54 results about "Safety shutoff valve" patented technology

A double block valve and a valve proving system are disclosed. The double block valve is actuated by a single actuator and includes a valve body housing a cavity. The cavity defines an upstream portion with a fluid inlet and a downstream portion with a fluid outlet. A seating assembly is interposed between the upstream and the downstream portions. A first and a second blocking element are disposed in the valve body and are both movable within the cavity between opened and closed positions. With the first and second blocking elements both contacting the seating assembly, the space therebetween defines an enclosed space with a finite volume. The proving system is used for two safety shut-off valves on a valve train, such as a double block valve. The proving system connects to an enclosed space established between the two safety shut-off valves and includes a pair of three-way valves, oppositely biased pressure switches, and a pump, all of which are interconnected through pneumatic conduits. The proving system uses pressure accumulation and timed decay to determine the integrity of the two safety shut-off valves of the valve train.

A chemical solution dispensing apparatus uses a dissolving tank to hold a solid chemical cake. The dissolving tank delivers the chemical solution into a holding tank by gravitational flow and then to a receiving system. A liquid level sensor in the holding tank senses the liquid level of the solution and calls for water delivery through a conduit into the dissolving tank. When the level reaches a low point a circuit opens a inlet flow valve to deliver water into the dissolving tank. When the level reaches a high point, the circuit closes a safety shutoff valve in the conduit line. A pressure regulator and control relay enable the conduit line to be properly pressurized by an inlet source of water through a shutoff valve that is normally open. When the level in the holding tank rises above the high point, an alarm signal is released to initiate an audible alarm.

A control apparatus for use with utility control valves is disclosed. The control apparatus is in the form of an extension attached to the utility control valve in a variety of applications, such as the water shutoff valve in a toilet tank, sink, or water heater, or a gas valve to a dryer. The extension allows the user to turn off the utility valve without bending, stooping are trying to fit within tight or limited spaces. The extension has provisions to adjust the length to fit a particular application.

The present invention relates to an excess flow safety shut-off valve including: a cylindrical body having an outlet and a mounting part formed at one side thereof and a plurality of guides formed in the mounting part in such a manner as to be protruded inwardly from the outlet; an inlet cap disposed at the opposite side to the outlet in such a manner as to be assembled with the cylindrical body; and a ball member adapted to be supportedly mounted in the mounting part by means of the plurality of guides in such a manner as to be attached to the protruding part of the inlet cap by means of a magnetic force generated from the magnet and adapted to be detached from the protruding part to block the outlet if excess water flow occurs.

The invention discloses a gas-catalysis flameless infrared radiation heating dryer which comprises a fixing support assembly, a gas supply main pipe, a primary gas supply regulating transmitter, a secondary gas supply regulating transmitter and gas supply branch pipes. The fixing support assembly in C-shaped arrangement is provided with gas-catalysis flameless infrared radiation heaters and bottom connection channels, the bottom connection channels are connected with the gas-catalysis flameless infrared radiation heaters, thermocouples and safety shutoff valves are arranged on the gas-catalysis flameless infrared radiation heaters, side heat-insulation plates and top heat-insulation plates are arranged on the outer side surface of a fixing support, and explosion-proof junction box assemblies are further arranged on the gas-catalysis flameless infrared radiation heaters. The gas-catalysis flameless infrared radiation heating dryer has the advantages that the gas-catalysis flameless infrared radiation heating dryer is simple in structure, good in service performance and high in service efficiency and practicality, and can be used conveniently and quickly, the product outer surface processing efficiency can be effectively improved, heated air circulation of infrared radiation generated by the gas-catalysis flameless infrared radiation heating dryer can be prevented, accordingly, dirty spots on outer surfaces of products can be prevented, and operation time can be shortened.

Fluid control valves, such as a humidifying module bypass valve, an inlet shutoff valve, an outlet shutoff valve are opened and closed by the pressure of air flowing in a fluid flow path. The pressure of air flowing in the fluid flow path is regulated, based on a drive demand pressure emitted to drive the flow control valves, by the flow rate of air discharged from an air compressor, the degree of opening of a fuel cell bypass valve, the degree of opening of an air pressure regulation valve, etc. The drive demand pressure for driving a shutoff valve is set such that, for example, the greater the absolute value of the negative pressure inside the fuel cell stack, the higher the drive demand pressure, and the air pressure is controlled to be the drive demand pressure. Since the pressure of air flowing in the fluid flow path is regulated based on a drive demand pressure of the fluid control valves, the response of drive and reliability of the fluid control valves are better than those in the case where, for example, the pressure is regulated based on a request from a fuel cell.

The invention discloses an energy-saving and low-flow-resistance Y-type shutoff valve, which comprises a valve body, a valve clack, a valve rod, a valve rod guide device, a valve clack locating pin and an upper seal of a valve cover. The end face of the valve clack is of a concave arc shape, and when the valve clack is in a fully-open state, the concave arc of the end face of the valve clack is of a shape, which forms an overall arc in a manner of being matched with a flow path where the end face of the valve clack is located. The energy-saving and low-flow-resistance Y-type shutoff valve is reasonable in structure, the valve clack is matched with the valve body, when the valve is fully opened, the entrance of the valve clack and a valve seat hole form a matched and smooth curved surface, the exit of the valve clack and a through hole of the valve body form a matched and smooth channel, and the moving direction and the position of the valve clack are determined through the combination of parts, such as the valve body, the valve rod, the valve clack, an upper seal seat, and the guide of the valve clack and the valve rod, so that the correct position of the valve clack is ensured when the valve clack is opened, the forming of a matched flow line of the valve body and the valve clack is ensured, and the effects of energy saving and consumption reducing are reached.

It is disclosed a shut-off valve which acts automatically and has a fully mechanical performance with respect to the loosing of the tower-shape part balance under the effect of the special acceleration which is arisen from the quakes waves or serious vibrations, while such vibrations are mainly resulted from collision or effusion. A static tower has been applied for the main core of this part of the valve which loses balance state under the effect of collision and bounces to the neighboring part, which results in release of the catch and blockage of the gas passing channel.

The invention discloses a double-shutoff valve device applicable to press pouring of reinforced concrete. The double-shutoff valve device is installed in a preformed hole in the lower portion of the side wall of a steel pipe and comprises a first shutoff valve and a second shutoff valve; the first shutoff valve comprises two first positioning holes, a first shutoff piece and a first shutoff valve seat, wherein a first open pore formed in the lower half portion of the first shutoff piece is matched with the preformed hole, the first shutoff piece is fixed to the steel pipe, the first shutoff valve seat is provided with a second open pore which is matched with the first open pore, and the second open pore is aligned with the first open pore; the second shutoff valve comprises two second positioning holes, a second shutoff piece and a second shutoff valve seat, wherein the lower half portion of the second shutoff piece and the second shutoff valve seat are provided with a third open pore and a fourth open pore respectively, the third open pore and the fourth open pore are matched with the second open pore for installation, the second shutoff valve seat is installed on the first shutoff valve seat, and the second shutoff piece is installed between the first shutoff valve seat and the second shutoff valve seat. The double-shutoff valve device applicable to press pouring of the reinforced concrete has the advantages of being convenient to assemble and disassemble, high in compactness and rigidity, large in number of turnover times and the like.

An object of the present invention is to provide a gas leakage checking device and a method for the same, for checking fuel-gas leakage of safety shutoff valves simply and securely by measuring a pressure in a fuel supply pipe. The gas-leakage checking device 8 includes a first safety shutoff valve 81 disposed in a fuel-gas supply pipe 89 of the gas internal combustion engine 1 for permitting or shutting off a flow of the fuel gas, a second safety shutoff valve 82 disposed on a downstream side of the first safety shutoff valve 81, a gas-leakage checking pipe 89c branched from between the first and second safety shutoff valves 81, 82, a gas-discharge valve 83 disposed in the gas-leakage checking pipe 89c and configured to discharge the fuel gas between the first and second safety shutoff valves 81, 82, a first pressure meter P1 for detecting a pressure of the fuel gas in the gas-leakage checking pipe 89c, and second pressure meters P2, P3 disposed on a downstream side of the second safety shutoff valve 82, for detecting the pressure of the fuel gas in the fuel-gas supply pipe 89.

The invention discloses a high-reliability mining elevator hydraulic control system. The system comprises a first motor, a variable pump, a high-pressure pipeline, a low-pressure pipeline, a high-pressure safety valve, a low-pressure safety valve, an oil tank, a first pump-motor, a second pump-motor, a safety check valve set, an energy accumulator set, a pressure sensor, a rotating speed sensor, a second motor, a hydraulic pump, an overflow valve, a one-way valve, a pressure reducing valve, an electromagnetic reversing valve, a brake cylinder, an oil replenishing tank and a control oil source; and further, a variable mechanism of the variable pump comprises a variable cylinder and a servo valve. The system realizes the energy recovery and the stable-speed control of a mining elevator, and effectively improves the energy utilization efficiency and the working performance of the mining elevator.

The invention relates to an intelligent safety cutoff device, belonging to the controller of safety cutoff valve, wherein it can cutoff the operation of device to control the switch of cutoff valve, when the user pressure is increased or decreased over the user application pressure range. The invention adds one spring positioning sleeve based on present safety cutoff valve controller, to separate the inner space; the spring positioning sleeve is arranged with non-pressure spring and over-pressure spring; the non-pressure control element and the over-pressure control element both function the transmission rod; the transmission rod is added with one group of non-pressure impact block; the non-pressure impact block and the over-pressure impact block are independently mounted at two sides of rolling bearing; the remote signal device is mounted at the face of control valve body, near the film chamber, to form 45-50 degrees with the transmission axle. The invention has high accuracy and less pressure difference.

The invention relates to a comprehensive heat management device suitable for a hypersonic flight vehicle. The comprehensive heat management device suitable for the hypersonic flight vehicle comprises a temperature control valve (1), an evaporator (2), a fan (3), a cabin (4), a compressor (5), a condenser (6), a throttling valve (7), a shutoff valve (8), a second shutoff valve (9), an air-hydrocarbon heat exchanger (10), a flow regulation valve (11), a filter (12), a third shutoff valve (13), a fourth shutoff valve (14), a second fan (15), electronic equipment (16), a pump (17) and the like. Hydrocarbon fuel stored in a hydrocarbon fuel tank (21) serves as a link of a whole system, so that all sub-systems are connected. The hydrocarbon fuel serves as the link of the whole system, all the sub-systems are connected, and thus heat management of the hypersonic flight vehicle is achieved. Compared with the prior art, the comprehensive heat management device has the advantages and positive effects of being improved in performance, reduced in cost and the like.

The invention discloses a method for manufacturing a gas shutoff valve. The method includes steps of 1) extruding aluminum and forming; 2) cutting a blank piece; 3) processing; 4) cleaning; 5) assembling. The gas shutoff valve body is manufactured by extruding aluminum profile, so that the gas shutoff valve body is free of sand holes, the gas shutoff valve assembled by the gas shutoff valve body is good in air tightness and free of gas leak, potential safety hazards are eliminated, and safety is guaranteed. Furthermore, since the gas shutoff valve body is free of the sand holes, repair of the gas shutoff valve due to gas leak is greatly reduced, yield and production efficiency are improved, and social competitiveness of enterprises is enhanced.

The invention provides a turbine bypass control system comprising a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a condenser, a condensate pump, a low-pressure heater, a deaerator, a feed water pump, a high-pressure heater, a high-pressure bypass, a high-pressure bypass pressure reducing valve, a low-pressure bypass, a low-pressure bypass pressure reducingvalve, a first water supply pipe, a second water supply pipe, a third water supply pipe, a desuperheating water shutoff valve, a high-pressure bypass desuperheating water valve and a low-pressure bypass desuperheating water valve. The turbine bypass control system further comprises a valve control system used for controlling the high-pressure bypass pressure reducing valve, the low-pressure bypass pressure reducing valve, the desuperheating water shutoff valve, a high-pressure bypass desuperheating water valve and a low-pressure bypass desuperheating water valve to work and an upper computer.The valve control system is electrically connected with the upper computer. The turbine bypass control system is high in automation degree.

A gas shutoff valve having a sensor in cooperation with a magnet to hold a seal mechanism in an open position allowing a flow through a valve body, wherein sufficient disturbance of the valve causes the sensor to sufficiently separate from the magnet to release the seal mechanism to block the flow of gas through the valve. The sensor resides in a sensor housing and means are provided to level the sensor housing to provide consistent operation of the valve when the valve body is not level.

The invention relates to a sampling assembly for detecting a pH value of a polymerization kettle. A sampling opening is disposed at an outlet of a filter; an inlet shutoff valve is connected with the sampling opening; one end of a pressure sampling device is connected with the inlet shutoff valve; the other end of the pressure sampling device is connected with an inlet of a circulation bracket; an outlet of the circulation bracket is connected with an outlet shutoff valve; one end of the circulation bracket is provided with an open flange; the other end of the circulation bracket is provided with a sensor installation opening; a pH transmitter is fixed on the circulation bracket through an installation fixing end cover of the sensor installation opening; an outlet of the outlet shutoff valve is connected with a termination tank through a reflux pipleline; one end of the pressure sampling device is provided with an installation flange; the other end of the pressure sampling device is sealed; a pressure transmitter is mounted on the pressure sampling device; the pH transmitter is connected with a pH controller; the pH controller is connected with a control valve and a flow transmitter; one end of the control valve is connected with the flow transmitter; and the other end of the control valve is communicated with the polymerization kettle. The assembly is small in maintenance amount, convenient for maintenance, low in failure rate and convenient for disassembly. A probability that a detection chamber of the sensor is blocked by polymer is greatly reduced.

The invention discloses a single-stroke acting chain transmission wave energy conversion device which comprises an oscillating float, a mechanical energy-electric energy conversion device and a floating machine frame. The oscillating float comprises a wave absorbing floating body, a chain fixing device and a guiding device, the mechanical energy-electric energy conversion device comprises a chaintransmission device, a speed-increasing transmission, a one-way coupler, a power generator, a flywheel and an electric control box, the floating machine frame includes a truss main body built by rods,a truss upper platform, a safety floating body, a guide rod, a truss lower platform, a lifting system and a damping counterweight system, the chain transmission device comprises a chain penetrating through the wave absorbing floating body, a load sprocket, a reversing sprocket and a chain tensioning device, one side of the chain is fixed to the oscillating float and transfers and outputs the kinetic energy of the wave absorbing floating body, and the lifting system includes an air compressor, a check valve, a two-position three-way valve, a safety shut-off valve, a lifting pontoon and a connecting pipeline. The floating energy conversion device is simple in structure, stable and reliable, can be lifted and lowered, can resist strong wind and waves, and has the high wave energy utilizationrate.

The invention provides a delay shutoff valve which comprises a valve body of which two ends are opened, wherein a hollow driving seat can be rotationally arranged in an upper end port of the valve body; a moving plate is arranged below the driving seat; an accommodation cavity for allowing water current to flow into is formed between the moving plate and the driving seat; a central water outlet is formed in the moving plate; a fixed plate with a central water outlet is arranged below the moving plate; a valve cap is arranged below the fixed plate; a hollow connecting piece is fixedly arranged in the driving seat; the upper part of the connecting piece extends out of the driving seat and is fixedly inserted into a lower cover; a driving shaft unit can be arranged in the connecting piece in a sliding way and at an interval from a V-shaped sealing ring; an upper cover is fixedly connected to the upper part of the driving shaft unit; a spring is clamped between the upper cover and the lower cover; and the lower part of the driving shaft unit downwards extends out of a water outlet of the moving plate. The delay shutoff valve provided by the invention not only has a delay closing function, but also can be used for adjusting the temperature and the flow of water current.

The invention discloses an automatic shutoff device for leakage valves of an edible oil pipeline, relates to an edible oil delivery pipeline accessory, in particular to a safety shutoff alarm device for the leakage valves of the edible oil pipeline. The automatic shutoff device comprises a fixing support, a motor and a control circuit, and is characterized in that the fixing support is mounted on the edible oil pipeline, the motor is mounted on the fixing support, and a shift fork is mounted on a shaft of the motor; the front end of the shift fork is plugged into a rotary switch of one valve; the control circuit is mounted on one side wall of the fixing support and a control switch of the control circuit is disposed on the outer portion of the fixing support; a receiver is mounted on the fixing support; an alarm light is mounted on the ground visibly; the control circuit, the alarm light, the receiver and the motor on the fixing support are connected into a loop through conductor wires, and the control circuit is connected with an external power supply; multiple edible oil pipeline flow rate detection and signal transmitters are respectively mounted at different sections of the edible oil pipeline, and the inner wall of the valve is provided with a nano-coating.

The invention discloses a toxic smoke safety shutoff valve which comprises a valve body, a valve plate and a gas sealing box, wherein a valve plate sliding chute is arranged on the inner lateral wall of the gas sealing box. The toxic smoke safety shutoff valve has the advantages that the valve plate is sealed by dynamic pressure: a seal ring simultaneously expands outwards under the effect of high-pressure gases when the valve plate is opened in place or closed in place under the effect of an air cylinder, the seal ring is tightly attached to a valve base, dynamic pressing of the valve plate and the valve base is achieved, and the valve plate and the valve base are sealed without leakage; the valve body is sealed by gas pressure: the valve body is of a totally sealed structure, after nitrogen is filled into the valve body, pressure in the valve is larger than that in a coal gas pipe, and therefore toxic smoke is ensured not to leak into the valve body and gas sealing of the valve body is achieved; safe alarming is achieved: safety accidents caused by damage of the seal ring are avoided; automatic ash cleaning is achieved: ashes are ensured not to accumulate in the valve body; and the air inlet mode of a hollow pipe of a piston rod is improved, and therefore the toxic smoke safety shutoff valve is attractive in appearance, ingenious and safe.

A system and method of operating a water supply system with one or more water consuming appliances is provided. The water supply system includes a hot water heater for supplying a flow of heated water through a supply conduit to at least one water consuming appliance. The water consuming appliance receives the flow of heated water and provides an indication of a fault condition if excessive water accumulates in the appliance, which might indicate a malfunction with a drain pump or a water supply valve. A safety shutoff valve is positioned on the supply conduit and is in operative communication with the water consuming appliance. The safety shutoff valve is configured for stopping the flow of heated water when it receives the indication of the fault condition.

According to the present invention, a gas supply device capable of measuring a flow rate is provided with: a flow rate controller which controls the flow rate of a passing gas; a first shutoff valve provided downstream of the flow rate controller; a second shutoff valve provided in a first flow passage which communicates with the downstream side of the first shutoff valve; a second flow passage which branches from the first flow passage; a third shutoff valve provided in the second flow passage; a pressure detector which detects the pressure in a flow passage surrounded by the first, second and third shutoff valves; a temperature detector which detects the temperature in the flow passage surrounded by the first, second and third shutoff valves; a tank for volume measurement which is connected downstream of the third shutoff valve and has a known volume; and an arithmetic and control device which finds the volume of the flow passage surrounded by the first, second and third shutoff valves by applying Boyle's law with the third shutoff valve in an open state and a closed state, and also calculates the flow rate of the flow rate controller using the flow passage volume and detected values from the pressure detector and the temperature detector.

The invention discloses a dual-safety exhaust valve, which comprises a valve body, and an upper valve body and a lower valve body are fastened together to form the valve body. The dual-safety exhaust valve is characterized in that: the upper valve body and the lower valve body are welded to form a one-piece structure, a holder is arranged at the joint between the cavities of the upper valve body and the lower valve body, the upper end of the upper valve body is provided with an exhaust nozzle with a side air hole, an exhaust bolt is screwed in the upper end of the exhaust nozzle, a push pin is arranged under the exhaust bolt, the diameter of the push pin is less than the diameter of a main exhaust hole, a float is arranged in the cavity of the valve body, a conical valve seat is arranged on the top of a connecting rod, the lower part of the connecting rod is connected with the float, the connecting rod runs through a ring in the center of the holder, the upper end of the conical valve seat is matched with the main exhaust hole, the lower end of the lower valve body is provided with a water intake and discharge hole which communicates with the cavity of the valve body, and a filter screen is also arranged at the joint between the water intake and discharge hole and the cavity of the valve body. The dual-safety exhaust valve has the characteristics of simple structure, low cost and long service life, and not only has an automatic exhaust function, but also can adopt a manual operation mode to exhaust the air.