The box-like sealing configuration of valve sets and method thereof
Technical field
The present invention relates to the box-like sealing configuration of a kind of valve sets and method thereof, particularly for the sealing of double valve plates gate valve.
Background technique
Sealing is good Yu the bad major criterion of gate valve.In order to prevent being entered cylinder by the medium of choked flow along valve pull bar, cause corrosion and the obstruction of cylinder interior, thereby affect the normal use of gate valve, therefore, gate valve must be accomplished good sealing.
Conventionally, the sealing of gate valve is realized by seal ring and valve pull bar interference fit, but this encapsulating method is under the operating mode of high temperature, high-pressure medium, be easy to cause dielectric leakage and cause seal failure, and need to often change seal ring, make the maintenance cost of gate valve increase, these problems are perplexing user always.
Summary of the invention
the object of the invention is to overcome the deficiencies in the prior art, the box-like sealing configuration of valve sets and method thereof are provided.
The box-like sealing configuration of a kind of valve sets comprises hold-down grid, filler pressing sleeve, four layers of packing, dust ring, coupling, seal ring, spring, central ring, valve seat, valve pull bar; Central ring is connected with coupling bolt, coupling and valve pull bar Spielpassung, valve seat is connected with central ring bolt, valve seat is connected with dust ring bolt, four layers of packing and valve pull bar interference fit, filler pressing sleeve and valve pull bar Spielpassung, hold-down grid and valve pull bar Spielpassung, spring empty set on valve pull bar, seal ring and valve pull bar interference fit.
The first layer of four layers of described packing and the 4th layer of employing carbon fiber packing, the second layer adopts teflon packing, and the 3rd layer adopts flexible graphite stuffing.
The box-like encapsulating method of valve sets of described structure is: the liquid of sealing, gas medium leak through dust ring, four layers of packing, seal ring successively along valve pull bar;
Dust ring is connected with valve seat bolt, and with valve pull bar interference fit, stop liquid, the gas medium of leakage, realize sealing for the first time; Hold-down grid and filler pressing sleeve compress four layers of packing, and due to the effect of expanding with heat and contract with cold, spring plays the effect that regulates impacting force, and four layers of packing stop with valve pull bar interference fit liquid, the gas medium that penetrates dust ring, realize for the second time and sealing; Seal ring and valve pull bar interference fit, stop the liquid, the gas medium that penetrate four layers of packing, realizes sealing for the third time; Conventionally this three leakage proof sealings, seal process is complete.
The effect of having a mind to that the present invention compared with prior art has is, not only intensity is high can to guarantee packing for sealing, heat-and corrosion-resistant, antiscour, and friction factor is low, and self-lubricating property is good, and there is very high flexibility, resilience and unsteady performance, the mixed fillers of Expanded graphite and teflon, has significantly improved anti-shearing, the tensility of packing, and is conducive to produce labyrinth effect.Being used in combination of four layers of packing and twice seal ring, has significantly improved the sealability of gate valve, and cylinder corrosion and stuck phenomenon greatly reduce, and have obviously increased the working life of gate valve, for user has saved maintenance cost greatly.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the box-like sealing configuration of valve sets;
In figure, hold-down grid 1, filler pressing sleeve 2, four layers of packing 3, dust ring 4, coupling 5, seal ring 6, spring 7, central ring 8, valve seat 9, valve pull bar 10.
Embodiment
As shown in Figure 1, the box-like sealing configuration of a kind of valve sets comprises hold-down grid 1, filler pressing sleeve 2, four layers of packing 3, dust ring 4, coupling 5, seal ring 6, spring 7, central ring 8, valve seat 9, valve pull bar 10; Central ring 8 is connected with coupling 5 bolts, coupling 5 and valve pull bar 10 Spielpassung, valve seat 9 is connected with central ring 8 bolts, valve seat 9 is connected with dust ring 4 bolts, four layers of packing 3 and valve pull bar 10 interference fit, filler pressing sleeve 2 and valve pull bar 10 Spielpassung, hold-down grid 1 and valve pull bar 10 Spielpassung, spring 7 empty sets on valve pull bar 10, seal ring 6 and valve pull bar 10 interference fit.
The first layer of four layers of described packing 3 and the 4th layer of employing carbon fiber packing, the second layer adopts teflon packing, and the 3rd layer adopts flexible graphite stuffing.
The box-like encapsulating method of valve sets of described structure is as follows:
Need the liquid, gas medium of sealing through dust ring 4, four layers of packing 3, seal ring 6, to leak successively along valve pull bar 10;
Dust ring 4 is connected with valve seat 9 bolts, and with valve pull bar 10 interference fit, stop liquid, the gas medium of leakage, realize sealing for the first time; Hold-down grid 1 and filler pressing sleeve 2 compress four layers of packing 3, and due to the effect of expanding with heat and contract with cold, spring 7 plays the effect that regulates impacting force, and four layers of packing 3 stop with valve pull bar 10 interference fit liquid, the gas medium that penetrates dust ring 4, realize sealing for the second time; Seal ring 6 and valve pull bar 10 interference fit, stop the liquid, the gas medium that penetrate four layers of packing 3, realizes sealing for the third time; Conventionally this three leakage proof sealings, realize the liquid of needs sealing, the sealing of gas medium.