This invention relates to twin seal rotary valves and Hybrid High Integrity Pressure Protection System (H-HIPPS) for critical services, the hybrid system includes a quick isolation subsystem between an overpressure zone and a normal pressure zone and a quick releasing subsystem between the overpressure zone and a lower pressure zone with quadruple redundancies, more particularly, the hybrid system has the novel rotary valve with at least two offsets, twin closure members, twin wedge seal seat assemblies and an novel operation mechanism, a combination of rotary movements and linear movement between closed and open positions for isolating and releasing over pressurize fluids and protecting the valves, actuators and the pipelines or the process plants from surge pressure, fire or leak at the highest level of a system reliability, the quick isolation subsystem has redundant closure members, redundant seats, redundant power supplies, redundant driving system with less than one second closure time while the quick releasing subsystem has the novel hybrid and redundant, rotary pressure relief mechanisms, redundant pressure sensing mechanisms and trims to suppress cavitation and erosion with near zero blowdown pressure and greatly reduce energy loss while still protecting the normal pressure zone from over pressurized fluids.
When pipelines, compression or pumping stations or process plants, pressure vessel are in services, very often, the operations like open and closing, heating or pumping and metering can cause water hammer and pressure surge or fire, leaks, the pressure surge fire or leaks in pipelines or plant can cause many problems as following; (a) Axial temporal and permanent separation of flange joints (b) Pipe fatigue at weld joints (c) Longitudinal pipe splits (d) Severe damage to piping and piping supports (e) loss of property or life (f) Pipe leak (g) High cost for constant repair (h) inaccurate metering due to leaks in supply stations (i) environmental pollution.
There are two current solutions for the problem (1) to block the overpressure fluid or fire zone into a normal pressure zone or (2) to release the overpressure fluid or fired fluid into a low pressure zone or safety tank.
With HIPPS, the overpressure protection is achieved by reducing to a tolerable degree the risk that the pressure can exceed certain maximum levels. HIPPS design is governed by:
In most cases, the HIPPS is equipped with two shut off valves, two actuators and pressure transmitters and a feedback control system, but this subsystem at this point is just a combination of conventional parts like two ball valves, two actuators and pressure sensors and controller and is constructed under overpressure class at least two or three time in overpressure fluid zone even for a short period time and waste lot of materials and capacity in normal pressure conditions, here is the current problems;
So far there is no single valve or actuator, which are developed for the high integrity system.
The conventional quick releasing subsystem is constructed as an overpressure safety device under U.S. Department of Transportation, Pipeline Safety Regulations, Hazardous Liquids Part 195, paragraph 195.428, the subsystem includes the pressure surge relief valve like plug axial pressure surge relief valves, those valves are widely used in the pipeline protection from pressure surge and constructed with main three functions; sensing, tracking and releasing, the plug axial pressure surge relief valves have two types, a gas loaded and a pilot operated configurations, the gas loaded pressure surge relief system has a fast response time about 250 millisecond, but it is equipped with external energy resources like pressurized bottle nitrogen pressure regulator, check valve, tubing, insulated plenum bottle and control boxes, there are the following problems;
The releasing subsystem not only reduce a system reliability, but also has high operation cost to remain the set pressure with high cavitation and erosion damages while the pilot relief system is operated by internal fluid energy with a compact pilot, but the pilot has a remote pressure sensing function and slow response time about two second or more and is less tolerated with dirty fluid and unreliable, every pressure releasing can cause 10 to 30% pressure or energy loss.
In short the both type subsystems do not work efficiently and reliably as a separated or combined unit and have no redundancy and cannot provide a good seal at low temperature, or high temperature or under high speed operations and come with high blow down pressure up to 30% and waste significant fluid energy and need constant seal goods replacements.
So the flow control industry has long sought means of improving the performance of the pressure protection valve and the systems, improving the seal, creating a robust hybrid system, enabling the valve to handle various flows under multiple extreme conditions.
In conclusion, insofar as I am aware, no such a system is formerly developed with versatile seal ring assembly, hybrid highly reliable pressure protection system, easy manufacturing at lower cost, they can be used for blocking and releasing overpressure fluids in critical services.
This invention provides a simple, robust, reliable and versatile hybrid pressure protection system for critical services or under extreme conditions. This hybrid pressure protection system not only release overpressure fluid into lower pressure zone but also isolate overpressure fluid from normal pressures zone, and greatly reduce total isolation time, increase reliability with four redundancies, the subsystem has a valve integrated with actuators, the valve has twin seal seats, two closure members in one valve body, with a novel operation: rotary and linear movements between close and open positions, it reduce the isolating time less than 2 second without damaging seat and shaft seal packing, the system with redundancy feature for the valves and the actuators include two closures members, two pressure sensing devices, two pressure relief paths, two pressure protection methods and it has the highest level of system reliability over all prior arts or existing products.
Accordingly, besides objects and advantages of the present invention described in the above patent, several objects and advantages of the present invention are:
Still further objects and advantages will become apparent from study of the following description and the accompanying drawings.
Drawing Figures
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The closure member assembly 120 includes the left closure 121, right 121′closure and shafts 140, 141′ and has radial groove 131 and a taped groove 134 on both top and bottom of the left closure 121 and right closure 121′, retaining rings 137 and 138 are respectively inserted into the grooves 131 and 134 for securing the joint between the left closure 121 and the right closure 121, the body assembly 101a has bonnet assemblies 110, 110′, each of the bonnet assemblies 110,110′ has two pair of fixed guide pins 117 to guide the closure member assembly 120 through rotary slots 136, 136′ and move along with the wedge parting surface 124, a linear movement to offset centers CO1, CO2 from the center COO, the closure member assembly 120 has two pair of driver pins 139, shafts 140, 140′, the shafts 140, 140′ have respectively bottom bosses 141, 141′ including drive slots 142,142′ in an opposite direction, the drive slots 142, 142′ of shafts 140,140′ are respectively engaged with two drive pins 139 on the closures 121,121′ for operating between offset centers CO1, CO2 and the center COO.
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The closures member assembly 120e has a trim 180 having a release bore 195, a left closure 121e having a front step 122, a right closure 121e′ having a front step 122 and springs 187, 186, each of the closures 121e, 121e′ respectively has cylindrical slots 194,194′ and front stops 122, 122′, the trim 180 has left 181 trim and right trim 181′, each of the trims 181,181′ has multiple 191 through holes from small sizes on outward edges to large sizes to center back bores 184 and 185 and a cylindrical slot 189, a front step 188 against the step 122, the trim 181′ has multiple 191′ through holes from small on outward edges to large holes to center, back bores 184′ and 185′ and a cylindrical slot 189′, the trim 180 is inserted into bores 183, 183′, the pins 190,19′ are respectively inserted and secured with closures 121e′ 121e between slots 194 and 189, between slots 194′ and 189′ to guide the trims 181,181′, the trims 181,181′ are biased by springs 186 in step bores 184,184′ and spring 187 in back bores 185,185′ for supporting the trim 180, conditioning fluids between left closure 121e, right closure 121e′ at small opening and spring 187 and spring 186 at middle opening and between spring 186 and middle holes at full opening, as the closures 120e has a small opening due to small over pressure, the pressurized fluid has more resistance on the small holes and push the trims 181, 181′ to the center and push the springs 187,186, the springs 187,186 are compressed with less gaps between each runs, as results the springs 187,186 greatly reduce cavitation by stepping pressure drop through each run and small hole on trim 180 edge, as the closures 120e has a large flow capacity due to a large opening at the center of the trims 180, the pressurized fluid has less resistance on the all holes and push the trims 181, 181′ to the center much with large openings, so the springs 187,186 have lager gaps between each runs and have larger fluid through the trim to reduce release time, it overcome the most conventional release valve dilemma; flow capacity vs anti-cavitation and erosions function.
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The linear driver cylinder assembly 303 has a pipe 338 and a front cover assembly 342 and a back cover assembly 370 and a piston assembly 334 and a cavity 304 between piston assembly 334 and back cover 370, the pipe 338 has a back step bore 340 engaged with a step bore 371 of back cover assembly 370 for preventing pipe 338 from pulling out, while the back cover 370 is connected with the body 305a by bolts and has two up and low link ports 394, 394′ respectively connected with two up and low link grooves 325,325′, the pipe 338 has a groove 339a, the front cover assembly 342 has four position holes 343a respectively extended to a groove 339b and a release hole 344 extended to a cavity 304b, two of lock plugs 346 have respectively disposed in the position holes 343a, each of lock plug 346 has an eccentric groove 347, a spring retaining ring assembly 349 with small gaps is disposed in the groove 339b against the eccentric groove 347 of the lock plug 324, as the lock plug 346 is rotated, the eccentric groove 347 pushes the spring retain ring assembly 349 into the groove 339a to preventing the front cover 342 from moving out, a screw 374h is inserted into the enlarged gap of ring assembly 349 for preventing the spring ring assembly 349 from retreating back to the groove 339b, two of retractable spring pins 372a are respectively disposed in the position hole 343b for preventing the spring retaining ring 349 from moving out the groove 339a, the retractable spring pin 372a has a spring pin 352b with an internal thread 375b and a setscrew 374b engaged with internal thread 375b for providing additional strength and retreating the spring pin 352b by threading against a bottom of the position hole 343 to push the spring pin 352b out of the position hole 343b.
The piston assembly 334 has a piston 360, seal rings 368a, 368b, seal plug 369a and a rod assembly 335, the piston 360 has a front shoulder groove 362a for receiving seal ring 368a and creating initial seals and expanding to a link groove 363a and four link ports 364a to cavity 304a for creating additional fluid energized seals from fluid energized pressure from cavity 304a, a back shoulder groove 362b for receiving seal ring 368b and creating initial seals and expanding to a link groove 363b and four link ports 364b to cavity 304b for creating additional fluid energized seals from fluid energized pressure from cavity 304b and a middle sealant/grease groove 365 extending to middle link ports 366 for providing seals and lubricant function and pressurizing the sealant when a pressurized fluid is applied to cavity 304a, the triple seal mechanism not only increase seal ability with solid-liquid-solid under static or dynamic conditions and seal life by four time in compassion with the conventional bearing and seal mechanism, but also reduce the friction between seal rings and pipe by 60% without over compression of seal rings and slide load like conventional scotch yoke actuators piston.
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The base actuator 300a has a rotary flexible driving assembly 310a, the rotary driving assembly 310a has a hollow shaft 316 with top three pin holes 318, three bottom pin holes 318 and two rotors 312a and six spring pins 352c and six position bearings 390 and three drive pins 352a and a guide plate 320 placed between rotors 312a, each of the rotors 312a has a shaft bore 315 to receive shaft 316, three pin holes 311, three spring pins 352c are respectively disposed between holes 311 and holes 318 for transferring loads between the shaft 316 and rotor 312a, each of rotors 312a has three radial,cylindrical, slots 313 respectively receiving three position bearings 390 and expanding to top and bottom three pin slots 314 respectively receiving three drive pins 352a, each of cylindrical position bearing 390 movably disposed in slot 313 has a pinhole 391 to receiving pin 352a and a larger OD surface pressed into slots 313 with a gap 393 with a spring function to compensate any wearing between bearing 390 and slot 313, the guide plate 320 has three rod holes 321 respectively to receive rods 335 and expanding to top and bottom three pin slots 322 to receive three pins 352a, the linear rod 335 has a pin hole to receive pin 352a for converting linear movements to rotary movements of shaft 316 through engagements between drive pin 252a and position bushing 390 in bushing slots 313 and pin slots 322 in guide plate 320, the high integral linear-rotary converting system keep the system flexible, balanced but still has a highly integrity and interconnection without loosed parts, while the conventional scotch yoke actuators with the vertical position bushing with linear contact are easy wearing out with large clearance and lost motions. As a single converting unit, the driving assembly 310a is easily to be assembled or disassembled, the spring pins 352c not only absorb impact forces to protect valve seat and packing during operations, but also would be broken under pre-set load as safety devices to protect the actuator as whole as well valves
The right helical actuator 301a has an interface plate 326b, a shaft assembly 351a with three drive pins 352c, and an offset sleeve 383a with an offset surface 384a, a helical sleeve 380a and three helical slots 382a respectively receiving the drive pins 352c for generating right helical movements and a matched offset surface 381a engaged with the offset surface 384a for creating reaction forces against the helical movements in order to rotate the shaft assembly 351a clockwise and a spring set 389a placed between helical sleeve 380a and interface plate 326b for storing compression energy as a spring return forces.
The left helical actuator 301b has an interface plate 326b, a shaft assembly 351b with three drive pins 352c, and an offset sleeve 383b with an offset surface 384b, a helical sleeve 380b and three helical slots 382b respectively receiving the drive pins 352c for generating left helical movements and a matched offset surface 381b engaged with the offset surface 384b for creating reaction forces against the helical movements in order to rotate the shaft assembly 351b anticlockwise and a spring set 389b placed between helical sleeve 380b and interface plate 326b for storing compression energy as spring return forces.
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The rotary driving assembly 310b has the guide plate 320 and two driving gears 312b and racks 357 placed respectively above and below the guide plate 320 for converting the linear movements of the rods 345 to rotary movements of gears 312b through the racks 357, the rack 357 has a boss pin 358 engaged with a pin slot 322 of the guide plate 320 for preventing rack 357 from rotation.
The guide plate 320 has three rod holes 321 respectively to guide the rods 345 movements and three pin slots 322 to restrict the linear travel of the rod 335 as an absolute rotation position of shaft 316b, rotary angle 90 degree=AA+BB for most rotary valve shafts, if they are sympatric, AA=BB=45 degree, or they can be different with a cam effect, it means one side torque at end of 0 or 90 degree is different from other side at end of 90 degree or 0 degree, let's say AA+BB=30+60=90, CC can be less or larger than 90 degree as conventional scotch yoke cam profiles, but it is much simpler
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The offset sleeve 383d has three side holes 332d respectively to receive three retractable spring pin assembly 372b through body position holes 305f, the pin assembly 372b has a spring pin 352d with a wedge surface 378a, a nut 377 with a mated wedge 378b engaged with the wedge surface 378ea, a screw 374e is inserted into the nut 377 through spring pin 352d for preventing the sleeve 380d from moving under loads, the screw 372e not only increase the spring pin 352d strength, but also can retreat the spring pin 352 by threading in the nut 377 to push the spring pin out either by the wedge engagement between the nut 372 and spring pin 352d or the engagement between nut 377 and a bottom of hole 332d to push the spring pin 352d out, body 305f has two position slots 306b, each of slots 306b has three cyclical slots 307, a screw 374e is inserted in the slots 306b with three fixed positions of slots 307.
A double acting helical actuator 301g has a body 305e with ports G and F can be installed with the base actuator 300a or 300b or used as an interdepend actuator with an interface plate 326g, A helical actuator 301g also has an offset sleeve 383d, a right helical sleeve 380e and a left helical sleeve 380f and two seal plates disposed on both ends of the body 305e and a helical shaft with right helical teeth and left helical teeth, the offset sleeve 383d has an offset ID surface 384d and a hole 386 to connect to304f and port F and a slot 385 concerted cavity 304h and port G with and pressure fuse 396, the right helical sleeve 380f has mated helical teeth 387b engaged with right helical teeth of the shaft for helical engaging movements and has a mated offset surface 388f engaged with surface of 384d for reaction engagements to rotate the shaft, the left helical sleeve 380e has mated helical teeth 387e engaged with right helical teeth of the shaft for helical engaging movements and has a mated offset surface 388e engaged with surface of 384d for reaction engagements to rotate the shaft.
Port G is connected with cavity 304h through passage 308e between slot 385 and body 305e, port F is connected to cavity 304i through lock tubing 352e and hole 386, the interface plate 326e has side through hole 327e to receive screw 374e for securing a position between body 305e and interface plate 326e, the shaft can be fixed with 374e through 327e into 373a hole.
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The present invention provides a long sought solution—an inherent high integrity pressure protection system instead of a combination of conventional low integrity pressure protection devices, the solution is (1) the innovative valve operation mechanism, the twin seal rotary valve with Double isolation and bleeding in one body is based on twin seats and twin closures member with at least two offsets, it overcomes inherent non-positive seat sealing of the conventional ball valve either in float and trunnion styles, according to Newton second law Force=acceleration×mass, the design greatly reduce the closures member mass by half and the friction between closure member and seats to zero between 0-90 degrees, moreover the shaft does not support closure member assembly at closed positions unlike the conventional ball valves, it not only reduce the risk of shaft breakdown at high acceleration but also help to speed up closing operation, as a result, the closing time is reduced to less than one second on the average, the life of sealing elements increase by four times, since the closures member is centered without offsets at open positions, so the valve is pigable for all pipeline applications, finally the two stages operations with the rotary movement between 0-90 and linear movement at 90 degree+will great reduce impact force between seats and closure member at 90 degree+stage because two left and right closures move in an opposite direction and balances the torque by two linear reaction forces from left and right seat assembly and secure the positive seal even under high vibration with wedge lock function (2) In relief unit, for the first time, the relief valve is actuated by the scotch yoke mechanism of rotary moment or torsion instead of linear moment or force, so even the compression of spring or gas would increase as the ball is opening due to offsets, the output torque is decreased to middle, so overall set dynamic pressure would stay about the same, the difference between the set static pressure and set dynamic pressure remain less than 5%, the valve has more sensibility to trace the pressure even after opening, the blowdown pressure can be reduced to 3 to 5% and great reduce energy loss of controlled fluid, because the valve torsion mechanism is based on the offset between DD and dd and area of the body port, fluid pressure, while the actuator is based spring or compression gas cylinder still can be designed at smaller size unlike conventional linear relief valve, finally the twin seal valve provide a redundant relief mechanism with two inlet ports in one body and redundant pressure tracing mechanism with spring and compressible gas with no temperatures effect due to the same gas in a contained cylinder (3) both isolating overpressure fluid from normal pressure zone and releasing overpressure fluid into low pressure zone, greatly reducing total shut off time or impact time, risk of water hamper damage or pressure surge in normal pressure zone, rather than the old response time, which is meaningless (4) by nature, the rotary valve has the less volume replacement over other linear valves with the same size bases, in isolate side, the rotary assembly is much faster to close than other conventional linear or ball valve valves due to less fluid resistance with the same moving direction, or secondly a combination of the immediate sensing and releasing and a distant sensing and releasing, for the first time, the relief valve can handle both clear fluid or dirt fluids without passage blocking, sensing valve, (4) redundancy, inherent redundancy include (a) the left and right closures assemblies in the valve (b) the left and right actuations (c) external and internal actuation energies (d) top and bottom actuations (e) immediate sensing and a distinct sensing (f) compression spring and compressible gas sensing.
The present invention discloses other breakthrough achievement—Hybrid wedge seal rings for both seat seal and shaft packing seal, the isolate valve and relief valve bring in great challenge for sealing in fast speed of closing and opening with high impact force, high frequency for relief valve and fire safety applications, so far there is no single seal ring to meet the challenge with soft seal or hard metal seal. Any leak can happens under two conditions, one there are gaps or leak path between two seal surfaces, other is the pressure difference between leak path ends, so no gap or leak path, no leak, even with leak path or gasp, as long as there is no pressure difference, still no leak, so this breakthrough is based the leak principle, soft seal material like rubber or PTFE can fill gaps or leak path between two seal surfaces, but are not strong enough to hold high pressure, while metal seal can hold high pressure, but is not good to fill gaps between two surfaces, in most cases metal to metal seal is required with surface finish less 16 RMS.
The wedge ring seat assembly combine strengths of both metal material and nonmetal materials by filling soft material in the gaps or leak paths and placing metal seal materials in the middle to hold the seals from both upstream and own downstream under pressures unlike the conventional ball and butterfly valves with metal ring on side, moreover the metal wedge ring acts as a spring and push internal ring and out ring radially expand by up to 50% of compression force as well as provide with axial compression seals hold the pressure from both upstream and downstream even with PTFE, while conventional ball valves with PTFE seat with spring cannot stand for high pressure over class 300, the wedge ring seat assembly can be used for rotary valve as well as linear valves like gate valve, one very important for the combined seal ring is the cryogenic application, like LNG terminals, there are fast shutoff valves between LNG plants and LNG vessels, but the most PCTFE are used for cryogenic applications and cannot stand for high impact, fast closing and leak after some cycles, especially for the valves with size 4″ up, while metal seal like Inconel only can hold pressure at low temperatures but cannot stand for high temperature difference between external while wedge seal ring with PTFE as non-metal materials assembly can stand pressure class up to API 20,000 PSI or ANSI class up to 4500 without reinforced materials.
The wedge shaft packing unlike conventional shaft packing is the first stem packing in the world to aim the root of causes for shaft leak and fugitive emission, unlike conventional V packing, graphite yard packing, lip seals and other recent developed packing steals, the wedge shaft packing distinguish static seals from dynamic seals, they are two different seals by natures, according to a recent study related to this invention, the dynamic seal has four major issues related to shaft leak and fugitive emission (1) dynamics enlargement accounts for about 40% of shaft packing failure due to relative movements between the shaft and packing with offsets between the shaft axis and packing axis (2) wearing accounts for about 30% of shaft packing failure due to dynamic frictions between packing and shaft (3) Accelerated chemical corrosion accounts for about 15% of shaft packing failure due to relative movements between the shaft and packing (4) foreign object inclusion accounts for about 10% of shaft packing failure due to relative movements between the shaft and packing, while static seal has no four issues, most valve and packing manufactures do not recognize the root of causes, the internal wedge packing assembly as an active wedge ring is designed to provide dynamic seals between the shaft and the packing with those four issues,while the external wedge ring assembly as a passive wedge is designed to handle static seals between the packing and the stuff box without those four issues, the internal wedge ring assembly is made of high density, anti-wearing materials with like Inconel wires constant filling the gaps or leak paths, the metal support ring is designed to provide anti-dynamics enlargement and hold pressure between each wedge packing assembly and prevent foreign objects and provide accelerated corrosion with special materials like zinc, finally external wedge ring assembly is deigned to generate more backup force with flexible material with scarified metal rings, so the internal and external wedge assemblies resolve most conventional packing problems with much lower cost efficiently and effectively, the metal wedge is designed to provide up to 50% of high radial compression force from axial compression forces, much higher than any passion ratio, since the wedge ring is under buckling, the lager deformation happen away below the yield strength of the material with special material or heat treatment, the wedge metal ring not only fill any gap between the internal ring and external ring but also provide compression force for fugitive emission less than 50 ppm to meet EPA concern decree and API 622, 624, 641 for both rising stem as well as part turn stem valves, while without the wedge spring ring, the conventional graphite seal material can covert the compression force radial force by 17% of compression force as the Poisson rate even with live-loaded devices, while wedge seal ring with PTFE as non-metal materials assembly can stand pressure class up to API 20,000 PSI or ANSI class up to 4500 without reinforced materials, the wedge shaft packing assembly can be used for pump shaft instead of the expensive mechanical seal assembly with high support force with support ring and metal wedge ring and used for ball valve seat seal ring instead of lip seal which has lower radial support capacity, the wedge seat assembly can hold large size 48 and up, the high pressure API 20,000 and up, such a wedge stem seal ring assembly for both rotary and linear valves and for both a vertical or horizontal positions and provide low cost, but reliable, versatile functions and can last up to 25 years or a million cycles without replacement or readjustment,
The sealant teeth between packing pocket and shaft is a novel solution to both static and dynamic seals for extreme applications like less than 10-50 ppm fugitive emission requirement or high temperatures with 1500 F or more, because of no seal wearing, non-replacement equipment is required and the cost is lower and reliable but a simple structure, since teeth seal self is a sealing mechanism, sealant add additional seal protection, teeth seal can be static or dynamic, the sealant can be pre-installed or externally feeding.
The triple seal mechanism in the actuation a piston is a heart of long life piston in this invention, the compression and pressure energized on both front and back seal rings not only provide adequate seal as normal seal ring and reduce the wearing with less compression and less friction, but also have energized seal to compensate seal ring wearing to extend the life under pressure side through the link holes, the middle groove with sealant not only provides seal and pump the sealant under pressure side,but also provide the constant lubricant to reduce the frication between pipe and seal rings and protect the seal surface from corrosion damages.
The universal adapter is another great invention with valve/actuations joint, the versatile adapter has one output and three inputs, three inputs include manual, electrical, hydraulic or pneumatic power supplies in term power source and quartier turn or multiple turn in term of types, for many installations, the actuations for the valves at beginning are manually operated, after test trials, automated control is added for normal operations, so the couple assembly is set for those applications or emergency and used for engaging or disengaging between one top input and two side inputs, two set gears connected with two rods with right and left threads are provided with two unique multiple turn powered inputs, the two drive pin assembly has not only improve pin strength with large middle section, but also increase durability and strength of bushing with two flat surfaces and spring function with a slot to compensate any wearing of bushing flat surfaces, finally the two or more pin joint between the rotor and shaft not only provides stronger joint for both valve shaft and actuator shaft, but also reduce backlash and stress concentration in comparison with key joint and absorb the impact of valve closing and save valve seats and packing and act as a safety device.
Without high integrated actuation system, the High Integrity Pressure Protection System would not be created, those current problems like unbalanced actuation system which is the inherent problem for the most actuators in the market, the actuation systems without protection device from excessive torsion or unbalanced or loosened joints between actuators and valve account for 80% valve seat or packing failures, so far no single valve or actuator manufacture recognize that, the universal actuation system in this invention is a synergic improvement from two prior patents and is to aim to improve the overall performances by modularizing and equipped with both helical actuator and scotch yoke actuator, the driving unit is joined by spring and coiled pins to absorb fast operation impact or excesses torsion and save the valve seats and stem packing seal, first if the torques reach a designed limit, the spring pin between the valve shaft and actuator haft would be broken as a first safety device, if the torques reach a further designed limit, the spring pins between the actuator shaft and actuator rotors would be broken as a second safety device, so the valve and actuator would be saved with the safety redundancy, the pressure supply system is powered by both pneumatic and hydraulic supplies and more efficiently and safely by reusing exhaust gas from helical actuator to lower pressure scotch yoke actuator unlike the conventional gas over oil actuation release the pressure gas to the air, it not only waste the energy and pollute the air, moreover, the system with a scotch yoke actuator has double acting and a helical actuator with a single acting and spring return can actuate the valves by using the exhaust air from scotch yoke actor into helical actuator as a turbocharged unit, as a result, it not only reduce the spring cost and air consumption, but also increase spring return torque with additional turbocharged torque and operation speed,
The separation between relative position adjustment mechanism and conventional absolute position adjustment is other great innovation in this invention, for most operators in the field, a correct closed position is critical for all rotary valve, even 0.5 degree off can cause leak, but 99% of stem position adjustments are about the stem relative position to the joint flanges bolt holes with no need to alter a factor set range 0-90+/−0.5 degree, only 1% of the actuation adjustments is an absolute adjustment between 0-90+/−5 or 10 degree, the relative positions adjustments on the rotatable interface plates is a simple solution to 99% problems, for further position security, anti-loosening washers or semi-permanent adhesive may be added with the bolts after setting a correct position, for 1% problems,the factory set 90+/−5 can be solved at the factory, it along saves 60% time in most rotary actuations installation, moreover the top and bottom interface plates can be interchangeable, so without changing the design or installing the cylinder assembly, the direction of rotations of actuator can changed from clockwise e to anticlockwise, or for any valve connection without body change especially in field repairs, it is a great feature, the seal plate and interface plate can be made as a part.
The trim in the ball in this invention provides a simple and effective way to reduce the cavitation and erosion without reducing the fluid capacity, the trim is constructed with multiple through hole from small size from edge to larger size in the center, since the trim is movable and biased by springs, the flow condition can change any time unlike most fixed trim as the rotation of ball, it also can be used for water damping on dams or river or energy dissipating cone valve and terminal fluid control, the springs in the trim not only help install the trim, but also separate one fluid stream into two or three as the opening is increasing and absorb fluid impact and reduce cavitation and erosion
Finally the actuator with bolt-less and tubing-less actuator not only reduce the cost for anti-corrosion expensive bolts by eliminating bolts external corrosion specially under subsea water service, or offshore platform application, or creeping under hot weather, and stand for high cycle operations like high cycle relief application without retightening bolts and increase reliability, but also reduce tubing leak by accident hit during the operation and transportation and reduce the pollution if the naturel gases are used for actuation power supply, multiple fluid pads is one critical part for fast closing less one second without damaging valve seat and stem packing by operating three or two ports at the beginning and one or two ports at the closed position.
Although the description above contains many specifications, these should not be construed as limiting the scope of the invention but as merely providing illustration of some of the presently preferred embodiments of this invention.
Thus, the scope of the invention should be determined by the appended claims and their legal equivalents, rather than by the examples given.
This application claims the benefit of provisional patent application Ser. No. 62/479,252 filed on Mar. 30, 2017 by the present inventor. Federally sponsored research NoSequence listing or program No
Number | Date | Country | |
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62479252 | Mar 2017 | US |