Compact double-Y-shaped multifunctional combination valve

Abstract

The invention discloses a compact double-Y-shaped multifunctional combined valve which is characterized in that the inlet end and the outlet end of a double-Y-shaped valve body are coaxial, the axis of a first inclined middle hole is parallel to the axis of a second inclined middle hole and intersects with the axis of an inlet and outlet channel, and the axis of the first inclined middle hole and the axis of the second inclined middle hole are inclined relative to the axis of the inlet and outlet channel; the first inclined middle hole is provided with a valve seat hole obliquely communicated with the inlet and outlet channel, the second inclined middle hole is provided with a valve seat hole communicated with the inlet and outlet channel, and the lowest point of the upper end and the highest point of the lower end of the obliquely-arranged valve seat hole are both located in the range of the inlet and outlet channel. Concave flow cavities are formed in the lower ends of the valve seat hole, through which the first inclined middle hole is obliquely communicated with the inlet and outlet channel, and the valve seat hole, through which the second inclined middle hole is communicated with the inlet and outlet channel; the first inclined middle hole and the second inclined middle hole share a pressure bearing wall and are respectively provided with a sealing surface, a thread diameter, a square or circular top and an inner cavity hole. The device is compact in structure, high in universality and high in cost performance.

Description

Technical Field

[0001] The present invention belongs to the field of valve manufacturing, and particularly relates to a combined valve for shut-off, check, and regulation of a double Y-shaped valve body, and an operating device. Background Art

[0002] Existing Y-shaped globe valves and check valves are in the form of single valves and cannot meet the multiple sealing requirements of harsh working conditions. The welding of two valves has the disadvantages of many welds, large installation space, long construction period, high costs for weld heat treatment and non-destructive inspection. The function of a single Y-shaped globe valve is single, and there is no valve that combines a globe valve with a regulating valve and a check valve. Summary of the Invention

[0003] The present invention provides a double Y-shaped multi-functional combined valve with a compact structure, strong versatility, and high cost performance.

[0004] The technical solution of the present invention is as follows:

[0005] A compact double Y-shaped multi-functional combined valve, characterized in that: the inlet and outlet ends of the double Y-shaped valve body are coaxial, and there are a first inclined middle hole and a second inclined middle hole inclined to the axis of the inlet and outlet channels between the inlet and outlet ends. The axis of the first inclined middle hole is parallel to the axis of the second inclined middle hole and intersects with the axis of the inlet and outlet channels. The axes of the first inclined middle hole and the second inclined middle hole are inclined to the axis of the inlet and outlet channels, and the included angle α ranges from 45° to 60°; the first inclined middle hole has a valve seat hole that obliquely penetrates the inlet and outlet channels, and the second inclined middle hole has a valve seat hole that penetrates the inlet and outlet channels. The lowest point at the upper end and the highest point at the lower end of the obliquely arranged valve seat holes are both within the range of the inlet and outlet channels. There is a concave flow cavity at the lower end of the valve seat hole where the first inclined middle hole obliquely penetrates the inlet and outlet channels and the valve seat hole where the second inclined middle hole penetrates the inlet and outlet channels to ensure the flow area; the valve seat holes where the first inclined middle hole obliquely penetrates the inlet and outlet channels and the valve seat holes where the second inclined middle hole penetrates the inlet and outlet channels are processed with sealing surfaces by the method of the valve body or surfacing, or are in the form of threads or tapers to install valve seats; the first inclined middle hole and the second inclined middle hole have a common pressure-bearing wall and have their respective sealing surfaces, thread diameters, square or round tops, and inner cavity holes; the end of the valve body is a welded end or a flange, and the flange or welded end hole is processed into a hole suitable for installing an inclined disc check valve inside or a hole suitable for installing an axial flow check valve or a through hole without installing an end check valve;

[0006] For valve seats with non-body-sealed replaceable ones, there are two structures, namely threads and tapers, for connecting with the valve seat holes. The inclined disc check valve only uses a taper to connect with the valve seat. A common valve seat is used for a common globe valve or a globe valve with an anti-noise mesh cover or a lift check valve or a ball check valve. A cylindrical valve seat is used for a multi-stage regulating valve. An axial flow check valve uses a valve body or an inserted ring valve seat;

[0007] The valve discs that form a sealing pair with the valve seat include the valve discs of ordinary globe valves, tilting disc check valves, multi-stage regulating valves, stop check valves and lift check valves, needle globe valve discs, ball discs, and axial flow check valve discs;

[0008] The forms of the valve rod heads that control the movement of the valve discs include the valve rod of a globe valve with a hook head, the valve rod of a stop check valve without a shoulder at the head, the valve rod of a regulating valve with a connecting hole at the head, and the pin shaft of a tilting disc check valve;

[0009] The valve covers are divided into perforated valve covers and blind hole valve covers. The perforated valve covers are used for globe valves, needle valves, stop check valves or regulating valves, and the blind hole valve covers are used for lift check valves, ball check valves and tilting disc check valves; The axial flow check valve with a flow guide cover at the inlet and outlet channels and valve rod positioning uses a valve disc cover;

[0010] The anti-noise mesh cover is used for anti-noise and anti-scouring working conditions and is installed in the inner cavity hole of the second inclined middle hole;

[0011] For the valve seat of a multi-stage regulating valve, a small conical surface is used to cooperate with the valve seat hole of the valve body for sealing. The valve seat inlet hole, sealing conical surface, sealing surface outlet hole, the first and second valve seat partitions, and the surface of the end partition are evenly distributed with valve seat circumferential holes for the medium to flow out of the valve seat; The valve disc of the multi-stage regulating valve has an outer diameter surface of the inlet end cylinder that cooperates with the valve seat inlet hole, a sealing conical surface, and there is a narrow groove between the outer diameter and the sealing conical surface. There are two groups of small holes in the inlet end cylinder, and a group of small holes near the sealing surface partially fall within the width range of the narrow groove to form an arcuate small hole area; There is a first valve disc spacer ring that cooperates with the valve seat sealing surface outlet hole, second and third valve disc spacer rings that respectively cooperate with the first and second valve seat partitions, and a valve disc end spacer ring that cooperates with the valve seat end partition. The spacing distances between the valve seat partitions and the valve disc spacer rings are equal. The outer cylindrical surface of the valve disc spacer ring has a labyrinth seal groove. There is a group of deep labyrinth grooves between the first valve disc spacer ring and the second valve disc spacer ring. The first valve disc spacer ring and the third valve disc spacer ring are processed with evenly distributed small straight holes. The second valve disc spacer ring is processed with evenly distributed small inclined holes. The valve disc end spacer ring is a cylindrical structure. There is a diversion groove on the outer diameter of the cylinder. The groove width of the diversion groove is greater than the diameter of the valve seat circumferential hole. There are evenly distributed circumferential holes in the groove, and the diameter of the circumferential hole is smaller than the diameter of the valve seat circumferential hole and the number is more than the number of the valve seat circumferential holes; There are evenly distributed axial holes on the inner end surface of the cylinder, and the number of the axial holes is less than that of the circumferential holes. The axial holes communicate with the grooves between the third valve disc spacer ring and the valve disc end spacer ring; There is a hole in the middle of the valve disc that cooperates with the valve rod. There is a pin hole connecting with the valve rod between the second valve disc spacer ring and the third valve disc spacer ring. The position of the pin hole ensures that the end of the valve rod contacts the bottom of the middle hole of the valve disc when closed. The valve disc is movably connected to the valve rod by a pin, and the multi-stage regulating valve is controlled by the valve rod;

[0012] The sealing rings, screw caps, packing, pressing plate flanges, packing sleeves, packing pressing plates, tightening bolts, nuts, indicating blocks and valve body valve covers form the valve body sealing and valve rod sealing systems.

[0013] The conical surface of the valve seat of the inclined flap check valve has a small-angle conical surface that fits and seals with the valve seat hole of the valve body and a large-angle conical surface for thrust sealing. There are two lugs on the outer circle of the valve seat, and there are two pin holes on the lugs with axial eccentricity a and radial eccentricity b relative to the sealing conical surface. The sealing conical surface of the valve flap of the inclined flap check valve coincides with the sealing conical surface of the valve seat, and the positions of the pin holes with the same axial eccentricity a and radial eccentricity b are the same as those of the valve seat outer diameter envelope surface and have the same radial eccentricity b. The pin shaft is the same as the valve seat outer diameter envelope surface and has the same radial eccentricity b. There is a side inclined groove on the bottom surface of the valve flap, and the bottom surface of the groove is parallel to the top surface of the valve flap. The valve flap is equipped with two torsion springs symmetrically on the side faces perpendicular to the pin holes, located between the two side faces of the valve flap and the arc lugs of the valve seat. The two extended ends of the torsion spring are respectively in contact with the bottom surface of the valve seat lug and the bottom surface of the valve flap side, so that the valve flap can automatically reset and seal.

[0014] In addition, there is a support rod. One end of the support rod is connected to the installation screw hole at the top of the valve body by thread, and the other end of the support rod has a threaded hole; the distribution diameter of the four equal-part connection holes of the gearbox seat conforms to the ISO 5210 standard. The connection holes are of two forms: through holes and threaded through holes. The gearbox body has screw through holes for connecting with the gearbox seat; for the installation screw holes at the top of the valve body that conform to the ISO5210 standard, long screws pass through the gearbox body, and the gearbox seat is connected and fixed to the support rod; for the four equal-part installation screw hole dimensions at the top of the valve body that do not conform to the ISO 5210 standard, the transition adapter plate is fixed on the support rod by screws. The screws pass through the eight equal-part bolt holes of the transition adapter plate and are connected to the gearbox seat, and the screws pass through the gearbox body and are connected to the four equal-part threaded holes on the gearbox seat to form an integral gear operating device; the axial force of the valve stem is transmitted to the valve stem nut. There is a thin flat needle bearing on each of the upper and lower shoulders of the valve stem nut. The valve stem nut assembly is fixed in the gearbox seat by a threaded bearing cover, so that the gearbox body does not bear the axial force of the valve stem. The threaded bearing cover is locked with a set screw. The head of the valve stem nut has a hexagonal surface or keyway surface for transmitting torque, which is matched with the hexagonal or keyway surface of the spiral bevel gear disc. The O-rings at both ends of the valve stem nut seal the operating device. The spiral bevel gear disc is connected to the gearbox seat through bearings and is axially fixed by the inner hollow shaft end of the gearbox body. Medium and heavy roller bearings are installed on the spiral gear shaft that is orthogonally meshed with the spiral bevel gear disc. There is a spacer between the two bearings. The bearings and the spacer are axially fixed on the spiral gear shaft by a snap ring. Most of the heavy roller bearings are fixed in the holes of the gearbox body, leaving a part for positioning the bearing cover, and the spiral gear shaft and the bearings are fixed to the gearbox body by screws, nuts and bearing covers. There are 4 symmetrically distributed non-uniform lock holes with a small angle of 30 degrees adjacent to each other on the bearing cover. The hole groove of the three-jaw impact block is key-connected to the spiral gear shaft. The swing angle between the handwheel with three equal-part inner claws and the impact block is greater than 30 degrees. When hitting, the gear operating mechanism outputs a large instantaneous torque. A locking piece is set on the handwheel to lock the handwheel operating position. The central pitch circle diameter of the six equal-part of the locking piece is equal to the diameter of the four lock holes on the bearing cover to realize handwheel locking;

[0015] For a two-stage transmission operating device with a larger output torque, remove the bearing cover of the first-stage reduction spiral bevel gear operating device and replace it with an internal gear housing. The two ends of the housing are respectively fitted with heavy-duty roller bearings and a planetary reduction gearbox cover. The planetary reduction mechanism is fixed through screws and nuts to the four equally divided connecting holes at the input end of the gear housing. The head size of the sun gear input shaft of the planetary reduction mechanism is the same as that of the helical tooth shaft, and a three-jaw impact block and an internal three-jaw impact handwheel are installed. The planet carrier for fixing the planet gears is a combined structure, consisting of a planet carrier seat, a planet carrier plate, 6 spacers, 6 screws, and 6 lock nuts. The planet carrier seat is key-connected to the helical tooth shaft. There are two groups of equally distributed holes with different center distances on the planet carrier seat, and the holes with two different center distances are respectively installed with sun gears and planet gears with different numbers of teeth. Under the condition that other parts remain unchanged, two reduction ratios are achieved; the planet carrier plate has two groups of equally divided threaded holes corresponding to the planet carrier seat. The screws fasten the planet carrier seat through the 6 spacers in the middle to the threaded holes on the planet carrier plate, and are fastened by lock nuts. The planet gears are fitted with the spacers and are fixed between the planet carrier seat and the planet carrier plate. Four arc grooves with a center distance equal to the threaded holes at the input end of the gear housing can be machined on the outer circle of the internal gear housing. A transition connector with internal and external threads and the same diameter as the arc grooves is connected to the threaded holes at the input end of the gear housing. The outer circle of the connector positions and prevents rotation of the arc grooves of the internal gear housing. The screws fix the planetary reduction gearbox cover, the internal gear housing, and the entire planetary reduction mechanism to the gear housing through the connector to form a two-stage reduction valve operating device;

[0016] For a large-size dome valve body double Y-type globe valve, its two-stage reduction operating device has a circular gear housing and a gearbox seat. There are full-thread through holes on the gearbox seat that conform to the indexing dimensions of ISO 5210 standard. The screws pass through the connecting flange of the gear housing and are connected and fastened to the upper part of the full-thread through holes of the gearbox seat. The bracket is connected and fastened to the lower part of the full-thread through holes of the gearbox seat with bolts. The stud and nut fix the bracket to the top of the valve body; the nut shaft has a coarse-thread hole for connecting with the valve stem nut and a fine-thread hole for connecting with the locking ring of the valve stem nut. Threads with different pitches connect and lock the valve stem nut and the nut shaft. When the coarse thread of the nut shaft and the valve stem nut uses a key or spline, the fine thread for connecting with the two locking rings is still maintained; two flat needle roller bearings are installed on the upper and lower surfaces of the shoulder of the nut shaft. The flat needle roller bearings and the nut shaft are fixed in the gearbox seat by a threaded cover. Remove the planetary reduction device of the two-stage reduction gear operating device and install a bearing cover to form a first-stage reduction spiral bevel gear operating device.

[0017] For small valves without a gear operating device, a small-bore high-low handwheel-operated compact double globe valve is adopted. The valve stems, valve stem nuts, bearings, guiding and indicating blocks, support plates, O-rings, and dust-proof plates in the two sets of sealing operating systems of the double Y-type globe valve are the same; the long handle has a thread for connecting to the valve stem nut; the high handwheel operating system installs a spacer sleeve with the same hexagonal hole and thickness as the handwheel 44 on the valve stem nut, and a locking gasket is installed between the long handle and the spacer sleeve. Rotate the handwheel to control the two sets of sealing systems respectively.

[0018] The connection method of the compact double Y-type multi-functional combined valve is flange at both ends, welding at both ends, or welding at one end and flange at the other end. The valve disc form of the globe valve is parabolic. The number of stages of the valve seat and valve disc of the multi-stage regulating valve can be increased or decreased. The valve cover form is bolt connection, high-low temperature extension, or bellows. The operating device is pneumatic, electric, or other operating structures.

[0019] The present invention has the following advantages:

[0020] The compact double Y-type multi-functional combined valve has a compact structure, a small installation space, is easy to manufacture, has less emissions, is green and environmentally friendly, has no welds for multi-valve connection, has a short construction period, and low costs for weld heat treatment and inspection.

[0021] The internal parts and elements of the double Y-type valve can be conveniently processed and installed for specific valve functions and valve types according to the requirements of the pipeline system, and more than a hundred valve types can be combined. The combination of the compact double Y-type valve body structure and the square gear operating device with the required functional internal parts solves the long-term problem that no one has wanted to involve of realizing a variety of cut-off, regulating, and check triple-sealing combined valves in the same valve stem plane and direction of a valve body. The internal parts and structure of the double Y-type multi-functional combined valve can be used with conventional single Y-type valves to form various Y-type valves with or without check valves, with strong versatility and high cost performance.

[0022] The integral inclined disc check valve component composed of a valve seat, a valve disc, and a pin shaft torsion spring has a simple and compact structure, is easy to install, and can form various high-cost performance inclined plate check valves of Y-type, straight-through type, and wafer type.

[0023] The multi-stage regulating valve has a function of small flow fine-tuning and transitional protection between small flow and large flow regulation. The circumferential small holes at the inlet and outlet of the multi-stage valve disc improve the noise reduction and erosion resistance performance.

[0024] The gear operating device composed of a square gear box body and a square gear box seat has small structural dimensions and is applicable to a compact integrated double-Y valve body structure. The gear operating device formed by the combination of a square gear box body and a circular gear box seat and the combination of a circular gear box body and a box seat has a wide range of applications. The axial force of the valve stem (medium force) does not act on the gear box body. The gear box seat is directly connected to the support rod without a flange plate. The valve stem nut is directly connected to the spiral bevel gear disc. It has fewer parts, high cost performance, a large output torque when the input shaft impacts the handwheel, and is convenient for handwheel locking. For the positions of the two groups of fixed holes on the planet carrier in the planetary reduction device, a two-stage reduction operating device with different speed ratios can be conveniently realized by replacing the sun gear and the planet gear. Description of the Drawings

[0025] The present invention will be further described below in conjunction with the drawings and embodiments.

[0026] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0027] Figure 2 is Figure 1 Another perspective sectional view.

[0028] Figure 3 It is a schematic diagram of the valve body with a flange of the present invention.

[0029] Figure 4 It is a schematic diagram of the barrel valve seat of a multi-stage regulating valve.

[0030] Figure 5 It is a schematic diagram of the valve flap of a multi-stage regulating valve.

[0031] Figure 6 It is a schematic diagram of a double-Y globe valve plus a swing check valve with an inclined valve flap at the outlet end.

[0032] Figure 7 It is a schematic diagram of a double-Y globe valve plus a Y-type stop check valve.

[0033] Figure 8 It is a schematic diagram of an anti-noise double-Y globe valve.

[0034] Figure 9 It is a schematic diagram of a single-Y anti-noise needle valve plus a swing check valve with an inclined valve flap.

[0035] Figure 10 It is a schematic diagram of a Y-type check valve plus a Y-type swing check valve with an inclined valve flap.

[0036] Figure 11 It is a schematic diagram of a ball check valve plus a lift check valve.

[0037] Figure 12 It is a schematic diagram of a double-Y double swing check valve.

[0038] Figure 13It is a schematic diagram of the slightly open position of a Y-type needle valve and a Y-type regulating valve.

[0039] Figure 14 It is a schematic diagram of a double Y-type needle valve, an anti-noise lift check valve, and an inclined flap check valve.

[0040] Figure 15 It is a schematic diagram of the open position of a Y-type anti-noise needle valve and a Y-type regulating valve.

[0041] Figure 16 It is a schematic diagram of a Y-type stop valve and a double inclined flap check valve.

[0042] Figure 17 It is Figure 16 a partial enlarged view of.

[0043] Figure 18 It is a stop valve, an inclined flap, and an axial flow check valve.

[0044] Figure 19 It is a large-size dome valve body and a double Y-type stop valve with a circular gearbox seat.

[0045] Figure 20 It is a schematic diagram of a double Y-type stop valve with a small-caliber high-low handwheel operation. Specific implementation mode

[0046] A compact double Y-type multi-functional combined valve. The inlet and outlet ends of the double Y-type valve body 1 are coaxial, and the axis 001 of the inlet and outlet passage 01. There is a first inclined middle hole 02 and a second inclined middle hole 03 inclined to the axis 001 between the inlet and outlet ends. The axis of the first inclined middle hole is 002, and the axis of the second inclined middle hole is 003. 002 and 003 are parallel and intersect with 001. The axes 002 and 003 are inclined to the axis 001, and the included angle α ranges from 45° to 60°. The valve seat hole 012 where the middle hole 02 is obliquely intersected with the passage 01, and the valve seat hole 013 where the middle hole 03 is intersected with the passage 01. The lowest point at the upper end and the highest point at the lower end of the obliquely arranged valve seat hole are both within the range of the passage 01. There is a concave flow cavity at the lower ends of the valve seat holes 012 and 013 to ensure the flow area; the valve seat holes 012 and 013 can be processed with sealing surfaces by the method of the body or surfacing, or can be processed into threaded or tapered surface forms to install valve seats; the first inclined middle hole and the second inclined middle hole have a common pressure-bearing wall 04; and have their respective sealing surfaces D, thread diameters M, square or circular tops P, inner cavity holes D2, D3; there are four equally distributed mounting screw holes Z along the axes 002 and 003 at the top. When the middle hole is used for a lift check valve ball flap check valve or an inclined flap check valve, the top screw holes do not need to be processed. The end of the valve body 1 is a welded end or a flange. The flange or welded end hole can be processed into a hole T4 suitable for installing an internal inclined flap check valve, or a hole A4 suitable for installing an axial flow check valve, or a through hole without installing an end check valve.

[0047] For valve seats that are not integrally sealed and can be replaced, there are two structures, namely threaded and tapered surfaces, for connecting to valve seat holes 012 and 013. The tilting disc check valve only uses the tapered surface to connect to valve seat 202. The general stop valve, or the stop valve with a noise-resistant mesh cover, or the lift check valve and ball disc check valve use the general valve seat 2. The multi-stage regulating valve uses the cylindrical valve seat 201. The axial flow check valve seat (integral or ring insert) is 206.

[0048] The valve discs that form a sealing pair with the valve seats include the stop valve disc 3, the tilting disc check valve disc 302, the multi-stage regulating valve disc 301, the stop check valve and lift check valve disc 303, the needle valve stop valve disc 304, the ball disc 310, and the axial flow check valve disc 306.

[0049] The forms of the valve rod heads that control the movement of the valve discs include the stop valve rod 4 with a hook head, the stop check valve rod 403 without a shoulder at the head, the regulating valve rod 401 with a connection hole at the head, and the tilting disc check valve pin 402.

[0050] The valve covers are divided into the perforated valve cover 5 and the blind hole valve cover 501. The perforated valve cover 5 is used for stop valves, needle valves, stop check valves, and regulating valves. The blind hole valve cover 501 is used for piston check valves, ball check valves, and tilting disc check valves. The axial flow check valve disc cover 506 with a flow guide cover and valve rod positioning for the inlet and outlet channels.

[0051] The noise-resistant mesh cover 6 is used for noise-resistant and erosion-proof working conditions and is installed in the slightly larger inner cavity hole D3. Sealing rings 7, screw caps 8, 801, packing 9, flange for pressing plate 10, packing gland 11, packing pressing plate 12, tightening bolts 13, nuts 14, indicating blocks 15, etc. together with the valve body and valve cover form the valve body sealing and valve rod sealing system 500.

[0052] By using different forms of valve seats, valve discs, valve rods, and valve covers, and combining them with a mesh cover, different functions can be achieved. Table 1 shows some of the combined valves that can be formed with the same valve body and their main functions.

[0053] Table 1 Composition of Internal Parts and Main Functions of Typical Double Y-shaped Valve Body Combined Valves

[0054]

[0055]

[0056] The valve types and functions listed in Table 1 are only a small part of the combinations. Valve types with other functions can be combined and expanded as needed. When a tilting disc or axial flow check valve is installed at the outlet end port, the number of valve types of the combined valve doubles.

[0057] Furthermore, when the double Y-shaped valve body is simplified to a single Y-shaped valve body 101, the parts that can be installed in the middle cavity of the Y shape are the same as the corresponding parts above, and the parts that can be installed at the outlet end port are the same as the tilting disc or axial flow check valve above, forming the valve types of the combined valve in Table (2).

[0058] Table 2 Valve Types and Parts of the Combined Valve of Single Y-Type Valve Body and Check Valve at the Outlet End

[0059]

[0060]

[0061] The seat 202 of the tilting disc check valve has a small-angle conical surface that fits and seals with the seat hole of the valve body and a large-angle conical surface for thrust sealing. There are two lugs on the outer circle of the seat, and there are pin holes C on the lugs with axial eccentricity a and radial eccentricity b relative to the sealing conical surface MZ. The sealing conical surface MB of the tilting disc 302 of the tilting disc check valve coincides with the sealing conical surface of the seat and has the same position of the pin hole C with axial eccentricity a and radial eccentricity b. The pin 402 has the same outer diameter envelope surface as the seat and the same radial eccentricity b, which maintains the position of the seat and the disc. The disc with a butterfly cross-section has the characteristic of low flow resistance. There is a side inclined groove on the bottom surface of the disc, and the bottom surface of the groove is parallel to the top surface of the disc. This inclined groove increases the eccentric moment beneficial to sealing when the disc closes. The disc is equipped with two symmetric torsion springs perpendicular to the pin holes C on the two side faces, located between the two side faces of the disc and the arc-shaped lugs of the seat. The two extended ends of the torsion spring are respectively in contact with the bottom surface of the seat lug and the bottom surface of the disc side face, enabling the disc to automatically reset and seal. The two protruding arc-shaped lugs and the central position on the seat can be designed to meet the requirements of a triple eccentric check valve. The two-eccentric or triple-eccentric tilting disc check valve component composed of the seat, the disc and the pin torsion spring has a simple and compact structure and can be assembled with Y-type, straight-through type and wafer-type valve bodies to form various non-penetrating high-performance-price ratio tilting disc check valves.

[0062] The valve seat 201 of the multi-stage regulating valve has a small conical surface Z201 that mates and seals with the valve seat hole 012 (or 013) of the valve body, an inlet hole R201, a sealing conical surface M201, a sealing surface outlet hole C201, partitions G1, G2, and the surface of the end partition D201 is evenly distributed with circumferential holes n201 for the medium to flow out of the valve seat. The valve flap 301 of the multi-stage regulating valve has an outer diameter surface R301 of the inlet end cylinder that mates with the inlet hole R201 of the valve seat, a sealing conical surface M301, and there is a narrow groove b301 between the outer diameter R301 and the sealing conical surface M301. The inlet end cylinder has two groups of small holes e301, and a group of small holes near the sealing surface partially fall within the width range of the narrow groove to form an arcuate small hole area; a spacer ring C301 that mates with the sealing surface outlet hole C201 of the valve seat, spacer rings G11, G22 that mate with the valve seat partitions G1, G2, and an end spacer ring D301 that mates with the valve seat end partition D201. The spacing distances between the valve seat partitions and the valve flap spacer rings are equal. The outer circular surfaces of the valve flap spacer rings C301, G11, G22 have labyrinth sealing grooves. There is a group of deep labyrinth grooves between the spacer ring C301 and G11. The partitions C301, G22 are machined with evenly distributed small straight holes K301, K22, and the spacer ring G11 is machined with evenly distributed small inclined holes K11. The valve flap end spacer ring D301 is of a cylindrical structure. There is a diversion groove on the outer diameter of the cylinder. The groove width of the diversion groove is greater than the diameter of the circumferential hole n201 of the valve seat. There are evenly distributed circumferential holes n301 in the groove, and the diameter of n301 is smaller than n201, and the number is more than the small holes n201 of the valve seat. There are evenly distributed axial holes z301 on the inner end surface of the cylinder, and the number of axial holes z301 is less than that of the circumferential holes n301. The axial holes z301 communicate with the groove between the spacer ring G22 and the end spacer ring D301; there is a hole d301 in the middle of the valve flap that mates with the valve stem 401. There is a pin hole X301 connecting with the valve stem 401 between the spacer rings G11 and G22 of the valve flap. The position of the pin hole ensures that the end of the valve stem contacts the bottom of the middle hole of the valve flap when closed. The valve flap 301 is movably connected to the valve stem 401 through a pin 407, and the multi-stage regulating valve is controlled by the valve stem.

[0063] Further, in the slightly opened state of the multi-stage regulating valve, between the valve seat sealing surface M201 and the valve flap sealing surface M301, the area where the medium flows in is the arcuate flow-through surface of the small holes e301 in the valve flap inlet end hole. After bending through the sealing surface, it is blocked and passes through the small holes K301 on the spacer ring C301, diffuses to the front chamber and is then blocked and passes through the inclined small holes K11 of the spacer ring G11, diffuses to the middle chamber between G11 and G22, is then blocked and passes through the small holes K22 on the spacer ring G22, diffuses to the rear chamber and bends, enters the cylinder of the valve flap end spacer ring D301 through the axial hole Z301 and the circumferential hole n301, bends and flows into the circumferential hole n201 of the valve seat that is not blocked by the valve flap end face, bends and flows into the ring formed by the middle cavity hole of the outer circular surface of the valve seat and the valve body, and then bends and finally flows out of the outlet end of the valve. Through the compression and diffusion of the variable-flow multi-stage small holes for inflow and outflow, the area transformation and bending between the mesh holes and the grooves, it adapts to the regulation of high pressure difference and small flow rate.

[0064] Furthermore, in the semi-open state of the multi-stage regulating valve, the medium flows from a group of circumferential small holes e301 in the cylinder at the inlet end of the valve flap into turbulence, then to the circumferential small holes n201 of the valve seat and then to the outlet end of the valve body. Its flow trajectory bends at the 17th position and has a flow cross-section at the 20th position. The expansion and contraction rates between the cross-sections change with the change from the semi-open state to the fully open state. In the fully open state, the two groups of circumferential small holes e301 in the cylinder at the inlet end of the valve flap are in a fully flowing state. In the middle flow channel section (including G1, G2, G11, G22, C301), the relative positions of the valve flap spacer ring and the valve seat partition are in the middle of their respective groove widths at equal distances, and the diffusion and contraction change rate of the flow ring area is the smallest. At the fully open state of the outlet end, the center lines of different numbers of circumferential small holes n201 and n301 in the valve seat end partition D201 and the valve flap end spacer ring are aligned in the axial direction and are circumferentially misaligned. The medium blocked by the misaligned small holes enters the diversion groove through the small holes n301 on the valve flap and bends, then flows into the valve seat small holes n201, and then reaches the outlet end of the valve body through the ring between the outer circle of the valve seat and the middle cavity hole of the valve body.

[0065] One end of the support rod 16 is threadedly connected to the mounting screw hole Z at the top of the valve body, and the other end of the support rod 16 has a threaded hole; the distribution diameter of the four equally divided connection holes of the gearbox seat 17 conforms to the ISO 5210 standard, and the connection holes are in two forms: light through holes and threaded through holes. The gearbox body 18 has a flange connected to the gearbox seat 17 and screw through holes. For the mounting screw hole Z at the top of the valve body that conforms to the ISO5210 standard, the long screw 19 passes through the gearbox body 18, and the gearbox seat 17 is connected and fixed to the support rod 16. For the four equally divided mounting screw hole dimensions at the top of the valve body that do not conform to the ISO 5210 standard, the transition adapter plate 20 is fixed to the support rod 16 by the screw 1901. The screw 1902 passes through the eight equally divided bolt holes of the transition adapter plate 20 and is connected to the gearbox seat 1701. The screw 1903 passes through the gearbox body 18 and is connected to the four equally divided threaded holes on the gearbox seat 1701 to form an integral gear operating device. The axial force of the valve stem 4 is transmitted to the valve stem nut 21. One plane needle roller bearing 22 is installed on each of the upper and lower shoulders of the valve stem nut 21. The valve stem nut assembly is fixed in the gearbox seat 17 by the threaded bearing cover 23, so that the gearbox body does not bear the axial force of the valve stem. The threaded bearing cover is locked with a set screw. The valve stem nut head has a hexagonal surface or keyway surface for transmitting torque, which cooperates with the hexagonal or keyway surface of the spiral bevel gear disk 24. The O-ring at both ends of the valve stem nut seals the operating device. The spiral bevel gear disk 24 is connected to the gearbox seat 17 through the bearing 25 and is axially fixed by the inner hollow shaft end of the gearbox body 18. Medium and heavy-duty roller bearings are installed on the spiral gear shaft 26 that meshes orthogonally with the spiral bevel gear disk 24. There is a spacer sleeve between the two bearings. The bearings and the spacer sleeve are axially fixed on the spiral gear shaft 26 by snap rings. Most of the heavy-duty roller bearing 32 is fixed in the hole of the gearbox body 18, leaving a part for positioning the bearing cover 27. The spiral gear shaft 26 and the components of the bearings and other parts are fixed to the gearbox body 18 by screws, nuts and the bearing cover 27. There are 4 symmetrically distributed non-uniform locking holes on the bearing cover 27 with a small angle of 30 degrees adjacent to each other. The hole groove of the three-jaw impact block 28 is key-connected to the spiral gear shaft 26. The swing angle between the handwheel 29 with three equally divided inner claws and the impact block is greater than 30 degrees. When impacted, a large instantaneous torque is output by the gear operating mechanism. A locking piece 30 is added to the handwheel 29 to lock the handwheel operating position. The center pitch circle diameter of the six equally divided locking piece is equal to the diameter of the 4 locking holes on the bearing cover 27, realizing handwheel locking. The part numbers 17 to 30 form a first-stage reduction spiral bevel gear operating device 100. The bearing cover 27 can be equipped with a pneumatic or electric drive head according to the connection form of the pneumatic or electric connection plate.

[0066] Further, for the secondary transmission operating device with a larger output torque, remove the bearing cover 27 of the primary reduction spiral bevel gear operating device 100, and replace it with an internal gear housing 31. The two ends of the housing 31 are respectively fitted with a heavy-duty roller bearing 32 and a planetary reduction gearbox cover 33. The planetary reduction mechanism is fixed through screws and nuts to the four equally divided connecting holes at the input end of the gear housing 18. The head size of the sun gear input shaft 34 of the planetary reduction mechanism is the same as that of the spiral tooth shaft 26, and a three-jaw impact block 28 and an internal three-jaw impact handwheel 29 are installed. The planet carrier for fixing the planet gears 35 is a combined structure, consisting of a planet carrier seat 36, a planet carrier plate 37, six spacers 38, six screws, and six lock nuts. The planet carrier seat 36 is key-connected to the spiral tooth shaft 26. There are two groups of equally distributed holes with different center distances on the planet carrier seat 36, and different numbers of teeth of the central gears and planet gears can be installed in the two groups of holes with different center distances respectively. Under the condition that other parts remain unchanged, two reduction ratios can be achieved. The planet carrier plate 37 has two groups of equally divided threaded holes corresponding to the planet carrier seat 36. The screws fasten the planet carrier seat 36 through the six spacers 38 in the middle to the threaded holes on the planet carrier plate 37, and are tightened by lock nuts. The planet gears 35 are fitted with the spacers 38 and are fixed between the planet carrier seat 36 and the planet carrier plate 37. Four arc grooves with the same center distance as the threaded holes at the input end of the gear housing 18 can be machined on the outer circle of the internal gear housing 31. A transition connector 39 with internal and external threads and the same diameter as the arc grooves is connected to the threaded holes at the input end of the gear housing 18. The outer circle of the connector positions and prevents the internal gear housing 31 from rotating. The screws fix the planetary reduction gearbox cover 33, the internal gear housing 31, and the entire planetary reduction mechanism to the gear housing 18 through the connector 39 to form a secondary reduction valve operating device 200. The planetary reduction gearbox cover 33 can be equipped with a pneumatic or electric drive head according to the connection form of the pneumatic or electric connection plate.

[0067] Furthermore, for the large-size dome valve body double Y-type globe valve, its secondary deceleration operating device 600 has a circular gear box body 1802 and a gear box seat 1702. The gear box seat 1702 has a full-thread through hole conforming to the indexing dimension of ISO 5210 standard. The screw 1904 passes through the connecting flange of the gear box body 1802 and is tightly connected to the upper part of the full-thread through hole of the gear box seat. The bracket 201 is tightly connected to the lower part of the full-thread through hole of the gear box seat with a bolt 1905. The stud 1906 and nut 1907 fix the bracket 201 on the top of the valve body. The nut shaft 2101 has a coarse-thread hole connected to the valve stem nut 2102 and a fine-thread hole connected to the valve stem nut locking ring 2103. Threads with different pitches connect and lock the valve stem nut and the nut shaft. When the coarse thread between the nut shaft 2101 and the valve stem nut 2102 uses a key or spline, the fine thread connected to the two locking rings 2103 is still maintained. Two flat needle roller bearings 2201 are installed on the upper and lower surfaces of the shoulder of the nut shaft 2101. The flat needle roller bearings and the nut shaft are fixed in the gear box seat 1702 by a threaded cover 2301. The gear box body does not bear the axial force of the valve stem. In the figure, 600 is the secondary deceleration gear operating device. Removing the planetary deceleration device and installing a bearing cover is the primary deceleration spiral bevel gear operating device.

[0068] Furthermore, for small valves without a gear operating device, Figure 20 a small-bore high-low handwheel-operated compact double globe valve is adopted. For the valve stem 40, valve stem nut 43, bearing 42, guiding and indicating block 415, support plate 41, O-ring 49, and dust-proof plate 50 in the two sets of sealing operating systems of the double Y-type globe valve, they are the same. The long handle 46 has a thread connected to the valve stem nut 43, a space for accommodating the opening stroke of the valve stem, a thin-diameter long rod for accommodating the operation of the handwheel 44, a square joint connected to the handwheel 48, and a locking thread. The high handwheel operating system installs a spacer sleeve 45 with the same hexagonal hole and thickness as the handwheel 44 on the valve stem nut 43. A locking gasket 47 is installed between the long handle 46 and the spacer sleeve 45. Rotating the handwheels 48 and 44 can control the two sets of sealing systems respectively.

[0069] The connection method of the described compact double Y-type multi-functional combined valve can be two-end flanges, two-end welding, or one-end welding and one-end flange. The valve disc form of the globe valve can be parabolic, the valve disc of the check valve can be spherical, and the number of stages of the valve seat and valve disc of the multi-stage regulating valve can be increased or decreased. The valve cover form can be bolt connection, high-low temperature lengthening, or bellows.

[0070] The described compact double Y-type multi-functional combined valve and its operating device can be other operating structures such as pneumatic and electric.

[0071] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or change them into equivalent embodiments by using the technical content disclosed above within the scope of the technical solution of the present invention. However, as long as it does not depart from the technical content of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments within the spirit and principle of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A compact double-Y type multi-functional combined valve, characterized in that: The inlet and outlet ends of the double-Y valve body (1) are coaxial. Between the inlet and outlet ends, there are a first inclined middle hole (02) and a second inclined middle hole (03) that are inclined with respect to the axis (001) of the inlet and outlet passage (01). The axis (002) of the first inclined middle hole is parallel to the axis (003) of the second inclined middle hole and intersects with the axis (001) of the inlet and outlet passage (01). The axis (002) of the first inclined middle hole and the axis (003) of the second inclined middle hole are inclined with respect to the axis (001) of the inlet and outlet passage (01), and the included angle α ranges from 45° to 60°; the first inclined middle hole (02) has a valve seat hole (012) that is obliquely intersected with the inlet and outlet passage (01), and the second inclined middle hole (03) has a valve seat hole (013) that is intersected with the inlet and outlet passage (01). The lowest point at the upper end and the highest point at the lower end of the obliquely arranged valve seat holes are both within the range of the inlet and outlet passage (01). The lower ends of the valve seat hole (012) where the first inclined middle hole (02) is obliquely intersected with the inlet and outlet passage (01) and the valve seat hole (013) where the second inclined middle hole (03) is intersected with the inlet and outlet passage (01) have a concave flow cavity to ensure the flow area; the valve seat holes (012) where the first inclined middle hole (02) is obliquely intersected with the inlet and outlet passage (01) and the valve seat holes (013) where the second inclined middle hole (03) is intersected with the inlet and outlet passage (01) are processed with sealing surfaces by the method of the body or surfacing, or are in the form of threads or tapered surfaces to install the valve seat; the first inclined middle hole and the second inclined middle hole have a common pressure-bearing wall (04), and have their respective sealing surfaces, thread diameters, square or round tops, and inner cavity holes; the end of the valve body (1) is a welded end or a flange, and the flange or welded end hole is processed into a hole suitable for installing an internal inclined valve flap check valve or a hole suitable for installing an axial flow check valve or a through hole without installing an end check valve; For a valve seat with non-body-sealed replaceability, it has two structures of threads and tapered surfaces to connect with the valve seat hole. The inclined flap check valve only connects the valve seat (202) with the tapered surface. A common valve seat (2) is used for a general stop valve, a stop valve with an anti-noise mesh cover, a lift check valve, or a ball flap check valve. A cylindrical valve seat (201) is used for a multi-stage regulating valve. An axial flow check valve uses a body or inlaid ring valve seat (206); The valve flaps that form a sealed pair with the valve seat include a general stop valve flap (3), an inclined flap check valve flap (302), a multi-stage regulating valve flap (301), a stop check valve and a lift check valve flap (303), a needle stop valve flap (304), a ball flap (310), and an axial flow check valve flap (306); The forms of the valve rod heads that control the movement of the valve flap include a stop valve rod (4) with a hooked head, a stop check valve rod (403) without a convex shoulder at the head, a regulating valve rod (401) with a connecting hole at the head, and an inclined flap check valve pin shaft (402); The valve covers are divided into a perforated valve cover (5) and a blind hole valve cover (501). The perforated valve cover (5) is used for a stop valve, a needle valve, a stop check valve, or a regulating valve. The blind hole valve cover (501) is used for a lift check valve, a ball flap check valve, and an inclined flap check valve; An axial flow check valve with a flow guide cover and valve rod positioning for the inlet and outlet passage uses a valve flap cover (506); The noise-resistant mesh cover (6) is used for the noise-resistant and erosion-proof working conditions and is installed in the inner cavity hole of the second inclined middle hole. The valve seat (201) of the multi-stage regulating valve has a small conical surface that fits and seals with the valve seat hole of the valve body. The valve seat inlet hole, sealing conical surface, sealing surface outlet hole, first and second valve seat partitions, and the surfaces of the end partitions are evenly distributed with valve seat circumferential holes for the medium to flow out of the valve seat. The valve flap (301) of the multi-stage regulating valve has an outer diameter surface of the inlet end cylinder that fits with the valve seat inlet hole, a sealing conical surface, and a narrow groove between the outer diameter and the sealing conical surface. The inlet end cylinder has two groups of small holes, and a group of small holes near the sealing surface partially fall within the width range of the narrow groove to form an arcuate small hole area. There are a first valve flap spacer ring that fits with the valve seat sealing surface outlet hole, second and third valve flap spacer rings that respectively fit with the first and second valve seat partitions, and a valve flap end spacer ring that fits with the valve seat end partition. The spacing distances between the valve seat partitions and the valve flap spacer rings are equal. The outer circular surface of the valve flap spacer ring has a labyrinth sealing groove. There is a group of deep labyrinth grooves between the first valve flap spacer ring and the second valve flap spacer ring. The first valve flap spacer ring and the third valve flap spacer ring are processed with evenly distributed small straight holes, the second valve flap spacer ring is processed with evenly distributed small inclined holes. The valve flap end spacer ring is a cylindrical structure, and there is a diversion groove on the outer diameter of the cylinder. The groove width of the diversion groove is greater than the diameter of the valve seat circumferential hole, and there are evenly distributed circumferential holes in the groove. The diameter of the circumferential hole is smaller than the diameter of the valve seat circumferential hole and the number is more than the number of the valve seat circumferential holes. There are evenly distributed axial holes on the inner end surface of the cylinder, and the number of the axial holes is less than that of the circumferential holes. The axial holes communicate with the groove between the third valve flap spacer ring and the valve flap end spacer ring. There is a hole in the middle of the valve flap that fits with the valve stem (401). There is a pin hole connecting with the valve stem (401) between the second valve flap spacer ring and the third valve flap spacer ring. The position of the pin hole ensures that the end of the valve stem contacts the bottom of the middle hole of the valve flap when closed. The valve flap (301) is movably connected to the valve stem (401) through a pin (407), and the multi-stage regulating valve is controlled by the valve stem. The sealing rings (7), screw caps (8, 801), packing (9), pressing plate flange (10), packing gland (11), packing pressing plate (12), tightening bolts (13), nuts (14), indicating blocks (15) and the valve body and valve cover form the valve body sealing and valve stem sealing systems.

2. The compact double-Y type multi-functional combined valve according to claim 1, wherein: The conical connection valve seat (202) of the inclined flap check valve has a small-angle conical surface that fits and seals with the valve seat hole of the valve body and a large-angle conical surface for thrust sealing. There are two lugs on the outer circle of the valve seat, and there are pin shaft holes on the lugs with axial eccentricity a and radial eccentricity b relative to the sealing conical surface. The sealing conical surface of the inclined flap check valve flap (302) coincides with the sealing conical surface of the valve seat, and the positions of the pin shaft holes have the same axial eccentricity a and radial eccentricity b. There is a pin shaft (402) with the same outer diameter envelope surface as the valve seat and the same radial eccentricity b. There is a side inclined groove on the bottom surface of the valve flap, and the bottom surface of the groove is parallel to the top surface of the valve flap. The valve flap is equipped with two symmetric torsion springs on the two side faces perpendicular to the pin shaft holes, located between the two side faces of the valve flap and the arc lugs of the valve seat. The two extended ends of the torsion spring respectively contact the bottom surface of the valve seat lug and the bottom surface of the valve flap side face, enabling the valve flap to automatically reset and seal.

3. The compact double-Y type multi-functional combined valve according to claim 1, characterized in that: There is also a support rod (16). One end of the support rod (16) is threadedly connected to the mounting screw hole at the top of the valve body, and the other end of the support rod (16) has a threaded hole; the distribution diameter of the four equally divided connection holes of the gearbox seat (17) conforms to the ISO 5210 standard, and the forms of the connection holes are two forms: light through holes and threaded through holes. The gearbox body (18) has screw passing holes for connecting with the gearbox seat (17); for the mounting screw hole at the top of the valve body that conforms to the ISO 5210 standard, a long screw (19) passes through the gearbox body (18), and the gearbox seat (17) is connected and fixed to the support rod (16); for the four equally divided mounting screw hole dimensions at the top of the valve body that do not conform to the ISO 5210 standard, a transition adapter plate (20) is fixed on the support rod (16) by a screw (1901), a screw (1902) passes through the eight equally divided bolt holes of the transition adapter plate (20) to connect with the gearbox seat (1701), and a screw (1903) passes through the gearbox body (18) to connect with the four equally divided threaded holes on the gearbox seat (1701) to form an integral gear operating device; the axial force of the valve stem (4) is transmitted to the valve stem nut (21). Thin flat needle bearings (22) are installed on the shoulders of the valve stem nut (21), one on the top and one on the bottom. The valve stem nut assembly is fixed in the gearbox seat (17) by a threaded bearing cover (23), so that the gearbox body does not bear the axial force of the valve stem. The threaded bearing cover is locked with a set screw. The head of the valve stem nut has a hexagonal surface or keyway surface for transmitting torque, which cooperates with the hexagonal or keyway surface of the spiral bevel gear disc (24). O-rings at both ends of the valve stem nut seal the operating device. The spiral bevel gear disc (24) is connected to the gearbox seat (17) through a bearing (25) and is axially fixed by the inner hollow shaft end of the gearbox body (18). Medium and heavy-duty roller bearings are installed on the spiral bevel gear shaft (26) that orthogonally meshes with the spiral gear disc (24). There is a spacer between the two bearings. The bearings and the spacer are axially fixed on the spiral bevel gear shaft (26) by snap rings. Most of the heavy-duty roller bearing (32) is fixed in the hole of the gearbox body (18), leaving a part for positioning the bearing cover (27), and the spiral bevel gear shaft (26) and the bearing are fixed to the gearbox body (18) by screws, nuts and the bearing cover (27). There are 4 symmetrically distributed non-uniform locking holes on the bearing cover (27) with a small angle of 30 degrees adjacent to each other. The hole groove of the three-jaw impact block (28) is key-connected to the spiral bevel gear shaft (26). The swing angle between the handwheel (29) with three equally divided inner claws and the impact block is greater than 30 degrees. When hitting, a relatively large instantaneous torque is output by the gear operating mechanism. A locking piece (30) is set on the handwheel (29) to lock the operating position of the handwheel. The locking piece has a center pitch circle diameter of six equal parts, which is equal to the diameter of the four locking holes on the bearing cover (27) to achieve handwheel locking; For a two-stage transmission operating device with a larger output torque, remove the bearing cover (27) of the first-stage reduction spiral bevel gear operating device (100) and replace it with an internal gear housing (31). The two ends of the housing (31) are respectively fitted with heavy-duty roller bearings (32) and a planetary reduction gearbox cover (33). Fix the planetary reduction mechanism through the four equally divided connection holes at the input end of the gear housing (18) with screws and nuts. The head size of the sun gear input shaft (34) of the planetary reduction mechanism is the same as that of the spiral tooth shaft (26), and a three-jaw impact block (28) and an internal three-jaw impact handwheel (29) are installed. The planet carrier for fixing the planet gears (35) is a combined structure, consisting of a planet carrier seat (36), a planet carrier plate (37), 6 spacers (38), 6 screws, and 6 lock nuts. The planet carrier seat (36) is key-connected to the spiral tooth shaft (26). There are two groups of equally distributed holes with different center distances on the planet carrier seat (36), and different numbers of teeth of the sun gears and planet gears are installed in the two groups of holes with different center distances. Under the condition that other parts remain unchanged, two reduction ratios are achieved; the planet carrier plate (37) has two groups of equally divided threaded holes corresponding to the planet carrier seat (36). The screws fasten the planet carrier seat (36) to the threaded holes on the planet carrier plate (37) through the 6 spacers (38) in the middle and are tightened by lock nuts. The planet gears (35) are fitted with the spacers (38) and are fixed between the planet carrier seat (36) and the planet carrier plate (37). Four arc grooves with a center distance equal to the screw holes at the input end of the gear housing (18) can be machined on the outer circle of the internal gear housing (31). A transition connector (39) with internal and external threads and the same diameter as the arc grooves is connected to the screw holes at the input end of the gear housing (18). The outer circle of the connector positions and prevents the rotation of the arc grooves of the internal gear housing (31). The screws fix the planetary reduction gearbox cover (33), the internal gear housing (31), and the entire planetary reduction mechanism to the gear housing (18) through the connector (39) to form a two-stage reduction valve operating device (200); For a large-size dome valve body double-Y globe valve, its secondary deceleration operating device (600) has a circular gear box body (1802) and a gear box seat (1702). The gear box seat (1702) has a full-thread through hole conforming to the indexing dimension of ISO 5210 standard. A screw (1904) passes through the connecting flange of the gear box body (1802) and is connected and fastened to the upper part of the full-thread through hole of the gear box seat. A bracket (201) is connected and fastened to the lower part of the full-thread through hole of the gear box seat with a bolt (1905). A stud (1906) and a nut (1907) fix the bracket (201) on the top of the valve body. The nut shaft (2101) has a coarse-thread hole connected to the valve stem nut (2102) and a fine-thread hole connected to the valve stem nut locking ring (2103). Threads with different pitches connect and lock the valve stem nut and the nut shaft. When the coarse thread of the nut shaft (2101) and the valve stem nut (2102) uses a key or a spline, the fine thread connected to the two locking rings (2103) is still maintained. Two flat needle roller bearings (2201) are installed on the upper and lower surfaces of the shoulder of the nut shaft (2101). A threaded cover (2301) fixes the flat needle roller bearings and the nut shaft in the gear box seat (1702). Remove the planetary deceleration device of the secondary deceleration gear operating device (600) and install a bearing cover to form a primary deceleration spiral bevel gear operating device.

4. The compact double-Y type multi-functional combined valve according to claim 3, characterized in that: For a small valve without a gear operating device, a small-bore high-low handwheel-operated compact double globe valve is adopted. The valve stem (40), valve stem nut (43), bearing (42), guiding and indicating block (415), support plate (41), O-ring (49), and dust-proof plate (50) in the two sets of sealing operating systems of the double-Y globe valve are the same. The long handle (46) has a thread connected to the valve stem nut (43). The high handwheel operating system installs a spacer sleeve (45) with the same hexagonal hole and thickness as the handwheel (44) on the valve stem nut (43). A locking gasket (47) is installed between the long handle (46) and the spacer sleeve (45). The rotating handwheels (48) and (44) control the two sets of sealing systems respectively.

5. The compact double-Y type multi-functional combined valve according to claim 1, characterized in that: The connection method of the compact double-Y multi-functional combined valve is flange at both ends, welding at both ends, or welding at one end and flange at the other end. The valve disc form of the globe valve is parabolic. The number of stages of the valve seat and valve disc of the multi-stage regulating valve can be increased or decreased. The valve cover form is bolt connection, high-low temperature extension, or bellows. The operating device is pneumatic, electric, or other operating structures.

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