1380results about "Engine diaphragms" patented technology

The utility model discloses an automatic closing valve for gas pipeline leakage and a self-closing valve thereof, and relates to the technical field of structural design of gas self-closing valves. According to the gas pipeline leakage automatic shut-off valve, a vent hole is formed in the middle of a shell, a leather film is connected to the edge of one side of the shell in a sealed mode, a connecting structure is arranged on the edge of the shell, a gas inlet is formed between the connecting structure and the leather film, and the connecting structure is connected with the inner wall of a gas pipeline in a sealed mode. According to the self-closing valve, a timer is arranged on a valve body, a closing device is arranged at the gas inlet end of the valve body, and a gas pipeline leakage automatic closing valve is arranged at the gas outlet end of the valve body. The problem that in the prior art, automatic closing of the gas pipeline can not be achieved when leakage happens to the gas pipeline, and use safety of gas is affected is solved. According to the gas pipeline leakage automatic closing valve and the self-closing valve thereof, when gas leakage occurs, the gas pipeline leakage automatic closing valve can be automatically closed. And through the closing device of the self-closing valve, the action of the closing valve is further ensured, and the effectiveness of leakage closing is ensured.

The invention relates to the technical field of valves, and provides a water pump control valve with a downstream pipe burst emergency shutoff function, which comprises a main valve body with a water inlet port and a water outlet port, and further comprises a control cavity, and the control cavity comprises an upstream control cavity and a downstream control cavity; the water pump control valve further comprises a reset reversing valve and a turn-off reversing valve, the reset reversing valve comprises an upstream pressure collecting end, a first downstream pressure collecting end, a first reversing pressure collecting end and a drainage end, and the turn-off reversing valve comprises an upstream pressure output end, a second downstream pressure collecting end, a second reversing pressure collecting end and a downstream pressure output end. The reset reversing valve and the turn-off reversing valve selectively enable the control cavity to be in a dynamic adjusting state or a rapid turn-off state according to the pressure of the first reversing pressure collecting end and the pressure of the second reversing pressure collecting end respectively. By means of the technical scheme, the problem that in the prior art, a water pump control valve cannot meet the requirement for quick turn-off in emergency circumstances is solved.

Embodiments disclosed herein are directed to a drainage control system including, a tubular body with a tubular body lumen extending from a distal end to a proximal end and a collapsible tube disposed within the tubular body lumen, the collapsible tube including a collapsible tube lumen extending from a distal end to a proximal end of the collapsible tube. The collapsible tube can be attached to the tubular body, such that fluid flow through the tubular body lumen flows through the collapsible tube lumen. The tubular body can include a valve that is actuatable between a first configuration wherein fluid flow is allowed through the tubular body lumen and a second configuration wherein fluid flow is prevented through the tubular body lumen. An airflow source can be coupled to the valve such that pressure from the airflow source actuates the valve.

A diaphragm valve assembly includes a bonnet portion and a body portion affixed together through a clamp structure providing pressure to a perimeter seal through angled inside surface of the clamp and matching angled surfaces of the bonnet and body portions. While the clamp provides load on the perimeter seal, a second level of sealing may be accomplished through an O-ring seal between the bonnet portion and the body portion. An adapter structure may be used to affix conventional bonnet and body portions through a clamp. The adapter structure may be implemented in various forms. A weir of the body portion and a bead of the bonnet portion may be aligned through fold-over or extended tabs of the diaphragm and cushion.

The invention relates to the technical field of pressure valves, and provides a high-back-pressure pneumatic valve for a semiconductor chemical system and an assembling method of the high-back-pressure pneumatic valve. The high-back-pressure pneumatic valve comprises an air cylinder assembly, a diaphragm and a valve seat. The cylinder assembly is provided with a cylinder upper cover and a cylinder body which are connected through a rotary lock catch structure, and the piston is assembled on the cylinder body. The diaphragm is provided with a sealing diaphragm part and a valve element integrally arranged in the center, the sealing diaphragm part is provided with a pressure-bearing protrusion and a sealing hook, and the pressure-bearing protrusion provides a back pressure counteracting area accounting for 25%-50% of the flexible area of the diaphragm. A valve port and a flow channel are formed in the valve seat, a mounting hole aligned with the valve port is formed in the valve seat, a sealing clamping groove is formed in the mounting hole, and the sealing clamping groove and the sealing hook are matched to form a sealing interface. The valve element table body is arranged at the valve port and driven by the air cylinder assembly to seal or break away from the valve port. According to the invention, high-back-pressure fluid impact can be effectively balanced, and the assembly efficiency and the maintenance convenience are greatly improved.

A liquid supply bath device includes a main body including a flow passage having an inlet through which liquid flows in and an outlet through which the liquid flows out, an accommodation space in which the liquid is accommodated and of which an upper portion is opened to insert a discharge unit configured to discharge the liquid to a substrate, and a connection passage connected to the flow passage and the accommodation space. The liquid supply bath device further includes an opening / closing valve disposed on the main body and configured to open and close the connection passage.

A control valve capable of accurately and easily adjusting a degree of a communication opening or a volume of a flow channel with a simple configuration is provided. A control valve (flow-rate regulator valve 16) includes: a valve housing 20 including a flow channel block 21 with a flow channel in which a fluid flows; a valve assembly 50 mounted on the valve housing 20 to be movable in a first direction and provided with a valve body 31 configured to change the degree of the communication opening of the flow channel; and an operation shaft 51a including a shaft section 53 inserted into an insertion hole 52 formed in the valve housing 20 and a tapered shaft section 54 being in contact with the valve assembly, and a position of the valve body through the tapered shaft section is adjusted by motion of the operation shaft in a second direction.

A pneumatic valve comprises an actuator with a movable closing element being disposed in a housing; the closing element with a tappet penetrating an actuator opening between an air chamber formed in the housing and an actuator chamber, and a plate, with a sealing element, for closing the supply opening, thereon, on that end of said tappet protruding into the air chamber, and an elastic element pressing the plate toward the actuator opening in an activated state; the actuator element configured to move, in a non-energized state, the activating element to press the tappet against a supply opening, and in an energized state to move the activating element so as not to exert force on the tappet so that the plate is pressed in the direction of the actuator opening by the elastic element. A sealing collar disposed about the tappet seals the air chamber from the actuator chamber.

The invention provides a double-layer combined air bag material for foundation pit dewatering well plugging and an intelligent preparation process, and belongs to the technical field of air bag materials for foundation pit plugging. Comprising an outer-layer air bag, an inner-layer air bag, an inflation system and a control system, the outer-layer air bag and the inner-layer air bag form a honeycomb type distribution structure, the outer-layer air bag wraps the inner-layer air bag, and the contact face of the outer-layer air bag and the inner-layer air bag is of a curved surface attaching structure; the surface of the inner-layer air bag is coated with a waterproof sealing layer, the inflation system and the control system are arranged on one side of the outer-layer air bag, and the control system is electrically connected with the inflation system. By means of the double-layer combined air bag structure and the inflation control system, the problems that a traditional single-layer air bag is insufficient in pressure resistance, prone to deformation and leakage, poor in environmental adaptability and lack of real-time monitoring and adjusting in foundation pit dewatering well plugging are solved, and the stable, lasting and intelligent plugging effect still can be kept in the complex environment of the foundation pit dewatering well.

A device that may be a valve or a pinch valve is disclosed. The device includes at least the following components: (1) a flexible sleeve and (2) two end connection ports that are located on opposite ends of the flexible sleeve. The device may also include one or more of the following: an actuator, a body or housing, and a heating element. The flexible sleeve is capable of having the high-temperature material flowed therein and being in direct contact with the flexible sleeve. The high-temperature material is a material at a temperature above 200° C. For example, the high-temperature material may be a molten material in a casting process. A method of using the device is also disclosed. The method involves, at least, the following steps: (1) providing a flexible sleeve, and (2) flowing a high-temperature material into the flexible sleeve. The steps may be part of a casting process involving molten material, such as molten metal or molten metal alloy. The flexible sleeve may be provided as part of a device, such as a valve or pinch valve.

The invention discloses a double-acting pressure reduction diaphragm type pressure flow amplifier in the field of industrial flow control. The double-acting pressure reduction diaphragm type pressure flow amplifier comprises a machine body, a double-diaphragm assembly, a valve core and two air paths. Compressed air of the two air paths is from different sources, the cross sectional areas of the two air paths are adjusted by moving the valve core through the double-diaphragm assembly, the output proportion of the compressed air of the two paths can be adjusted, and therefore the purpose of changing the pressure intensity and the flow is achieved. The pressure is reduced by the following measures: two independent pressure reducing devices are arranged; and the output air is introduced into the double-diaphragm assembly, and a part of pressure intensity of the adjusted air is counteracted. The purpose of adjusting the pressure intensity and the flow of output air is achieved through linear reciprocating motion of the double-diaphragm assembly, various measures are adopted to reduce the pressure intensity of the adjusted air, and the application scene is wider.

The utility model discloses a diaphragm valve which comprises a valve body, a cover body, a diaphragm, a driving assembly and a pressing block. A non-return piece is integrally arranged on the valve main body and extends upwards on the outer side of the neck part; a limiting bulge is arranged on the skirt part; wherein the non-return piece and / or the limiting protrusion are / is provided with a guide face facilitating movement of the cover body in the locking direction, and when the cover body is combined with the valve body and locked, the diaphragm abuts against the valve body. The limiting protrusion is connected to the non-return piece in a clamped mode so as to limit the cover body to move in the unlocking direction. The non-return piece and the valve main body are integrally arranged, the situation that the non-return piece and the valve main body are not installed in place, and therefore free reverse rotation of the cover body cannot be blocked is avoided, the non-return piece is arranged to be of an upward extending structure, the non-return piece is made to deform more easily, and when the cover body is rotated to enable the cover body and the valve main body to be locked or unlocked, the non-return piece is not prone to deformation. The non-return piece can deform towards the space between the non-return piece and the valve body, and the problem that the whole valve body is replaced due to the fact that the non-return piece is broken is avoided.

The utility model relates to the technical field of electrically-driven pumps, in particular to a valve and a gas control device, which comprise a bottom plate with a bottom plate hole part, a cover plate with a gas outlet hole part, a valve plate with a valve plate hole part and a support plate with a gas release channel, the bottom plate, the support plate and the cover plate are sequentially stacked, a cavity is arranged in the center of the support plate, and the gas release channel is arranged in the cavity. A valve chamber is formed, the valve plate is arranged in the valve chamber, the air release channel is formed in the periphery of the supporting plate and communicated with the valve chamber, the bottom plate hole part, the cover plate air outlet hole part and the valve plate hole part are oppositely arranged, the bottom plate hole part is annular, and a valve plate hole part blocking plate opposite to the valve plate hole part is formed in the middle area of the bottom plate hole part. According to the valve and the gas control device, gas leakage is conducted through the lateral gap, the gas leakage area is greatly increased, the gas leakage speed is increased, the valve and the gas control device are more suitable for wrist type and arm type sphygmomanometers and massage instrument products so as to meet better user experience, meanwhile, the failure risk caused by blockage due to entering of impurities can be reduced, and therefore the reliability of the products is improved.

The present invention achieves a larger flow rate of a fluid control valve without increasing a size of an orifice or an actuator. The fluid control valve includes an orifice having a valve seat surface and a valve body having a seating surface to be seated on the valve seat surface. The orifice has a plurality of inflow ports and a plurality of outflow ports that are open along a first direction on the valve seat surface. The plurality of inflow ports and the plurality of outflow ports are arranged side by side in a second direction intersecting the first direction.

The invention belongs to the technical field of control valves, and particularly discloses a control valve and process for wash supplies production, the control valve comprises a flange pipe, a lower valve shell is fixedly arranged in the middle of the flange pipe, a partition block is fixedly arranged on the inner side, close to the middle, of the lower valve shell, and conveying ports are formed in the positions, close to the two sides of the partition block, in the lower valve shell; switching assemblies are arranged in the lower valve shell and on the lower side of the lower valve shell, four liquid inlet assemblies are arranged on the switching assemblies, each switching assembly comprises two annular grooves formed in the inner side of a partition block, a partition piece is arranged between the two annular grooves, and a semicircular opening is formed in the lower side of the partition piece. And communicating ports are formed in the lower sides of the two groups of annular grooves. Through overall cooperative use, the semicircular opening is opened to be communicated with the interior of the flange pipe, liquid materials of wash supplies can be conveyed from the interior, and shutdown for replacement of the diaphragm is avoided.

The invention relates to the technical field of pumps with electric drive, in particular to a valve and a fluid pump, the valve comprises a bottom plate with a bottom plate hole part, a cover plate with a cover plate hole part, a valve plate and a supporting plate with an air leakage channel, the bottom plate, the supporting plate and the cover plate are sequentially stacked, the middle of the supporting plate is hollowed out, and a valve chamber is formed between the bottom plate and the cover plate; the valve plate is arranged in the valve chamber, the thickness of the valve plate is smaller than that of the supporting plate, an air leakage gap is formed, the air leakage channel is communicated with the valve chamber and the air leakage gap and arranged on the periphery of the supporting plate, at least one unclosed parting line is arranged on the valve plate, and the valve plate can deform under the blowing action of air, so that an air port is formed in the area where the parting line is located. The bottom plate hole part, the cover plate hole part and the air port are oppositely arranged, a movable valve is formed in the area where the parting line is located, and the valve and the valve plate part are connected to form a connecting line. According to the valve, through the air inlet valve, the air outlet valve and the valve which are oppositely arranged, the miniaturization, lightening and thinning of a product are achieved, meanwhile, plugging and air leakage of a lateral gap are conducted, the air leakage speed is high, the risk of plugging failure is reduced, and the product reliability is improved.

The invention discloses a pneumatic assembly of a semiconductor flow control component and the semiconductor flow control component. The pneumatic assembly comprises a cylinder body, a hydraulic piston, a pneumatic piston and a valve rod. The cylinder body comprises an annular separator; the hydraulic piston is arranged in the cylinder body in a sliding mode and located on the side, away from the valve body, of the annular partition piece, and the hydraulic piston has the trend of moving towards the annular partition piece / the diaphragm. A pneumatic large-diameter part of the pneumatic piston is slidably arranged in the cylinder body and located on the side away from the hydraulic piston, and the end, away from the pneumatic large-diameter part, of a pneumatic small-diameter part of the pneumatic piston is slidably inserted into the annular partition piece. The valve rod sequentially penetrates through the annular partition piece, the pneumatic small-diameter part and the pneumatic large-diameter part and penetrates through the side wall of the cylinder body to stretch out to act on the diaphragm. The problem that in the prior art, multiple low-pressure pneumatic pistons need to act at the same time, so that the structure is complex is solved, and the pneumatic assembly of the semiconductor flow control component is simpler in structure and smaller in size.

The invention relates to the technical field of compressors. The invention provides an air suction valve plate, a valve group, a compressor, refrigeration equipment and a vehicle. The air suction valve plate comprises a body provided with a plurality of openings; each valve flap is arranged at the corresponding opening, each valve flap is provided with a fixed end and a free end, and the fixed ends are connected with the body; wherein the masses of at least two of the valve tongues are different, and / or the rigidities of at least two of the valve tongues are different. The structure of the air suction valve plate is reasonably arranged, so that the opening and closing frequencies of at least two of the valve flaps are different, in this way, it is guaranteed that in the air suction process of the compressor, an air suction silencer of the compressor and an air cylinder of the compressor are always kept in a communicating state, air suction pressure and pressure fluctuation in the air cylinder in the air suction process are reduced, air suction loss can be reduced, and the air suction efficiency is improved. And the efficiency of the compressor is improved.

A pinch valve includes a housing, first and second pinch bars, an actuator, a first front roller and a first rear roller. The actuator translates the first and second pinch bars relative to one another along a translation axis to pinch a flexible tube extending through an opening of the housing. The first front roller and the first rear roller are spaced from one another in the direction of a longitudinal axis. The first front roller extends transverse the opening and is positioned longitudinally upstream from the first and second pinch bars and the first rear roller extends transverse the opening and is positioned longitudinally downstream from the first and second pinch bars. The housing includes a first wall bordering the opening. A first plane lying tangent to the first front roller and the first rear roller is spaced inward from the first wall of the housing.

The invention discloses a quick-release and quick-change type rubber tube valve. Belongs to the technical field of filling equipment in special industries. The invention mainly solves the problems of complex rubber tube replacement and long replacement time due to the integral valve seat of the existing rubber tube valve. The device is mainly characterized by comprising a rubber tube, a valve seat, a rubber tube clamping opening and closing mechanism and a driving connecting mechanism, wherein the rubber tube is positioned in the rubber tube clamping opening and closing mechanism; the valve seat consists of a fixed valve seat, a movable valve seat and a valve seat movable connecting mechanism between the fixed valve seat and the movable valve seat; an opening and closing mechanism movable connecting mechanism is arranged on one side or two sides of the rubber tube clamping opening and closing mechanism; and the device driving motor is connected with the rubber tube valve through a crosshead shoe coupling. The flow control valve has the characteristics of convenience in disassembly and rapidness in rubber tube replacement, and is mainly used for maintenance and rubber tube replacement of the flow control valve in special industries.

A diaphragm valve for an ultra-pure pipeline comprises a valve deck, an upper valve body and a lower valve body, the upper valve body and the lower valve body are fixedly connected through a bolt, a valve rod, a valve clack, a medium inlet channel and a medium outlet channel are arranged in the lower valve body, a mounting channel is formed in the lower valve body, a plurality of positioning guide grooves which are vertically formed at intervals are formed in the inner wall of the mounting channel, and the positioning guide grooves are communicated with the valve deck. The outer wall of the valve cover is provided with a positioning guide block matched with the positioning guide groove, the bottom of the installation channel extends to be provided with a limiting check ring, the bottom of the valve clack is connected with a cushion membrane piece and a diaphragm piece, the periphery of the cushion membrane piece and the periphery of the diaphragm piece extend to the position between the limiting check ring and the valve cover, and the valve cover is provided with a limiting step. The upper valve body is fixedly connected with the lower valve body in a threaded mode and then abuts against the limiting step, so that the valve deck is fixedly installed in the installation channel, and sealing connection is formed.

A valve (1) is provided with a housing (10) and a valve film (30). The housing (10) is provided with a first housing member (11) and a second housing member (12). The first housing member (11) comprises: a first end member (111) provided with a first surface (F1111) and a second surface (F1112); and a circular first lateral wall member (112) that is directly or indirectly connected to the first end member (111) and that includes a third surface (F1122) on the side of the first lateral wall member which is opposite to the side connected to a section of the second surface (F1112). The second housing member (12) comprises: a second end member (121) that is provided with a fourth surface (F2111) and a fifth surface (F2112) that faces a section of the second surface (F1112); and a circular second lateral wall member (122) that is directly or indirectly connected to the second end member (121) and that is provided with a sixth surface (F2121) that faces or joins a section of the fifth surface (F2112), and a seventh surface (F2122) that faces or joins a section of the third surface (F1122) of the first lateral wall member (112). The first end member (111) is provided with: a plurality of first ventilation holes (21) that communicate the first surface (F1111) and the second surface (F1112); and a first valve seat (19) that is connected to the second surface (F1112) and that is disposed, in plan view of the second surface (F1112), within the ring of the first lateral wall member (112). The first valve seat (19) comprises a first top surface (F19). The first top surface (F19) is positioned closer to the fifth surface (F2122) side than the second surface (F1112) in the thickness direction of the first housing member (11). The second end member (121) is provided with a second ventilation hole (22) that communicates the fourth surface (F2111) and the fifth surface (F2112). The second lateral wall member (122) comprises: an exhaust hole (23) that communicates with the sixth surface (F2122); and a second valve seat (29) that, in a front view of the fourth surface (F2111), is disposed between an inner surface (F220) of the ring of the second lateral wall member (122) and the exhaust hole (23), and that includes a second top surface (F29) on the seventh surface (F2122) side. The valve film (30) is disposed so as to span the inside of the ring of the first side wall member (112) and the inside of the ring of the second side wall member (122), and when viewed in the height direction in which the first housing member (11) and the second housing member (12) are arranged, the valve film comprises: a first portion (31) which overlaps the first valve seat (19); a second portion (32) which overlaps the second valve seat (29); and an outer end portion (330) which is positioned closer to the outer circumferential side than the second portion (29). The valve film (30) is configured so that, in a state in which the outer end portion (330) is sandwiched between the first housing member (11) and the second housing member (12), the second portion (32) is located closer to the first surface (F1111) side than the first portion (31) is, when viewed from a lateral direction orthogonal to the height direction. The thickness of the first portion (31) and the thickness of the second portion (32) are greater than the thickness of the outer end portion (330).

An electric valve, comprising a housing and an end cover. A cavity and a valve port are formed in the housing. The electric valve further comprises a rotor assembly, a rod assembly, and a valve core assembly; the rotor assembly is connected to one end of the rod assembly; and the other end of the rod assembly is connected to the valve core assembly. The electric valve further comprises a sealing component, and the sealing component is distant from the valve port with respect to the valve core assembly; the sealing component comprises a first cylindrical portion, a membrane portion, and an annular sealing portion; by providing the sealing component, the first cylindrical portion is connected to the rod assembly and a connection position is sealed.

A valve (1) is provided with a housing (10) and a valve membrane (30). The housing (10) is provided with a first housing member (11) and a second housing member (12). The first housing member (11) is provided with: a first end member (111) comprising a first surface (F1111) and a second surface (F1112); and a ring-shaped first side wall member (112) that directly or indirectly connects to the first end member (111) and comprises a third surface (F1122) on the side opposite to the side connected to a portion of the second surface (F1112). The second housing member (12) is provided with: a second end member (121) comprising a fourth surface (F2111) and a fifth surface (F2112) that faces a portion of the second surface (F1112); and a ring-shaped second side wall member (122) that directly or indirectly connects to the second end member (121) and comprises a sixth surface (F2121), which faces or joins to a portion of the fifth surface (F2112), and a seventh surface (F2122), which faces or joins to a portion of the third surface (F1122) of the first side wall member (112). The first end member (111) is provided with: a plurality of first ventilation holes (21) that cause the first surface (F1111) and the second surface (F1112) to communicate; and a first valve seat (19) that connects to the second surface (F1112) and is disposed inside the ring of the first side wall member (112) in a plan view of the second surface (F1112). The first valve seat (19) is provided with a first top surface (F19). The first top surface (F19) is positioned closer to the fifth surface (F2112) side than the second surface (F1112) in the thickness direction of the first housing member (11). The second end member (121) is provided with a second ventilation hole (22) that causes the fourth surface (F2111) and the fifth surface (F2112) to communicate. The second side wall member (122) is provided with: a third ventilation hole (23) that communicates with the seventh surface (F2122); and a second valve seat (29) that is disposed between the third ventilation hole (23) and an inner surface (F220) of the ring of the second side wall member (122) in a front view of the fourth surface (F2111), and is provided with a second top surface (F29) on the seventh surface (F2122) side. The valve membrane (30) is fixed to the housing (10) in a state in which at least a portion thereof is deformable inside the ring of the first side wall member (112) or inside the ring of the second side wall member (122), and is provided with a first portion (31) overlapping the first valve seat (19) and a second portion (32) overlapping the second valve seat (29) when viewed in the height direction in which the first housing member (11) and the second housing member (12) are aligned. The valve membrane (30) and the first valve seat (19) constitute a check valve, and the valve membrane (30) and the second valve seat (29) constitute an exhaust valve. When viewed in the height direction, the exhaust valve is disposed at a position surrounding the check valve.

The invention discloses a fluid pipeline system diaphragm valve fault self-adaptive identification method, relates to the technical field of diaphragm valves, and solves the problems that signal characteristics are not subjected to fine analysis and are easily interfered by fluctuation of normal working conditions. The method comprises the following steps: acquiring a to-be-determined wave band, comparing the to-be-determined wave band with a preset standard waveform, identifying a to-be-verified amplitude associated with a corresponding processing process based on a corresponding movement comparison processing process, carrying out abnormity determination on a diaphragm valve based on a specific numerical value of the to-be-verified amplitude, and confirming an abnormal diaphragm valve. The specific accuracy of amplitude verification in the subsequent movement process is facilitated, the abnormal influence caused by signal fluctuation can be effectively reduced, and the specific accuracy in the valve abnormality determination process is improved.

The invention relates to the field of fluid control devices in semiconductor liquid paths, and provides a precise control on-off valve for a semiconductor liquid path and an assembling method thereof, and the precise control on-off valve comprises a valve seat, a cylinder assembly combined on the valve seat, a diaphragm valve plate accommodated in the valve seat, and an adjusting wheel arranged on an upper cover of the cylinder. The air cylinder assembly comprises an air cylinder upper cover and an air cylinder body which are connected through a rotary lock catch structure, and a piston assembly and a limiting rod set are assembled in the air cylinder assembly. And the diaphragm valve plate is driven by the cylinder assembly to seal or separate from the valve port of the valve seat. The adjusting wheel is connected with the limiting rod set and used for adjusting lifting of the limiting lead screw, and then the maximum upward moving position of the piston assembly and the opening degree of the valve are precisely limited. The valve breaks through the bottleneck that a traditional mechanical valve is prone to abrasion and leakage, achieves the effect of precise fine adjustment of flow, and meanwhile greatly improves the flow stability of long-term operation and the clean safety of an ultra-pure fluid system.

The invention relates to the field of diaphragm valve control mechanisms, in particular to a valve actuator and a using method thereof.The valve actuator comprises a valve body and a valve deck fixed to the top of the valve body and further comprises an actuator mechanism, and the actuator mechanism comprises a lower cylinder cover, a cylinder body and an upper cylinder cover which are vertically communicated in sequence; a piston rod penetrating out of the valve deck downwards is arranged in the middle of the upper cylinder cover in a penetrating mode, and the cylinder body is divided into an upper air chamber and a lower air chamber by a piston disc outside the piston rod. The rotatable sliding ring is arranged to be communicated with the upper air pipe connector and the lower air pipe connector, two-degree-of-freedom flexible adjustment of the circumferential position and the rotation direction of the air pipe connector is achieved, and the problem of installation adaptation caused by the fact that the position of an existing actuator air pipe connector is fixed is solved; the sliding ring is unlocked by squeezing the two sets of elastic pieces to be close to the supporting ring, the air pipe connector is driven to adjust the circumferential distribution position so as to adapt to different circumferential layouts of external air path connectors, and operation is convenient and fast.

A self-validated mass flow control (MFC) apparatus and a method of providing self-validated mass flow control are provided. The MFC includes a chamber configured to receive a fluid, an upstream valve disposed upstream of the chamber, and a downstream control valve disposed downstream of the chamber. The MFC further includes a pressure drop assembly disposed downstream of the downstream control valve, and first and second pressure sensors. A controller of the MFC is configured to control actuation of the downstream control valve by switching between a flow-based feedback control and a pressure-based feedback control. In the flow-based feedback control, the flow is monitored based on a rate of pressure decay in the chamber detected by the first pressure sensor when the upstream control valve is closed. In pressure-based feedback control, the pressure upstream of the pressure drop assembly detected by the second pressure sensor is monitored.

This invention relates to a new and improved hydraulic squeeze tool for compressing and stopping flow through a lay flat or poly hose, such invention engineered to increase the speed and efficiency when cutting flow and fluid transfers in pipe and hose systems in domestic, commercial, or heavy industrial applications.