CN103775692B - The permanent micro-resistance safety check of interior mode - Google Patents
The permanent micro-resistance safety check of interior mode Download PDFInfo
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- CN103775692B CN103775692B CN201410059609.6A CN201410059609A CN103775692B CN 103775692 B CN103775692 B CN 103775692B CN 201410059609 A CN201410059609 A CN 201410059609A CN 103775692 B CN103775692 B CN 103775692B
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- valve plate
- block
- valve
- balancing device
- rotating shaft
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
- F16K15/035—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member with a plurality of valve members
- F16K15/036—Dual valve members with hinges crossing the flow line substantially diametrical
- F16K15/038—Dual valve members with hinges crossing the flow line substantially diametrical having a common hinge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
Abstract
The permanent micro-resistance safety check of interior mode, comprise and be mounted on can seal with valve plate inlet seal circle and rotarily opening in valve body and the valve plate of closing and the valve plate counterweight balancing device be connected away from valve plate side with valve plate contiguous block in valve body by a valve plate rotating shaft and valve plate contiguous block, the valve plate contiguous block central authorities between valve plate counterweight balancing device and valve plate are valve plate rotating shaft, it is characterized in that: its valve plate counterweight balancing device of safety check that level is installed has five kinds of structures: the cross section in its vertical valve plate face of valve plate counterweight balancing device is asymmetric fan-shaped A structure, the B structure that valve plate counterweight balancing device is made up of main equilibrium block and secondary equilibrium block, the C-structure that valve plate counterweight balancing device is made up of a cambered way and a gravity block, the cross section in its vertical valve plate face of valve plate counterweight balancing device is the D structure of banana arc, the E structure that valve plate counterweight balancing device is made up of stable equilibrium block and mobile balanced block.
Description
Technical field
The present invention relates to the permanent micro-resistance safety check of interior mode, be applicable to all liq and gas medium, belong to synthetic energy-saving discharge-reducing technical field and safety check technical field.
Background technique
Safety check is in many pipe conveying procedures, for preventing the conventional valve carrying liquid or gas backflow, but existing safety check is commercially all after being backed down by liquid or gas pressure, needs the surge pressure of working fluid or gas to keep opening of check valve plate always, which consumes suitable energy and pressure drop, although the safety check valve plate had now is very thin, very light, when liquid or gas flow through in valve, pressure drop is less, power consumption is lower, but this safety check because valve plate is too thin, too light, when there is no inlet liquid or gas pressure, the sealing of valve plate is poor, the effect not having non-return had, now commercially only have the patent of invention " 201210054615.3 energy-saving micro-resistance adjustable self-balancing check valve " of uncle minister in ancient times Wei and " 201120251731.5 safety check " after opening valve plate, no longer can consume pressure drop to open to keep valve plate, but these safety check also have a shortcoming, that is exactly after the valve plate of safety check will almost be opened completely, non-resistance or micro-resistance could be realized, that is when safety check does not reach full production in production is used, this kind of micro-resistance safety check just cannot realize the function of micro-resistance, three kinds of structures of " the permanent micro-resistance safety check of 201410044392.1 self-regualting types " of five kinds of structures of the present invention and Wei Baiqing overcome this shortcoming, the any aperture opened at safety check or state, all only has small valve plate resistance or valveless plate resistance power.
Summary of the invention
The object of this invention is to provide five kinds for liquid or gas circulation can have discharge pressure at the suction flange of safety check and open valve plate to no longer consume after any opening state pressure drop to keep this valve plate opening state and automatically can close valve plate in time when the suction flange of safety check does not have discharge pressure to stop the permanent micro-resistance safety check of mode in liquid or gas backstreaming.
The permanent micro-resistance safety check of interior mode, comprise and be mounted on can seal with valve plate inlet seal circle and rotarily opening in valve body and the valve plate of closing and the valve plate counterweight balancing device be connected away from valve plate side with valve plate contiguous block in valve body by a valve plate rotating shaft and valve plate contiguous block, the valve plate contiguous block central authorities between valve plate counterweight balancing device and valve plate are valve plate rotating shaft; It is characterized in that:
1, its valve plate counterweight balancing device of safety check that level is installed has five kinds of structures: the cross section in its vertical valve plate face of valve plate counterweight balancing device is asymmetric fan-shaped A structure, the B structure that valve plate counterweight balancing device is made up of main equilibrium block and secondary equilibrium block, the C-structure that valve plate counterweight balancing device is made up of a cambered way and a gravity block, the cross section in its vertical valve plate face of valve plate counterweight balancing device is the D structure of banana arc, the E structure that valve plate counterweight balancing device is made up of stable equilibrium block and mobile balanced block, its valve plate counterweight balancing device structure of vertically arranged safety check its valve plate counterweight balancing device structure and the safety check that level is installed is identical, but the balance weight of valve plate counterweight balancing device is different.
2, five kinds of structures of its valve plate counterweight balancing device of safety check of level installation:
(1) A structure valve plate counterweight balancing device, the cross section comprising one piece of vertical valve plate face is asymmetric fan-shaped A constitutional balance block, A constitutional balance block is arranged on valve plate contiguous block away from valve plate one end, the angle α that A constitutional balance block forms towards side and the valve plate plane of valve import side, the angle β formed towards side and the valve plate plane of valve outlet port side than A constitutional balance block is little 3 ° ~ and 15 °, and 0 °≤α≤20 °, 3 °≤β≤35 °, make valve plate when plumbness and valve plate are with valve plate inlet seal circle phase sealing state, the fan section of A structure valve plate counterweight balancing device to the gravity of valve outlet port side slightly larger than the gravity to valve import side, thus make A structure valve plate counterweight balancing device that a less power can be had valve plate to be pressed to valve plate inlet seal circle, and form certain sealing, also have two kinds of other structures in addition, one is α=0 °, β=0 °, but the center of gravity of this A structure valve plate counterweight balancing device is at valve plate plane deflection valve outlet port side 2mm ~ 100mm, two is that A structure valve plate counterweight balancing device compares near valve plate contiguous block one end away from the large sector structure in valve plate contiguous block one end, and the center of gravity meeting A structure valve plate counterweight balancing device is equally partial to valve outlet port side 2mm ~ 100mm in valve plate plane, when valve plate is backed down certain angle by the atmospheric pressure of valve import or hydraulic coupling, valve plate and A structure valve plate counterweight balancing device form leverage, but this leverage does not reach balance, but still have the less valve plate that can make to be returned to the leverage of closed condition, because the leverage relative to valve plate rotating shaft that the leverage of this return action produces much smaller than valve plate in valve plate opening process, therefore, this safety check is very energy-conservation, the check valve body structural modification of A structure valve plate counterweight balancing device is less, the space on the upside of by valve plate is only had to strengthen, thus make A structure valve plate counterweight balancing device have the space that can rotate 0 ° ~ 90 ° with the opening and closing of valve plate around valve plate rotating shaft, simultaneously the upper flange of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange and outlet(discharge) flange are constant.
(2) B structure valve plate counterweight balancing device, comprise one piece of main equilibrium block and one piece of secondary equilibrium block composition B structure valve plate counterweight balancing device, the main equilibrium block of B structure and the secondary equilibrium block of B structure are with being arranged on valve plate contiguous block away from valve plate one end, the main equilibrium block of B structure is arranged on towards valve import side, the secondary equilibrium block of B structure is arranged on towards valve outlet port side, the main equilibrium block of B structure is fixedly connected with valve plate contiguous block, the secondary equilibrium block of B structure is connected with valve plate contiguous block by the secondary equilibrium block rotating shaft of a B structure, the secondary equilibrium block of B structure can do a low-angle rotation around the secondary equilibrium block rotating shaft of B structure, 2 °≤≤ 15 °, namely after turning clockwise the angle of from the position being fitted in the main equilibrium block of B structure, be installed in the secondary equilibrium block baffle plate of the B structure of valve plate contiguous block near valve outlet port side block and stop, when valve plate is in plumbness and valve plate is in closed condition, the main equilibrium block of B structure and the secondary equilibrium block of B structure, be positioned at the positive upside of valve plate and the secondary equilibrium block of B structure abuts in the secondary equilibrium block baffle position of B structure near the secondary equilibrium block rotating shaft position of B structure, namely now the secondary equilibrium block of B structure is separated a maximum angle with the main equilibrium block of B structure: 2 ° ~ 15 °, when valve plate is opened, along with valve plate is around the increase of valve plate rotating shaft rotated counterclockwise by angle, along with valve plate is while valve plate rotating shaft rotates, the secondary equilibrium block of the main equilibrium block of B structure and B structure does and being rotated counterclockwise of valve plate same angular velocity around valve plate rotating shaft, and when valve plate reaches around valve plate rotating shaft rotated counterclockwise by angle the maximum angle that the secondary equilibrium block of B structure is separated with the main equilibrium block of B structure, namely when the focus point of the secondary equilibrium block of B structure crosses the vertical line of valve plate spindle central point, the secondary equilibrium block of B structure under gravity, be rotated counterclockwise the position overlapped with the main equilibrium block of B structure fast, and then being rotated counterclockwise of same angular velocity is done with valve plate around valve plate rotating shaft together with the main equilibrium block of B structure, until valve plate is opened to maximum opening angle, in valve plate closing process, when the valve plate being opened to maximum position is progressively closed, valve plate does clockwise direction and rotates, the main equilibrium block of B structure and the secondary equilibrium block of B structure do around valve plate rotating shaft and rotate with angular velocity with valve plate, when the secondary equilibrium block of B structure crosses the vertical line of valve plate spindle central point around the focus point that valve plate rotating shaft rotates to the secondary equilibrium block of B structure, the secondary equilibrium block of B structure is rotating simultaneously around valve plate rotating shaft, rotate to around the secondary equilibrium block rotating shaft of B structure at once under gravity and blocked by the secondary equilibrium block baffle plate of B structure, then continue the dextrorotation with valve plate then rotate around valve plate rotating shaft, until valve plate is closed completely, when valve plate is when plumbness and valve plate are with valve plate inlet seal circle phase sealing state, the main equilibrium block of B structure is directly over vertical valve plate, the secondary equilibrium block of B structure then becomes maximum 2 ° ~ 15 ° angles to tilt to valve outlet port direction with the main equilibrium block of B structure, now the secondary equilibrium block of the main equilibrium block of B structure and B structure forms gravity to valve outlet port side slightly larger than the gravity to valve import side, thus make B structure valve plate counterweight balancing device that a less power can be had valve plate to be pressed to valve plate inlet seal circle, and form certain sealing, when valve plate is backed down certain angle by the atmospheric pressure of valve import or hydraulic coupling, valve plate and B structure valve plate counterweight balancing device form leverage, but this leverage does not reach balance, but still have the less valve plate that can make to be returned to the leverage of closed condition, because the leverage relative to valve plate rotating shaft that the leverage of this return action produces much smaller than valve plate in valve plate opening process, therefore, this safety check is very energy-conservation, the check valve body structural modification of B structure valve plate counterweight balancing device is less, the space on the upside of by valve plate is only had to strengthen, thus make B structure valve plate counterweight balancing device have the space that can rotate 0 ° ~ 90 ° with the opening and closing of valve plate around valve plate rotating shaft, simultaneously the upper flange of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange and outlet(discharge) flange are constant.
(3) C-structure valve plate counterweight balancing device, comprise a C-structure cambered way, one piece of C-structure gravity block and a pull bar, C-structure cambered way is fixedly mounted on valve plate contiguous block away from valve plate one end, the jointing of C-structure cambered way and valve plate contiguous block is perpendicular to valve plate contiguous block, the arc of C-structure cambered way epimere bends towards valve outlet port, a slideway is had in the middle of C-structure cambered way, a C-structure gravity block supporting axle is passed in the position that the central authorities of C-structure gravity block are on the upper side, what supporting axle can rotate to make gravity block in cambered way moving process, keep gravity block in gravity block naturally droops state, the two ends of C-structure gravity block supporting axle are stuck on C-structure cambered way can move along cambered way, C-structure gravity block supporting axle is respectively connected with a pull bar through the two ends after C-structure cambered way, the other end of two pull bars is connected to both sides, stage casing, C-structure valve plate counterweight balancing device rotary moveable region above valve inducer, with valve plate rotating shaft in same level position but distance valve plate rotating shaft is the position of 30mm ~ 500 mm, the joint, two ends of two pull bars is axle and connects, and all can rotate around coupling shaft, when progressively opening when valve plate and be rotated counterclockwise around valve plate rotating shaft, drive and valve plate do same angular velocity by the C-structure cambered way that valve plate contiguous block is fixedly linked and rotate, due to the effect of two pull bars, while C-structure cambered way does the rotation of same angular velocity, C-structure gravity block is pushed to C-structure cambered way and is moved away from valve plate contiguous block direction by two pull bars, thus constantly increase the leverage of C-structure gravity block relative to valve plate rotating shaft, but along with valve plate opens the increase doing rotated counterclockwise by angle, valve plate also constantly increases relative to the leverage of valve plate rotating shaft, ever-increasing C-structure gravity block is made to be slightly less than the leverage of valve plate relative to valve plate rotating shaft of constantly increase all the time relative to the leverage of valve plate rotating shaft, thus make valve plate under any opening state, have the less valve plate that can make to be in the active force being returned to closed condition position all the time, because the leverage relative to valve plate rotating shaft that the leverage of this return action produces much smaller than valve plate in valve plate opening process, therefore, this safety check is very energy-conservation, the check valve body structural modification of C-structure valve plate counterweight balancing device is less, the space on the upside of by valve plate is only had to strengthen, thus make C-structure valve plate counterweight balancing device have the space that can rotate 0 ° ~ 90 ° with the opening and closing of valve plate around valve plate rotating shaft, simultaneously the upper flange of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange and outlet(discharge) flange are constant.
(4) D structure valve plate counterweight balancing device, the cross section comprising one piece of vertical valve plate face is the D structure arc equilibrium block of banana arc, D structure arc equilibrium block is arranged on valve plate contiguous block away from valve plate one end, D structure arc equilibrium block has a banana arc to bend towards valve outlet port, make when valve plate plumbness and valve plate are with valve plate inlet seal circle phase sealing state, the center of gravity of D structure arc equilibrium block moves apart valve plate central axis, 5 mm ~ 50mm are offset to valve outlet port, thus make valve plate when plumbness and valve plate are with valve plate inlet seal circle phase sealing state, a less power can be had valve plate to be pressed to valve plate inlet seal circle, and form certain sealing, when valve plate is backed down certain angle by the atmospheric pressure of valve import or hydraulic coupling, valve plate and D structure valve plate counterweight balancing device form leverage, but this leverage does not reach balance, but still have the less valve plate that can make to be returned to the leverage of closed condition, because the leverage relative to valve plate rotating shaft that the leverage of this return action produces much smaller than valve plate in valve plate opening process, therefore, this safety check is very energy-conservation, the check valve body structural modification of D structure valve plate counterweight balancing device is less, the space on the upside of by valve plate is only had to strengthen, thus make D structure valve plate counterweight balancing device have the space that can rotate 0 ° ~ 90 ° with the opening and closing of valve plate around valve plate rotating shaft, simultaneously the upper flange of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange and outlet(discharge) flange are constant.
(5) E structure valve plate counterweight balancing device: comprise one piece of E structure stable equilibrium block, one piece of E structure mobile balanced block and one piece of E structure diagonal slide plate, E structure stable equilibrium block is arranged on valve plate contiguous block away from valve plate one end, and it is parallel with valve plate face, near valve outlet port side, one piece of E structure diagonal slide plate is installed at E structure stable equilibrium block, the lower end of E structure diagonal slide plate is fixedly connected with valve plate contiguous block, upper end has the upper end of a bent plate and E structure stable equilibrium block to be fixedly linked, E structure diagonal slide plate and E structure stable equilibrium block have angle δ, 3 °≤δ≤25 °, a banded hole matched with E structure diagonal slide plate width and thickness is had in E structure mobile balanced block, this banded borehole jack to be contained on E structure diagonal slide plate and can to slide on E structure diagonal slide plate, there is multiple screw hole E structure mobile balanced block side, screw of screwing on withstands on E structure diagonal slide plate and fixes E structure mobile balanced block, regulate the position of E structure mobile balanced block on E structure diagonal slide plate and screw of screwing on withstands on E structure diagonal slide plate and fixes, E structure valve plate counterweight balancing device is made to be slightly less than the leverage of valve plate relative to valve plate rotating shaft relative to the leverage of valve plate rotating shaft, thus make valve plate all have a leverage that valve plate can be made to be returned to closed condition in any opening state, because the leverage relative to valve plate rotating shaft that the leverage of this return action produces much smaller than valve plate in valve plate opening process, therefore, this safety check is very energy-conservation, the check valve body structural modification of E structure valve plate counterweight balancing device is less, the space on the upside of by valve plate is only had to strengthen, thus make E structure valve plate counterweight balancing device have the space that can rotate 0 ° ~ 90 ° with the opening and closing of valve plate around valve plate rotating shaft, simultaneously the upper flange of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange and outlet(discharge) flange are constant.
3, in the structure of existing safety check, only add a counter weight device that can automatically regulate to valve plate, so except increasing except the space of valve plate counter weight device activity to valve body, do not need the Change In Design doing other, the mounting flange spacing comprising safety check is constant, is convenient to like this change to existing safety check install.
The present invention compared with prior art has the following advantages:
1. after safety check is opened gradually by fluid impact, valve plate is in a stable open mode, and no longer need the impact force by fluid to stablize to open valve plate to keep the opening state of safety check, and valve plate is in opening procedure gradually, the mobile lever balance regulating balancing weight and valve plate of balancing weight, thus make valve plate in opening process, need the impact force of liquid or gas less all the time, and then safety check is made all to have less resistance under any aperture state.
2. in the moment that the hydrodynamic pressure of valve entrance point disappears, pressure due to valve outlet port end does not also have enough time to disappear, so, overbottom pressure can be back in safety check immediately, thus energy auto impact valve plate, make natively have the unbalanced valve plate of certain lever to guarantee to be returned to the position of closure of check ring.
3. because the present invention only adds a counter weight device to valve plate, so except increasing except the space of valve plate Equilibrator activity to valve chamber, do not need the Change In Design doing other, namely the mounting flange spacing of safety check is constant, be convenient to like this change to existing safety check install, also can meet Standard preferably simultaneously.
Accompanying drawing explanation
Fig. 1 is the generalized section of A constructive embodiment of the present invention;
Fig. 2 is valve plate embodiment illustrated in fig. 1 and Equilibrator schematic diagram;
Fig. 3 is R-R schematic diagram embodiment illustrated in fig. 1;
Fig. 4 is the generalized section of B constructive embodiment of the present invention;
Fig. 5 is valve plate half-open position schematic diagram embodiment illustrated in fig. 4;
Fig. 6 is valve plate embodiment illustrated in fig. 4 and Equilibrator schematic diagram;
Fig. 7 is S-S schematic diagram embodiment illustrated in fig. 6;
Fig. 8 is P enlarged diagram embodiment illustrated in fig. 7;
Fig. 9 is the generalized section of C-structure embodiment of the present invention;
Figure 10 is valve plate half-open position schematic diagram embodiment illustrated in fig. 9;
Figure 11 is Q enlarged diagram embodiment illustrated in fig. 9;
Figure 12 is the generalized section of D constructive embodiment of the present invention;
Figure 13 is valve plate embodiment illustrated in fig. 12 and Equilibrator schematic diagram;
Figure 14 is T-T schematic diagram embodiment illustrated in fig. 13;
Figure 15 is the generalized section of E constructive embodiment of the present invention;
Figure 16 is valve plate embodiment illustrated in fig. 15 and Equilibrator schematic diagram.
In Fig. 1-16: 1, suction flange 2, valve import 3, valve body 4, valve plate inlet seal circle 5, valve plate 6, valve plate rotating shaft 7, A constitutional balance block 8, valve chamber 9, upper flange mouth 10, upper flange 11, valve outlet port 12, outlet(discharge) flange 13, flange screw 14, valve plate contiguous block 15, the main equilibrium block 16 of B structure, the secondary equilibrium block 17 of B structure, the secondary equilibrium block rotating shaft 18 of B structure, the secondary equilibrium block baffle plate 19 of B structure, pull bar 20, C-structure gravity block 21, C-structure cambered way 22, C-structure gravity block supporting axle 23, D structure arc equilibrium block 24, E structure stable equilibrium block 25, E structure mobile balanced block 26, E structure diagonal slide plate.
Embodiment
Install in the embodiment of safety check in the level shown in Fig. 1-16: the permanent micro-resistance safety check of interior mode, comprise and be mounted on can seal with valve plate inlet seal circle 4 and rotarily opening in valve body 3 and the valve plate 5 of closing and the valve plate counterweight balancing device be connected away from valve plate 5 side with valve plate contiguous block 14 in valve body 3 by a valve plate rotating shaft 6 and valve plate contiguous block 14, valve plate contiguous block 14 central authorities between valve plate counterweight balancing device and valve plate 5 are valve plate rotating shaft 6, it is characterized in that: its valve plate counterweight balancing device of safety check that level is installed has five kinds of structures: the cross section of its vertical valve plate 5 of valve plate counterweight balancing device is asymmetric fan-shaped A structure, the B structure that valve plate counterweight balancing device is made up of main equilibrium block and secondary equilibrium block, the C-structure that valve plate counterweight balancing device is made up of a cambered way and a gravity block, the cross section of its vertical valve plate 5 of valve plate counterweight balancing device is the D structure of banana arc, the E structure that valve plate counterweight balancing device is made up of stable equilibrium block and mobile balanced block, its valve plate counterweight balancing device structure of vertically arranged safety check its valve plate counterweight balancing device structure and the safety check that level is installed is identical, but the balance weight of valve plate counterweight balancing device is different.
Five kinds of structures of its valve plate counterweight balancing device of safety check that level is installed:
(1) A structure valve plate counterweight balancing device, the cross section comprising one piece of vertical valve plate 5 is asymmetric fan-shaped A constitutional balance block, A constitutional balance block 7 is arranged on valve plate contiguous block 14 away from valve plate 5 one end, the angle α that A constitutional balance block 7 forms towards side and valve plate 5 plane of valve import 2 side, the angle β formed towards side and valve plate 5 plane of valve outlet port 11 side than A constitutional balance block 7 is little 3 ° ~ and 15 °, and 0 °≤α≤20 °, 3 °≤β≤35 °, make valve plate 5 when plumbness and valve plate 5 are with valve plate inlet seal circle 4 phase sealing state, the fan section of A structure valve plate counterweight balancing device to the gravity of valve outlet port 11 side slightly larger than the gravity to valve import 2 side, thus make A structure valve plate counterweight balancing device can have a less power that valve plate 5 is pressed to valve plate inlet seal circle 4, and form certain sealing, also have two kinds of other structures in addition, one is α=0 °, β=0 °, but the center of gravity of this A structure valve plate counterweight balancing device is at valve plate 5 plane deflection valve outlet port 11 side 2mm ~ 100mm, two is that A structure valve plate counterweight balancing device compares near valve plate contiguous block 14 one end away from the large sector structure in valve plate contiguous block 14 one end, and the center of gravity meeting A structure valve plate counterweight balancing device is equally partial to valve outlet port 11 side 2mm ~ 100mm in valve plate 5 plane, when valve plate 5 is backed down certain angle by the atmospheric pressure of valve import 2 or hydraulic coupling, valve plate 5 and A structure valve plate counterweight balancing device form leverage, but this leverage does not reach balance, but still have the less valve plate 5 that can make to be returned to the leverage of closed condition, because the leverage relative to valve plate rotating shaft 6 that the leverage of this return action produces much smaller than valve plate 5 in valve plate 5 opening process, therefore, this safety check is very energy-conservation, check valve body 3 structural modification of A structure valve plate counterweight balancing device is less, the space on the upside of by valve plate 5 is only had to strengthen, thus make A structure valve plate counterweight balancing device have the space that can rotate 0 ° ~ 90 ° with the opening and closing of valve plate 5 around valve plate rotating shaft 6, simultaneously the upper flange 10 of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange 1 and outlet(discharge) flange 12 are constant.
(2) B structure valve plate counterweight balancing device, comprise one piece of main equilibrium block and one piece of secondary equilibrium block composition B structure valve plate counterweight balancing device, the main equilibrium block 15 of B structure and the secondary equilibrium block 16 of B structure are with being arranged on valve plate contiguous block 14 away from valve plate 5 one end, the main equilibrium block 15 of B structure is arranged on towards valve import 2 side, the secondary equilibrium block 16 of B structure is arranged on towards valve outlet port 11 side, the main equilibrium block 15 of B structure is fixedly connected with valve plate contiguous block 14, the secondary equilibrium block 16 of B structure is connected with valve plate contiguous block 14 by the secondary equilibrium block rotating shaft 17 of a B structure, the secondary equilibrium block 16 of B structure can do a low-angle rotation around the secondary equilibrium block rotating shaft 17 of B structure, 2 °≤≤ 15 °, namely after turning clockwise the angle of from the position being fitted in the main equilibrium block 15 of B structure, be installed in the secondary equilibrium block baffle plate 18 of the B structure of valve plate contiguous block 14 near valve outlet port 11 side block and stop, when valve plate 5 is in plumbness and valve plate 5 is in closed condition, the main equilibrium block 15 of B structure and the secondary equilibrium block 16 of B structure, be positioned at the positive upside of valve plate 5, and the secondary equilibrium block 16 of B structure abuts in secondary equilibrium block baffle plate 18 position of B structure near secondary equilibrium block rotating shaft 17 position of B structure, namely now the secondary equilibrium block 16 of B structure is separated a maximum angle with the main equilibrium block of B structure 15: 2 ° ~ 15 °, when valve plate 5 is opened, along with valve plate 5 is around the increase of valve plate rotating shaft 6 rotated counterclockwise by angle, along with valve plate 5 is while valve plate rotating shaft 6 rotates, the secondary equilibrium block 16 of the main equilibrium block 15 of B structure and B structure does and being rotated counterclockwise of valve plate 5 same angular velocity around valve plate rotating shaft 6, and when valve plate 5 reaches around valve plate rotating shaft 6 rotated counterclockwise by angle the maximum angle that the secondary equilibrium block 16 of B structure is separated with the main equilibrium block 15 of B structure, namely when the focus point of the secondary equilibrium block 16 of B structure crosses the vertical line of valve plate rotating shaft 6 central point, the secondary equilibrium block 16 of B structure under gravity, be rotated counterclockwise the position that equilibrium block 15 main with B structure overlaps fast, and then being rotated counterclockwise of same angular velocity is done with valve plate 5 around valve plate rotating shaft 6 together with the main equilibrium block of B structure 15, until valve plate 5 is opened to maximum opening angle, in valve plate 5 closing process, when the valve plate 5 being opened to maximum position is progressively closed, valve plate 5 does clockwise direction and rotates, the main equilibrium block 15 of B structure and the secondary equilibrium block 16 of B structure do around valve plate rotating shaft 6 and rotate with angular velocity with valve plate 5, when the secondary equilibrium block 16 of B structure crosses the vertical line of valve plate rotating shaft 6 central point around the focus point that valve plate rotating shaft 6 rotates to the secondary equilibrium block 16 of B structure, the secondary equilibrium block 16 of B structure is rotating simultaneously around valve plate rotating shaft 6, rotate to around the secondary equilibrium block rotating shaft 17 of B structure at once under gravity and blocked by the secondary equilibrium block baffle plate 18 of B structure, then continue the dextrorotation with valve plate 5 then rotate around valve plate rotating shaft 6, until valve plate 5 is closed completely, when valve plate 5 is when plumbness and valve plate 5 are with valve plate inlet seal circle 4 phase sealing state, the main equilibrium block of B structure 15 is directly over vertical valve plate 5, then maximum with the main equilibrium block 15 one-tenth of B structure one 2 ° ~ 15 ° angles of the secondary equilibrium block 16 of B structure tilt to valve outlet port 11 direction, now the secondary equilibrium block 16 of the main equilibrium block 15 of B structure and B structure forms gravity to valve outlet port 11 side slightly larger than the gravity to valve import 2 side, thus make B structure valve plate counterweight balancing device can have a less power that valve plate 5 is pressed to valve plate inlet seal circle 4, and form certain sealing, when valve plate 5 is backed down certain angle by the atmospheric pressure of valve import 2 or hydraulic coupling, valve plate 5 and B structure valve plate counterweight balancing device form leverage, but this leverage does not reach balance, but still have the less valve plate 5 that can make to be returned to the leverage of closed condition, because the leverage relative to valve plate rotating shaft 6 that the leverage of this return action produces much smaller than valve plate 5 in valve plate 5 opening process, therefore, this safety check is very energy-conservation, check valve body 3 structural modification of B structure valve plate counterweight balancing device is less, the space on the upside of by valve plate 5 is only had to strengthen, thus make B structure valve plate counterweight balancing device have the space that can rotate 0 ° ~ 90 ° with the opening and closing of valve plate 5 around valve plate rotating shaft 6, simultaneously the upper flange 10 of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange 1 and outlet(discharge) flange 12 are constant.
(3) C-structure valve plate counterweight balancing device, comprise a C-structure cambered way 21, one piece of C-structure gravity block 20 and a pull bar 19, C-structure cambered way 21 is fixedly mounted on valve plate contiguous block 14 away from valve plate 5 one end, the jointing of C-structure cambered way 21 and valve plate contiguous block 14 is perpendicular to valve plate contiguous block 14, the arc of C-structure cambered way 21 epimere bends towards valve outlet port 11, a slideway is had in the middle of C-structure cambered way 21, a C-structure gravity block supporting axle 22 is passed in the position that the central authorities of C-structure gravity block 20 are on the upper side, what supporting axle can rotate to make gravity block in cambered way moving process, keep gravity block in gravity block naturally droops state, the two ends of C-structure gravity block supporting axle 22 are stuck on C-structure cambered way 21 can move along cambered way, C-structure gravity block supporting axle 22 is respectively connected with a pull bar 19 through the two ends after C-structure cambered way 21, the other end of two pull bars 19 is connected to both sides, stage casing, C-structure valve plate counterweight balancing device rotary moveable region, valve import 2 sections top, with valve plate rotating shaft 6 in same level position but distance valve plate rotating shaft 6 is the position of 30mm ~ 500 mm, the joint, two ends of two pull bars 19 is axle and connects, and all can rotate around coupling shaft, when valve plate 5 is progressively opened and is rotated counterclockwise around valve plate rotating shaft 6, drive and valve plate 5 do same angular velocity by the C-structure cambered way 21 that valve plate contiguous block 14 is fixedly linked and rotate, due to the effect of two pull bars 19, while C-structure cambered way 21 does the rotation of same angular velocity, C-structure gravity block 20 is pushed to C-structure cambered way 21 and is moved away from valve plate contiguous block 14 direction by two pull bars 19, thus constantly increase the leverage of C-structure gravity block 20 relative to valve plate rotating shaft 6, but along with valve plate 5 opens the increase doing rotated counterclockwise by angle, valve plate 5 also constantly increases relative to the leverage of valve plate rotating shaft 6, ever-increasing C-structure gravity block 20 is made to be slightly less than the leverage of valve plate 5 relative to valve plate rotating shaft 6 of constantly increase all the time relative to the leverage of valve plate rotating shaft 6, thus make valve plate 5 under any opening state, have the less valve plate 5 that can make to be in the active force being returned to closed condition position all the time, because the leverage relative to valve plate rotating shaft 6 that the leverage of this return action produces much smaller than valve plate 5 in valve plate 5 opening process, therefore, this safety check is very energy-conservation, check valve body 3 structural modification of C-structure valve plate counterweight balancing device is less, the space on the upside of by valve plate 5 is only had to strengthen, thus make C-structure valve plate counterweight balancing device have the space that can rotate 0 ° ~ 90 ° with the opening and closing of valve plate 5 around valve plate rotating shaft 6, simultaneously the upper flange 10 of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange 1 and outlet(discharge) flange 12 are constant.
(4) D structure valve plate counterweight balancing device, the cross section comprising one piece of vertical valve plate 5 is the D structure arc equilibrium block 23 of banana arc, D structure arc equilibrium block 23 is arranged on valve plate contiguous block 14 away from valve plate 5 one end, D structure arc equilibrium block 23 has a banana arc to bend towards valve outlet port 11, make when valve plate 5 plumbness and valve plate 5 are with valve plate inlet seal circle 4 phase sealing state, the center of gravity of D structure arc equilibrium block 23 moves apart valve plate 5 central axis, 5 mm ~ 50mm are offset to valve outlet port 11, thus make valve plate 5 when plumbness and valve plate 5 are with valve plate inlet seal circle 4 phase sealing state, can there is a less power that valve plate 5 is pressed to valve plate inlet seal circle 4, and form certain sealing, when valve plate 5 is backed down certain angle by the atmospheric pressure of valve import 2 or hydraulic coupling, valve plate 5 and D structure valve plate counterweight balancing device form leverage, but this leverage does not reach balance, but still have the less valve plate 5 that can make to be returned to the leverage of closed condition, because the leverage relative to valve plate rotating shaft 6 that the leverage of this return action produces much smaller than valve plate 5 in valve plate 5 opening process, therefore, this safety check is very energy-conservation, check valve body 3 structural modification of D structure valve plate counterweight balancing device is less, the space on the upside of by valve plate 5 is only had to strengthen, thus make D structure valve plate counterweight balancing device have the space that can rotate 0 ° ~ 90 ° with the opening and closing of valve plate 5 around valve plate rotating shaft 6, simultaneously the upper flange 10 of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange 1 and outlet(discharge) flange 12 are constant.
(5) E structure valve plate counterweight balancing device: comprise one piece of E structure stable equilibrium block 24, one piece of E structure mobile balanced block 25 and one piece of E structure diagonal slide plate 26, E structure stable equilibrium block 24 is arranged on valve plate contiguous block 14 away from valve plate 5 one end, and it is parallel with valve plate 5, near valve outlet port 11 side, one piece of E structure diagonal slide plate 26 is installed at E structure stable equilibrium block 24, the lower end of E structure diagonal slide plate 26 is fixedly connected with valve plate contiguous block 14, upper end has the upper end of a bent plate and E structure stable equilibrium block 24 to be fixedly linked, E structure diagonal slide plate 26 and E structure stable equilibrium block 24 have angle δ, 3 °≤δ≤25 °, a banded hole matched with E structure diagonal slide plate 26 width and thickness is had in E structure mobile balanced block 25, this banded borehole jack to be contained on E structure diagonal slide plate 26 and can to slide on E structure diagonal slide plate 26, there is multiple screw hole E structure mobile balanced block 25 side, screw of screwing on withstands on E structure diagonal slide plate 26 and fixes E structure mobile balanced block 25, regulate the position of E structure mobile balanced block 25 on E structure diagonal slide plate 26 and screw of screwing on withstands on E structure diagonal slide plate 26 and fixes, E structure valve plate counterweight balancing device is made to be slightly less than the leverage of valve plate 5 relative to valve plate rotating shaft 6 relative to the leverage of valve plate rotating shaft 6, thus make valve plate 5 all have a leverage that valve plate 5 can be made to be returned to closed condition in any opening state, because the leverage relative to valve plate rotating shaft 6 that the leverage of this return action produces much smaller than valve plate 5 in valve plate 5 opening process, therefore, this safety check is very energy-conservation, check valve body 3 structural modification of E structure valve plate counterweight balancing device is less, the space on the upside of by valve plate 5 is only had to strengthen, thus make E structure valve plate counterweight balancing device have the space that can rotate 0 ° ~ 90 ° with the opening and closing of valve plate 5 around valve plate rotating shaft 6, simultaneously the upper flange 10 of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange 1 and outlet(discharge) flange 12 are constant.
In the structure of existing safety check, add a counter weight device that can automatically regulate only to valve plate 5, so except increasing except the space of valve plate 5 counter weight device activity to valve body 3, do not need the Change In Design doing other, the mounting flange spacing comprising safety check is constant, is convenient to like this change to existing safety check install.
Claims (1)
1. the permanent micro-resistance safety check of mode in, comprise and be mounted on can seal with valve plate inlet seal circle (4) and rotarily opening in valve body (3) and the valve plate of closing (5) and the valve plate counterweight balancing device that is connected away from valve plate (5) side with valve plate contiguous block (14) in valve body (3) by a valve plate rotating shaft (6) and valve plate contiguous block (14), valve plate contiguous block (14) central authorities between valve plate counterweight balancing device and valve plate (5) are valve plate rotating shaft (6), it is characterized in that: its valve plate counterweight balancing device of safety check that level is installed has five kinds of structures: the cross section in its vertical valve plate (5) face of valve plate counterweight balancing device is asymmetric fan-shaped A structure, the B structure that valve plate counterweight balancing device is made up of main equilibrium block and secondary equilibrium block, the C-structure that valve plate counterweight balancing device is made up of a cambered way and a gravity block, the cross section in its vertical valve plate (5) face of valve plate counterweight balancing device is the D structure of banana arc, the E structure that valve plate counterweight balancing device is made up of stable equilibrium block and mobile balanced block, its valve plate counterweight balancing device structure of vertically arranged safety check its valve plate counterweight balancing device structure and the safety check that level is installed is identical, but the balance weight of valve plate counterweight balancing device is different,
Five kinds of structures of its valve plate counterweight balancing device of safety check that level is installed:
(1) A structure valve plate counterweight balancing device, the cross section comprising one piece of vertical valve plate (5) face is asymmetric fan-shaped A constitutional balance block, A constitutional balance block (7) is arranged on valve plate contiguous block (14) away from valve plate (5) one end, the angle α that A constitutional balance block (7) forms towards side and valve plate (5) plane of valve import (2) side, the angle β formed towards side and valve plate (5) plane of valve outlet port (11) side than A constitutional balance block (7) is little 3 ° ~ and 15 °, and 0 °≤α≤20 °, 3 °≤β≤35 °, make valve plate (5) when plumbness and valve plate (5) are with valve plate inlet seal circle (4) phase sealing state, the fan section of A structure valve plate counterweight balancing device to the gravity of valve outlet port (11) side slightly larger than the gravity to valve import (2) side, thus make A structure valve plate counterweight balancing device can have a less power that valve plate (5) is pressed to valve plate inlet seal circle (4), and form certain sealing, A constitutional balance block also has two kinds of other structures in addition, one is α=0 °, β=0 °, but the center of gravity of this A structure valve plate counterweight balancing device is at valve plate (5) plane deflection valve outlet port (11) side 2mm ~ 100mm, two is that A structure valve plate counterweight balancing device compares near valve plate contiguous block (14) one end away from the large sector structure in valve plate contiguous block (14) one end, and the center of gravity meeting A structure valve plate counterweight balancing device is equally partial to valve outlet port (11) side 2mm ~ 100mm in valve plate (5) plane, when valve plate (5) is backed down certain angle by the atmospheric pressure of valve import (2) or hydraulic coupling, valve plate (5) and A structure valve plate counterweight balancing device form leverage, but this leverage does not reach balance, but still have the less valve plate (5) that can make to be returned to the leverage of closed condition, because the leverage relative to valve plate rotating shaft (6) that the leverage of this return action produces much smaller than valve plate (5) in valve plate (5) opening process, therefore, this safety check is very energy-conservation, check valve body (3) structural modification of A structure valve plate counterweight balancing device is less, only have and the space of valve plate (5) upside is strengthened, thus A structure valve plate counterweight balancing device is had can rotate the space of 0 ° ~ 90 ° with the opening and closing of valve plate (5) around valve plate rotating shaft (6), simultaneously the upper flange (10) of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange (1) and outlet(discharge) flange (12) are constant,
(2) B structure valve plate counterweight balancing device, comprise one piece of main equilibrium block and one piece of secondary equilibrium block composition B structure valve plate counterweight balancing device, the main equilibrium block of B structure (15) and the secondary equilibrium block (16) of B structure are with being arranged on valve plate contiguous block (14) away from valve plate (5) one end, the main equilibrium block of B structure (15) is arranged on towards valve import (2) side, the secondary equilibrium block (16) of B structure is arranged on towards valve outlet port (11) side, the main equilibrium block of B structure (15) is fixedly connected with valve plate contiguous block (14), the secondary equilibrium block (16) of B structure is connected with valve plate contiguous block (14) by secondary equilibrium block rotating shaft (17) of a B structure, the secondary equilibrium block (16) of B structure can do a low-angle rotation around secondary equilibrium block rotating shaft (17) of B structure, 2 °≤≤ 15 °, namely after turning clockwise the angle of from the position being fitted in the main equilibrium block of B structure (15), be installed in secondary equilibrium block baffle plate (18) of the B structure of valve plate contiguous block (14) near valve outlet port (11) side block and stop, when valve plate (5) is in plumbness and valve plate (5) is in closed condition, the main equilibrium block of B structure (15) and the secondary equilibrium block (16) of B structure, be positioned at the positive upside of valve plate (5), and the secondary equilibrium block (16) of B structure abuts in secondary equilibrium block baffle plate (18) position of B structure near secondary equilibrium block rotating shaft (17) position of B structure, namely now the secondary equilibrium block (16) of B structure is separated a maximum angle with the main equilibrium block of B structure (15): 2 ° ~ 15 °, when valve plate (5) is opened, along with valve plate (5) is around the increase of valve plate rotating shaft (6) rotated counterclockwise by angle, along with valve plate (5) is while valve plate rotating shaft (6) rotates, the secondary equilibrium block (16) of the main equilibrium block of B structure (15) and B structure is done and being rotated counterclockwise of valve plate (5) same angular velocity around valve plate rotating shaft (6), and when valve plate (5) reaches around valve plate rotating shaft (6) rotated counterclockwise by angle the maximum angle that the secondary equilibrium block (16) of B structure is separated with the main equilibrium block of B structure (15), namely when the focus point of the secondary equilibrium block (16) of B structure crosses the vertical line of valve plate rotating shaft (6) central point, the secondary equilibrium block (16) of B structure under gravity, be rotated counterclockwise the position overlapped with the main equilibrium block of B structure (15) fast, and then being rotated counterclockwise of same angular velocity is done with valve plate (5) around valve plate rotating shaft (6) together with the main equilibrium block of B structure (15), until valve plate (5) is opened to maximum opening angle, in valve plate (5) closing process, when the valve plate (5) being opened to maximum position is progressively closed, valve plate (5) does clockwise direction and rotates, the main equilibrium block of B structure (15) and the secondary equilibrium block (16) of B structure are done around valve plate rotating shaft (6) and are rotated with angular velocity with valve plate (5), when the secondary equilibrium block (16) of B structure crosses the vertical line of valve plate rotating shaft (6) central point around the focus point that valve plate rotating shaft (6) rotates to the secondary equilibrium block (16) of B structure, the secondary equilibrium block (16) of B structure is rotating simultaneously around valve plate rotating shaft (6), rotate to around secondary equilibrium block rotating shaft (17) of B structure at once under gravity and blocked by secondary equilibrium block baffle plate (18) of B structure, then continue the dextrorotation with valve plate (5) then rotate around valve plate rotating shaft (6), until valve plate (5) is closed completely, when valve plate (5) is when plumbness and valve plate (5) are with valve plate inlet seal circle (4) phase sealing state, the main equilibrium block of B structure (15) is directly over vertical valve plate (5), the secondary equilibrium block of B structure (16) then becomes maximum 2 ° ~ 15 ° angles to tilt to valve outlet port (11) direction with the main equilibrium block of B structure (15), now the secondary equilibrium block (16) of the main equilibrium block of B structure (15) and B structure forms gravity to valve outlet port (11) side slightly larger than the gravity to valve import (2) side, thus make B structure valve plate counterweight balancing device can have a less power that valve plate (5) is pressed to valve plate inlet seal circle (4), and form certain sealing, when valve plate (5) is backed down certain angle by the atmospheric pressure of valve import (2) or hydraulic coupling, valve plate (5) and B structure valve plate counterweight balancing device form leverage, but this leverage does not reach balance, but still have the less valve plate (5) that can make to be returned to the leverage of closed condition, because the leverage relative to valve plate rotating shaft (6) that the leverage of this return action produces much smaller than valve plate (5) in valve plate (5) opening process, therefore, this safety check is very energy-conservation, check valve body (3) structural modification of B structure valve plate counterweight balancing device is less, only have and the space of valve plate (5) upside is strengthened, thus B structure valve plate counterweight balancing device is had can rotate the space of 0 ° ~ 90 ° with the opening and closing of valve plate (5) around valve plate rotating shaft (6), simultaneously the upper flange (10) of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange (1) and outlet(discharge) flange (12) are constant,
(3) C-structure valve plate counterweight balancing device, comprise a C-structure cambered way (21), one piece of C-structure gravity block (20) and a pull bar (19), C-structure cambered way (21) is fixedly mounted on valve plate contiguous block (14) away from valve plate (5) one end, the jointing of C-structure cambered way (21) and valve plate contiguous block (14) is perpendicular to valve plate contiguous block (14), the arc of C-structure cambered way (21) epimere bends towards valve outlet port (11), a slideway is had in the middle of C-structure cambered way (21), a C-structure gravity block supporting axle (22) is passed in the position that the central authorities of C-structure gravity block (20) are on the upper side, what supporting axle can rotate to make gravity block in cambered way moving process, keep gravity block in gravity block naturally droops state, the two ends of C-structure gravity block supporting axle (22) are stuck on C-structure cambered way (21) can move along cambered way, C-structure gravity block supporting axle (22) is respectively connected with a pull bar (19) through the two ends after C-structure cambered way (21), the other end of two pull bars (19) is connected to both sides, stage casing, C-structure valve plate counterweight balancing device rotary moveable region above valve import (2) section, the position being 30mm ~ 500 mm in same level position but apart from valve plate rotating shaft (6) with valve plate rotating shaft (6), the joint, two ends of two pull bars (19) is axle and connects, and all can rotate around coupling shaft, when progressively opening when valve plate (5) and be rotated counterclockwise around valve plate rotating shaft (6), drive and valve plate (5) do same angular velocity by the C-structure cambered way (21) that valve plate contiguous block (14) is fixedly linked and rotate, due to the effect of two pull bars (19), while C-structure cambered way (21) does the rotation of same angular velocity, two pull bars (19) are pushed C-structure gravity block (20) to C-structure cambered way (21) and are moved away from valve plate contiguous block (14) direction, thus constantly increase the leverage of C-structure gravity block (20) relative to valve plate rotating shaft (6), but along with valve plate (5) opens the increase doing rotated counterclockwise by angle, valve plate (5) also constantly increases relative to the leverage of valve plate rotating shaft (6), ever-increasing C-structure gravity block (20) is made to be slightly less than the leverage of valve plate (5) relative to valve plate rotating shaft (6) of constantly increase all the time relative to the leverage of valve plate rotating shaft (6), thus make valve plate (5) under any opening state, have the less valve plate (5) that can make to be in the active force being returned to closed condition position all the time, because the leverage relative to valve plate rotating shaft (6) that the leverage of this return action produces much smaller than valve plate (5) in valve plate (5) opening process, therefore, this safety check is very energy-conservation, check valve body (3) structural modification of C-structure valve plate counterweight balancing device is less, only have and the space of valve plate (5) upside is strengthened, thus C-structure valve plate counterweight balancing device is had can rotate the space of 0 ° ~ 90 ° with the opening and closing of valve plate (5) around valve plate rotating shaft (6), simultaneously the upper flange (10) of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange (1) and outlet(discharge) flange (12) are constant,
(4) D structure valve plate counterweight balancing device, the cross section comprising one piece of vertical valve plate (5) face is D structure arc equilibrium block (23) of banana arc, D structure arc equilibrium block (23) is arranged on valve plate contiguous block (14) away from valve plate (5) one end, D structure arc equilibrium block (23) has a banana arc to bend towards valve outlet port (11), make when valve plate (5) plumbness and valve plate (5) are with valve plate inlet seal circle (4) phase sealing state, the center of gravity of D structure arc equilibrium block (23) moves apart valve plate (5) central axis, 5 mm ~ 50mm are offset to valve outlet port (11), thus make valve plate (5) when plumbness and valve plate (5) are with valve plate inlet seal circle (4) phase sealing state, can there is a less power that valve plate (5) is pressed to valve plate inlet seal circle (4), and form certain sealing, when valve plate (5) is backed down certain angle by the atmospheric pressure of valve import (2) or hydraulic coupling, valve plate (5) and D structure valve plate counterweight balancing device form leverage, but this leverage does not reach balance, but still have the less valve plate (5) that can make to be returned to the leverage of closed condition, because the leverage relative to valve plate rotating shaft (6) that the leverage of this return action produces much smaller than valve plate (5) in valve plate (5) opening process, therefore, this safety check is very energy-conservation, check valve body (3) structural modification of D structure valve plate counterweight balancing device is less, only have and the space of valve plate (5) upside is strengthened, thus D structure valve plate counterweight balancing device is had can rotate the space of 0 ° ~ 90 ° with the opening and closing of valve plate (5) around valve plate rotating shaft (6), simultaneously the upper flange (10) of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange (1) and outlet(discharge) flange (12) are constant,
(5) E structure valve plate counterweight balancing device: comprise one piece of E structure stable equilibrium block (24), one piece of E structure mobile balanced block (25) and one piece of E structure diagonal slide plate (26), E structure stable equilibrium block (24) is arranged on valve plate contiguous block (14) away from valve plate (5) one end, and it is parallel with valve plate (5) face, near valve outlet port (11) side, one piece of E structure diagonal slide plate (26) is installed in E structure stable equilibrium block (24), the lower end of E structure diagonal slide plate (26) is fixedly connected with valve plate contiguous block (14), upper end has the upper end of a bent plate and E structure stable equilibrium block (24) to be fixedly linked, E structure diagonal slide plate (26) and E structure stable equilibrium block (24) have angle δ, 3 °≤δ≤25 °, a banded hole matched with E structure diagonal slide plate (26) width and thickness is had in E structure mobile balanced block (25), this banded borehole jack is contained in E structure diagonal slide plate (26) and goes up and above can slide at E structure diagonal slide plate (26), there is multiple screw hole E structure mobile balanced block (25) side, screw of screwing on withstands on E structure diagonal slide plate (26) and fixes E structure mobile balanced block (25), regulate E structure mobile balanced block (25) position on E structure diagonal slide plate (26) and screw of screwing on withstands on E structure diagonal slide plate (26) and fixes, E structure valve plate counterweight balancing device is made to be slightly less than the leverage of valve plate (5) relative to valve plate rotating shaft (6) relative to the leverage of valve plate rotating shaft (6), thus make valve plate (5) all have a leverage that valve plate (5) can be made to be returned to closed condition in any opening state, because the leverage relative to valve plate rotating shaft (6) that the leverage of this return action produces much smaller than valve plate (5) in valve plate (5) opening process, therefore, this safety check is very energy-conservation, check valve body (3) structural modification of E structure valve plate counterweight balancing device is less, only have and the space of valve plate (5) upside is strengthened, thus E structure valve plate counterweight balancing device is had can rotate the space of 0 ° ~ 90 ° with the opening and closing of valve plate (5) around valve plate rotating shaft (6), simultaneously the upper flange (10) of safety check also have 30mm ~ 200 mm on move, spacing and the alignment thereof of suction flange (1) and outlet(discharge) flange (12) are constant.
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