Pilot pressure regulator equipped with solenoid valve and feedback control system

Abstract

The pressure regulating pilot is installed as an actuator on the main valve and commands the main valve to maintain the pressure at the set point. The output pressure is adjusted by increasing or decreasing the amount of spring compression behind the diaphragm. Spring compression adjustment in this type of pilot is done using two solenoid valves, which allows us to turn on and off the flow and adjust the output pressure remotely and from the control room. The pilot also has a feedback control system that can increase or decrease the speed of opening and closing the valve and adjusting the pressure. This pilot also has the ability to install equalizing balancers.

Description

Description of the invention Title of the invention Pilot pressure regulator equipped with solenoid valve and reaction control system Technical background of the relevant invention The pressure regulator pilot is installed as an actuator on the main valve and commands the main valve to maintain the fluid pressure at the set point. The pilot and main valve assembly is used as an industrial regulator in gas transmission lines to control pressure and flow. This type of pilot can also be used as an independent pressure reducing regulator in laboratory equipment and precision instruments. Technical problem and stating the objectives of the invention The fluid controllers and pilot-operated regulators available in the country use a side actuator called a pilot to adjust the pressure at the outlet. These pilots determine the pressure at the outlet of the main valve by compressing the spring on the diaphragm, which is done manually. The problem arises when the fluid flow needs to be controlled remotely. For example, the flow can be turned off and on from the control room or the pressure at the outlet can be increased or decreased. Existing regulators do not have this capability and require a physical presence next to the regulator to make changes to the outlet pressure. In such cases, a control valve is used to control the flow remotely, which, in addition to being a complex mechanism and being more expensive than a regulator, also requires external compressed air to adjust the pressure. In old pilots, an adjustment screw placed on the spring is used to increase or decrease the pressure. By turning this screw clockwise, the pilot spring is compressed and the pressure at the outlet of the main valve increases.In addition to the physical presence in the fluid transmission lines, this operation may be difficult to perform due to scale or rust and other factors. Also, the pilot's reaction speed to increase and decrease the pressure depends entirely on the speed of turning the screw and is done completely manually, which may cause the pressure to rise quickly and become dangerous if the operator is unaware. Another problem with old pilots was that in the event of severe fluctuations in the input pressure, another pilot was installed as a feeder or pressure equalizer next to the main pilot to absorb the fluctuations in the input pressure and deliver the pressure without fluctuations to the main pilot, which in addition to occupying a lot of space and being expensive, requires additional pipes and connections. The purpose of designing this innovative pilot is to turn regulators into a type of valve control that can control the fluid flow remotely and does not require a physical presence next to the regulator.Also, with this design, the pilot's response speed can be precisely adjusted, and to increase the pilot's accuracy in large fluctuations in input pressure, small side balancers can be used without the need to adjust the pressure at the end, without using additional pipes and fittings. A description of the state of the prior art and the history of developments related to the claimed invention. Today, in the world, gas pressure control, regulation, and reduction operations are carried out using various methods, each of which has its advantages and disadvantages. However, what was obtained in the following research from existing search sites is as follows. Since this idea is new and has different applications, the search was conducted on the following specialized sites. 1. https: / / www.emerson.com / en-us / catalog / tartarini-prx 2.https: / / oxford-flow.com / 3. https: / / patentscope.wipo.int / search / en / detail.jsf?docId=US37293809&_cid=P10-M0AKZ5-32818-2 4. https: / / patentscope.wipo.int / search / en / detail.jsf?docId=CA93440289&_cid=P10-M0AL3Z-37343-1 5. https: / / patentscope.wipo.int / search / en / detail.jsf?docId=US37584909&_cid=P10-M0AL3Z-37343-1 Providing a solution to an existing technical problem along with an accurate, sufficient, and integrated description of the invention To solve the problem of manual pilot adjustment, several solutions were considered to control the pilot remotely at the lowest cost. The first plan was to use pneumatic jacks to compress the spring, which was discarded due to its cost, large space requirements, and lack of sensitivity. The second plan was to use a servo motor and ball screw system, which was also discarded due to safety standards and cost. Finally, a plan was presented that uses a solenoid valve to control the spring compression. The plan uses two solenoid valves as actuators to allow the pilot to be controlled remotely using electrical pulses. These solenoid valves, by receiving electrical signals from the control room, open the fluid flow path to the upper chamber of the piston and also open the fluid outlet path, and in this way, the spring compression and ultimately the pressure at the valve outlet can be adjusted. Also, by using a reaction speed control system, the response speed of this type of pilot can be changed.Also, the design of this pilot is such that it can be upgraded to a two-stage pilot by installing an additional device called a pressure balancer. The operation of the pilot (A) is as follows: In the first stage, the inlet solenoid valve (C-1) and the outlet solenoid valve (C-2) do not receive any signal and are therefore closed. In order to zero the flow at the outlet, a signal is first sent to the outlet solenoid valve and the solenoid valve is placed in the open position. In this case, the inlet path of the feed flow (C-10) remains closed by the inlet solenoid valve due to the lack of signal. In this case, the fluid trapped in the upper chamber (C-3) of the piston is directed out of the outlet path of the feed flow (C-12) by passing through the adjustable choke (C-11), and as a result, the piston (C-4) moves upwards under the influence of the pressure spring force (C-5). As a result, the piston is placed in its highest position under the influence of the pressure spring force. When the pressure spring force becomes zero, the balance spring force of the valve (C-6) moves the valve (C-7) upwards and closes the inlet flow path (C-8). In this case, no current is transferred to the pilot output (C-9).To open the flow path and increase the pressure at the pilot outlet, by removing the signal from the output solenoid valve, this solenoid valve is placed in the closed position and blocks the output path of the feed flow. Then, by sending a signal to the input solenoid valve, this valve is placed in the open position and opens the input path of the feed flow. This flow is taken from the branched input flow. When the input path of the feed flow is opened, the flow enters an adjustable choke (D-1) and then enters the upper chamber (C-3) of the piston. The inlet and outlet chokes act like an adjustable needle valve that increases and decreases the flow rate of the inlet and outlet fluid, which can control the speed of the pilot response. The increase in pressure in the space above the piston causes the piston to move downwards, and as a result, the pressure spring begins to compress. The air trapped in the space below (D-2) of the piston is also discharged to the atmosphere through the duct (D-3). When the pressure spring force overcomes the balance spring force, the valve moves downward and the fluid passage to the pilot outlet (C-9) opens.According to the required pressure at the pilot outlet, an electrical signal is sent to the input solenoid valve to provide the required pressure at the pilot outlet. The same operation is used in reverse to reduce the pressure at the pilot outlet, in such a way that by closing the input solenoid valve and opening the output solenoid valve, the fluid is discharged from the upper chamber of the piston through the feed flow outlet and the piston moves upwards, and as a result, the spring compression force is reduced and causes a decrease in the pressure at the outlet. In order to precisely adjust the pressure and increase the pilot response speed, a feedback is taken from the output flow and transferred to the space below (D-5) of the jiggle plate (D-6) through the feedback duct (D-4). The output feedback flow has oscillations and is oscillated by passing through the orifice (D-7) and transferred to the space below the diaphragm (D-8). The output pressure is determined by the combination of the pressure spring, balance spring, and the pressure under the diaphragm, which adjusts the distance between the seat (D-9) and the orifice (D-10). The piston balance spring (D-11) is also used to counteract the effects of piston friction.To reduce the effects of fluctuations in the inlet flow, equalizing balancers can be used. By loosening the valve seat nut (D-12), it is possible to close the balancer in place of the nut. This does not require any additional connections, piping, or sensors, and it also takes up very little space. Explanation of shapes, maps and diagrams Figure A) shows a general view and a cutaway view of a pressure regulator pilot equipped with a solenoid valve and a feedback control system. Map B) This image shows an exploded view of the pilot components, which consists of the following different parts: 1- The main body of the pilot The main part is the pilot, which contains the flow inlet, flow outlet, and output pressure feedback. The orifice is also located in its center. 2- Orpheus The flow passage is where the pressure and flow rate are determined based on the distance between the seat and the orifice. 3- Valve The location of the rubber seat. It also determines the distance between the seat and the orifice, depending on the position of the diaphragm. 4- Giglore page The output feedback current is oscillated by passing through the holes embedded in this plate and transmitted to the bottom of the diaphragm. 5- Cap It is the diaphragm stabilizer and also the location of the output pressure spring and the piston balance spring. 6- Sit It is used to close the flow path when the output pressure force and the spring force are equal. 7- Valve seat nut It is used to fix the valve in the center of the orifice. 8- Valve nut O-ring It is used to seal and prevent fluid leakage outside the pilot. 9- Lower Orifice O-ring It is used to prevent internal settling when using a balancer. 10- Orifice O-ring It is used for sealing and preventing internal leaks. 11- Valve O-ring It is used for sealing and preventing internal leaks. 12- Aperture It is used to separate two pressure zones. 13- Diaphragm gasket connection screw Used to attach the diaphragm washer to the diaphragm. 14- Diaphragm gasket The location of the output pressure spring. 15- O-ring of the Zigloor plate It is used to seal and prevent fluid leakage outside the pilot. 16- Valve balance spring It is used to move the valve when the pressure and spring forces are equal. 17- Guide pin The main body, the jiggle plate, and the piston ring are used to center the piston. 18- Piston chamber The location of the piston and the screw adjusts the reaction speed. 19- Solenoid valve cover It is installed to protect the solenoid valve. 20- Piston It is used to adjust the output pressure spring. 21- Inlet solenoid It is used to receive electrical pulses and command the actuator inlet valve to open and close. 22- Output solenoid It is used to receive electrical pulses and command the actuator output valve to open and close. 23- Input reaction speed adjustment screw Used to adjust the actuator response speed. 24- Output reaction speed adjustment screw Used to adjust the actuator response speed. 25- Input speed adjustment screw retaining bar It is used to prevent the input speed adjustment screw from coming out. 26- Output speed adjustment screw retaining bar It is used to prevent the output speed adjustment screw from coming out. 27- Output pressure spring It is installed to adjust the output pressure according to the degree of compression. 28- Piston O-ring It is used for sealing and preventing internal leaks. 29- O-ring for input speed adjustment screw It is used to seal and prevent fluid leakage outside the pilot. 30- O-ring for output speed adjustment screw It is used to seal and prevent fluid leakage outside the pilot. 31- Piston balance spring It is used to eliminate piston friction force. 32- Inlet solenoid valve piston housing The location of the solenoid valve inlet piston. 33- Outlet solenoid valve piston chamber The location of the solenoid valve output piston. 34- Inlet solenoid valve piston spring It is used to keep the inlet valve closed. 35- Output solenoid valve piston spring It is used to keep the outlet valve closed. 36- Inlet solenoid valve piston The location of the inlet seal seat. 37- Output solenoid valve piston The location of the outlet seal seat. 38- Inlet solenoid valve seat It is used to seal the inlet flow path. 39- Outlet solenoid valve seat It is used to seal the outlet flow path. 40- Inlet solenoid valve O-ring It is used to seal and prevent fluid leakage outside the pilot. 41- Outlet solenoid valve O-ring It is used to seal and prevent fluid leakage outside the pilot. 42- Inlet solenoid valve nut It is used to connect the bobbin to the inlet piston housing. 43- Outlet solenoid valve nut It is used to connect the bobbin to the output piston housing. 44- Diaphragm washer nut It is installed to connect the gasket to the diaphragm. 45- Solenoid valve cover connection screw Used to connect the cap to the piston chamber. 46- Piston chamber connecting bolt It is used to connect the piston housing to the cap. 47- Main body connection screw It is used to connect the main body to the cap. A clear and precise statement of the advantages of the claimed invention over prior inventions. 1. Turning the main valve on and off from the control room without the need to be on site. 2. Adjust the flow pressure in the main valve from the control room without the need to be on site. 3. Less weight and smaller dimensions due to simple mechanism. 4. Less breakdown due to the use of fewer moving parts in pressure regulation. 5. More reliable performance in the face of input pressure fluctuations due to the ability to install a side balancer. 6. Use of a jiggle plate that reduces feedback current fluctuations. 7. Using the reaction speed control system to adjust the pilot's response speed. Description of at least one implementation method for implementing the invention After preparing the drawings in accordance with the relevant standards, the pilot main body molds and covers are made and forging operations are performed, and the pilot bodies are produced in accordance with the material mentioned in the standard by forging operations. After the forging operation is completed, the parts are sent for final machining with CNC machines and final machining is performed. After the machining stages are completed, the parts are sent for plating and painting. The internal parts of the pilot do not require molding and are produced with CNC turning and milling machines by preparing the drawings. The steel parts are ready to be assembled and the iron parts are plated. After the relevant tests are performed on the parts, they are sent for assembly and assembled in accordance with the instructions. The final stage is the performance test of the produced product, which is prepared in accordance with the tests mentioned in the standard of the desired regulator. Explicit mention of the industrial application of the invention This invention is a pressure reducing and regulating regulator that is installed next to the main valve and, by placing the assembly in the gas transmission lines, commands the main valve to maintain the pressure at a certain point. This pilot can also be used as an independent regulator to reduce and regulate pressure in laboratory equipment and precision instruments.

Claims

Claim What is claimed: Claim 1) The pilot pressure regulator is equipped with a solenoid valve and a feedback control system. This pilot is a pressure reducing and regulating regulator that is installed as an actuator to regulate the fluid pressure on the main valve and commands it to maintain the pressure at the set point. The output pressure set point is achieved by compressing the spring with a movable piston controlled by two solenoid valves. This pilot consists of the following components: - The main body of the pilot: It is the location of the inlet, outlet and feedback fluid flow ducts, on top of which the jigger plate is installed and the valve seat nut is installed in the lower part. - The valve seat nut: Which is installed in the lower part of the main body of the pilot and is the location of the balance spring and the valve. - The jigger plate: It is installed between the main body of the pilot and the diaphragm and captures the fluctuations of the output feedback flow and transfers it to the lower part of the diaphragm. - Diaphragm: It is installed between the jet plate and the cap and separates the two pressure zones of the atmosphere and the output feedback pressure.- Cap: It is installed between the diaphragm and the piston chamber and is the location of the outlet pressure spring and the piston balance spring. - Piston chamber: It is installed between the cap and the solenoid valve cap and is the location of the piston and the reaction speed adjustment screw. - Solenoid valve cap: It is installed on the piston chamber to protect the solenoid valves. - Piston: It is installed inside the piston chamber and adjusts the spring compression by moving up and down. - Outlet pressure spring: It is installed inside the piston and cap and adjusts the outlet pressure. - Piston balance spring: It is installed under the piston and neutralizes the effects of piston friction. - Valve: It is installed in the central part of the main body and orifice and adjusts the seat and orifice opening by moving due to the change in the position of the diaphragm. - Orifice: It is the flow passage and also the seat seat. - Solenoid valve: They are installed on the piston chamber and open and close the fluid passageway through the piston by receiving an electrical signal.- Valve balance spring: It is installed on the valve and blocks the fluid flow path by equalizing the spring forces of pressure and feedback flow. - Reaction speed adjustment screw: It is used to adjust the speed of pressure increase and decrease. Claim 2) According to claim number 1: A piston performs the compression action of the pressure spring, which is like a cylindrical shaft with a hole in it and the output pressure spring is placed inside it. Claim 3) According to claim 1: The piston balance spring is located inside the cap and under the piston and neutralizes the effects of piston friction, as the piston balance spring surrounds the output pressure spring.

Images