipe, wherein the hydraulic control main valve is arranged in an inlet pipeline oil tank at the bottom of the oil tank, the floater guide valve is arranged at the top of the oil tank, the floater guide valve communicates with the hydraulic control main valve through a connecting pipe, and the liquid control main valve realizes opening and closing of the valvethrough the inlet and outlet pressure difference; when the liquid level is lower than the set height, the floater guide valve is opened, and the hydraulic control main valve is automatically opened under the pressure difference effect; when the liquid level reaches the set height, the floater floats to enable the floater pilot valve to be closed, and the hydraulic control main valve is automatically closed, namely, the hydraulic control main valve realizes pilot control through the floater pilot valve, and when the oil in the oil tank reaches the set volume height, the floater pilot valve isclosed, so that the hydraulic control main valve is controlled to be closed to prevent the oil tank from overflowing.

The invention discloses a piston rod oil inlet double-action multi-stage hydraulic cylinder, and relates to the field of hydraulic cylinders. The piston rod oil inlet double-action multi-stage hydraulic cylinder comprises a cylinder body, at least two stages of piston rod assemblies arranged in the cylinder body in a sleeving mode stage by stage, multiple one-way valve assemblies, an ejection roddevice and a balancing valve assembly; each piston rod assembly comprises a piston and a piston rod; each one-way valve assembly comprises an in-cylinder one-way valve used for controlling rod cavities of the corresponding adjacent two stages of piston rod assemblies to communicate with each other or be intercepted; the ejection rod device is used for driving the in-cylinder one-way valves to be opened or closed, when the pistons in every two adjacent stages of the piston rod assemblies are separated in the stretching or retracting process, the ejection rod device is self-locked; and when thepistons in every two adjacent stages of the piston rod assemblies make contact with each other in the stretching or retracting process, the ejection rod device drives the in-cylinder one-way valves tobe opened; and the balancing valve assembly is fixed to the piston rod of the lowest stage of the piston rod assembly. According to the piston rod oil inlet double-action multi-stage hydraulic cylinder, the problem that a sealing ring is prone to being worn due to the fact that a traditional multi-stage hydraulic cylinder adopts radial holes can be solved, internal leakage of the hydraulic cylinder is avoided, and it is guaranteed that each stage of a hydraulic cylinder body can not generate the overpressure phenomenon.

The invention discloses a dual-channel different-direction joint-control check valve which comprises a left valve body, a right valve body, an inner piston, an outer piston, an inner reset spring and an outer reset spring. A gap with the preset size is reserved between the hole wall of a first right through hole and the hole wall of a first left through hole, a plurality of inner grooves are evenly circumferentially arranged in the outer wall of the inner piston and correspond to the gap, a plurality of outer grooves are arranged in the inner wall of the outer piston in a manner of being in one-to-one correspondence to the inner grooves, the bottom of each outer groove is provided with one pin shaft reset spring, one pin shaft is jacked into the inner groove through the pin shaft reset spring, the hole wall of the first right through hole is provided with blind holes corresponding to the pins shafts, each blind hole is provided with one slider and a slider reset spring which press the slider onto the pin shaft, and the inner piston drives the outer piston to move synchronously through the pin shafts when moving rightwards under the pressure of the left side. By the arrangement, blowout accident can be effectively prevented when accident happens.

The present invention discloses a path-type liquid medicine delivery electro-osmosis pump that can be applied to a wearable medicine device.

An electro osmosis pump according to the present invention includes: a connector provided with a liquid medicine inlet and a liquid medicine outlet; a check valve assembly combined to one side of the connector; and a driver that is connected to the other side of the connector and moves the liquid medicine toward the liquid medicine outlet by applying pressure to the liquid medicine while being separated from the liquid medicine, which passes through the check valve assembly.

A hydrostatic drive system includes a user in the form of a differential cylinder connected in a closed circuit to a high-pressure pump. A piston-side compression chamber and a piston-rod-side compression chamber of the differential cylinder are in communication with the high-pressure pump. The closed circuit includes a protection device having first and second protection valve devices that each includes a pressure relief valve and an anti-cavitation valve. The pressure relief valve of the first protection valve device is provided with an override device, by means of which the opening pressure of the pressure relief valve can be varied. When the high-pressure pump delivers into the piston-rod-side compression chamber, the pressure relief valve of the first protection valve device is adjusted by means of the override device to a reduced opening pressure and the differential volumetric flow flows out via the pressure relief valve to a low-pressure system.

The invention discloses a backflow preventing device with low opening pressure, low flow resistance and reliable check. The backflow preventing device comprises a water inlet check valve, a water outlet check valve and a discharge valve, wherein the water inlet check valve and the water outlet check valve divide the backflow preventing device into a water inlet cavity, a middle cavity and a water outlet cavity; a first rubber diaphragm movably covers a first valve port between the water inlet cavity and the middle cavity through a water inlet spring, and isolates the water inlet cavity and the middle cavity; and in the state that an acting force F1 which is generated by multiplying an area S1 of the first rubber diaphragm in the outer ring water inlet cavity of the first valve port by water inlet pressure intensity P1 is larger than an acting force F3 of the water inlet spring on the first rubber diaphragm, the first rubber diaphragm is away from the first valve port, the water inlet cavity is communicated with the middle cavity, and the valve port of the water inlet check valve is open. The backflow preventing device has the characteristics of low opening pressure, low flow resistance and reliable check, the influence on water pressure of a terminal user is extremely small, water pressure of a specified outdoor fire hydrant outlet is met, and easily-damaged parts can be convenient to replace.

The invention relates to a rotary interception flexible flap valve, and belongs to the technical field of control devices on medium pipelines. The rotary interception flexible flap valve comprises a basic frame fixed to the outer wall of the water outlet of a pipeline; a flow channel is formed in the basic frame; the outer edge of basic frame is provided with a flange; a pressure block is fixed outside the flange; a groove is formed between the flange and the pressure block; a flexible diaphragm bar is fixedly connected into the groove; the lower end of the flexible diaphragm bar is fixedly connected with an opening and closing plate; the opening and closing plate has an integral rigid structure; the lower end of the opening and closing plate is a free end; when the opening and closing plate is closed, the opening and closing plate is contacted with the outer end face of the basic frame; the opening and closing plate is in contact connection with one end of a carrier rod; the other end of the carrier rod is electrically connected with an electric driving device. The rotary interception flexible flap valve has an interception (current-regulating) function. Flexible diaphragm cloth is adopted instead of the conventional rigid hinged structure, so that the opening pressure of the valve is very low (namely, low water loss).

An air management system that allows safe and convenient forms of interval training exercise to be performed on pneumatically elevating rebound exercise equipment. The system includes at least one air intake valve and bleed valve. By providing repeatable degrees of difficulty for both air intake and air release from the extendable air springs employed for the exercise, competitive athletes and their coaches can design, employ, repeat, and compare individualized medium- or high-intensity interval protocols for optimal cardiovascular training programs.

The invention discloses a low-differential-pressure synchronous dual-fixed-valve deep-well pump applied to the petroleum industry, which is used for extracting crude oil from a mechanical oil production well. The low-differential-pressure synchronous dual-fixed-valve deep-well pump comprises a pump barrel, an upper fixed valve and a lower fixed valve, wherein the upper fixed valve and the lower fixed valve are both installed below the pump barrel and are connected through a link rod. Because the link rod is designed between the upper fixed valve and the lower fixed valve, the synchronous opening and closing of the double fixed valves are ensured, the lower fixed valve ensures that the flow velocity of well fluid is greatly reduced, and the service life of the oil well pump is prolonged. The invention effectively solves the problems of lagged opening and closing of the fixed valves, low depth ratio of the pump, high differential pressure inside and outside the pump barrel, increased clearance between a plunger piston and the pump barrel, increased pump leakage and the like in the traditional deep-well pump. The invention increases pump efficiency, prolongs pump inspection period, obviously reduces production cost and has obvious economic benefits.